portablegl.h

/*

PortableGL 0.93 MIT licensed software renderer that closely mirrors OpenGL 3.x
portablegl.com
robertwinkler.com

Do this:
    #define PORTABLEGL_IMPLEMENTATION
before you include this file in *one* C or C++ file to create the implementation.

If you plan on using your own 3D vector/matrix library rather than crsw_math
that is built into PortableGL and your names are the standard glsl vec[2-4],
mat[3-4] etc., define MANGLE_TYPES too before including portablegl to
prefix all those builtin types with glinternal_ to avoid the clash.

You can check all the C++ examples and demos, I use my C++ rsw_math library.

// i.e. it should look like this:
#include ...
#include ...
#include ...
// if required
#define MANGLE_TYPES

#define PORTABLEGL_IMPLEMENTATION
#include "portablegl.h"

I use my CVector library for various types in PortableGL so you *can* #define
CVEC_ASSERT, CVEC_MEMMOVE, and (mutually inclusive) CVEC_MALLOC, CVEC_REALLOC,
and CVEC_FREE before the #include to avoid using the standard library
versions.  However, currently, I use at least malloc, realloc, and memcpy in
PortableGL so doing so wouldn't actually avoid the standard library.  Creating
equivalent PortableGL macros (that would automagically apply to any internally
used cvectors) is a TODO I suppose.


QUICK NOTES:
    Primarily of interest to game/graphics developers and other people who
    just want to play with the graphics pipeline and don't need peak
    performance or the the entirety of OpenGL or Vulkan features.

    RGBA32 is the only currently supported format for textures

    Only GL_TEXTURE_MAG_FILTER is actually used internally but you can set the
    MIN_FILTER for a texture.

    8-bit per channel RGBA is the only supported format for the framebuffer
    You can specify the order using the masks in init_glContext. Technically it'd be relatively
    trivial to add support for other formats but for now we use a u32* to access the buffer.

Any PortableGL program has roughly this structure, with some things
possibly declared globally or passed around in function parameters
as needed:

    #define WIDTH 640
    #define HEIGHT 480

    // shaders are functions matching thise prototypes
    void smooth_vs(float* vs_output, void* vertex_attribs, Shader_Builtins* builtins, void* uniforms);
    void smooth_fs(float* fs_input, Shader_Builtins* builtins, void* uniforms);

    typedef struct My_Uniforms {
        mat4 mvp_mat;
        vec4 v_color;
    } My_Uniforms;

    u32* backbuf;
    glContext the_context;

    if (!init_glContext(&the_context, &backbuf, WIDTH, HEIGHT, 32, 0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000)) {
        puts("Failed to initialize glContext");
        exit(0);
    }
    set_glContext(&the_context);

    // interpolation is an array with an entry of SMOOTH, FLAT or
    // NOPERSPECTIVE for each float being interpolated between the
    // vertex and fragment shaders

    // the last parameter is whether the fragment shader writes to
    // gl_FragDepth or discard, but it's not currently used.  In the future I may
    // have a macro that enables early depth testing *if* that parameter is
    // false for a minor performance boost but canonicaly depth test happens
    // after frag shader (and scissoring)
    GLenum interpolation[4] = { SMOOTH, SMOOTH, SMOOTH, SMOOTH };
    GLuint myshader = pglCreateProgram(smooth_vs, smooth_fs, 4, interpolation, GL_FALSE);
    glUseProgram(myshader);

    My_Uniform the_uniforms;
    pglSetUniform(&the_uniforms);

    the_uniforms.v_color = Red; // not actually used, using per vert color
    memcpy(the_uniforms.mvp_mat, identity, sizeof(mat4));

    // Your standard OpenGL buffer setup etc. here
    // Like the compatibility profile, we allow/enable a default
    // VAO.  We also have a default shader program for the same reason,
    // something to fill index 0.
    // see implementation of init_glContext for details

    while (1) {

        // standard glDraw calls, switching shaders etc.

        // use backbuf however you want, whether that's blitting
        // it to some framebuffer in your GUI system, or even writing
        // it out to disk with something like stb_image_write.
    }

    free_glContext(&the_context);

    // compare with equivalent glsl below
    void smooth_vs(float* vs_output, void* vertex_attribs, Shader_Builtins* builtins, void* uniforms)
    {
        vec4* v_attribs = vertex_attribs;
        ((vec4*)vs_output)[0] = v_attribs[1]; //color

        builtins->gl_Position = mult_mat4_vec4(*((mat4*)uniforms), v_attribs[0]);
    }

    void smooth_fs(float* fs_input, Shader_Builtins* builtins, void* uniforms)
    {
        builtins->gl_FragColor = ((vec4*)fs_input)[0];
    }

    // note smooth is the default so this is the same as smooth out vec4 vary_color
    // https://www.khronos.org/opengl/wiki/Type_Qualifier_(GLSL)#Interpolation_qualifiers 
    uniform mvp_mat
    layout (location = 0) in vec4 in_vertex;
    layout (location = 1) in vec4 in_color;
    out vec4 vary_color;
    void main(void)
    {
        vary_color = in_color;
        gl_Position = mvp_mat * in_vertex;
    }

    in vec4 vary_color;
    out vec4 frag_color;
    void main(void)
    {
        frag_color = vary_color;
    }

That's basically it.  There are some other non-standard features like
pglSetInterp that lets you change the interpolation of a shader
whenever you want.  In real OpenGL you'd have to have 2 (or more) separate
but almost identical shaders to do that.

There are also these predefined maximums which, considering the performance
limitations of PortableGL, are probably more than enough.  MAX_DRAW_BUFFERS
isn't used since they're not currently supported anyway.

    #define MAX_VERTICES 500000
    #define GL_MAX_VERTEX_ATTRIBS 16
    #define GL_MAX_VERTEX_OUTPUT_COMPONENTS 64
    #define GL_MAX_DRAW_BUFFERS 8


MIT License
Copyright (c) 2011-2021 Robert Winkler

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN THE SOFTWARE.


Clipping code copyright (c) Fabrice Bellard from TinyGL
https://bellard.org/TinyGL/

 (C) 1997-1998 Fabrice Bellard

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product and its documentation 
     *is* required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.

If you redistribute modified sources, I would appreciate that you
include in the files history information documenting your changes.


*/

#ifdef MANGLE_TYPES
#define vec2 glinternal_vec2
#define vec3 glinternal_vec3
#define vec4 glinternal_vec4
#define dvec2 glinternal_dvec2
#define dvec3 glinternal_dvec3
#define dvec4 glinternal_dvec4
#define ivec2 glinternal_ivec2
#define ivec3 glinternal_ivec3
#define ivec4 glinternal_ivec4
#define uvec2 glinternal_uvec2
#define uvec3 glinternal_uvec3
#define uvec4 glinternal_uvec4
#define mat2 glinternal_mat2
#define mat3 glinternal_mat3
#define mat4 glinternal_mat4
#define Color glinternal_Color
#define Line glinternal_Line
#define Plane glinternal_Plane
#endif

#ifndef GL_H
#define GL_H


#ifdef __cplusplus
extern "C" {
#endif

#ifndef CRSW_MATH_H
#define CRSW_MATH_H

#include <math.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

#define RM_PI (3.14159265358979323846)
#define RM_2PI (2.0 * RM_PI)
#define PI_DIV_180 (0.017453292519943296)
#define INV_PI_DIV_180 (57.2957795130823229)

#define DEG_TO_RAD(x)   ((x)*PI_DIV_180)
#define RAD_TO_DEG(x)   ((x)*INV_PI_DIV_180)

/* Hour angles */
#define HR_TO_DEG(x)    ((x) * (1.0 / 15.0))
#define HR_TO_RAD(x)    DEG_TO_RAD(HR_TO_DEG(x))

#define DEG_TO_HR(x)    ((x) * 15.0)
#define RAD_TO_HR(x)    DEG_TO_HR(RAD_TO_DEG(x))

// TODO rename RM_MAX?  make proper inline functions?
#ifndef MAX
#define MAX(a, b)  ((a) > (b)) ? (a) : (b)
#endif
#ifndef MIN
#define MIN(a, b)  ((a) < (b)) ? (a) : (b)
#endif

#define MAP(X, A, B, C, D) (X-A)/(B-A) * (D-C) + C

typedef uint8_t  u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
typedef int8_t   i8;
typedef int16_t  i16;
typedef int32_t  i32;
typedef int64_t  i64;


inline float rsw_rand_float(float min, float max)
{
	return (rand()/((float)RAND_MAX-1))*(max-min) + min;
}

typedef struct vec2
{
	float x;
	float y;
} vec2;


typedef struct vec3
{
	float x;
	float y;
	float z;
} vec3;


typedef struct vec4
{
	float x;
	float y;
	float z;
	float w;
} vec4;

#define SET_VEC2(v, _x, _y) \
	do {\
	(v).x = _x;\
	(v).y = _y;\
	} while (0)

#define SET_VEC3(v, _x, _y, _z) \
	do {\
	(v).x = _x;\
	(v).y = _y;\
	(v).z = _z;\
	} while (0)

#define SET_VEC4(v, _x, _y, _z, _w) \
	do {\
	(v).x = _x;\
	(v).y = _y;\
	(v).z = _z;\
	(v).w = _w;\
	} while (0)

inline vec2 make_vec2(float x, float y)
{
	vec2 v = { x, y };
	return v;
}

inline vec3 make_vec3(float x, float y, float z)
{
	vec3 v = { x, y, z };
	return v;
}

inline vec4 make_vec4(float x, float y, float z, float w)
{
	vec4 v = { x, y, z, w };
	return v;
}

inline vec2 negate_vec2(vec2 v)
{
	vec2 r = { -v.x, -v.y };
	return r;
}

inline vec3 negate_vec3(vec3 v)
{
	vec3 r = { -v.x, -v.y, -v.z };
	return r;
}

inline vec4 negate_vec4(vec4 v)
{
	vec4 r = { -v.x, -v.y, -v.z, -v.w };
	return r;
}

inline void fprint_vec2(FILE* f, vec2 v, const char* append)
{
	fprintf(f, "(%f, %f)%s", v.x, v.y, append);
}

inline void fprint_vec3(FILE* f, vec3 v, const char* append)
{
	fprintf(f, "(%f, %f, %f)%s", v.x, v.y, v.z, append);
}

inline void fprint_vec4(FILE* f, vec4 v, const char* append)
{
	fprintf(f, "(%f, %f, %f, %f)%s", v.x, v.y, v.z, v.w, append);
}

inline void print_vec2(vec2 v, const char* append)
{
	printf("(%f, %f)%s", v.x, v.y, append);
}

inline void print_vec3(vec3 v, const char* append)
{
	printf("(%f, %f, %f)%s", v.x, v.y, v.z, append);
}

inline void print_vec4(vec4 v, const char* append)
{
	printf("(%f, %f, %f, %f)%s", v.x, v.y, v.z, v.w, append);
}

inline int fread_vec2(FILE* f, vec2* v)
{
	int tmp = fscanf(f, " (%f, %f)", &v->x, &v->y);
	return (tmp == 2);
}

inline int fread_vec3(FILE* f, vec3* v)
{
	int tmp = fscanf(f, " (%f, %f, %f)", &v->x, &v->y, &v->z);
	return (tmp == 3);
}

inline int fread_vec4(FILE* f, vec4* v)
{
	int tmp = fscanf(f, " (%f, %f, %f, %f)", &v->x, &v->y, &v->z, &v->w);
	return (tmp == 4);
}


typedef struct dvec2
{
	double x;
	double y;
} dvec2;


typedef struct dvec3
{
	double x;
	double y;
	double z;
} dvec3;


typedef struct dvec4
{
	double x;
	double y;
	double z;
	double w;
} dvec4;

inline void fprint_dvec2(FILE* f, dvec2 v, const char* append)
{
	fprintf(f, "(%f, %f)%s", v.x, v.y, append);
}

inline void fprint_dvec3(FILE* f, dvec3 v, const char* append)
{
	fprintf(f, "(%f, %f, %f)%s", v.x, v.y, v.z, append);
}

inline void fprint_dvec4(FILE* f, dvec4 v, const char* append)
{
	fprintf(f, "(%f, %f, %f, %f)%s", v.x, v.y, v.z, v.w, append);
}


inline int fread_dvec2(FILE* f, dvec2* v)
{
	int tmp = fscanf(f, " (%lf, %lf)", &v->x, &v->y);
	return (tmp == 2);
}

inline int fread_dvec3(FILE* f, dvec3* v)
{
	int tmp = fscanf(f, " (%lf, %lf, %lf)", &v->x, &v->y, &v->z);
	return (tmp == 3);
}

inline int fread_dvec4(FILE* f, dvec4* v)
{
	int tmp = fscanf(f, " (%lf, %lf, %lf, %lf)", &v->x, &v->y, &v->z, &v->w);
	return (tmp == 4);
}



typedef struct ivec2
{
	int x;
	int y;
} ivec2;


typedef struct ivec3
{
	int x;
	int y;
	int z;
} ivec3;


typedef struct ivec4
{
	int x;
	int y;
	int z;
	int w;
} ivec4;

inline ivec2 make_ivec2(int x, int y)
{
	ivec2 v = { x, y };
	return v;
}

inline ivec3 make_ivec3(int x, int y, int z)
{
	ivec3 v = { x, y, z };
	return v;
}

inline ivec4 make_ivec4(int x, int y, int z, int w)
{
	ivec4 v = { x, y, z, w };
	return v;
}

inline void fprint_ivec2(FILE* f, ivec2 v, const char* append)
{
	fprintf(f, "(%d, %d)%s", v.x, v.y, append);
}

inline void fprint_ivec3(FILE* f, ivec3 v, const char* append)
{
	fprintf(f, "(%d, %d, %d)%s", v.x, v.y, v.z, append);
}

inline void fprint_ivec4(FILE* f, ivec4 v, const char* append)
{
	fprintf(f, "(%d, %d, %d, %d)%s", v.x, v.y, v.z, v.w, append);
}

inline int fread_ivec2(FILE* f, ivec2* v)
{
	int tmp = fscanf(f, " (%d, %d)", &v->x, &v->y);
	return (tmp == 2);
}

inline int fread_ivec3(FILE* f, ivec3* v)
{
	int tmp = fscanf(f, " (%d, %d, %d)", &v->x, &v->y, &v->z);
	return (tmp == 3);
}

inline int fread_ivec4(FILE* f, ivec4* v)
{
	int tmp = fscanf(f, " (%d, %d, %d, %d)", &v->x, &v->y, &v->z, &v->w);
	return (tmp == 4);
}

typedef struct uvec2
{
	unsigned int x;
	unsigned int y;
} uvec2;


typedef struct uvec3
{
	unsigned int x;
	unsigned int y;
	unsigned int z;
} uvec3;


typedef struct uvec4
{
	unsigned int x;
	unsigned int y;
	unsigned int z;
	unsigned int w;
} uvec4;


inline void fprint_uvec2(FILE* f, uvec2 v, const char* append)
{
	fprintf(f, "(%u, %u)%s", v.x, v.y, append);
}

inline void fprint_uvec3(FILE* f, uvec3 v, const char* append)
{
	fprintf(f, "(%u, %u, %u)%s", v.x, v.y, v.z, append);
}

inline void fprint_uvec4(FILE* f, uvec4 v, const char* append)
{
	fprintf(f, "(%u, %u, %u, %u)%s", v.x, v.y, v.z, v.w, append);
}


inline int fread_uvec2(FILE* f, uvec2* v)
{
	int tmp = fscanf(f, " (%u, %u)", &v->x, &v->y);
	return (tmp == 2);
}

inline int fread_uvec3(FILE* f, uvec3* v)
{
	int tmp = fscanf(f, " (%u, %u, %u)", &v->x, &v->y, &v->z);
	return (tmp == 3);
}

inline int fread_uvec4(FILE* f, uvec4* v)
{
	int tmp = fscanf(f, " (%u, %u, %u, %u)", &v->x, &v->y, &v->z, &v->w);
	return (tmp == 4);
}






inline float length_vec2(vec2 a)
{
	return sqrt(a.x * a.x + a.y * a.y);
}

inline float length_vec3(vec3 a)
{
	return sqrt(a.x * a.x + a.y * a.y + a.z * a.z);
}


inline vec2 norm_vec2(vec2 a)
{
	float l = length_vec2(a);
	vec2 c = { a.x/l, a.y/l };
	return c;
}

inline vec3 norm_vec3(vec3 a)
{
	float l = length_vec3(a);
	vec3 c = { a.x/l, a.y/l, a.z/l };
	return c;
}

inline void normalize_vec2(vec2* a)
{
	float l = length_vec2(*a);
	a->x /= l;
	a->y /= l;
}

inline void normalize_vec3(vec3* a)
{
	float l = length_vec3(*a);
	a->x /= l;
	a->y /= l;
	a->z /= l;
}

inline vec2 add_vec2s(vec2 a, vec2 b)
{
	vec2 c = { a.x + b.x, a.y + b.y };
	return c;
}

inline vec3 add_vec3s(vec3 a, vec3 b)
{
	vec3 c = { a.x + b.x, a.y + b.y, a.z + b.z };
	return c;
}

inline vec4 add_vec4s(vec4 a, vec4 b)
{
	vec4 c = { a.x + b.x, a.y + b.y, a.z + b.z, a.w + b.w };
	return c;
}

inline vec2 sub_vec2s(vec2 a, vec2 b)
{
	vec2 c = { a.x - b.x, a.y - b.y };
	return c;
}

inline vec3 sub_vec3s(vec3 a, vec3 b)
{
	vec3 c = { a.x - b.x, a.y - b.y, a.z - b.z };
	return c;
}

inline vec4 sub_vec4s(vec4 a, vec4 b)
{
	vec4 c = { a.x - b.x, a.y - b.y, a.z - b.z, a.w - b.w };
	return c;
}

inline vec2 mult_vec2s(vec2 a, vec2 b)
{
	vec2 c = { a.x * b.x, a.y * b.y };
	return c;
}

inline vec3 mult_vec3s(vec3 a, vec3 b)
{
	vec3 c = { a.x * b.x, a.y * b.y, a.z * b.z };
	return c;
}

inline vec4 mult_vec4s(vec4 a, vec4 b)
{
	vec4 c = { a.x * b.x, a.y * b.y, a.z * b.z, a.w * b.w };
	return c;
}

inline vec2 div_vec2s(vec2 a, vec2 b)
{
	vec2 c = { a.x / b.x, a.y / b.y };
	return c;
}

inline vec3 div_vec3s(vec3 a, vec3 b)
{
	vec3 c = { a.x / b.x, a.y / b.y, a.z / b.z };
	return c;
}

inline vec4 div_vec4s(vec4 a, vec4 b)
{
	vec4 c = { a.x / b.x, a.y / b.y, a.z / b.z, a.w / b.w };
	return c;
}

inline float dot_vec2s(vec2 a, vec2 b)
{
	return a.x*b.x + a.y*b.y;
}

inline float dot_vec3s(vec3 a, vec3 b)
{
	return a.x * b.x + a.y * b.y + a.z * b.z;
}

inline float dot_vec4s(vec4 a, vec4 b)
{
	return a.x * b.x + a.y * b.y + a.z * b.z + a.w * b.w;
}

inline vec2 scale_vec2(vec2 a, float s)
{
	vec2 b = { a.x * s, a.y * s };
	return b;
}

inline vec3 scale_vec3(vec3 a, float s)
{
	vec3 b = { a.x * s, a.y * s, a.z * s };
	return b;
}

inline vec4 scale_vec4(vec4 a, float s)
{
	vec4 b = { a.x * s, a.y * s, a.z * s, a.w * s };
	return b;
}

inline int equal_vec2s(vec2 a, vec2 b)
{
	return (a.x == b.x && a.y == b.y);
}

inline int equal_vec3s(vec3 a, vec3 b)
{
	return (a.x == b.x && a.y == b.y && a.z == b.z);
}

inline int equal_vec4s(vec4 a, vec4 b)
{
	return (a.x == b.x && a.y == b.y && a.z == b.z && a.w == b.w);
}

inline int equal_epsilon_vec2s(vec2 a, vec2 b, float epsilon)
{
	return (fabs(a.x-b.x) < epsilon && fabs(a.y - b.y) < epsilon);
}

inline int equal_epsilon_vec3s(vec3 a, vec3 b, float epsilon)
{
	return (fabs(a.x-b.x) < epsilon && fabs(a.y - b.y) < epsilon &&
			fabs(a.z - b.z) < epsilon);
}

inline int equal_epsilon_vec4s(vec4 a, vec4 b, float epsilon)
{
	return (fabs(a.x-b.x) < epsilon && fabs(a.y - b.y) < epsilon &&
	        fabs(a.z - b.z) < epsilon && fabs(a.w - b.w) < epsilon);
}

inline vec2 vec4_to_vec2(vec4 a)
{
	vec2 v = { a.x, a.y };
	return v;
}

inline vec3 vec4_to_vec3(vec4 a)
{
	vec3 v = { a.x, a.y, a.z };
	return v;
}

inline vec2 vec4_to_vec2h(vec4 a)
{
	vec2 v = { a.x/a.w, a.y/a.w };
	return v;
}

inline vec3 vec4_to_vec3h(vec4 a)
{
	vec3 v = { a.x/a.w, a.y/a.w, a.z/a.w };
	return v;
}

inline vec3 cross_product(const vec3 u, const vec3 v)
{
	vec3 result;
	result.x = u.y*v.z - v.y*u.z;
	result.y = -u.x*v.z + v.x*u.z;
	result.z = u.x*v.y - v.x*u.y;
	return result;
}

inline float angle_between_vec3(const vec3 u, const vec3 v)
{
	return acos(dot_vec3s(u, v));
}



/* matrices **************/

typedef float mat2[4];
typedef float mat3[9];
typedef float mat4[16];

#define IDENTITY_MAT2() { 1, 0, 0, 1 }
#define IDENTITY_MAT3() { 1, 0, 0, 0, 1, 0, 0, 0, 1 }
#define IDENTITY_MAT4() { 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 }
#define SET_IDENTITY_MAT2(m) \
	do { \
	m[1] = m[2] = 0; \
	m[0] = m[3] = 1; \
	} while (0)

#define SET_IDENTITY_MAT3(m) \
	do { \
	memset(m, 0, sizeof(float)*9); \
	m[0] = m[4] = m[8] = 1; \
	} while (0)

#define SET_IDENTITY_MAT4(m) \
	do { \
	memset(m, 0, sizeof(float)*16); \
	m[0] = m[5] = m[10] = m[15] = 1; \
	} while (0)

#ifndef ROW_MAJOR
inline vec2 x_mat2(mat2 m) {  return make_vec2(m[0], m[2]); }
inline vec2 y_mat2(mat2 m) {  return make_vec2(m[1], m[3]); }
inline vec2 c1_mat2(mat2 m) { return make_vec2(m[0], m[1]); }
inline vec2 c2_mat2(mat2 m) { return make_vec2(m[2], m[3]); }

inline void setc1_mat2(mat2 m, vec2 v) { m[0]=v.x, m[1]=v.y; }
inline void setc2_mat2(mat2 m, vec2 v) { m[2]=v.x, m[3]=v.y; }

inline void setx_mat2(mat2 m, vec2 v) { m[0]=v.x, m[2]=v.y; }
inline void sety_mat2(mat2 m, vec2 v) { m[1]=v.x, m[3]=v.y; }
#else
inline vec2 x_mat2(mat2 m) {  return make_vec2(m[0], m[1]); }
inline vec2 y_mat2(mat2 m) {  return make_vec2(m[2], m[3]); }
inline vec2 c1_mat2(mat2 m) { return make_vec2(m[0], m[2]); }
inline vec2 c2_mat2(mat2 m) { return make_vec2(m[1], m[3]); }

inline void setc1_mat2(mat2 m, vec2 v) { m[0]=v.x, m[2]=v.y; }
inline void setc2_mat2(mat2 m, vec2 v) { m[1]=v.x, m[3]=v.y; }

inline void setx_mat2(mat2 m, vec2 v) { m[0]=v.x, m[1]=v.y; }
inline void sety_mat2(mat2 m, vec2 v) { m[2]=v.x, m[3]=v.y; }
#endif


#ifndef ROW_MAJOR
inline vec3 x_mat3(mat3 m) {  return make_vec3(m[0], m[3], m[6]); }
inline vec3 y_mat3(mat3 m) {  return make_vec3(m[1], m[4], m[7]); }
inline vec3 z_mat3(mat3 m) {  return make_vec3(m[2], m[5], m[8]); }
inline vec3 c1_mat3(mat3 m) { return make_vec3(m[0], m[1], m[2]); }
inline vec3 c2_mat3(mat3 m) { return make_vec3(m[3], m[4], m[5]); }
inline vec3 c3_mat3(mat3 m) { return make_vec3(m[6], m[7], m[8]); }

inline void setc1_mat3(mat3 m, vec3 v) { m[0]=v.x, m[1]=v.y, m[2]=v.z; }
inline void setc2_mat3(mat3 m, vec3 v) { m[3]=v.x, m[4]=v.y, m[5]=v.z; }
inline void setc3_mat3(mat3 m, vec3 v) { m[6]=v.x, m[7]=v.y, m[8]=v.z; }

inline void setx_mat3(mat3 m, vec3 v) { m[0]=v.x, m[3]=v.y, m[6]=v.z; }
inline void sety_mat3(mat3 m, vec3 v) { m[1]=v.x, m[4]=v.y, m[7]=v.z; }
inline void setz_mat3(mat3 m, vec3 v) { m[2]=v.x, m[5]=v.y, m[8]=v.z; }
#else
inline vec3 x_mat3(mat3 m) {  return make_vec3(m[0], m[1], m[2]); }
inline vec3 y_mat3(mat3 m) {  return make_vec3(m[3], m[4], m[5]); }
inline vec3 z_mat3(mat3 m) {  return make_vec3(m[6], m[7], m[8]); }
inline vec3 c1_mat3(mat3 m) { return make_vec3(m[0], m[3], m[6]); }
inline vec3 c2_mat3(mat3 m) { return make_vec3(m[1], m[4], m[7]); }
inline vec3 c3_mat3(mat3 m) { return make_vec3(m[2], m[5], m[8]); }

inline void setc1_mat3(mat3 m, vec3 v) { m[0]=v.x, m[3]=v.y, m[6]=v.z; }
inline void setc2_mat3(mat3 m, vec3 v) { m[1]=v.x, m[4]=v.y, m[7]=v.z; }
inline void setc3_mat3(mat3 m, vec3 v) { m[2]=v.x, m[5]=v.y, m[8]=v.z; }

inline void setx_mat3(mat3 m, vec3 v) { m[0]=v.x, m[1]=v.y, m[2]=v.z; }
inline void sety_mat3(mat3 m, vec3 v) { m[3]=v.x, m[4]=v.y, m[5]=v.z; }
inline void setz_mat3(mat3 m, vec3 v) { m[6]=v.x, m[7]=v.y, m[8]=v.z; }
#endif


#ifndef ROW_MAJOR
inline vec4 c1_mat4(mat4 m) { return make_vec4(m[ 0], m[ 1], m[ 2], m[ 3]); }
inline vec4 c2_mat4(mat4 m) { return make_vec4(m[ 4], m[ 5], m[ 6], m[ 7]); }
inline vec4 c3_mat4(mat4 m) { return make_vec4(m[ 8], m[ 9], m[10], m[11]); }
inline vec4 c4_mat4(mat4 m) { return make_vec4(m[12], m[13], m[14], m[15]); }

inline vec4 x_mat4(mat4 m) { return make_vec4(m[0], m[4], m[8], m[12]); }
inline vec4 y_mat4(mat4 m) { return make_vec4(m[1], m[5], m[9], m[13]); }
inline vec4 z_mat4(mat4 m) { return make_vec4(m[2], m[6], m[10], m[14]); }
inline vec4 w_mat4(mat4 m) { return make_vec4(m[3], m[7], m[11], m[15]); }

//sets 4th row to 0 0 0 1
inline void setc1_mat4v3(mat4 m, vec3 v) { m[ 0]=v.x, m[ 1]=v.y, m[ 2]=v.z, m[ 3]=0; }
inline void setc2_mat4v3(mat4 m, vec3 v) { m[ 4]=v.x, m[ 5]=v.y, m[ 6]=v.z, m[ 7]=0; }
inline void setc3_mat4v3(mat4 m, vec3 v) { m[ 8]=v.x, m[ 9]=v.y, m[10]=v.z, m[11]=0; }
inline void setc4_mat4v3(mat4 m, vec3 v) { m[12]=v.x, m[13]=v.y, m[14]=v.z, m[15]=1; }

inline void setc1_mat4v4(mat4 m, vec4 v) { m[ 0]=v.x, m[ 1]=v.y, m[ 2]=v.z, m[ 3]=v.w; }
inline void setc2_mat4v4(mat4 m, vec4 v) { m[ 4]=v.x, m[ 5]=v.y, m[ 6]=v.z, m[ 7]=v.w; }
inline void setc3_mat4v4(mat4 m, vec4 v) { m[ 8]=v.x, m[ 9]=v.y, m[10]=v.z, m[11]=v.w; }
inline void setc4_mat4v4(mat4 m, vec4 v) { m[12]=v.x, m[13]=v.y, m[14]=v.z, m[15]=v.w; }

//sets 4th column to 0 0 0 1
inline void setx_mat4v3(mat4 m, vec3 v) { m[0]=v.x, m[4]=v.y, m[ 8]=v.z, m[12]=0; }
inline void sety_mat4v3(mat4 m, vec3 v) { m[1]=v.x, m[5]=v.y, m[ 9]=v.z, m[13]=0; }
inline void setz_mat4v3(mat4 m, vec3 v) { m[2]=v.x, m[6]=v.y, m[10]=v.z, m[14]=0; }
inline void setw_mat4v3(mat4 m, vec3 v) { m[3]=v.x, m[7]=v.y, m[11]=v.z, m[15]=1; }

inline void setx_mat4v4(mat4 m, vec4 v) { m[0]=v.x, m[4]=v.y, m[ 8]=v.z, m[12]=v.w; }
inline void sety_mat4v4(mat4 m, vec4 v) { m[1]=v.x, m[5]=v.y, m[ 9]=v.z, m[13]=v.w; }
inline void setz_mat4v4(mat4 m, vec4 v) { m[2]=v.x, m[6]=v.y, m[10]=v.z, m[14]=v.w; }
inline void setw_mat4v4(mat4 m, vec4 v) { m[3]=v.x, m[7]=v.y, m[11]=v.z, m[15]=v.w; }
#else
inline vec4 c1_mat4(mat4 m) { return make_vec4(m[0], m[4], m[8], m[12]); }
inline vec4 c2_mat4(mat4 m) { return make_vec4(m[1], m[5], m[9], m[13]); }
inline vec4 c3_mat4(mat4 m) { return make_vec4(m[2], m[6], m[10], m[14]); }
inline vec4 c4_mat4(mat4 m) { return make_vec4(m[3], m[7], m[11], m[15]); }

inline vec4 x_mat4(mat4 m) { return make_vec4(m[0], m[1], m[2], m[3]); }
inline vec4 y_mat4(mat4 m) { return make_vec4(m[4], m[5], m[6], m[7]); }
inline vec4 z_mat4(mat4 m) { return make_vec4(m[8], m[9], m[10], m[11]); }
inline vec4 w_mat4(mat4 m) { return make_vec4(m[12], m[13], m[14], m[15]); }

//sets 4th row to 0 0 0 1
inline void setc1_mat4v3(mat4 m, vec3 v) { m[0]=v.x, m[4]=v.y, m[8]=v.z, m[12]=0; }
inline void setc2_mat4v3(mat4 m, vec3 v) { m[1]=v.x, m[5]=v.y, m[9]=v.z, m[13]=0; }
inline void setc3_mat4v3(mat4 m, vec3 v) { m[2]=v.x, m[6]=v.y, m[10]=v.z, m[14]=0; }
inline void setc4_mat4v3(mat4 m, vec3 v) { m[3]=v.x, m[7]=v.y, m[11]=v.z, m[15]=1; }

inline void setc1_mat4v4(mat4 m, vec4 v) { m[0]=v.x, m[4]=v.y, m[8]=v.z, m[12]=v.w; }
inline void setc2_mat4v4(mat4 m, vec4 v) { m[1]=v.x, m[5]=v.y, m[9]=v.z, m[13]=v.w; }
inline void setc3_mat4v4(mat4 m, vec4 v) { m[2]=v.x, m[6]=v.y, m[10]=v.z, m[14]=v.w; }
inline void setc4_mat4v4(mat4 m, vec4 v) { m[3]=v.x, m[7]=v.y, m[11]=v.z, m[15]=v.w; }

//sets 4th column to 0 0 0 1
inline void setx_mat4v3(mat4 m, vec3 v) { m[0]=v.x, m[1]=v.y, m[2]=v.z, m[3]=0; }
inline void sety_mat4v3(mat4 m, vec3 v) { m[4]=v.x, m[5]=v.y, m[6]=v.z, m[7]=0; }
inline void setz_mat4v3(mat4 m, vec3 v) { m[8]=v.x, m[9]=v.y, m[10]=v.z, m[11]=0; }
inline void setw_mat4v3(mat4 m, vec3 v) { m[12]=v.x, m[13]=v.y, m[14]=v.z, m[15]=1; }

inline void setx_mat4v4(mat4 m, vec4 v) { m[0]=v.x, m[1]=v.y, m[2]=v.z, m[3]=v.w; }
inline void sety_mat4v4(mat4 m, vec4 v) { m[4]=v.x, m[5]=v.y, m[6]=v.z, m[7]=v.w; }
inline void setz_mat4v4(mat4 m, vec4 v) { m[8]=v.x, m[9]=v.y, m[10]=v.z, m[11]=v.w; }
inline void setw_mat4v4(mat4 m, vec4 v) { m[12]=v.x, m[13]=v.y, m[14]=v.z, m[15]=v.w; }
#endif


inline void fprint_mat2(FILE* f, mat2 m, const char* append)
{
#ifndef ROW_MAJOR
	fprintf(f, "[(%f, %f)\n (%f, %f)]%s",
	        m[0], m[2], m[1], m[3], append);
#else
	fprintf(f, "[(%f, %f)\n (%f, %f)]%s",
	        m[0], m[1], m[2], m[3], append);
#endif
}


inline void fprint_mat3(FILE* f, mat3 m, const char* append)
{
#ifndef ROW_MAJOR
	fprintf(f, "[(%f, %f, %f)\n (%f, %f, %f)\n (%f, %f, %f)]%s",
	        m[0], m[3], m[6], m[1], m[4], m[7], m[2], m[5], m[8], append);
#else
	fprintf(f, "[(%f, %f, %f)\n (%f, %f, %f)\n (%f, %f, %f)]%s",
	        m[0], m[1], m[2], m[3], m[4], m[5], m[6], m[7], m[8], append);
#endif
}

inline void fprint_mat4(FILE* f, mat4 m, const char* append)
{
#ifndef ROW_MAJOR
	fprintf(f, "[(%f, %f, %f, %f)\n(%f, %f, %f, %f)\n(%f, %f, %f, %f)\n(%f, %f, %f, %f)]%s",
	        m[0], m[4], m[8], m[12], m[1], m[5], m[9], m[13], m[2], m[6], m[10], m[14],
	        m[3], m[7], m[11], m[15], append);
#else
	fprintf(f, "[(%f, %f, %f, %f)\n(%f, %f, %f, %f)\n(%f, %f, %f, %f)\n(%f, %f, %f, %f)]%s",
	        m[0], m[1], m[2], m[3], m[4], m[5], m[6], m[7], m[8], m[9], m[10], m[11],
	        m[12], m[13], m[14], m[15], append);
#endif
}

// macros?
inline void print_mat2(mat2 m, const char* append)
{
	fprint_mat2(stdout, m, append);
}

inline void print_mat3(mat3 m, const char* append)
{
	fprint_mat3(stdout, m, append);
}

inline void print_mat4(mat4 m, const char* append)
{
	fprint_mat4(stdout, m, append);
}



//TODO define macros for doing array version
inline vec2 mult_mat2_vec2(mat2 m, vec2 v)
{
	vec2 r;
#ifndef ROW_MAJOR
	r.x = m[0]*v.x + m[2]*v.y;
	r.y = m[1]*v.x + m[3]*v.y;
#else
	r.x = m[0]*v.x + m[1]*v.y;
	r.y = m[3]*v.x + m[3]*v.y;
#endif
	return r;
}


inline vec3 mult_mat3_vec3(mat3 m, vec3 v)
{
	vec3 r;
#ifndef ROW_MAJOR
	r.x = m[0]*v.x + m[3]*v.y + m[6]*v.z;
	r.y = m[1]*v.x + m[4]*v.y + m[7]*v.z;
	r.z = m[2]*v.x + m[5]*v.y + m[8]*v.z;
#else
	r.x = m[0]*v.x + m[1]*v.y + m[2]*v.z;
	r.y = m[3]*v.x + m[4]*v.y + m[5]*v.z;
	r.z = m[6]*v.x + m[7]*v.y + m[8]*v.z;
#endif
	return r;
}

inline vec4 mult_mat4_vec4(mat4 m, vec4 v)
{
	vec4 r;
#ifndef ROW_MAJOR
	r.x = m[0]*v.x + m[4]*v.y + m[8]*v.z + m[12]*v.w;
	r.y = m[1]*v.x + m[5]*v.y + m[9]*v.z + m[13]*v.w;
	r.z = m[2]*v.x + m[6]*v.y + m[10]*v.z + m[14]*v.w;
	r.w = m[3]*v.x + m[7]*v.y + m[11]*v.z + m[15]*v.w;
#else
	r.x = m[0]*v.x + m[1]*v.y + m[2]*v.z + m[3]*v.w;
	r.y = m[4]*v.x + m[5]*v.y + m[6]*v.z + m[7]*v.w;
	r.z = m[8]*v.x + m[9]*v.y + m[10]*v.z + m[11]*v.w;
	r.w = m[12]*v.x + m[13]*v.y + m[14]*v.z + m[15]*v.w;
#endif
	return r;
}


void mult_mat4_mat4(mat4 c, mat4 a, mat4 b);

void load_rotation_mat3(mat3 mat, vec3 v, float angle);

void load_rotation_mat4(mat4 mat, vec3 vec, float angle);

//void invert_mat4(mat4 mInverse, const mat4 m);

void make_perspective_matrix(mat4 mat, float fFov, float aspect, float near, float far);
void make_pers_matrix(mat4 mat, float z_near, float z_far);

void make_perspective_proj_matrix(mat4 mat, float left, float right, float bottom, float top, float near, float far);

void make_orthographic_matrix(mat4 mat, float left, float right, float bottom, float top, float near, float far);

void make_viewport_matrix(mat4 mat, int x, int y, unsigned int width, unsigned int height, int opengl);

void lookAt(mat4 mat, vec3 eye, vec3 center, vec3 up);



///////////Matrix transformation functions
inline void scale_mat3(mat3 m, float x, float y, float z)
{
#ifndef ROW_MAJOR
	m[0] = x; m[3] = 0; m[6] = 0;
	m[1] = 0; m[4] = y; m[7] = 0;
	m[2] = 0; m[5] = 0; m[8] = z;
#else
	m[0] = x; m[1] = 0; m[2] = 0;
	m[3] = 0; m[4] = y; m[5] = 0;
	m[6] = 0; m[7] = 0; m[8] = z;
#endif
}

inline void scale_mat4(mat4 m, float x, float y, float z)
{
#ifndef ROW_MAJOR
	m[ 0] = x; m[ 4] = 0; m[ 8] = 0; m[12] = 0;
	m[ 1] = 0; m[ 5] = y; m[ 9] = 0; m[13] = 0;
	m[ 2] = 0; m[ 6] = 0; m[10] = z; m[14] = 0;
	m[ 3] = 0; m[ 7] = 0; m[11] = 0; m[15] = 1;
#else
	m[ 0] = x; m[ 1] = 0; m[ 2] = 0; m[ 3] = 0;
	m[ 4] = 0; m[ 5] = y; m[ 6] = 0; m[ 7] = 0;
	m[ 8] = 0; m[ 9] = 0; m[10] = z; m[11] = 0;
	m[12] = 0; m[13] = 0; m[14] = 0; m[15] = 1;
#endif
}

// Create a Translation matrix. Only 4x4 matrices have translation components
inline void translation_mat4(mat4 m, float x, float y, float z)
{
#ifndef ROW_MAJOR
	m[ 0] = 1; m[ 4] = 0; m[ 8] = 0; m[12] = x;
	m[ 1] = 0; m[ 5] = 1; m[ 9] = 0; m[13] = y;
	m[ 2] = 0; m[ 6] = 0; m[10] = 1; m[14] = z;
	m[ 3] = 0; m[ 7] = 0; m[11] = 0; m[15] = 1;
#else
	m[ 0] = 1; m[ 1] = 0; m[ 2] = 0; m[ 3] = x;
	m[ 4] = 0; m[ 5] = 1; m[ 6] = 0; m[ 7] = y;
	m[ 8] = 0; m[ 9] = 0; m[10] = 1; m[11] = z;
	m[12] = 0; m[13] = 0; m[14] = 0; m[15] = 1;
#endif
}





// Extract a rotation matrix from a 4x4 matrix
// Extracts the rotation matrix (3x3) from a 4x4 matrix
//
#ifndef ROW_MAJOR
#define M44(m, row, col) m[col*4 + row]
#define M33(m, row, col) m[col*3 + row]
#else
#define M44(m, row, col) m[row*4 + col]
#define M33(m, row, col) m[row*3 + col]
#endif
inline void extract_rotation_mat4(mat3 dst, mat4 src, int normalize)
{
	vec3 tmp;
	if (normalize) {
		tmp.x = M44(src, 0, 0);
		tmp.y = M44(src, 1, 0);
		tmp.z = M44(src, 2, 0);
		normalize_vec3(&tmp);

		M33(dst, 0, 0) = tmp.x;
		M33(dst, 1, 0) = tmp.y;
		M33(dst, 2, 0) = tmp.z;

		tmp.x = M44(src, 0, 1);
		tmp.y = M44(src, 1, 1);
		tmp.z = M44(src, 2, 1);
		normalize_vec3(&tmp);

		M33(dst, 0, 1) = tmp.x;
		M33(dst, 1, 1) = tmp.y;
		M33(dst, 2, 1) = tmp.z;

		tmp.x = M44(src, 0, 2);
		tmp.y = M44(src, 1, 2);
		tmp.z = M44(src, 2, 2);
		normalize_vec3(&tmp);

		M33(dst, 0, 2) = tmp.x;
		M33(dst, 1, 2) = tmp.y;
		M33(dst, 2, 2) = tmp.z;
	} else {
		M33(dst, 0, 0) = M44(src, 0, 0);
		M33(dst, 1, 0) = M44(src, 1, 0);
		M33(dst, 2, 0) = M44(src, 2, 0);

		M33(dst, 0, 1) = M44(src, 0, 1);
		M33(dst, 1, 1) = M44(src, 1, 1);
		M33(dst, 2, 1) = M44(src, 2, 1);

		M33(dst, 0, 2) = M44(src, 0, 2);
		M33(dst, 1, 2) = M44(src, 1, 2);
		M33(dst, 2, 2) = M44(src, 2, 2);
	}
}
#undef M33
#undef M44


#ifndef EXCLUDE_GLSL
// GLSL functions
//
static inline float clamp_01(float f)
{
	if (f < 0.0f) return 0.0f;
	if (f > 1.0f) return 1.0f;
	return f;
}

static inline float clamp(float x, float minVal, float maxVal)
{
	if (x < minVal) return minVal;
	if (x > maxVal) return maxVal;
	return x;
}


#define PGL_VECTORIZE2_VEC(func) \
inline vec2 func##_vec2(vec2 v) \
{ \
	return make_vec2(func(v.x), func(v.y)); \
}
#define PGL_VECTORIZE3_VEC(func) \
inline vec3 func##_vec3(vec3 v) \
{ \
	return make_vec3(func(v.x), func(v.y), func(v.z)); \
}
#define PGL_VECTORIZE4_VEC(func) \
inline vec4 func##_vec4(vec4 v) \
{ \
	return make_vec4(func(v.x), func(v.y), func(v.z), func(v.w)); \
}

#define PGL_VECTORIZE_VEC(func) \
	PGL_VECTORIZE2_VEC(func) \
	PGL_VECTORIZE3_VEC(func) \
	PGL_VECTORIZE4_VEC(func)

#define PGL_STATIC_VECTORIZE2_VEC(func) \
static inline vec2 func##_vec2(vec2 v) \
{ \
	return make_vec2(func(v.x), func(v.y)); \
}
#define PGL_STATIC_VECTORIZE3_VEC(func) \
static inline vec3 func##_vec3(vec3 v) \
{ \
	return make_vec3(func(v.x), func(v.y), func(v.z)); \
}
#define PGL_STATIC_VECTORIZE4_VEC(func) \
static inline vec4 func##_vec4(vec4 v) \
{ \
	return make_vec4(func(v.x), func(v.y), func(v.z), func(v.w)); \
}

#define PGL_STATIC_VECTORIZE_VEC(func) \
	PGL_STATIC_VECTORIZE2_VEC(func) \
	PGL_STATIC_VECTORIZE3_VEC(func) \
	PGL_STATIC_VECTORIZE4_VEC(func)

static inline vec2 clamp_vec2(vec2 x, float minVal, float maxVal)
{
	return make_vec2(clamp(x.x, minVal, maxVal), clamp(x.y, minVal, maxVal));
}
static inline vec3 clamp_vec3(vec3 x, float minVal, float maxVal)
{
	return make_vec3(clamp(x.x, minVal, maxVal), clamp(x.y, minVal, maxVal), clamp(x.z, minVal, maxVal));
}
static inline vec4 clamp_vec4(vec4 x, float minVal, float maxVal)
{
	return make_vec4(clamp(x.x, minVal, maxVal), clamp(x.y, minVal, maxVal), clamp(x.z, minVal, maxVal), clamp(x.w, minVal, maxVal));
}

static float distance_vec2(vec2 a, vec2 b)
{
	return length_vec2(sub_vec2s(a, b));
}
static float distance_vec3(vec3 a, vec3 b)
{
	return length_vec3(sub_vec3s(a, b));
}

static inline vec3 reflect_vec3(vec3 i, vec3 n)
{
	return sub_vec3s(i, scale_vec3(n, 2 * dot_vec3s(i, n)));
}

static inline float smoothstep(float edge0, float edge1, float x)
{
	float t = clamp_01((x-edge0)/(edge1-edge0));
	return t*t*(3 - 2*t);
}


static inline float mix(float x, float y, float a)
{
	return x*(1-a) + y*a;
}

static inline vec2 mix_vec2s(vec2 x, vec2 y, float a)
{
	return add_vec2s(scale_vec2(x, (1-a)), scale_vec2(y, a));
}

static inline vec3 mix_vec3s(vec3 x, vec3 y, float a)
{
	return add_vec3s(scale_vec3(x, (1-a)), scale_vec3(y, a));
}

static inline vec4 mix_vec4s(vec4 x, vec4 y, float a)
{
	return add_vec4s(scale_vec4(x, (1-a)), scale_vec4(y, a));
}

// TODO should I use the float versions or the double versions for slightly
// increased accuracy?
PGL_VECTORIZE_VEC(fabsf)
PGL_VECTORIZE_VEC(floorf)
PGL_VECTORIZE_VEC(ceilf)
PGL_VECTORIZE_VEC(sinf)
PGL_VECTORIZE_VEC(cosf)
PGL_VECTORIZE_VEC(tanf)
PGL_VECTORIZE_VEC(asinf)
PGL_VECTORIZE_VEC(acosf)
PGL_VECTORIZE_VEC(atanf)
PGL_VECTORIZE_VEC(sinhf)
PGL_VECTORIZE_VEC(coshf)
PGL_VECTORIZE_VEC(tanhf)

static inline float radians(float degrees) { return DEG_TO_RAD(degrees); }
static inline float degrees(float radians) { return RAD_TO_DEG(radians); }
static inline float fract(float x) { return x - floor(x); }

PGL_STATIC_VECTORIZE_VEC(radians)
PGL_STATIC_VECTORIZE_VEC(degrees)
PGL_STATIC_VECTORIZE_VEC(fract)

#endif




typedef struct Color
{
	u8 r;
	u8 g;
	u8 b;
	u8 a;
} Color;

