tests/gltest.c

   1 //RcB: LINK "-lGL"
   2 //RcB: LINK "-lSDL"
   3 #include <SDL/SDL_opengl.h>
   4 #include <SDL/SDL.h>
   5 #include <stdio.h>
   6 #include <stdint.h>
   7 typedef union {
   8         struct colors {
   9                 uint8_t r,g,b,a;
  10         } colors;
  11         uint32_t val;
  12 } rgba_t;
  13 #define RGB(R,G,B) ((rgba_t) {.colors.r = R, .colors.g = G, .colors.b = B, .colors.a = 0xff})
  14
  15 #define VMODE_W 320
  16 #define VMODE_H 240
  17 #define PIC_W 17
  18 #define PIC_H 17
  19
  20 static rgba_t pic[PIC_H][PIC_W];
  21 GLuint texid;
  22
  23 void fill() {
  24         int x,y;
  25 #define COL1 RGB(0x0, 0xff, 0)
  26 #define COL2 RGB(0xff, 0xff, 0xff)
  27         for(y=0; y<PIC_H; y++) for(x=0;x<PIC_W;x++)
  28                 if(y == 4 || x == 4) pic[y][x] = COL2;
  29                 else pic[y][x] = COL1;
  30 }
  31 void draw_shit() {
  32         glBindTexture(GL_TEXTURE_2D, texid);
  33         glBegin(GL_QUADS);
  34 #if 0
  35         glTexCoord2f(0,0); glVertex2i(-1,-1);
  36         glTexCoord2f(1,0); glVertex2i( 1,-1);
  37         glTexCoord2f(1,1); glVertex2i( 1, 1);
  38         glTexCoord2f(0,1); glVertex2i(-1, 1);
  39 #else
  40         glTexCoord2f(0,0); glVertex2i(-1,1);
  41         glTexCoord2f(1,0); glVertex2i(1,1);
  42         glTexCoord2f(1,1); glVertex2i(1,-1);
  43         glTexCoord2f(0,1); glVertex2i(-1, -1);
  44
  45 #endif
  46         glEnd();
  47         SDL_GL_SwapBuffers();
  48 }
  49 void video_init(void) {
  50         fill();
  51         SDL_Init(SDL_INIT_VIDEO);
  52         SDL_Surface *surface = SDL_SetVideoMode(VMODE_W, VMODE_H, 32, SDL_OPENGL);
  53         glViewport(0, 0, PIC_W, PIC_H);
  54         glMatrixMode(GL_PROJECTION);                       // Select The Projection Matrix
  55         glLoadIdentity();                          // Reset The Projection Matrix
  56         glEnable(GL_TEXTURE_2D);
  57         glGenTextures(1, &texid);
  58         glBindTexture(GL_TEXTURE_2D, texid);
  59         int mode = GL_RGBA;
  60         glTexImage2D(GL_TEXTURE_2D, 0, mode, PIC_W, PIC_H, 0, mode, GL_UNSIGNED_BYTE, pic);
  61         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  62         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  63         dprintf(2, "%s\n", glGetString(GL_RENDERER));
  64 }
  65 int main() {
  66         video_init();
  67
  68         SDL_Event sdl_event;
  69         while(1) {
  70                 while (SDL_PollEvent(&sdl_event)) {
  71                         switch (sdl_event.type) {
  72                                 case SDL_QUIT:
  73                                         goto dun;
  74                         }
  75                 }
  76                 draw_shit();
  77                 SDL_Delay(20);
  78         }
  79         dun:
  80         SDL_Quit();
  81 }