test/testgl.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 10 Jul 2006 21:04:37 +0000
changeset 1895 c121d94672cb
parent 1880 9d940db55a91
child 1912 8d384b647307
permissions -rw-r--r--
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
     1 #include <stdlib.h>
     2 #include <stdio.h>
     3 #include <string.h>
     4 #include <math.h>
     5 
     6 #include "SDL.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 /* Define this to be the name of the logo image to use with -logo */
    20 #define LOGO_FILE	"icon.bmp"
    21 
    22 static SDL_Surface *global_image = NULL;
    23 static GLuint global_texture = 0;
    24 static GLuint cursor_texture = 0;
    25 
    26 /**********************************************************************/
    27 
    28 void
    29 HotKey_ToggleFullScreen(void)
    30 {
    31     SDL_Surface *screen;
    32 
    33     screen = SDL_GetVideoSurface();
    34     if (SDL_WM_ToggleFullScreen(screen)) {
    35         printf("Toggled fullscreen mode - now %s\n",
    36                (screen->flags & SDL_FULLSCREEN) ? "fullscreen" : "windowed");
    37     } else {
    38         printf("Unable to toggle fullscreen mode\n");
    39     }
    40 }
    41 
    42 void
    43 HotKey_ToggleGrab(void)
    44 {
    45     SDL_GrabMode mode;
    46 
    47     printf("Ctrl-G: toggling input grab!\n");
    48     mode = SDL_WM_GrabInput(SDL_GRAB_QUERY);
    49     if (mode == SDL_GRAB_ON) {
    50         printf("Grab was on\n");
    51     } else {
    52         printf("Grab was off\n");
    53     }
    54     mode = SDL_WM_GrabInput(!mode);
    55     if (mode == SDL_GRAB_ON) {
    56         printf("Grab is now on\n");
    57     } else {
    58         printf("Grab is now off\n");
    59     }
    60 }
    61 
    62 void
    63 HotKey_Iconify(void)
    64 {
    65     printf("Ctrl-Z: iconifying window!\n");
    66     SDL_WM_IconifyWindow();
    67 }
    68 
    69 int
    70 HandleEvent(SDL_Event * event)
    71 {
    72     int done;
    73 
    74     done = 0;
    75     switch (event->type) {
    76     case SDL_ACTIVEEVENT:
    77         /* See what happened */
    78         printf("app %s ", event->active.gain ? "gained" : "lost");
    79         if (event->active.state & SDL_APPACTIVE) {
    80             printf("active ");
    81         } else if (event->active.state & SDL_APPMOUSEFOCUS) {
    82             printf("mouse ");
    83         } else if (event->active.state & SDL_APPINPUTFOCUS) {
    84             printf("input ");
    85         }
    86         printf("focus\n");
    87         break;
    88 
    89 
    90     case SDL_KEYDOWN:
    91         if (event->key.keysym.sym == SDLK_ESCAPE) {
    92             done = 1;
    93         }
    94         if ((event->key.keysym.sym == SDLK_g) &&
    95             (event->key.keysym.mod & KMOD_CTRL)) {
    96             HotKey_ToggleGrab();
    97         }
    98         if ((event->key.keysym.sym == SDLK_z) &&
    99             (event->key.keysym.mod & KMOD_CTRL)) {
   100             HotKey_Iconify();
   101         }
   102         if ((event->key.keysym.sym == SDLK_RETURN) &&
   103             (event->key.keysym.mod & KMOD_ALT)) {
   104             HotKey_ToggleFullScreen();
   105         }
   106         printf("key '%s' pressed\n", SDL_GetKeyName(event->key.keysym.sym));
   107         break;
   108     case SDL_QUIT:
   109         done = 1;
   110         break;
   111     }
   112     return (done);
   113 }
   114 
   115 void
   116 SDL_GL_Enter2DMode()
   117 {
   118     SDL_Surface *screen = SDL_GetVideoSurface();
   119 
   120     /* Note, there may be other things you need to change,
   121        depending on how you have your OpenGL state set up.