/*
Color make_Color()
{
	r = g = b = 0;
	a = 255;
}
*/

inline Color make_Color(u8 red, u8 green, u8 blue, u8 alpha)
{
	Color c = { red, green, blue, alpha };
	return c;
}

inline void print_Color(Color c, const char* append)
{
	printf("(%d, %d, %d, %d)%s", c.r, c.g, c.b, c.a, append);
}

inline Color vec4_to_Color(vec4 v)
{
	Color c;
	//assume all in the range of [0, 1]
	//TODO(rswinkle): round like HH?  ie (u8)(v.x * 255.0f + 0.5f)
	c.r = v.x * 255;
	c.g = v.y * 255;
	c.b = v.z * 255;
	c.a = v.w * 255;
	return c;
}

inline vec4 Color_to_vec4(Color c)
{
	vec4 v = { (float)c.r/255.0f, (float)c.g/255.0f, (float)c.b/255.0f, (float)c.a/255.0f };
	return v;
}

typedef struct Line
{
	float A, B, C;
} Line;

inline Line make_Line(float x1, float y1, float x2, float y2)
{
	Line l;
	l.A = y1 - y2;
	l.B = x2 - x1;
	l.C = x1*y2 - x2*y1;
	return l;
}

inline float line_func(Line* line, float x, float y)
{
	return line->A*x + line->B*y + line->C;
}
inline float line_findy(Line* line, float x)
{
	return -(line->A*x + line->C)/line->B;
}

inline float line_findx(Line* line, float y)
{
	return -(line->B*y + line->C)/line->A;
}


typedef struct Plane
{
	vec3 n;	//normal points x on plane satisfy n dot x = d
	float d; //d = n dot p

} Plane;

/*
Plane() {}
Plane(vec3 a, vec3 b, vec3 c)	//ccw winding
{
	n = cross_product(b-a, c-a).norm();
	d = n * a;
}
*/

//int intersect_segment_plane(vec3 a, vec3 b, Plane p, float* t, vec3* q);


// TODO hmm would have to change mat3 and mat4 to proper
// structures to have operators return them since our
// current mat*mat functions take the output mat as a parameter
#ifdef __cplusplus
inline vec3 operator*(mat3 m, vec3& v)
{
	vec3 r;
#ifndef ROW_MAJOR
	r.x = m[0]*v.x + m[3]*v.y + m[6]*v.z;
	r.y = m[1]*v.x + m[4]*v.y + m[7]*v.z;
	r.z = m[2]*v.x + m[5]*v.y + m[8]*v.z;
#else
	r.x = m[0]*v.x + m[1]*v.y + m[2]*v.z;
	r.y = m[3]*v.x + m[4]*v.y + m[5]*v.z;
	r.z = m[6]*v.x + m[7]*v.y + m[8]*v.z;
#endif
	return r;
}

#endif





/* CRSW_MATH_H */
#endif
#ifndef CVECTOR_float_H
#define CVECTOR_float_H

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Data structure for float vector. */
typedef struct cvector_float
{
	float* a;           /**< Array. */
	size_t size;       /**< Current size (amount you use when manipulating array directly). */
	size_t capacity;   /**< Allocated size of array; always >= size. */
} cvector_float;



extern size_t CVEC_float_SZ;

int cvec_float(cvector_float* vec, size_t size, size_t capacity);
int cvec_init_float(cvector_float* vec, float* vals, size_t num);

cvector_float* cvec_float_heap(size_t size, size_t capacity);
cvector_float* cvec_init_float_heap(float* vals, size_t num);
int cvec_copyc_float(void* dest, void* src);
int cvec_copy_float(cvector_float* dest, cvector_float* src);

int cvec_push_float(cvector_float* vec, float a);
float cvec_pop_float(cvector_float* vec);

int cvec_extend_float(cvector_float* vec, size_t num);
int cvec_insert_float(cvector_float* vec, size_t i, float a);
int cvec_insert_array_float(cvector_float* vec, size_t i, float* a, size_t num);
float cvec_replace_float(cvector_float* vec, size_t i, float a);
void cvec_erase_float(cvector_float* vec, size_t start, size_t end);
int cvec_reserve_float(cvector_float* vec, size_t size);
int cvec_set_cap_float(cvector_float* vec, size_t size);
void cvec_set_val_sz_float(cvector_float* vec, float val);
void cvec_set_val_cap_float(cvector_float* vec, float val);

float* cvec_back_float(cvector_float* vec);

void cvec_clear_float(cvector_float* vec);
void cvec_free_float_heap(void* vec);
void cvec_free_float(void* vec);

#ifdef __cplusplus
}
#endif

/* CVECTOR_float_H */
#endif


#ifdef CVECTOR_float_IMPLEMENTATION

size_t CVEC_float_SZ = 50;

#define CVEC_float_ALLOCATOR(x) ((x+1) * 2)


#if defined(CVEC_MALLOC) && defined(CVEC_FREE) && defined(CVEC_REALLOC)
/* ok */
#elif !defined(CVEC_MALLOC) && !defined(CVEC_FREE) && !defined(CVEC_REALLOC)
/* ok */
#else
#error "Must define all or none of CVEC_MALLOC, CVEC_FREE, and CVEC_REALLOC."
#endif

#ifndef CVEC_MALLOC
#define CVEC_MALLOC(sz)      malloc(sz)
#define CVEC_REALLOC(p, sz)  realloc(p, sz)
#define CVEC_FREE(p)         free(p)
#endif

#ifndef CVEC_MEMMOVE
#include <string.h>
#define CVEC_MEMMOVE(dst, src, sz)  memmove(dst, src, sz)
#endif

#ifndef CVEC_ASSERT
#include <assert.h>
#define CVEC_ASSERT(x)       assert(x)
#endif

cvector_float* cvec_float_heap(size_t size, size_t capacity)
{
	cvector_float* vec;
	if (!(vec = (cvector_float*)CVEC_MALLOC(sizeof(cvector_float)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_float_SZ;

	if (!(vec->a = (float*)CVEC_MALLOC(vec->capacity*sizeof(float)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	return vec;
}

cvector_float* cvec_init_float_heap(float* vals, size_t num)
{
	cvector_float* vec;
	
	if (!(vec = (cvector_float*)CVEC_MALLOC(sizeof(cvector_float)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->capacity = num + CVEC_float_SZ;
	vec->size = num;
	if (!(vec->a = (float*)CVEC_MALLOC(vec->capacity*sizeof(float)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(float)*num);

	return vec;
}

int cvec_float(cvector_float* vec, size_t size, size_t capacity)
{
	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_float_SZ;

	if (!(vec->a = (float*)CVEC_MALLOC(vec->capacity*sizeof(float)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	return 1;
}

int cvec_init_float(cvector_float* vec, float* vals, size_t num)
{
	vec->capacity = num + CVEC_float_SZ;
	vec->size = num;
	if (!(vec->a = (float*)CVEC_MALLOC(vec->capacity*sizeof(float)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(float)*num);

	return 1;
}

int cvec_copyc_float(void* dest, void* src)
{
	cvector_float* vec1 = (cvector_float*)dest;
	cvector_float* vec2 = (cvector_float*)src;

	vec1->a = NULL;
	vec1->size = 0;
	vec1->capacity = 0;

	return cvec_copy_float(vec1, vec2);
}

int cvec_copy_float(cvector_float* dest, cvector_float* src)
{
	float* tmp = NULL;
	if (!(tmp = (float*)CVEC_REALLOC(dest->a, src->capacity*sizeof(float)))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	dest->a = tmp;

	CVEC_MEMMOVE(dest->a, src->a, src->size*sizeof(float));
	dest->size = src->size;
	dest->capacity = src->capacity;
	return 1;
}


int cvec_push_float(cvector_float* vec, float a)
{
	float* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		vec->a[vec->size++] = a;
	} else {
		tmp_sz = CVEC_float_ALLOCATOR(vec->capacity);
		if (!(tmp = (float*)CVEC_REALLOC(vec->a, sizeof(float)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->a[vec->size++] = a;
		vec->capacity = tmp_sz;
	}
	return 1;
}

float cvec_pop_float(cvector_float* vec)
{
	return vec->a[--vec->size];
}

float* cvec_back_float(cvector_float* vec)
{
	return &vec->a[vec->size-1];
}

int cvec_extend_float(cvector_float* vec, size_t num)
{
	float* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_float_SZ;
		if (!(tmp = (float*)CVEC_REALLOC(vec->a, sizeof(float)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	vec->size += num;
	return 1;
}

int cvec_insert_float(cvector_float* vec, size_t i, float a)
{
	float* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(float));
		vec->a[i] = a;
	} else {
		tmp_sz = CVEC_float_ALLOCATOR(vec->capacity);
		if (!(tmp = (float*)CVEC_REALLOC(vec->a, sizeof(float)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(float));
		vec->a[i] = a;
		vec->capacity = tmp_sz;
	}

	vec->size++;
	return 1;
}

int cvec_insert_array_float(cvector_float* vec, size_t i, float* a, size_t num)
{
	float* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_float_SZ;
		if (!(tmp = (float*)CVEC_REALLOC(vec->a, sizeof(float)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	CVEC_MEMMOVE(&vec->a[i+num], &vec->a[i], (vec->size-i)*sizeof(float));
	CVEC_MEMMOVE(&vec->a[i], a, num*sizeof(float));
	vec->size += num;
	return 1;
}

float cvec_replace_float(cvector_float* vec, size_t i, float a)
{
	float tmp = vec->a[i];
	vec->a[i] = a;
	return tmp;
}

void cvec_erase_float(cvector_float* vec, size_t start, size_t end)
{
	size_t d = end - start + 1;
	CVEC_MEMMOVE(&vec->a[start], &vec->a[end+1], (vec->size-1-end)*sizeof(float));
	vec->size -= d;
}


int cvec_reserve_float(cvector_float* vec, size_t size)
{
	float* tmp;
	if (vec->capacity < size) {
		if (!(tmp = (float*)CVEC_REALLOC(vec->a, sizeof(float)*(size+CVEC_float_SZ)))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = size + CVEC_float_SZ;
	}
	return 1;
}

int cvec_set_cap_float(cvector_float* vec, size_t size)
{
	float* tmp;
	if (size < vec->size) {
		vec->size = size;
	}

	if (!(tmp = (float*)CVEC_REALLOC(vec->a, sizeof(float)*size))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	vec->a = tmp;
	vec->capacity = size;
	return 1;
}

void cvec_set_val_sz_float(cvector_float* vec, float val)
{
	size_t i;
	for (i=0; i<vec->size; i++) {
		vec->a[i] = val;
	}
}

void cvec_set_val_cap_float(cvector_float* vec, float val)
{
	size_t i;
	for (i=0; i<vec->capacity; i++) {
		vec->a[i] = val;
	}
}

void cvec_clear_float(cvector_float* vec) { vec->size = 0; }

void cvec_free_float_heap(void* vec)
{
	cvector_float* tmp = (cvector_float*)vec;
	if (!tmp) return;
	CVEC_FREE(tmp->a);
	CVEC_FREE(tmp);
}

void cvec_free_float(void* vec)
{
	cvector_float* tmp = (cvector_float*)vec;
	CVEC_FREE(tmp->a);
	tmp->size = 0;
	tmp->capacity = 0;
}

#endif



#include <stdint.h>

typedef uint32_t GLuint;
typedef int32_t  GLint;
typedef int64_t  GLint64;
typedef uint64_t GLuint64;
typedef uint16_t GLushort;
typedef int16_t  GLshort;
typedef uint8_t  GLubyte;
typedef int8_t   GLbyte;
typedef char     GLchar;
typedef int32_t  GLsizei;  //they use plain int not unsigned like you'd think
typedef int      GLenum;
typedef int      GLbitfield;
typedef float    GLfloat;
typedef float    GLclampf;
typedef double   GLdouble;
typedef void     GLvoid;
typedef uint8_t  GLboolean;



enum
{
	//gl error codes
	GL_NO_ERROR = 0,
	GL_INVALID_ENUM,
	GL_INVALID_VALUE,
	GL_INVALID_OPERATION,
	GL_INVALID_FRAMEBUFFER_OPERATION,
	GL_OUT_OF_MEMORY,

	//buffer types
	GL_ARRAY_BUFFER,
	GL_COPY_READ_BUFFER,
	GL_COPY_WRITE_BUFFER,
	GL_ELEMENT_ARRAY_BUFFER,
	GL_PIXEL_PACK_BUFFER,
	GL_PIXEL_UNPACK_BUFFER,
	GL_TEXTURE_BUFFER,
	GL_TRANSFORM_FEEDBACK_BUFFER,
	GL_UNIFORM_BUFFER,
	GL_NUM_BUFFER_TYPES,

	//buffer use hints (not used currently)
	GL_STREAM_DRAW,
	GL_STREAM_READ,
	GL_STREAM_COPY,
	GL_STATIC_DRAW,
	GL_STATIC_READ,
	GL_STATIC_COPY,
	GL_DYNAMIC_DRAW,
	GL_DYNAMIC_READ,
	GL_DYNAMIC_COPY,

	// mapped buffer access
	GL_READ_ONLY,
	GL_WRITE_ONLY,
	GL_READ_WRITE,

	//polygon modes
	GL_POINT,
	GL_LINE,
	GL_FILL,

	//primitive types
	GL_POINTS,
	GL_LINES,
	GL_LINE_STRIP,
	GL_LINE_LOOP,
	GL_TRIANGLES,
	GL_TRIANGLE_STRIP,
	GL_TRIANGLE_FAN,

	// unsupported primitives because I don't support the geometry shader
	GL_LINE_STRIP_AJACENCY,
	GL_LINES_AJACENCY,
	GL_TRIANGLES_AJACENCY,
	GL_TRIANGLE_STRIP_AJACENCY,

	//depth functions (and stencil funcs)
	GL_LESS,
	GL_LEQUAL,
	GL_GREATER,
	GL_GEQUAL,
	GL_EQUAL,
	GL_NOTEQUAL,
	GL_ALWAYS,
	GL_NEVER,

	//blend functions
	GL_ZERO,
	GL_ONE,
	GL_SRC_COLOR,
	GL_ONE_MINUS_SRC_COLOR,
	GL_DST_COLOR,
	GL_ONE_MINUS_DST_COLOR,
	GL_SRC_ALPHA,
	GL_ONE_MINUS_SRC_ALPHA,
	GL_DST_ALPHA,
	GL_ONE_MINUS_DST_ALPHA,
	GL_CONSTANT_COLOR,
	GL_ONE_MINUS_CONSTANT_COLOR,
	GL_CONSTANT_ALPHA,
	GL_ONE_MINUS_CONSTANT_ALPHA,
	GL_SRC_ALPHA_SATURATE,
	NUM_BLEND_FUNCS,
	GL_SRC1_COLOR,
	GL_ONE_MINUS_SRC1_COLOR,
	GL_SRC1_ALPHA,
	GL_ONE_MINUS_SRC1_ALPHA,
	//NUM_BLEND_FUNCS

	//blend equations
	GL_FUNC_ADD,
	GL_FUNC_SUBTRACT,
	GL_FUNC_REVERSE_SUBTRACT,
	GL_MIN,
	GL_MAX,
	NUM_BLEND_EQUATIONS,

	//texture types
	GL_TEXTURE_UNBOUND,
	GL_TEXTURE_1D,
	GL_TEXTURE_2D,
	GL_TEXTURE_3D,
	GL_TEXTURE_1D_ARRAY,
	GL_TEXTURE_2D_ARRAY,
	GL_TEXTURE_RECTANGLE,
	GL_TEXTURE_CUBE_MAP,
	GL_NUM_TEXTURE_TYPES,
	GL_TEXTURE_CUBE_MAP_POSITIVE_X,
	GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
	GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
	GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
	GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
	GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,

	//texture parameters i
	GL_TEXTURE_BASE_LEVEL,
	GL_TEXTURE_BORDER_COLOR, // doesn't actually do anything
	GL_TEXTURE_COMPARE_FUNC,
	GL_TEXTURE_COMPARE_MODE,
	GL_TEXTURE_LOD_BIAS,
	GL_TEXTURE_MIN_FILTER,
	GL_TEXTURE_MAG_FILTER,
	GL_TEXTURE_MIN_LOD,
	GL_TEXTURE_MAX_LOD,
	GL_TEXTURE_MAX_LEVEL,
	GL_TEXTURE_SWIZZLE_R,
	GL_TEXTURE_SWIZZLE_G,
	GL_TEXTURE_SWIZZLE_B,
	GL_TEXTURE_SWIZZLE_A,
	GL_TEXTURE_SWIZZLE_RGBA,
	GL_TEXTURE_WRAP_S,
	GL_TEXTURE_WRAP_T,
	GL_TEXTURE_WRAP_R,

	//texture parameter values
	GL_REPEAT,
	GL_CLAMP_TO_EDGE,
	GL_CLAMP_TO_BORDER,  // not supported, alias to CLAMP_TO_EDGE
	GL_MIRRORED_REPEAT,
	GL_NEAREST,
	GL_LINEAR,
	GL_NEAREST_MIPMAP_NEAREST,
	GL_NEAREST_MIPMAP_LINEAR,
	GL_LINEAR_MIPMAP_NEAREST,
	GL_LINEAR_MIPMAP_LINEAR,

	//texture formats
	GL_RED,
	GL_RG,
	GL_RGB,
	GL_BGR,
	GL_RGBA,
	GL_BGRA,
	GL_COMPRESSED_RED,
	GL_COMPRESSED_RG,
	GL_COMPRESSED_RGB,
	GL_COMPRESSED_RGBA,
	//lots more go here but not important
	
	//PixelStore parameters
	GL_UNPACK_ALIGNMENT,
	GL_PACK_ALIGNMENT,

	// Texture unit's (not used but eases porting)
	// but I'm not doing 80 or bothering with GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS
	GL_TEXTURE0,
	GL_TEXTURE1,
	GL_TEXTURE2,
	GL_TEXTURE3,
	GL_TEXTURE4,
	GL_TEXTURE5,
	GL_TEXTURE6,
	GL_TEXTURE7,
	
	//implemented glEnable options
	GL_CULL_FACE,
	GL_DEPTH_TEST,
	GL_DEPTH_CLAMP,
	GL_LINE_SMOOTH,  // TODO correctly
	GL_BLEND,
	GL_COLOR_LOGIC_OP,
	GL_POLYGON_OFFSET_FILL,
	GL_SCISSOR_TEST,
	GL_STENCIL_TEST,

	//provoking vertex
	GL_FIRST_VERTEX_CONVENTION,
	GL_LAST_VERTEX_CONVENTION,

	//point sprite stuff
	GL_POINT_SPRITE_COORD_ORIGIN,
	GL_UPPER_LEFT,
	GL_LOWER_LEFT,

	//front face determination/culling
	GL_FRONT,
	GL_BACK,
	GL_FRONT_AND_BACK,
	GL_CCW,
	GL_CW,

	// glLogicOp logic ops
	GL_CLEAR,
	GL_SET,
	GL_COPY,
	GL_COPY_INVERTED,
	GL_NOOP,
	GL_AND,
	GL_NAND,
	GL_OR,
	GL_NOR,
	GL_XOR,
	GL_EQUIV,
	GL_AND_REVERSE,
	GL_AND_INVERTED,
	GL_OR_REVERSE,
	GL_OR_INVERTED,
	GL_INVERT,

	// glStencilOp
	GL_KEEP,
	//GL_ZERO, already defined in blend functions aggh
	GL_REPLACE,
	GL_INCR,
	GL_INCR_WRAP,
	GL_DECR,
	GL_DECR_WRAP,
	//GL_INVERT,   // already defined in LogicOps

	//data types
	GL_UNSIGNED_BYTE,
	GL_BYTE,
	GL_BITMAP,
	GL_UNSIGNED_SHORT,
	GL_SHORT,
	GL_UNSIGNED_INT,
	GL_INT,
	GL_FLOAT,

	//glGetString info
	GL_VENDOR,
	GL_RENDERER,
	GL_VERSION,
	GL_SHADING_LANGUAGE_VERSION,

	// glGet enums
	GL_POLYGON_OFFSET_FACTOR,
	GL_POLYGON_OFFSET_UNITS,
	GL_POINT_SIZE,
	GL_DEPTH_CLEAR_VALUE,
	GL_DEPTH_RANGE,
	GL_STENCIL_WRITE_MASK,
	GL_STENCIL_REF,
	GL_STENCIL_VALUE_MASK,
	GL_STENCIL_FUNC,
	GL_STENCIL_FAIL,
	GL_STENCIL_PASS_DEPTH_FAIL,
	GL_STENCIL_PASS_DEPTH_PASS,

	GL_STENCIL_BACK_WRITE_MASK,
	GL_STENCIL_BACK_REF,
	GL_STENCIL_BACK_VALUE_MASK,
	GL_STENCIL_BACK_FUNC,
	GL_STENCIL_BACK_FAIL,
	GL_STENCIL_BACK_PASS_DEPTH_FAIL,
	GL_STENCIL_BACK_PASS_DEPTH_PASS,

	GL_LOGIC_OP_MODE,
	GL_BLEND_SRC_RGB,
	GL_BLEND_SRC_ALPHA,
	GL_BLEND_DST_RGB,
	GL_BLEND_DST_ALPHA,

	GL_BLEND_EQUATION_RGB,
	GL_BLEND_EQUATION_ALPHA,

	GL_CULL_FACE_MODE,
	GL_FRONT_FACE,
	GL_DEPTH_FUNC,
	//GL_POINT_SPRITE_COORD_ORIGIN,
	GL_PROVOKING_VERTEX,

	GL_POLYGON_MODE,

	//shader types etc. not used, just here for compatibility add what you
	//need so you can use your OpenGL code with PortableGL with minimal changes
	GL_COMPUTE_SHADER,
	GL_VERTEX_SHADER,
	GL_TESS_CONTROL_SHADER,
	GL_TESS_EVALUATION_SHADER,
	GL_GEOMETRY_SHADER,
	GL_FRAGMENT_SHADER,

	GL_INFO_LOG_LENGTH,
	GL_COMPILE_STATUS,
	GL_LINK_STATUS,

	// buffer clearing selections are a mask so can't have overlap
	// choosing arbitrary bits higher than all other constants in enum
	GL_COLOR_BUFFER_BIT = 1 << 10,
	GL_DEPTH_BUFFER_BIT = 1 << 11,
	GL_STENCIL_BUFFER_BIT = 1 << 12
};

#define GL_FALSE 0
#define GL_TRUE 1





#define MAX_VERTICES 500000
#define GL_MAX_VERTEX_ATTRIBS 16
#define GL_MAX_VERTEX_OUTPUT_COMPONENTS 64
#define GL_MAX_DRAW_BUFFERS 8

//TODO use prefix like GL_SMOOTH?  PGL_SMOOTH?
enum { SMOOTH, FLAT, NOPERSPECTIVE };




//TODO NOT USED YET
typedef struct PerVertex {
	vec4 gl_Position;
	float gl_PointSize;
	float gl_ClipDistance[6];
} PerVertex;

typedef struct Shader_Builtins
{
	//PerVertex gl_PerVertex;
	vec4 gl_Position;
	GLint gl_InstanceID;
	vec2 gl_PointCoord;

	GLboolean gl_FrontFacing;
	vec4 gl_FragCoord;
	vec4 gl_FragColor;

	//vec4 gl_FragData[GL_MAX_DRAW_BUFFERS];
	
	float gl_FragDepth;
	GLboolean discard;

} Shader_Builtins;

typedef void (*vert_func)(float* vs_output, void* vertex_attribs, Shader_Builtins* builtins, void* uniforms);
typedef void (*frag_func)(float* fs_input, Shader_Builtins* builtins, void* uniforms);

typedef struct glProgram
{
	vert_func vertex_shader;
	frag_func fragment_shader;
	void* uniform;
	int vs_output_size;
	GLenum interpolation[GL_MAX_VERTEX_OUTPUT_COMPONENTS];

	// Need to come up with a better name to mean "I write to glFragDepth or discard
	// pixels in this shader so you can't do pre-shader depth testing... not that I currently
	// support that anyway at this point but maybe eventually
	GLboolean fragdepth_or_discard;

	GLboolean deleted;

} glProgram;

typedef struct glBuffer
{
	/*
	GLenum usage;
	GLenum access;
	GLint access_flags;
	void* map_pointer;
	GLsizei map_offset;
	GLsizei map_length;
	*/

	GLsizei size;
	GLenum type;
	u8* data;

	GLboolean deleted;

	// true if the user uses one of the pgl data extension functions that
	// doesn't copy the data.
	// If true, PGL does not free it when deleting the buffer
	GLboolean user_owned;
} glBuffer;

typedef struct glVertex_Attrib
{
	GLint size;      // number of components 1-4
	GLenum type;     // GL_FLOAT, default
	GLsizei stride;  //
	GLsizei offset;  //
	GLboolean normalized;
	unsigned int buf;
	GLboolean enabled;
	GLuint divisor;
} glVertex_Attrib;

void init_glVertex_Attrib(glVertex_Attrib* v);
//void init_glVertex_Attrib(glVertex_Attrib* v, GLint size, GLenum type, GLsizei stride, GLsizei offset, GLboolean normalized, Buffer* buf);


typedef struct glVertex_Array
{
	glVertex_Attrib vertex_attribs[GL_MAX_VERTEX_ATTRIBS];

	//GLuint n_array_bufs;
	GLuint element_buffer;
	GLboolean deleted;

} glVertex_Array;

void init_glVertex_Array(glVertex_Array* v);


typedef struct glTexture
{
	unsigned int w;
	unsigned int h;
	unsigned int d;

	int base_level;
//	vec4 border_color; // no longer support borders not worth it
	GLenum mag_filter;
	GLenum min_filter;
	GLenum wrap_s;
	GLenum wrap_t;
	GLenum wrap_r;

	// TODO?
	//GLenum datatype; // only support GL_UNSIGNED_BYTE so not worth having yet
	GLenum format; // GL_RED, GL_RG, GL_RGB/BGR, GL_RGBA/BGRA
	
	GLenum type; // GL_TEXTURE_UNBOUND, GL_TEXTURE_2D etc.

	GLboolean deleted;

	// TODO same meaning as in glBuffer
	GLboolean user_owned;

	u8* data;
} glTexture;

typedef struct glVertex
{
	vec4 clip_space;
	vec4 screen_space;
	int clip_code;
	int edge_flag;
	float* vs_out;
} glVertex;

typedef struct glFramebuffer
{
	u8* buf;
	u8* lastrow; //better or worse than + h-1 every pixel draw?
	size_t w;
	size_t h;
} glFramebuffer;

typedef struct Vertex_Shader_output
{
	int size;
	GLenum* interpolation;

	// TODO Should this be a vector?  or just a pointer?
	// All I currently use is the constructor, reserve and free...
	// I could remove the rest of the cvector_float functions to save on bloat
	// but still easily add back functions as needed...
	//
	// or like comment in init_glContext says just allocate to the max size and be done
	cvector_float output_buf;
} Vertex_Shader_output;


typedef void (*draw_triangle_func)(glVertex* v0, glVertex* v1, glVertex* v2, unsigned int provoke);


#ifndef CVECTOR_glVertex_Array_H
#define CVECTOR_glVertex_Array_H

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Data structure for glVertex_Array vector. */
typedef struct cvector_glVertex_Array
{
	glVertex_Array* a;           /**< Array. */
	size_t size;       /**< Current size (amount you use when manipulating array directly). */
	size_t capacity;   /**< Allocated size of array; always >= size. */
} cvector_glVertex_Array;



extern size_t CVEC_glVertex_Array_SZ;

int cvec_glVertex_Array(cvector_glVertex_Array* vec, size_t size, size_t capacity);
int cvec_init_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array* vals, size_t num);

cvector_glVertex_Array* cvec_glVertex_Array_heap(size_t size, size_t capacity);
cvector_glVertex_Array* cvec_init_glVertex_Array_heap(glVertex_Array* vals, size_t num);
int cvec_copyc_glVertex_Array(void* dest, void* src);
int cvec_copy_glVertex_Array(cvector_glVertex_Array* dest, cvector_glVertex_Array* src);

int cvec_push_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array a);
glVertex_Array cvec_pop_glVertex_Array(cvector_glVertex_Array* vec);

int cvec_extend_glVertex_Array(cvector_glVertex_Array* vec, size_t num);
int cvec_insert_glVertex_Array(cvector_glVertex_Array* vec, size_t i, glVertex_Array a);
int cvec_insert_array_glVertex_Array(cvector_glVertex_Array* vec, size_t i, glVertex_Array* a, size_t num);
glVertex_Array cvec_replace_glVertex_Array(cvector_glVertex_Array* vec, size_t i, glVertex_Array a);
void cvec_erase_glVertex_Array(cvector_glVertex_Array* vec, size_t start, size_t end);
int cvec_reserve_glVertex_Array(cvector_glVertex_Array* vec, size_t size);
int cvec_set_cap_glVertex_Array(cvector_glVertex_Array* vec, size_t size);
void cvec_set_val_sz_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array val);
void cvec_set_val_cap_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array val);

glVertex_Array* cvec_back_glVertex_Array(cvector_glVertex_Array* vec);

void cvec_clear_glVertex_Array(cvector_glVertex_Array* vec);
void cvec_free_glVertex_Array_heap(void* vec);
void cvec_free_glVertex_Array(void* vec);

#ifdef __cplusplus
}
#endif

/* CVECTOR_glVertex_Array_H */
#endif


#ifdef CVECTOR_glVertex_Array_IMPLEMENTATION

size_t CVEC_glVertex_Array_SZ = 50;

#define CVEC_glVertex_Array_ALLOCATOR(x) ((x+1) * 2)


#if defined(CVEC_MALLOC) && defined(CVEC_FREE) && defined(CVEC_REALLOC)
/* ok */
#elif !defined(CVEC_MALLOC) && !defined(CVEC_FREE) && !defined(CVEC_REALLOC)
/* ok */
#else
#error "Must define all or none of CVEC_MALLOC, CVEC_FREE, and CVEC_REALLOC."
#endif

#ifndef CVEC_MALLOC
#define CVEC_MALLOC(sz)      malloc(sz)
#define CVEC_REALLOC(p, sz)  realloc(p, sz)
#define CVEC_FREE(p)         free(p)
#endif

#ifndef CVEC_MEMMOVE
#include <string.h>
#define CVEC_MEMMOVE(dst, src, sz)  memmove(dst, src, sz)
#endif

#ifndef CVEC_ASSERT
#include <assert.h>
#define CVEC_ASSERT(x)       assert(x)
#endif

cvector_glVertex_Array* cvec_glVertex_Array_heap(size_t size, size_t capacity)
{
	cvector_glVertex_Array* vec;
	if (!(vec = (cvector_glVertex_Array*)CVEC_MALLOC(sizeof(cvector_glVertex_Array)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glVertex_Array_SZ;

	if (!(vec->a = (glVertex_Array*)CVEC_MALLOC(vec->capacity*sizeof(glVertex_Array)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	return vec;
}

cvector_glVertex_Array* cvec_init_glVertex_Array_heap(glVertex_Array* vals, size_t num)
{
	cvector_glVertex_Array* vec;
	
	if (!(vec = (cvector_glVertex_Array*)CVEC_MALLOC(sizeof(cvector_glVertex_Array)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->capacity = num + CVEC_glVertex_Array_SZ;
	vec->size = num;
	if (!(vec->a = (glVertex_Array*)CVEC_MALLOC(vec->capacity*sizeof(glVertex_Array)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glVertex_Array)*num);

	return vec;
}

int cvec_glVertex_Array(cvector_glVertex_Array* vec, size_t size, size_t capacity)
{
	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glVertex_Array_SZ;

	if (!(vec->a = (glVertex_Array*)CVEC_MALLOC(vec->capacity*sizeof(glVertex_Array)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	return 1;
}

int cvec_init_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array* vals, size_t num)
{
	vec->capacity = num + CVEC_glVertex_Array_SZ;
	vec->size = num;
	if (!(vec->a = (glVertex_Array*)CVEC_MALLOC(vec->capacity*sizeof(glVertex_Array)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glVertex_Array)*num);

	return 1;
}

int cvec_copyc_glVertex_Array(void* dest, void* src)
{
	cvector_glVertex_Array* vec1 = (cvector_glVertex_Array*)dest;
	cvector_glVertex_Array* vec2 = (cvector_glVertex_Array*)src;

	vec1->a = NULL;
	vec1->size = 0;
	vec1->capacity = 0;

	return cvec_copy_glVertex_Array(vec1, vec2);
}

int cvec_copy_glVertex_Array(cvector_glVertex_Array* dest, cvector_glVertex_Array* src)
{
	glVertex_Array* tmp = NULL;
	if (!(tmp = (glVertex_Array*)CVEC_REALLOC(dest->a, src->capacity*sizeof(glVertex_Array)))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	dest->a = tmp;

	CVEC_MEMMOVE(dest->a, src->a, src->size*sizeof(glVertex_Array));
	dest->size = src->size;
	dest->capacity = src->capacity;
	return 1;
}


int cvec_push_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array a)
{
	glVertex_Array* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		vec->a[vec->size++] = a;
	} else {
		tmp_sz = CVEC_glVertex_Array_ALLOCATOR(vec->capacity);
		if (!(tmp = (glVertex_Array*)CVEC_REALLOC(vec->a, sizeof(glVertex_Array)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->a[vec->size++] = a;
		vec->capacity = tmp_sz;
	}
	return 1;
}

glVertex_Array cvec_pop_glVertex_Array(cvector_glVertex_Array* vec)
{
	return vec->a[--vec->size];
}

glVertex_Array* cvec_back_glVertex_Array(cvector_glVertex_Array* vec)
{
	return &vec->a[vec->size-1];
}

int cvec_extend_glVertex_Array(cvector_glVertex_Array* vec, size_t num)
{
	glVertex_Array* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glVertex_Array_SZ;
		if (!(tmp = (glVertex_Array*)CVEC_REALLOC(vec->a, sizeof(glVertex_Array)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	vec->size += num;
	return 1;
}

int cvec_insert_glVertex_Array(cvector_glVertex_Array* vec, size_t i, glVertex_Array a)
{
	glVertex_Array* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glVertex_Array));
		vec->a[i] = a;
	} else {
		tmp_sz = CVEC_glVertex_Array_ALLOCATOR(vec->capacity);
		if (!(tmp = (glVertex_Array*)CVEC_REALLOC(vec->a, sizeof(glVertex_Array)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glVertex_Array));
		vec->a[i] = a;
		vec->capacity = tmp_sz;
	}

	vec->size++;
	return 1;
}

int cvec_insert_array_glVertex_Array(cvector_glVertex_Array* vec, size_t i, glVertex_Array* a, size_t num)
{
	glVertex_Array* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glVertex_Array_SZ;
		if (!(tmp = (glVertex_Array*)CVEC_REALLOC(vec->a, sizeof(glVertex_Array)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	CVEC_MEMMOVE(&vec->a[i+num], &vec->a[i], (vec->size-i)*sizeof(glVertex_Array));
	CVEC_MEMMOVE(&vec->a[i], a, num*sizeof(glVertex_Array));
	vec->size += num;
	return 1;
}

glVertex_Array cvec_replace_glVertex_Array(cvector_glVertex_Array* vec, size_t i, glVertex_Array a)
{
	glVertex_Array tmp = vec->a[i];
	vec->a[i] = a;
	return tmp;
}

void cvec_erase_glVertex_Array(cvector_glVertex_Array* vec, size_t start, size_t end)
{
	size_t d = end - start + 1;
	CVEC_MEMMOVE(&vec->a[start], &vec->a[end+1], (vec->size-1-end)*sizeof(glVertex_Array));
	vec->size -= d;
}


int cvec_reserve_glVertex_Array(cvector_glVertex_Array* vec, size_t size)
{
	glVertex_Array* tmp;
	if (vec->capacity < size) {
		if (!(tmp = (glVertex_Array*)CVEC_REALLOC(vec->a, sizeof(glVertex_Array)*(size+CVEC_glVertex_Array_SZ)))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = size + CVEC_glVertex_Array_SZ;
	}
	return 1;
}

int cvec_set_cap_glVertex_Array(cvector_glVertex_Array* vec, size_t size)
{
	glVertex_Array* tmp;
	if (size < vec->size) {
		vec->size = size;
	}

	if (!(tmp = (glVertex_Array*)CVEC_REALLOC(vec->a, sizeof(glVertex_Array)*size))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	vec->a = tmp;
	vec->capacity = size;
	return 1;
}

void cvec_set_val_sz_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array val)
{
	size_t i;
	for (i=0; i<vec->size; i++) {
		vec->a[i] = val;
	}
}

void cvec_set_val_cap_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array val)
{
	size_t i;
	for (i=0; i<vec->capacity; i++) {
		vec->a[i] = val;
	}
}

void cvec_clear_glVertex_Array(cvector_glVertex_Array* vec) { vec->size = 0; }

void cvec_free_glVertex_Array_heap(void* vec)
{
	cvector_glVertex_Array* tmp = (cvector_glVertex_Array*)vec;
	if (!tmp) return;
	CVEC_FREE(tmp->a);
	CVEC_FREE(tmp);
}

void cvec_free_glVertex_Array(void* vec)
{
	cvector_glVertex_Array* tmp = (cvector_glVertex_Array*)vec;
	CVEC_FREE(tmp->a);
	tmp->size = 0;
	tmp->capacity = 0;
}

#endif
#ifndef CVECTOR_glBuffer_H
#define CVECTOR_glBuffer_H

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Data structure for glBuffer vector. */
typedef struct cvector_glBuffer
{
	glBuffer* a;           /**< Array. */
	size_t size;       /**< Current size (amount you use when manipulating array directly). */
	size_t capacity;   /**< Allocated size of array; always >= size. */
} cvector_glBuffer;



extern size_t CVEC_glBuffer_SZ;

int cvec_glBuffer(cvector_glBuffer* vec, size_t size, size_t capacity);
int cvec_init_glBuffer(cvector_glBuffer* vec, glBuffer* vals, size_t num);

cvector_glBuffer* cvec_glBuffer_heap(size_t size, size_t capacity);
cvector_glBuffer* cvec_init_glBuffer_heap(glBuffer* vals, size_t num);
int cvec_copyc_glBuffer(void* dest, void* src);
int cvec_copy_glBuffer(cvector_glBuffer* dest, cvector_glBuffer* src);

int cvec_push_glBuffer(cvector_glBuffer* vec, glBuffer a);
glBuffer cvec_pop_glBuffer(cvector_glBuffer* vec);

int cvec_extend_glBuffer(cvector_glBuffer* vec, size_t num);
int cvec_insert_glBuffer(cvector_glBuffer* vec, size_t i, glBuffer a);
int cvec_insert_array_glBuffer(cvector_glBuffer* vec, size_t i, glBuffer* a, size_t num);
glBuffer cvec_replace_glBuffer(cvector_glBuffer* vec, size_t i, glBuffer a);
void cvec_erase_glBuffer(cvector_glBuffer* vec, size_t start, size_t end);
int cvec_reserve_glBuffer(cvector_glBuffer* vec, size_t size);
int cvec_set_cap_glBuffer(cvector_glBuffer* vec, size_t size);
void cvec_set_val_sz_glBuffer(cvector_glBuffer* vec, glBuffer val);
void cvec_set_val_cap_glBuffer(cvector_glBuffer* vec, glBuffer val);

glBuffer* cvec_back_glBuffer(cvector_glBuffer* vec);

void cvec_clear_glBuffer(cvector_glBuffer* vec);
void cvec_free_glBuffer_heap(void* vec);
void cvec_free_glBuffer(void* vec);

#ifdef __cplusplus
}
#endif

/* CVECTOR_glBuffer_H */
#endif


#ifdef CVECTOR_glBuffer_IMPLEMENTATION

size_t CVEC_glBuffer_SZ = 50;

#define CVEC_glBuffer_ALLOCATOR(x) ((x+1) * 2)


#if defined(CVEC_MALLOC) && defined(CVEC_FREE) && defined(CVEC_REALLOC)
/* ok */
#elif !defined(CVEC_MALLOC) && !defined(CVEC_FREE) && !defined(CVEC_REALLOC)
/* ok */
#else
#error "Must define all or none of CVEC_MALLOC, CVEC_FREE, and CVEC_REALLOC."
#endif

#ifndef CVEC_MALLOC
#define CVEC_MALLOC(sz)      malloc(sz)
#define CVEC_REALLOC(p, sz)  realloc(p, sz)
#define CVEC_FREE(p)         free(p)
#endif

#ifndef CVEC_MEMMOVE
#include <string.h>
#define CVEC_MEMMOVE(dst, src, sz)  memmove(dst, src, sz)
#endif

#ifndef CVEC_ASSERT
#include <assert.h>
#define CVEC_ASSERT(x)       assert(x)
#endif

cvector_glBuffer* cvec_glBuffer_heap(size_t size, size_t capacity)
{
	cvector_glBuffer* vec;
	if (!(vec = (cvector_glBuffer*)CVEC_MALLOC(sizeof(cvector_glBuffer)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glBuffer_SZ;

	if (!(vec->a = (glBuffer*)CVEC_MALLOC(vec->capacity*sizeof(glBuffer)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	return vec;
}

cvector_glBuffer* cvec_init_glBuffer_heap(glBuffer* vals, size_t num)
{
	cvector_glBuffer* vec;
	
	if (!(vec = (cvector_glBuffer*)CVEC_MALLOC(sizeof(cvector_glBuffer)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->capacity = num + CVEC_glBuffer_SZ;
	vec->size = num;
	if (!(vec->a = (glBuffer*)CVEC_MALLOC(vec->capacity*sizeof(glBuffer)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glBuffer)*num);

	return vec;
}

int cvec_glBuffer(cvector_glBuffer* vec, size_t size, size_t capacity)
{
	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glBuffer_SZ;

	if (!(vec->a = (glBuffer*)CVEC_MALLOC(vec->capacity*sizeof(glBuffer)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	return 1;
}

int cvec_init_glBuffer(cvector_glBuffer* vec, glBuffer* vals, size_t num)
{
	vec->capacity = num + CVEC_glBuffer_SZ;
	vec->size = num;
	if (!(vec->a = (glBuffer*)CVEC_MALLOC(vec->capacity*sizeof(glBuffer)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glBuffer)*num);

	return 1;
}

int cvec_copyc_glBuffer(void* dest, void* src)
{
	cvector_glBuffer* vec1 = (cvector_glBuffer*)dest;
	cvector_glBuffer* vec2 = (cvector_glBuffer*)src;

	vec1->a = NULL;
	vec1->size = 0;
	vec1->capacity = 0;

	return cvec_copy_glBuffer(vec1, vec2);
}

int cvec_copy_glBuffer(cvector_glBuffer* dest, cvector_glBuffer* src)
{
	glBuffer* tmp = NULL;
	if (!(tmp = (glBuffer*)CVEC_REALLOC(dest->a, src->capacity*sizeof(glBuffer)))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	dest->a = tmp;

	CVEC_MEMMOVE(dest->a, src->a, src->size*sizeof(glBuffer));
	dest->size = src->size;
	dest->capacity = src->capacity;
	return 1;
}


int cvec_push_glBuffer(cvector_glBuffer* vec, glBuffer a)
{
	glBuffer* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		vec->a[vec->size++] = a;
	} else {
		tmp_sz = CVEC_glBuffer_ALLOCATOR(vec->capacity);
		if (!(tmp = (glBuffer*)CVEC_REALLOC(vec->a, sizeof(glBuffer)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->a[vec->size++] = a;
		vec->capacity = tmp_sz;
	}
	return 1;
}

glBuffer cvec_pop_glBuffer(cvector_glBuffer* vec)
{
	return vec->a[--vec->size];
}

glBuffer* cvec_back_glBuffer(cvector_glBuffer* vec)
{
	return &vec->a[vec->size-1];
}

int cvec_extend_glBuffer(cvector_glBuffer* vec, size_t num)
{
	glBuffer* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glBuffer_SZ;
		if (!(tmp = (glBuffer*)CVEC_REALLOC(vec->a, sizeof(glBuffer)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	vec->size += num;
	return 1;
}

int cvec_insert_glBuffer(cvector_glBuffer* vec, size_t i, glBuffer a)
{
	glBuffer* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glBuffer));
		vec->a[i] = a;
	} else {
		tmp_sz = CVEC_glBuffer_ALLOCATOR(vec->capacity);
		if (!(tmp = (glBuffer*)CVEC_REALLOC(vec->a, sizeof(glBuffer)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glBuffer));
		vec->a[i] = a;
		vec->capacity = tmp_sz;
	}

	vec->size++;
	return 1;
}

int cvec_insert_array_glBuffer(cvector_glBuffer* vec, size_t i, glBuffer* a, size_t num)
{
	glBuffer* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glBuffer_SZ;
		if (!(tmp = (glBuffer*)CVEC_REALLOC(vec->a, sizeof(glBuffer)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	CVEC_MEMMOVE(&vec->a[i+num], &vec->a[i], (vec->size-i)*sizeof(glBuffer));
	CVEC_MEMMOVE(&vec->a[i], a, num*sizeof(glBuffer));
	vec->size += num;
	return 1;
}

glBuffer cvec_replace_glBuffer(cvector_glBuffer* vec, size_t i, glBuffer a)
{
	glBuffer tmp = vec->a[i];
	vec->a[i] = a;
	return tmp;
}

void cvec_erase_glBuffer(cvector_glBuffer* vec, size_t start, size_t end)
{
	size_t d = end - start + 1;
	CVEC_MEMMOVE(&vec->a[start], &vec->a[end+1], (vec->size-1-end)*sizeof(glBuffer));
	vec->size -= d;
}


int cvec_reserve_glBuffer(cvector_glBuffer* vec, size_t size)
{
	glBuffer* tmp;
	if (vec->capacity < size) {
		if (!(tmp = (glBuffer*)CVEC_REALLOC(vec->a, sizeof(glBuffer)*(size+CVEC_glBuffer_SZ)))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = size + CVEC_glBuffer_SZ;
	}
	return 1;
}

int cvec_set_cap_glBuffer(cvector_glBuffer* vec, size_t size)
{
	glBuffer* tmp;
	if (size < vec->size) {
		vec->size = size;
	}

	if (!(tmp = (glBuffer*)CVEC_REALLOC(vec->a, sizeof(glBuffer)*size))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	vec->a = tmp;
	vec->capacity = size;
	return 1;
}

void cvec_set_val_sz_glBuffer(cvector_glBuffer* vec, glBuffer val)
{
	size_t i;
	for (i=0; i<vec->size; i++) {
		vec->a[i] = val;
	}
}

void cvec_set_val_cap_glBuffer(cvector_glBuffer* vec, glBuffer val)
{
	size_t i;
	for (i=0; i<vec->capacity; i++) {
		vec->a[i] = val;
	}
}

void cvec_clear_glBuffer(cvector_glBuffer* vec) { vec->size = 0; }

void cvec_free_glBuffer_heap(void* vec)
{
	cvector_glBuffer* tmp = (cvector_glBuffer*)vec;
	if (!tmp) return;
	CVEC_FREE(tmp->a);
	CVEC_FREE(tmp);
}

void cvec_free_glBuffer(void* vec)
{
	cvector_glBuffer* tmp = (cvector_glBuffer*)vec;
	CVEC_FREE(tmp->a);
	tmp->size = 0;
	tmp->capacity = 0;
}

#endif
#ifndef CVECTOR_glTexture_H
#define CVECTOR_glTexture_H

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Data structure for glTexture vector. */
typedef struct cvector_glTexture
{
	glTexture* a;           /**< Array. */
	size_t size;       /**< Current size (amount you use when manipulating array directly). */
	size_t capacity;   /**< Allocated size of array; always >= size. */
} cvector_glTexture;



extern size_t CVEC_glTexture_SZ;

int cvec_glTexture(cvector_glTexture* vec, size_t size, size_t capacity);
int cvec_init_glTexture(cvector_glTexture* vec, glTexture* vals, size_t num);

cvector_glTexture* cvec_glTexture_heap(size_t size, size_t capacity);
cvector_glTexture* cvec_init_glTexture_heap(glTexture* vals, size_t num);
int cvec_copyc_glTexture(void* dest, void* src);
int cvec_copy_glTexture(cvector_glTexture* dest, cvector_glTexture* src);

int cvec_push_glTexture(cvector_glTexture* vec, glTexture a);
glTexture cvec_pop_glTexture(cvector_glTexture* vec);

int cvec_extend_glTexture(cvector_glTexture* vec, size_t num);
int cvec_insert_glTexture(cvector_glTexture* vec, size_t i, glTexture a);
int cvec_insert_array_glTexture(cvector_glTexture* vec, size_t i, glTexture* a, size_t num);
glTexture cvec_replace_glTexture(cvector_glTexture* vec, size_t i, glTexture a);
void cvec_erase_glTexture(cvector_glTexture* vec, size_t start, size_t end);
int cvec_reserve_glTexture(cvector_glTexture* vec, size_t size);
int cvec_set_cap_glTexture(cvector_glTexture* vec, size_t size);
void cvec_set_val_sz_glTexture(cvector_glTexture* vec, glTexture val);
void cvec_set_val_cap_glTexture(cvector_glTexture* vec, glTexture val);

glTexture* cvec_back_glTexture(cvector_glTexture* vec);

void cvec_clear_glTexture(cvector_glTexture* vec);
void cvec_free_glTexture_heap(void* vec);
void cvec_free_glTexture(void* vec);

