test/testgl2.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 19 Jul 2006 04:24:41 +0000
changeset 1915 a228436a2404
parent 1914 051df511279c
child 1916 c773b0c0ac89
permissions -rw-r--r--
Implemented multi-window OpenGL program with test framework.
     1 #include <stdlib.h>
     2 #include <stdio.h>
     3 #include <string.h>
     4 #include <math.h>
     5 
     6 #include "common.h"
     7 
     8 #ifdef __MACOS__
     9 #define HAVE_OPENGL
    10 #endif
    11 
    12 #ifdef HAVE_OPENGL
    13 
    14 #include "SDL_opengl.h"
    15 
    16 /* Undefine this if you want a flat cube instead of a rainbow cube */
    17 #define SHADED_CUBE
    18 
    19 static CommonState *state;
    20 static SDL_GLContext context;
    21 
    22 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
    23 static void
    24 quit(int rc)
    25 {
    26     if (context) {
    27         SDL_GL_MakeCurrent(0, NULL);
    28         SDL_GL_DeleteContext(context);
    29     }
    30     CommonQuit(state);
    31     exit(rc);
    32 }
    33 
    34 static void
    35 Render()
    36 {
    37     static float color[8][3] = {
    38         {1.0, 1.0, 0.0},
    39         {1.0, 0.0, 0.0},
    40         {0.0, 0.0, 0.0},
    41         {0.0, 1.0, 0.0},
    42         {0.0, 1.0, 1.0},
    43         {1.0, 1.0, 1.0},
    44         {1.0, 0.0, 1.0},
    45         {0.0, 0.0, 1.0}
    46     };
    47     static float cube[8][3] = {
    48         {0.5, 0.5, -0.5},
    49         {0.5, -0.5, -0.5},
    50         {-0.5, -0.5, -0.5},
    51         {-0.5, 0.5, -0.5},
    52         {-0.5, 0.5, 0.5},
    53         {0.5, 0.5, 0.5},
    54         {0.5, -0.5, 0.5},
    55         {-0.5, -0.5, 0.5}
    56     };
    57 
    58     /* Do our drawing, too. */
    59     glClearColor(0.0, 0.0, 0.0, 1.0);
    60     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    61 
    62     glBegin(GL_QUADS);
    63 
    64 #ifdef SHADED_CUBE
    65     glColor3fv(color[0]);
    66     glVertex3fv(cube[0]);
    67     glColor3fv(color[1]);
    68     glVertex3fv(cube[1]);
    69     glColor3fv(color[2]);
    70     glVertex3fv(cube[2]);
    71     glColor3fv(color[3]);
    72     glVertex3fv(cube[3]);
    73 
    74     glColor3fv(color[3]);
    75     glVertex3fv(cube[3]);
    76     glColor3fv(color[4]);
    77     glVertex3fv(cube[4]);
    78     glColor3fv(color[7]);
    79     glVertex3fv(cube[7]);
    80     glColor3fv(color[2]);
    81     glVertex3fv(cube[2]);
    82 
    83     glColor3fv(color[0]);
    84     glVertex3fv(cube[0]);
    85     glColor3fv(color[5]);
    86     glVertex3fv(cube[5]);
    87     glColor3fv(color[6]);
    88     glVertex3fv(cube[6]);
    89     glColor3fv(color[1]);
    90     glVertex3fv(cube[1]);
    91 
    92     glColor3fv(color[5]);
    93     glVertex3fv(cube[5]);
    94     glColor3fv(color[4]);
    95     glVertex3fv(cube[4]);
    96     glColor3fv(color[7]);
    97     glVertex3fv(cube[7]);
    98     glColor3fv(color[6]);
    99     glVertex3fv(cube[6]);
   100 
   101     glColor3fv(color[5]);
   102     glVertex3fv(cube[5]);
   103     glColor3fv(color[0]);
   104     glVertex3fv(cube[0]);
   105     glColor3fv(color[3]);
   106     glVertex3fv(cube[3]);
   107     glColor3fv(color[4]);
   108     glVertex3fv(cube[4]);
   109 
   110     glColor3fv(color[6]);
   111     glVertex3fv(cube[6]);
   112     glColor3fv(color[1]);
   113     glVertex3fv(cube[1]);
   114     glColor3fv(color[2]);
   115     glVertex3fv(cube[2]);
   116     glColor3fv(color[7]);
   117     glVertex3fv(cube[7]);
   118 #else /* flat cube */
   119     glColor3f(1.0, 0.0, 0.0);
   120     glVertex3fv(cube[0]);
