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gb_gl.h
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gb_gl.h
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/* gb.h - v0.05 - OpenGL Helper Library - public domain
- no warranty implied; use at your own risk
This is a single header file with a bunch of useful stuff
for working with OpenGL
===========================================================================
YOU MUST
#define GBGL_IMPLEMENTATION
in EXACTLY _one_ C or C++ file that includes this header, BEFORE the
include like this:
#define GBGL_IMPLEMENTATION
#include "gb_gl.h"
All other files should just #include "gb_gl.h" without #define
Dependencies
NOTE: You may need change the path
This library REQUIRES "stb_image.h" for loading images from file
This library REQUIRES "gb.h" at this moment in time.
If you are using the font library (e.g. GBGL_NO_FONTS is _not_ defined):
This library then REQUIRES "stb_truetype.h" for ttf handling
This library then REQUIRES "stb_rect_pack.h"
NOTE(bill): I may remove these dependencies for the font handling by
embedding the needed types and procedures.
Optional Dependencies
"gb_math.h" as a lot of useful things in it over <math.h>.
Why not have a look at it?
Optional Defines
GBGL_NO_FONTS - Do no use font subsystem
GBGL_NO_BASIC_STATE - Do no use basic state subsystem
Steps for supporting dynamic reload:
You _MUST_ defined you own malloc and free that use whatever
permanent memory system you are using:
#define gbgl_malloc
#define gbgl_free
===========================================================================
Conventions used:
gbglTypesAreLikeThis (None core types)
gbgl_functions_and_variables_like_this
Prefer // Comments
Never use _t suffix for types (I think they are stupid...)
Version History:
0.06 - Enum convention change
0.05 - gbglColour
0.04e - Change brace style because why not?
0.04d - Use new gb.h file handling system
0.04c - Use new gb.h file handling system
0.04b - Work with the new gb.h
0.04a - Better Documentation
0.04 - Remove gb_math.h dependency
0.03a - Better Rounded Rect
0.03 - Basic State Rendering
0.02 - Font Caching and Rendering
0.01 - Initial Version
LICENSE
This software is dual-licensed to the public domain and under the following
license: you are granted a perpetual, irrevocable license to copy, modify,
publish, and distribute this file as you see fit.
WARNING
- This library is _highly_ experimental and features may not work as expected.
- This also means that many functions are not documented.
CREDITS
Written by Ginger Bill
*/
#ifndef GBGL_INCLUDE_GB_GL_H
#define GBGL_INCLUDE_GB_GL_H
#ifndef GB_IMPLEMENTATION
#include "gb.h"
#endif
#ifndef STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#endif
#if !defined(GBGL_NO_FONTS)
#ifndef STB_RECT_PACK_IMPLEMENTATION
#include "stb_rect_pack.h"
#endif
#ifndef STB_TRUETYPE_IMPLEMENTATION
#include "stb_truetype.h"
#endif
#endif
#if defined(GBGL_USE_GB_MATH)
#ifndef GB_MATH_IMPLEMENTATION
#include "gb_math.h"
#endif
#define gbgl_lerp(x, y, t) gb_lerp(x, y, t)
#define gbgl_sin(x) gb_sin(x)
#define gbgl_cos(x) gb_cos(x)
#define gbgl_abs(x) gb_abs(x)
#define gbgl_min(x, y) gb_min(x, y)
#define gbgl_max(x, y) gb_max(x, y)
#define gbgl_round(x) gb_round(x)
#else
#if !defined(GBGL_USE_CUSTOM_MATH)
#include <math.h>
#define gbgl_lerp(x, y, t) ((x)*(1.0f-(t)) + (y)*(t))
#define gbgl_sin(x) sinf(x)
#define gbgl_cos(x) cosf(x)
#define gbgl_abs(x) ((x) >= 0 ? (x) : -(x))
#define gbgl_min(x, y) ((x) < (y) ? (x) : (y))
#define gbgl_max(x, y) ((x) > (y) ? (x) : (y))
#define gbgl_round(x) (((x) >= 0.0f) ? floorf((x) + 0.5f) : ceilf((x) - 0.5f))
#endif
#endif
#define gbgl_clamp(x, lower, upper) gbgl_min(gbgl_max((x), (lower)), (upper))
#define gbgl_clamp01(x) gbgl_clamp(x, 0, 1)
#if defined(__cplusplus)
extern "C" {
#endif
#ifndef GBGL_DEF
#define GBGL_DEF extern
#endif
#ifndef gbgl_malloc
#define gbgl_malloc(sz) malloc(sz)
#endif
#ifndef gbgl_free
#define gbgl_free(ptr) free(ptr)
#endif
#ifndef GBGL_TAU
#define GBGL_TAU 6.28318530717958647692528676655900576f
#endif
////////////////////////////////////////////////////////////////
//
// Colour Type
// It's quite useful
// TODO(bill): Does this need to be in this library?
// Can I remove the anonymous struct extension?