   122      */
   123     glPushAttrib(GL_ENABLE_BIT);
   124     glDisable(GL_DEPTH_TEST);
   125     glDisable(GL_CULL_FACE);
   126     glEnable(GL_TEXTURE_2D);
   127 
   128     /* This allows alpha blending of 2D textures with the scene */
   129     glEnable(GL_BLEND);
   130     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   131 
   132     glViewport(0, 0, screen->w, screen->h);
   133 
   134     glMatrixMode(GL_PROJECTION);
   135     glPushMatrix();
   136     glLoadIdentity();
   137 
   138     glOrtho(0.0, (GLdouble) screen->w, (GLdouble) screen->h, 0.0, 0.0, 1.0);
   139 
   140     glMatrixMode(GL_MODELVIEW);
   141     glPushMatrix();
   142     glLoadIdentity();
   143 
   144     glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
   145 }
   146 
   147 void
   148 SDL_GL_Leave2DMode()
   149 {
   150     glMatrixMode(GL_MODELVIEW);
   151     glPopMatrix();
   152 
   153     glMatrixMode(GL_PROJECTION);
   154     glPopMatrix();
   155 
   156     glPopAttrib();
   157 }
   158 
   159 /* Quick utility function for texture creation */
   160 static int
   161 power_of_two(int input)
   162 {
   163     int value = 1;
   164 
   165     while (value < input) {
   166         value <<= 1;
   167     }
   168     return value;
   169 }
   170 
   171 GLuint
   172 SDL_GL_LoadTexture(SDL_Surface * surface, GLfloat * texcoord)
   173 {
   174     GLuint texture;
   175     int w, h;
   176     SDL_Surface *image;
   177     SDL_Rect area;
   178     Uint32 saved_flags;
   179     Uint8 saved_alpha;
   180 
   181     /* Use the surface width and height expanded to powers of 2 */
   182     w = power_of_two(surface->w);
   183     h = power_of_two(surface->h);
   184     texcoord[0] = 0.0f;         /* Min X */
   185     texcoord[1] = 0.0f;         /* Min Y */
   186     texcoord[2] = (GLfloat) surface->w / w;     /* Max X */
   187     texcoord[3] = (GLfloat) surface->h / h;     /* Max Y */
   188 
   189     image = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 32,
   190 #if SDL_BYTEORDER == SDL_LIL_ENDIAN     /* OpenGL RGBA masks */
   191                                  0x000000FF,
   192                                  0x0000FF00, 0x00FF0000, 0xFF000000
   193 #else
   194                                  0xFF000000,
   195                                  0x00FF0000, 0x0000FF00, 0x000000FF
   196 #endif
   197         );
   198     if (image == NULL) {
   199         return 0;
   200     }
   201 
   202     /* Save the alpha blending attributes */
   203     saved_flags = surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK);
   204     saved_alpha = surface->format->alpha;
   205     if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA) {
   206         SDL_SetAlpha(surface, 0, 0);
   207     }
   208 
   209     /* Copy the surface into the GL texture image */
   210     area.x = 0;
   211     area.y = 0;
   212     area.w = surface->w;
   213     area.h = surface->h;
   214     SDL_BlitSurface(surface, &area, image, &area);
   215 
   216     /* Restore the alpha blending attributes */
   217     if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA) {
   218         SDL_SetAlpha(surface, saved_flags, saved_alpha);
   219     }
   220 
   221     /* Create an OpenGL texture for the image */
   222     glGenTextures(1, &texture);
   223     glBindTexture(GL_TEXTURE_2D, texture);
   224     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   225     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
   226     glTexImage2D(GL_TEXTURE_2D,
   227                  0,
   228                  GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
