git.maemo.org Git - sdlhildon/blob - sdlgles/test/attrib.c

   1 /* gles1 - a simple SDL_gles OpenGL|ES 1.1 sample
   2  *
   3  * This file is in the public domain, furnished "as is", without technical
   4  * support, and with no warranty, express or implied, as to its usefulness for
   5  * any purpose.
   6  */
   7
   8 #include <stdlib.h>
   9 #include <stdio.h>
  10 #include <stdbool.h>
  11 #include <assert.h>
  12
  13 #include <SDL.h>
  14 #include <SDL_gles.h>
  15
  16 #include <GLES/gl.h>
  17
  18 static SDL_Surface *screen;
  19 static SDL_GLES_Context *context;
  20
  21 static bool fullscreen = false;
  22
  23 static const float vertices[] ={-0.6f, -0.6f, -0.5f, /* Square 1 */
  24                                                                  0.3f, -0.6f, -0.5f,
  25                                                                 -0.6f,  0.8f,  0.1f,
  26                                                                  0.3f,  0.8f,  0.1f,
  27                                                                  0.3f,  0.8f,  0.1f, /* Degenerate vertices */
  28                                                                 -0.3f, -0.6f,  0.5f,
  29                                                                 -0.3f, -0.6f,  0.5f, /* Square 2 */
  30                                                                  0.6f, -0.6f,  0.5f,
  31                                                                 -0.3f,  0.8f, -0.1f,
  32                                                                  0.6f,  0.8f, -0.1f,
  33                                                                 };
  34 static const float colors[] =  { 1.0f,  0.0f,  0.0f, 1.0f,
  35                                                                  1.0f,  0.0f,  0.0f, 1.0f,
  36                                                                  1.0f,  0.0f,  0.0f, 1.0f,
  37                                                                  1.0f,  0.0f,  0.0f, 1.0f,
  38                                                                  0.0f,  0.0f,  0.0f, 1.0f,
  39                                                                  0.0f,  0.0f,  1.0f, 1.0f,
  40                                                                  0.0f,  0.0f,  1.0f, 1.0f,
  41                                                                  0.0f,  0.0f,  1.0f, 1.0f,
  42                                                                  0.0f,  0.0f,  1.0f, 1.0f,
  43                                                                  0.0f,  0.0f,  1.0f, 1.0f,
  44                                                                 };
  45
  46 static void draw()
  47 {
  48         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  49         glDrawArrays(GL_TRIANGLE_STRIP, 0, 10);
  50         SDL_GLES_SwapBuffers();
  51 }
  52
  53 static void toggle_fullscreen()
  54 {
  55         int res;
  56
  57         fullscreen = !fullscreen;
  58
  59         screen = SDL_SetVideoMode(0, 0, 16, SDL_SWSURFACE |
  60                 (fullscreen ? SDL_FULLSCREEN : 0));
  61         assert(screen);
  62
  63         res = SDL_GLES_SetVideoMode();
  64         assert(res == 0);
  65
  66         draw();
  67 }
  68
  69 int main()
  70 {
  71         int res, value = 0;
  72         res = SDL_Init(SDL_INIT_VIDEO);
  73         assert(res == 0);
  74
  75         res = SDL_GLES_Init(SDL_GLES_VERSION_1_1);
  76         assert(res == 0);
  77
  78         screen = SDL_SetVideoMode(0, 0, 16, SDL_SWSURFACE);
  79         assert(screen);
  80
  81         SDL_WM_SetCaption("SDLgles attrib test", "SDLgles v1 test");
  82         SDL_ShowCursor(SDL_DISABLE);
  83
  84 #define ENABLE_DEPTH_BUFFER 1
  85
  86 #ifdef ENABLE_DEPTH_BUFFER
  87         /* With a depth buffer, the red square will be partially over the blue sq. */
  88         res = SDL_GLES_SetAttribute(SDL_GLES_DEPTH_SIZE, 4);
  89         assert(res == 0);
  90
  91         res = SDL_GLES_GetAttribute(SDL_GLES_DEPTH_SIZE, &value);
  92         assert(res == 0);
  93         assert(value == 4);
  94         printf("Wanted depth buffer size is %d\n", value);
  95 #else
  96         /* Without a depth buffer, the blue square will be over the red square. */
  97         printf("Wanted depth buffer size is %d\n", 0);
  98 #endif
  99
 100         context = SDL_GLES_CreateContext();
 101         assert(context);
 102
 103         res = SDL_GLES_MakeCurrent(context);
 104         assert(res == 0);
 105
 106         value = 0;
 107         res = SDL_GLES_GetAttribute(SDL_GLES_DEPTH_SIZE, &value);
 108         assert(res == 0);
 109         printf("Depth buffer size is %d\n", value);
 110
 111         glMatrixMode(GL_MODELVIEW);
 112         glLoadIdentity();
 113
 114         glEnable(GL_DEPTH_TEST);
 115         glClearColor(0.0f, 0.2f, 0.0f, 0.0f);
 116         glEnableClientState(GL_VERTEX_ARRAY);
 117         glEnableClientState(GL_COLOR_ARRAY);
 118         glVertexPointer(3, GL_FLOAT, 0, vertices);
 119         glColorPointer(4, GL_FLOAT, 0, colors);
 120
 121         draw();
 122
 123         SDL_Event event;
 124         while (SDL_WaitEvent(&event)) {
 125                 switch (event.type) {
 126                         case SDL_QUIT:
 127                                 goto quit;
 128                         case SDL_MOUSEBUTTONDOWN:
 129                                 toggle_fullscreen();
 130                                 break;
 131                 }
 132         }
 133
 134 quit:
 135         SDL_GLES_DeleteContext(context);
 136
 137         SDL_GLES_Quit();
 138         SDL_Quit();
 139
 140         return 0;
 141 }
 142