add renderttf.cpp for #199

src/Makefile

@@ -77,6 +77,7 @@ CLIENT_OBJS= \
 	engine/render/renderparticles.o \
 	engine/render/rendersky.o \
 	engine/render/rendertext.o \
+	engine/render/renderttf.o \
 	engine/render/rendertimers.o \
 	engine/render/renderva.o \
 	engine/render/renderwindow.o \

src/engine/render/renderttf.cpp

@@ -0,0 +1,77 @@
+/** @brief SDL2_TTF text renderer
+ * 
+ * This file implements the wrapper functions needed to use SDL_TTF in the applications
+ * where Tessfont/rendertext.cpp would have been used, allowing for any TTF font and
+ * any Unicode character to be renderered at any font size, which are all limitations
+ * of the legacy Tessfont font sampling system.
+ * 
+ */
+#include "SDL_ttf.h"
+
+#include "../libprimis-headers/cube.h"
+#include "../../shared/geomexts.h"
+#include "../../shared/glemu.h"
+#include "../../shared/glexts.h"
+
+#include "rendergl.h"
+#include "rendertext.h"
+#include "shaderparam.h"
+#include "texture.h"
+#include "renderwindow.h"
+
+//starts up SDL2_TTF
+bool initttf()
+{
+    if(TTF_Init() < 0)
+    {
+        return false;
+    }
+    return true;
+}
+
+//opens a font with the given path and size in points
+//if fails, returns nullptr
+TTF_Font* openfont(const char * path, int size)
+{
+    TTF_Font* f = TTF_OpenFont(path, size);
+    TTF_SetFontStyle(f, TTF_STYLE_NORMAL);
+    TTF_SetFontOutline(f, 0);
+    TTF_SetFontKerning(f, 1);
+    TTF_SetFontHinting(f, TTF_HINTING_NORMAL);
+    return f;
+}
+
+//draws a string to the coordinates x, y in the current hud context at a scale factor `scale`
+//with a (BGRA) SDL_Color value as passed to its third parameter
+void renderttf(TTF_Font* f, const char* message, SDL_Color col, int x, int y, float scale)
+{
+    glEnable(GL_BLEND);
+    glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
+    GLuint tex;
+    glGenTextures(1, &tex);
+    SDL_Surface* text = TTF_RenderUTF8_Blended(f, message, col);
+    glBindTexture(GL_TEXTURE_RECTANGLE, tex);
+    //need to load it in reversed because of how SDL_ttf renders
+    glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA, text->w, text->h, 0, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8_REV, text->pixels);
+
+    float w = text->w*scale, //if debugfullscreen, set to hudw/hudh size; if not, do small size
+          h = text->h*scale;
+    SETSHADER(hudrect);
+    gle::colorf(1, 1, 1, 1);
+    glBindTexture(GL_TEXTURE_RECTANGLE, tex);
+    int tw = text->w,
+        th = text->h;
+    gle::defvertex(2);
+    gle::deftexcoord0();
+    gle::begin(GL_TRIANGLE_STRIP);
+    gle::attribf(x+w, y);  gle::attribf(tw, 0);
+    gle::attribf(x, y);    gle::attribf(0, 0);
+    gle::attribf(x+w,y+h); gle::attribf(tw, th);
+    gle::attribf(x,y+h);   gle::attribf(0, th);
+    gle::end();
+    //clean up
+    hudshader->set();
+    glDeleteTextures(1, &tex);
+    SDL_FreeSurface(text);
+}
+

src/engine/render/renderttf.h

@@ -0,0 +1,3 @@
+extern bool initttf();
+extern TTF_Font* openfont(const char * path, int size);
+extern void renderttf(TTF_Font* f, const char* message, SDL_Color col, int x, int y, float scale = 1.f);