#ifdef __cplusplus
}
#endif

/* CVECTOR_glTexture_H */
#endif


#ifdef CVECTOR_glTexture_IMPLEMENTATION

size_t CVEC_glTexture_SZ = 50;

#define CVEC_glTexture_ALLOCATOR(x) ((x+1) * 2)


#if defined(CVEC_MALLOC) && defined(CVEC_FREE) && defined(CVEC_REALLOC)
/* ok */
#elif !defined(CVEC_MALLOC) && !defined(CVEC_FREE) && !defined(CVEC_REALLOC)
/* ok */
#else
#error "Must define all or none of CVEC_MALLOC, CVEC_FREE, and CVEC_REALLOC."
#endif

#ifndef CVEC_MALLOC
#define CVEC_MALLOC(sz)      malloc(sz)
#define CVEC_REALLOC(p, sz)  realloc(p, sz)
#define CVEC_FREE(p)         free(p)
#endif

#ifndef CVEC_MEMMOVE
#include <string.h>
#define CVEC_MEMMOVE(dst, src, sz)  memmove(dst, src, sz)
#endif

#ifndef CVEC_ASSERT
#include <assert.h>
#define CVEC_ASSERT(x)       assert(x)
#endif

cvector_glTexture* cvec_glTexture_heap(size_t size, size_t capacity)
{
	cvector_glTexture* vec;
	if (!(vec = (cvector_glTexture*)CVEC_MALLOC(sizeof(cvector_glTexture)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glTexture_SZ;

	if (!(vec->a = (glTexture*)CVEC_MALLOC(vec->capacity*sizeof(glTexture)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	return vec;
}

cvector_glTexture* cvec_init_glTexture_heap(glTexture* vals, size_t num)
{
	cvector_glTexture* vec;
	
	if (!(vec = (cvector_glTexture*)CVEC_MALLOC(sizeof(cvector_glTexture)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->capacity = num + CVEC_glTexture_SZ;
	vec->size = num;
	if (!(vec->a = (glTexture*)CVEC_MALLOC(vec->capacity*sizeof(glTexture)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glTexture)*num);

	return vec;
}

int cvec_glTexture(cvector_glTexture* vec, size_t size, size_t capacity)
{
	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glTexture_SZ;

	if (!(vec->a = (glTexture*)CVEC_MALLOC(vec->capacity*sizeof(glTexture)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	return 1;
}

int cvec_init_glTexture(cvector_glTexture* vec, glTexture* vals, size_t num)
{
	vec->capacity = num + CVEC_glTexture_SZ;
	vec->size = num;
	if (!(vec->a = (glTexture*)CVEC_MALLOC(vec->capacity*sizeof(glTexture)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glTexture)*num);

	return 1;
}

int cvec_copyc_glTexture(void* dest, void* src)
{
	cvector_glTexture* vec1 = (cvector_glTexture*)dest;
	cvector_glTexture* vec2 = (cvector_glTexture*)src;

	vec1->a = NULL;
	vec1->size = 0;
	vec1->capacity = 0;

	return cvec_copy_glTexture(vec1, vec2);
}

int cvec_copy_glTexture(cvector_glTexture* dest, cvector_glTexture* src)
{
	glTexture* tmp = NULL;
	if (!(tmp = (glTexture*)CVEC_REALLOC(dest->a, src->capacity*sizeof(glTexture)))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	dest->a = tmp;

	CVEC_MEMMOVE(dest->a, src->a, src->size*sizeof(glTexture));
	dest->size = src->size;
	dest->capacity = src->capacity;
	return 1;
}


int cvec_push_glTexture(cvector_glTexture* vec, glTexture a)
{
	glTexture* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		vec->a[vec->size++] = a;
	} else {
		tmp_sz = CVEC_glTexture_ALLOCATOR(vec->capacity);
		if (!(tmp = (glTexture*)CVEC_REALLOC(vec->a, sizeof(glTexture)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->a[vec->size++] = a;
		vec->capacity = tmp_sz;
	}
	return 1;
}

glTexture cvec_pop_glTexture(cvector_glTexture* vec)
{
	return vec->a[--vec->size];
}

glTexture* cvec_back_glTexture(cvector_glTexture* vec)
{
	return &vec->a[vec->size-1];
}

int cvec_extend_glTexture(cvector_glTexture* vec, size_t num)
{
	glTexture* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glTexture_SZ;
		if (!(tmp = (glTexture*)CVEC_REALLOC(vec->a, sizeof(glTexture)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	vec->size += num;
	return 1;
}

int cvec_insert_glTexture(cvector_glTexture* vec, size_t i, glTexture a)
{
	glTexture* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glTexture));
		vec->a[i] = a;
	} else {
		tmp_sz = CVEC_glTexture_ALLOCATOR(vec->capacity);
		if (!(tmp = (glTexture*)CVEC_REALLOC(vec->a, sizeof(glTexture)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glTexture));
		vec->a[i] = a;
		vec->capacity = tmp_sz;
	}

	vec->size++;
	return 1;
}

int cvec_insert_array_glTexture(cvector_glTexture* vec, size_t i, glTexture* a, size_t num)
{
	glTexture* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glTexture_SZ;
		if (!(tmp = (glTexture*)CVEC_REALLOC(vec->a, sizeof(glTexture)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	CVEC_MEMMOVE(&vec->a[i+num], &vec->a[i], (vec->size-i)*sizeof(glTexture));
	CVEC_MEMMOVE(&vec->a[i], a, num*sizeof(glTexture));
	vec->size += num;
	return 1;
}

glTexture cvec_replace_glTexture(cvector_glTexture* vec, size_t i, glTexture a)
{
	glTexture tmp = vec->a[i];
	vec->a[i] = a;
	return tmp;
}

void cvec_erase_glTexture(cvector_glTexture* vec, size_t start, size_t end)
{
	size_t d = end - start + 1;
	CVEC_MEMMOVE(&vec->a[start], &vec->a[end+1], (vec->size-1-end)*sizeof(glTexture));
	vec->size -= d;
}


int cvec_reserve_glTexture(cvector_glTexture* vec, size_t size)
{
	glTexture* tmp;
	if (vec->capacity < size) {
		if (!(tmp = (glTexture*)CVEC_REALLOC(vec->a, sizeof(glTexture)*(size+CVEC_glTexture_SZ)))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = size + CVEC_glTexture_SZ;
	}
	return 1;
}

int cvec_set_cap_glTexture(cvector_glTexture* vec, size_t size)
{
	glTexture* tmp;
	if (size < vec->size) {
		vec->size = size;
	}

	if (!(tmp = (glTexture*)CVEC_REALLOC(vec->a, sizeof(glTexture)*size))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	vec->a = tmp;
	vec->capacity = size;
	return 1;
}

void cvec_set_val_sz_glTexture(cvector_glTexture* vec, glTexture val)
{
	size_t i;
	for (i=0; i<vec->size; i++) {
		vec->a[i] = val;
	}
}

void cvec_set_val_cap_glTexture(cvector_glTexture* vec, glTexture val)
{
	size_t i;
	for (i=0; i<vec->capacity; i++) {
		vec->a[i] = val;
	}
}

void cvec_clear_glTexture(cvector_glTexture* vec) { vec->size = 0; }

void cvec_free_glTexture_heap(void* vec)
{
	cvector_glTexture* tmp = (cvector_glTexture*)vec;
	if (!tmp) return;
	CVEC_FREE(tmp->a);
	CVEC_FREE(tmp);
}

void cvec_free_glTexture(void* vec)
{
	cvector_glTexture* tmp = (cvector_glTexture*)vec;
	CVEC_FREE(tmp->a);
	tmp->size = 0;
	tmp->capacity = 0;
}

#endif
#ifndef CVECTOR_glProgram_H
#define CVECTOR_glProgram_H

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Data structure for glProgram vector. */
typedef struct cvector_glProgram
{
	glProgram* a;           /**< Array. */
	size_t size;       /**< Current size (amount you use when manipulating array directly). */
	size_t capacity;   /**< Allocated size of array; always >= size. */
} cvector_glProgram;



extern size_t CVEC_glProgram_SZ;

int cvec_glProgram(cvector_glProgram* vec, size_t size, size_t capacity);
int cvec_init_glProgram(cvector_glProgram* vec, glProgram* vals, size_t num);

cvector_glProgram* cvec_glProgram_heap(size_t size, size_t capacity);
cvector_glProgram* cvec_init_glProgram_heap(glProgram* vals, size_t num);
int cvec_copyc_glProgram(void* dest, void* src);
int cvec_copy_glProgram(cvector_glProgram* dest, cvector_glProgram* src);

int cvec_push_glProgram(cvector_glProgram* vec, glProgram a);
glProgram cvec_pop_glProgram(cvector_glProgram* vec);

int cvec_extend_glProgram(cvector_glProgram* vec, size_t num);
int cvec_insert_glProgram(cvector_glProgram* vec, size_t i, glProgram a);
int cvec_insert_array_glProgram(cvector_glProgram* vec, size_t i, glProgram* a, size_t num);
glProgram cvec_replace_glProgram(cvector_glProgram* vec, size_t i, glProgram a);
void cvec_erase_glProgram(cvector_glProgram* vec, size_t start, size_t end);
int cvec_reserve_glProgram(cvector_glProgram* vec, size_t size);
int cvec_set_cap_glProgram(cvector_glProgram* vec, size_t size);
void cvec_set_val_sz_glProgram(cvector_glProgram* vec, glProgram val);
void cvec_set_val_cap_glProgram(cvector_glProgram* vec, glProgram val);

glProgram* cvec_back_glProgram(cvector_glProgram* vec);

void cvec_clear_glProgram(cvector_glProgram* vec);
void cvec_free_glProgram_heap(void* vec);
void cvec_free_glProgram(void* vec);

#ifdef __cplusplus
}
#endif

/* CVECTOR_glProgram_H */
#endif


#ifdef CVECTOR_glProgram_IMPLEMENTATION

size_t CVEC_glProgram_SZ = 50;

#define CVEC_glProgram_ALLOCATOR(x) ((x+1) * 2)


#if defined(CVEC_MALLOC) && defined(CVEC_FREE) && defined(CVEC_REALLOC)
/* ok */
#elif !defined(CVEC_MALLOC) && !defined(CVEC_FREE) && !defined(CVEC_REALLOC)
/* ok */
#else
#error "Must define all or none of CVEC_MALLOC, CVEC_FREE, and CVEC_REALLOC."
#endif

#ifndef CVEC_MALLOC
#define CVEC_MALLOC(sz)      malloc(sz)
#define CVEC_REALLOC(p, sz)  realloc(p, sz)
#define CVEC_FREE(p)         free(p)
#endif

#ifndef CVEC_MEMMOVE
#include <string.h>
#define CVEC_MEMMOVE(dst, src, sz)  memmove(dst, src, sz)
#endif

#ifndef CVEC_ASSERT
#include <assert.h>
#define CVEC_ASSERT(x)       assert(x)
#endif

cvector_glProgram* cvec_glProgram_heap(size_t size, size_t capacity)
{
	cvector_glProgram* vec;
	if (!(vec = (cvector_glProgram*)CVEC_MALLOC(sizeof(cvector_glProgram)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glProgram_SZ;

	if (!(vec->a = (glProgram*)CVEC_MALLOC(vec->capacity*sizeof(glProgram)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	return vec;
}

cvector_glProgram* cvec_init_glProgram_heap(glProgram* vals, size_t num)
{
	cvector_glProgram* vec;
	
	if (!(vec = (cvector_glProgram*)CVEC_MALLOC(sizeof(cvector_glProgram)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->capacity = num + CVEC_glProgram_SZ;
	vec->size = num;
	if (!(vec->a = (glProgram*)CVEC_MALLOC(vec->capacity*sizeof(glProgram)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glProgram)*num);

	return vec;
}

int cvec_glProgram(cvector_glProgram* vec, size_t size, size_t capacity)
{
	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glProgram_SZ;

	if (!(vec->a = (glProgram*)CVEC_MALLOC(vec->capacity*sizeof(glProgram)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	return 1;
}

int cvec_init_glProgram(cvector_glProgram* vec, glProgram* vals, size_t num)
{
	vec->capacity = num + CVEC_glProgram_SZ;
	vec->size = num;
	if (!(vec->a = (glProgram*)CVEC_MALLOC(vec->capacity*sizeof(glProgram)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glProgram)*num);

	return 1;
}

int cvec_copyc_glProgram(void* dest, void* src)
{
	cvector_glProgram* vec1 = (cvector_glProgram*)dest;
	cvector_glProgram* vec2 = (cvector_glProgram*)src;

	vec1->a = NULL;
	vec1->size = 0;
	vec1->capacity = 0;

	return cvec_copy_glProgram(vec1, vec2);
}

int cvec_copy_glProgram(cvector_glProgram* dest, cvector_glProgram* src)
{
	glProgram* tmp = NULL;
	if (!(tmp = (glProgram*)CVEC_REALLOC(dest->a, src->capacity*sizeof(glProgram)))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	dest->a = tmp;

	CVEC_MEMMOVE(dest->a, src->a, src->size*sizeof(glProgram));
	dest->size = src->size;
	dest->capacity = src->capacity;
	return 1;
}


int cvec_push_glProgram(cvector_glProgram* vec, glProgram a)
{
	glProgram* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		vec->a[vec->size++] = a;
	} else {
		tmp_sz = CVEC_glProgram_ALLOCATOR(vec->capacity);
		if (!(tmp = (glProgram*)CVEC_REALLOC(vec->a, sizeof(glProgram)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->a[vec->size++] = a;
		vec->capacity = tmp_sz;
	}
	return 1;
}

glProgram cvec_pop_glProgram(cvector_glProgram* vec)
{
	return vec->a[--vec->size];
}

glProgram* cvec_back_glProgram(cvector_glProgram* vec)
{
	return &vec->a[vec->size-1];
}

int cvec_extend_glProgram(cvector_glProgram* vec, size_t num)
{
	glProgram* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glProgram_SZ;
		if (!(tmp = (glProgram*)CVEC_REALLOC(vec->a, sizeof(glProgram)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	vec->size += num;
	return 1;
}

int cvec_insert_glProgram(cvector_glProgram* vec, size_t i, glProgram a)
{
	glProgram* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glProgram));
		vec->a[i] = a;
	} else {
		tmp_sz = CVEC_glProgram_ALLOCATOR(vec->capacity);
		if (!(tmp = (glProgram*)CVEC_REALLOC(vec->a, sizeof(glProgram)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glProgram));
		vec->a[i] = a;
		vec->capacity = tmp_sz;
	}

	vec->size++;
	return 1;
}

int cvec_insert_array_glProgram(cvector_glProgram* vec, size_t i, glProgram* a, size_t num)
{
	glProgram* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glProgram_SZ;
		if (!(tmp = (glProgram*)CVEC_REALLOC(vec->a, sizeof(glProgram)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	CVEC_MEMMOVE(&vec->a[i+num], &vec->a[i], (vec->size-i)*sizeof(glProgram));
	CVEC_MEMMOVE(&vec->a[i], a, num*sizeof(glProgram));
	vec->size += num;
	return 1;
}

glProgram cvec_replace_glProgram(cvector_glProgram* vec, size_t i, glProgram a)
{
	glProgram tmp = vec->a[i];
	vec->a[i] = a;
	return tmp;
}

void cvec_erase_glProgram(cvector_glProgram* vec, size_t start, size_t end)
{
	size_t d = end - start + 1;
	CVEC_MEMMOVE(&vec->a[start], &vec->a[end+1], (vec->size-1-end)*sizeof(glProgram));
	vec->size -= d;
}


int cvec_reserve_glProgram(cvector_glProgram* vec, size_t size)
{
	glProgram* tmp;
	if (vec->capacity < size) {
		if (!(tmp = (glProgram*)CVEC_REALLOC(vec->a, sizeof(glProgram)*(size+CVEC_glProgram_SZ)))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = size + CVEC_glProgram_SZ;
	}
	return 1;
}

int cvec_set_cap_glProgram(cvector_glProgram* vec, size_t size)
{
	glProgram* tmp;
	if (size < vec->size) {
		vec->size = size;
	}

	if (!(tmp = (glProgram*)CVEC_REALLOC(vec->a, sizeof(glProgram)*size))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	vec->a = tmp;
	vec->capacity = size;
	return 1;
}

void cvec_set_val_sz_glProgram(cvector_glProgram* vec, glProgram val)
{
	size_t i;
	for (i=0; i<vec->size; i++) {
		vec->a[i] = val;
	}
}

void cvec_set_val_cap_glProgram(cvector_glProgram* vec, glProgram val)
{
	size_t i;
	for (i=0; i<vec->capacity; i++) {
		vec->a[i] = val;
	}
}

void cvec_clear_glProgram(cvector_glProgram* vec) { vec->size = 0; }

void cvec_free_glProgram_heap(void* vec)
{
	cvector_glProgram* tmp = (cvector_glProgram*)vec;
	if (!tmp) return;
	CVEC_FREE(tmp->a);
	CVEC_FREE(tmp);
}

void cvec_free_glProgram(void* vec)
{
	cvector_glProgram* tmp = (cvector_glProgram*)vec;
	CVEC_FREE(tmp->a);
	tmp->size = 0;
	tmp->capacity = 0;
}

#endif
#ifndef CVECTOR_glVertex_H
#define CVECTOR_glVertex_H

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Data structure for glVertex vector. */
typedef struct cvector_glVertex
{
	glVertex* a;           /**< Array. */
	size_t size;       /**< Current size (amount you use when manipulating array directly). */
	size_t capacity;   /**< Allocated size of array; always >= size. */
} cvector_glVertex;



extern size_t CVEC_glVertex_SZ;

int cvec_glVertex(cvector_glVertex* vec, size_t size, size_t capacity);
int cvec_init_glVertex(cvector_glVertex* vec, glVertex* vals, size_t num);

cvector_glVertex* cvec_glVertex_heap(size_t size, size_t capacity);
cvector_glVertex* cvec_init_glVertex_heap(glVertex* vals, size_t num);
int cvec_copyc_glVertex(void* dest, void* src);
int cvec_copy_glVertex(cvector_glVertex* dest, cvector_glVertex* src);

int cvec_push_glVertex(cvector_glVertex* vec, glVertex a);
glVertex cvec_pop_glVertex(cvector_glVertex* vec);

int cvec_extend_glVertex(cvector_glVertex* vec, size_t num);
int cvec_insert_glVertex(cvector_glVertex* vec, size_t i, glVertex a);
int cvec_insert_array_glVertex(cvector_glVertex* vec, size_t i, glVertex* a, size_t num);
glVertex cvec_replace_glVertex(cvector_glVertex* vec, size_t i, glVertex a);
void cvec_erase_glVertex(cvector_glVertex* vec, size_t start, size_t end);
int cvec_reserve_glVertex(cvector_glVertex* vec, size_t size);
int cvec_set_cap_glVertex(cvector_glVertex* vec, size_t size);
void cvec_set_val_sz_glVertex(cvector_glVertex* vec, glVertex val);
void cvec_set_val_cap_glVertex(cvector_glVertex* vec, glVertex val);

glVertex* cvec_back_glVertex(cvector_glVertex* vec);

void cvec_clear_glVertex(cvector_glVertex* vec);
void cvec_free_glVertex_heap(void* vec);
void cvec_free_glVertex(void* vec);

#ifdef __cplusplus
}
#endif

/* CVECTOR_glVertex_H */
#endif


#ifdef CVECTOR_glVertex_IMPLEMENTATION

size_t CVEC_glVertex_SZ = 50;

#define CVEC_glVertex_ALLOCATOR(x) ((x+1) * 2)


#if defined(CVEC_MALLOC) && defined(CVEC_FREE) && defined(CVEC_REALLOC)
/* ok */
#elif !defined(CVEC_MALLOC) && !defined(CVEC_FREE) && !defined(CVEC_REALLOC)
/* ok */
#else
#error "Must define all or none of CVEC_MALLOC, CVEC_FREE, and CVEC_REALLOC."
#endif

#ifndef CVEC_MALLOC
#define CVEC_MALLOC(sz)      malloc(sz)
#define CVEC_REALLOC(p, sz)  realloc(p, sz)
#define CVEC_FREE(p)         free(p)
#endif

#ifndef CVEC_MEMMOVE
#include <string.h>
#define CVEC_MEMMOVE(dst, src, sz)  memmove(dst, src, sz)
#endif

#ifndef CVEC_ASSERT
#include <assert.h>
#define CVEC_ASSERT(x)       assert(x)
#endif

cvector_glVertex* cvec_glVertex_heap(size_t size, size_t capacity)
{
	cvector_glVertex* vec;
	if (!(vec = (cvector_glVertex*)CVEC_MALLOC(sizeof(cvector_glVertex)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glVertex_SZ;

	if (!(vec->a = (glVertex*)CVEC_MALLOC(vec->capacity*sizeof(glVertex)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	return vec;
}

cvector_glVertex* cvec_init_glVertex_heap(glVertex* vals, size_t num)
{
	cvector_glVertex* vec;
	
	if (!(vec = (cvector_glVertex*)CVEC_MALLOC(sizeof(cvector_glVertex)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->capacity = num + CVEC_glVertex_SZ;
	vec->size = num;
	if (!(vec->a = (glVertex*)CVEC_MALLOC(vec->capacity*sizeof(glVertex)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glVertex)*num);

	return vec;
}

int cvec_glVertex(cvector_glVertex* vec, size_t size, size_t capacity)
{
	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glVertex_SZ;

	if (!(vec->a = (glVertex*)CVEC_MALLOC(vec->capacity*sizeof(glVertex)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	return 1;
}

int cvec_init_glVertex(cvector_glVertex* vec, glVertex* vals, size_t num)
{
	vec->capacity = num + CVEC_glVertex_SZ;
	vec->size = num;
	if (!(vec->a = (glVertex*)CVEC_MALLOC(vec->capacity*sizeof(glVertex)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glVertex)*num);

	return 1;
}

int cvec_copyc_glVertex(void* dest, void* src)
{
	cvector_glVertex* vec1 = (cvector_glVertex*)dest;
	cvector_glVertex* vec2 = (cvector_glVertex*)src;

	vec1->a = NULL;
	vec1->size = 0;
	vec1->capacity = 0;

	return cvec_copy_glVertex(vec1, vec2);
}

int cvec_copy_glVertex(cvector_glVertex* dest, cvector_glVertex* src)
{
	glVertex* tmp = NULL;
	if (!(tmp = (glVertex*)CVEC_REALLOC(dest->a, src->capacity*sizeof(glVertex)))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	dest->a = tmp;

	CVEC_MEMMOVE(dest->a, src->a, src->size*sizeof(glVertex));
	dest->size = src->size;
	dest->capacity = src->capacity;
	return 1;
}


int cvec_push_glVertex(cvector_glVertex* vec, glVertex a)
{
	glVertex* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		vec->a[vec->size++] = a;
	} else {
		tmp_sz = CVEC_glVertex_ALLOCATOR(vec->capacity);
		if (!(tmp = (glVertex*)CVEC_REALLOC(vec->a, sizeof(glVertex)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->a[vec->size++] = a;
		vec->capacity = tmp_sz;
	}
	return 1;
}

glVertex cvec_pop_glVertex(cvector_glVertex* vec)
{
	return vec->a[--vec->size];
}

glVertex* cvec_back_glVertex(cvector_glVertex* vec)
{
	return &vec->a[vec->size-1];
}

int cvec_extend_glVertex(cvector_glVertex* vec, size_t num)
{
	glVertex* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glVertex_SZ;
		if (!(tmp = (glVertex*)CVEC_REALLOC(vec->a, sizeof(glVertex)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	vec->size += num;
	return 1;
}

int cvec_insert_glVertex(cvector_glVertex* vec, size_t i, glVertex a)
{
	glVertex* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glVertex));
		vec->a[i] = a;
	} else {
		tmp_sz = CVEC_glVertex_ALLOCATOR(vec->capacity);
		if (!(tmp = (glVertex*)CVEC_REALLOC(vec->a, sizeof(glVertex)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glVertex));
		vec->a[i] = a;
		vec->capacity = tmp_sz;
	}

	vec->size++;
	return 1;
}

int cvec_insert_array_glVertex(cvector_glVertex* vec, size_t i, glVertex* a, size_t num)
{
	glVertex* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glVertex_SZ;
		if (!(tmp = (glVertex*)CVEC_REALLOC(vec->a, sizeof(glVertex)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	CVEC_MEMMOVE(&vec->a[i+num], &vec->a[i], (vec->size-i)*sizeof(glVertex));
	CVEC_MEMMOVE(&vec->a[i], a, num*sizeof(glVertex));
	vec->size += num;
	return 1;
}

glVertex cvec_replace_glVertex(cvector_glVertex* vec, size_t i, glVertex a)
{
	glVertex tmp = vec->a[i];
	vec->a[i] = a;
	return tmp;
}

void cvec_erase_glVertex(cvector_glVertex* vec, size_t start, size_t end)
{
	size_t d = end - start + 1;
	CVEC_MEMMOVE(&vec->a[start], &vec->a[end+1], (vec->size-1-end)*sizeof(glVertex));
	vec->size -= d;
}


int cvec_reserve_glVertex(cvector_glVertex* vec, size_t size)
{
	glVertex* tmp;
	if (vec->capacity < size) {
		if (!(tmp = (glVertex*)CVEC_REALLOC(vec->a, sizeof(glVertex)*(size+CVEC_glVertex_SZ)))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = size + CVEC_glVertex_SZ;
	}
	return 1;
}

int cvec_set_cap_glVertex(cvector_glVertex* vec, size_t size)
{
	glVertex* tmp;
	if (size < vec->size) {
		vec->size = size;
	}

	if (!(tmp = (glVertex*)CVEC_REALLOC(vec->a, sizeof(glVertex)*size))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	vec->a = tmp;
	vec->capacity = size;
	return 1;
}

void cvec_set_val_sz_glVertex(cvector_glVertex* vec, glVertex val)
{
	size_t i;
	for (i=0; i<vec->size; i++) {
		vec->a[i] = val;
	}
}

void cvec_set_val_cap_glVertex(cvector_glVertex* vec, glVertex val)
{
	size_t i;
	for (i=0; i<vec->capacity; i++) {
		vec->a[i] = val;
	}
}

void cvec_clear_glVertex(cvector_glVertex* vec) { vec->size = 0; }

void cvec_free_glVertex_heap(void* vec)
{
	cvector_glVertex* tmp = (cvector_glVertex*)vec;
	if (!tmp) return;
	CVEC_FREE(tmp->a);
	CVEC_FREE(tmp);
}

void cvec_free_glVertex(void* vec)
{
	cvector_glVertex* tmp = (cvector_glVertex*)vec;
	CVEC_FREE(tmp->a);
	tmp->size = 0;
	tmp->capacity = 0;
}

#endif

typedef struct glContext
{
	mat4 vp_mat;

	int x_min, y_min;
	size_t x_max, y_max;

	cvector_glVertex_Array vertex_arrays;
	cvector_glBuffer buffers;
	cvector_glTexture textures;
	cvector_glProgram programs;

	GLuint cur_vertex_array;
	GLuint bound_buffers[GL_NUM_BUFFER_TYPES-GL_ARRAY_BUFFER];
	GLuint bound_textures[GL_NUM_TEXTURE_TYPES-GL_TEXTURE_UNBOUND-1];
	GLuint cur_texture2D;
	GLuint cur_program;

	GLenum error;

	void* uniform;

	vec4 vertex_attribs_vs[GL_MAX_VERTEX_ATTRIBS];
	Shader_Builtins builtins;
	Vertex_Shader_output vs_output;
	float fs_input[GL_MAX_VERTEX_OUTPUT_COMPONENTS];

	GLboolean depth_test;
	GLboolean line_smooth;
	GLboolean cull_face;
	GLboolean fragdepth_or_discard;
	GLboolean depth_clamp;
	GLboolean depth_mask;
	GLboolean blend;
	GLboolean logic_ops;
	GLboolean poly_offset;
	GLboolean scissor_test;

	// stencil test requires a lot of state, especially for
	// something that I think will rarely be used... is it even worth having?
	GLboolean stencil_test;
	GLuint stencil_writemask;
	GLuint stencil_writemask_back;
	GLint stencil_ref;
	GLint stencil_ref_back;
	GLuint stencil_valuemask;
	GLuint stencil_valuemask_back;
	GLenum stencil_func;
	GLenum stencil_func_back;
	GLenum stencil_sfail;
	GLenum stencil_dpfail;
	GLenum stencil_dppass;
	GLenum stencil_sfail_back;
	GLenum stencil_dpfail_back;
	GLenum stencil_dppass_back;

	GLenum logic_func;
	GLenum blend_sfactor;
	GLenum blend_dfactor;
	GLenum blend_equation;
	GLenum cull_mode;
	GLenum front_face;
	GLenum poly_mode_front;
	GLenum poly_mode_back;
	GLenum depth_func;
	GLenum point_spr_origin;
	GLenum provoking_vert;

	// I really need to decide whether to use GLtypes or plain C types
	GLfloat poly_factor;
	GLfloat poly_units;

	GLint scissor_lx;
	GLint scissor_ly;
	GLsizei scissor_ux;
	GLsizei scissor_uy;

	GLint unpack_alignment;
	GLint pack_alignment;

	GLint clear_stencil;
	Color clear_color;
	vec4 blend_color;
	GLfloat point_size;
	GLfloat clear_depth;
	GLfloat depth_range_near;
	GLfloat depth_range_far;

	draw_triangle_func draw_triangle_front;
	draw_triangle_func draw_triangle_back;

	glFramebuffer zbuf;
	glFramebuffer back_buffer;
	glFramebuffer stencil_buf;

	int user_alloced_backbuf;
	int bitdepth;
	u32 Rmask;
	u32 Gmask;
	u32 Bmask;
	u32 Amask;
	int Rshift;
	int Gshift;
	int Bshift;
	int Ashift;
	


	cvector_glVertex glverts;
} glContext;




/*************************************
 *  GLSL(ish) functions
 *************************************/

float clampf_01(float f);
float clampf(float f, float min, float max);
int clampi(int i, int min, int max);

//shader texture functions
vec4 texture1D(GLuint tex, float x);
vec4 texture2D(GLuint tex, float x, float y);
vec4 texture3D(GLuint tex, float x, float y, float z);
vec4 texture2DArray(GLuint tex, float x, float y, int z);
vec4 texture_rect(GLuint tex, float x, float y);
vec4 texture_cubemap(GLuint texture, float x, float y, float z);






// TODO leave these non gl* functions here?  prefix with pgl?
int init_glContext(glContext* c, u32** back_buffer, int w, int h, int bitdepth, u32 Rmask, u32 Gmask, u32 Bmask, u32 Amask);
void free_glContext(glContext* context);
void set_glContext(glContext* context);

void* pglResizeFramebuffer(size_t w, size_t h);

void glViewport(int x, int y, GLsizei width, GLsizei height);


GLubyte* glGetString(GLenum name);
GLenum glGetError();
void glGetBooleanv(GLenum pname, GLboolean* params);
void glGetDoublev(GLenum pname, GLdouble* params);
void glGetFloatv(GLenum pname, GLfloat* params);
void glGetIntegerv(GLenum pname, GLint* params);
void glGetInteger64v(GLenum pname, GLint64* params);
GLboolean glIsEnabled(GLenum cap);

void glClearColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
void glClearDepth(GLclampf depth);
void glDepthFunc(GLenum func);
void glDepthRange(GLclampf nearVal, GLclampf farVal);
void glDepthMask(GLboolean flag);
void glBlendFunc(GLenum sfactor, GLenum dfactor);
void glBlendEquation(GLenum mode);
void glBlendColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
void glClear(GLbitfield mask);
void glProvokingVertex(GLenum provokeMode);
void glEnable(GLenum cap);
void glDisable(GLenum cap);
void glCullFace(GLenum mode);
void glFrontFace(GLenum mode);
void glPolygonMode(GLenum face, GLenum mode);
void glPointSize(GLfloat size);
void glPointParameteri(GLenum pname, GLint param);
void glLineWidth(GLfloat width);
void glLogicOp(GLenum opcode);
void glPolygonOffset(GLfloat factor, GLfloat units);
void glScissor(GLint x, GLint y, GLsizei width, GLsizei height);
void glStencilFunc(GLenum func, GLint ref, GLuint mask);
void glStencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask);
void glStencilOp(GLenum sfail, GLenum dpfail, GLenum dppass);
void glStencilOpSeparate(GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass);
void glClearStencil(GLint s);
void glStencilMask(GLuint mask);
void glStencilMaskSeparate(GLenum face, GLuint mask);

//textures
void glGenTextures(GLsizei n, GLuint* textures);
void glDeleteTextures(GLsizei n, GLuint* textures);
void glBindTexture(GLenum target, GLuint texture);

void glActiveTexture(GLenum texture);
void glTexParameteri(GLenum target, GLenum pname, GLint param);
void glTexParameterfv(GLenum target, GLenum pname, const GLfloat* params);
void glPixelStorei(GLenum pname, GLint param);
void glTexImage1D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLint border, GLenum format, GLenum type, const GLvoid* data);
void glTexImage2D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid* data);
void glTexImage3D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, const GLvoid* data);

void glTexSubImage1D(GLenum target, GLint level, GLint xoffset, GLsizei width, GLenum format, GLenum type, const GLvoid* data);
void glTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid* data);
void glTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const GLvoid* data);


void glGenVertexArrays(GLsizei n, GLuint* arrays);
void glDeleteVertexArrays(GLsizei n, const GLuint* arrays);
void glBindVertexArray(GLuint array);
void glGenBuffers(GLsizei n, GLuint* buffers);
void glDeleteBuffers(GLsizei n, const GLuint* buffers);
void glBindBuffer(GLenum target, GLuint buffer);
void glBufferData(GLenum target, GLsizei size, const GLvoid* data, GLenum usage);
void glBufferSubData(GLenum target, GLsizei offset, GLsizei size, const GLvoid* data);
void glVertexAttribPointer(GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, GLsizei offset);
void glVertexAttribDivisor(GLuint index, GLuint divisor);
void glEnableVertexAttribArray(GLuint index);
void glDisableVertexAttribArray(GLuint index);
void glDrawArrays(GLenum mode, GLint first, GLsizei count);
void glDrawElements(GLenum mode, GLsizei count, GLenum type, GLsizei offset);
void glDrawArraysInstanced(GLenum mode, GLint first, GLsizei count, GLsizei primcount);
void glDrawArraysInstancedBaseInstance(GLenum mode, GLint first, GLsizei count, GLsizei primcount, GLuint baseinstance);
void glDrawElementsInstanced(GLenum mode, GLsizei count, GLenum type, GLsizei offset, GLsizei primcount);
void glDrawElementsInstancedBaseInstance(GLenum mode, GLsizei count, GLenum type, GLsizei offset, GLsizei primcount, GLuint baseinstance);


//shaders
GLuint pglCreateProgram(vert_func vertex_shader, frag_func fragment_shader, GLsizei n, GLenum* interpolation, GLboolean fragdepth_or_discard);
void glDeleteProgram(GLuint program);
void glUseProgram(GLuint program);

void pglSetUniform(void* uniform);


// Stubs to let real OpenGL libs compile with minimal modifications/ifdefs
// add what you need
void glGenerateMipmap(GLenum target);


void glGetProgramiv(GLuint program, GLenum pname, GLint* params);
void glGetProgramInfoLog(GLuint program, GLsizei maxLength, GLsizei* length, GLchar* infoLog);
void glAttachShader(GLuint program, GLuint shader);
void glCompileShader(GLuint shader);
void glGetShaderInfoLog(GLuint shader, GLsizei maxLength, GLsizei* length, GLchar* infoLog);

// use pglCreateProgram()
GLuint glCreateProgram();

void glLinkProgram(GLuint program);
void glShaderSource(GLuint shader, GLsizei count, const GLchar** string, const GLint* length);
void glGetShaderiv(GLuint shader, GLenum pname, GLint* params);
GLuint glCreateShader(GLenum shaderType);
void glDeleteShader(GLuint shader);
void glDetachShader(GLuint program, GLuint shader);

GLint glGetUniformLocation(GLuint program, const GLchar* name);
GLint glGetAttribLocation(GLuint program, const GLchar* name);

void* glMapBuffer(GLenum target, GLenum access);
void* glMapNamedBuffer(GLuint buffer, GLenum access);
GLboolean glUnmapBuffer(GLenum target);
GLboolean glUnmapNamedBuffer(GLuint buffer);

void glUniform1f(GLint location, GLfloat v0);
void glUniform2f(GLint location, GLfloat v0, GLfloat v1);
void glUniform3f(GLint location, GLfloat v0, GLfloat v1, GLfloat v2);
void glUniform4f(GLint location, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3);

void glUniform1i(GLint location, GLint v0);
void glUniform2i(GLint location, GLint v0, GLint v1);
void glUniform3i(GLint location, GLint v0, GLint v1, GLint v2);
void glUniform4i(GLint location, GLint v0, GLint v1, GLint v2, GLint v3);

void glUniform1ui(GLuint location, GLuint v0);
void glUniform2ui(GLuint location, GLuint v0, GLuint v1);
void glUniform3ui(GLuint location, GLuint v0, GLuint v1, GLuint v2);
void glUniform4ui(GLuint location, GLuint v0, GLuint v1, GLuint v2, GLuint v3);

void glUniform1fv(GLint location, GLsizei count, const GLfloat* value);
void glUniform2fv(GLint location, GLsizei count, const GLfloat* value);
void glUniform3fv(GLint location, GLsizei count, const GLfloat* value);
void glUniform4fv(GLint location, GLsizei count, const GLfloat* value);

void glUniform1iv(GLint location, GLsizei count, const GLint* value);
void glUniform2iv(GLint location, GLsizei count, const GLint* value);
void glUniform3iv(GLint location, GLsizei count, const GLint* value);
void glUniform4iv(GLint location, GLsizei count, const GLint* value);

void glUniform1uiv(GLint location, GLsizei count, const GLuint* value);
void glUniform2uiv(GLint location, GLsizei count, const GLuint* value);
void glUniform3uiv(GLint location, GLsizei count, const GLuint* value);
void glUniform4uiv(GLint location, GLsizei count, const GLuint* value);

void glUniformMatrix2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value);
void glUniformMatrix3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value);
void glUniformMatrix4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value);
void glUniformMatrix2x3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value);
void glUniformMatrix3x2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value);
void glUniformMatrix2x4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value);
void glUniformMatrix4x2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value);
void glUniformMatrix3x4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value);
void glUniformMatrix4x3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value);




void pglClearScreen();

//This isn't possible in regular OpenGL, changing the interpolation of vs output of
//an existing shader.  You'd have to switch between 2 almost identical shaders.
void pglSetInterp(GLsizei n, GLenum* interpolation);


//TODO
//pglDrawRect(x, y, w, h)
//pglDrawPoint(x, y)
void pglDrawFrame();

// TODO should these be called pglMapped* since that's what they do?  I don't think so, since it's too different from actual spec for mapped buffers
void pglBufferData(GLenum target, GLsizei size, const GLvoid* data, GLenum usage);
void pglTexImage1D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLint border, GLenum format, GLenum type, const GLvoid* data);

void pglTexImage2D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid* data);

void pglTexImage3D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, const GLvoid* data);

// I could make these return the data?
void pglGetBufferData(GLuint buffer, GLvoid** data);
void pglGetTextureData(GLuint texture, GLvoid** data);


void put_pixel(Color color, int x, int y);

//Should I have it take a glFramebuffer as paramater?
void put_line(Color the_color, float x1, float y1, float x2, float y2);

void put_triangle(Color c1, Color c2, Color c3, vec2 p1, vec2 p2, vec2 p3);


#ifdef __cplusplus
}
#endif

// end GL_H
#endif

#ifdef PORTABLEGL_IMPLEMENTATION



extern inline float rsw_rand_float(float min, float max);
extern inline vec2 make_vec2(float x, float y);
extern inline vec3 make_vec3(float x, float y, float z);
extern inline vec4 make_vec4(float x, float y, float z, float w);
extern inline ivec2 make_ivec2(int x, int y);
extern inline ivec3 make_ivec3(int x, int y, int z);
extern inline ivec4 make_ivec4(int x, int y, int z, int w);
extern inline vec2 negate_vec2(vec2 v);
extern inline vec3 negate_vec3(vec3 v);
extern inline vec4 negate_vec4(vec4 v);
extern inline void fprint_vec2(FILE* f, vec2 v, const char* append);
extern inline void fprint_vec3(FILE* f, vec3 v, const char* append);
extern inline void fprint_vec4(FILE* f, vec4 v, const char* append);
extern inline void print_vec2(vec2 v, const char* append);
extern inline void print_vec3(vec3 v, const char* append);
extern inline void print_vec4(vec4 v, const char* append);
extern inline int fread_vec2(FILE* f, vec2* v);
extern inline int fread_vec3(FILE* f, vec3* v);
extern inline int fread_vec4(FILE* f, vec4* v);

extern inline void fprint_dvec2(FILE* f, dvec2 v, const char* append);
extern inline void fprint_dvec3(FILE* f, dvec3 v, const char* append);
extern inline void fprint_dvec4(FILE* f, dvec4 v, const char* append);
extern inline int fread_dvec2(FILE* f, dvec2* v);
extern inline int fread_dvec3(FILE* f, dvec3* v);
extern inline int fread_dvec4(FILE* f, dvec4* v);

extern inline void fprint_ivec2(FILE* f, ivec2 v, const char* append);
extern inline void fprint_ivec3(FILE* f, ivec3 v, const char* append);
extern inline void fprint_ivec4(FILE* f, ivec4 v, const char* append);
extern inline int fread_ivec2(FILE* f, ivec2* v);
extern inline int fread_ivec3(FILE* f, ivec3* v);
extern inline int fread_ivec4(FILE* f, ivec4* v);

extern inline void fprint_uvec2(FILE* f, uvec2 v, const char* append);
extern inline void fprint_uvec3(FILE* f, uvec3 v, const char* append);
extern inline void fprint_uvec4(FILE* f, uvec4 v, const char* append);
extern inline int fread_uvec2(FILE* f, uvec2* v);
extern inline int fread_uvec3(FILE* f, uvec3* v);
extern inline int fread_uvec4(FILE* f, uvec4* v);

extern inline float length_vec2(vec2 a);
extern inline float length_vec3(vec3 a);
extern inline vec2 norm_vec2(vec2 a);
extern inline vec3 norm_vec3(vec3 a);
extern inline void normalize_vec2(vec2* a);
extern inline void normalize_vec3(vec3* a);
extern inline vec2 add_vec2s(vec2 a, vec2 b);
extern inline vec3 add_vec3s(vec3 a, vec3 b);
extern inline vec4 add_vec4s(vec4 a, vec4 b);
extern inline vec2 sub_vec2s(vec2 a, vec2 b);
extern inline vec3 sub_vec3s(vec3 a, vec3 b);
extern inline vec4 sub_vec4s(vec4 a, vec4 b);
extern inline vec2 mult_vec2s(vec2 a, vec2 b);
extern inline vec3 mult_vec3s(vec3 a, vec3 b);
extern inline vec4 mult_vec4s(vec4 a, vec4 b);
extern inline vec2 div_vec2s(vec2 a, vec2 b);
extern inline vec3 div_vec3s(vec3 a, vec3 b);
extern inline vec4 div_vec4s(vec4 a, vec4 b);
extern inline float dot_vec2s(vec2 a, vec2 b);
extern inline float dot_vec3s(vec3 a, vec3 b);
extern inline float dot_vec4s(vec4 a, vec4 b);
extern inline vec2 scale_vec2(vec2 a, float s);
extern inline vec3 scale_vec3(vec3 a, float s);
extern inline vec4 scale_vec4(vec4 a, float s);
extern inline int equal_vec2s(vec2 a, vec2 b);
extern inline int equal_vec3s(vec3 a, vec3 b);
extern inline int equal_vec4s(vec4 a, vec4 b);
extern inline int equal_epsilon_vec2s(vec2 a, vec2 b, float epsilon);
extern inline int equal_epsilon_vec3s(vec3 a, vec3 b, float epsilon);
extern inline int equal_epsilon_vec4s(vec4 a, vec4 b, float epsilon);
extern inline vec2 vec4_to_vec2(vec4 a);
extern inline vec3 vec4_to_vec3(vec4 a);
extern inline vec2 vec4_to_vec2h(vec4 a);
extern inline vec3 vec4_to_vec3h(vec4 a);
extern inline vec3 cross_product(const vec3 u, const vec3 v);
extern inline float angle_between_vec3(const vec3 u, const vec3 v);

extern inline vec2 x_mat2(mat2 m);
extern inline vec2 y_mat2(mat2 m);
extern inline vec2 c1_mat2(mat2 m);
extern inline vec2 c2_mat2(mat2 m);

extern inline void setc1_mat2(mat2 m, vec2 v);
extern inline void setc2_mat2(mat2 m, vec2 v);
extern inline void setx_mat2(mat2 m, vec2 v);
extern inline void sety_mat2(mat2 m, vec2 v);

extern inline vec3 x_mat3(mat3 m);
extern inline vec3 y_mat3(mat3 m);
extern inline vec3 z_mat3(mat3 m);
extern inline vec3 c1_mat3(mat3 m);
extern inline vec3 c2_mat3(mat3 m);
extern inline vec3 c3_mat3(mat3 m);

extern inline void setc1_mat3(mat3 m, vec3 v);
extern inline void setc2_mat3(mat3 m, vec3 v);
extern inline void setc3_mat3(mat3 m, vec3 v);

extern inline void setx_mat3(mat3 m, vec3 v);
extern inline void sety_mat3(mat3 m, vec3 v);
extern inline void setz_mat3(mat3 m, vec3 v);


extern inline vec4 c1_mat4(mat4 m);
extern inline vec4 c2_mat4(mat4 m);
extern inline vec4 c3_mat4(mat4 m);
extern inline vec4 c4_mat4(mat4 m);

extern inline vec4 x_mat4(mat4 m);
extern inline vec4 y_mat4(mat4 m);
extern inline vec4 z_mat4(mat4 m);
extern inline vec4 w_mat4(mat4 m);

extern inline void setc1_mat4v3(mat4 m, vec3 v);
extern inline void setc2_mat4v3(mat4 m, vec3 v);
extern inline void setc3_mat4v3(mat4 m, vec3 v);
extern inline void setc4_mat4v3(mat4 m, vec3 v);

extern inline void setc1_mat4v4(mat4 m, vec4 v);
extern inline void setc2_mat4v4(mat4 m, vec4 v);
extern inline void setc3_mat4v4(mat4 m, vec4 v);
extern inline void setc4_mat4v4(mat4 m, vec4 v);

extern inline void setx_mat4v3(mat4 m, vec3 v);
extern inline void sety_mat4v3(mat4 m, vec3 v);
extern inline void setz_mat4v3(mat4 m, vec3 v);
extern inline void setw_mat4v3(mat4 m, vec3 v);

extern inline void setx_mat4v4(mat4 m, vec4 v);
extern inline void sety_mat4v4(mat4 m, vec4 v);
extern inline void setz_mat4v4(mat4 m, vec4 v);
extern inline void setw_mat4v4(mat4 m, vec4 v);



extern inline void fprint_mat2(FILE* f, mat2 m, const char* append);
extern inline void fprint_mat3(FILE* f, mat3 m, const char* append);
extern inline void fprint_mat4(FILE* f, mat4 m, const char* append);
extern inline void print_mat2(mat2 m, const char* append);
extern inline void print_mat3(mat3 m, const char* append);
extern inline void print_mat4(mat4 m, const char* append);
extern inline vec2 mult_mat2_vec2(mat2 m, vec2 v);
extern inline vec3 mult_mat3_vec3(mat3 m, vec3 v);
extern inline vec4 mult_mat4_vec4(mat4 m, vec4 v);
extern inline void scale_mat3(mat3 m, float x, float y, float z);
extern inline void scale_mat4(mat4 m, float x, float y, float z);
extern inline void translation_mat4(mat4 m, float x, float y, float z);
extern inline void extract_rotation_mat4(mat3 dst, mat4 src, int normalize);

extern inline Color make_Color(u8 red, u8 green, u8 blue, u8 alpha);
extern inline Color vec4_to_Color(vec4 v);
extern inline void print_Color(Color c, const char* append);
extern inline vec4 Color_to_vec4(Color c);
extern inline Line make_Line(float x1, float y1, float x2, float y2);
extern inline float line_func(Line* line, float x, float y);
extern inline float line_findy(Line* line, float x);
extern inline float line_findx(Line* line, float y);




void load_rotation_mat3(mat3 mat, vec3 v, float angle)
{
	float s, c;
	float xx, yy, zz, xy, yz, zx, xs, ys, zs, one_c;

	s = sin(angle);
	c = cos(angle);