//
#if defined(_MSC_VER)
#pragma warning(push)
#pragma warning(disable:4201)
#endif
typedef union gbglColour {
u32 rgba; // NOTE(bill): 0xaabbggrr in little endian
struct { u8 r, g, b, a; };
u8 e[4];
} gbglColour;
GB_STATIC_ASSERT(gb_size_of(gbglColour) == gb_size_of(u32));
#if defined(_MSC_VER)
#pragma warning(pop)
#endif
GB_DEF gbglColour gbgl_colour(f32 r, f32 g, f32 b, f32 a);
gb_global gbglColour const gbglColour_White = {0xffffffff};
gb_global gbglColour const gbglColour_Grey = {0xff808080};
gb_global gbglColour const gbglColour_Black = {0xff000000};
gb_global gbglColour const gbglColour_Red = {0xff0000ff};
gb_global gbglColour const gbglColour_Orange = {0xff0099ff};
gb_global gbglColour const gbglColour_Yellow = {0xff00ffff};
gb_global gbglColour const gbglColour_Green = {0xff00ff00};
gb_global gbglColour const gbglColour_Cyan = {0xffffff00};
gb_global gbglColour const gbglColour_Blue = {0xffff0000};
gb_global gbglColour const gbglColour_Violet = {0xffff007f};
gb_global gbglColour const gbglColour_Magenta = {0xffff00ff};
////////////////////////////////////////////////////////////////
//
// Generic Stuff
//
//
#ifndef GBGL_VERT_PTR_AA_GENERIC
#define GBGL_VERT_PTR_AA_GENERIC
// NOTE(bill) The "default" is just the f32 version
#define gbgl_vert_ptr_aa(index, element_count, Type, var_name) \
gbgl_vert_ptr_aa_f32(index, element_count, Type, var_name)
#define gbgl_vert_ptr_aa_f32(index, element_count, Type, var_name) do { \
glVertexAttribPointer(index, \
element_count, \
GL_FLOAT, \
false, \
gb_size_of(Type), \
(void const *)(gb_offset_of(Type, var_name))); \
glEnableVertexAttribArray(index); \
} while (0)
#define gbgl_vert_ptr_aa_u8(index, element_count, Type, var_name) do { \
glVertexAttribPointer(index, \
element_count, \
GL_UNSIGNED_BYTE, \
false, \
gb_size_of(Type), \
(void const *)(gb_offset_of(Type, var_name))); \
glEnableVertexAttribArray(index); \
} while (0)
#define gbgl_vert_ptr_aa_u8n(index, element_count, Type, var_name) do { \
glVertexAttribPointer(index, \
element_count, \
GL_UNSIGNED_BYTE, \
true, \
gb_size_of(Type), \
(void const *)(gb_offset_of(Type, var_name))); \
glEnableVertexAttribArray(index); \
} while (0)
#define gbgl_vert_ptr_aa_u32(index, element_count, Type, var_name) do { \
glVertexAttribIPointer(index, \
element_count, \
GL_UNSIGNED_INT, \
gb_size_of(Type), \
(void const *)(gb_offset_of(Type, var_name))); \
glEnableVertexAttribArray(index); \
} while (0)
#define gbgl_vert_ptr_aa_u16(index, element_count, Type, var_name) do { \
glVertexAttribIPointer(index, \
element_count, \
GL_UNSIGNED_SHORT, \
gb_size_of(Type), \
(void const *)(gb_offset_of(Type, var_name))); \
glEnableVertexAttribArray(index); \
} while (0)
#define gbgl_vert_ptr_aa_u16n(index, element_count, Type, var_name) do { \
glVertexAttribPointer(index, \
element_count, \
GL_UNSIGNED_SHORT, \
true, \
gb_size_of(Type), \
(void const *)(gb_offset_of(Type, var_name))); \
glEnableVertexAttribArray(index); \
} while (0)
#endif
GBGL_DEF u32 gbgl_make_sampler(u32 min_filter, u32 max_filter, u32 s_wrap, u32 t_wrap);
////////////////////////////////////////////////////////////////
//
// Data Buffers
//
//
typedef enum gbglBufferDataType {
gbglBufferData_u8 = GL_UNSIGNED_BYTE,
gbglBufferData_i8 = GL_BYTE,
gbglBufferData_u16 = GL_UNSIGNED_SHORT,
gbglBufferData_i16 = GL_SHORT,
gbglBufferData_f16 = GL_HALF_FLOAT,