   121     glVertex3fv(cube[1]);
   122     glVertex3fv(cube[2]);
   123     glVertex3fv(cube[3]);
   124 
   125     glColor3f(0.0, 1.0, 0.0);
   126     glVertex3fv(cube[3]);
   127     glVertex3fv(cube[4]);
   128     glVertex3fv(cube[7]);
   129     glVertex3fv(cube[2]);
   130 
   131     glColor3f(0.0, 0.0, 1.0);
   132     glVertex3fv(cube[0]);
   133     glVertex3fv(cube[5]);
   134     glVertex3fv(cube[6]);
   135     glVertex3fv(cube[1]);
   136 
   137     glColor3f(0.0, 1.0, 1.0);
   138     glVertex3fv(cube[5]);
   139     glVertex3fv(cube[4]);
   140     glVertex3fv(cube[7]);
   141     glVertex3fv(cube[6]);
   142 
   143     glColor3f(1.0, 1.0, 0.0);
   144     glVertex3fv(cube[5]);
   145     glVertex3fv(cube[0]);
   146     glVertex3fv(cube[3]);
   147     glVertex3fv(cube[4]);
   148 
   149     glColor3f(1.0, 0.0, 1.0);
   150     glVertex3fv(cube[6]);
   151     glVertex3fv(cube[1]);
   152     glVertex3fv(cube[2]);
   153     glVertex3fv(cube[7]);
   154 #endif /* SHADED_CUBE */
   155 
   156     glEnd();
   157 
   158     glMatrixMode(GL_MODELVIEW);
   159     glRotatef(5.0, 1.0, 1.0, 1.0);
   160 }
   161 
   162 int
   163 main(int argc, char *argv[])
   164 {
   165     int fsaa, accel;
   166     int value;
   167     int i, done;
   168     SDL_Event event;
   169     Uint32 then, now, frames;
   170 
   171     /* Initialize parameters */
   172     fsaa = 0;
   173     accel = 0;
   174 
   175     /* Initialize test framework */
   176     state = CommonCreateState(argv, SDL_INIT_VIDEO);
   177     if (!state) {
   178         return 1;
   179     }
   180     for (i = 1; i < argc;) {
   181         int consumed;
   182 
   183         consumed = CommonArg(state, i);
   184         if (consumed == 0) {
   185             if (SDL_strcasecmp(argv[i], "--fsaa") == 0) {
   186                 ++fsaa;
   187                 consumed = 1;
   188             } else if (SDL_strcasecmp(argv[i], "--accel") == 0) {
   189                 ++accel;
   190                 consumed = 1;
   191             } else {
   192                 consumed = -1;
   193             }
   194         }
   195         if (consumed < 0) {
   196             fprintf(stderr, "Usage: %s [--fsaa] [--accel] %s", argv[0],
   197                     CommonUsage(state));
   198             quit(1);
   199         }
   200         i += consumed;
   201     }
   202 
   203     /* Set OpenGL parameters */
   204     state->window_flags |= SDL_WINDOW_OPENGL;
   205     SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
   206     SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
   207     SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
   208     SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
   209     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
   210     if (fsaa) {
   211         SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
   212         SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, fsaa);
   213     }
   214     if (accel) {
   215         SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);
   216     }
   217     if (!CommonInit(state)) {
   218         quit(2);
   219     }
   220 
   221     /* Create OpenGL context */
   222     context = SDL_GL_CreateContext(state->windows[0]);
   223     if (!context) {
   224         fprintf(stderr, "SDL_GL_CreateContext(): %s\n", SDL_GetError());
   225         quit(2);
   226     }
   227     if (SDL_GL_MakeCurrent(state->windows[0], context) < 0) {
   228         fprintf(stderr, "SDL_GL_MakeCurrent(): %s\n", SDL_GetError());
   229         quit(2);
   230     }
   231 
   232     if (state->render_flags & SDL_Renderer_PresentVSync) {
