testgl.c

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		y = 0;
		delta_y = -delta_y;
	} else
	if ( (y+h) > screen->h ) {
		y = screen->h-h;
		delta_y = -delta_y;
	}
	dst.x = x;
	dst.y = y;
	dst.w = w;
	dst.h = h;
	SDL_BlitSurface(global_image, NULL, screen, &dst);

	/* Show the image on the screen */
	SDL_UpdateRects(screen, 1, &dst);
}

int RunGLTest( int argc, char* argv[],
               int logo, int slowly, int bpp, float gamma, int noframe )
{
	int i;
	int rgb_size[3];
	int w = 640;
	int h = 480;
	int done = 0;
	int frames;
	Uint32 start_time, this_time;
        float color[8][3]= {{ 1.0,  1.0,  0.0}, 
			    { 1.0,  0.0,  0.0},
			    { 0.0,  0.0,  0.0},
			    { 0.0,  1.0,  0.0},
			    { 0.0,  1.0,  1.0},
			    { 1.0,  1.0,  1.0},
			    { 1.0,  0.0,  1.0},
			    { 0.0,  0.0,  1.0}};
	float cube[8][3]= {{ 0.5,  0.5, -0.5}, 
			   { 0.5, -0.5, -0.5},
			   {-0.5, -0.5, -0.5},
			   {-0.5,  0.5, -0.5},
			   {-0.5,  0.5,  0.5},
			   { 0.5,  0.5,  0.5},
			   { 0.5, -0.5,  0.5},
			   {-0.5, -0.5,  0.5}};
	Uint32 video_flags;
	int value;

	if( SDL_Init( SDL_INIT_VIDEO ) < 0 ) {
		fprintf(stderr,"Couldn't initialize SDL: %s\n",SDL_GetError());
		exit( 1 );
	}

	/* See if we should detect the display depth */
	if ( bpp == 0 ) {
		if ( SDL_GetVideoInfo()->vfmt->BitsPerPixel <= 8 ) {
			bpp = 8;
		} else {
			bpp = 16;  /* More doesn't seem to work */
		}
	}

	/* Set the flags we want to use for setting the video mode */
	if ( logo && USE_DEPRECATED_OPENGLBLIT ) {
		video_flags = SDL_OPENGLBLIT;
	} else {
		video_flags = SDL_OPENGL;
	}
	for ( i=1; argv[i]; ++i ) {
		if ( strcmp(argv[1], "-fullscreen") == 0 ) {
			video_flags |= SDL_FULLSCREEN;
		}
	}

        if (noframe) {
           video_flags |= SDL_NOFRAME;
        }

	/* Initialize the display */
	switch (bpp) {
	    case 8:
		rgb_size[0] = 3;
		rgb_size[1] = 3;
		rgb_size[2] = 2;
		break;
	    case 15:
	    case 16:
		rgb_size[0] = 5;
		rgb_size[1] = 5;
		rgb_size[2] = 5;
		break;
            default:
		rgb_size[0] = 8;
		rgb_size[1] = 8;
		rgb_size[2] = 8;
		break;
	}
	SDL_GL_SetAttribute( SDL_GL_RED_SIZE, rgb_size[0] );
	SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, rgb_size[1] );
	SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, rgb_size[2] );
	SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
	SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
	if ( SDL_SetVideoMode( w, h, bpp, video_flags ) == NULL ) {
		fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError());
		SDL_Quit();
		exit(1);
	}

	printf("Screen BPP: %d\n", SDL_GetVideoSurface()->format->BitsPerPixel);
	printf("\n");
	printf( "Vendor     : %s\n", glGetString( GL_VENDOR ) );
	printf( "Renderer   : %s\n", glGetString( GL_RENDERER ) );
	printf( "Version    : %s\n", glGetString( GL_VERSION ) );
	printf( "Extensions : %s\n", glGetString( GL_EXTENSIONS ) );
	printf("\n");