gbglBufferData_u32 = GL_UNSIGNED_INT,
gbglBufferData_i32 = GL_INT,
gbglBufferData_f32 = GL_FLOAT,
gbglBufferData_f8, // NOTE(bill): This is not a "real" OpenGL type but it is needed for internal format enums
} gbglBufferDataType;
// NOTE(bill) index+1 = channels count
#if defined(GBGL_USE_SRGB_TEXTURE_FORMAT)
i32 const gbglTextureFormat[4] = { GL_RED, GL_RG, GL_SRGB8, GL_SRGB8_ALPHA8 };
#else
i32 const gbglTextureFormat[4] = { GL_RED, GL_RG, GL_RGB, GL_RGBA };
#endif
i32 const gbglInternalTextureFormat_8[4] = { GL_R8, GL_RG8, GL_RGB8, GL_RGBA8 };
i32 const gbglInternalTextureFormat_16[4] = { GL_R16, GL_RG16, GL_RGB16, GL_RGBA16 };
i32 const gbglInternalTextureFormat_32[4] = { GL_R32F, GL_RG32F, GL_RGB32F, GL_RGBA32F };
i32 const gbglInternalTextureFormat_u8[4] = { GL_R8UI, GL_RG8UI, GL_RGB8UI, GL_RGB8UI };
i32 const gbglInternalTextureFormat_i8[4] = { GL_R8I, GL_RG8I, GL_RGB8I, GL_RGB8I };
i32 const gbglInternalTextureFormat_f8[4] = { GL_R8, GL_RG8, GL_RGB8, GL_RGB8 };
i32 const gbglInternalTextureFormat_u16[4] = { GL_R16UI, GL_RG16UI, GL_RGB16UI, GL_RGB16UI };
i32 const gbglInternalTextureFormat_i16[4] = { GL_R16I, GL_RG16I, GL_RGB16I, GL_RGB16I };
i32 const gbglInternalTextureFormat_f16[4] = { GL_R16F, GL_RG16F, GL_RGB16F, GL_RGB16F };
i32 const gbglInternalTextureFormat_u32[4] = { GL_R32UI, GL_RG32UI, GL_RGB32UI, GL_RGBA32UI };
i32 const gbglInternalTextureFormat_i32[4] = { GL_R32I, GL_RG32I, GL_RGB32I, GL_RGBA32I };
i32 const gbglInternalTextureFormat_f32[4] = { GL_R32F, GL_RG32F, GL_RGB32F, GL_RGBA32F };
gb_inline i32 gbgl_texture_format(gbglBufferDataType data_type, i32 channel_count) {
GB_ASSERT(gb_is_between(channel_count, 1, 4));
switch (data_type) {
case gbglBufferData_u8: return gbglInternalTextureFormat_u8[channel_count-1];
case gbglBufferData_i8: return gbglInternalTextureFormat_i8[channel_count-1];
case gbglBufferData_f8: return gbglInternalTextureFormat_f8[channel_count-1];
case gbglBufferData_u16: return gbglInternalTextureFormat_u16[channel_count-1];
case gbglBufferData_i16: return gbglInternalTextureFormat_i16[channel_count-1];
case gbglBufferData_f16: return gbglInternalTextureFormat_f16[channel_count-1];
case gbglBufferData_u32: return gbglInternalTextureFormat_u32[channel_count-1];
case gbglBufferData_i32: return gbglInternalTextureFormat_i32[channel_count-1];
case gbglBufferData_f32: return gbglInternalTextureFormat_f32[channel_count-1];
}
return gbglInternalTextureFormat_f32[4-1];
}
typedef struct gbglTBO {
u32 buffer_obj_handle;
u32 buffer_handle;
} gbglTBO;
// NOTE(bill): usage_hint == (GL_STATIC_DRAW, GL_STREAM_DRAW, GL_DYNAMIC_DRAW)
GBGL_DEF u32 gbgl_make_vbo(void const *data, isize size, i32 usage_hint);
GBGL_DEF u32 gbgl_make_ebo(void const *data, isize size, i32 usage_hint);
GBGL_DEF gbglTBO gbgl_make_tbo(gbglBufferDataType data_type, i32 channel_count, void const *data, isize size, i32 usage_hint);
GBGL_DEF void gbgl_vbo_copy(u32 vbo_handle, void *const data, isize size, isize offset);
GBGL_DEF void gbgl_ebo_copy(u32 ebo_handle, void *const data, isize size, isize offset);
GBGL_DEF void gbgl_tbo_copy(gbglTBO tbo, void *const data, isize size, isize offset);
GBGL_DEF void gbgl_bind_vbo(u32 vbo_handle);
GBGL_DEF void gbgl_bind_ebo(u32 ebo_handle);
GBGL_DEF void gbgl_bind_tbo(gbglTBO tbo, i32 sampler_handle, i32 tex_unit);
// NOTE(bill): access = GL_WRITE_ONLY, etc.