	// Rotation matrix is normalized
	normalize_vec3(&v);

	xx = v.x * v.x;
	yy = v.y * v.y;
	zz = v.z * v.z;
	xy = v.x * v.y;
	yz = v.y * v.z;
	zx = v.z * v.x;
	xs = v.x * s;
	ys = v.y * s;
	zs = v.z * s;
	one_c = 1.0f - c;

#ifndef ROW_MAJOR
	mat[0] = (one_c * xx) + c;
	mat[3] = (one_c * xy) - zs;
	mat[6] = (one_c * zx) + ys;

	mat[1] = (one_c * xy) + zs;
	mat[4] = (one_c * yy) + c;
	mat[7] = (one_c * yz) - xs;

	mat[2] = (one_c * zx) - ys;
	mat[5] = (one_c * yz) + xs;
	mat[8] = (one_c * zz) + c;
#else
	mat[0] = (one_c * xx) + c;
	mat[1] = (one_c * xy) - zs;
	mat[2] = (one_c * zx) + ys;

	mat[3] = (one_c * xy) + zs;
	mat[4] = (one_c * yy) + c;
	mat[5] = (one_c * yz) - xs;

	mat[6] = (one_c * zx) - ys;
	mat[7] = (one_c * yz) + xs;
	mat[8] = (one_c * zz) + c;
#endif
}



/*
 * mat4
 */

//TODO use restrict?
void mult_mat4_mat4(mat4 c, mat4 a, mat4 b)
{
#ifndef ROW_MAJOR
	c[ 0] = a[0]*b[ 0] + a[4]*b[ 1] + a[8]*b[ 2] + a[12]*b[ 3];
	c[ 4] = a[0]*b[ 4] + a[4]*b[ 5] + a[8]*b[ 6] + a[12]*b[ 7];
	c[ 8] = a[0]*b[ 8] + a[4]*b[ 9] + a[8]*b[10] + a[12]*b[11];
	c[12] = a[0]*b[12] + a[4]*b[13] + a[8]*b[14] + a[12]*b[15];

	c[ 1] = a[1]*b[ 0] + a[5]*b[ 1] + a[9]*b[ 2] + a[13]*b[ 3];
	c[ 5] = a[1]*b[ 4] + a[5]*b[ 5] + a[9]*b[ 6] + a[13]*b[ 7];
	c[ 9] = a[1]*b[ 8] + a[5]*b[ 9] + a[9]*b[10] + a[13]*b[11];
	c[13] = a[1]*b[12] + a[5]*b[13] + a[9]*b[14] + a[13]*b[15];

	c[ 2] = a[2]*b[ 0] + a[6]*b[ 1] + a[10]*b[ 2] + a[14]*b[ 3];
	c[ 6] = a[2]*b[ 4] + a[6]*b[ 5] + a[10]*b[ 6] + a[14]*b[ 7];
	c[10] = a[2]*b[ 8] + a[6]*b[ 9] + a[10]*b[10] + a[14]*b[11];
	c[14] = a[2]*b[12] + a[6]*b[13] + a[10]*b[14] + a[14]*b[15];

	c[ 3] = a[3]*b[ 0] + a[7]*b[ 1] + a[11]*b[ 2] + a[15]*b[ 3];
	c[ 7] = a[3]*b[ 4] + a[7]*b[ 5] + a[11]*b[ 6] + a[15]*b[ 7];
	c[11] = a[3]*b[ 8] + a[7]*b[ 9] + a[11]*b[10] + a[15]*b[11];
	c[15] = a[3]*b[12] + a[7]*b[13] + a[11]*b[14] + a[15]*b[15];

#else
	c[0] = a[0]*b[0] + a[1]*b[4] + a[2]*b[8] + a[3]*b[12];
	c[1] = a[0]*b[1] + a[1]*b[5] + a[2]*b[9] + a[3]*b[13];
	c[2] = a[0]*b[2] + a[1]*b[6] + a[2]*b[10] + a[3]*b[14];
	c[3] = a[0]*b[3] + a[1]*b[7] + a[2]*b[11] + a[3]*b[15];

	c[4] = a[4]*b[0] + a[5]*b[4] + a[6]*b[8] + a[7]*b[12];
	c[5] = a[4]*b[1] + a[5]*b[5] + a[6]*b[9] + a[7]*b[13];
	c[6] = a[4]*b[2] + a[5]*b[6] + a[6]*b[10] + a[7]*b[14];
	c[7] = a[4]*b[3] + a[5]*b[7] + a[6]*b[11] + a[7]*b[15];

	c[ 8] = a[8]*b[0] + a[9]*b[4] + a[10]*b[8] + a[11]*b[12];
	c[ 9] = a[8]*b[1] + a[9]*b[5] + a[10]*b[9] + a[11]*b[13];
	c[10] = a[8]*b[2] + a[9]*b[6] + a[10]*b[10] + a[11]*b[14];
	c[11] = a[8]*b[3] + a[9]*b[7] + a[10]*b[11] + a[11]*b[15];

	c[12] = a[12]*b[0] + a[13]*b[4] + a[14]*b[8] + a[15]*b[12];
	c[13] = a[12]*b[1] + a[13]*b[5] + a[14]*b[9] + a[15]*b[13];
	c[14] = a[12]*b[2] + a[13]*b[6] + a[14]*b[10] + a[15]*b[14];
	c[15] = a[12]*b[3] + a[13]*b[7] + a[14]*b[11] + a[15]*b[15];
#endif
}

void load_rotation_mat4(mat4 mat, vec3 v, float angle)
{
	float s, c;
	float xx, yy, zz, xy, yz, zx, xs, ys, zs, one_c;

	s = sin(angle);
	c = cos(angle);

	// Rotation matrix is normalized
	normalize_vec3(&v);

	xx = v.x * v.x;
	yy = v.y * v.y;
	zz = v.z * v.z;
	xy = v.x * v.y;
	yz = v.y * v.z;
	zx = v.z * v.x;
	xs = v.x * s;
	ys = v.y * s;
	zs = v.z * s;
	one_c = 1.0f - c;

#ifndef ROW_MAJOR
	mat[ 0] = (one_c * xx) + c;
	mat[ 4] = (one_c * xy) - zs;
	mat[ 8] = (one_c * zx) + ys;
	mat[12] = 0.0f;

	mat[ 1] = (one_c * xy) + zs;
	mat[ 5] = (one_c * yy) + c;
	mat[ 9] = (one_c * yz) - xs;
	mat[13] = 0.0f;

	mat[ 2] = (one_c * zx) - ys;
	mat[ 6] = (one_c * yz) + xs;
	mat[10] = (one_c * zz) + c;
	mat[14] = 0.0f;

	mat[ 3] = 0.0f;
	mat[ 7] = 0.0f;
	mat[11] = 0.0f;
	mat[15] = 1.0f;
#else
	mat[0] = (one_c * xx) + c;
	mat[1] = (one_c * xy) - zs;
	mat[2] = (one_c * zx) + ys;
	mat[3] = 0.0f;

	mat[4] = (one_c * xy) + zs;
	mat[5] = (one_c * yy) + c;
	mat[6] = (one_c * yz) - xs;
	mat[7] = 0.0f;

	mat[8] = (one_c * zx) - ys;
	mat[9] = (one_c * yz) + xs;
	mat[10] = (one_c * zz) + c;
	mat[11] = 0.0f;

	mat[12] = 0.0f;
	mat[13] = 0.0f;
	mat[14] = 0.0f;
	mat[15] = 1.0f;
#endif
}



/* TODO
static float det_ij(const mat4 m, const int i, const int j)
{
	float ret, mat[3][3];
	int x = 0, y = 0;

	for (int ii=0; ii<4; ++ii) {
		y = 0;
		if (ii == i) continue;
		for (int jj=0; jj<4; ++jj) {
			if (jj == j) continue;
			mat[x][y] = m[ii*4+jj];
			y++;
		}
		x++;
	}



	ret =  mat[0][0]*(mat[1][1]*mat[2][2]-mat[2][1]*mat[1][2]);
	ret -= mat[0][1]*(mat[1][0]*mat[2][2]-mat[2][0]*mat[1][2]);
	ret += mat[0][2]*(mat[1][0]*mat[2][1]-mat[2][0]*mat[1][1]);

	return ret;
}


void invert_mat4(mat4 mInverse, const mat4& m)
{
	int i, j;
	float det, detij;
	mat4 inverse_mat;

	// calculate 4x4 determinant
	det = 0.0f;
	for (i = 0; i < 4; i++) {
		det += (i & 0x1) ? (-m.matrix[i] * det_ij(m, 0, i)) : (m.matrix[i] * det_ij(m, 0, i));
	}
	det = 1.0f / det;

	// calculate inverse
	for (i = 0; i < 4; i++) {
		for (j = 0; j < 4; j++) {
			detij = det_ij(m, j, i);
			inverse_mat[(i*4)+j] = ((i+j) & 0x1) ? (-detij * det) : (detij *det);
		}
	}

}


*/




////////////////////////////////////////////////////////////////////////////////////////////

//assumes converting from canonical view volume [-1,1]^3
//works just like glViewport, x and y are lower left corner.  opengl should be 1.
void make_viewport_matrix(mat4 mat, int x, int y, unsigned int width, unsigned int height, int opengl)
{
	float w, h, l, t, b, r;

	if (opengl) {
		//See glspec page 104, integer grid is lower left pixel corners
		w = width, h = height;
		l = x, b = y;
		//range is [0, w) x [0 , h)
		//TODO pick best epsilon?
		r = l + w - 0.01; //epsilon larger than float precision
		t = b + h - 0.01;

#ifndef ROW_MAJOR
		mat[ 0] = (r - l) / 2;
		mat[ 4] = 0;
		mat[ 8] = 0;
		mat[12] = (l + r) / 2;

		mat[ 1] = 0;
		//see below
		mat[ 5] = (t - b) / 2;
		mat[ 9] = 0;
		mat[13] = (b + t) / 2;

		mat[ 2] = 0;
		mat[ 6] = 0;
		mat[10] = 1;
		mat[14] = 0;

		mat[ 3] = 0;
		mat[ 7] = 0;
		mat[11] = 0;
		mat[15] = 1;
#else
		mat[0] = (r - l) / 2;
		mat[1] = 0;
		mat[2] = 0;
		mat[3] = (l + r) / 2;

		mat[4] = 0;
		//this used to be negative to flip y till I changed glFramebuffer and draw_pixel to accomplish the same thing
		mat[5] = (t - b) / 2;
		mat[6] = 0;
		mat[7] = (b + t) / 2;

		mat[8] = 0;
		mat[9] = 0;
		mat[10] = 1;
		mat[11] = 0;

		mat[12] = 0;
		mat[13] = 0;
		mat[14] = 0;
		mat[15] = 1;
#endif

	} else {
		//old way with pixel centers at integer coordinates
		//see pages 133/4 and 144 of FoCG
		//necessary for fast integer only bresenham line drawing

		w = width, h = height;
		l = x - 0.5f;
		b = y - 0.5f;
		r = l + w;
		t = b + h;

#ifndef ROW_MAJOR
		mat[ 0] = (r - l) / 2;
		mat[ 4] = 0;
		mat[ 8] = 0;
		mat[12] = (l + r) / 2;

		mat[ 1] = 0;
		//see below
		mat[ 5] = (t - b) / 2;
		mat[ 9] = 0;
		mat[13] = (b + t) / 2;

		mat[ 2] = 0;
		mat[ 6] = 0;
		mat[10] = 1;
		mat[14] = 0;

		mat[ 3] = 0;
		mat[ 7] = 0;
		mat[11] = 0;
		mat[15] = 1;
#else
		mat[0] = (r - l) / 2;
		mat[1] = 0;
		mat[2] = 0;
		mat[3] = (l + r) / 2;

		mat[4] = 0;
		//make this negative to reflect y otherwise positive y maps to lower half of the screen
		//this is mapping the unit square [-1,1]^2 to the window size. x is fine because it increases left to right
		//but the screen coordinates (ie framebuffer memory) increase top to bottom opposite of the canonical square
		//negating this is the easiest way to fix it without any side effects.
		mat[5] = (t - b) / 2;
		mat[6] = 0;
		mat[7] = (b + t) / 2;

		mat[8] = 0;
		mat[9] = 0;
		mat[10] = 1;
		mat[11] = 0;

		mat[12] = 0;
		mat[13] = 0;
		mat[14] = 0;
		mat[15] = 1;
#endif
	}
}



//I can't really think of any reason to ever use this matrix alone.
//You'd always do ortho * pers and really if you're doing perspective projection
//just use make_perspective_matrix (or less likely make perspective_proj_matrix)
//
//This function is really just for completeness sake based off of FoCG 3rd edition pg 152
//changed slightly.  z_near and z_far are always positive and z_near < z_far
//
//Inconsistently, to generate an ortho matrix to multiply with that will get the equivalent
//of the other 2 functions you'd use -z_near and -z_far and near > far.
void make_pers_matrix(mat4 mat, float z_near, float z_far)
{
#ifndef ROW_MAJOR
	mat[ 0] = z_near;
	mat[ 4] = 0;
	mat[ 8] = 0;
	mat[12] = 0;

	mat[ 1] = 0;
	mat[ 5] = z_near;
	mat[ 9] = 0;
	mat[13] = 0;

	mat[ 2] = 0;
	mat[ 6] = 0;
	mat[10] = z_near + z_far;
	mat[14] = (z_far * z_near);

	mat[ 3] = 0;
	mat[ 7] = 0;
	mat[11] = -1;
	mat[15] = 0;
#else
	mat[0] = z_near;
	mat[1] = 0;
	mat[2] = 0;
	mat[3] = 0;

	mat[4] = 0;
	mat[5] = z_near;
	mat[6] = 0;
	mat[7] = 0;

	mat[ 8] = 0;
	mat[ 9] = 0;
	mat[10] = z_near + z_far;
	mat[11] = (z_far * z_near);

	mat[12] = 0;
	mat[13] = 0;
	mat[14] = -1;
	mat[15] = 0;
#endif
}



// Create a projection matrix
// Similiar to the old gluPerspective... fov is in radians btw...
void make_perspective_matrix(mat4 mat, float fov, float aspect, float n, float f)
{
	float t = n * tanf(fov * 0.5f);
	float b = -t;
	float l = b * aspect;
	float r = -l;

	make_perspective_proj_matrix(mat, l, r, b, t, n, f);

}

void make_perspective_proj_matrix(mat4 mat, float l, float r, float b, float t, float n, float f)
{
#ifndef ROW_MAJOR
	mat[ 0] = (2.0f * n) / (r - l);
	mat[ 4] = 0.0f;
	mat[ 8] = (r + l) / (r - l);
	mat[12] = 0.0f;

	mat[ 1] = 0.0f;
	mat[ 5] = (2.0f * n) / (t - b);
	mat[ 9] = (t + b) / (t - b);
	mat[13] = 0.0f;

	mat[ 2] = 0.0f;
	mat[ 6] = 0.0f;
	mat[10] = -((f + n) / (f - n));
	mat[14] = -((2.0f * (f*n))/(f - n));

	mat[ 3] = 0.0f;
	mat[ 7] = 0.0f;
	mat[11] = -1.0f;
	mat[15] = 0.0f;
#else
	mat[0] = (2.0f * n) / (r - l);
	mat[1] = 0.0f;
	mat[2] = (r + l) / (r - l);
	mat[3] = 0.0f;

	mat[4] = 0.0f;
	mat[5] = (2.0f * n) / (t - b);
	mat[6] = (t + b) / (t - b);
	mat[7] = 0.0f;

	mat[8] = 0.0f;
	mat[9] = 0.0f;
	mat[10] = -((f + n) / (f - n));
	mat[11] = -((2.0f * (f*n))/(f - n));

	mat[12] = 0.0f;
	mat[13] = 0.0f;
	mat[14] = -1.0f;
	mat[15] = 0.0f;
#endif
}




//n and f really are near and far not min and max so if you want the standard looking down the -z axis
// then n > f otherwise n < f
void make_orthographic_matrix(mat4 mat, float l, float r, float b, float t, float n, float f)
{
#ifndef ROW_MAJOR
	mat[ 0] = 2.0f / (r - l);
	mat[ 4] = 0;
	mat[ 8] = 0;
	mat[12] = -((r + l)/(r - l));

	mat[ 1] = 0;
	mat[ 5] = 2.0f / (t - b);
	mat[ 9] = 0;
	mat[13] = -((t + b)/(t - b));

	mat[ 2] = 0;
	mat[ 6] = 0;
	mat[10] = 2.0f / (f - n);  //removed - in front of 2 . . . book doesn't have it but superbible did
	mat[14] = -((n + f)/(f - n));

	mat[ 3] = 0;
	mat[ 7] = 0;
	mat[11] = 0;
	mat[15] = 1;
#else
	mat[0] = 2.0f / (r - l);
	mat[1] = 0;
	mat[2] = 0;
	mat[3] = -((r + l)/(r - l));
	mat[4] = 0;
	mat[5] = 2.0f / (t - b);
	mat[6] = 0;
	mat[7] = -((t + b)/(t - b));
	mat[8] = 0;
	mat[9] = 0;
	mat[10] = 2.0f / (f - n);  //removed - in front of 2 . . . book doesn't have it but superbible did
	mat[11] = -((n + f)/(f - n));
	mat[12] = 0;
	mat[13] = 0;
	mat[14] = 0;
	mat[15] = 1;
#endif


	//now I know why the superbible had the -
	//OpenGL uses a left handed canonical view volume [-1,1]^3 when passed the identity matrix
	//ie in Normalized Device Coordinates.  The math/matrix presented in Fundamentals of Computer
	//Graphics assumes a right handed version of the same volume.  The negative isn't necessary
	//if you set n and f correctly as near and far not low and high
}

//per https://www.opengl.org/sdk/docs/man2/xhtml/gluLookAt.xml
//and glm.g-truc.net (glm/gtc/matrix_transform.inl)
void lookAt(mat4 mat, vec3 eye, vec3 center, vec3 up)
{
	SET_IDENTITY_MAT4(mat);

	vec3 f = norm_vec3(sub_vec3s(center, eye));
	vec3 s = norm_vec3(cross_product(f, up));
	vec3 u = cross_product(s, f);

	setx_mat4v3(mat, s);
	sety_mat4v3(mat, u);
	setz_mat4v3(mat, negate_vec3(f));
	setc4_mat4v3(mat, make_vec3(-dot_vec3s(s, eye), -dot_vec3s(u, eye), dot_vec3s(f, eye)));
}


#define CVECTOR_glVertex_Array_IMPLEMENTATION
#ifndef CVECTOR_glVertex_Array_H
#define CVECTOR_glVertex_Array_H

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Data structure for glVertex_Array vector. */
typedef struct cvector_glVertex_Array
{
	glVertex_Array* a;           /**< Array. */
	size_t size;       /**< Current size (amount you use when manipulating array directly). */
	size_t capacity;   /**< Allocated size of array; always >= size. */
} cvector_glVertex_Array;



extern size_t CVEC_glVertex_Array_SZ;

int cvec_glVertex_Array(cvector_glVertex_Array* vec, size_t size, size_t capacity);
int cvec_init_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array* vals, size_t num);

cvector_glVertex_Array* cvec_glVertex_Array_heap(size_t size, size_t capacity);
cvector_glVertex_Array* cvec_init_glVertex_Array_heap(glVertex_Array* vals, size_t num);
int cvec_copyc_glVertex_Array(void* dest, void* src);
int cvec_copy_glVertex_Array(cvector_glVertex_Array* dest, cvector_glVertex_Array* src);

int cvec_push_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array a);
glVertex_Array cvec_pop_glVertex_Array(cvector_glVertex_Array* vec);

int cvec_extend_glVertex_Array(cvector_glVertex_Array* vec, size_t num);
int cvec_insert_glVertex_Array(cvector_glVertex_Array* vec, size_t i, glVertex_Array a);
int cvec_insert_array_glVertex_Array(cvector_glVertex_Array* vec, size_t i, glVertex_Array* a, size_t num);
glVertex_Array cvec_replace_glVertex_Array(cvector_glVertex_Array* vec, size_t i, glVertex_Array a);
void cvec_erase_glVertex_Array(cvector_glVertex_Array* vec, size_t start, size_t end);
int cvec_reserve_glVertex_Array(cvector_glVertex_Array* vec, size_t size);
int cvec_set_cap_glVertex_Array(cvector_glVertex_Array* vec, size_t size);
void cvec_set_val_sz_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array val);
void cvec_set_val_cap_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array val);

glVertex_Array* cvec_back_glVertex_Array(cvector_glVertex_Array* vec);

void cvec_clear_glVertex_Array(cvector_glVertex_Array* vec);
void cvec_free_glVertex_Array_heap(void* vec);
void cvec_free_glVertex_Array(void* vec);

#ifdef __cplusplus
}
#endif

/* CVECTOR_glVertex_Array_H */
#endif


#ifdef CVECTOR_glVertex_Array_IMPLEMENTATION

size_t CVEC_glVertex_Array_SZ = 50;

#define CVEC_glVertex_Array_ALLOCATOR(x) ((x+1) * 2)


#if defined(CVEC_MALLOC) && defined(CVEC_FREE) && defined(CVEC_REALLOC)
/* ok */
#elif !defined(CVEC_MALLOC) && !defined(CVEC_FREE) && !defined(CVEC_REALLOC)
/* ok */
#else
#error "Must define all or none of CVEC_MALLOC, CVEC_FREE, and CVEC_REALLOC."
#endif

#ifndef CVEC_MALLOC
#define CVEC_MALLOC(sz)      malloc(sz)
#define CVEC_REALLOC(p, sz)  realloc(p, sz)
#define CVEC_FREE(p)         free(p)
#endif

#ifndef CVEC_MEMMOVE
#include <string.h>
#define CVEC_MEMMOVE(dst, src, sz)  memmove(dst, src, sz)
#endif

#ifndef CVEC_ASSERT
#include <assert.h>
#define CVEC_ASSERT(x)       assert(x)
#endif

cvector_glVertex_Array* cvec_glVertex_Array_heap(size_t size, size_t capacity)
{
	cvector_glVertex_Array* vec;
	if (!(vec = (cvector_glVertex_Array*)CVEC_MALLOC(sizeof(cvector_glVertex_Array)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glVertex_Array_SZ;

	if (!(vec->a = (glVertex_Array*)CVEC_MALLOC(vec->capacity*sizeof(glVertex_Array)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	return vec;
}

cvector_glVertex_Array* cvec_init_glVertex_Array_heap(glVertex_Array* vals, size_t num)
{
	cvector_glVertex_Array* vec;
	
	if (!(vec = (cvector_glVertex_Array*)CVEC_MALLOC(sizeof(cvector_glVertex_Array)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->capacity = num + CVEC_glVertex_Array_SZ;
	vec->size = num;
	if (!(vec->a = (glVertex_Array*)CVEC_MALLOC(vec->capacity*sizeof(glVertex_Array)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glVertex_Array)*num);

	return vec;
}

int cvec_glVertex_Array(cvector_glVertex_Array* vec, size_t size, size_t capacity)
{
	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glVertex_Array_SZ;

	if (!(vec->a = (glVertex_Array*)CVEC_MALLOC(vec->capacity*sizeof(glVertex_Array)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	return 1;
}

int cvec_init_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array* vals, size_t num)
{
	vec->capacity = num + CVEC_glVertex_Array_SZ;
	vec->size = num;
	if (!(vec->a = (glVertex_Array*)CVEC_MALLOC(vec->capacity*sizeof(glVertex_Array)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glVertex_Array)*num);

	return 1;
}

int cvec_copyc_glVertex_Array(void* dest, void* src)
{
	cvector_glVertex_Array* vec1 = (cvector_glVertex_Array*)dest;
	cvector_glVertex_Array* vec2 = (cvector_glVertex_Array*)src;

	vec1->a = NULL;
	vec1->size = 0;
	vec1->capacity = 0;

	return cvec_copy_glVertex_Array(vec1, vec2);
}

int cvec_copy_glVertex_Array(cvector_glVertex_Array* dest, cvector_glVertex_Array* src)
{
	glVertex_Array* tmp = NULL;
	if (!(tmp = (glVertex_Array*)CVEC_REALLOC(dest->a, src->capacity*sizeof(glVertex_Array)))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	dest->a = tmp;

	CVEC_MEMMOVE(dest->a, src->a, src->size*sizeof(glVertex_Array));
	dest->size = src->size;
	dest->capacity = src->capacity;
	return 1;
}


int cvec_push_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array a)
{
	glVertex_Array* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		vec->a[vec->size++] = a;
	} else {
		tmp_sz = CVEC_glVertex_Array_ALLOCATOR(vec->capacity);
		if (!(tmp = (glVertex_Array*)CVEC_REALLOC(vec->a, sizeof(glVertex_Array)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->a[vec->size++] = a;
		vec->capacity = tmp_sz;
	}
	return 1;
}

glVertex_Array cvec_pop_glVertex_Array(cvector_glVertex_Array* vec)
{
	return vec->a[--vec->size];
}

glVertex_Array* cvec_back_glVertex_Array(cvector_glVertex_Array* vec)
{
	return &vec->a[vec->size-1];
}

int cvec_extend_glVertex_Array(cvector_glVertex_Array* vec, size_t num)
{
	glVertex_Array* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glVertex_Array_SZ;
		if (!(tmp = (glVertex_Array*)CVEC_REALLOC(vec->a, sizeof(glVertex_Array)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	vec->size += num;
	return 1;
}

int cvec_insert_glVertex_Array(cvector_glVertex_Array* vec, size_t i, glVertex_Array a)
{
	glVertex_Array* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glVertex_Array));
		vec->a[i] = a;
	} else {
		tmp_sz = CVEC_glVertex_Array_ALLOCATOR(vec->capacity);
		if (!(tmp = (glVertex_Array*)CVEC_REALLOC(vec->a, sizeof(glVertex_Array)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glVertex_Array));
		vec->a[i] = a;
		vec->capacity = tmp_sz;
	}

	vec->size++;
	return 1;
}

int cvec_insert_array_glVertex_Array(cvector_glVertex_Array* vec, size_t i, glVertex_Array* a, size_t num)
{
	glVertex_Array* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glVertex_Array_SZ;
		if (!(tmp = (glVertex_Array*)CVEC_REALLOC(vec->a, sizeof(glVertex_Array)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	CVEC_MEMMOVE(&vec->a[i+num], &vec->a[i], (vec->size-i)*sizeof(glVertex_Array));
	CVEC_MEMMOVE(&vec->a[i], a, num*sizeof(glVertex_Array));
	vec->size += num;
	return 1;
}

glVertex_Array cvec_replace_glVertex_Array(cvector_glVertex_Array* vec, size_t i, glVertex_Array a)
{
	glVertex_Array tmp = vec->a[i];
	vec->a[i] = a;
	return tmp;
}

void cvec_erase_glVertex_Array(cvector_glVertex_Array* vec, size_t start, size_t end)
{
	size_t d = end - start + 1;
	CVEC_MEMMOVE(&vec->a[start], &vec->a[end+1], (vec->size-1-end)*sizeof(glVertex_Array));
	vec->size -= d;
}


int cvec_reserve_glVertex_Array(cvector_glVertex_Array* vec, size_t size)
{
	glVertex_Array* tmp;
	if (vec->capacity < size) {
		if (!(tmp = (glVertex_Array*)CVEC_REALLOC(vec->a, sizeof(glVertex_Array)*(size+CVEC_glVertex_Array_SZ)))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = size + CVEC_glVertex_Array_SZ;
	}
	return 1;
}

int cvec_set_cap_glVertex_Array(cvector_glVertex_Array* vec, size_t size)
{
	glVertex_Array* tmp;
	if (size < vec->size) {
		vec->size = size;
	}

	if (!(tmp = (glVertex_Array*)CVEC_REALLOC(vec->a, sizeof(glVertex_Array)*size))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	vec->a = tmp;
	vec->capacity = size;
	return 1;
}

void cvec_set_val_sz_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array val)
{
	size_t i;
	for (i=0; i<vec->size; i++) {
		vec->a[i] = val;
	}
}

void cvec_set_val_cap_glVertex_Array(cvector_glVertex_Array* vec, glVertex_Array val)
{
	size_t i;
	for (i=0; i<vec->capacity; i++) {
		vec->a[i] = val;
	}
}

void cvec_clear_glVertex_Array(cvector_glVertex_Array* vec) { vec->size = 0; }

void cvec_free_glVertex_Array_heap(void* vec)
{
	cvector_glVertex_Array* tmp = (cvector_glVertex_Array*)vec;
	if (!tmp) return;
	CVEC_FREE(tmp->a);
	CVEC_FREE(tmp);
}

void cvec_free_glVertex_Array(void* vec)
{
	cvector_glVertex_Array* tmp = (cvector_glVertex_Array*)vec;
	CVEC_FREE(tmp->a);
	tmp->size = 0;
	tmp->capacity = 0;
}

#endif
#define CVECTOR_glBuffer_IMPLEMENTATION
#ifndef CVECTOR_glBuffer_H
#define CVECTOR_glBuffer_H

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Data structure for glBuffer vector. */
typedef struct cvector_glBuffer
{
	glBuffer* a;           /**< Array. */
	size_t size;       /**< Current size (amount you use when manipulating array directly). */
	size_t capacity;   /**< Allocated size of array; always >= size. */
} cvector_glBuffer;



extern size_t CVEC_glBuffer_SZ;

int cvec_glBuffer(cvector_glBuffer* vec, size_t size, size_t capacity);
int cvec_init_glBuffer(cvector_glBuffer* vec, glBuffer* vals, size_t num);

cvector_glBuffer* cvec_glBuffer_heap(size_t size, size_t capacity);
cvector_glBuffer* cvec_init_glBuffer_heap(glBuffer* vals, size_t num);
int cvec_copyc_glBuffer(void* dest, void* src);
int cvec_copy_glBuffer(cvector_glBuffer* dest, cvector_glBuffer* src);

int cvec_push_glBuffer(cvector_glBuffer* vec, glBuffer a);
glBuffer cvec_pop_glBuffer(cvector_glBuffer* vec);

int cvec_extend_glBuffer(cvector_glBuffer* vec, size_t num);
int cvec_insert_glBuffer(cvector_glBuffer* vec, size_t i, glBuffer a);
int cvec_insert_array_glBuffer(cvector_glBuffer* vec, size_t i, glBuffer* a, size_t num);
glBuffer cvec_replace_glBuffer(cvector_glBuffer* vec, size_t i, glBuffer a);
void cvec_erase_glBuffer(cvector_glBuffer* vec, size_t start, size_t end);
int cvec_reserve_glBuffer(cvector_glBuffer* vec, size_t size);
int cvec_set_cap_glBuffer(cvector_glBuffer* vec, size_t size);
void cvec_set_val_sz_glBuffer(cvector_glBuffer* vec, glBuffer val);
void cvec_set_val_cap_glBuffer(cvector_glBuffer* vec, glBuffer val);

glBuffer* cvec_back_glBuffer(cvector_glBuffer* vec);

void cvec_clear_glBuffer(cvector_glBuffer* vec);
void cvec_free_glBuffer_heap(void* vec);
void cvec_free_glBuffer(void* vec);

#ifdef __cplusplus
}
#endif

/* CVECTOR_glBuffer_H */
#endif


#ifdef CVECTOR_glBuffer_IMPLEMENTATION

size_t CVEC_glBuffer_SZ = 50;

#define CVEC_glBuffer_ALLOCATOR(x) ((x+1) * 2)


#if defined(CVEC_MALLOC) && defined(CVEC_FREE) && defined(CVEC_REALLOC)
/* ok */
#elif !defined(CVEC_MALLOC) && !defined(CVEC_FREE) && !defined(CVEC_REALLOC)
/* ok */
#else
#error "Must define all or none of CVEC_MALLOC, CVEC_FREE, and CVEC_REALLOC."
#endif

#ifndef CVEC_MALLOC
#define CVEC_MALLOC(sz)      malloc(sz)
#define CVEC_REALLOC(p, sz)  realloc(p, sz)
#define CVEC_FREE(p)         free(p)
#endif

#ifndef CVEC_MEMMOVE
#include <string.h>
#define CVEC_MEMMOVE(dst, src, sz)  memmove(dst, src, sz)
#endif

#ifndef CVEC_ASSERT
#include <assert.h>
#define CVEC_ASSERT(x)       assert(x)
#endif

cvector_glBuffer* cvec_glBuffer_heap(size_t size, size_t capacity)
{
	cvector_glBuffer* vec;
	if (!(vec = (cvector_glBuffer*)CVEC_MALLOC(sizeof(cvector_glBuffer)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glBuffer_SZ;

	if (!(vec->a = (glBuffer*)CVEC_MALLOC(vec->capacity*sizeof(glBuffer)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	return vec;
}

cvector_glBuffer* cvec_init_glBuffer_heap(glBuffer* vals, size_t num)
{
	cvector_glBuffer* vec;
	
	if (!(vec = (cvector_glBuffer*)CVEC_MALLOC(sizeof(cvector_glBuffer)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->capacity = num + CVEC_glBuffer_SZ;
	vec->size = num;
	if (!(vec->a = (glBuffer*)CVEC_MALLOC(vec->capacity*sizeof(glBuffer)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glBuffer)*num);

	return vec;
}

int cvec_glBuffer(cvector_glBuffer* vec, size_t size, size_t capacity)
{
	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glBuffer_SZ;

	if (!(vec->a = (glBuffer*)CVEC_MALLOC(vec->capacity*sizeof(glBuffer)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	return 1;
}

int cvec_init_glBuffer(cvector_glBuffer* vec, glBuffer* vals, size_t num)
{
	vec->capacity = num + CVEC_glBuffer_SZ;
	vec->size = num;
	if (!(vec->a = (glBuffer*)CVEC_MALLOC(vec->capacity*sizeof(glBuffer)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glBuffer)*num);

	return 1;
}

int cvec_copyc_glBuffer(void* dest, void* src)
{
	cvector_glBuffer* vec1 = (cvector_glBuffer*)dest;
	cvector_glBuffer* vec2 = (cvector_glBuffer*)src;

	vec1->a = NULL;
	vec1->size = 0;
	vec1->capacity = 0;

	return cvec_copy_glBuffer(vec1, vec2);
}

int cvec_copy_glBuffer(cvector_glBuffer* dest, cvector_glBuffer* src)
{
	glBuffer* tmp = NULL;
	if (!(tmp = (glBuffer*)CVEC_REALLOC(dest->a, src->capacity*sizeof(glBuffer)))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	dest->a = tmp;

	CVEC_MEMMOVE(dest->a, src->a, src->size*sizeof(glBuffer));
	dest->size = src->size;
	dest->capacity = src->capacity;
	return 1;
}


int cvec_push_glBuffer(cvector_glBuffer* vec, glBuffer a)
{
	glBuffer* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		vec->a[vec->size++] = a;
	} else {
		tmp_sz = CVEC_glBuffer_ALLOCATOR(vec->capacity);
		if (!(tmp = (glBuffer*)CVEC_REALLOC(vec->a, sizeof(glBuffer)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->a[vec->size++] = a;
		vec->capacity = tmp_sz;
	}
	return 1;
}

glBuffer cvec_pop_glBuffer(cvector_glBuffer* vec)
{
	return vec->a[--vec->size];
}

glBuffer* cvec_back_glBuffer(cvector_glBuffer* vec)
{
	return &vec->a[vec->size-1];
}

int cvec_extend_glBuffer(cvector_glBuffer* vec, size_t num)
{
	glBuffer* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glBuffer_SZ;
		if (!(tmp = (glBuffer*)CVEC_REALLOC(vec->a, sizeof(glBuffer)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	vec->size += num;
	return 1;
}

int cvec_insert_glBuffer(cvector_glBuffer* vec, size_t i, glBuffer a)
{
	glBuffer* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glBuffer));
		vec->a[i] = a;
	} else {
		tmp_sz = CVEC_glBuffer_ALLOCATOR(vec->capacity);
		if (!(tmp = (glBuffer*)CVEC_REALLOC(vec->a, sizeof(glBuffer)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glBuffer));
		vec->a[i] = a;
		vec->capacity = tmp_sz;
	}

	vec->size++;
	return 1;
}

int cvec_insert_array_glBuffer(cvector_glBuffer* vec, size_t i, glBuffer* a, size_t num)
{
	glBuffer* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glBuffer_SZ;
		if (!(tmp = (glBuffer*)CVEC_REALLOC(vec->a, sizeof(glBuffer)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	CVEC_MEMMOVE(&vec->a[i+num], &vec->a[i], (vec->size-i)*sizeof(glBuffer));
	CVEC_MEMMOVE(&vec->a[i], a, num*sizeof(glBuffer));
	vec->size += num;
	return 1;
}

glBuffer cvec_replace_glBuffer(cvector_glBuffer* vec, size_t i, glBuffer a)
{
	glBuffer tmp = vec->a[i];
	vec->a[i] = a;
	return tmp;
}

void cvec_erase_glBuffer(cvector_glBuffer* vec, size_t start, size_t end)
{
	size_t d = end - start + 1;
	CVEC_MEMMOVE(&vec->a[start], &vec->a[end+1], (vec->size-1-end)*sizeof(glBuffer));
	vec->size -= d;
}


int cvec_reserve_glBuffer(cvector_glBuffer* vec, size_t size)
{
	glBuffer* tmp;
	if (vec->capacity < size) {
		if (!(tmp = (glBuffer*)CVEC_REALLOC(vec->a, sizeof(glBuffer)*(size+CVEC_glBuffer_SZ)))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = size + CVEC_glBuffer_SZ;
	}
	return 1;
}

int cvec_set_cap_glBuffer(cvector_glBuffer* vec, size_t size)
{
	glBuffer* tmp;
	if (size < vec->size) {
		vec->size = size;
	}

	if (!(tmp = (glBuffer*)CVEC_REALLOC(vec->a, sizeof(glBuffer)*size))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	vec->a = tmp;
	vec->capacity = size;
	return 1;
}

void cvec_set_val_sz_glBuffer(cvector_glBuffer* vec, glBuffer val)
{
	size_t i;
	for (i=0; i<vec->size; i++) {
		vec->a[i] = val;
	}
}

void cvec_set_val_cap_glBuffer(cvector_glBuffer* vec, glBuffer val)
{
	size_t i;
	for (i=0; i<vec->capacity; i++) {
		vec->a[i] = val;
	}
}

void cvec_clear_glBuffer(cvector_glBuffer* vec) { vec->size = 0; }

void cvec_free_glBuffer_heap(void* vec)
{
	cvector_glBuffer* tmp = (cvector_glBuffer*)vec;
	if (!tmp) return;
	CVEC_FREE(tmp->a);
	CVEC_FREE(tmp);
}

void cvec_free_glBuffer(void* vec)
{
	cvector_glBuffer* tmp = (cvector_glBuffer*)vec;
	CVEC_FREE(tmp->a);
	tmp->size = 0;
	tmp->capacity = 0;
}

#endif
#define CVECTOR_glTexture_IMPLEMENTATION
#ifndef CVECTOR_glTexture_H
#define CVECTOR_glTexture_H

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Data structure for glTexture vector. */
typedef struct cvector_glTexture
{
	glTexture* a;           /**< Array. */
	size_t size;       /**< Current size (amount you use when manipulating array directly). */
	size_t capacity;   /**< Allocated size of array; always >= size. */
} cvector_glTexture;



extern size_t CVEC_glTexture_SZ;

int cvec_glTexture(cvector_glTexture* vec, size_t size, size_t capacity);
int cvec_init_glTexture(cvector_glTexture* vec, glTexture* vals, size_t num);

cvector_glTexture* cvec_glTexture_heap(size_t size, size_t capacity);
cvector_glTexture* cvec_init_glTexture_heap(glTexture* vals, size_t num);
int cvec_copyc_glTexture(void* dest, void* src);
int cvec_copy_glTexture(cvector_glTexture* dest, cvector_glTexture* src);

int cvec_push_glTexture(cvector_glTexture* vec, glTexture a);
glTexture cvec_pop_glTexture(cvector_glTexture* vec);

int cvec_extend_glTexture(cvector_glTexture* vec, size_t num);
int cvec_insert_glTexture(cvector_glTexture* vec, size_t i, glTexture a);
int cvec_insert_array_glTexture(cvector_glTexture* vec, size_t i, glTexture* a, size_t num);
glTexture cvec_replace_glTexture(cvector_glTexture* vec, size_t i, glTexture a);
void cvec_erase_glTexture(cvector_glTexture* vec, size_t start, size_t end);
int cvec_reserve_glTexture(cvector_glTexture* vec, size_t size);
int cvec_set_cap_glTexture(cvector_glTexture* vec, size_t size);
void cvec_set_val_sz_glTexture(cvector_glTexture* vec, glTexture val);
void cvec_set_val_cap_glTexture(cvector_glTexture* vec, glTexture val);

glTexture* cvec_back_glTexture(cvector_glTexture* vec);

void cvec_clear_glTexture(cvector_glTexture* vec);
void cvec_free_glTexture_heap(void* vec);
void cvec_free_glTexture(void* vec);

#ifdef __cplusplus
}
#endif

/* CVECTOR_glTexture_H */
#endif


#ifdef CVECTOR_glTexture_IMPLEMENTATION

size_t CVEC_glTexture_SZ = 50;

#define CVEC_glTexture_ALLOCATOR(x) ((x+1) * 2)


#if defined(CVEC_MALLOC) && defined(CVEC_FREE) && defined(CVEC_REALLOC)
/* ok */
#elif !defined(CVEC_MALLOC) && !defined(CVEC_FREE) && !defined(CVEC_REALLOC)
/* ok */
#else
#error "Must define all or none of CVEC_MALLOC, CVEC_FREE, and CVEC_REALLOC."
#endif

#ifndef CVEC_MALLOC
#define CVEC_MALLOC(sz)      malloc(sz)
#define CVEC_REALLOC(p, sz)  realloc(p, sz)
#define CVEC_FREE(p)         free(p)
#endif

#ifndef CVEC_MEMMOVE
#include <string.h>
#define CVEC_MEMMOVE(dst, src, sz)  memmove(dst, src, sz)
#endif

#ifndef CVEC_ASSERT
#include <assert.h>
#define CVEC_ASSERT(x)       assert(x)
#endif

cvector_glTexture* cvec_glTexture_heap(size_t size, size_t capacity)
{
	cvector_glTexture* vec;
	if (!(vec = (cvector_glTexture*)CVEC_MALLOC(sizeof(cvector_glTexture)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glTexture_SZ;

	if (!(vec->a = (glTexture*)CVEC_MALLOC(vec->capacity*sizeof(glTexture)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	return vec;
}

cvector_glTexture* cvec_init_glTexture_heap(glTexture* vals, size_t num)
{
	cvector_glTexture* vec;
	
	if (!(vec = (cvector_glTexture*)CVEC_MALLOC(sizeof(cvector_glTexture)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->capacity = num + CVEC_glTexture_SZ;
	vec->size = num;
	if (!(vec->a = (glTexture*)CVEC_MALLOC(vec->capacity*sizeof(glTexture)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glTexture)*num);

	return vec;
}

int cvec_glTexture(cvector_glTexture* vec, size_t size, size_t capacity)
{
	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glTexture_SZ;

	if (!(vec->a = (glTexture*)CVEC_MALLOC(vec->capacity*sizeof(glTexture)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	return 1;
}

int cvec_init_glTexture(cvector_glTexture* vec, glTexture* vals, size_t num)
{
	vec->capacity = num + CVEC_glTexture_SZ;
	vec->size = num;
	if (!(vec->a = (glTexture*)CVEC_MALLOC(vec->capacity*sizeof(glTexture)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glTexture)*num);

	return 1;
}

int cvec_copyc_glTexture(void* dest, void* src)
{
	cvector_glTexture* vec1 = (cvector_glTexture*)dest;
	cvector_glTexture* vec2 = (cvector_glTexture*)src;

	vec1->a = NULL;
	vec1->size = 0;
	vec1->capacity = 0;

	return cvec_copy_glTexture(vec1, vec2);
}

int cvec_copy_glTexture(cvector_glTexture* dest, cvector_glTexture* src)
{
	glTexture* tmp = NULL;
	if (!(tmp = (glTexture*)CVEC_REALLOC(dest->a, src->capacity*sizeof(glTexture)))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	dest->a = tmp;

	CVEC_MEMMOVE(dest->a, src->a, src->size*sizeof(glTexture));
	dest->size = src->size;
	dest->capacity = src->capacity;
	return 1;
}


int cvec_push_glTexture(cvector_glTexture* vec, glTexture a)
{
	glTexture* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		vec->a[vec->size++] = a;
	} else {
		tmp_sz = CVEC_glTexture_ALLOCATOR(vec->capacity);
		if (!(tmp = (glTexture*)CVEC_REALLOC(vec->a, sizeof(glTexture)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->a[vec->size++] = a;
		vec->capacity = tmp_sz;
	}
	return 1;
}

glTexture cvec_pop_glTexture(cvector_glTexture* vec)
{
	return vec->a[--vec->size];
}

glTexture* cvec_back_glTexture(cvector_glTexture* vec)
{
	return &vec->a[vec->size-1];
}

int cvec_extend_glTexture(cvector_glTexture* vec, size_t num)
{
	glTexture* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glTexture_SZ;
		if (!(tmp = (glTexture*)CVEC_REALLOC(vec->a, sizeof(glTexture)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	vec->size += num;
	return 1;
}

int cvec_insert_glTexture(cvector_glTexture* vec, size_t i, glTexture a)
{
	glTexture* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glTexture));
		vec->a[i] = a;
	} else {
		tmp_sz = CVEC_glTexture_ALLOCATOR(vec->capacity);
		if (!(tmp = (glTexture*)CVEC_REALLOC(vec->a, sizeof(glTexture)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glTexture));
		vec->a[i] = a;
		vec->capacity = tmp_sz;
	}

	vec->size++;
	return 1;
}

int cvec_insert_array_glTexture(cvector_glTexture* vec, size_t i, glTexture* a, size_t num)
{
	glTexture* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glTexture_SZ;
		if (!(tmp = (glTexture*)CVEC_REALLOC(vec->a, sizeof(glTexture)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	CVEC_MEMMOVE(&vec->a[i+num], &vec->a[i], (vec->size-i)*sizeof(glTexture));
	CVEC_MEMMOVE(&vec->a[i], a, num*sizeof(glTexture));
	vec->size += num;
	return 1;
}

glTexture cvec_replace_glTexture(cvector_glTexture* vec, size_t i, glTexture a)
{
	glTexture tmp = vec->a[i];
	vec->a[i] = a;
	return tmp;
}

void cvec_erase_glTexture(cvector_glTexture* vec, size_t start, size_t end)
{
	size_t d = end - start + 1;
	CVEC_MEMMOVE(&vec->a[start], &vec->a[end+1], (vec->size-1-end)*sizeof(glTexture));
	vec->size -= d;
}


int cvec_reserve_glTexture(cvector_glTexture* vec, size_t size)
{
	glTexture* tmp;
	if (vec->capacity < size) {
		if (!(tmp = (glTexture*)CVEC_REALLOC(vec->a, sizeof(glTexture)*(size+CVEC_glTexture_SZ)))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = size + CVEC_glTexture_SZ;
	}
	return 1;
}

int cvec_set_cap_glTexture(cvector_glTexture* vec, size_t size)
{
	glTexture* tmp;
	if (size < vec->size) {
		vec->size = size;
	}

	if (!(tmp = (glTexture*)CVEC_REALLOC(vec->a, sizeof(glTexture)*size))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	vec->a = tmp;
	vec->capacity = size;
	return 1;
}

void cvec_set_val_sz_glTexture(cvector_glTexture* vec, glTexture val)
{
	size_t i;
	for (i=0; i<vec->size; i++) {
		vec->a[i] = val;
	}
}

void cvec_set_val_cap_glTexture(cvector_glTexture* vec, glTexture val)
{
	size_t i;
	for (i=0; i<vec->capacity; i++) {
		vec->a[i] = val;
	}
}

void cvec_clear_glTexture(cvector_glTexture* vec) { vec->size = 0; }

void cvec_free_glTexture_heap(void* vec)
{
	cvector_glTexture* tmp = (cvector_glTexture*)vec;
	if (!tmp) return;
	CVEC_FREE(tmp->a);
	CVEC_FREE(tmp);
}

void cvec_free_glTexture(void* vec)
{
	cvector_glTexture* tmp = (cvector_glTexture*)vec;
	CVEC_FREE(tmp->a);
	tmp->size = 0;
	tmp->capacity = 0;
}