   229     SDL_FreeSurface(image);     /* No longer needed */
   230 
   231     return texture;
   232 }
   233 
   234 void
   235 DrawLogoCursor(void)
   236 {
   237     static GLfloat texMinX, texMinY;
   238     static GLfloat texMaxX, texMaxY;
   239     static int w, h;
   240     int x, y;
   241 
   242     if (!cursor_texture) {
   243         SDL_Surface *image;
   244         GLfloat texcoord[4];
   245 
   246         /* Load the image (could use SDL_image library here) */
   247         image = SDL_LoadBMP(LOGO_FILE);
   248         if (image == NULL) {
   249             return;
   250         }
   251         w = image->w;
   252         h = image->h;
   253 
   254         /* Convert the image into an OpenGL texture */
   255         cursor_texture = SDL_GL_LoadTexture(image, texcoord);
   256 
   257         /* Make texture coordinates easy to understand */
   258         texMinX = texcoord[0];
   259         texMinY = texcoord[1];
   260         texMaxX = texcoord[2];
   261         texMaxY = texcoord[3];
   262 
   263         /* We don't need the original image anymore */
   264         SDL_FreeSurface(image);
   265 
   266         /* Make sure that the texture conversion is okay */
   267         if (!cursor_texture) {
   268             return;
   269         }
   270     }
   271 
   272     /* Move the image around */
   273     SDL_GetMouseState(&x, &y);
   274     x -= w / 2;
   275     y -= h / 2;
   276 
   277     /* Show the image on the screen */
   278     SDL_GL_Enter2DMode();
   279     glBindTexture(GL_TEXTURE_2D, cursor_texture);
   280     glBegin(GL_TRIANGLE_STRIP);
   281     glTexCoord2f(texMinX, texMinY);
   282     glVertex2i(x, y);
   283     glTexCoord2f(texMaxX, texMinY);
   284     glVertex2i(x + w, y);
   285     glTexCoord2f(texMinX, texMaxY);
   286     glVertex2i(x, y + h);
   287     glTexCoord2f(texMaxX, texMaxY);
   288     glVertex2i(x + w, y + h);
   289     glEnd();
   290     SDL_GL_Leave2DMode();
   291 }
   292 
   293 void
   294 DrawLogoTexture(void)
   295 {
   296     static GLfloat texMinX, texMinY;
   297     static GLfloat texMaxX, texMaxY;
   298     static int x = 0;
   299     static int y = 0;
   300     static int w, h;
   301     static int delta_x = 1;
   302     static int delta_y = 1;
   303 
   304     SDL_Surface *screen = SDL_GetVideoSurface();
   305 
   306     if (!global_texture) {
   307         SDL_Surface *image;
   308         GLfloat texcoord[4];
   309 
   310         /* Load the image (could use SDL_image library here) */
   311         image = SDL_LoadBMP(LOGO_FILE);
   312         if (image == NULL) {
   313             return;
   314         }
   315         w = image->w;
   316         h = image->h;
   317 
   318         /* Convert the image into an OpenGL texture */
   319         global_texture = SDL_GL_LoadTexture(image, texcoord);
   320 
   321         /* Make texture coordinates easy to understand */
   322         texMinX = texcoord[0];
   323         texMinY = texcoord[1];
   324         texMaxX = texcoord[2];
   325         texMaxY = texcoord[3];
   326 
   327         /* We don't need the original image anymore */
   328         SDL_FreeSurface(image);
   329 
   330         /* Make sure that the texture conversion is okay */
   331         if (!global_texture) {
   332             return;
   333         }
   334     }
   335 
   336     /* Move the image around */
   337     x += delta_x;
   338     if (x < 0) {
   339         x = 0;
   340         delta_x = -delta_x;
   341     } else if ((x + w) > screen->w) {
   342         x = screen->w - w;