GBGL_DEF void *gbgl_map_vbo(u32 vbo_handle, i32 access);
GBGL_DEF void *gbgl_map_ebo(u32 ebo_handle, i32 access);
GBGL_DEF void gbgl_unmap_vbo(void);
GBGL_DEF void gbgl_unmap_ebo(void);
////////////////////////////////////////////////////////////////
//
// Shader
//
//
typedef enum gbglShaderType {
gbglShader_Vertex,
gbglShader_Fragment,
gbglShader_Geometry,
gbglShader_Count,
} gbglShaderType;
i32 const gbglShaderMap[gbglShader_Count] = {
GL_VERTEX_SHADER, /* gbglShader_Vertex */
GL_FRAGMENT_SHADER, /* gbglShader_Fragment */
GL_GEOMETRY_SHADER, /* gbglShader_Geometry */
};
typedef enum gbglShaderError {
gbglShaderError_None,
gbglShaderError_ShaderCompile,
gbglShaderError_Linking,
gbglShaderError_UnableToReadFile,
gbglShaderError_Count,
} gbglShaderError;
#ifndef GBGL_MAX_UNIFORM_COUNT
#define GBGL_MAX_UNIFORM_COUNT 32
#endif
typedef struct gbglShader {
u32 shaders[gbglShader_Count];
u32 program;
i32 uniform_locs[GBGL_MAX_UNIFORM_COUNT];
char *uniform_names[GBGL_MAX_UNIFORM_COUNT];
i32 uniform_count;
u32 type_flags;
gbFile files[gbglShader_Count];
char base_name[64];
} gbglShader;
#ifndef GBGL_SHADER_FILE_EXTENSIONS_DEFINED
#define GBGL_SHADER_FILE_EXTENSIONS_DEFINED
gb_global char const *gbglShaderFileExtensions[gbglShader_Count] = {".vs", ".fs", ".gs"};
#endif
GBGL_DEF gbglShaderError gbgl_load_shader_from_file (gbglShader *s, u32 type_bits, char const *filename);
GBGL_DEF gbglShaderError gbgl_load_shader_from_memory_vf (gbglShader *s, char const *vert_source, char const *frag_source);
GBGL_DEF gbglShaderError gbgl_load_shader_from_memory_vfg(gbglShader *s, char const *vert_source, char const *frag_source, char const *geom_source);
GBGL_DEF void gbgl_destroy_shader (gbglShader *shader);
GBGL_DEF b32 gbgl_has_shader_changed(gbglShader *shader);
GBGL_DEF b32 gbgl_reload_shader (gbglShader *shader); // TODO(bill): Return an error code?
GBGL_DEF void gbgl_use_shader (gbglShader *shader);
GBGL_DEF b32 gbgl_is_shader_in_use (gbglShader *shader);
GBGL_DEF i32 gbgl_get_uniform(gbglShader *shader, char const *name);
GBGL_DEF void gbgl_set_uniform_int (gbglShader *s, char const *name, i32 i);
GBGL_DEF void gbgl_set_uniform_float (gbglShader *s, char const *name, f32 f);
GBGL_DEF void gbgl_set_uniform_vec2 (gbglShader *s, char const *name, f32 const *v);
GBGL_DEF void gbgl_set_uniform_vec3 (gbglShader *s, char const *name, f32 const *v);
GBGL_DEF void gbgl_set_uniform_vec4 (gbglShader *s, char const *name, f32 const *v);
GBGL_DEF void gbgl_set_uniform_mat4 (gbglShader *s, char const *name, f32 const *m);
GBGL_DEF void gbgl_set_uniform_mat4_count(gbglShader *s, char const *name, f32 const *m, isize count);
GBGL_DEF void gbgl_set_uniform_colour (gbglShader *s, char const *name, gbglColour col);
////////////////////////////////////////////////////////////////
//
// Texture
//
//
typedef enum gbglTextureType {
gbglgTexture_2D,
gbglgTexture_CubeMap,
gbglgTexture_Count,
} gbglTextureType;
gb_global i32 const GBGL_TEXTURE_TYPE[gbglgTexture_Count] = {
GL_TEXTURE_2D, /* gbglgTexture_2D */
GL_TEXTURE_CUBE_MAP, /* gbglgTexture_CubeMap */
};
typedef struct gbglTexture {
i32 width, height, channel_count;
gbglBufferDataType data_type;
gbglTextureType type;
u32 handle;
} gbglTexture;
GBGL_DEF b32 gbgl_load_texture2d_from_file (gbglTexture *texture, b32 flip_vertically, char const *filename, ...);
GBGL_DEF b32 gbgl_load_texture2d_from_memory(gbglTexture *texture, void const *data, i32 width, i32 height, i32 channel_count);
GBGL_DEF b32 gbgl_init_texture2d_coloured (gbglTexture *texture, gbglColour colour);
GBGL_DEF void gbgl_destroy_texture (gbglTexture *texture);
GBGL_DEF void gbgl_bind_texture2d(gbglTexture const *texture, u32 position, u32 sampler);