#endif
#define CVECTOR_glProgram_IMPLEMENTATION
#ifndef CVECTOR_glProgram_H
#define CVECTOR_glProgram_H

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Data structure for glProgram vector. */
typedef struct cvector_glProgram
{
	glProgram* a;           /**< Array. */
	size_t size;       /**< Current size (amount you use when manipulating array directly). */
	size_t capacity;   /**< Allocated size of array; always >= size. */
} cvector_glProgram;



extern size_t CVEC_glProgram_SZ;

int cvec_glProgram(cvector_glProgram* vec, size_t size, size_t capacity);
int cvec_init_glProgram(cvector_glProgram* vec, glProgram* vals, size_t num);

cvector_glProgram* cvec_glProgram_heap(size_t size, size_t capacity);
cvector_glProgram* cvec_init_glProgram_heap(glProgram* vals, size_t num);
int cvec_copyc_glProgram(void* dest, void* src);
int cvec_copy_glProgram(cvector_glProgram* dest, cvector_glProgram* src);

int cvec_push_glProgram(cvector_glProgram* vec, glProgram a);
glProgram cvec_pop_glProgram(cvector_glProgram* vec);

int cvec_extend_glProgram(cvector_glProgram* vec, size_t num);
int cvec_insert_glProgram(cvector_glProgram* vec, size_t i, glProgram a);
int cvec_insert_array_glProgram(cvector_glProgram* vec, size_t i, glProgram* a, size_t num);
glProgram cvec_replace_glProgram(cvector_glProgram* vec, size_t i, glProgram a);
void cvec_erase_glProgram(cvector_glProgram* vec, size_t start, size_t end);
int cvec_reserve_glProgram(cvector_glProgram* vec, size_t size);
int cvec_set_cap_glProgram(cvector_glProgram* vec, size_t size);
void cvec_set_val_sz_glProgram(cvector_glProgram* vec, glProgram val);
void cvec_set_val_cap_glProgram(cvector_glProgram* vec, glProgram val);

glProgram* cvec_back_glProgram(cvector_glProgram* vec);

void cvec_clear_glProgram(cvector_glProgram* vec);
void cvec_free_glProgram_heap(void* vec);
void cvec_free_glProgram(void* vec);

#ifdef __cplusplus
}
#endif

/* CVECTOR_glProgram_H */
#endif


#ifdef CVECTOR_glProgram_IMPLEMENTATION

size_t CVEC_glProgram_SZ = 50;

#define CVEC_glProgram_ALLOCATOR(x) ((x+1) * 2)


#if defined(CVEC_MALLOC) && defined(CVEC_FREE) && defined(CVEC_REALLOC)
/* ok */
#elif !defined(CVEC_MALLOC) && !defined(CVEC_FREE) && !defined(CVEC_REALLOC)
/* ok */
#else
#error "Must define all or none of CVEC_MALLOC, CVEC_FREE, and CVEC_REALLOC."
#endif

#ifndef CVEC_MALLOC
#define CVEC_MALLOC(sz)      malloc(sz)
#define CVEC_REALLOC(p, sz)  realloc(p, sz)
#define CVEC_FREE(p)         free(p)
#endif

#ifndef CVEC_MEMMOVE
#include <string.h>
#define CVEC_MEMMOVE(dst, src, sz)  memmove(dst, src, sz)
#endif

#ifndef CVEC_ASSERT
#include <assert.h>
#define CVEC_ASSERT(x)       assert(x)
#endif

cvector_glProgram* cvec_glProgram_heap(size_t size, size_t capacity)
{
	cvector_glProgram* vec;
	if (!(vec = (cvector_glProgram*)CVEC_MALLOC(sizeof(cvector_glProgram)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glProgram_SZ;

	if (!(vec->a = (glProgram*)CVEC_MALLOC(vec->capacity*sizeof(glProgram)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	return vec;
}

cvector_glProgram* cvec_init_glProgram_heap(glProgram* vals, size_t num)
{
	cvector_glProgram* vec;
	
	if (!(vec = (cvector_glProgram*)CVEC_MALLOC(sizeof(cvector_glProgram)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->capacity = num + CVEC_glProgram_SZ;
	vec->size = num;
	if (!(vec->a = (glProgram*)CVEC_MALLOC(vec->capacity*sizeof(glProgram)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glProgram)*num);

	return vec;
}

int cvec_glProgram(cvector_glProgram* vec, size_t size, size_t capacity)
{
	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glProgram_SZ;

	if (!(vec->a = (glProgram*)CVEC_MALLOC(vec->capacity*sizeof(glProgram)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	return 1;
}

int cvec_init_glProgram(cvector_glProgram* vec, glProgram* vals, size_t num)
{
	vec->capacity = num + CVEC_glProgram_SZ;
	vec->size = num;
	if (!(vec->a = (glProgram*)CVEC_MALLOC(vec->capacity*sizeof(glProgram)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glProgram)*num);

	return 1;
}

int cvec_copyc_glProgram(void* dest, void* src)
{
	cvector_glProgram* vec1 = (cvector_glProgram*)dest;
	cvector_glProgram* vec2 = (cvector_glProgram*)src;

	vec1->a = NULL;
	vec1->size = 0;
	vec1->capacity = 0;

	return cvec_copy_glProgram(vec1, vec2);
}

int cvec_copy_glProgram(cvector_glProgram* dest, cvector_glProgram* src)
{
	glProgram* tmp = NULL;
	if (!(tmp = (glProgram*)CVEC_REALLOC(dest->a, src->capacity*sizeof(glProgram)))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	dest->a = tmp;

	CVEC_MEMMOVE(dest->a, src->a, src->size*sizeof(glProgram));
	dest->size = src->size;
	dest->capacity = src->capacity;
	return 1;
}


int cvec_push_glProgram(cvector_glProgram* vec, glProgram a)
{
	glProgram* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		vec->a[vec->size++] = a;
	} else {
		tmp_sz = CVEC_glProgram_ALLOCATOR(vec->capacity);
		if (!(tmp = (glProgram*)CVEC_REALLOC(vec->a, sizeof(glProgram)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->a[vec->size++] = a;
		vec->capacity = tmp_sz;
	}
	return 1;
}

glProgram cvec_pop_glProgram(cvector_glProgram* vec)
{
	return vec->a[--vec->size];
}

glProgram* cvec_back_glProgram(cvector_glProgram* vec)
{
	return &vec->a[vec->size-1];
}

int cvec_extend_glProgram(cvector_glProgram* vec, size_t num)
{
	glProgram* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glProgram_SZ;
		if (!(tmp = (glProgram*)CVEC_REALLOC(vec->a, sizeof(glProgram)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	vec->size += num;
	return 1;
}

int cvec_insert_glProgram(cvector_glProgram* vec, size_t i, glProgram a)
{
	glProgram* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glProgram));
		vec->a[i] = a;
	} else {
		tmp_sz = CVEC_glProgram_ALLOCATOR(vec->capacity);
		if (!(tmp = (glProgram*)CVEC_REALLOC(vec->a, sizeof(glProgram)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glProgram));
		vec->a[i] = a;
		vec->capacity = tmp_sz;
	}

	vec->size++;
	return 1;
}

int cvec_insert_array_glProgram(cvector_glProgram* vec, size_t i, glProgram* a, size_t num)
{
	glProgram* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glProgram_SZ;
		if (!(tmp = (glProgram*)CVEC_REALLOC(vec->a, sizeof(glProgram)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	CVEC_MEMMOVE(&vec->a[i+num], &vec->a[i], (vec->size-i)*sizeof(glProgram));
	CVEC_MEMMOVE(&vec->a[i], a, num*sizeof(glProgram));
	vec->size += num;
	return 1;
}

glProgram cvec_replace_glProgram(cvector_glProgram* vec, size_t i, glProgram a)
{
	glProgram tmp = vec->a[i];
	vec->a[i] = a;
	return tmp;
}

void cvec_erase_glProgram(cvector_glProgram* vec, size_t start, size_t end)
{
	size_t d = end - start + 1;
	CVEC_MEMMOVE(&vec->a[start], &vec->a[end+1], (vec->size-1-end)*sizeof(glProgram));
	vec->size -= d;
}


int cvec_reserve_glProgram(cvector_glProgram* vec, size_t size)
{
	glProgram* tmp;
	if (vec->capacity < size) {
		if (!(tmp = (glProgram*)CVEC_REALLOC(vec->a, sizeof(glProgram)*(size+CVEC_glProgram_SZ)))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = size + CVEC_glProgram_SZ;
	}
	return 1;
}

int cvec_set_cap_glProgram(cvector_glProgram* vec, size_t size)
{
	glProgram* tmp;
	if (size < vec->size) {
		vec->size = size;
	}

	if (!(tmp = (glProgram*)CVEC_REALLOC(vec->a, sizeof(glProgram)*size))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	vec->a = tmp;
	vec->capacity = size;
	return 1;
}

void cvec_set_val_sz_glProgram(cvector_glProgram* vec, glProgram val)
{
	size_t i;
	for (i=0; i<vec->size; i++) {
		vec->a[i] = val;
	}
}

void cvec_set_val_cap_glProgram(cvector_glProgram* vec, glProgram val)
{
	size_t i;
	for (i=0; i<vec->capacity; i++) {
		vec->a[i] = val;
	}
}

void cvec_clear_glProgram(cvector_glProgram* vec) { vec->size = 0; }

void cvec_free_glProgram_heap(void* vec)
{
	cvector_glProgram* tmp = (cvector_glProgram*)vec;
	if (!tmp) return;
	CVEC_FREE(tmp->a);
	CVEC_FREE(tmp);
}

void cvec_free_glProgram(void* vec)
{
	cvector_glProgram* tmp = (cvector_glProgram*)vec;
	CVEC_FREE(tmp->a);
	tmp->size = 0;
	tmp->capacity = 0;
}

#endif
#define CVECTOR_glVertex_IMPLEMENTATION
#ifndef CVECTOR_glVertex_H
#define CVECTOR_glVertex_H

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Data structure for glVertex vector. */
typedef struct cvector_glVertex
{
	glVertex* a;           /**< Array. */
	size_t size;       /**< Current size (amount you use when manipulating array directly). */
	size_t capacity;   /**< Allocated size of array; always >= size. */
} cvector_glVertex;



extern size_t CVEC_glVertex_SZ;

int cvec_glVertex(cvector_glVertex* vec, size_t size, size_t capacity);
int cvec_init_glVertex(cvector_glVertex* vec, glVertex* vals, size_t num);

cvector_glVertex* cvec_glVertex_heap(size_t size, size_t capacity);
cvector_glVertex* cvec_init_glVertex_heap(glVertex* vals, size_t num);
int cvec_copyc_glVertex(void* dest, void* src);
int cvec_copy_glVertex(cvector_glVertex* dest, cvector_glVertex* src);

int cvec_push_glVertex(cvector_glVertex* vec, glVertex a);
glVertex cvec_pop_glVertex(cvector_glVertex* vec);

int cvec_extend_glVertex(cvector_glVertex* vec, size_t num);
int cvec_insert_glVertex(cvector_glVertex* vec, size_t i, glVertex a);
int cvec_insert_array_glVertex(cvector_glVertex* vec, size_t i, glVertex* a, size_t num);
glVertex cvec_replace_glVertex(cvector_glVertex* vec, size_t i, glVertex a);
void cvec_erase_glVertex(cvector_glVertex* vec, size_t start, size_t end);
int cvec_reserve_glVertex(cvector_glVertex* vec, size_t size);
int cvec_set_cap_glVertex(cvector_glVertex* vec, size_t size);
void cvec_set_val_sz_glVertex(cvector_glVertex* vec, glVertex val);
void cvec_set_val_cap_glVertex(cvector_glVertex* vec, glVertex val);

glVertex* cvec_back_glVertex(cvector_glVertex* vec);

void cvec_clear_glVertex(cvector_glVertex* vec);
void cvec_free_glVertex_heap(void* vec);
void cvec_free_glVertex(void* vec);

#ifdef __cplusplus
}
#endif

/* CVECTOR_glVertex_H */
#endif


#ifdef CVECTOR_glVertex_IMPLEMENTATION

size_t CVEC_glVertex_SZ = 50;

#define CVEC_glVertex_ALLOCATOR(x) ((x+1) * 2)


#if defined(CVEC_MALLOC) && defined(CVEC_FREE) && defined(CVEC_REALLOC)
/* ok */
#elif !defined(CVEC_MALLOC) && !defined(CVEC_FREE) && !defined(CVEC_REALLOC)
/* ok */
#else
#error "Must define all or none of CVEC_MALLOC, CVEC_FREE, and CVEC_REALLOC."
#endif

#ifndef CVEC_MALLOC
#define CVEC_MALLOC(sz)      malloc(sz)
#define CVEC_REALLOC(p, sz)  realloc(p, sz)
#define CVEC_FREE(p)         free(p)
#endif

#ifndef CVEC_MEMMOVE
#include <string.h>
#define CVEC_MEMMOVE(dst, src, sz)  memmove(dst, src, sz)
#endif

#ifndef CVEC_ASSERT
#include <assert.h>
#define CVEC_ASSERT(x)       assert(x)
#endif

cvector_glVertex* cvec_glVertex_heap(size_t size, size_t capacity)
{
	cvector_glVertex* vec;
	if (!(vec = (cvector_glVertex*)CVEC_MALLOC(sizeof(cvector_glVertex)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glVertex_SZ;

	if (!(vec->a = (glVertex*)CVEC_MALLOC(vec->capacity*sizeof(glVertex)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	return vec;
}

cvector_glVertex* cvec_init_glVertex_heap(glVertex* vals, size_t num)
{
	cvector_glVertex* vec;
	
	if (!(vec = (cvector_glVertex*)CVEC_MALLOC(sizeof(cvector_glVertex)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->capacity = num + CVEC_glVertex_SZ;
	vec->size = num;
	if (!(vec->a = (glVertex*)CVEC_MALLOC(vec->capacity*sizeof(glVertex)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glVertex)*num);

	return vec;
}

int cvec_glVertex(cvector_glVertex* vec, size_t size, size_t capacity)
{
	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_glVertex_SZ;

	if (!(vec->a = (glVertex*)CVEC_MALLOC(vec->capacity*sizeof(glVertex)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	return 1;
}

int cvec_init_glVertex(cvector_glVertex* vec, glVertex* vals, size_t num)
{
	vec->capacity = num + CVEC_glVertex_SZ;
	vec->size = num;
	if (!(vec->a = (glVertex*)CVEC_MALLOC(vec->capacity*sizeof(glVertex)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(glVertex)*num);

	return 1;
}

int cvec_copyc_glVertex(void* dest, void* src)
{
	cvector_glVertex* vec1 = (cvector_glVertex*)dest;
	cvector_glVertex* vec2 = (cvector_glVertex*)src;

	vec1->a = NULL;
	vec1->size = 0;
	vec1->capacity = 0;

	return cvec_copy_glVertex(vec1, vec2);
}

int cvec_copy_glVertex(cvector_glVertex* dest, cvector_glVertex* src)
{
	glVertex* tmp = NULL;
	if (!(tmp = (glVertex*)CVEC_REALLOC(dest->a, src->capacity*sizeof(glVertex)))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	dest->a = tmp;

	CVEC_MEMMOVE(dest->a, src->a, src->size*sizeof(glVertex));
	dest->size = src->size;
	dest->capacity = src->capacity;
	return 1;
}


int cvec_push_glVertex(cvector_glVertex* vec, glVertex a)
{
	glVertex* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		vec->a[vec->size++] = a;
	} else {
		tmp_sz = CVEC_glVertex_ALLOCATOR(vec->capacity);
		if (!(tmp = (glVertex*)CVEC_REALLOC(vec->a, sizeof(glVertex)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->a[vec->size++] = a;
		vec->capacity = tmp_sz;
	}
	return 1;
}

glVertex cvec_pop_glVertex(cvector_glVertex* vec)
{
	return vec->a[--vec->size];
}

glVertex* cvec_back_glVertex(cvector_glVertex* vec)
{
	return &vec->a[vec->size-1];
}

int cvec_extend_glVertex(cvector_glVertex* vec, size_t num)
{
	glVertex* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glVertex_SZ;
		if (!(tmp = (glVertex*)CVEC_REALLOC(vec->a, sizeof(glVertex)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	vec->size += num;
	return 1;
}

int cvec_insert_glVertex(cvector_glVertex* vec, size_t i, glVertex a)
{
	glVertex* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glVertex));
		vec->a[i] = a;
	} else {
		tmp_sz = CVEC_glVertex_ALLOCATOR(vec->capacity);
		if (!(tmp = (glVertex*)CVEC_REALLOC(vec->a, sizeof(glVertex)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(glVertex));
		vec->a[i] = a;
		vec->capacity = tmp_sz;
	}

	vec->size++;
	return 1;
}

int cvec_insert_array_glVertex(cvector_glVertex* vec, size_t i, glVertex* a, size_t num)
{
	glVertex* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_glVertex_SZ;
		if (!(tmp = (glVertex*)CVEC_REALLOC(vec->a, sizeof(glVertex)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	CVEC_MEMMOVE(&vec->a[i+num], &vec->a[i], (vec->size-i)*sizeof(glVertex));
	CVEC_MEMMOVE(&vec->a[i], a, num*sizeof(glVertex));
	vec->size += num;
	return 1;
}

glVertex cvec_replace_glVertex(cvector_glVertex* vec, size_t i, glVertex a)
{
	glVertex tmp = vec->a[i];
	vec->a[i] = a;
	return tmp;
}

void cvec_erase_glVertex(cvector_glVertex* vec, size_t start, size_t end)
{
	size_t d = end - start + 1;
	CVEC_MEMMOVE(&vec->a[start], &vec->a[end+1], (vec->size-1-end)*sizeof(glVertex));
	vec->size -= d;
}


int cvec_reserve_glVertex(cvector_glVertex* vec, size_t size)
{
	glVertex* tmp;
	if (vec->capacity < size) {
		if (!(tmp = (glVertex*)CVEC_REALLOC(vec->a, sizeof(glVertex)*(size+CVEC_glVertex_SZ)))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = size + CVEC_glVertex_SZ;
	}
	return 1;
}

int cvec_set_cap_glVertex(cvector_glVertex* vec, size_t size)
{
	glVertex* tmp;
	if (size < vec->size) {
		vec->size = size;
	}

	if (!(tmp = (glVertex*)CVEC_REALLOC(vec->a, sizeof(glVertex)*size))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	vec->a = tmp;
	vec->capacity = size;
	return 1;
}

void cvec_set_val_sz_glVertex(cvector_glVertex* vec, glVertex val)
{
	size_t i;
	for (i=0; i<vec->size; i++) {
		vec->a[i] = val;
	}
}

void cvec_set_val_cap_glVertex(cvector_glVertex* vec, glVertex val)
{
	size_t i;
	for (i=0; i<vec->capacity; i++) {
		vec->a[i] = val;
	}
}

void cvec_clear_glVertex(cvector_glVertex* vec) { vec->size = 0; }

void cvec_free_glVertex_heap(void* vec)
{
	cvector_glVertex* tmp = (cvector_glVertex*)vec;
	if (!tmp) return;
	CVEC_FREE(tmp->a);
	CVEC_FREE(tmp);
}

void cvec_free_glVertex(void* vec)
{
	cvector_glVertex* tmp = (cvector_glVertex*)vec;
	CVEC_FREE(tmp->a);
	tmp->size = 0;
	tmp->capacity = 0;
}

#endif
#define CVECTOR_float_IMPLEMENTATION
#ifndef CVECTOR_float_H
#define CVECTOR_float_H

#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Data structure for float vector. */
typedef struct cvector_float
{
	float* a;           /**< Array. */
	size_t size;       /**< Current size (amount you use when manipulating array directly). */
	size_t capacity;   /**< Allocated size of array; always >= size. */
} cvector_float;



extern size_t CVEC_float_SZ;

int cvec_float(cvector_float* vec, size_t size, size_t capacity);
int cvec_init_float(cvector_float* vec, float* vals, size_t num);

cvector_float* cvec_float_heap(size_t size, size_t capacity);
cvector_float* cvec_init_float_heap(float* vals, size_t num);
int cvec_copyc_float(void* dest, void* src);
int cvec_copy_float(cvector_float* dest, cvector_float* src);

int cvec_push_float(cvector_float* vec, float a);
float cvec_pop_float(cvector_float* vec);

int cvec_extend_float(cvector_float* vec, size_t num);
int cvec_insert_float(cvector_float* vec, size_t i, float a);
int cvec_insert_array_float(cvector_float* vec, size_t i, float* a, size_t num);
float cvec_replace_float(cvector_float* vec, size_t i, float a);
void cvec_erase_float(cvector_float* vec, size_t start, size_t end);
int cvec_reserve_float(cvector_float* vec, size_t size);
int cvec_set_cap_float(cvector_float* vec, size_t size);
void cvec_set_val_sz_float(cvector_float* vec, float val);
void cvec_set_val_cap_float(cvector_float* vec, float val);

float* cvec_back_float(cvector_float* vec);

void cvec_clear_float(cvector_float* vec);
void cvec_free_float_heap(void* vec);
void cvec_free_float(void* vec);

#ifdef __cplusplus
}
#endif

/* CVECTOR_float_H */
#endif


#ifdef CVECTOR_float_IMPLEMENTATION

size_t CVEC_float_SZ = 50;

#define CVEC_float_ALLOCATOR(x) ((x+1) * 2)


#if defined(CVEC_MALLOC) && defined(CVEC_FREE) && defined(CVEC_REALLOC)
/* ok */
#elif !defined(CVEC_MALLOC) && !defined(CVEC_FREE) && !defined(CVEC_REALLOC)
/* ok */
#else
#error "Must define all or none of CVEC_MALLOC, CVEC_FREE, and CVEC_REALLOC."
#endif

#ifndef CVEC_MALLOC
#define CVEC_MALLOC(sz)      malloc(sz)
#define CVEC_REALLOC(p, sz)  realloc(p, sz)
#define CVEC_FREE(p)         free(p)
#endif

#ifndef CVEC_MEMMOVE
#include <string.h>
#define CVEC_MEMMOVE(dst, src, sz)  memmove(dst, src, sz)
#endif

#ifndef CVEC_ASSERT
#include <assert.h>
#define CVEC_ASSERT(x)       assert(x)
#endif

cvector_float* cvec_float_heap(size_t size, size_t capacity)
{
	cvector_float* vec;
	if (!(vec = (cvector_float*)CVEC_MALLOC(sizeof(cvector_float)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_float_SZ;

	if (!(vec->a = (float*)CVEC_MALLOC(vec->capacity*sizeof(float)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	return vec;
}

cvector_float* cvec_init_float_heap(float* vals, size_t num)
{
	cvector_float* vec;
	
	if (!(vec = (cvector_float*)CVEC_MALLOC(sizeof(cvector_float)))) {
		CVEC_ASSERT(vec != NULL);
		return NULL;
	}

	vec->capacity = num + CVEC_float_SZ;
	vec->size = num;
	if (!(vec->a = (float*)CVEC_MALLOC(vec->capacity*sizeof(float)))) {
		CVEC_ASSERT(vec->a != NULL);
		CVEC_FREE(vec);
		return NULL;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(float)*num);

	return vec;
}

int cvec_float(cvector_float* vec, size_t size, size_t capacity)
{
	vec->size = size;
	vec->capacity = (capacity > vec->size || (vec->size && capacity == vec->size)) ? capacity : vec->size + CVEC_float_SZ;

	if (!(vec->a = (float*)CVEC_MALLOC(vec->capacity*sizeof(float)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	return 1;
}

int cvec_init_float(cvector_float* vec, float* vals, size_t num)
{
	vec->capacity = num + CVEC_float_SZ;
	vec->size = num;
	if (!(vec->a = (float*)CVEC_MALLOC(vec->capacity*sizeof(float)))) {
		CVEC_ASSERT(vec->a != NULL);
		vec->size = vec->capacity = 0;
		return 0;
	}

	CVEC_MEMMOVE(vec->a, vals, sizeof(float)*num);

	return 1;
}

int cvec_copyc_float(void* dest, void* src)
{
	cvector_float* vec1 = (cvector_float*)dest;
	cvector_float* vec2 = (cvector_float*)src;

	vec1->a = NULL;
	vec1->size = 0;
	vec1->capacity = 0;

	return cvec_copy_float(vec1, vec2);
}

int cvec_copy_float(cvector_float* dest, cvector_float* src)
{
	float* tmp = NULL;
	if (!(tmp = (float*)CVEC_REALLOC(dest->a, src->capacity*sizeof(float)))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	dest->a = tmp;

	CVEC_MEMMOVE(dest->a, src->a, src->size*sizeof(float));
	dest->size = src->size;
	dest->capacity = src->capacity;
	return 1;
}


int cvec_push_float(cvector_float* vec, float a)
{
	float* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		vec->a[vec->size++] = a;
	} else {
		tmp_sz = CVEC_float_ALLOCATOR(vec->capacity);
		if (!(tmp = (float*)CVEC_REALLOC(vec->a, sizeof(float)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->a[vec->size++] = a;
		vec->capacity = tmp_sz;
	}
	return 1;
}

float cvec_pop_float(cvector_float* vec)
{
	return vec->a[--vec->size];
}

float* cvec_back_float(cvector_float* vec)
{
	return &vec->a[vec->size-1];
}

int cvec_extend_float(cvector_float* vec, size_t num)
{
	float* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_float_SZ;
		if (!(tmp = (float*)CVEC_REALLOC(vec->a, sizeof(float)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	vec->size += num;
	return 1;
}

int cvec_insert_float(cvector_float* vec, size_t i, float a)
{
	float* tmp;
	size_t tmp_sz;
	if (vec->capacity > vec->size) {
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(float));
		vec->a[i] = a;
	} else {
		tmp_sz = CVEC_float_ALLOCATOR(vec->capacity);
		if (!(tmp = (float*)CVEC_REALLOC(vec->a, sizeof(float)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		CVEC_MEMMOVE(&vec->a[i+1], &vec->a[i], (vec->size-i)*sizeof(float));
		vec->a[i] = a;
		vec->capacity = tmp_sz;
	}

	vec->size++;
	return 1;
}

int cvec_insert_array_float(cvector_float* vec, size_t i, float* a, size_t num)
{
	float* tmp;
	size_t tmp_sz;
	if (vec->capacity < vec->size + num) {
		tmp_sz = vec->capacity + num + CVEC_float_SZ;
		if (!(tmp = (float*)CVEC_REALLOC(vec->a, sizeof(float)*tmp_sz))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = tmp_sz;
	}

	CVEC_MEMMOVE(&vec->a[i+num], &vec->a[i], (vec->size-i)*sizeof(float));
	CVEC_MEMMOVE(&vec->a[i], a, num*sizeof(float));
	vec->size += num;
	return 1;
}

float cvec_replace_float(cvector_float* vec, size_t i, float a)
{
	float tmp = vec->a[i];
	vec->a[i] = a;
	return tmp;
}

void cvec_erase_float(cvector_float* vec, size_t start, size_t end)
{
	size_t d = end - start + 1;
	CVEC_MEMMOVE(&vec->a[start], &vec->a[end+1], (vec->size-1-end)*sizeof(float));
	vec->size -= d;
}


int cvec_reserve_float(cvector_float* vec, size_t size)
{
	float* tmp;
	if (vec->capacity < size) {
		if (!(tmp = (float*)CVEC_REALLOC(vec->a, sizeof(float)*(size+CVEC_float_SZ)))) {
			CVEC_ASSERT(tmp != NULL);
			return 0;
		}
		vec->a = tmp;
		vec->capacity = size + CVEC_float_SZ;
	}
	return 1;
}

int cvec_set_cap_float(cvector_float* vec, size_t size)
{
	float* tmp;
	if (size < vec->size) {
		vec->size = size;
	}

	if (!(tmp = (float*)CVEC_REALLOC(vec->a, sizeof(float)*size))) {
		CVEC_ASSERT(tmp != NULL);
		return 0;
	}
	vec->a = tmp;
	vec->capacity = size;
	return 1;
}

void cvec_set_val_sz_float(cvector_float* vec, float val)
{
	size_t i;
	for (i=0; i<vec->size; i++) {
		vec->a[i] = val;
	}
}

void cvec_set_val_cap_float(cvector_float* vec, float val)
{
	size_t i;
	for (i=0; i<vec->capacity; i++) {
		vec->a[i] = val;
	}
}

void cvec_clear_float(cvector_float* vec) { vec->size = 0; }

void cvec_free_float_heap(void* vec)
{
	cvector_float* tmp = (cvector_float*)vec;
	if (!tmp) return;
	CVEC_FREE(tmp->a);
	CVEC_FREE(tmp);
}

void cvec_free_float(void* vec)
{
	cvector_float* tmp = (cvector_float*)vec;
	CVEC_FREE(tmp->a);
	tmp->size = 0;
	tmp->capacity = 0;
}

#endif

static glContext* c;

static Color blend_pixel(vec4 src, vec4 dst);
static void draw_pixel_vec2(vec4 cf, vec2 pos);
static void draw_pixel(vec4 cf, int x, int y);
static void run_pipeline(GLenum mode, GLint first, GLsizei count, GLsizei instance, GLuint base_instance, GLboolean use_elements);

static void draw_triangle_clip(glVertex* v0, glVertex* v1, glVertex* v2, unsigned int provoke, int clip_bit);
static void draw_triangle_point(glVertex* v0, glVertex* v1,  glVertex* v2, unsigned int provoke);
static void draw_triangle_line(glVertex* v0, glVertex* v1,  glVertex* v2, unsigned int provoke);
static void draw_triangle_fill(glVertex* v0, glVertex* v1,  glVertex* v2, unsigned int provoke);
static void draw_triangle_final(glVertex* v0, glVertex* v1, glVertex* v2, unsigned int provoke);
static void draw_triangle(glVertex* v0, glVertex* v1, glVertex* v2, unsigned int provoke);

static void draw_line_clip(glVertex* v1, glVertex* v2);
static void draw_line_shader(vec4 v1, vec4 v2, float* v1_out, float* v2_out, unsigned int provoke);
static void draw_line_smooth_shader(vec4 v1, vec4 v2, float* v1_out, float* v2_out, unsigned int provoke);

/* this clip epsilon is needed to avoid some rounding errors after
   several clipping stages */

#define CLIP_EPSILON (1E-5)

static inline int gl_clipcode(vec4 pt)
{
	float w;

	w = pt.w * (1.0 + CLIP_EPSILON);
	return
		(((pt.z < -w) |
		 ((pt.z >  w) << 1)) &
		 (!c->depth_clamp |
		  !c->depth_clamp << 1)) |

		((pt.x < -w) << 2) |
		((pt.x >  w) << 3) |
		((pt.y < -w) << 4) |
		((pt.y >  w) << 5);

}




static int is_front_facing(glVertex* v0, glVertex* v1, glVertex* v2)
{
	//according to docs culling is done based on window coordinates
	//See page 3.6.1 page 116 of glspec33.core for more on rasterization, culling etc.
	//
	//TODO bug where it doesn't correctly cull if part of the triangle goes behind eye
	vec3 normal, tmpvec3 = { 0, 0, 1 };

	vec3 p0 = vec4_to_vec3h(v0->screen_space);
	vec3 p1 = vec4_to_vec3h(v1->screen_space);
	vec3 p2 = vec4_to_vec3h(v2->screen_space);

	//float a;

	//method from spec
	//a = p0.x*p1.y - p1.x*p0.y + p1.x*p2.y - p2.x*p1.y + p2.x*p0.y - p0.x*p2.y;
	//a /= 2;

	normal = cross_product(sub_vec3s(p1, p0), sub_vec3s(p2, p0));

	if (c->front_face == GL_CW) {
		//a = -a;
		normal = negate_vec3(normal);
	}

	//if (a <= 0) {
	if (dot_vec3s(normal, tmpvec3) <= 0) {
		return 0;
	}

	return 1;
}


static void do_vertex(glVertex_Attrib* v, int* enabled, unsigned int num_enabled, unsigned int i, unsigned int vert)
{
	GLuint buf;
	u8* buf_pos;
	vec4 tmpvec4;

	// copy/prep vertex attributes from buffers into appropriate positions for vertex shader to access
	for (int j=0; j<num_enabled; ++j) {
		buf = v[enabled[j]].buf;

		buf_pos = (u8*)c->buffers.a[buf].data + v[enabled[j]].offset + v[enabled[j]].stride*i;

		SET_VEC4(tmpvec4, 0.0f, 0.0f, 0.0f, 1.0f);
		memcpy(&tmpvec4, buf_pos, sizeof(float)*v[enabled[j]].size);

		c->vertex_attribs_vs[enabled[j]] = tmpvec4;
	}

	float* vs_out = &c->vs_output.output_buf.a[vert*c->vs_output.size];
	c->programs.a[c->cur_program].vertex_shader(vs_out, c->vertex_attribs_vs, &c->builtins, c->programs.a[c->cur_program].uniform);

	c->glverts.a[vert].vs_out = vs_out;
	c->glverts.a[vert].clip_space = c->builtins.gl_Position;
	c->glverts.a[vert].edge_flag = 1;

	c->glverts.a[vert].clip_code = gl_clipcode(c->builtins.gl_Position);
}


static void vertex_stage(GLint first, GLsizei count, GLsizei instance_id, GLuint base_instance, GLboolean use_elements)
{
	unsigned int i, j, vert, num_enabled;
	vec4 tmpvec4;
	u8* buf_pos;

	//save checking if enabled on every loop if we build this first
	//also initialize the vertex_attrib space
	float vec4_init[] = { 0.0f, 0.0f, 0.0f, 1.0f };
	int enabled[GL_MAX_VERTEX_ATTRIBS];
	memset(enabled, 0, sizeof(int)*GL_MAX_VERTEX_ATTRIBS);
	glVertex_Attrib* v = c->vertex_arrays.a[c->cur_vertex_array].vertex_attribs;
	GLuint elem_buffer = c->vertex_arrays.a[c->cur_vertex_array].element_buffer;

	for (i=0, j=0; i<GL_MAX_VERTEX_ATTRIBS; ++i) {
		memcpy(&c->vertex_attribs_vs[i], vec4_init, sizeof(vec4));

		if (v[i].enabled) {
			if (v[i].divisor == 0) {
				enabled[j++] = i;
				//printf("%d is enabled\n", i);
			} else if (!(instance_id % v[i].divisor)) {   //set instanced attributes if necessary
				int n = instance_id/v[i].divisor + base_instance;
				buf_pos = (u8*)c->buffers.a[v[i].buf].data + v[i].offset + v[i].stride*n;

				SET_VEC4(tmpvec4, 0.0f, 0.0f, 0.0f, 1.0f);

				memcpy(&tmpvec4, buf_pos, sizeof(float)*v[enabled[j]].size); //TODO why do I have v[enabled[j]].size and not just v[i].size?

				//c->cur_vertex_array->vertex_attribs[enabled[j]].buf->data;

				c->vertex_attribs_vs[i] = tmpvec4;
			}
		}
	}
	num_enabled = j;

	cvec_reserve_glVertex(&c->glverts, count);
	c->builtins.gl_InstanceID = instance_id;

	if (!use_elements) {
		for (vert=0, i=first; i<first+count; ++i, ++vert) {
			do_vertex(v, enabled, num_enabled, i, vert);
		}
	} else {
		GLuint* uint_array = (GLuint*) c->buffers.a[elem_buffer].data;
		GLushort* ushort_array = (GLushort*) c->buffers.a[elem_buffer].data;
		GLubyte* ubyte_array = (GLubyte*) c->buffers.a[elem_buffer].data;
		if (c->buffers.a[elem_buffer].type == GL_UNSIGNED_BYTE) {
			for (vert=0, i=first; i<first+count; ++i, ++vert) {
				do_vertex(v, enabled, num_enabled, ubyte_array[i], vert);
			}
		} else if (c->buffers.a[elem_buffer].type == GL_UNSIGNED_SHORT) {
			for (vert=0, i=first; i<first+count; ++i, ++vert) {
				do_vertex(v, enabled, num_enabled, ushort_array[i], vert);
			}
		} else {
			for (vert=0, i=first; i<first+count; ++i, ++vert) {
				do_vertex(v, enabled, num_enabled, uint_array[i], vert);
			}
		}
	}
}


//TODO make fs_input static?  or a member of glContext?
static void draw_point(glVertex* vert)
{
	float fs_input[GL_MAX_VERTEX_OUTPUT_COMPONENTS];

	vec3 point = vec4_to_vec3h(vert->screen_space);
	point.z = MAP(point.z, -1.0f, 1.0f, c->depth_range_near, c->depth_range_far);

	//TODO not sure if I'm supposed to do this ... doesn't say to in spec but it is called depth clamping
	//but I don't do it for lines or triangles (at least in fill or line mode)
	if (c->depth_clamp)
		point.z = clampf_01(point.z);

	//TODO why not just pass vs_output directly?  hmmm...
	memcpy(fs_input, vert->vs_out, c->vs_output.size*sizeof(float));

	//accounting for pixel centers at 0.5, using truncation
	float x = point.x + 0.5f;
	float y = point.y + 0.5f;
	float p_size = c->point_size;
	float origin = (c->point_spr_origin == GL_UPPER_LEFT) ? -1.0f : 1.0f;

	// Can easily clip whole point when point size <= 1 ...
	if (p_size <= 1) {
		if (x < 0 || y < 0 || x >= c->back_buffer.w || y >= c->back_buffer.h)
			return;
	}

	for (float i = y-p_size/2; i<y+p_size/2; ++i) {
		if (i < 0 || i >= c->back_buffer.h)
			continue;

		for (float j = x-p_size/2; j<x+p_size/2; ++j) {

			if (j < 0 || j >= c->back_buffer.w)
				continue;
			
			// per page 110 of 3.3 spec
			c->builtins.gl_PointCoord.x = 0.5f + ((int)j + 0.5f - point.x)/p_size;
			c->builtins.gl_PointCoord.y = 0.5f + origin * ((int)i + 0.5f - point.y)/p_size;

			SET_VEC4(c->builtins.gl_FragCoord, j, i, point.z, 1/vert->screen_space.w);
			c->builtins.discard = GL_FALSE;
			c->builtins.gl_FragDepth = point.z;
			c->programs.a[c->cur_program].fragment_shader(fs_input, &c->builtins, c->programs.a[c->cur_program].uniform);
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, j, i);
		}
	}
}

static void run_pipeline(GLenum mode, GLint first, GLsizei count, GLsizei instance, GLuint base_instance, GLboolean use_elements)
{
	unsigned int i, vert;
	int provoke;

	assert(count <= MAX_VERTICES);

	vertex_stage(first, count, instance, base_instance, use_elements);

	//fragment portion
	if (mode == GL_POINTS) {
		for (vert=0, i=first; i<first+count; ++i, ++vert) {
			if (c->glverts.a[vert].clip_code)
				continue;

			c->glverts.a[vert].screen_space = mult_mat4_vec4(c->vp_mat, c->glverts.a[vert].clip_space);

			draw_point(&c->glverts.a[vert]);
		}
	} else if (mode == GL_LINES) {
		for (vert=0, i=first; i<first+count-1; i+=2, vert+=2) {
			draw_line_clip(&c->glverts.a[vert], &c->glverts.a[vert+1]);
		}
	} else if (mode == GL_LINE_STRIP) {
		for (vert=0, i=first; i<first+count-1; i++, vert++) {
			draw_line_clip(&c->glverts.a[vert], &c->glverts.a[vert+1]);
		}
	} else if (mode == GL_LINE_LOOP) {
		for (vert=0, i=first; i<first+count-1; i++, vert++) {
			draw_line_clip(&c->glverts.a[vert], &c->glverts.a[vert+1]);
		}
		//draw ending line from last to first point
		draw_line_clip(&c->glverts.a[count-1], &c->glverts.a[0]);

	} else if (mode == GL_TRIANGLES) {
		provoke = (c->provoking_vert == GL_LAST_VERTEX_CONVENTION) ? 2 : 0;

		for (vert=0, i=first; i<first+count-2; i+=3, vert+=3) {
			draw_triangle(&c->glverts.a[vert], &c->glverts.a[vert+1], &c->glverts.a[vert+2], vert+provoke);
		}

	} else if (mode == GL_TRIANGLE_STRIP) {
		unsigned int a=0, b=1, toggle = 0;
		provoke = (c->provoking_vert == GL_LAST_VERTEX_CONVENTION) ? 0 : -2;

		for (vert=2; vert<count; ++vert) {
			draw_triangle(&c->glverts.a[a], &c->glverts.a[b], &c->glverts.a[vert], vert+provoke);

			if (!toggle)
				a = vert;
			else
				b = vert;

			toggle = !toggle;
		}
	} else if (mode == GL_TRIANGLE_FAN) {
		provoke = (c->provoking_vert == GL_LAST_VERTEX_CONVENTION) ? 0 : -1;

		for (vert=2; vert<count; ++vert) {
			draw_triangle(&c->glverts.a[0], &c->glverts.a[vert-1], &c->glverts.a[vert], vert+provoke);
		}
	}
}


static int depthtest(float zval, float zbufval)
{
	// TODO not sure if I should do this since it's supposed to prevent writing to the buffer
	// but not afaik, change the result of the test
	if (!c->depth_mask)
		return 0;

	switch (c->depth_func) {
	case GL_LESS:
		return zval < zbufval;
	case GL_LEQUAL:
		return zval <= zbufval;
	case GL_GREATER:
		return zval > zbufval;
	case GL_GEQUAL:
		return zval >= zbufval;
	case GL_EQUAL:
		return zval == zbufval;
	case GL_NOTEQUAL:
		return zval != zbufval;
	case GL_ALWAYS:
		return 1;
	case GL_NEVER:
		return 0;
	}
	return 0; //get rid of compile warning
}


static void setup_fs_input(float t, float* v1_out, float* v2_out, float wa, float wb, unsigned int provoke)
{
	float* vs_output = &c->vs_output.output_buf.a[0];

	float inv_wa = 1.0/wa;
	float inv_wb = 1.0/wb;

	for (int i=0; i<c->vs_output.size; ++i) {
		if (c->vs_output.interpolation[i] == SMOOTH) {
			c->fs_input[i] = (v1_out[i]*inv_wa + t*(v2_out[i]*inv_wb - v1_out[i]*inv_wa)) / (inv_wa + t*(inv_wb - inv_wa));

		} else if (c->vs_output.interpolation[i] == NOPERSPECTIVE) {
			c->fs_input[i] = v1_out[i] + t*(v2_out[i] - v1_out[i]);
		} else {
			c->fs_input[i] = vs_output[provoke*c->vs_output.size + i];
		}
	}

	c->builtins.discard = GL_FALSE;
}

/* Line Clipping algorithm from 'Computer Graphics', Principles and
   Practice */
static inline int clip_line(float denom, float num, float* tmin, float* tmax)
{
	float t;

	if (denom > 0) {
		t = num / denom;
		if (t > *tmax) return 0;
		if (t > *tmin) {
			*tmin = t;
			//printf("t > *tmin %f\n", t);
		}
	} else if (denom < 0) {
		t = num / denom;
		if (t < *tmin) return 0;
		if (t < *tmax) {
			*tmax = t;
			//printf("t < *tmax %f\n", t);
		}
	} else if (num > 0) return 0;
	return 1;
}


static void interpolate_clipped_line(glVertex* v1, glVertex* v2, float* v1_out, float* v2_out, float tmin, float tmax)
{
	for (int i=0; i<c->vs_output.size; ++i) {
		v1_out[i] = v1->vs_out[i] + (v2->vs_out[i] - v1->vs_out[i])*tmin;
		v2_out[i] = v1->vs_out[i] + (v2->vs_out[i] - v1->vs_out[i])*tmax;

		//v2_out[i] = (1 - tmax)*v1->vs_out[i] + tmax*v2->vs_out[i];
	}
}



static void draw_line_clip(glVertex* v1, glVertex* v2)
{
	int cc1, cc2;
	vec4 d, p1, p2, t1, t2;
	float tmin, tmax;

	cc1 = v1->clip_code;
	cc2 = v2->clip_code;

	p1 = v1->clip_space;
	p2 = v2->clip_space;
	
	float v1_out[GL_MAX_VERTEX_OUTPUT_COMPONENTS];
	float v2_out[GL_MAX_VERTEX_OUTPUT_COMPONENTS];

	//TODO ponder this
	unsigned int provoke;
	if (c->provoking_vert == GL_LAST_VERTEX_CONVENTION)
		provoke = (v2 - c->glverts.a)/sizeof(glVertex);
	else
		provoke = (v1 - c->glverts.a)/sizeof(glVertex);

	if (cc1 & cc2) {
		return;
	} else if ((cc1 | cc2) == 0) {
		t1 = mult_mat4_vec4(c->vp_mat, p1);
		t2 = mult_mat4_vec4(c->vp_mat, p2);

		//no need
		//memcpy(v1_out, v1->vs_out, c->vs_output.size*sizeof(float));
		//memcpy(v2_out, v2->vs_out, c->vs_output.size*sizeof(float));

		if (!c->line_smooth)
			draw_line_shader(t1, t2, v1->vs_out, v2->vs_out, provoke);
		else
			draw_line_smooth_shader(t1, t2, v1->vs_out, v2->vs_out, provoke);
	} else {

		d = sub_vec4s(p2, p1);

		tmin = 0;
		tmax = 1;
		if (clip_line( d.x+d.w, -p1.x-p1.w, &tmin, &tmax) &&
		    clip_line(-d.x+d.w,  p1.x-p1.w, &tmin, &tmax) &&
		    clip_line( d.y+d.w, -p1.y-p1.w, &tmin, &tmax) &&
		    clip_line(-d.y+d.w,  p1.y-p1.w, &tmin, &tmax) &&
			clip_line( d.z+d.w, -p1.z-p1.w, &tmin, &tmax) &&
			clip_line(-d.z+d.w,  p1.z-p1.w, &tmin, &tmax)) {

			//printf("%f %f\n", tmin, tmax);

			t1 = add_vec4s(p1, scale_vec4(d, tmin));
			t2 = add_vec4s(p1, scale_vec4(d, tmax));

			t1 = mult_mat4_vec4(c->vp_mat, t1);
			t2 = mult_mat4_vec4(c->vp_mat, t2);
			//print_vec4(t1, "\n");
			//print_vec4(t2, "\n");

			interpolate_clipped_line(v1, v2, v1_out, v2_out, tmin, tmax);

			if (!c->line_smooth)
				draw_line_shader(t1, t2, v1_out, v2_out, provoke);
			else
				draw_line_smooth_shader(t1, t2, v1_out, v2_out, provoke);
		}
	}
}


static void draw_line_shader(vec4 v1, vec4 v2, float* v1_out, float* v2_out, unsigned int provoke)
{
	float tmp;
	float* tmp_ptr;

	vec3 hp1 = vec4_to_vec3h(v1);
	vec3 hp2 = vec4_to_vec3h(v2);

	//print_vec3(hp1, "\n");
	//print_vec3(hp2, "\n");

	float w1 = v1.w;
	float w2 = v2.w;

	float x1 = hp1.x, x2 = hp2.x, y1 = hp1.y, y2 = hp2.y;
	float z1 = hp1.z, z2 = hp2.z;