   343         delta_x = -delta_x;
   344     }
   345     y += delta_y;
   346     if (y < 0) {
   347         y = 0;
   348         delta_y = -delta_y;
   349     } else if ((y + h) > screen->h) {
   350         y = screen->h - h;
   351         delta_y = -delta_y;
   352     }
   353 
   354     /* Show the image on the screen */
   355     SDL_GL_Enter2DMode();
   356     glBindTexture(GL_TEXTURE_2D, global_texture);
   357     glBegin(GL_TRIANGLE_STRIP);
   358     glTexCoord2f(texMinX, texMinY);
   359     glVertex2i(x, y);
   360     glTexCoord2f(texMaxX, texMinY);
   361     glVertex2i(x + w, y);
   362     glTexCoord2f(texMinX, texMaxY);
   363     glVertex2i(x, y + h);
   364     glTexCoord2f(texMaxX, texMaxY);
   365     glVertex2i(x + w, y + h);
   366     glEnd();
   367     SDL_GL_Leave2DMode();
   368 }
   369 
   370 int
   371 RunGLTest(int argc, char *argv[],
   372           int logo, int logocursor, int slowly, int bpp, float gamma,
   373           int noframe, int fsaa, int sync, int accel)
   374 {
   375     int i;
   376     int rgb_size[3];
   377     int w = 640;
   378     int h = 480;
   379     int done = 0;
   380     int frames;
   381     Uint32 start_time, this_time;
   382     float color[8][3] = { {1.0, 1.0, 0.0},
   383     {1.0, 0.0, 0.0},
   384     {0.0, 0.0, 0.0},
   385     {0.0, 1.0, 0.0},
   386     {0.0, 1.0, 1.0},
   387     {1.0, 1.0, 1.0},
   388     {1.0, 0.0, 1.0},
   389     {0.0, 0.0, 1.0}
   390     };
   391     float cube[8][3] = { {0.5, 0.5, -0.5},
   392     {0.5, -0.5, -0.5},
   393     {-0.5, -0.5, -0.5},
   394     {-0.5, 0.5, -0.5},
   395     {-0.5, 0.5, 0.5},
   396     {0.5, 0.5, 0.5},
   397     {0.5, -0.5, 0.5},
   398     {-0.5, -0.5, 0.5}
   399     };
   400     Uint32 video_flags;
   401     int value;
   402 
   403     if (SDL_Init(SDL_INIT_VIDEO) < 0) {
   404         fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
   405         exit(1);
   406     }
   407 
   408     /* See if we should detect the display depth */
   409     if (bpp == 0) {
   410         if (SDL_GetVideoInfo()->vfmt->BitsPerPixel <= 8) {
   411             bpp = 8;
   412         } else {
   413             bpp = 16;           /* More doesn't seem to work */
   414         }
   415     }
   416 
   417     /* Set the flags we want to use for setting the video mode */
   418     video_flags = SDL_OPENGL;
   419     for (i = 1; argv[i]; ++i) {
   420         if (strcmp(argv[i], "-fullscreen") == 0) {
   421             video_flags |= SDL_FULLSCREEN;
   422         }
   423     }
   424 
   425     if (noframe) {
   426         video_flags |= SDL_NOFRAME;
   427     }
   428 
   429     /* Initialize the display */
   430     switch (bpp) {
   431     case 8:
   432         rgb_size[0] = 3;
   433         rgb_size[1] = 3;
   434         rgb_size[2] = 2;
   435         break;
   436     case 15:
   437     case 16:
   438         rgb_size[0] = 5;
   439         rgb_size[1] = 5;
   440         rgb_size[2] = 5;
   441         break;
   442     default:
   443         rgb_size[0] = 8;
   444         rgb_size[1] = 8;
   445         rgb_size[2] = 8;
   446         break;
   447     }
   448     SDL_GL_SetAttribute(SDL_GL_RED_SIZE, rgb_size[0]);
   449     SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, rgb_size[1]);
   450     SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, rgb_size[2]);
   451     SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
   452     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
   453     if (fsaa) {
   454         SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