////////////////////////////////////////////////////////////////
//
// Render Buffer
//
//
// TODO(bill): Record depth and stencil and numerous colour attachments
typedef struct gbglRenderBuffer {
i32 width, height;
i32 channel_count;
u32 handle;
gbglTexture colour_texture;
} gbglRenderBuffer;
#define GBGL_MAX_RENDER_COLOUR_BUFFERS 16
gb_global u32 const gbglColourBufferAttachments[GBGL_MAX_RENDER_COLOUR_BUFFERS] = {
GL_COLOR_ATTACHMENT0,
GL_COLOR_ATTACHMENT1,
GL_COLOR_ATTACHMENT2,
GL_COLOR_ATTACHMENT3,
GL_COLOR_ATTACHMENT4,
GL_COLOR_ATTACHMENT5,
GL_COLOR_ATTACHMENT6,
GL_COLOR_ATTACHMENT7,
GL_COLOR_ATTACHMENT8,
GL_COLOR_ATTACHMENT9,
GL_COLOR_ATTACHMENT10,
GL_COLOR_ATTACHMENT11,
GL_COLOR_ATTACHMENT12,
GL_COLOR_ATTACHMENT13,
GL_COLOR_ATTACHMENT14,
GL_COLOR_ATTACHMENT15,
};
GBGL_DEF b32 gbgl_init_render_buffer (gbglRenderBuffer *rb, i32 width, i32 height, i32 channel_count);
GBGL_DEF void gbgl_destroy_render_buffer(gbglRenderBuffer *rb);
GBGL_DEF void gbgl_render_to_buffer(gbglRenderBuffer const *rb);
GBGL_DEF void gbgl_render_to_screen(i32 width, i32 height);
////////////////////////////////////////////////////////////////
//
// Font Stuff
//
//
#if !defined(GBGL_NO_FONTS)
typedef struct gbglGlyphMapKVPair {
char32 codepoint;
u16 index;
} gbglGlyphMapKVPair;
typedef struct gbglGlyphInfo {
f32 s0, t0, s1, t1;
i16 xoff, yoff;
f32 xadv;
} gbglGlyphInfo;
typedef struct gbglKernPair {
union {
i32 packed;
struct { u16 i0, i1; };
};
f32 kern;
} gbglKernPair;
typedef enum gbglJustifyType {
gbglJustify_Left,
gbglJustify_Centre,
gbglJustify_Right,
} gbglJustifyType;
typedef enum gbglTextParamType {
gbglTextParam_Invalid,
gbglTextParam_MaxWidth,
gbglTextParam_Justify,
gbglTextParam_TextureFilter,
gbglTextParam_Count,
} gbglTextParamType;
typedef struct gbglTextParam {
gbglTextParamType type;
union {
f32 val_f32;
i32 val_i32;
};
} gbglTextParam;
typedef struct gbglFont {
isize glyph_count;
isize kern_pair_count;
i32 bitmap_width, bitmap_height;
f32 size;
i32 ascent, descent, line_gap;
char *ttf_filename;
gbglTexture texture;
gbglGlyphMapKVPair *glyph_map;
gbglGlyphInfo * glyphs;
gbglKernPair * kern_table;
struct gbglFont *next; // NOTE(bill): Allow as linked list
} gbglFont;
typedef struct gbglFontCachedTTF {
char * name;
u8 * ttf;
stbtt_fontinfo finfo;
struct gbglFontCachedTTF *next;
} gbglFontCachedTTF;
typedef struct gbglFontCache {
isize font_char_list_count;
char *font_char_list;
isize codepoint_count;
char32 *codepoints;
stbtt_pack_range *ranges;
stbtt_packedchar *packed_char_data;
stbrp_rect * rect_cache;
gbglFontCachedTTF *ttf_buffer;
gbglFont * fonts;
} gbglFontCache;
#if 0
GBGL_DEF void gbgl_destroy_font_cache(gbglFontCache *fc);
#endif
// NOTE(bill): gbgl_load_font_from_file will load from file if it is not found
GBGL_DEF gbglFont *gbgl_load_font_from_file (gbglFontCache *fc, char const *ttf_filename, f32 font_size);
GBGL_DEF gbglFont *gbgl_get_font_only_from_cache(gbglFontCache *fc, char const *ttf_filename, f32 font_size);
GBGL_DEF gbglFont *gbgl_cache_font (gbglFontCache *fc, char const *ttf_filename, f32 font_size);
GBGL_DEF b32 gbgl_get_packed_font_dim (gbglFontCache *cache, gbglFontCachedTTF *ttf, i32 *width, i32 *height);
GBGL_DEF gbglGlyphInfo *gbgl_get_glyph_info (gbglFont *font, char32 codepoint, isize *out_index);
GBGL_DEF f32 gbgl_get_font_kerning_from_glyph_indices(gbglFont *font, isize left_index, isize right_index);
GBGL_DEF void gbgl_get_string_dimensions (gbglFont *font, char const *str, f32 *out_width, f32 *out_height);
GBGL_DEF f32 gbgl_get_sub_string_width (gbglFont *font, char const *str, isize char_count);
GBGL_DEF i32 gbgl_get_wrapped_line_count (gbglFont *font, char const *str, isize max_len, isize max_width);