	//always draw from left to right
	if (x2 < x1) {
		tmp = x1;
		x1 = x2;
		x2 = tmp;
		tmp = y1;
		y1 = y2;
		y2 = tmp;

		tmp = z1;
		z1 = z2;
		z2 = tmp;

		tmp = w1;
		w1 = w2;
		w2 = tmp;

		tmp_ptr = v1_out;
		v1_out = v2_out;
		v2_out = tmp_ptr;
	}

	//calculate slope and implicit line parameters once
	//could just use my Line type/constructor as in draw_triangle
	float m = (y2-y1)/(x2-x1);
	Line line = make_Line(x1, y1, x2, y2);

	float t, x, y, z, w;


	vec2 p1 = { x1, y1 }, p2 = { x2, y2 };
	vec2 pr, sub_p2p1 = sub_vec2s(p2, p1);
	float line_length_squared = length_vec2(sub_p2p1);
	line_length_squared *= line_length_squared;

	frag_func fragment_shader = c->programs.a[c->cur_program].fragment_shader;
	void* uniform = c->programs.a[c->cur_program].uniform;
	int fragdepth_or_discard = c->programs.a[c->cur_program].fragdepth_or_discard;

	float i_x1, i_y1, i_x2, i_y2;
	i_x1 = floor(p1.x) + 0.5;
	i_y1 = floor(p1.y) + 0.5;
	i_x2 = floor(p2.x) + 0.5;
	i_y2 = floor(p2.y) + 0.5;

	float x_min, x_max, y_min, y_max;
	x_min = i_x1;
	x_max = i_x2; //always left to right;
	if (m <= 0) {
		y_min = i_y2;
		y_max = i_y1;
	} else {
		y_min = i_y1;
		y_max = i_y2;
	}

	//printf("%f %f %f %f   =\n", i_x1, i_y1, i_x2, i_y2);
	//printf("%f %f %f %f   x_min etc\n", x_min, x_max, y_min, y_max);

	z1 = MAP(z1, -1.0f, 1.0f, c->depth_range_near, c->depth_range_far);
	z2 = MAP(z2, -1.0f, 1.0f, c->depth_range_near, c->depth_range_far);

	//4 cases based on slope
	if (m <= -1) {     //(-infinite, -1]
		//printf("slope <= -1\n");
		for (x = x_min, y = y_max; y>=y_min && x<=x_max; --y) {
			pr.x = x;
			pr.y = y;
			t = dot_vec2s(sub_vec2s(pr, p1), sub_p2p1) / line_length_squared;

			z = (1 - t) * z1 + t * z2;
			w = (1 - t) * w1 + t * w2;

			SET_VEC4(c->builtins.gl_FragCoord, x, y, z, 1/w);
			c->builtins.discard = GL_FALSE;
			c->builtins.gl_FragDepth = z;
			setup_fs_input(t, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, x, y);

line_1:
			if (line_func(&line, x+0.5f, y-1) < 0) //A*(x+0.5f) + B*(y-1) + C < 0)
				++x;
		}
	} else if (m <= 0) {     //(-1, 0]
		//printf("slope = (-1, 0]\n");
		for (x = x_min, y = y_max; x<=x_max && y>=y_min; ++x) {
			pr.x = x;
			pr.y = y;
			t = dot_vec2s(sub_vec2s(pr, p1), sub_p2p1) / line_length_squared;

			z = (1 - t) * z1 + t * z2;
			w = (1 - t) * w1 + t * w2;

			SET_VEC4(c->builtins.gl_FragCoord, x, y, z, 1/w);
			c->builtins.discard = GL_FALSE;
			c->builtins.gl_FragDepth = z;
			setup_fs_input(t, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, x, y);

line_2:
			if (line_func(&line, x+1, y-0.5f) > 0) //A*(x+1) + B*(y-0.5f) + C > 0)
				--y;
		}
	} else if (m <= 1) {     //(0, 1]
		//printf("slope = (0, 1]\n");
		for (x = x_min, y = y_min; x <= x_max && y <= y_max; ++x) {
			pr.x = x;
			pr.y = y;
			t = dot_vec2s(sub_vec2s(pr, p1), sub_p2p1) / line_length_squared;

			z = (1 - t) * z1 + t * z2;
			w = (1 - t) * w1 + t * w2;

			SET_VEC4(c->builtins.gl_FragCoord, x, y, z, 1/w);
			c->builtins.discard = GL_FALSE;
			c->builtins.gl_FragDepth = z;
			setup_fs_input(t, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, x, y);

line_3:
			if (line_func(&line, x+1, y+0.5f) < 0) //A*(x+1) + B*(y+0.5f) + C < 0)
				++y;
		}

	} else {    //(1, +infinite)
		//printf("slope > 1\n");
		for (x = x_min, y = y_min; y<=y_max && x <= x_max; ++y) {
			pr.x = x;
			pr.y = y;
			t = dot_vec2s(sub_vec2s(pr, p1), sub_p2p1) / line_length_squared;

			z = (1 - t) * z1 + t * z2;
			w = (1 - t) * w1 + t * w2;

			SET_VEC4(c->builtins.gl_FragCoord, x, y, z, 1/w);
			c->builtins.discard = GL_FALSE;
			c->builtins.gl_FragDepth = z;
			setup_fs_input(t, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, x, y);

line_4:
			if (line_func(&line, x+0.5f, y+1) > 0) //A*(x+0.5f) + B*(y+1) + C > 0)
				++x;
		}
	}
}

// WARNING: this function is subject to serious change or removal and is currently unused (GL_LINE_SMOOTH unsupported)
// TODO do it right, handle depth test correctly since we moved it into draw_pixel
static void draw_line_smooth_shader(vec4 v1, vec4 v2, float* v1_out, float* v2_out, unsigned int provoke)
{
	float tmp;
	float* tmp_ptr;

	frag_func fragment_shader = c->programs.a[c->cur_program].fragment_shader;
	void* uniform = c->programs.a[c->cur_program].uniform;
	int fragdepth_or_discard = c->programs.a[c->cur_program].fragdepth_or_discard;

	vec3 hp1 = vec4_to_vec3h(v1);
	vec3 hp2 = vec4_to_vec3h(v2);
	float x1 = hp1.x, x2 = hp2.x, y1 = hp1.y, y2 = hp2.y;
	float z1 = hp1.z, z2 = hp2.z;

	float w1 = v1.w;
	float w2 = v2.w;

	int x, j;

	int steep = fabsf(y2 - y1) > fabsf(x2 - x1);

	if (steep) {
		tmp = x1;
		x1 = y1;
		y1 = tmp;
		tmp = x2;
		x2 = y2;
		y2 = tmp;
	}
	if (x1 > x2) {
		tmp = x1;
		x1 = x2;
		x2 = tmp;
		tmp = y1;
		y1 = y2;
		y2 = tmp;

		tmp = z1;
		z1 = z2;
		z2 = tmp;

		tmp = w1;
		w1 = w2;
		w2 = tmp;

		tmp_ptr = v1_out;
		v1_out = v2_out;
		v2_out = tmp_ptr;
	}

	float dx = x2 - x1;
	float dy = y2 - y1;
	float gradient = dy / dx;

	float xend = x1 + 0.5f;
	float yend = y1 + gradient * (xend - x1);

	float xgap = 1.0 - modff(x1 + 0.5, &tmp);
	float xpxl1 = xend;
	float ypxl1;
	modff(yend, &ypxl1);


	//choose to compare against just one pixel for depth test instead of both
	z1 = MAP(z1, -1.0f, 1.0f, c->depth_range_near, c->depth_range_far);
	if (steep) {
		if (!c->depth_test || (!fragdepth_or_discard &&
			depthtest(z1, ((float*)c->zbuf.lastrow)[-(int)xpxl1*c->zbuf.w + (int)ypxl1]))) {

			if (!c->fragdepth_or_discard && c->depth_test) { //hate this double check but depth buf is only update if enabled
				((float*)c->zbuf.lastrow)[-(int)xpxl1*c->zbuf.w + (int)ypxl1] = z1;
				((float*)c->zbuf.lastrow)[-(int)xpxl1*c->zbuf.w + (int)(ypxl1+1)] = z1;
			}

			SET_VEC4(c->builtins.gl_FragCoord, ypxl1, xpxl1, z1, 1/w1);
			setup_fs_input(0, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			//fragcolor.w = (1.0 - modff(yend, &tmp)) * xgap;
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, ypxl1, xpxl1);

			SET_VEC4(c->builtins.gl_FragCoord, ypxl1+1, xpxl1, z1, 1/w1);
			setup_fs_input(0, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			//fragcolor.w = modff(yend, &tmp) * xgap;
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, ypxl1+1, xpxl1);
		}
	} else {
		if (!c->depth_test || (!fragdepth_or_discard &&
			depthtest(z1, ((float*)c->zbuf.lastrow)[-(int)ypxl1*c->zbuf.w + (int)xpxl1]))) {

			if (!c->fragdepth_or_discard && c->depth_test) { //hate this double check but depth buf is only update if enabled
				((float*)c->zbuf.lastrow)[-(int)ypxl1*c->zbuf.w + (int)xpxl1] = z1;
				((float*)c->zbuf.lastrow)[-(int)(ypxl1+1)*c->zbuf.w + (int)xpxl1] = z1;
			}

			SET_VEC4(c->builtins.gl_FragCoord, xpxl1, ypxl1, z1, 1/w1);
			setup_fs_input(0, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			//fragcolor.w = (1.0 - modff(yend, &tmp)) * xgap;
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, xpxl1, ypxl1);

			SET_VEC4(c->builtins.gl_FragCoord, xpxl1, ypxl1+1, z1, 1/w1);
			setup_fs_input(0, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			//fragcolor.w = modff(yend, &tmp) * xgap;
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, xpxl1, ypxl1+1);
		}
	}


	float intery = yend + gradient; //first y-intersection for main loop


	xend = x2 + 0.5f;
	yend = y2 + gradient * (xend - x2);

	xgap = modff(x2 + 0.5, &tmp);
	float xpxl2 = xend;
	float ypxl2;
	modff(yend, &ypxl2);

	z2 = MAP(z2, -1.0f, 1.0f, c->depth_range_near, c->depth_range_far);
	if (steep) {
		if (!c->depth_test || (!fragdepth_or_discard &&
			depthtest(z2, ((float*)c->zbuf.lastrow)[-(int)xpxl2*c->zbuf.w + (int)ypxl2]))) {

			if (!c->fragdepth_or_discard && c->depth_test) {
				((float*)c->zbuf.lastrow)[-(int)xpxl2*c->zbuf.w + (int)ypxl2] = z2;
				((float*)c->zbuf.lastrow)[-(int)xpxl2*c->zbuf.w + (int)(ypxl2+1)] = z2;
			}

			SET_VEC4(c->builtins.gl_FragCoord, ypxl2, xpxl2, z2, 1/w2);
			setup_fs_input(1, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			//fragcolor.w = (1.0 - modff(yend, &tmp)) * xgap;
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, ypxl2, xpxl2);

			SET_VEC4(c->builtins.gl_FragCoord, ypxl2+1, xpxl2, z2, 1/w2);
			setup_fs_input(1, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			//fragcolor.w = modff(yend, &tmp) * xgap;
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, ypxl2+1, xpxl2);
		}

	} else {
		if (!c->depth_test || (!fragdepth_or_discard &&
			depthtest(z2, ((float*)c->zbuf.lastrow)[-(int)ypxl2*c->zbuf.w + (int)xpxl2]))) {

			if (!c->fragdepth_or_discard && c->depth_test) {
				((float*)c->zbuf.lastrow)[-(int)ypxl2*c->zbuf.w + (int)xpxl2] = z2;
				((float*)c->zbuf.lastrow)[-(int)(ypxl2+1)*c->zbuf.w + (int)xpxl2] = z2;
			}

			SET_VEC4(c->builtins.gl_FragCoord, xpxl2, ypxl2, z2, 1/w2);
			setup_fs_input(1, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			//fragcolor.w = (1.0 - modff(yend, &tmp)) * xgap;
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, xpxl2, ypxl2);

			SET_VEC4(c->builtins.gl_FragCoord, xpxl2, ypxl2+1, z2, 1/w2);
			setup_fs_input(1, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			//fragcolor.w = modff(yend, &tmp) * xgap;
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, xpxl2, ypxl2+1);
		}
	}

	//use the fast, inaccurate calculation of t since this algorithm is already
	//slower than the normal line drawing, pg 111 glspec if I ever want to fix it
	float range = ceil(x2-x1);
	float t, z, w;
	for (j=1, x = xpxl1 + 1; x < xpxl2; ++x, ++j, intery += gradient) {
		t = j/range;

		z = (1 - t) * z1 + t * z2;
		w = (1 - t) * w1 + t * w2;

		if (steep) {
			if (!c->fragdepth_or_discard && c->depth_test) {
				if (!depthtest(z, ((float*)c->zbuf.lastrow)[-(int)x*c->zbuf.w + (int)intery])) {
					continue;
				} else {
					((float*)c->zbuf.lastrow)[-(int)x*c->zbuf.w + (int)intery] = z;
					((float*)c->zbuf.lastrow)[-(int)x*c->zbuf.w + (int)(intery+1)] = z;
				}
			}

			SET_VEC4(c->builtins.gl_FragCoord, intery, x, z, 1/w);
			setup_fs_input(t, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			//fragcolor.w = 1.0 - modff(intery, &tmp);
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, intery, x);

			SET_VEC4(c->builtins.gl_FragCoord, intery+1, x, z, 1/w);
			setup_fs_input(t, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			//fragcolor.w = modff(intery, &tmp);
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, intery+1, x);

		} else {
			if (!c->fragdepth_or_discard && c->depth_test) {
				if (!depthtest(z, ((float*)c->zbuf.lastrow)[-(int)intery*c->zbuf.w + (int)x])) {
					continue;
				} else {
					((float*)c->zbuf.lastrow)[-(int)intery*c->zbuf.w + (int)x] = z;
					((float*)c->zbuf.lastrow)[-(int)(intery+1)*c->zbuf.w + (int)x] = z;
				}
			}

			SET_VEC4(c->builtins.gl_FragCoord, x, intery, z, 1/w);
			setup_fs_input(t, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			//fragcolor.w = 1.0 - modff(intery, &tmp);
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, x, intery);

			SET_VEC4(c->builtins.gl_FragCoord, x, intery+1, z, 1/w);
			setup_fs_input(t, v1_out, v2_out, w1, w2, provoke);
			fragment_shader(c->fs_input, &c->builtins, uniform);
			//fragcolor.w = modff(intery, &tmp);
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, x, intery+1);

		}
	}
}


static void draw_triangle(glVertex* v0, glVertex* v1, glVertex* v2, unsigned int provoke)
{
	int c_or, c_and;

	c_and = v0->clip_code & v1->clip_code & v2->clip_code;
	if (c_and != 0) {
		//printf("triangle outside\n");
		return;
	}

	c_or = v0->clip_code | v1->clip_code | v2->clip_code;
	if (c_or == 0) {
		draw_triangle_final(v0, v1, v2, provoke);
	} else {
		draw_triangle_clip(v0, v1, v2, provoke, 0);
	}
}

static void draw_triangle_final(glVertex* v0, glVertex* v1, glVertex* v2, unsigned int provoke)
{
	int front_facing;
	v0->screen_space = mult_mat4_vec4(c->vp_mat, v0->clip_space);
	v1->screen_space = mult_mat4_vec4(c->vp_mat, v1->clip_space);
	v2->screen_space = mult_mat4_vec4(c->vp_mat, v2->clip_space);

	front_facing = is_front_facing(v0, v1, v2);
	if (c->cull_face) {
		if (c->cull_mode == GL_FRONT_AND_BACK)
			return;
		if (c->cull_mode == GL_BACK && !front_facing) {
			//printf("culling back face\n");
			return;
		}
		if (c->cull_mode == GL_FRONT && front_facing)
			return;
	}

	c->builtins.gl_FrontFacing = front_facing;

	if (front_facing) {
		c->draw_triangle_front(v0, v1, v2, provoke);
	} else {
		c->draw_triangle_back(v0, v1, v2, provoke);
	}
}


/* We clip the segment [a,b] against the 6 planes of the normal volume.
 * We compute the point 'c' of intersection and the value of the parameter 't'
 * of the intersection if x=a+t(b-a).
 */

#define clip_func(name, sign, dir, dir1, dir2) \
static float name(vec4 *c, vec4 *a, vec4 *b) \
{\
	float t, dx, dy, dz, dw, den;\
	dx = (b->x - a->x);\
	dy = (b->y - a->y);\
	dz = (b->z - a->z);\
	dw = (b->w - a->w);\
	den = -(sign d ## dir) + dw;\
	if (den == 0) t=0;\
	else t = ( sign a->dir - a->w) / den;\
	c->dir1 = a->dir1 + t * d ## dir1;\
	c->dir2 = a->dir2 + t * d ## dir2;\
	c->w = a->w + t * dw;\
	c->dir = sign c->w;\
	return t;\
}


clip_func(clip_xmin, -, x, y, z)

clip_func(clip_xmax, +, x, y, z)

clip_func(clip_ymin, -, y, x, z)

clip_func(clip_ymax, +, y, x, z)

clip_func(clip_zmin, -, z, x, y)

clip_func(clip_zmax, +, z, x, y)


static float (*clip_proc[6])(vec4 *, vec4 *, vec4 *) = {
	clip_zmin, clip_zmax,
	clip_xmin, clip_xmax,
	clip_ymin, clip_ymax
};

static inline void update_clip_pt(glVertex *q, glVertex *v0, glVertex *v1, float t)
{
	for (int i=0; i<c->vs_output.size; ++i) {
		//why is this correct for both SMOOTH and NOPERSPECTIVE?
		q->vs_out[i] = v0->vs_out[i] + (v1->vs_out[i] - v0->vs_out[i]) * t;

		//FLAT should be handled indirectly by the provoke index
		//nothing to do here unless I change that
	}
	
	q->clip_code = gl_clipcode(q->clip_space);
	/*
	 * this is done in draw_triangle currently ...
	q->screen_space = mult_mat4_vec4(c->vp_mat, q->clip_space);
	if (q->clip_code == 0)
		q->screen_space = mult_mat4_vec4(c->vp_mat, q->clip_space);
		*/
}




static void draw_triangle_clip(glVertex* v0, glVertex* v1, glVertex* v2, unsigned int provoke, int clip_bit)
{
	int c_or, c_and, c_ex_or, cc[3], edge_flag_tmp, clip_mask;
	glVertex tmp1, tmp2, *q[3];
	float tt;

	//quite a bit of stack if there's a lot of clipping ...
	float tmp1_out[GL_MAX_VERTEX_OUTPUT_COMPONENTS];
	float tmp2_out[GL_MAX_VERTEX_OUTPUT_COMPONENTS];

	tmp1.vs_out = tmp1_out;
	tmp2.vs_out = tmp2_out;

	cc[0] = v0->clip_code;
	cc[1] = v1->clip_code;
	cc[2] = v2->clip_code;
	/*
	printf("in draw_triangle_clip\n");
	print_vec4(v0->clip_space, "\n");
	print_vec4(v1->clip_space, "\n");
	print_vec4(v2->clip_space, "\n");
	printf("tmp_out tmp2_out = %p %p\n\n", tmp1_out, tmp2_out);
	*/


	c_or = cc[0] | cc[1] | cc[2];
	if (c_or == 0) {
		draw_triangle_final(v0, v1, v2, provoke);
	} else {
		c_and = cc[0] & cc[1] & cc[2];
		/* the triangle is completely outside */
		if (c_and != 0) {
			//printf("triangle outside\n");
			return;
		}

		/* find the next direction to clip */
		while (clip_bit < 6 && (c_or & (1 << clip_bit)) == 0)  {
			++clip_bit;
		}

		/* this test can be true only in case of rounding errors */
		if (clip_bit == 6) {
#if 1
			printf("Clipping error:\n");
			print_vec4(v0->clip_space, "\n");
			print_vec4(v1->clip_space, "\n");
			print_vec4(v2->clip_space, "\n");
#endif
			return;
		}

		clip_mask = 1 << clip_bit;
		c_ex_or = (cc[0] ^ cc[1] ^ cc[2]) & clip_mask;

		if (c_ex_or)  {
			/* one point outside */

			if (cc[0] & clip_mask) { q[0]=v0; q[1]=v1; q[2]=v2; }
			else if (cc[1] & clip_mask) { q[0]=v1; q[1]=v2; q[2]=v0; }
			else { q[0]=v2; q[1]=v0; q[2]=v1; }

			tt = clip_proc[clip_bit](&tmp1.clip_space, &q[0]->clip_space, &q[1]->clip_space);
			update_clip_pt(&tmp1, q[0], q[1], tt);

			tt = clip_proc[clip_bit](&tmp2.clip_space, &q[0]->clip_space, &q[2]->clip_space);
			update_clip_pt(&tmp2, q[0], q[2], tt);

			tmp1.edge_flag = q[0]->edge_flag;
			edge_flag_tmp = q[2]->edge_flag;
			q[2]->edge_flag = 0;
			draw_triangle_clip(&tmp1, q[1], q[2], provoke, clip_bit+1);

			tmp2.edge_flag = 1;
			tmp1.edge_flag = 0;
			q[2]->edge_flag = edge_flag_tmp;
			draw_triangle_clip(&tmp2, &tmp1, q[2], provoke, clip_bit+1);
		} else {
			/* two points outside */

			if ((cc[0] & clip_mask) == 0) { q[0]=v0; q[1]=v1; q[2]=v2; }
			else if ((cc[1] & clip_mask) == 0) { q[0]=v1; q[1]=v2; q[2]=v0; }
			else { q[0]=v2; q[1]=v0; q[2]=v1; }

			tt = clip_proc[clip_bit](&tmp1.clip_space, &q[0]->clip_space, &q[1]->clip_space);
			update_clip_pt(&tmp1, q[0], q[1], tt);

			tt = clip_proc[clip_bit](&tmp2.clip_space, &q[0]->clip_space, &q[2]->clip_space);
			update_clip_pt(&tmp2, q[0], q[2], tt);

			tmp1.edge_flag = 1;
			tmp2.edge_flag = q[2]->edge_flag;
			draw_triangle_clip(q[0], &tmp1, &tmp2, provoke, clip_bit+1);
		}
	}
}

static void draw_triangle_point(glVertex* v0, glVertex* v1,  glVertex* v2, unsigned int provoke)
{
	//TODO provoke?
	float fs_input[GL_MAX_VERTEX_OUTPUT_COMPONENTS];
	vec3 point;
	glVertex* vert[3] = { v0, v1, v2 };

	for (int i=0; i<3; ++i) {
		if (!vert[i]->edge_flag) //TODO doesn't work
			continue;

		point = vec4_to_vec3h(vert[i]->screen_space);
		point.z = MAP(point.z, -1.0f, 1.0f, c->depth_range_near, c->depth_range_far);

		//TODO not sure if I'm supposed to do this ... doesn't say to in spec but it is called depth clamping
		if (c->depth_clamp)
			point.z = clampf_01(point.z);

		for (int j=0; j<c->vs_output.size; ++j) {
			if (c->vs_output.interpolation[j] != FLAT) {
				fs_input[j] = vert[i]->vs_out[j]; //would be correct from clipping
			} else {
				fs_input[j] = c->vs_output.output_buf.a[provoke*c->vs_output.size + j];
			}
		}

		c->builtins.discard = GL_FALSE;
		c->programs.a[c->cur_program].fragment_shader(fs_input, &c->builtins, c->programs.a[c->cur_program].uniform);
		if (!c->builtins.discard)
			draw_pixel(c->builtins.gl_FragColor, point.x, point.y);
	}
}

static void draw_triangle_line(glVertex* v0, glVertex* v1,  glVertex* v2, unsigned int provoke)
{
	if (v0->edge_flag)
		draw_line_shader(v0->screen_space, v1->screen_space, v0->vs_out, v1->vs_out, provoke);
	if (v1->edge_flag)
		draw_line_shader(v1->screen_space, v2->screen_space, v1->vs_out, v2->vs_out, provoke);
	if (v2->edge_flag)
		draw_line_shader(v2->screen_space, v0->screen_space, v2->vs_out, v0->vs_out, provoke);
}


static void draw_triangle_fill(glVertex* v0, glVertex* v1, glVertex* v2, unsigned int provoke)
{
	vec4 p0 = v0->screen_space;
	vec4 p1 = v1->screen_space;
	vec4 p2 = v2->screen_space;

	vec3 hp0 = vec4_to_vec3h(p0);
	vec3 hp1 = vec4_to_vec3h(p1);
	vec3 hp2 = vec4_to_vec3h(p2);

	// TODO even worth calculating or just some constant?
	float max_depth_slope = 0;
	float poly_offset = 0;

	if (c->poly_offset) {
		float dzxy[6];
		dzxy[0] = fabsf((hp1.z - hp0.z)/(hp1.x - hp0.x));
		dzxy[1] = fabsf((hp1.z - hp0.z)/(hp1.y - hp0.y));
		dzxy[2] = fabsf((hp2.z - hp1.z)/(hp2.x - hp1.x));
		dzxy[3] = fabsf((hp2.z - hp1.z)/(hp2.y - hp1.y));
		dzxy[4] = fabsf((hp0.z - hp2.z)/(hp0.x - hp2.x));
		dzxy[5] = fabsf((hp0.z - hp2.z)/(hp0.y - hp2.y));

		max_depth_slope = dzxy[0];
		for (int i=1; i<6; ++i) {
			if (dzxy[i] > max_depth_slope)
				max_depth_slope = dzxy[i];
		}

#define SMALLEST_INCR 0.000001;
		poly_offset = max_depth_slope * c->poly_factor + c->poly_units * SMALLEST_INCR;
	}

	/*
	print_vec4(hp0, "\n");
	print_vec4(hp1, "\n");
	print_vec4(hp2, "\n");

	printf("%f %f %f\n", p0.w, p1.w, p2.w);
	print_vec3(hp0, "\n");
	print_vec3(hp1, "\n");
	print_vec3(hp2, "\n\n");
	*/

	//can't think of a better/cleaner way to do this than these 8 lines
	float x_min = MIN(hp0.x, hp1.x);
	float x_max = MAX(hp0.x, hp1.x);
	float y_min = MIN(hp0.y, hp1.y);
	float y_max = MAX(hp0.y, hp1.y);

	x_min = MIN(hp2.x, x_min);
	x_max = MAX(hp2.x, x_max);
	y_min = MIN(hp2.y, y_min);
	y_max = MAX(hp2.y, y_max);



	/*
	 * testing without this
	x_min = MAX(0, x_min);
	x_max = MIN(c->back_buffer.w-1, x_max);
	y_min = MAX(0, y_min);
	y_max = MIN(c->back_buffer.h-1, y_max);

	x_min = MAX(c->x_min, x_min);
	x_max = MIN(c->x_max, x_max);
	y_min = MAX(c->y_min, y_min);
	y_max = MIN(c->y_max, y_max);
	*/

	//form implicit lines
	Line l01 = make_Line(hp0.x, hp0.y, hp1.x, hp1.y);
	Line l12 = make_Line(hp1.x, hp1.y, hp2.x, hp2.y);
	Line l20 = make_Line(hp2.x, hp2.y, hp0.x, hp0.y);

	float alpha, beta, gamma, tmp, tmp2, z;
	float fs_input[GL_MAX_VERTEX_OUTPUT_COMPONENTS];
	float perspective[GL_MAX_VERTEX_OUTPUT_COMPONENTS*3];
	float* vs_output = &c->vs_output.output_buf.a[0];

	for (int i=0; i<c->vs_output.size; ++i) {
		perspective[i] = v0->vs_out[i]/p0.w;
		perspective[GL_MAX_VERTEX_OUTPUT_COMPONENTS + i] = v1->vs_out[i]/p1.w;
		perspective[2*GL_MAX_VERTEX_OUTPUT_COMPONENTS + i] = v2->vs_out[i]/p2.w;
	}
	float inv_w0 = 1/p0.w;  //is this worth it?  faster than just dividing by w down below?
	float inv_w1 = 1/p1.w;
	float inv_w2 = 1/p2.w;

	float x;
	float y = floor(y_min) + 0.5; //center of min pixel

	for (; y<=y_max; ++y) {
		x = floor(x_min) + 0.5; //center of min pixel

		for (; x<=x_max; ++x) {
			//see page 117 of glspec for alternative method
			gamma = line_func(&l01, x, y)/line_func(&l01, hp2.x, hp2.y);
			beta = line_func(&l20, x, y)/line_func(&l20, hp1.x, hp1.y);
			alpha = 1 - beta - gamma;

			if (alpha >= 0 && beta >= 0 && gamma >= 0) {
				//if it's on the edge (==0), draw if the opposite vertex is on the same side as arbitrary point -1, -2.5
				//this is a deterministic way of choosing which triangle gets a pixel for triangles that share
				//edges (see commit message for e87e324)
				if ((alpha > 0 || line_func(&l12, hp0.x, hp0.y) * line_func(&l12, -1, -2.5) > 0) &&
				    (beta  > 0 || line_func(&l20, hp1.x, hp1.y) * line_func(&l20, -1, -2.5) > 0) &&
				    (gamma > 0 || line_func(&l01, hp2.x, hp2.y) * line_func(&l01, -1, -2.5) > 0)) {
					//calculate interoplation here
					tmp2 = alpha*inv_w0 + beta*inv_w1 + gamma*inv_w2;

					z = alpha * hp0.z + beta * hp1.z + gamma * hp2.z;

					z = MAP(z, -1.0f, 1.0f, c->depth_range_near, c->depth_range_far); //TODO move out (ie can I map hp1.z etc.)?
					z += poly_offset;

					// TODO have a macro that turns on pre-fragment shader depthtest/scissor test?

					for (int i=0; i<c->vs_output.size; ++i) {
						if (c->vs_output.interpolation[i] == SMOOTH) {
							tmp = alpha*perspective[i] + beta*perspective[GL_MAX_VERTEX_OUTPUT_COMPONENTS + i] + gamma*perspective[2*GL_MAX_VERTEX_OUTPUT_COMPONENTS + i];

							fs_input[i] = tmp/tmp2;

						} else if (c->vs_output.interpolation[i] == NOPERSPECTIVE) {
							fs_input[i] = alpha * v0->vs_out[i] + beta * v1->vs_out[i] + gamma * v2->vs_out[i];
						} else { // == FLAT
							fs_input[i] = vs_output[provoke*c->vs_output.size + i];
						}
					}

					// tmp2 is 1/w interpolated... I now do that everywhere (draw_line, draw_point)
					SET_VEC4(c->builtins.gl_FragCoord, x, y, z, tmp2);
					c->builtins.discard = GL_FALSE;
					c->builtins.gl_FragDepth = z;
					c->programs.a[c->cur_program].fragment_shader(fs_input, &c->builtins, c->programs.a[c->cur_program].uniform);
					if (!c->builtins.discard) {

						draw_pixel(c->builtins.gl_FragColor, x, y);
					}
				}
			}
		}
	}
}


// TODO should this be done in colors/integers not vec4/floats?
static Color blend_pixel(vec4 src, vec4 dst)
{
	vec4* cnst = &c->blend_color;
	float i = MIN(src.w, 1-dst.w);

	vec4 Cs, Cd;

	switch (c->blend_sfactor) {
	case GL_ZERO:                     SET_VEC4(Cs, 0,0,0,0);                                 break;
	case GL_ONE:                      SET_VEC4(Cs, 1,1,1,1);                                 break;
	case GL_SRC_COLOR:                Cs = src;                                              break;
	case GL_ONE_MINUS_SRC_COLOR:      SET_VEC4(Cs, 1-src.x,1-src.y,1-src.z,1-src.w);         break;
	case GL_DST_COLOR:                Cs = dst;                                              break;
	case GL_ONE_MINUS_DST_COLOR:      SET_VEC4(Cs, 1-dst.x,1-dst.y,1-dst.z,1-dst.w);         break;
	case GL_SRC_ALPHA:                SET_VEC4(Cs, src.w, src.w, src.w, src.w);              break;
	case GL_ONE_MINUS_SRC_ALPHA:      SET_VEC4(Cs, 1-src.w,1-src.w,1-src.w,1-src.w);         break;
	case GL_DST_ALPHA:                SET_VEC4(Cs, dst.w, dst.w, dst.w, dst.w);              break;
	case GL_ONE_MINUS_DST_ALPHA:      SET_VEC4(Cs, 1-dst.w,1-dst.w,1-dst.w,1-dst.w);         break;
	case GL_CONSTANT_COLOR:           Cs = *cnst;                                            break;
	case GL_ONE_MINUS_CONSTANT_COLOR: SET_VEC4(Cs, 1-cnst->x,1-cnst->y,1-cnst->z,1-cnst->w); break;
	case GL_CONSTANT_ALPHA:           SET_VEC4(Cs, cnst->w, cnst->w, cnst->w, cnst->w);      break;
	case GL_ONE_MINUS_CONSTANT_ALPHA: SET_VEC4(Cs, 1-cnst->w,1-cnst->w,1-cnst->w,1-cnst->w); break;

	case GL_SRC_ALPHA_SATURATE:       SET_VEC4(Cs, i, i, i, 1);                              break;
	/*not implemented yet
	 * won't be until I implement dual source blending/dual output from frag shader
	 *https://www.opengl.org/wiki/Blending#Dual_Source_Blending
	case GL_SRC1_COLOR:               Cs =  break;
	case GL_ONE_MINUS_SRC1_COLOR:     Cs =  break;
	case GL_SRC1_ALPHA:               Cs =  break;
	case GL_ONE_MINUS_SRC1_ALPHA:     Cs =  break;
	*/
	default:
		//should never get here
		printf("error unrecognized blend_sfactor!\n");
		break;
	}

	switch (c->blend_dfactor) {
	case GL_ZERO:                     SET_VEC4(Cd, 0,0,0,0);                                 break;
	case GL_ONE:                      SET_VEC4(Cd, 1,1,1,1);                                 break;
	case GL_SRC_COLOR:                Cd = src;                                              break;
	case GL_ONE_MINUS_SRC_COLOR:      SET_VEC4(Cd, 1-src.x,1-src.y,1-src.z,1-src.w);         break;
	case GL_DST_COLOR:                Cd = dst;                                              break;
	case GL_ONE_MINUS_DST_COLOR:      SET_VEC4(Cd, 1-dst.x,1-dst.y,1-dst.z,1-dst.w);         break;
	case GL_SRC_ALPHA:                SET_VEC4(Cd, src.w, src.w, src.w, src.w);              break;
	case GL_ONE_MINUS_SRC_ALPHA:      SET_VEC4(Cd, 1-src.w,1-src.w,1-src.w,1-src.w);         break;
	case GL_DST_ALPHA:                SET_VEC4(Cd, dst.w, dst.w, dst.w, dst.w);              break;
	case GL_ONE_MINUS_DST_ALPHA:      SET_VEC4(Cd, 1-dst.w,1-dst.w,1-dst.w,1-dst.w);         break;
	case GL_CONSTANT_COLOR:           Cd = *cnst;                                            break;
	case GL_ONE_MINUS_CONSTANT_COLOR: SET_VEC4(Cd, 1-cnst->x,1-cnst->y,1-cnst->z,1-cnst->w); break;
	case GL_CONSTANT_ALPHA:           SET_VEC4(Cd, cnst->w, cnst->w, cnst->w, cnst->w);      break;
	case GL_ONE_MINUS_CONSTANT_ALPHA: SET_VEC4(Cd, 1-cnst->w,1-cnst->w,1-cnst->w,1-cnst->w); break;

	case GL_SRC_ALPHA_SATURATE:       SET_VEC4(Cd, i, i, i, 1);                              break;
	/*not implemented yet
	case GL_SRC_ALPHA_SATURATE:       Cd =  break;
	case GL_SRC1_COLOR:               Cd =  break;
	case GL_ONE_MINUS_SRC1_COLOR:     Cd =  break;
	case GL_SRC1_ALPHA:               Cd =  break;
	case GL_ONE_MINUS_SRC1_ALPHA:     Cd =  break;
	*/
	default:
		//should never get here
		printf("error unrecognized blend_dfactor!\n");
		break;
	}

	vec4 result;

	switch (c->blend_equation) {
	case GL_FUNC_ADD:
		result = add_vec4s(mult_vec4s(Cs, src), mult_vec4s(Cd, dst));
		break;
	case GL_FUNC_SUBTRACT:
		result = sub_vec4s(mult_vec4s(Cs, src), mult_vec4s(Cd, dst));
		break;
	case GL_FUNC_REVERSE_SUBTRACT:
		result = sub_vec4s(mult_vec4s(Cd, dst), mult_vec4s(Cs, src));
		break;
	case GL_MIN:
		SET_VEC4(result, MIN(src.x, dst.x), MIN(src.y, dst.y), MIN(src.z, dst.z), MIN(src.w, dst.w));
		break;
	case GL_MAX:
		SET_VEC4(result, MAX(src.x, dst.x), MAX(src.y, dst.y), MAX(src.z, dst.z), MAX(src.w, dst.w));
		break;
	default:
		//should never get here
		printf("error unrecognized blend_equation!\n");
		break;
	}

	return vec4_to_Color(result);
}

// source and destination colors
static Color logic_ops_pixel(Color s, Color d)
{
	switch (c->logic_func) {
	case GL_CLEAR:
		return make_Color(0,0,0,0);
	case GL_SET:
		return make_Color(255,255,255,255);
	case GL_COPY:
		return s;
	case GL_COPY_INVERTED:
		return make_Color(~s.r, ~s.g, ~s.b, ~s.a);
	case GL_NOOP:
		return d;
	case GL_INVERT:
		return make_Color(~d.r, ~d.g, ~d.b, ~d.a);
	case GL_AND:
		return make_Color(s.r & d.r, s.g & d.g, s.b & d.b, s.a & d.a);
	case GL_NAND:
		return make_Color(~(s.r & d.r), ~(s.g & d.g), ~(s.b & d.b), ~(s.a & d.a));
	case GL_OR:
		return make_Color(s.r | d.r, s.g | d.g, s.b | d.b, s.a | d.a);
	case GL_NOR:
		return make_Color(~(s.r | d.r), ~(s.g | d.g), ~(s.b | d.b), ~(s.a | d.a));
	case GL_XOR:
		return make_Color(s.r ^ d.r, s.g ^ d.g, s.b ^ d.b, s.a ^ d.a);
	case GL_EQUIV:
		return make_Color(~(s.r ^ d.r), ~(s.g ^ d.g), ~(s.b ^ d.b), ~(s.a ^ d.a));
	case GL_AND_REVERSE:
		return make_Color(s.r & ~d.r, s.g & ~d.g, s.b & ~d.b, s.a & ~d.a);
	case GL_AND_INVERTED:
		return make_Color(~s.r & d.r, ~s.g & d.g, ~s.b & d.b, ~s.a & d.a);
	case GL_OR_REVERSE:
		return make_Color(s.r | ~d.r, s.g | ~d.g, s.b | ~d.b, s.a | ~d.a);
	case GL_OR_INVERTED:
		return make_Color(~s.r | d.r, ~s.g | d.g, ~s.b | d.b, ~s.a | d.a);
	default:
		puts("Unrecognized logic op!, defaulting to GL_COPY");
		return s;
	}

}

static int stencil_test(u8 stencil)
{
	int func, ref, mask;
	// TODO what about non-triangles, should use front values, so need to make sure that's set?
	if (c->builtins.gl_FrontFacing) {
		func = c->stencil_func;
		ref = c->stencil_ref;
		mask = c->stencil_valuemask;
	} else {
		func = c->stencil_func_back;
		ref = c->stencil_ref_back;
		mask = c->stencil_valuemask_back;
	}
	switch (func) {
	case GL_NEVER:    return 0;
	case GL_LESS:     return (ref & mask) < (stencil & mask);
	case GL_LEQUAL:   return (ref & mask) <= (stencil & mask);
	case GL_GREATER:  return (ref & mask) > (stencil & mask);
	case GL_GEQUAL:   return (ref & mask) >= (stencil & mask);
	case GL_EQUAL:    return (ref & mask) == (stencil & mask);
	case GL_NOTEQUAL: return (ref & mask) != (stencil & mask);
	case GL_ALWAYS:   return 1;
	default:
		puts("Error: unrecognized stencil function!");
		return 0;
	}

}

static void stencil_op(int stencil, int depth, u8* dest)
{
	int op, ref, mask;
	// make them proper arrays in gl_context?
	GLenum* ops;
	// TODO what about non-triangles, should use front values, so need to make sure that's set?
	if (c->builtins.gl_FrontFacing) {
		ops = &c->stencil_sfail;
		ref = c->stencil_ref;
		mask = c->stencil_writemask;
	} else {
		ops = &c->stencil_sfail_back;
		ref = c->stencil_ref_back;
		mask = c->stencil_writemask_back;
	}
	op = (!stencil) ? ops[0] : ((!depth) ? ops[1] : ops[2]);

	u8 val = *dest;
	switch (op) {
	case GL_KEEP: return;
	case GL_ZERO: val = 0; break;
	case GL_REPLACE: val = ref; break;
	case GL_INCR: if (val < 255) val++; break;
	case GL_INCR_WRAP: val++; break;
	case GL_DECR: if (val > 0) val--; break;
	case GL_DECR_WRAP: val--; break;
	case GL_INVERT: val = ~val;
	}

	*dest = val & mask;

}

static void draw_pixel_vec2(vec4 cf, vec2 pos)
{
/*
 * spec pg 110:
Point rasterization produces a fragment for each framebuffer pixel whose center
lies inside a square centered at the point’s (x w , y w ), with side length equal to the
current point size.

for a 1 pixel size point there are only 3 edge cases where more than 1 pixel center (0.5, 0.5)
would fall on the very edge of a 1 pixel square.  I think just drawing the upper or upper
corner pixel in these cases is fine and makes sense since width and height are actually 0.01 less
than full, see make_viewport_matrix
TODO point size > 1
*/

	draw_pixel(cf, pos.x, pos.y);
}


static void draw_pixel(vec4 cf, int x, int y)
{
	if (c->scissor_test) {
		if (x < c->scissor_lx || y < c->scissor_ly || x >= c->scissor_ux || y >= c->scissor_uy) {
			return;
		}
	}

	//MSAA
	
	//Stencil Test TODO have to handle when there is no stencil or depth buffer 
	//(change gl_init to make stencil and depth buffers optional)
	u8* stencil_dest = &c->stencil_buf.lastrow[-y*c->stencil_buf.w + x];
	if (c->stencil_test) {
		if (!stencil_test(*stencil_dest)) {
			stencil_op(0, 1, stencil_dest);
			return;
		}
	}
	

	//Depth test if necessary
	if (c->depth_test) {
		// I made gl_FragDepth read/write, ie same == to gl_FragCoord.z going into the shader
		// so I can just always use gl_FragDepth here
		float dest_depth = ((float*)c->zbuf.lastrow)[-y*c->zbuf.w + x];
		float src_depth = c->builtins.gl_FragDepth;  // pass as parameter?

		int depth_result = depthtest(src_depth, dest_depth);

		if (c->stencil_test) {
			stencil_op(1, depth_result, stencil_dest);
		}
		if (!depth_result) {
			return;
		}
		((float*)c->zbuf.lastrow)[-y*c->zbuf.w + x] = src_depth;
	} else if (c->stencil_test) {
		stencil_op(1, 1, stencil_dest);
	}

	//Blending
	Color dest_color, src_color;
	u32* dest = &((u32*)c->back_buffer.lastrow)[-y*c->back_buffer.w + x];
	dest_color = make_Color((*dest & c->Rmask) >> c->Rshift, (*dest & c->Gmask) >> c->Gshift, (*dest & c->Bmask) >> c->Bshift, (*dest & c->Amask) >> c->Ashift);

	if (c->blend) {
		//TODO clamp in blend_pixel?  return the vec4 and clamp?
		src_color = blend_pixel(cf, Color_to_vec4(dest_color));
	} else {
		cf.x = clampf_01(cf.x);
		cf.y = clampf_01(cf.y);
		cf.z = clampf_01(cf.z);
		cf.w = clampf_01(cf.w);
		src_color = vec4_to_Color(cf);
	}
	//this line neded the negation in the viewport matrix
	//((u32*)c->back_buffer.buf)[y*buf.w+x] = c.a << 24 | c.c << 16 | c.g << 8 | c.b;

	//Logic Ops
	if (c->logic_ops) {
		src_color = logic_ops_pixel(src_color, dest_color);
	}


	//Dithering

	//((u32*)c->back_buffer.buf)[(buf.h-1-y)*buf.w + x] = c.a << 24 | c.c << 16 | c.g << 8 | c.b;
	//((u32*)c->back_buffer.lastrow)[-y*c->back_buffer.w + x] = c.a << 24 | c.c << 16 | c.g << 8 | c.b;
	*dest = src_color.a << c->Ashift | src_color.r << c->Rshift | src_color.g << c->Gshift | src_color.b << c->Bshift;
}



#include <stdarg.h>


/******************************************
 * PORTABLEGL_IMPLEMENTATION
 ******************************************/

#include <stdio.h>
#include <assert.h>
#include <float.h>

// for CHAR_BIT
#include <limits.h>



#ifdef DEBUG
#define IS_VALID(target, error, ...) is_valid(target, error, __VA_ARGS__)
#else
#define IS_VALID(target, error, ...) 1
#endif

int is_valid(GLenum target, GLenum error, int n, ...)
{
	va_list argptr;

	va_start(argptr, n);
	for (int i=0; i<n; ++i) {
		if (target == va_arg(argptr, GLenum)) {
			return 1;
		}
	}
	va_end(argptr);

	if (!c->error) {
		c->error = error;
	}
	return 0;
}








// default pass through shaders for index 0
void default_vs(float* vs_output, void* vertex_attribs, Shader_Builtins* builtins, void* uniforms)
{
	builtins->gl_Position = ((vec4*)vertex_attribs)[0];
}

void default_fs(float* fs_input, Shader_Builtins* builtins, void* uniforms)
{
	vec4* fragcolor = &builtins->gl_FragColor;
	//wish I could use a compound literal, stupid C++ compatibility
	fragcolor->x = 1.0f;
	fragcolor->y = 0.0f;
	fragcolor->z = 0.0f;
	fragcolor->w = 1.0f;
}


void init_glVertex_Array(glVertex_Array* v)
{
	v->deleted = GL_FALSE;
	for (int i=0; i<GL_MAX_VERTEX_ATTRIBS; ++i)
		init_glVertex_Attrib(&v->vertex_attribs[i]);
}

void init_glVertex_Attrib(glVertex_Attrib* v)
{
	/*
	GLint size;      // number of components 1-4
	GLenum type;     // GL_FLOAT, default
	GLsizei stride;  //
	GLsizei offset;  //
	GLboolean normalized;
	unsigned int buf;
	GLboolean enabled;
	GLuint divisor;
*/
	v->buf = 0;
	v->enabled = 0;
	v->divisor = 0;
}


#define GET_SHIFT(mask, shift) \
	do {\
	shift = 0;\
	while ((mask & 1) == 0) {\
		mask >>= 1;\
		++shift;\
	}\
	} while (0)


int init_glContext(glContext* context, u32** back, int w, int h, int bitdepth, u32 Rmask, u32 Gmask, u32 Bmask, u32 Amask)
{
	if (bitdepth > 32 || !back)
		return 0;

	context->user_alloced_backbuf = *back != NULL;
	if (!*back) {
		int bytes_per_pixel = (bitdepth + CHAR_BIT-1) / CHAR_BIT;
		*back = (u32*) malloc(w * h * bytes_per_pixel);
		if (!*back)
			return 0;
	}

	context->zbuf.buf = (u8*) malloc(w*h * sizeof(float));
	if (!context->zbuf.buf) {
		if (!context->user_alloced_backbuf) {
			free(*back);
			*back = NULL;
		}
		return 0;
	}

	context->stencil_buf.buf = (u8*) malloc(w*h);
	if (!context->stencil_buf.buf) {
		if (!context->user_alloced_backbuf) {
			free(*back);
			*back = NULL;
		}
		free(context->zbuf.buf);
		return 0;
	}

	context->x_min = 0;
	context->y_min = 0;
	context->x_max = w;
	context->y_max = h;

	context->zbuf.w = w;
	context->zbuf.h = h;
	context->zbuf.lastrow = context->zbuf.buf + (h-1)*w*sizeof(float);

	context->stencil_buf.w = w;
	context->stencil_buf.h = h;
	context->stencil_buf.lastrow = context->stencil_buf.buf + (h-1)*w;

	context->back_buffer.w = w;
	context->back_buffer.h = h;
	context->back_buffer.buf = (u8*) *back;
	context->back_buffer.lastrow = context->back_buffer.buf + (h-1)*w*sizeof(u32);

	context->bitdepth = bitdepth; //not used yet
	context->Rmask = Rmask;
	context->Gmask = Gmask;
	context->Bmask = Bmask;
	context->Amask = Amask;
	GET_SHIFT(Rmask, context->Rshift);
	GET_SHIFT(Gmask, context->Gshift);
	GET_SHIFT(Bmask, context->Bshift);
	GET_SHIFT(Amask, context->Ashift);