   455         SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, fsaa);
   456     }
   457     if (accel) {
   458         SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);
   459     }
   460     if (sync) {
   461         SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 1);
   462     } else {
   463         SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 0);
   464     }
   465     if (SDL_SetVideoMode(w, h, bpp, video_flags) == NULL) {
   466         fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError());
   467         SDL_Quit();
   468         exit(1);
   469     }
   470 
   471     printf("Screen BPP: %d\n", SDL_GetVideoSurface()->format->BitsPerPixel);
   472     printf("\n");
   473     printf("Vendor     : %s\n", glGetString(GL_VENDOR));
   474     printf("Renderer   : %s\n", glGetString(GL_RENDERER));
   475     printf("Version    : %s\n", glGetString(GL_VERSION));
   476     printf("Extensions : %s\n", glGetString(GL_EXTENSIONS));
   477     printf("\n");
   478 
   479     SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &value);
   480     printf("SDL_GL_RED_SIZE: requested %d, got %d\n", rgb_size[0], value);
   481     SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &value);
   482     printf("SDL_GL_GREEN_SIZE: requested %d, got %d\n", rgb_size[1], value);
   483     SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &value);
   484     printf("SDL_GL_BLUE_SIZE: requested %d, got %d\n", rgb_size[2], value);
   485     SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &value);
   486     printf("SDL_GL_DEPTH_SIZE: requested %d, got %d\n", bpp, value);
   487     SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &value);
   488     printf("SDL_GL_DOUBLEBUFFER: requested 1, got %d\n", value);
   489     if (fsaa) {
   490         SDL_GL_GetAttribute(SDL_GL_MULTISAMPLEBUFFERS, &value);
   491         printf("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value);
   492         SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &value);
   493         printf("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa,
   494                value);
   495     }
   496     if (accel) {
   497         SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &value);
   498         printf("SDL_GL_ACCELERATED_VISUAL: requested 1, got %d\n", value);
   499     }
   500     if (sync) {
   501         SDL_GL_GetAttribute(SDL_GL_SWAP_CONTROL, &value);
   502         printf("SDL_GL_SWAP_CONTROL: requested 1, got %d\n", value);
   503     }
   504 
   505     /* Set the window manager title bar */
   506     SDL_WM_SetCaption("SDL GL test", "testgl");
   507 
   508     /* Set the gamma for the window */
   509     if (gamma != 0.0) {
   510         SDL_SetGamma(gamma, gamma, gamma);
   511     }
   512 
   513     glViewport(0, 0, w, h);
   514     glMatrixMode(GL_PROJECTION);
   515     glLoadIdentity();
   516 
   517     glOrtho(-2.0, 2.0, -2.0, 2.0, -20.0, 20.0);
   518 
   519     glMatrixMode(GL_MODELVIEW);
   520     glLoadIdentity();
   521 
   522     glEnable(GL_DEPTH_TEST);
   523 
   524     glDepthFunc(GL_LESS);
   525 
   526     glShadeModel(GL_SMOOTH);
   527 
   528     /* Loop until done. */
   529     start_time = SDL_GetTicks();
   530     frames = 0;
   531     while (!done) {
   532         GLenum gl_error;
   533         char *sdl_error;
   534         SDL_Event event;
   535 
   536         /* Do our drawing, too. */
   537         glClearColor(0.0, 0.0, 0.0, 1.0);
   538         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
   539 
   540         glBegin(GL_QUADS);
   541 
   542 #ifdef SHADED_CUBE