   233         SDL_GL_SetSwapInterval(1);
   234     } else {
   235         SDL_GL_SetSwapInterval(0);
   236     }
   237 
   238     printf("Screen BPP: %d\n",
   239            SDL_BITSPERPIXEL(SDL_GetCurrentDisplayMode()->format));
   240     printf("\n");
   241     printf("Vendor     : %s\n", glGetString(GL_VENDOR));
   242     printf("Renderer   : %s\n", glGetString(GL_RENDERER));
   243     printf("Version    : %s\n", glGetString(GL_VERSION));
   244     printf("Extensions : %s\n", glGetString(GL_EXTENSIONS));
   245     printf("\n");
   246 
   247     SDL_GL_GetWindowAttribute(state->windows[0], SDL_GL_RED_SIZE, &value);
   248     printf("SDL_GL_RED_SIZE: requested %d, got %d\n", 5, value);
   249     SDL_GL_GetWindowAttribute(state->windows[0], SDL_GL_GREEN_SIZE, &value);
   250     printf("SDL_GL_GREEN_SIZE: requested %d, got %d\n", 5, value);
   251     SDL_GL_GetWindowAttribute(state->windows[0], SDL_GL_BLUE_SIZE, &value);
   252     printf("SDL_GL_BLUE_SIZE: requested %d, got %d\n", 5, value);
   253     SDL_GL_GetWindowAttribute(state->windows[0], SDL_GL_DEPTH_SIZE, &value);
   254     printf("SDL_GL_DEPTH_SIZE: requested %d, got %d\n", 16, value);
   255     SDL_GL_GetWindowAttribute(state->windows[0], SDL_GL_DOUBLEBUFFER, &value);
   256     printf("SDL_GL_DOUBLEBUFFER: requested 1, got %d\n", value);
   257     if (fsaa) {
   258         SDL_GL_GetWindowAttribute(state->windows[0],
   259                                   SDL_GL_MULTISAMPLEBUFFERS, &value);
   260         printf("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value);
   261         SDL_GL_GetWindowAttribute(state->windows[0],
   262                                   SDL_GL_MULTISAMPLESAMPLES, &value);
   263         printf("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa,
   264                value);
   265     }
   266     if (accel) {
   267         SDL_GL_GetWindowAttribute(state->windows[0],
   268                                   SDL_GL_ACCELERATED_VISUAL, &value);
   269         printf("SDL_GL_ACCELERATED_VISUAL: requested 1, got %d\n", value);
   270     }
   271 
   272     /* Set rendering settings */
   273     glMatrixMode(GL_PROJECTION);
   274     glLoadIdentity();
   275     glOrtho(-2.0, 2.0, -2.0, 2.0, -20.0, 20.0);
   276     glMatrixMode(GL_MODELVIEW);
   277     glLoadIdentity();
   278     glEnable(GL_DEPTH_TEST);
   279     glDepthFunc(GL_LESS);
   280     glShadeModel(GL_SMOOTH);
   281 
   282     /* Main render loop */
   283     frames = 0;
   284     then = SDL_GetTicks();
   285     done = 0;
   286     while (!done) {
   287         /* Check for events */
   288         ++frames;
   289         while (SDL_PollEvent(&event)) {
   290             CommonEvent(state, &event, &done);
   291         }
   292         for (i = 0; i < state->num_windows; ++i) {
   293             int w, h;
   294             SDL_GL_MakeCurrent(state->windows[i], context);
   295             SDL_GetWindowSize(state->windows[i], &w, &h);
   296             glViewport(0, 0, w, h);
   297             Render();
   298             SDL_GL_SwapWindow(state->windows[i]);
   299         }
   300     }
   301 
   302     /* Print out some timing information */
   303     now = SDL_GetTicks();
   304     if (now > then) {
   305         printf("%2.2f frames per second\n",
   306                ((double) frames * 1000) / (now - then));
   307     }
   308     quit(0);
   309 }
   310 
   311 #else /* HAVE_OPENGL */
   312 
   313 int
   314 main(int argc, char *argv[])
   315 {
   316     printf("No OpenGL support on this system\n");
   317     return 1;
   318 }
   319 
   320 #endif /* HAVE_OPENGL */