	//initialize all vectors
	cvec_glVertex_Array(&context->vertex_arrays, 0, 3);
	cvec_glBuffer(&context->buffers, 0, 3);
	cvec_glProgram(&context->programs, 0, 3);
	cvec_glTexture(&context->textures, 0, 1);
	cvec_glVertex(&context->glverts, 0, 10);

	//TODO might as well just set it to MAX_VERTICES * MAX_OUTPUT_COMPONENTS
	cvec_float(&context->vs_output.output_buf, 0, 0);


	context->clear_stencil = 0;
	context->clear_color = make_Color(0, 0, 0, 0);
	SET_VEC4(context->blend_color, 0, 0, 0, 0);
	context->point_size = 1.0f;
	context->clear_depth = 1.0f;
	context->depth_range_near = 0.0f;
	context->depth_range_far = 1.0f;
	make_viewport_matrix(context->vp_mat, 0, 0, w, h, 1);


	//set flags
	//TODO match order in structure definition
	context->provoking_vert = GL_LAST_VERTEX_CONVENTION;
	context->cull_mode = GL_BACK;
	context->cull_face = GL_FALSE;
	context->front_face = GL_CCW;
	context->depth_test = GL_FALSE;
	context->fragdepth_or_discard = GL_FALSE;
	context->depth_clamp = GL_FALSE;
	context->depth_mask = GL_TRUE;
	context->blend = GL_FALSE;
	context->logic_ops = GL_FALSE;
	context->poly_offset = GL_FALSE;
	context->scissor_test = GL_FALSE;

	context->stencil_test = GL_FALSE;
	context->stencil_writemask = -1; // all 1s for the masks
	context->stencil_writemask_back = -1;
	context->stencil_ref = 0;
	context->stencil_ref_back = 0;
	context->stencil_valuemask = -1;
	context->stencil_valuemask_back = -1;
	context->stencil_func = GL_ALWAYS;
	context->stencil_func_back = GL_ALWAYS;
	context->stencil_sfail = GL_KEEP;
	context->stencil_dpfail = GL_KEEP;
	context->stencil_dppass = GL_KEEP;
	context->stencil_sfail_back = GL_KEEP;
	context->stencil_dpfail_back = GL_KEEP;
	context->stencil_dppass_back = GL_KEEP;

	context->logic_func = GL_COPY;
	context->blend_sfactor = GL_ONE;
	context->blend_dfactor = GL_ZERO;
	context->blend_equation = GL_FUNC_ADD;
	context->depth_func = GL_LESS;
	context->line_smooth = GL_FALSE;
	context->poly_mode_front = GL_FILL;
	context->poly_mode_back = GL_FILL;
	context->point_spr_origin = GL_UPPER_LEFT;

	context->poly_factor = 0.0f;
	context->poly_units = 0.0f;

	context->scissor_lx = 0;
	context->scissor_ly = 0;
	context->scissor_ux = w;
	context->scissor_uy = h;

	// According to refpages https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/glPixelStore.xhtml
	context->unpack_alignment = 4;
	context->pack_alignment = 4;

	context->draw_triangle_front = draw_triangle_fill;
	context->draw_triangle_back = draw_triangle_fill;

	context->error = GL_NO_ERROR;

	//program 0 is supposed to be undefined but not invalid so I'll
	//just make it default
	glProgram tmp_prog = { default_vs, default_fs, NULL, GL_FALSE };
	cvec_push_glProgram(&context->programs, tmp_prog);
	context->cur_program = 0;

	//setup default vertex_array (vao) at position 0
	//we're like a compatibility profile for this but come on
	//no reason not to have this imo
	//https://www.opengl.org/wiki/Vertex_Specification#Vertex_Array_Object
	glVertex_Array tmp_va;
	init_glVertex_Array(&tmp_va);
	cvec_push_glVertex_Array(&context->vertex_arrays, tmp_va);
	context->cur_vertex_array = 0;

	//setup buffers and textures
	//need to push back once since 0 is invalid
	//valid buffers have to start at position 1
	glBuffer tmp_buf;
	tmp_buf.user_owned = GL_TRUE;
	tmp_buf.deleted = GL_FALSE;

	glTexture tmp_tex;
	tmp_tex.user_owned = GL_TRUE;
	tmp_tex.deleted = GL_FALSE;
	tmp_tex.format = GL_RGBA;
	tmp_tex.type = GL_TEXTURE_UNBOUND;
	tmp_tex.data = NULL;
	tmp_tex.w = 0;
	tmp_tex.h = 0;
	tmp_tex.d = 0;
	cvec_push_glBuffer(&context->buffers, tmp_buf);
	cvec_push_glTexture(&context->textures, tmp_tex);

	return 1;
}

void free_glContext(glContext* context)
{
	int i;

	free(context->zbuf.buf);
	free(context->stencil_buf.buf);
	if (!context->user_alloced_backbuf) {
		free(context->back_buffer.buf);
	}


	for (i=0; i<context->buffers.size; ++i) {
		if (!context->buffers.a[i].user_owned) {
			printf("freeing buffer %d\n", i);
			free(context->buffers.a[i].data);
		}
	}

	for (i=0; i<context->textures.size; ++i) {
		if (!context->textures.a[i].user_owned) {
			printf("freeing texture %d\n", i);
			free(context->textures.a[i].data);
		}
	}

	//free vectors
	cvec_free_glVertex_Array(&context->vertex_arrays);
	cvec_free_glBuffer(&context->buffers);
	cvec_free_glProgram(&context->programs);
	cvec_free_glTexture(&context->textures);
	cvec_free_glVertex(&context->glverts);

	cvec_free_float(&context->vs_output.output_buf);
}

void set_glContext(glContext* context)
{
	c = context;
}

void* pglResizeFramebuffer(size_t w, size_t h)
{
	u8* tmp;
	tmp = (u8*) realloc(c->zbuf.buf, w*h * sizeof(float));
	if (!tmp) {
		if (c->error == GL_NO_ERROR)
			c->error = GL_OUT_OF_MEMORY;
		return NULL;
	}
	c->zbuf.buf = tmp;
	c->zbuf.w = w;
	c->zbuf.h = h;
	c->zbuf.lastrow = c->zbuf.buf + (h-1)*w*sizeof(float);

	tmp = (u8*) realloc(c->back_buffer.buf, w*h * sizeof(u32));
	if (!tmp) {
		if (c->error == GL_NO_ERROR)
			c->error = GL_OUT_OF_MEMORY;
		return NULL;
	}
	c->back_buffer.buf = tmp;
	c->back_buffer.w = w;
	c->back_buffer.h = h;
	c->back_buffer.lastrow = c->back_buffer.buf + (h-1)*w*sizeof(u32);

	return tmp;
}



GLubyte* glGetString(GLenum name)
{
	static GLubyte vendor[] = "Robert Winkler";
	static GLubyte renderer[] = "PortableGL";
	static GLubyte version[] = "OpenGL 3.x-ish PortableGL 0.94";
	static GLubyte shading_language[] = "C/C++";

	switch (name) {
	case GL_VENDOR:                   return vendor;
	case GL_RENDERER:                 return renderer;
	case GL_VERSION:                  return version;
	case GL_SHADING_LANGUAGE_VERSION: return shading_language;
	default:
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return 0;
	}
}

GLenum glGetError()
{
	GLenum err = c->error;
	c->error = GL_NO_ERROR;
	return err;
}

void glGenVertexArrays(GLsizei n, GLuint* arrays)
{
	glVertex_Array tmp;
	init_glVertex_Array(&tmp);

	tmp.deleted = GL_FALSE;

	//fill up empty slots first
	--n;
	for (int i=1; i<c->vertex_arrays.size && n>=0; ++i) {
		if (c->vertex_arrays.a[i].deleted) {
			c->vertex_arrays.a[i] = tmp;
			arrays[n--] = i;
		}
	}

	for (; n>=0; --n) {
		cvec_push_glVertex_Array(&c->vertex_arrays, tmp);
		arrays[n] = c->vertex_arrays.size-1;
	}
}

void glDeleteVertexArrays(GLsizei n, const GLuint* arrays)
{
	for (int i=0; i<n; ++i) {
		if (!arrays[i] || arrays[i] >= c->vertex_arrays.size)
			continue;

		if (arrays[i] == c->cur_vertex_array) {
			//TODO check if memcpy isn't enough
			memcpy(&c->vertex_arrays.a[0], &c->vertex_arrays.a[arrays[i]], sizeof(glVertex_Array));
			c->cur_vertex_array = 0;
		}

		c->vertex_arrays.a[arrays[i]].deleted = GL_TRUE;
	}
}

void glGenBuffers(GLsizei n, GLuint* buffers)
{
	glBuffer tmp;
	tmp.user_owned = GL_TRUE;  // NOTE: Doesn't really matter at this point
	tmp.data = NULL;
	tmp.deleted = GL_FALSE;

	//fill up empty slots first
	--n;
	for (int i=1; i<c->buffers.size && n>=0; ++i) {
		if (c->buffers.a[i].deleted) {
			c->buffers.a[i] = tmp;
			buffers[n--] = i;
		}
	}

	for (; n>=0; --n) {
		cvec_push_glBuffer(&c->buffers, tmp);
		buffers[n] = c->buffers.size-1;
	}
}

void glDeleteBuffers(GLsizei n, const GLuint* buffers)
{
	GLenum type;
	for (int i=0; i<n; ++i) {
		if (!buffers[i] || buffers[i] >= c->buffers.size)
			continue;

		// NOTE(rswinkle): type is stored as correct index not the raw enum value so no need to
		// subtract here see glBindBuffer
		type = c->buffers.a[buffers[i]].type;
		if (buffers[i] == c->bound_buffers[type])
			c->bound_buffers[type] = 0;

		if (!c->buffers.a[buffers[i]].user_owned) {
			free(c->buffers.a[buffers[i]].data);
			c->buffers.a[buffers[i]].data = NULL;
		}

		c->buffers.a[buffers[i]].deleted = GL_TRUE;
	}
}

void glGenTextures(GLsizei n, GLuint* textures)
{
	glTexture tmp;
	//SET_VEC4(tmp.border_color, 0, 0, 0, 0);
	tmp.mag_filter = GL_LINEAR;
	tmp.min_filter = GL_LINEAR; //NOTE: spec says should be mipmap_linear
	tmp.wrap_s = GL_REPEAT;
	tmp.wrap_t = GL_REPEAT;
	tmp.data = NULL;
	tmp.deleted = GL_FALSE;
	tmp.user_owned = GL_TRUE;  // NOTE: could be either before data
	tmp.format = GL_RGBA;
	tmp.type = GL_TEXTURE_UNBOUND;
	tmp.w = 0;
	tmp.h = 0;
	tmp.d = 0;

	--n;
	for (int i=0; i<c->textures.size && n>=0; ++i) {
		if (c->textures.a[i].deleted) {
			c->textures.a[i] = tmp;
			textures[n--] = i;
		}
	}
	for (; n>=0; --n) {
		cvec_push_glTexture(&c->textures, tmp);
		textures[n] = c->textures.size-1;
	}
}

void glDeleteTextures(GLsizei n, GLuint* textures)
{
	GLenum type;
	for (int i=0; i<n; ++i) {
		if (!textures[i] || textures[i] >= c->textures.size)
			continue;

		// NOTE(rswinkle): type is stored as correct index not the raw enum value so no need to
		// subtract here see glBindTexture
		type = c->textures.a[textures[i]].type;
		if (textures[i] == c->bound_textures[type])
			c->bound_textures[type] = 0;

		if (!c->textures.a[textures[i]].user_owned) {
			free(c->textures.a[textures[i]].data);
			c->textures.a[textures[i]].data = NULL;
		}

		c->textures.a[textures[i]].deleted = GL_TRUE;
	}
}

void glBindVertexArray(GLuint array)
{
	if (array < c->vertex_arrays.size && c->vertex_arrays.a[array].deleted == GL_FALSE) {
		c->cur_vertex_array = array;
	} else if (!c->error) {
		c->error = GL_INVALID_OPERATION;
	}
}

void glBindBuffer(GLenum target, GLuint buffer)
{
//GL_ARRAY_BUFFER, GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER, GL_ELEMENT_ARRAY_BUFFER,
//GL_PIXEL_PACK_BUFFER, GL_PIXEL_UNPACK_BUFFER, GL_TEXTURE_BUFFER, GL_TRANSFORM_FEEDBACK_BUFFER, or GL_UNIFORM_BUFFER.
	if (target != GL_ARRAY_BUFFER && target != GL_ELEMENT_ARRAY_BUFFER) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	target -= GL_ARRAY_BUFFER;
	if (buffer < c->buffers.size && c->buffers.a[buffer].deleted == GL_FALSE) {
		c->bound_buffers[target] = buffer;

		// Note type isn't set till binding and we're not storing the raw
		// enum but the enum - GL_ARRAY_BUFFER so it's an index into c->bound_buffers
		// TODO need to see what's supposed to happen if you try to bind
		// a buffer to multiple targets
		c->buffers.a[buffer].type = target;
	} else if (!c->error) {
		c->error = GL_INVALID_OPERATION;
	}
}

void glBufferData(GLenum target, GLsizei size, const GLvoid* data, GLenum usage)
{
	if (target != GL_ARRAY_BUFFER && target != GL_ELEMENT_ARRAY_BUFFER) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	//check for usage later

	target -= GL_ARRAY_BUFFER;
	if (c->bound_buffers[target] == 0) {
		if (!c->error)
			c->error = GL_INVALID_OPERATION;
		return;
	}

	//always NULL or valid
	free(c->buffers.a[c->bound_buffers[target]].data);

	if (!(c->buffers.a[c->bound_buffers[target]].data = (u8*) malloc(size))) {
		if (!c->error)
			c->error = GL_OUT_OF_MEMORY;
		// GL state is undefined from here on
		return;
	}

	if (data) {
		memcpy(c->buffers.a[c->bound_buffers[target]].data, data, size);
	}

	c->buffers.a[c->bound_buffers[target]].user_owned = GL_FALSE;
	c->buffers.a[c->bound_buffers[target]].size = size;

	if (target == GL_ELEMENT_ARRAY_BUFFER - GL_ARRAY_BUFFER) {
		c->vertex_arrays.a[c->cur_vertex_array].element_buffer = c->bound_buffers[target];
	}
}

void glBufferSubData(GLenum target, GLsizei offset, GLsizei size, const GLvoid* data)
{
	if (target != GL_ARRAY_BUFFER && target != GL_ELEMENT_ARRAY_BUFFER) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	target -= GL_ARRAY_BUFFER;
	if (c->bound_buffers[target] == 0) {
		if (!c->error)
			c->error = GL_INVALID_OPERATION;
		return;
	}

	if (offset + size > c->buffers.a[c->bound_buffers[target]].size) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	memcpy(&c->buffers.a[c->bound_buffers[target]].data[offset], data, size);
}

void glBindTexture(GLenum target, GLuint texture)
{
	if (target < GL_TEXTURE_1D || target >= GL_NUM_TEXTURE_TYPES) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	target -= GL_TEXTURE_UNBOUND + 1;

	if (texture < c->textures.size && !c->textures.a[texture].deleted) {
		if (c->textures.a[texture].type == GL_TEXTURE_UNBOUND) {
			c->bound_textures[target] = texture;
			c->textures.a[texture].type = target;
		} else if (c->textures.a[texture].type == target) {
			c->bound_textures[target] = texture;
		} else if (!c->error) {
			c->error = GL_INVALID_OPERATION;
		}
	} else if (!c->error) {
		c->error = GL_INVALID_VALUE;
	}
}

void glTexParameteri(GLenum target, GLenum pname, GLint param)
{
	//GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, GL_TEXTURE_1D_ARRAY, GL_TEXTURE_2D_ARRAY, GL_TEXTURE_RECTANGLE, or GL_TEXTURE_CUBE_MAP.
	//will add others as they're implemented
	if (target != GL_TEXTURE_1D && target != GL_TEXTURE_2D && target != GL_TEXTURE_3D && target != GL_TEXTURE_2D_ARRAY && target != GL_TEXTURE_RECTANGLE && target != GL_TEXTURE_CUBE_MAP) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}
	
	//shift to range 0 - NUM_TEXTURES-1 to access bound_textures array
	target -= GL_TEXTURE_UNBOUND + 1;


//GL_TEXTURE_BASE_LEVEL, GL_TEXTURE_COMPARE_FUNC, GL_TEXTURE_COMPARE_MODE, GL_TEXTURE_LOD_BIAS, GL_TEXTURE_MIN_FILTER,
//GL_TEXTURE_MAG_FILTER, GL_TEXTURE_MIN_LOD, GL_TEXTURE_MAX_LOD, GL_TEXTURE_MAX_LEVEL, GL_TEXTURE_SWIZZLE_R,
//GL_TEXTURE_SWIZZLE_G, GL_TEXTURE_SWIZZLE_B, GL_TEXTURE_SWIZZLE_A, GL_TEXTURE_WRAP_S, GL_TEXTURE_WRAP_T, or GL_TEXTURE_WRAP_R.
	if (pname != GL_TEXTURE_MIN_FILTER && pname != GL_TEXTURE_MAG_FILTER &&
	    pname != GL_TEXTURE_WRAP_S && pname != GL_TEXTURE_WRAP_T && pname != GL_TEXTURE_WRAP_R) {

		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (pname == GL_TEXTURE_MIN_FILTER) {
		if(param != GL_NEAREST && param != GL_LINEAR && param != GL_NEAREST_MIPMAP_NEAREST &&
		   param != GL_NEAREST_MIPMAP_LINEAR && param != GL_LINEAR_MIPMAP_NEAREST &&
		   param != GL_LINEAR_MIPMAP_LINEAR) {
			if (!c->error)
				c->error = GL_INVALID_ENUM;
			return;
		}

		//TODO mipmapping isn't actually supported, not sure it's worth trouble/perf hit
		//just adding the enums to make porting easier
		if (param == GL_NEAREST_MIPMAP_NEAREST || param == GL_NEAREST_MIPMAP_LINEAR)
			param = GL_NEAREST;
		if (param == GL_LINEAR_MIPMAP_NEAREST || param == GL_LINEAR_MIPMAP_LINEAR)
			param = GL_LINEAR;

		c->textures.a[c->bound_textures[target]].min_filter = param;

	} else if (pname == GL_TEXTURE_MAG_FILTER) {
		if(param != GL_NEAREST && param != GL_LINEAR) {
			if (!c->error)
				c->error = GL_INVALID_ENUM;
			return;
		}
		c->textures.a[c->bound_textures[target]].mag_filter = param;
	} else if (pname == GL_TEXTURE_WRAP_S) {
		if(param != GL_REPEAT && param != GL_CLAMP_TO_EDGE && param != GL_CLAMP_TO_BORDER && param != GL_MIRRORED_REPEAT) {
			if (!c->error)
				c->error = GL_INVALID_ENUM;
			return;
		}
		c->textures.a[c->bound_textures[target]].wrap_s = param;
	} else if (pname == GL_TEXTURE_WRAP_T) {
		if(param != GL_REPEAT && param != GL_CLAMP_TO_EDGE && param != GL_CLAMP_TO_BORDER && param != GL_MIRRORED_REPEAT) {
			if (!c->error)
				c->error = GL_INVALID_ENUM;
			return;
		}
		c->textures.a[c->bound_textures[target]].wrap_t = param;
	} else if (pname == GL_TEXTURE_WRAP_R) {
		if(param != GL_REPEAT && param != GL_CLAMP_TO_EDGE && param != GL_CLAMP_TO_BORDER && param != GL_MIRRORED_REPEAT) {
			if (!c->error)
				c->error = GL_INVALID_ENUM;
			return;
		}
		c->textures.a[c->bound_textures[target]].wrap_r = param;
	}
}

void glPixelStorei(GLenum pname, GLint param)
{
	if (pname != GL_UNPACK_ALIGNMENT && pname != GL_PACK_ALIGNMENT) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (param != 1 && param != 2 && param != 4 && param != 8) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}
	
	if (pname == GL_UNPACK_ALIGNMENT) {
		c->unpack_alignment = param;
	} else if (pname == GL_PACK_ALIGNMENT) {
		c->pack_alignment = param;
	}

}

void glGenerateMipmap(GLenum target)
{
	if (target != GL_TEXTURE_1D && target != GL_TEXTURE_2D && target != GL_TEXTURE_3D && target != GL_TEXTURE_CUBE_MAP) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	//TODO not implemented, not sure it's worth it.  This stub is just to
	//make porting real OpenGL programs easier.
	//For example mipmap generation code see
	//https://github.com/thebeast33/cro_lib/blob/master/cro_mipmap.h
}



void glTexImage1D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLint border, GLenum format, GLenum type, const GLvoid* data)
{
	if (target != GL_TEXTURE_1D) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (border) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	//ignore level for now

	int cur_tex = c->bound_textures[target-GL_TEXTURE_UNBOUND-1];

	c->textures.a[cur_tex].w = width;

	if (type != GL_UNSIGNED_BYTE) {

		return;
	}

	int components;
	if (format == GL_RED) components = 1;
	else if (format == GL_RG) components = 2;
	else if (format == GL_RGB || format == GL_BGR) components = 3;
	else if (format == GL_RGBA || format == GL_BGRA) components = 4;
	else {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	// NULL or valid
	free(c->textures.a[cur_tex].data);

	//TODO support other internal formats? components should be of internalformat not format
	if (!(c->textures.a[cur_tex].data = (u8*) malloc(width * components))) {
		if (!c->error)
			c->error = GL_OUT_OF_MEMORY;
		//undefined state now
		return;
	}

	u32* texdata = (u32*) c->textures.a[cur_tex].data;

	if (data)
		memcpy(&texdata[0], data, width*sizeof(u32));

	c->textures.a[cur_tex].user_owned = GL_FALSE;

	//TODO
	//assume for now always RGBA coming in and that's what I'm storing it as
}

void glTexImage2D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid* data)
{
	//GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, GL_TEXTURE_1D_ARRAY, GL_TEXTURE_2D_ARRAY, GL_TEXTURE_RECTANGLE, or GL_TEXTURE_CUBE_MAP.
	//will add others as they're implemented
	if (target != GL_TEXTURE_2D &&
	    target != GL_TEXTURE_RECTANGLE &&
	    target != GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
	    target != GL_TEXTURE_CUBE_MAP_NEGATIVE_X &&
	    target != GL_TEXTURE_CUBE_MAP_POSITIVE_Y &&
	    target != GL_TEXTURE_CUBE_MAP_NEGATIVE_Y &&
	    target != GL_TEXTURE_CUBE_MAP_POSITIVE_Z &&
	    target != GL_TEXTURE_CUBE_MAP_NEGATIVE_Z) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (border) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	//ignore level for now

	//TODO support other types?
	if (type != GL_UNSIGNED_BYTE) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	// TODO I don't actually support anything other than GL_RGBA for input or
	// internal format ... so I should probably make the others errors and
	// I'm not even checking internalFormat currently..
	int components;
	if (format == GL_RED) components = 1;
	else if (format == GL_RG) components = 2;
	else if (format == GL_RGB || format == GL_BGR) components = 3;
	else if (format == GL_RGBA || format == GL_BGRA) components = 4;
	else {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	int cur_tex;

	// TODO If I ever support type other than GL_UNSIGNED_BYTE (also using for both internalformat and format)
	int byte_width = width * components;
	int padding_needed = byte_width % c->unpack_alignment;
	int padded_row_len = (!padding_needed) ? byte_width : byte_width + c->unpack_alignment - padding_needed;

	if (target == GL_TEXTURE_2D || target == GL_TEXTURE_RECTANGLE) {
		cur_tex = c->bound_textures[target-GL_TEXTURE_UNBOUND-1];

		c->textures.a[cur_tex].w = width;
		c->textures.a[cur_tex].h = height;

		// either NULL or valid
		free(c->textures.a[cur_tex].data);

		//TODO support other internal formats? components should be of internalformat not format
		if (!(c->textures.a[cur_tex].data = (u8*) malloc(height * byte_width))) {
			if (!c->error)
				c->error = GL_OUT_OF_MEMORY;
			//undefined state now
			return;
		}

		if (data) {
			if (!padding_needed) {
				memcpy(c->textures.a[cur_tex].data, data, height*byte_width);
			} else {
				for (int i=0; i<height; ++i) {
					memcpy(&c->textures.a[cur_tex].data[i*byte_width], &((u8*)data)[i*padded_row_len], byte_width);
				}
			}
		}

		c->textures.a[cur_tex].user_owned = GL_FALSE;

	} else {  //CUBE_MAP
		cur_tex = c->bound_textures[GL_TEXTURE_CUBE_MAP-GL_TEXTURE_UNBOUND-1];

		// If we're reusing a texture, and we haven't already loaded
		// one of the planes of the cubemap, data is either NULL or valid
		if (!c->textures.a[cur_tex].w)
			free(c->textures.a[cur_tex].data);

		if (width != height) {
			//TODO spec says INVALID_VALUE, man pages say INVALID_ENUM ?
			if (!c->error)
				c->error = GL_INVALID_VALUE;
			return;
		}

		int mem_size = width*height*6 * components;
		if (c->textures.a[cur_tex].w == 0) {
			c->textures.a[cur_tex].w = width;
			c->textures.a[cur_tex].h = width; //same cause square

			if (!(c->textures.a[cur_tex].data = (u8*) malloc(mem_size))) {
				if (!c->error)
					c->error = GL_OUT_OF_MEMORY;
				//undefined state now
				return;
			}
		} else if (c->textures.a[cur_tex].w != width) {
			//TODO spec doesn't say all sides must have same dimensions but it makes sense
			//and this site suggests it http://www.opengl.org/wiki/Cubemap_Texture
			if (!c->error)
				c->error = GL_INVALID_VALUE;
			return;
		}

		target -= GL_TEXTURE_CUBE_MAP_POSITIVE_X; //use target as plane index

		// TODO handle different format and internalFormat
		int p = height*byte_width;
		u8* texdata = c->textures.a[cur_tex].data;

		if (data) {
			if (!padding_needed) {
				memcpy(&texdata[target*p], data, height*byte_width);
			} else {
				for (int i=0; i<height; ++i) {
					memcpy(&texdata[target*p + i*byte_width], &((u8*)data)[i*padded_row_len], byte_width);
				}
			}
		}

		c->textures.a[cur_tex].user_owned = GL_FALSE;

	} //end CUBE_MAP
}

void glTexImage3D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, const GLvoid* data)
{
	if (target != GL_TEXTURE_3D && target != GL_TEXTURE_2D_ARRAY) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (border) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	//ignore level for now

	int cur_tex = c->bound_textures[target-GL_TEXTURE_UNBOUND-1];

	c->textures.a[cur_tex].w = width;
	c->textures.a[cur_tex].h = height;
	c->textures.a[cur_tex].d = depth;

	if (type != GL_UNSIGNED_BYTE) {
		// TODO
		return;
	}

	// TODO add error?  only support GL_RGBA for now
	int components;
	if (format == GL_RED) components = 1;
	else if (format == GL_RG) components = 2;
	else if (format == GL_RGB || format == GL_BGR) components = 3;
	else if (format == GL_RGBA || format == GL_BGRA) components = 4;
	else {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	int byte_width = width * components;
	int padding_needed = byte_width % c->unpack_alignment;
	int padded_row_len = (!padding_needed) ? byte_width : byte_width + c->unpack_alignment - padding_needed;

	// NULL or valid
	free(c->textures.a[cur_tex].data);

	//TODO support other internal formats? components should be of internalformat not format
	if (!(c->textures.a[cur_tex].data = (u8*) malloc(width*height*depth * components))) {
		if (!c->error)
			c->error = GL_OUT_OF_MEMORY;
		//undefined state now
		return;
	}

	u32* texdata = (u32*) c->textures.a[cur_tex].data;

	if (data) {
		if (!padding_needed) {
			memcpy(texdata, data, width*height*depth*sizeof(u32));
		} else {
			for (int i=0; i<height*depth; ++i) {
				memcpy(&texdata[i*byte_width], &((u8*)data)[i*padded_row_len], byte_width);
			}
		}
	}

	c->textures.a[cur_tex].user_owned = GL_FALSE;

	//TODO
	//assume for now always RGBA coming in and that's what I'm storing it as
}

void glTexSubImage1D(GLenum target, GLint level, GLint xoffset, GLsizei width, GLenum format, GLenum type, const GLvoid* data)
{
	if (target != GL_TEXTURE_1D) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	//ignore level for now

	int cur_tex = c->bound_textures[target-GL_TEXTURE_UNBOUND-1];

	//only kind supported currently
	if (type != GL_UNSIGNED_BYTE) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	//TODO
	if (format != GL_RGBA) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (xoffset < 0 || xoffset + width > c->textures.a[cur_tex].w) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	u32* texdata = (u32*) c->textures.a[cur_tex].data;
	memcpy(&texdata[xoffset], data, width*sizeof(u32));
}

void glTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid* data)
{
	//GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, GL_TEXTURE_1D_ARRAY, GL_TEXTURE_2D_ARRAY, GL_TEXTURE_RECTANGLE, or GL_TEXTURE_CUBE_MAP.
	//will add others as they're implemented
	if (target != GL_TEXTURE_2D &&
	    target != GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
	    target != GL_TEXTURE_CUBE_MAP_NEGATIVE_X &&
	    target != GL_TEXTURE_CUBE_MAP_POSITIVE_Y &&
	    target != GL_TEXTURE_CUBE_MAP_NEGATIVE_Y &&
	    target != GL_TEXTURE_CUBE_MAP_POSITIVE_Z &&
	    target != GL_TEXTURE_CUBE_MAP_NEGATIVE_Z) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	//ignore level for now

	if (type != GL_UNSIGNED_BYTE) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (format != GL_RGBA) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	int cur_tex;
	u32* d = (u32*) data;

	if (target == GL_TEXTURE_2D) {
		cur_tex = c->bound_textures[target-GL_TEXTURE_UNBOUND-1];
		u32* texdata = (u32*) c->textures.a[cur_tex].data;

		if (xoffset < 0 || xoffset + width > c->textures.a[cur_tex].w || yoffset < 0 || yoffset + height > c->textures.a[cur_tex].h) {
			if (!c->error)
				c->error = GL_INVALID_VALUE;
			return;
		}

		int w = c->textures.a[cur_tex].w;

		for (int i=0; i<height; ++i) {
			memcpy(&texdata[(yoffset+i)*w + xoffset], &d[i*width], width*sizeof(u32));
		}

	} else {  //CUBE_MAP
		cur_tex = c->bound_textures[GL_TEXTURE_CUBE_MAP-GL_TEXTURE_UNBOUND-1];
		u32* texdata = (u32*) c->textures.a[cur_tex].data;

		int w = c->textures.a[cur_tex].w;

		target -= GL_TEXTURE_CUBE_MAP_POSITIVE_X; //use target as plane index

		int p = w*w;

		for (int i=0; i<height; ++i)
			memcpy(&texdata[p*target + (yoffset+i)*w + xoffset], &d[i*width], width*sizeof(u32));
	} //end CUBE_MAP
}

void glTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const GLvoid* data)
{
	if (target != GL_TEXTURE_3D && target != GL_TEXTURE_2D_ARRAY) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	//ignore level for now
	
	// TODO handle UNPACK alignment here as well...

	int cur_tex = c->bound_textures[target-GL_TEXTURE_UNBOUND-1];

	if (type != GL_UNSIGNED_BYTE) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	//TODO
	if (format != GL_RGBA) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (xoffset < 0 || xoffset + width > c->textures.a[cur_tex].w ||
	    yoffset < 0 || yoffset + height > c->textures.a[cur_tex].h ||
	    zoffset < 0 || zoffset + depth > c->textures.a[cur_tex].d) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	int w = c->textures.a[cur_tex].w;
	int h = c->textures.a[cur_tex].h;
	int p = w*h;
	u32* d = (u32*) data;
	u32* texdata = (u32*) c->textures.a[cur_tex].data;

	for (int j=0; j<depth; ++j) {
		for (int i=0; i<height; ++i) {
			memcpy(&texdata[(zoffset+j)*p + (yoffset+i)*w + xoffset], &d[j*width*height + i*width], width*sizeof(u32));
		}
	}
}

void glVertexAttribPointer(GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, GLsizei offset)
{
	if (index >= GL_MAX_VERTEX_ATTRIBS || size < 1 || size > 4 || (!c->bound_buffers[GL_ARRAY_BUFFER-GL_ARRAY_BUFFER] && offset)) {
		if (!c->error)
			c->error = GL_INVALID_OPERATION;
		return;
	}

	//TODO type Specifies the data type of each component in the array. The symbolic constants GL_BYTE, GL_UNSIGNED_BYTE, GL_SHORT,
	//GL_UNSIGNED_SHORT, GL_INT, and GL_UNSIGNED_INT are accepted by both functions. Additionally GL_HALF_FLOAT, GL_FLOAT, GL_DOUBLE,
	//GL_INT_2_10_10_10_REV, and GL_UNSIGNED_INT_2_10_10_10_REV are accepted by glVertexAttribPointer. The initial value is GL_FLOAT.
	if (type != GL_FLOAT) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	glVertex_Attrib* v = &(c->vertex_arrays.a[c->cur_vertex_array].vertex_attribs[index]);
	v->size = size;
	v->type = type;

	//TODO expand for other types etc.
	v->stride = (stride) ? stride : size*sizeof(GLfloat);

	v->offset = offset;
	v->normalized = normalized;
	// I put ARRAY_BUFFER-itself instead of 0 to reinforce that bound_buffers is indexed that way, buffer type - GL_ARRAY_BUFFER
	v->buf = c->bound_buffers[GL_ARRAY_BUFFER-GL_ARRAY_BUFFER]; //can be 0 if offset is 0/NULL
}

void glEnableVertexAttribArray(GLuint index)
{
	c->vertex_arrays.a[c->cur_vertex_array].vertex_attribs[index].enabled = GL_TRUE;
}

void glDisableVertexAttribArray(GLuint index)
{
	c->vertex_arrays.a[c->cur_vertex_array].vertex_attribs[index].enabled = GL_FALSE;
}

void glVertexAttribDivisor(GLuint index, GLuint divisor)
{
	if (index >= GL_MAX_VERTEX_ATTRIBS) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	c->vertex_arrays.a[c->cur_vertex_array].vertex_attribs[index].divisor = divisor;
}


//TODO not used
vec4 get_vertex_attrib_array(glVertex_Attrib* v, GLsizei i)
{
	//this line need work for future flexibility and handling more than floats
	u8* buf_pos = (u8*)c->buffers.a[v->buf].data + v->offset + v->stride*i;

	vec4 tmpvec4;
	memcpy(&tmpvec4, buf_pos, sizeof(float)*v->size);

	//c->cur_vertex_array->vertex_attribs[enabled[j]].buf->data;
	return tmpvec4;
}


void glDrawArrays(GLenum mode, GLint first, GLsizei count)
{
	if (mode < GL_POINTS || mode > GL_TRIANGLE_FAN) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	// TODO should I just make GLsizei an uint32_t rather than int32_t?
	if (count < 0) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}
	if (!count)
		return;

	run_pipeline(mode, first, count, 0, 0, GL_FALSE);
}

void glDrawElements(GLenum mode, GLsizei count, GLenum type, GLsizei offset)
{
	if (mode < GL_POINTS || mode > GL_TRIANGLE_FAN) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	//error not in the spec but says type must be one of these ... strange
	if (type != GL_UNSIGNED_BYTE && type != GL_UNSIGNED_SHORT && type != GL_UNSIGNED_INT) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}
	// TODO should I just make GLsizei an uint32_t rather than int32_t?
	if (count < 0) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}
	if (!count)
		return;

	c->buffers.a[c->vertex_arrays.a[c->cur_vertex_array].element_buffer].type = type;
	run_pipeline(mode, offset, count, 0, 0, GL_TRUE);
}

void glDrawArraysInstanced(GLenum mode, GLint first, GLsizei count, GLsizei instancecount)
{
	if (mode < GL_POINTS || mode > GL_TRIANGLE_FAN) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (count < 0 || instancecount < 0) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}
	if (!count || !instancecount)
		return;

	for (unsigned int instance = 0; instance < instancecount; ++instance) {
		run_pipeline(mode, first, count, instance, 0, GL_FALSE);
	}
}

void glDrawArraysInstancedBaseInstance(GLenum mode, GLint first, GLsizei count, GLsizei instancecount, GLuint baseinstance)
{
	if (mode < GL_POINTS || mode > GL_TRIANGLE_FAN) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (count < 0 || instancecount < 0) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}
	if (!count || !instancecount)
		return;

	for (unsigned int instance = 0; instance < instancecount; ++instance) {
		run_pipeline(mode, first, count, instance, baseinstance, GL_FALSE);
	}
}


void glDrawElementsInstanced(GLenum mode, GLsizei count, GLenum type, GLsizei offset, GLsizei instancecount)
{
	if (mode < GL_POINTS || mode > GL_TRIANGLE_FAN) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	// NOTE: error not in the spec but says type must be one of these ... strange
	if (type != GL_UNSIGNED_BYTE && type != GL_UNSIGNED_SHORT && type != GL_UNSIGNED_INT) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}
	if (count < 0 || instancecount < 0) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}
	if (!count || !instancecount)
		return;

	c->buffers.a[c->vertex_arrays.a[c->cur_vertex_array].element_buffer].type = type;

	for (unsigned int instance = 0; instance < instancecount; ++instance) {
		run_pipeline(mode, offset, count, instance, 0, GL_TRUE);
	}
}

void glDrawElementsInstancedBaseInstance(GLenum mode, GLsizei count, GLenum type, GLsizei offset, GLsizei instancecount, GLuint baseinstance)
{
	if (mode < GL_POINTS || mode > GL_TRIANGLE_FAN) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	//error not in the spec but says type must be one of these ... strange
	if (type != GL_UNSIGNED_BYTE && type != GL_UNSIGNED_SHORT && type != GL_UNSIGNED_INT) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}
	if (count < 0 || instancecount < 0) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}
	if (!count || !instancecount)
		return;

	c->buffers.a[c->vertex_arrays.a[c->cur_vertex_array].element_buffer].type = type;

	for (unsigned int instance = 0; instance < instancecount; ++instance) {
		run_pipeline(mode, offset, count, instance, baseinstance, GL_TRUE);
	}
}


void glViewport(int x, int y, GLsizei width, GLsizei height)
{
	if (width < 0 || height < 0) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	make_viewport_matrix(c->vp_mat, x, y, width, height, 1);
	c->x_min = x;
	c->y_min = y;
	c->x_max = x + width;
	c->y_max = y + height;
}

void glClearColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha)
{
	red = clampf_01(red);
	green = clampf_01(green);
	blue = clampf_01(blue);
	alpha = clampf_01(alpha);

	vec4 tmp = { red, green, blue, alpha };
	c->clear_color = vec4_to_Color(tmp);
}

void glClearDepth(GLclampf depth)
{
	c->clear_depth = clampf_01(depth);
}

void glDepthFunc(GLenum func)
{
	if (func < GL_LESS || func > GL_NEVER) {
		if (!c->error)
			c->error =GL_INVALID_ENUM;

		return;
	}

	c->depth_func = func;
}

void glDepthRange(GLclampf nearVal, GLclampf farVal)
{
	c->depth_range_near = clampf_01(nearVal);
	c->depth_range_far = clampf_01(farVal);
}

void glDepthMask(GLboolean flag)
{
	c->depth_mask = flag;
}

void glClear(GLbitfield mask)
{
	if (!(mask & (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT))) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		printf("failed to clear\n");
		return;
	}
	
	// TODO since all the buffers should be the same width and height
	// (right? even though they're different types they should be 1 to 1),
	// why not just set local w and h and use for all instead of member w/h
	// for each framebuffer?

	// better to just set min/max x/y and use nested loops even when scissor is disabled?
	Color col = c->clear_color;
	if (mask & GL_COLOR_BUFFER_BIT) {
		if (!c->scissor_test) {
			for (int i=0; i<c->back_buffer.w*c->back_buffer.h; ++i) {
				((u32*)c->back_buffer.buf)[i] = col.a << c->Ashift | col.r << c->Rshift | col.g << c->Gshift | col.b << c->Bshift;
			}
		} else {
			for (int y=c->scissor_ly; y<c->scissor_uy; ++y) {
				for (int x=c->scissor_lx; x<c->scissor_ux; ++x) {
					((u32*)c->back_buffer.lastrow)[-y*c->back_buffer.w + x] = col.a << c->Ashift | col.r << c->Rshift | col.g << c->Gshift | col.b << c->Bshift;
				}
			}
		}
	}

	if (mask & GL_DEPTH_BUFFER_BIT) {
		if (!c->scissor_test) {
			//TODO try a big memcpy or other way to clear it
			for (int i=0; i < c->zbuf.w * c->zbuf.h; ++i) {
				((float*)c->zbuf.buf)[i] = c->clear_depth;
			}
		} else {
			for (int y=c->scissor_ly; y<c->scissor_uy; ++y) {
				for (int x=c->scissor_lx; x<c->scissor_ux; ++x) {
					((float*)c->zbuf.lastrow)[-y*c->zbuf.w + x] = c->clear_depth;
				}
			}
		}
	}

	if (mask & GL_STENCIL_BUFFER_BIT) {
		if (!c->scissor_test) {
			//TODO try a big memcpy or other way to clear it
			for (int i=0; i < c->stencil_buf.w * c->stencil_buf.h; ++i) {
				c->stencil_buf.buf[i] = c->clear_stencil;
			}
		} else {
			for (int y=c->scissor_ly; y<c->scissor_uy; ++y) {
				for (int x=c->scissor_lx; x<c->scissor_ux; ++x) {
					c->stencil_buf.lastrow[-y*c->stencil_buf.w + x] = c->clear_stencil;
				}
			}
		}
	}
}

void glEnable(GLenum cap)
{
	switch (cap) {
	case GL_CULL_FACE:
		c->cull_face = GL_TRUE;
		break;
	case GL_DEPTH_TEST:
		c->depth_test = GL_TRUE;
		break;
	case GL_DEPTH_CLAMP:
		c->depth_clamp = GL_TRUE;
		break;
	case GL_LINE_SMOOTH:
		// TODO implementation needs work/upgrade
		//c->line_smooth = GL_TRUE;
		break;
	case GL_BLEND:
		c->blend = GL_TRUE;
		break;
	case GL_COLOR_LOGIC_OP:
		c->logic_ops = GL_TRUE;
		break;
	case GL_POLYGON_OFFSET_FILL:
		c->poly_offset = GL_TRUE;
		break;
	case GL_SCISSOR_TEST:
		c->scissor_test = GL_TRUE;
		break;
	case GL_STENCIL_TEST:
		c->stencil_test = GL_TRUE;
		break;
	default:
		if (!c->error)
			c->error = GL_INVALID_ENUM;
	}
}

void glDisable(GLenum cap)
{
	switch (cap) {
	case GL_CULL_FACE:
		c->cull_face = GL_FALSE;
		break;
	case GL_DEPTH_TEST:
		c->depth_test = GL_FALSE;
		break;
	case GL_DEPTH_CLAMP:
		c->depth_clamp = GL_FALSE;
		break;
	case GL_LINE_SMOOTH:
		c->line_smooth = GL_FALSE;
		break;
	case GL_BLEND:
		c->blend = GL_FALSE;
		break;
	case GL_COLOR_LOGIC_OP:
		c->logic_ops = GL_FALSE;
		break;
	case GL_POLYGON_OFFSET_FILL:
		c->poly_offset = GL_FALSE;
		break;
	case GL_SCISSOR_TEST:
		c->scissor_test = GL_FALSE;
		break;
	case GL_STENCIL_TEST:
		c->stencil_test = GL_FALSE;
		break;
	default:
		if (!c->error)
			c->error = GL_INVALID_ENUM;
	}
}

GLboolean glIsEnabled(GLenum cap)
{
	// make up my own enum for this?  rename member as no_early_z?
	//GLboolean fragdepth_or_discard;
	switch (cap) {
	case GL_DEPTH_TEST: return c->depth_test;
	case GL_LINE_SMOOTH: return c->line_smooth;
	case GL_CULL_FACE: return c->cull_face;
	case GL_DEPTH_CLAMP: return c->depth_clamp;
	case GL_BLEND: return c->blend;
	case GL_COLOR_LOGIC_OP: return c->logic_ops;
	case GL_POLYGON_OFFSET_FILL: return c->poly_offset;
	case GL_SCISSOR_TEST: return c->scissor_test;
	case GL_STENCIL_TEST: return c->stencil_test;
	default:
		if (!c->error)
			c->error = GL_INVALID_ENUM;
	}

	return GL_FALSE;
}

void glGetBooleanv(GLenum pname, GLboolean* params)
{
	// not sure it's worth adding every enum, spec says
	// gelGet* will convert/map types if they don't match the function
	switch (pname) {
	case GL_DEPTH_TEST:          *params = c->depth_test;   break;
	case GL_LINE_SMOOTH:         *params = c->line_smooth;  break;
	case GL_CULL_FACE:           *params = c->cull_face;    break;
	case GL_DEPTH_CLAMP:         *params = c->depth_clamp;  break;
	case GL_BLEND:               *params = c->blend;        break;
	case GL_COLOR_LOGIC_OP:      *params = c->logic_ops;    break;
	case GL_POLYGON_OFFSET_FILL: *params = c->poly_offset;  break;
	case GL_SCISSOR_TEST:        *params = c->scissor_test; break;
	case GL_STENCIL_TEST:        *params = c->stencil_test; break;
	default:
		if (!c->error)
			c->error = GL_INVALID_ENUM;
	}
}

void glGetFloatv(GLenum pname, GLfloat* params)
{
	switch (pname) {
	case GL_POLYGON_OFFSET_FACTOR: *params = c->poly_factor; break;
	case GL_POLYGON_OFFSET_UNITS:  *params = c->poly_units;  break;
	case GL_POINT_SIZE:            *params = c->point_size;  break;
	case GL_DEPTH_CLEAR_VALUE:     *params = c->clear_depth; break;
	case GL_DEPTH_RANGE:
		params[0] = c->depth_range_near;
		params[1] = c->depth_range_near;
		break;
	default:
		if (!c->error)
			c->error = GL_INVALID_ENUM;
	}
}

void glGetIntegerv(GLenum pname, GLint* params)
{
	// TODO maybe make all the enum/int member names match the associated ENUM?
	switch (pname) {
	case GL_STENCIL_WRITE_MASK:       params[0] = c->stencil_writemask; break;
	case GL_STENCIL_REF:              params[0] = c->stencil_ref; break;
	case GL_STENCIL_VALUE_MASK:       params[0] = c->stencil_valuemask; break;
	case GL_STENCIL_FUNC:             params[0] = c->stencil_func; break;
	case GL_STENCIL_FAIL:             params[0] = c->stencil_sfail; break;
	case GL_STENCIL_PASS_DEPTH_FAIL:  params[0] = c->stencil_dpfail; break;
	case GL_STENCIL_PASS_DEPTH_PASS:  params[0] = c->stencil_dppass; break;

	case GL_STENCIL_BACK_WRITE_MASK:       params[0] = c->stencil_writemask_back; break;
	case GL_STENCIL_BACK_REF:              params[0] = c->stencil_ref_back; break;
	case GL_STENCIL_BACK_VALUE_MASK:       params[0] = c->stencil_valuemask_back; break;
	case GL_STENCIL_BACK_FUNC:             params[0] = c->stencil_func_back; break;
	case GL_STENCIL_BACK_FAIL:             params[0] = c->stencil_sfail_back; break;
	case GL_STENCIL_BACK_PASS_DEPTH_FAIL:  params[0] = c->stencil_dpfail_back; break;
	case GL_STENCIL_BACK_PASS_DEPTH_PASS:  params[0] = c->stencil_dppass_back; break;