   543         glColor3fv(color[0]);
   544         glVertex3fv(cube[0]);
   545         glColor3fv(color[1]);
   546         glVertex3fv(cube[1]);
   547         glColor3fv(color[2]);
   548         glVertex3fv(cube[2]);
   549         glColor3fv(color[3]);
   550         glVertex3fv(cube[3]);
   551 
   552         glColor3fv(color[3]);
   553         glVertex3fv(cube[3]);
   554         glColor3fv(color[4]);
   555         glVertex3fv(cube[4]);
   556         glColor3fv(color[7]);
   557         glVertex3fv(cube[7]);
   558         glColor3fv(color[2]);
   559         glVertex3fv(cube[2]);
   560 
   561         glColor3fv(color[0]);
   562         glVertex3fv(cube[0]);
   563         glColor3fv(color[5]);
   564         glVertex3fv(cube[5]);
   565         glColor3fv(color[6]);
   566         glVertex3fv(cube[6]);
   567         glColor3fv(color[1]);
   568         glVertex3fv(cube[1]);
   569 
   570         glColor3fv(color[5]);
   571         glVertex3fv(cube[5]);
   572         glColor3fv(color[4]);
   573         glVertex3fv(cube[4]);
   574         glColor3fv(color[7]);
   575         glVertex3fv(cube[7]);
   576         glColor3fv(color[6]);
   577         glVertex3fv(cube[6]);
   578 
   579         glColor3fv(color[5]);
   580         glVertex3fv(cube[5]);
   581         glColor3fv(color[0]);
   582         glVertex3fv(cube[0]);
   583         glColor3fv(color[3]);
   584         glVertex3fv(cube[3]);
   585         glColor3fv(color[4]);
   586         glVertex3fv(cube[4]);
   587 
   588         glColor3fv(color[6]);
   589         glVertex3fv(cube[6]);
   590         glColor3fv(color[1]);
   591         glVertex3fv(cube[1]);
   592         glColor3fv(color[2]);
   593         glVertex3fv(cube[2]);
   594         glColor3fv(color[7]);
   595         glVertex3fv(cube[7]);
   596 #else /* flat cube */
   597         glColor3f(1.0, 0.0, 0.0);
   598         glVertex3fv(cube[0]);
   599         glVertex3fv(cube[1]);
   600         glVertex3fv(cube[2]);
   601         glVertex3fv(cube[3]);
   602 
   603         glColor3f(0.0, 1.0, 0.0);
   604         glVertex3fv(cube[3]);
   605         glVertex3fv(cube[4]);
   606         glVertex3fv(cube[7]);
   607         glVertex3fv(cube[2]);
   608 
   609         glColor3f(0.0, 0.0, 1.0);
   610         glVertex3fv(cube[0]);
   611         glVertex3fv(cube[5]);
   612         glVertex3fv(cube[6]);
   613         glVertex3fv(cube[1]);
   614 
   615         glColor3f(0.0, 1.0, 1.0);
   616         glVertex3fv(cube[5]);
   617         glVertex3fv(cube[4]);
   618         glVertex3fv(cube[7]);
   619         glVertex3fv(cube[6]);
   620 
   621         glColor3f(1.0, 1.0, 0.0);
   622         glVertex3fv(cube[5]);
   623         glVertex3fv(cube[0]);
   624         glVertex3fv(cube[3]);
   625         glVertex3fv(cube[4]);
   626 
   627         glColor3f(1.0, 0.0, 1.0);
   628         glVertex3fv(cube[6]);
   629         glVertex3fv(cube[1]);
   630         glVertex3fv(cube[2]);
   631         glVertex3fv(cube[7]);
   632 #endif /* SHADED_CUBE */
   633 
   634         glEnd();
   635 
   636         glMatrixMode(GL_MODELVIEW);
   637         glRotatef(5.0, 1.0, 1.0, 1.0);
   638 
   639         /* Draw 2D logo onto the 3D display */
   640         if (logo) {
   641             DrawLogoTexture();
   642         }
   643         if (logocursor) {
   644             DrawLogoCursor();
   645         }
   646 
   647         SDL_GL_SwapBuffers();
   648 
   649         /* Check for error conditions. */
   650         gl_error = glGetError();
   651 
   652         if (gl_error != GL_NO_ERROR) {
   653             fprintf(stderr, "testgl: OpenGL error: %d\n", gl_error);