GBGL_DEF f32 gbgl_get_string_width (gbglFont *font, char const *str, isize max_len);
#endif
////////////////////////////////////////////////////////////////
//
// Basic State
//
//
#if !defined(GBGL_NO_BASIC_STATE)
#ifndef GBGL_BS_MAX_VERTEX_COUNT
#define GBGL_BS_MAX_VERTEX_COUNT 32
#endif
#ifndef GBGL_BS_MAX_INDEX_COUNT
#define GBGL_BS_MAX_INDEX_COUNT 6
#endif
#if !defined(GBGL_NO_FONTS)
#ifndef GBGL_MAX_RENDER_STRING_LENGTH
#define GBGL_MAX_RENDER_STRING_LENGTH 4096
#endif
#ifndef gbglTextParam_Stack_size
#define gbglTextParam_Stack_size 128
#endif
#ifndef GBGL_FONT_CHAR_LIST
#define GBGL_FONT_CHAR_LIST \
"Āā㥹ĆćĈĉĊċČčĎďĐđĒēĔĕĖėĘęĚěĜĝĞğĠġĢģĤĥĨĩĪīĬĭĮįİıIJijĴĵĶķĸĹĺĻļĽľŁł"\
"ŃńŅņņŇňʼnŊŋŌōōŎŏŐőŒœŕŖŗŘřŚśŜŝŞşŠšŢţŤťŨũŪūŬŭŮůŰűŲųŴŵŶŷŸŹźŻżŽža!ö"\
"\"#$%%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"\
"ŠšŒœŸÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõøùúûüýþÿ®™£"\
" \t\r\n"
#endif
#ifndef GBGL_PT_TO_PX_SCALE
#define GBGL_PT_TO_PX_SCALE (96.0f / 72.0f)
#endif
#ifndef GBGL_TAB_CHARACTER_WIDTH
#define GBGL_TAB_CHARACTER_WIDTH 4
#endif
#endif
typedef struct gbglBasicVertex {
f32 x, y;
f32 u, v;
} gbglBasicVertex;
typedef struct gbglBasicState {
gbglBasicVertex vertices[GBGL_BS_MAX_VERTEX_COUNT];
u16 indices[GBGL_BS_MAX_INDEX_COUNT];
u32 vao, vbo, ebo;
u32 nearest_sampler;
u32 linear_sampler;
u32 mipmap_sampler;
gbglShader ortho_tex_shader;
gbglShader ortho_col_shader;
f32 ortho_mat[16];
i32 width, height;
#if !defined(GBGL_NO_FONTS)
gbglFontCache font_cache;
gbglShader font_shader;
gbglBasicVertex font_vertices[GBGL_MAX_RENDER_STRING_LENGTH * 4];
u16 font_indices[GBGL_MAX_RENDER_STRING_LENGTH * 6];
u32 font_vao, font_vbo, font_ebo;
char font_text_buffer[GBGL_MAX_RENDER_STRING_LENGTH * 4]; // NOTE(bill): Maximum of 4 bytes per char for utf-8
u32 font_samplers[2];
gbglTextParam text_param_stack[gbglTextParam_Stack_size];
isize text_param_stack_count;
gbglTextParam text_params[gbglTextParam_Count];
#endif
} gbglBasicState;
GBGL_DEF void gbgl_bs_init(gbglBasicState *bs, i32 window_width, i32 window_height);
GBGL_DEF void gbgl_bs_set_resolution(gbglBasicState *bs, i32 window_width, i32 window_height);
GBGL_DEF void gbgl_bs_begin(gbglBasicState *bs, i32 window_width, i32 window_height);
GBGL_DEF void gbgl_bs_end(gbglBasicState *bs);
GBGL_DEF void gbgl_bs_draw_textured_rect(gbglBasicState *bs, gbglTexture *tex, f32 x, f32 y, f32 w, f32 h, b32 v_up);
GBGL_DEF void gbgl_bs_draw_rect(gbglBasicState *bs, f32 x, f32 y, f32 w, f32 h, gbglColour col);
GBGL_DEF void gbgl_bs_draw_rect_outline(gbglBasicState *bs, f32 x, f32 y, f32 w, f32 h, gbglColour col, f32 thickness);
GBGL_DEF void gbgl_bs_draw_quad(gbglBasicState *bs,
f32 x0, f32 y0,
f32 x1, f32 y1,
f32 x2, f32 y2,
f32 x3, f32 y3,
gbglColour col);
GBGL_DEF void gbgl_bs_draw_quad_outline(gbglBasicState *bs,
f32 x0, f32 y0,
f32 x1, f32 y1,
f32 x2, f32 y2,
f32 x3, f32 y3,
gbglColour col, f32 thickness);
GBGL_DEF void gbgl_bs_draw_line(gbglBasicState *bs, f32 x0, f32 y0, f32 x1, f32 y1, gbglColour col, f32 thickness);
GBGL_DEF void gbgl_bs_draw_elliptical_arc(gbglBasicState *bs, f32 x, f32 y, f32 radius_a, f32 radius_b, f32 min_angle, f32 max_angle, gbglColour col);
GBGL_DEF void gbgl_bs_draw_elliptical_arc_outline(gbglBasicState *bs, f32 x, f32 y, f32 radius_a, f32 radius_b,
f32 min_angle, f32 max_angle, gbglColour col, f32 thickness);
GBGL_DEF void gbgl_bs_draw_circle(gbglBasicState *bs, f32 x, f32 y, f32 radius, gbglColour col);
GBGL_DEF void gbgl_bs_draw_circle_outline(gbglBasicState *bs, f32 x, f32 y, f32 radius, gbglColour col, f32 thickness);
// Corners Flags:
// 1 - Bottom Left
// 2 - Bottom Right
// 4 - Top Right
// 8 - Top Left
// NOTE(bill): Apple, please don't sue me!