	//TODO implement glBlendFuncSeparate and glBlendEquationSeparate
	case GL_LOGIC_OP_MODE:             params[0] = c->logic_func; break;
	case GL_BLEND_SRC_RGB:
	case GL_BLEND_SRC_ALPHA:           params[0] = c->blend_sfactor; break;
	case GL_BLEND_DST_RGB:
	case GL_BLEND_DST_ALPHA:           params[0] = c->blend_dfactor; break;

	case GL_BLEND_EQUATION_RGB:
	case GL_BLEND_EQUATION_ALPHA:      params[0] = c->blend_equation; break;

	case GL_CULL_FACE_MODE:            params[0] = c->cull_mode; break;
	case GL_FRONT_FACE:                params[0] = c->front_face; break;
	case GL_DEPTH_FUNC:                params[0] = c->depth_func; break;
	case GL_POINT_SPRITE_COORD_ORIGIN: params[0] = c->point_spr_origin;
	case GL_PROVOKING_VERTEX:          params[0] = c->provoking_vert; break;

	case GL_POLYGON_MODE:
		params[0] = c->poly_mode_front;
		params[1] = c->poly_mode_back;
		break;
	default:
		if (!c->error)
			c->error = GL_INVALID_ENUM;
	}
}

void glCullFace(GLenum mode)
{
	if (mode != GL_FRONT && mode != GL_BACK && mode != GL_FRONT_AND_BACK) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}
	c->cull_mode = mode;
}


void glFrontFace(GLenum mode)
{
	if (mode != GL_CCW && mode != GL_CW) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}
	c->front_face = mode;
}

void glPolygonMode(GLenum face, GLenum mode)
{
	if ((face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) ||
	    (mode != GL_POINT && mode != GL_LINE && mode != GL_FILL)) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (mode == GL_POINT) {
		if (face == GL_FRONT) {
			c->poly_mode_front = mode;
			c->draw_triangle_front = draw_triangle_point;
		} else if (face == GL_BACK) {
			c->poly_mode_back = mode;
			c->draw_triangle_back = draw_triangle_point;
		} else {
			c->poly_mode_front = mode;
			c->poly_mode_back = mode;
			c->draw_triangle_front = draw_triangle_point;
			c->draw_triangle_back = draw_triangle_point;
		}
	} else if (mode == GL_LINE) {
		if (face == GL_FRONT) {
			c->poly_mode_front = mode;
			c->draw_triangle_front = draw_triangle_line;
		} else if (face == GL_BACK) {
			c->poly_mode_back = mode;
			c->draw_triangle_back = draw_triangle_line;
		} else {
			c->poly_mode_front = mode;
			c->poly_mode_back = mode;
			c->draw_triangle_front = draw_triangle_line;
			c->draw_triangle_back = draw_triangle_line;
		}
	} else  {
		if (face == GL_FRONT) {
			c->poly_mode_front = mode;
			c->draw_triangle_front = draw_triangle_fill;
		} else if (face == GL_BACK) {
			c->poly_mode_back = mode;
			c->draw_triangle_back = draw_triangle_fill;
		} else {
			c->poly_mode_front = mode;
			c->poly_mode_back = mode;
			c->draw_triangle_front = draw_triangle_fill;
			c->draw_triangle_back = draw_triangle_fill;
		}
	}
}


void glPointSize(GLfloat size)
{
	if (size <= 0.0f) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}
	c->point_size = size;
}

void glPointParameteri(GLenum pname, GLint param)
{
	//also GL_POINT_FADE_THRESHOLD_SIZE
	if (pname != GL_POINT_SPRITE_COORD_ORIGIN || (param != GL_LOWER_LEFT && param != GL_UPPER_LEFT)) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}
	c->point_spr_origin = param;
}


void glProvokingVertex(GLenum provokeMode)
{
	if (provokeMode != GL_FIRST_VERTEX_CONVENTION && provokeMode != GL_LAST_VERTEX_CONVENTION) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	c->provoking_vert = provokeMode;
}


// Shader functions
GLuint pglCreateProgram(vert_func vertex_shader, frag_func fragment_shader, GLsizei n, GLenum* interpolation, GLboolean fragdepth_or_discard)
{
	if (!vertex_shader || !fragment_shader) {
		//TODO set error? doesn't in spec but I'll think about it
		return 0;
	}

	if (n > GL_MAX_VERTEX_OUTPUT_COMPONENTS) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return 0;
	}

	glProgram tmp = {vertex_shader, fragment_shader, NULL, n, {0}, fragdepth_or_discard, GL_FALSE };
	memcpy(tmp.interpolation, interpolation, n*sizeof(GLenum));

	for (int i=1; i<c->programs.size; ++i) {
		if (c->programs.a[i].deleted && i != c->cur_program) {
			c->programs.a[i] = tmp;
			return i;
		}
	}

	cvec_push_glProgram(&c->programs, tmp);
	return c->programs.size-1;
}

void glDeleteProgram(GLuint program)
{
	if (!program)
		return;

	if (program >= c->programs.size) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	c->programs.a[program].deleted = GL_TRUE;
}

void glUseProgram(GLuint program)
{
	if (program >= c->programs.size) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	c->vs_output.size = c->programs.a[program].vs_output_size;
	cvec_reserve_float(&c->vs_output.output_buf, c->vs_output.size * MAX_VERTICES);
	c->vs_output.interpolation = c->programs.a[program].interpolation;
	c->fragdepth_or_discard = c->programs.a[program].fragdepth_or_discard;

	c->cur_program = program;
}

void pglSetUniform(void* uniform)
{
	//TODO check for NULL? definitely if I ever switch to storing a local
	//copy in glProgram
	c->programs.a[c->cur_program].uniform = uniform;
}


void glBlendFunc(GLenum sfactor, GLenum dfactor)
{
	if (sfactor < GL_ZERO || sfactor >= NUM_BLEND_FUNCS || dfactor < GL_ZERO || dfactor >= NUM_BLEND_FUNCS) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;

		return;
	}

	c->blend_sfactor = sfactor;
	c->blend_dfactor = dfactor;
}

void glBlendEquation(GLenum mode)
{
	if (mode < GL_FUNC_ADD || mode >= NUM_BLEND_EQUATIONS ) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;

		return;
	}

	c->blend_equation = mode;
}

void glBlendColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha)
{
	SET_VEC4(c->blend_color, clampf_01(red), clampf_01(green), clampf_01(blue), clampf_01(alpha));
}

void glLogicOp(GLenum opcode)
{
	if (opcode < GL_CLEAR || opcode > GL_INVERT) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;

		return;
	}
	c->logic_func = opcode;
}

void glPolygonOffset(GLfloat factor, GLfloat units)
{
	c->poly_factor = factor;
	c->poly_units = units;
}

void glScissor(GLint x, GLint y, GLsizei width, GLsizei height)
{
	// once again why is GLsizei not unsigned?
	if (width < 0 || height < 0) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;

		return;
	}

	c->scissor_lx = x;
	c->scissor_ly = y;
	c->scissor_ux = x+width;
	c->scissor_uy = y+height;
}

void glStencilFunc(GLenum func, GLint ref, GLuint mask)
{
	if (func < GL_LESS || func > GL_NEVER) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;

		return;
	}

	c->stencil_func = func;
	c->stencil_func_back = func;

	// TODO clamp byte function?
	if (ref > 255)
		ref = 255;
	if (ref < 0)
		ref = 0;

	c->stencil_ref = ref;
	c->stencil_ref_back = ref;

	c->stencil_valuemask = mask;
	c->stencil_valuemask_back = mask;
}

void glStencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask)
{
	if (face < GL_FRONT || face > GL_FRONT_AND_BACK) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;

		return;
	}

	if (face == GL_FRONT_AND_BACK) {
		glStencilFunc(func, ref, mask);
		return;
	}

	if (func < GL_LESS || func > GL_NEVER) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;

		return;
	}

	// TODO clamp byte function?
	if (ref > 255)
		ref = 255;
	if (ref < 0)
		ref = 0;

	if (face == GL_FRONT) {
		c->stencil_func = func;
		c->stencil_ref = ref;
		c->stencil_valuemask = mask;
	} else {
		c->stencil_func_back = func;
		c->stencil_ref_back = ref;
		c->stencil_valuemask_back = mask;
	}
}

void glStencilOp(GLenum sfail, GLenum dpfail, GLenum dppass)
{
	// TODO not sure if I should check all parameters first or
	// allow partial success?
	//
	// Also, how best to check when the enums aren't contiguous?  empty switch?
	// manually checking all enums?
	if ((sfail < GL_INVERT || sfail > GL_DECR_WRAP) && sfail != GL_ZERO ||
	    (dpfail < GL_INVERT || dpfail > GL_DECR_WRAP) && sfail != GL_ZERO ||
	    (dppass < GL_INVERT || dppass > GL_DECR_WRAP) && sfail != GL_ZERO) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;

		return;
	}

	c->stencil_sfail = sfail;
	c->stencil_dpfail = dpfail;
	c->stencil_dppass = dppass;

	c->stencil_sfail_back = sfail;
	c->stencil_dpfail_back = dpfail;
	c->stencil_dppass_back = dppass;
}

void glStencilOpSeparate(GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass)
{
	if (face < GL_FRONT || face > GL_FRONT_AND_BACK) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;

		return;
	}

	if (face == GL_FRONT_AND_BACK) {
		glStencilOp(sfail, dpfail, dppass);
		return;
	}

	if ((sfail < GL_INVERT || sfail > GL_DECR_WRAP) && sfail != GL_ZERO ||
	    (dpfail < GL_INVERT || dpfail > GL_DECR_WRAP) && sfail != GL_ZERO ||
	    (dppass < GL_INVERT || dppass > GL_DECR_WRAP) && sfail != GL_ZERO) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;

		return;
	}

	if (face == GL_FRONT) {
		c->stencil_sfail = sfail;
		c->stencil_dpfail = dpfail;
		c->stencil_dppass = dppass;
	} else {
		c->stencil_sfail_back = sfail;
		c->stencil_dpfail_back = dpfail;
		c->stencil_dppass_back = dppass;
	}
}

void glClearStencil(GLint s)
{
	// stencil is 8 bit bytes so just hardcoding FF here
	c->clear_stencil = s & 0xFF;
}

void glStencilMask(GLuint mask)
{
	c->stencil_writemask = mask;
	c->stencil_writemask_back = mask;
}

void glStencilMaskSeparate(GLenum face, GLuint mask)
{
	if (face < GL_FRONT || face > GL_FRONT_AND_BACK) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;

		return;
	}

	if (face == GL_FRONT_AND_BACK) {
		glStencilMask(mask);
		return;
	}

	if (face == GL_FRONT) {
		c->stencil_writemask = mask;
	} else {
		c->stencil_writemask_back = mask;
	}
}


// Just wrap my pgl extension getter, unmap does nothing
void* glMapBuffer(GLenum target, GLenum access)
{
	if (target != GL_ARRAY_BUFFER && target != GL_ELEMENT_ARRAY_BUFFER) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return NULL;
	}

	if (access != GL_READ_ONLY && access != GL_WRITE_ONLY && access != GL_READ_WRITE) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return NULL;
	}

	// adjust to access bound_buffers
	target -= GL_ARRAY_BUFFER;

	void* data = NULL;
	pglGetBufferData(c->bound_buffers[target], &data);
	return data;
}

void* glMapNamedBuffer(GLuint buffer, GLenum access)
{
	// pglGetBufferData will verify buffer is valid
	if (access != GL_READ_ONLY && access != GL_WRITE_ONLY && access != GL_READ_WRITE) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return NULL;
	}

	void* data = NULL;
	pglGetBufferData(buffer, &data);
	return data;
}

// Stubs to let real OpenGL libs compile with minimal modifications/ifdefs
// add what you need

void glGetDoublev(GLenum pname, GLdouble* params) { }
void glGetInteger64v(GLenum pname, GLint64* params) { }


void glGetProgramiv(GLuint program, GLenum pname, GLint* params) { }
void glGetProgramInfoLog(GLuint program, GLsizei maxLength, GLsizei* length, GLchar* infoLog) { }
void glAttachShader(GLuint program, GLuint shader) { }
void glCompileShader(GLuint shader) { }
void glGetShaderInfoLog(GLuint shader, GLsizei maxLength, GLsizei* length, GLchar* infoLog) { }
void glLinkProgram(GLuint program) { }
void glShaderSource(GLuint shader, GLsizei count, const GLchar** string, const GLint* length) { }
void glGetShaderiv(GLuint shader, GLenum pname, GLint* params) { }
void glDeleteShader(GLuint shader) { }
void glDetachShader(GLuint program, GLuint shader) { }

GLuint glCreateProgram() { return 0; }
GLuint glCreateShader(GLenum shaderType) { return 0; }
GLint glGetUniformLocation(GLuint program, const GLchar* name) { return 0; }
GLint glGetAttribLocation(GLuint program, const GLchar* name) { return 0; }

GLboolean glUnmapBuffer(GLenum target) { return GL_TRUE; }
GLboolean glUnmapNamedBuffer(GLuint buffer) { return GL_TRUE; }

// TODO
void glLineWidth(GLfloat width) { }

void glActiveTexture(GLenum texture) { }
void glTexParameterfv(GLenum target, GLenum pname, const GLfloat* params) { }

void glUniform1f(GLint location, GLfloat v0) { }
void glUniform2f(GLint location, GLfloat v0, GLfloat v1) { }
void glUniform3f(GLint location, GLfloat v0, GLfloat v1, GLfloat v2) { }
void glUniform4f(GLint location, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3) { }

void glUniform1i(GLint location, GLint v0) { }
void glUniform2i(GLint location, GLint v0, GLint v1) { }
void glUniform3i(GLint location, GLint v0, GLint v1, GLint v2) { }
void glUniform4i(GLint location, GLint v0, GLint v1, GLint v2, GLint v3) { }

void glUniform1ui(GLuint location, GLuint v0) { }
void glUniform2ui(GLuint location, GLuint v0, GLuint v1) { }
void glUniform3ui(GLuint location, GLuint v0, GLuint v1, GLuint v2) { }
void glUniform4ui(GLuint location, GLuint v0, GLuint v1, GLuint v2, GLuint v3) { }

void glUniform1fv(GLint location, GLsizei count, const GLfloat* value) { }
void glUniform2fv(GLint location, GLsizei count, const GLfloat* value) { }
void glUniform3fv(GLint location, GLsizei count, const GLfloat* value) { }
void glUniform4fv(GLint location, GLsizei count, const GLfloat* value) { }

void glUniform1iv(GLint location, GLsizei count, const GLint* value) { }
void glUniform2iv(GLint location, GLsizei count, const GLint* value) { }
void glUniform3iv(GLint location, GLsizei count, const GLint* value) { }
void glUniform4iv(GLint location, GLsizei count, const GLint* value) { }

void glUniform1uiv(GLint location, GLsizei count, const GLuint* value) { }
void glUniform2uiv(GLint location, GLsizei count, const GLuint* value) { }
void glUniform3uiv(GLint location, GLsizei count, const GLuint* value) { }
void glUniform4uiv(GLint location, GLsizei count, const GLuint* value) { }

void glUniformMatrix2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value) { }
void glUniformMatrix3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value) { }
void glUniformMatrix4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value) { }
void glUniformMatrix2x3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value) { }
void glUniformMatrix3x2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value) { }
void glUniformMatrix2x4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value) { }
void glUniformMatrix4x2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value) { }
void glUniformMatrix3x4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value) { }
void glUniformMatrix4x3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat* value) { }




/*************************************
 *  GLSL(ish) functions
 *************************************/

float clampf_01(float f)
{
	if (f < 0.0f) return 0.0f;
	if (f > 1.0f) return 1.0f;
	return f;
}

float clampf(float f, float min, float max)
{
	if (f < min) return min;
	if (f > max) return max;
	return f;
}

int clampi(int i, int min, int max)
{
	if (i < min) return min;
	if (i > max) return max;
	return i;
}


#define imod(a, b) (a) - (b) * ((a)/(b))

static int wrap(int i, int size, GLenum mode)
{
	int tmp, tmp2;
	switch (mode)
	{
	case GL_REPEAT:
		tmp = imod(i, size);
		if (tmp < 0) tmp = size + tmp;
		return tmp;

	// Border is too much of a pain to implement with render to
	// texture.  Trade offs in poor performance or ugly extra code
	// for a feature that almost no one actually uses and even
	// when it is used (barring rare/odd uv coordinates) it's not
	// even noticable.
	//case GL_CLAMP_TO_BORDER:
		//return clampi(i, -1, size);

	case GL_CLAMP_TO_BORDER:  // just so stuff that uses it compiles
	case GL_CLAMP_TO_EDGE:
		return clampi(i, 0, size-1);
	

	case GL_MIRRORED_REPEAT:
		if (i < 0) i = -i;
		tmp = i / size;
		tmp2 = i / (2*size);  // TODO what was this for?
		if (tmp % 2)
			return (size-1) - (i - tmp * size);
		else
			return i - tmp * size;

		return tmp;
	default:
		//should never happen, get rid of compile warning
		assert(0);
		return 0;
	}
}
#undef imod


// used in the following 4 texture access functions
// Not sure if it's actually necessary since wrap() clamps
#define EPSILON 0.000001
vec4 texture1D(GLuint tex, float x)
{
	int i0, i1;

	glTexture* t = &c->textures.a[tex];
	Color* texdata = (Color*)t->data;

	double w = t->w - EPSILON;

	double xw = x * w;

	if (t->mag_filter == GL_NEAREST) {
		i0 = wrap(floor(xw), t->w, t->wrap_s);

		return Color_to_vec4(texdata[i0]);

	} else {
		// LINEAR
		// This seems right to me since pixel centers are 0.5 but
		// this isn't exactly what's described in the spec or FoCG
		i0 = wrap(floor(xw - 0.5), t->w, t->wrap_s);
		i1 = wrap(floor(xw + 0.499999), t->w, t->wrap_s);

		double tmp2;
		double alpha = modf(xw+0.5, &tmp2);
		if (alpha < 0) ++alpha;

		//hermite smoothing is optional
		//looks like my nvidia implementation doesn't do it
		//but it can look a little better
#ifdef HERMITE_SMOOTHING
		alpha = alpha*alpha * (3 - 2*alpha);
#endif

		vec4 ci = Color_to_vec4(texdata[i0]);
		vec4 ci1 = Color_to_vec4(texdata[i1]);

		ci = scale_vec4(ci, (1-alpha));
		ci1 = scale_vec4(ci1, alpha);

		ci = add_vec4s(ci, ci1);

		return ci;
	}
}

vec4 texture2D(GLuint tex, float x, float y)
{
	int i0, j0, i1, j1;

	glTexture* t = &c->textures.a[tex];
	Color* texdata = (Color*)t->data;

	int w = t->w;
	int h = t->h;

	double dw = w - EPSILON;
	double dh = h - EPSILON;

	double xw = x * dw;
	double yh = y * dh;

	//TODO don't just use mag_filter all the time?
	//is it worth bothering?
	if (t->mag_filter == GL_NEAREST) {
		i0 = wrap(floor(xw), w, t->wrap_s);
		j0 = wrap(floor(yh), h, t->wrap_t);

		return Color_to_vec4(texdata[j0*w + i0]);

	} else {
		// LINEAR
		// This seems right to me since pixel centers are 0.5 but
		// this isn't exactly what's described in the spec or FoCG
		i0 = wrap(floor(xw - 0.5), w, t->wrap_s);
		j0 = wrap(floor(yh - 0.5), h, t->wrap_t);
		i1 = wrap(floor(xw + 0.499999), w, t->wrap_s);
		j1 = wrap(floor(yh + 0.499999), h, t->wrap_t);

		double tmp2;
		double alpha = modf(xw+0.5, &tmp2);
		double beta = modf(yh+0.5, &tmp2);
		if (alpha < 0) ++alpha;
		if (beta < 0) ++beta;

		//hermite smoothing is optional
		//looks like my nvidia implementation doesn't do it
		//but it can look a little better
#ifdef HERMITE_SMOOTHING
		alpha = alpha*alpha * (3 - 2*alpha);
		beta = beta*beta * (3 - 2*beta);
#endif

		vec4 cij = Color_to_vec4(texdata[j0*w + i0]);
		vec4 ci1j = Color_to_vec4(texdata[j0*w + i1]);
		vec4 cij1 = Color_to_vec4(texdata[j1*w + i0]);
		vec4 ci1j1 = Color_to_vec4(texdata[j1*w + i1]);

		cij = scale_vec4(cij, (1-alpha)*(1-beta));
		ci1j = scale_vec4(ci1j, alpha*(1-beta));
		cij1 = scale_vec4(cij1, (1-alpha)*beta);
		ci1j1 = scale_vec4(ci1j1, alpha*beta);

		cij = add_vec4s(cij, ci1j);
		cij = add_vec4s(cij, cij1);
		cij = add_vec4s(cij, ci1j1);

		return cij;
	}
}

vec4 texture3D(GLuint tex, float x, float y, float z)
{
	int i0, j0, i1, j1, k0, k1;

	glTexture* t = &c->textures.a[tex];
	Color* texdata = (Color*)t->data;

	double dw = t->w - EPSILON;
	double dh = t->h - EPSILON;
	double dd = t->d - EPSILON;

	int w = t->w;
	int h = t->h;
	int d = t->d;
	int plane = w * t->h;
	double xw = x * dw;
	double yh = y * dh;
	double zd = z * dd;


	if (t->mag_filter == GL_NEAREST) {
		i0 = wrap(floor(xw), w, t->wrap_s);
		j0 = wrap(floor(yh), h, t->wrap_t);
		k0 = wrap(floor(zd), d, t->wrap_r);

		return Color_to_vec4(texdata[k0*plane + j0*w + i0]);

	} else {
		// LINEAR
		// This seems right to me since pixel centers are 0.5 but
		// this isn't exactly what's described in the spec or FoCG
		i0 = wrap(floor(xw - 0.5), w, t->wrap_s);
		j0 = wrap(floor(yh - 0.5), h, t->wrap_t);
		k0 = wrap(floor(zd - 0.5), d, t->wrap_r);
		i1 = wrap(floor(xw + 0.499999), w, t->wrap_s);
		j1 = wrap(floor(yh + 0.499999), h, t->wrap_t);
		k1 = wrap(floor(zd + 0.499999), d, t->wrap_r);

		double tmp2;
		double alpha = modf(xw+0.5, &tmp2);
		double beta = modf(yh+0.5, &tmp2);
		double gamma = modf(zd+0.5, &tmp2);
		if (alpha < 0) ++alpha;
		if (beta < 0) ++beta;
		if (gamma < 0) ++gamma;

		//hermite smoothing is optional
		//looks like my nvidia implementation doesn't do it
		//but it can look a little better
#ifdef HERMITE_SMOOTHING
		alpha = alpha*alpha * (3 - 2*alpha);
		beta = beta*beta * (3 - 2*beta);
		gamma = gamma*gamma * (3 - 2*gamma);
#endif

		vec4 cijk = Color_to_vec4(texdata[k0*plane + j0*w + i0]);
		vec4 ci1jk = Color_to_vec4(texdata[k0*plane + j0*w + i1]);
		vec4 cij1k = Color_to_vec4(texdata[k0*plane + j1*w + i0]);
		vec4 ci1j1k = Color_to_vec4(texdata[k0*plane + j1*w + i1]);
		vec4 cijk1 = Color_to_vec4(texdata[k1*plane + j0*w + i0]);
		vec4 ci1jk1 = Color_to_vec4(texdata[k1*plane + j0*w + i1]);
		vec4 cij1k1 = Color_to_vec4(texdata[k1*plane + j1*w + i0]);
		vec4 ci1j1k1 = Color_to_vec4(texdata[k1*plane + j1*w + i1]);

		cijk = scale_vec4(cijk, (1-alpha)*(1-beta)*(1-gamma));
		ci1jk = scale_vec4(ci1jk, alpha*(1-beta)*(1-gamma));
		cij1k = scale_vec4(cij1k, (1-alpha)*beta*(1-gamma));
		ci1j1k = scale_vec4(ci1j1k, alpha*beta*(1-gamma));
		cijk1 = scale_vec4(cijk1, (1-alpha)*(1-beta)*gamma);
		ci1jk1 = scale_vec4(ci1jk1, alpha*(1-beta)*gamma);
		cij1k1 = scale_vec4(cij1k1, (1-alpha)*beta*gamma);
		ci1j1k1 = scale_vec4(ci1j1k1, alpha*beta*gamma);

		cijk = add_vec4s(cijk, ci1jk);
		cijk = add_vec4s(cijk, cij1k);
		cijk = add_vec4s(cijk, ci1j1k);
		cijk = add_vec4s(cijk, cijk1);
		cijk = add_vec4s(cijk, ci1jk1);
		cijk = add_vec4s(cijk, cij1k1);
		cijk = add_vec4s(cijk, ci1j1k1);

		return cijk;
	}
}

// for now this should work
vec4 texture2DArray(GLuint tex, float x, float y, int z)
{
	int i0, j0, i1, j1;

	glTexture* t = &c->textures.a[tex];
	Color* texdata = (Color*)t->data;
	int w = t->w;
	int h = t->h;

	double dw = w - EPSILON;
	double dh = h - EPSILON;

	int plane = w * h;
	double xw = x * dw;
	double yh = y * dh;


	if (t->mag_filter == GL_NEAREST) {
		i0 = wrap(floor(xw), w, t->wrap_s);
		j0 = wrap(floor(yh), h, t->wrap_t);

		return Color_to_vec4(texdata[z*plane + j0*w + i0]);

	} else {
		// LINEAR
		// This seems right to me since pixel centers are 0.5 but
		// this isn't exactly what's described in the spec or FoCG
		i0 = wrap(floor(xw - 0.5), w, t->wrap_s);
		j0 = wrap(floor(yh - 0.5), h, t->wrap_t);
		i1 = wrap(floor(xw + 0.499999), w, t->wrap_s);
		j1 = wrap(floor(yh + 0.499999), h, t->wrap_t);

		double tmp2;
		double alpha = modf(xw+0.5, &tmp2);
		double beta = modf(yh+0.5, &tmp2);
		if (alpha < 0) ++alpha;
		if (beta < 0) ++beta;

		//hermite smoothing is optional
		//looks like my nvidia implementation doesn't do it
		//but it can look a little better
#ifdef HERMITE_SMOOTHING
		alpha = alpha*alpha * (3 - 2*alpha);
		beta = beta*beta * (3 - 2*beta);
#endif
		vec4 cij = Color_to_vec4(texdata[z*plane + j0*w + i0]);
		vec4 ci1j = Color_to_vec4(texdata[z*plane + j0*w + i1]);
		vec4 cij1 = Color_to_vec4(texdata[z*plane + j1*w + i0]);
		vec4 ci1j1 = Color_to_vec4(texdata[z*plane + j1*w + i1]);

		cij = scale_vec4(cij, (1-alpha)*(1-beta));
		ci1j = scale_vec4(ci1j, alpha*(1-beta));
		cij1 = scale_vec4(cij1, (1-alpha)*beta);
		ci1j1 = scale_vec4(ci1j1, alpha*beta);

		cij = add_vec4s(cij, ci1j);
		cij = add_vec4s(cij, cij1);
		cij = add_vec4s(cij, ci1j1);

		return cij;
	}
}

vec4 texture_rect(GLuint tex, float x, float y)
{
	int i0, j0, i1, j1;

	glTexture* t = &c->textures.a[tex];
	Color* texdata = (Color*)t->data;

	int w = t->w;
	int h = t->h;

	double xw = x;
	double yh = y;

	//TODO don't just use mag_filter all the time?
	//is it worth bothering?
	if (t->mag_filter == GL_NEAREST) {
		i0 = wrap(floor(xw), w, t->wrap_s);
		j0 = wrap(floor(yh), h, t->wrap_t);

		return Color_to_vec4(texdata[j0*w + i0]);

	} else {
		// LINEAR
		// This seems right to me since pixel centers are 0.5 but
		// this isn't exactly what's described in the spec or FoCG
		i0 = wrap(floor(xw - 0.5), w, t->wrap_s);
		j0 = wrap(floor(yh - 0.5), h, t->wrap_t);
		i1 = wrap(floor(xw + 0.499999), w, t->wrap_s);
		j1 = wrap(floor(yh + 0.499999), h, t->wrap_t);

		double tmp2;
		double alpha = modf(xw+0.5, &tmp2);
		double beta = modf(yh+0.5, &tmp2);
		if (alpha < 0) ++alpha;
		if (beta < 0) ++beta;

		//hermite smoothing is optional
		//looks like my nvidia implementation doesn't do it
		//but it can look a little better
#ifdef HERMITE_SMOOTHING
		alpha = alpha*alpha * (3 - 2*alpha);
		beta = beta*beta * (3 - 2*beta);
#endif

		vec4 cij = Color_to_vec4(texdata[j0*w + i0]);
		vec4 ci1j = Color_to_vec4(texdata[j0*w + i1]);
		vec4 cij1 = Color_to_vec4(texdata[j1*w + i0]);
		vec4 ci1j1 = Color_to_vec4(texdata[j1*w + i1]);

		cij = scale_vec4(cij, (1-alpha)*(1-beta));
		ci1j = scale_vec4(ci1j, alpha*(1-beta));
		cij1 = scale_vec4(cij1, (1-alpha)*beta);
		ci1j1 = scale_vec4(ci1j1, alpha*beta);

		cij = add_vec4s(cij, ci1j);
		cij = add_vec4s(cij, cij1);
		cij = add_vec4s(cij, ci1j1);

		return cij;
	}
}

vec4 texture_cubemap(GLuint texture, float x, float y, float z)
{
	glTexture* tex = &c->textures.a[texture];
	Color* texdata = (Color*)tex->data;

	float x_mag = (x < 0) ? -x : x;
	float y_mag = (y < 0) ? -y : y;
	float z_mag = (z < 0) ? -z : z;

	float s, t, max;

	int p, i0, j0, i1, j1;

	//there should be a better/shorter way to do this ...
	if (x_mag > y_mag) {
		if (x_mag > z_mag) {  //x largest
			max = x_mag;
			t = -y;
			if (x_mag == x) {
				p = 0;
				s = -z;
			} else {
				p = 1;
				s = z;
			}
		} else { //z largest
			max = z_mag;
			t = -y;
			if (z_mag == z) {
				p = 4;
				s = x;
			} else {
				p = 5;
				s = -x;
			}
		}
	} else {
		if (y_mag > z_mag) {  //y largest
			max = y_mag;
			s = x;
			if (y_mag == y) {
				p = 2;
				t = z;
			} else {
				p = 3;
				t = -z;
			}
		} else { //z largest
			max = z_mag;
			t = -y;
			if (z_mag == z) {
				p = 4;
				s = x;
			} else {
				p = 5;
				s = -x;
			}
		}
	}

	x = (s/max + 1.0f)/2.0f;
	y = (t/max + 1.0f)/2.0f;

	int w = tex->w;
	int h = tex->h;

	double dw = w - EPSILON;
	double dh = h - EPSILON;

	int plane = w*w;
	double xw = x * dw;
	double yh = y * dh;

	if (tex->mag_filter == GL_NEAREST) {
		i0 = wrap(floor(xw), w, tex->wrap_s);
		j0 = wrap(floor(yh), h, tex->wrap_t);

		vec4 tmpvec4 = Color_to_vec4(texdata[p*plane + j0*w + i0]);
		return tmpvec4;

	} else {
		// LINEAR
		// This seems right to me since pixel centers are 0.5 but
		// this isn't exactly what's described in the spec or FoCG
		i0 = wrap(floor(xw - 0.5), tex->w, tex->wrap_s);
		j0 = wrap(floor(yh - 0.5), tex->h, tex->wrap_t);
		i1 = wrap(floor(xw + 0.499999), tex->w, tex->wrap_s);
		j1 = wrap(floor(yh + 0.499999), tex->h, tex->wrap_t);

		double tmp2;
		double alpha = modf(xw+0.5, &tmp2);
		double beta = modf(yh+0.5, &tmp2);
		if (alpha < 0) ++alpha;
		if (beta < 0) ++beta;

		//hermite smoothing is optional
		//looks like my nvidia implementation doesn't do it
		//but it can look a little better
#ifdef HERMITE_SMOOTHING
		alpha = alpha*alpha * (3 - 2*alpha);
		beta = beta*beta * (3 - 2*beta);
#endif

		vec4 cij = Color_to_vec4(texdata[p*plane + j0*w + i0]);
		vec4 ci1j = Color_to_vec4(texdata[p*plane + j0*w + i1]);
		vec4 cij1 = Color_to_vec4(texdata[p*plane + j1*w + i0]);
		vec4 ci1j1 = Color_to_vec4(texdata[p*plane + j1*w + i1]);

		cij = scale_vec4(cij, (1-alpha)*(1-beta));
		ci1j = scale_vec4(ci1j, alpha*(1-beta));
		cij1 = scale_vec4(cij1, (1-alpha)*beta);
		ci1j1 = scale_vec4(ci1j1, alpha*beta);

		cij = add_vec4s(cij, ci1j);
		cij = add_vec4s(cij, cij1);
		cij = add_vec4s(cij, ci1j1);

		return cij;
	}
}

#undef EPSILON


//Raw draw functions that bypass the OpenGL pipeline and draw
//points/lines/triangles directly to the framebuffer, modify as needed.
//
//Example modifications:
//add the blending part of OpenGL to put_pixel
//change them to take vec4's instead of Color's
//change put_triangle to draw all one color or have a separate path/function
//that draws a single color triangle faster (no need to blend)
//
//pass the framebuffer in instead of drawing to c->back_buffer so 
//you can use it elsewhere, independently of a glContext
//etc.
//
void pglClearScreen()
{
	memset(c->back_buffer.buf, 255, c->back_buffer.w * c->back_buffer.h * 4);
}

void pglSetInterp(GLsizei n, GLenum* interpolation)
{
	c->programs.a[c->cur_program].vs_output_size = n;
	c->vs_output.size = n;

	memcpy(c->programs.a[c->cur_program].interpolation, interpolation, n*sizeof(GLenum));
	cvec_reserve_float(&c->vs_output.output_buf, n * MAX_VERTICES);

	//vs_output.interpolation would be already pointing at current program's array
	//unless the programs array was realloced since the last glUseProgram because
	//they've created a bunch of programs.  Unlikely they'd be changing a shader
	//before creating all their shaders but whatever.
	c->vs_output.interpolation = c->programs.a[c->cur_program].interpolation;
}




//TODO
//pglDrawRect(x, y, w, h)
//pglDrawPoint(x, y)
void pglDrawFrame()
{
	frag_func frag_shader = c->programs.a[c->cur_program].fragment_shader;

	for (float y=0.5; y<c->back_buffer.h; ++y) {
		for (float x=0.5; x<c->back_buffer.w; ++x) {

			//ignore z and w components
			c->builtins.gl_FragCoord.x = x;
			c->builtins.gl_FragCoord.y = y;

			c->builtins.discard = GL_FALSE;
			frag_shader(NULL, &c->builtins, c->programs.a[c->cur_program].uniform);
			if (!c->builtins.discard)
				draw_pixel(c->builtins.gl_FragColor, x, y);
		}
	}

}

void pglBufferData(GLenum target, GLsizei size, const GLvoid* data, GLenum usage)
{
	if (target != GL_ARRAY_BUFFER && target != GL_ELEMENT_ARRAY_BUFFER) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	//check for usage later

	target -= GL_ARRAY_BUFFER;
	if (c->bound_buffers[target] == 0) {
		if (!c->error)
			c->error = GL_INVALID_OPERATION;
		return;
	}

	// data can't be null for user_owned data
	if (!data) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	// TODO Should I change this in spec functions too?  Or just say don't mix them
	// otherwise bad things/undefined behavior??
	if (!c->buffers.a[c->bound_buffers[target]].user_owned) {
		free(c->buffers.a[c->bound_buffers[target]].data);
	}

	// user_owned buffer, just assign the pointer, will not free
	c->buffers.a[c->bound_buffers[target]].data = (u8*)data;

	c->buffers.a[c->bound_buffers[target]].user_owned = GL_TRUE;
	c->buffers.a[c->bound_buffers[target]].size = size;

	if (target == GL_ELEMENT_ARRAY_BUFFER) {
		c->vertex_arrays.a[c->cur_vertex_array].element_buffer = c->bound_buffers[target];
	}
}


void pglTexImage1D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLint border, GLenum format, GLenum type, const GLvoid* data)
{
	if (target != GL_TEXTURE_1D) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (border) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	// data can't be null for user_owned data
	if (!data) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	//ignore level for now

	int cur_tex = c->bound_textures[target-GL_TEXTURE_UNBOUND-1];

	c->textures.a[cur_tex].w = width;

	if (type != GL_UNSIGNED_BYTE) {

		return;
	}

	int components;
	if (format == GL_RED) components = 1;
	else if (format == GL_RG) components = 2;
	else if (format == GL_RGB || format == GL_BGR) components = 3;
	else if (format == GL_RGBA || format == GL_BGRA) components = 4;
	else {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	// TODO see pglBufferData
	if (!c->textures.a[cur_tex].user_owned)
		free(c->textures.a[cur_tex].data);

	//TODO support other internal formats? components should be of internalformat not format
	c->textures.a[cur_tex].data = (u8*)data;
	c->textures.a[cur_tex].user_owned = GL_TRUE;

	//TODO
	//assume for now always RGBA coming in and that's what I'm storing it as
}

void pglTexImage2D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid* data)
{
	//GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, GL_TEXTURE_1D_ARRAY, GL_TEXTURE_2D_ARRAY, GL_TEXTURE_RECTANGLE, or GL_TEXTURE_CUBE_MAP.
	//will add others as they're implemented
	if (target != GL_TEXTURE_2D &&
	    target != GL_TEXTURE_RECTANGLE &&
	    target != GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
	    target != GL_TEXTURE_CUBE_MAP_NEGATIVE_X &&
	    target != GL_TEXTURE_CUBE_MAP_POSITIVE_Y &&
	    target != GL_TEXTURE_CUBE_MAP_NEGATIVE_Y &&
	    target != GL_TEXTURE_CUBE_MAP_POSITIVE_Z &&
	    target != GL_TEXTURE_CUBE_MAP_NEGATIVE_Z) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (border) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	// data can't be null for user_owned data
	if (!data) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	//ignore level for now

	//TODO support other types?
	if (type != GL_UNSIGNED_BYTE) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	// TODO I don't actually support anything other than GL_RGBA for input or
	// internal format ... so I should probably make the others errors and
	// I'm not even checking internalFormat currently..
	int components;
	if (format == GL_RED) components = 1;
	else if (format == GL_RG) components = 2;
	else if (format == GL_RGB || format == GL_BGR) components = 3;
	else if (format == GL_RGBA || format == GL_BGRA) components = 4;
	else {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	int cur_tex;

	if (target == GL_TEXTURE_2D || target == GL_TEXTURE_RECTANGLE) {
		cur_tex = c->bound_textures[target-GL_TEXTURE_UNBOUND-1];

		c->textures.a[cur_tex].w = width;
		c->textures.a[cur_tex].h = height;


		// TODO see pglBufferData
		if (!c->textures.a[cur_tex].user_owned)
			free(c->textures.a[cur_tex].data);

		//TODO support other internal formats? components should be of internalformat not format
		// If you're using these pgl mapped functions, it assumes you are respecting
		// your own current unpack alignment settings already
		c->textures.a[cur_tex].data = (u8*)data;
		c->textures.a[cur_tex].user_owned = GL_TRUE;

	} else {  //CUBE_MAP
		/*
		 * TODO, doesn't make sense to call this six times when mapping, you'd set
		 * them all up beforehand and set the pointer once...so change this or
		 * make a pglCubeMapData() function?
		 *
		cur_tex = c->bound_textures[GL_TEXTURE_CUBE_MAP-GL_TEXTURE_UNBOUND-1];

		// TODO see pglBufferData
		if (!c->textures.a[cur_tex].user_owned)
			free(c->textures.a[cur_tex].data);

		if (width != height) {
			//TODO spec says INVALID_VALUE, man pages say INVALID_ENUM ?
			if (!c->error)
				c->error = GL_INVALID_VALUE;
			return;
		}

		int mem_size = width*height*6 * components;
		if (c->textures.a[cur_tex].w == 0) {
			c->textures.a[cur_tex].w = width;
			c->textures.a[cur_tex].h = width; //same cause square

		} else if (c->textures.a[cur_tex].w != width) {
			//TODO spec doesn't say all sides must have same dimensions but it makes sense
			//and this site suggests it http://www.opengl.org/wiki/Cubemap_Texture
			if (!c->error)
				c->error = GL_INVALID_VALUE;
			return;
		}

		target -= GL_TEXTURE_CUBE_MAP_POSITIVE_X; //use target as plane index

		c->textures.a[cur_tex].data = (u8*)data;
		c->textures.a[cur_tex].user_owned = GL_TRUE;
		*/

	} //end CUBE_MAP
}

void pglTexImage3D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, const GLvoid* data)
{
	if (target != GL_TEXTURE_3D && target != GL_TEXTURE_2D_ARRAY) {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	if (border) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	// data can't be null for user_owned data
	if (!data) {
		if (!c->error)
			c->error = GL_INVALID_VALUE;
		return;
	}

	//ignore level for now

	int cur_tex = c->bound_textures[target-GL_TEXTURE_UNBOUND-1];

	c->textures.a[cur_tex].w = width;
	c->textures.a[cur_tex].h = height;
	c->textures.a[cur_tex].d = depth;

	if (type != GL_UNSIGNED_BYTE) {
		// TODO
		return;
	}

	// TODO add error?  only support GL_RGBA for now
	int components;
	if (format == GL_RED) components = 1;
	else if (format == GL_RG) components = 2;
	else if (format == GL_RGB || format == GL_BGR) components = 3;
	else if (format == GL_RGBA || format == GL_BGRA) components = 4;
	else {
		if (!c->error)
			c->error = GL_INVALID_ENUM;
		return;
	}

	// TODO see pglBufferData
	if (!c->textures.a[cur_tex].user_owned)
		free(c->textures.a[cur_tex].data);

	//TODO support other internal formats? components should be of internalformat not format
	c->textures.a[cur_tex].data = (u8*)data;
	c->textures.a[cur_tex].user_owned = GL_TRUE;

	//TODO
	//assume for now always RGBA coming in and that's what I'm storing it as
}


void pglGetBufferData(GLuint buffer, GLvoid** data)
{
	// why'd you even call it?
	if (!data) {
		if (!c->error) {
			c->error = GL_INVALID_VALUE;
		}
		return;
	}

	if (buffer && buffer < c->buffers.size && !c->buffers.a[buffer].deleted) {
		*data = c->buffers.a[buffer].data;
	} else if (!c->error) {
		c->error = GL_INVALID_OPERATION; // matching error code of binding invalid buffer
	}
}

void pglGetTextureData(GLuint texture, GLvoid** data)
{
	// why'd you even call it?
	if (!data) {
		if (!c->error) {
			c->error = GL_INVALID_VALUE;
		}
		return;
	}

	if (texture < c->textures.size && !c->textures.a[texture].deleted) {
		*data = c->textures.a[texture].data;
	} else if (!c->error) {
		c->error = GL_INVALID_OPERATION; // matching error code of binding invalid buffer
	}
}


void put_pixel(Color color, int x, int y)
{
	u32* dest = &((u32*)c->back_buffer.lastrow)[-y*c->back_buffer.w + x];
	*dest = color.a << c->Ashift | color.r << c->Rshift | color.g << c->Gshift | color.b << c->Bshift;
}

//Should I have it take a glFramebuffer as paramater?
void put_line(Color the_color, float x1, float y1, float x2, float y2)
{
	float tmp;
	
	//always draw from left to right
	if (x2 < x1) {
		tmp = x1;
		x1 = x2;
		x2 = tmp;
		tmp = y1;
		y1 = y2;
		y2 = tmp;
	}
	
	//calculate slope and implicit line parameters once
	float m = (y2-y1)/(x2-x1);
	float A = y1 - y2;
	float B = x2 - x1;
	float C = x1*y2 -x2*y1;

	int x, y;

	float x_min = MAX(0, MIN(x1, x2));
	float x_max = MIN(c->back_buffer.w-1, MAX(x1, x2));
	float y_min = MAX(0, MIN(y1, y2));
	float y_max = MIN(c->back_buffer.h-1, MAX(y1, y2));
	
	//4 cases based on slope
	if (m <= -1) {			//(-infinite, -1]
		x = x1;
		for (y=y_max; y>=y_min; --y) {
			put_pixel(the_color, x, y);
			if (A*(x+0.5f) + B*(y-1) + C < 0)
				x++;
		}
	} else if (m <= 0) {	//(-1, 0]
		y = y1;
		for (x=x_min; x<=x_max; ++x) {
			put_pixel(the_color, x, y);
			if (A*(x+1) + B*(y-0.5f) + C > 0)
				y--;
		}
	} else if (m <= 1) {	//(0, 1]
		y = y1;
		for (x=x_min; x<=x_max; ++x) {
			put_pixel(the_color, x, y);
			if (A*(x+1) + B*(y+0.5f) + C < 0)
				y++;
		}
		
	} else {				//(1, +infinite)
		x = x1;
		for (y=y_min; y<=y_max; ++y) {
			put_pixel(the_color, x, y);
			if (A*(x+0.5f) + B*(y+1) + C > 0)
				x++;
		}
	}
}

void put_triangle(Color c1, Color c2, Color c3, vec2 p1, vec2 p2, vec2 p3)
{
	//can't think of a better/cleaner way to do this than these 8 lines
	float x_min = MIN(floor(p1.x), floor(p2.x));
	float x_max = MAX(ceil(p1.x), ceil(p2.x));
	float y_min = MIN(floor(p1.y), floor(p2.y));
	float y_max = MAX(ceil(p1.y), ceil(p2.y));
	
	x_min = MIN(floor(p3.x), x_min);
	x_max = MAX(ceil(p3.x),  x_max);
	y_min = MIN(floor(p3.y), y_min);
	y_max = MAX(ceil(p3.y),  y_max);

	x_min = MAX(0, x_min);
	x_max = MIN(c->back_buffer.w-1, x_max);
	y_min = MAX(0, y_min);
	y_max = MIN(c->back_buffer.h-1, y_max);
	
	//form implicit lines
	Line l12 = make_Line(p1.x, p1.y, p2.x, p2.y);
	Line l23 = make_Line(p2.x, p2.y, p3.x, p3.y);
	Line l31 = make_Line(p3.x, p3.y, p1.x, p1.y);
	
	float alpha, beta, gamma;
	Color c;

	float x, y;
	//y += 0.5f; //center of pixel
	
	// TODO(rswinkle): floor(  + 0.5f) like draw_triangle?
	for (y=y_min; y<=y_max; ++y) {
		for (x=x_min; x<=x_max; ++x) {
			gamma = line_func(&l12, x, y)/line_func(&l12, p3.x, p3.y);
			beta = line_func(&l31, x, y)/line_func(&l31, p2.x, p2.y);
			alpha = 1 - beta - gamma;
			
			if (alpha >= 0 && beta >= 0 && gamma >= 0)
				//if it's on the edge (==0), draw if the opposite vertex is on the same side as arbitrary point -1, -1
				//this is a deterministic way of choosing which triangle gets a pixel for trinagles that share
				//edges
				if ((alpha > 0 || line_func(&l23, p1.x, p1.y) * line_func(&l23, -1, -1) > 0) &&
					(beta >  0 || line_func(&l31, p2.x, p2.y) * line_func(&l31, -1, -1) > 0) &&
					(gamma > 0 || line_func(&l12, p3.x, p3.y) * line_func(&l12, -1, -1) > 0)) {
					//calculate interoplation here
						c.r = alpha*c1.r + beta*c2.r + gamma*c3.r;
						c.g = alpha*c1.g + beta*c2.g + gamma*c3.g;
						c.b = alpha*c1.b + beta*c2.b + gamma*c3.b;
						put_pixel(c, x, y);
				}
		}
	}
}


#undef PORTABLEGL_IMPLEMENTATION
#undef CVECTOR_float_IMPLEMENTATION
#endif

#ifdef MANGLE_TYPES
#undef vec2
#undef vec3
#undef vec4
#undef dvec2
#undef dvec3
#undef dvec4
#undef ivec2
#undef ivec3
#undef ivec4
#undef uvec2
#undef uvec3
#undef uvec4
#undef mat2
#undef mat3
#undef mat4
#undef Color
#undef Line
#undef Plane
#endif