   654         }
   655 
   656         sdl_error = SDL_GetError();
   657 
   658         if (sdl_error[0] != '\0') {
   659             fprintf(stderr, "testgl: SDL error '%s'\n", sdl_error);
   660             SDL_ClearError();
   661         }
   662 
   663         /* Allow the user to see what's happening */
   664         if (slowly) {
   665             SDL_Delay(20);
   666         }
   667 
   668         /* Check if there's a pending event. */
   669         while (SDL_PollEvent(&event)) {
   670             done = HandleEvent(&event);
   671         }
   672         ++frames;
   673     }
   674 
   675     /* Print out the frames per second */
   676     this_time = SDL_GetTicks();
   677     if (this_time != start_time) {
   678         printf("%2.2f FPS\n",
   679                ((float) frames / (this_time - start_time)) * 1000.0);
   680     }
   681 
   682     if (global_image) {
   683         SDL_FreeSurface(global_image);
   684         global_image = NULL;
   685     }
   686     if (global_texture) {
   687         glDeleteTextures(1, &global_texture);
   688         global_texture = 0;
   689     }
   690     if (cursor_texture) {
   691         glDeleteTextures(1, &cursor_texture);
   692         cursor_texture = 0;
   693     }
   694 
   695     /* Destroy our GL context, etc. */
   696     SDL_Quit();
   697     return (0);
   698 }
   699 
   700 int
   701 main(int argc, char *argv[])
   702 {
   703     int i, logo, logocursor = 0;
   704     int numtests;
   705     int bpp = 0;
   706     int slowly;
   707     float gamma = 0.0;
   708     int noframe = 0;
   709     int fsaa = 0;
   710     int accel = 0;
   711     int sync = 0;
   712 
   713     logo = 0;
   714     slowly = 0;
   715     numtests = 1;
   716     for (i = 1; argv[i]; ++i) {
   717         if (strcmp(argv[i], "-twice") == 0) {
   718             ++numtests;
   719         }
   720         if (strcmp(argv[i], "-logo") == 0) {
   721             logo = 1;
   722         }
   723         if (strcmp(argv[i], "-logocursor") == 0) {
   724             logocursor = 1;
   725         }
   726         if (strcmp(argv[i], "-slow") == 0) {
   727             slowly = 1;
   728         }
   729         if (strcmp(argv[i], "-bpp") == 0) {
   730             bpp = atoi(argv[++i]);
   731         }
   732         if (strcmp(argv[i], "-gamma") == 0) {
   733             gamma = (float) atof(argv[++i]);
   734         }
   735         if (strcmp(argv[i], "-noframe") == 0) {
   736             noframe = 1;
   737         }
   738         if (strcmp(argv[i], "-fsaa") == 0) {
   739             ++fsaa;
   740         }
   741         if (strcmp(argv[i], "-accel") == 0) {
   742             ++accel;
   743         }
   744         if (strcmp(argv[i], "-sync") == 0) {
   745             ++sync;
   746         }
   747         if (strncmp(argv[i], "-h", 2) == 0) {
   748             printf
   749                 ("Usage: %s [-twice] [-logo] [-logocursor] [-slow] [-bpp n] [-gamma n] [-noframe] [-fsaa] [-accel] [-sync] [-fullscreen]\n",
   750                  argv[0]);
   751             exit(0);
   752         }
   753     }
   754     for (i = 0; i < numtests; ++i) {
   755         RunGLTest(argc, argv, logo, logocursor, slowly, bpp, gamma,
   756                   noframe, fsaa, sync, accel);
   757     }
   758     return 0;
   759 }
   760 
   761 #else /* HAVE_OPENGL */
   762 
   763 int
   764 main(int argc, char *argv[])
   765 {
   766     printf("No OpenGL support on this system\n");
   767     return 1;
   768 }
   769 
   770 #endif /* HAVE_OPENGL */