GBGL_DEF void gbgl_bs_draw_rounded_rect_corners(gbglBasicState *bs, f32 x, f32 y, f32 w, f32 h, f32 roundness, gbglColour col, u32 corners);
GBGL_DEF void gbgl_bs_draw_rounded_rect(gbglBasicState *bs, f32 x, f32 y, f32 w, f32 h, f32 roundness, gbglColour col);
GBGL_DEF void gbgl_bs_draw_rounded_rect_corners_outline(gbglBasicState *bs, f32 x, f32 y, f32 w, f32 h, f32 roundness, gbglColour col, f32 thickness, u32 corners);
GBGL_DEF void gbgl_bs_draw_rounded_rect_outline(gbglBasicState *bs, f32 x, f32 y, f32 w, f32 h, f32 roundness, gbglColour col, f32 thickness);
#if !defined(GBGL_NO_FONTS)
GBGL_DEF isize gbgl_bs_draw_substring(gbglBasicState *bs, gbglFont *font, f32 x, f32 y, gbglColour col, char const *str, isize len);
GBGL_DEF isize gbgl_bs_draw_string (gbglBasicState *bs, gbglFont *font, f32 x, f32 y, gbglColour col, char const *fmt, ...);
GBGL_DEF isize gbgl_bs_draw_string_va(gbglBasicState *bs, gbglFont *font, f32 x, f32 y, gbglColour col, char const *fmt, va_list va);
#endif
#endif
#if defined(__cplusplus)
}
#endif
#endif
////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////
#if defined(GBGL_IMPLEMENTATION)
gb_inline gbglColour gbgl_colour(f32 r, f32 g, f32 b, f32 a) {
gbglColour result;
result.r = cast(u8)(gbgl_clamp01(r) * 255.0f);
result.g = cast(u8)(gbgl_clamp01(g) * 255.0f);
result.b = cast(u8)(gbgl_clamp01(b) * 255.0f);
result.a = cast(u8)(gbgl_clamp01(a) * 255.0f);
return result;
}
u32 gbgl_make_sampler(u32 min_filter, u32 max_filter, u32 s_wrap, u32 t_wrap) {
u32 samp;
glGenSamplers(1, &samp);
glSamplerParameteri(samp, GL_TEXTURE_MIN_FILTER, min_filter);
glSamplerParameteri(samp, GL_TEXTURE_MAG_FILTER, max_filter);
glSamplerParameteri(samp, GL_TEXTURE_WRAP_S, s_wrap);
glSamplerParameteri(samp, GL_TEXTURE_WRAP_T, t_wrap);
return samp;
}
////////////////////////////////////////////////////////////////
//
// Data Buffers
//
//
gb_inline u32 gbgl__make_buffer(isize size, void const *data, i32 target, i32 usage_hint) {
u32 buffer_handle;
glGenBuffers(1, &buffer_handle);
glBindBuffer(target, buffer_handle);
glBufferData(target, size, data, usage_hint);
return buffer_handle;
}
gb_inline void gbgl__buffer_copy(u32 buffer_handle, i32 target, void const *data, isize size, isize offset) {
glBindBuffer(target, buffer_handle);
glBufferSubData(target, offset, size, data);
}
// NOTE(bill): usage_hint == (GL_STATIC_DRAW, GL_STREAM_DRAW, GL_DYNAMIC_DRAW)
gb_inline u32 gbgl_make_vbo(void const *data, isize size, i32 usage_hint) {
return gbgl__make_buffer(size, data, GL_ARRAY_BUFFER, usage_hint);
}
gb_inline u32 gbgl_make_ebo(void const *data, isize size, i32 usage_hint) {
return gbgl__make_buffer(size, data, GL_ELEMENT_ARRAY_BUFFER, usage_hint);
}
gb_inline gbglTBO gbgl_make_tbo(gbglBufferDataType data_type, i32 channel_count, void const *data, isize size, i32 usage_hint) {
gbglTBO tbo;
i32 internal_format;
tbo.buffer_obj_handle = gbgl__make_buffer(size, data, GL_TEXTURE_BUFFER, usage_hint);
glGenTextures(1, &tbo.buffer_handle);
glBindTexture(GL_TEXTURE_BUFFER, tbo.buffer_handle);
internal_format = gbgl_texture_format(data_type, channel_count);
glTexBuffer(GL_TEXTURE_BUFFER, internal_format, tbo.buffer_obj_handle);
return tbo;
}
gb_inline void gbgl_vbo_copy(u32 vbo_handle, void *const data, isize size, isize offset) {
gbgl__buffer_copy(vbo_handle, GL_ARRAY_BUFFER, data, size, offset);
}
gb_inline void gbgl_ebo_copy(u32 ebo_handle, void *const data, isize size, isize offset) {
gbgl__buffer_copy(ebo_handle, GL_ELEMENT_ARRAY_BUFFER, data, size, offset);
}
gb_inline void gbgl_tbo_copy(gbglTBO tbo, void *const data, isize size, isize offset) {
gbgl__buffer_copy(tbo.buffer_obj_handle, GL_TEXTURE_BUFFER, data, size, offset);
}
gb_inline void gbgl_bind_vbo(u32 vbo_handle) { glBindBuffer(GL_ARRAY_BUFFER, vbo_handle); }
gb_inline void gbgl_bind_ebo(u32 ebo_handle) { glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo_handle); }
gb_inline void gbgl_bind_tbo(gbglTBO tbo, i32 sampler_handle, i32 tex_unit) {
glActiveTexture(GL_TEXTURE0 + tex_unit);
glBindTexture(GL_TEXTURE_BUFFER, tbo.buffer_handle);
glBindSampler(0, sampler_handle);
}
// NOTE(bill): access = GL_WRITE_ONLY, etc.
gb_inline void * gbgl_map_vbo(u32 vbo_handle, i32 access) {
gbgl_bind_vbo(vbo_handle);
return glMapBuffer(GL_ARRAY_BUFFER, access);
}
gb_inline void * gbgl_map_ebo(u32 ebo_handle, i32 access) {
gbgl_bind_ebo(ebo_handle);
return glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, access);
}
gb_inline void gbgl_unmap_vbo(void) { glUnmapBuffer(GL_ARRAY_BUFFER); }
gb_inline void gbgl_unmap_ebo(void) { glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER); }
////////////////////////////////////////////////////////////////
//
// Shader
//
//
gbglShaderError gbgl__load_single_shader_from_file(gbglShader *shader, gbglShaderType type, char const *name) {
gbglShaderError err = gbglShaderError_None;
gbFileError ferr;
gb_local_persist char filepath[1024];
gb_snprintf(filepath, gb_count_of(filepath), "%s%s", name, gbglShaderFileExtensions[type]);
ferr = gb_file_open(&shader->files[type], filepath);
if (ferr != gbFileError_None) {
err = gbglShaderError_UnableToReadFile;
} else {
gb_local_persist char info_log[4096];
i64 file_size = gb_file_size(&shader->files[type]);
char *file_source = cast(char *)gbgl_malloc(file_size+1);
GB_ASSERT_NOT_NULL(file_source);
if (file_source) {
i32 params;
gb_file_read_at(&shader->files[type], file_source, file_size, 0);
file_source[file_size] = '\0';
shader->shaders[type] = glCreateShader(gbglShaderMap[type]);
glShaderSource(shader->shaders[type], 1, &file_source, NULL);
glCompileShader(shader->shaders[type]);
glGetShaderiv(shader->shaders[type], GL_COMPILE_STATUS, ¶ms);
if (!params) {
gb_printf_err("Shader Source:\n%s\n", file_source);
glGetShaderInfoLog(shader->shaders[type], gb_size_of(info_log), NULL, info_log);
gb_printf_err("Shader compilation failed:\n %s\n", info_log);
err = gbglShaderError_ShaderCompile;
}
gbgl_free(file_source);
}
gb_file_close(&shader->files[type]);
}
return err;
}
gbglShaderError gbgl__load_single_shader_from_memory(gbglShader *s, gbglShaderType type, char const *text) {
gbglShaderError err = gbglShaderError_None;
i32 status;
s->shaders[type] = glCreateShader(gbglShaderMap[type]);
glShaderSource(s->shaders[type], 1, &text, 0);
glCompileShader(s->shaders[type]);
glGetShaderiv(s->shaders[type], GL_COMPILE_STATUS, &status);
if (!status) {
gb_local_persist char log_info[4096];
i32 total_len, log_len;
gb_printf_err("Unable to compile shader: %s\n", text);
glGetShaderiv(s->shaders[type], GL_INFO_LOG_LENGTH, &status);
total_len = status;
glGetShaderInfoLog(s->shaders[type], 4095, &log_len, log_info);
gb_printf_err(log_info);
err = gbglShaderError_ShaderCompile;
}
return err;