	SDL_GL_GetAttribute( SDL_GL_RED_SIZE, &value );
	printf( "SDL_GL_RED_SIZE: requested %d, got %d\n", rgb_size[0],value);
	SDL_GL_GetAttribute( SDL_GL_GREEN_SIZE, &value );
	printf( "SDL_GL_GREEN_SIZE: requested %d, got %d\n", rgb_size[1],value);
	SDL_GL_GetAttribute( SDL_GL_BLUE_SIZE, &value );
	printf( "SDL_GL_BLUE_SIZE: requested %d, got %d\n", rgb_size[2],value);
	SDL_GL_GetAttribute( SDL_GL_DEPTH_SIZE, &value );
	printf( "SDL_GL_DEPTH_SIZE: requested %d, got %d\n", bpp, value );
	SDL_GL_GetAttribute( SDL_GL_DOUBLEBUFFER, &value );
	printf( "SDL_GL_DOUBLEBUFFER: requested 1, got %d\n", value );

	/* Set the window manager title bar */
	SDL_WM_SetCaption( "SDL GL test", "testgl" );

	/* Set the gamma for the window */
	if ( gamma != 0.0 ) {
		SDL_SetGamma(gamma, gamma, gamma);
	}

	glViewport( 0, 0, w, h );
	glMatrixMode( GL_PROJECTION );
	glLoadIdentity( );

	glOrtho( -2.0, 2.0, -2.0, 2.0, -20.0, 20.0 );

	glMatrixMode( GL_MODELVIEW );
	glLoadIdentity( );

	glEnable(GL_DEPTH_TEST);

	glDepthFunc(GL_LESS);

	glShadeModel(GL_SMOOTH);

	/* Loop until done. */
	start_time = SDL_GetTicks();
	frames = 0;
	while( !done ) {
		GLenum gl_error;
		char* sdl_error;
		SDL_Event event;

		/* Do our drawing, too. */
		glClearColor( 0.0, 0.0, 0.0, 1.0 );
		glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

		glBegin( GL_QUADS );

#ifdef SHADED_CUBE
			glColor3fv(color[0]);
			glVertex3fv(cube[0]);
			glColor3fv(color[1]);
			glVertex3fv(cube[1]);
			glColor3fv(color[2]);
			glVertex3fv(cube[2]);
			glColor3fv(color[3]);
			glVertex3fv(cube[3]);
			
			glColor3fv(color[3]);
			glVertex3fv(cube[3]);
			glColor3fv(color[4]);
			glVertex3fv(cube[4]);
			glColor3fv(color[7]);
			glVertex3fv(cube[7]);
			glColor3fv(color[2]);
			glVertex3fv(cube[2]);
			
			glColor3fv(color[0]);
			glVertex3fv(cube[0]);
			glColor3fv(color[5]);
			glVertex3fv(cube[5]);
			glColor3fv(color[6]);
			glVertex3fv(cube[6]);
			glColor3fv(color[1]);
			glVertex3fv(cube[1]);
			
			glColor3fv(color[5]);
			glVertex3fv(cube[5]);
			glColor3fv(color[4]);
			glVertex3fv(cube[4]);
			glColor3fv(color[7]);
			glVertex3fv(cube[7]);
			glColor3fv(color[6]);
			glVertex3fv(cube[6]);

			glColor3fv(color[5]);
			glVertex3fv(cube[5]);
			glColor3fv(color[0]);
			glVertex3fv(cube[0]);
			glColor3fv(color[3]);
			glVertex3fv(cube[3]);
			glColor3fv(color[4]);
			glVertex3fv(cube[4]);

			glColor3fv(color[6]);
			glVertex3fv(cube[6]);
			glColor3fv(color[1]);
			glVertex3fv(cube[1]);
			glColor3fv(color[2]);
			glVertex3fv(cube[2]);
			glColor3fv(color[7]);
			glVertex3fv(cube[7]);
#else // flat cube
			glColor3f(1.0, 0.0, 0.0);
			glVertex3fv(cube[0]);
			glVertex3fv(cube[1]);
			glVertex3fv(cube[2]);
			glVertex3fv(cube[3]);
			
			glColor3f(0.0, 1.0, 0.0);
			glVertex3fv(cube[3]);
			glVertex3fv(cube[4]);
			glVertex3fv(cube[7]);
			glVertex3fv(cube[2]);
			
			glColor3f(0.0, 0.0, 1.0);
			glVertex3fv(cube[0]);
			glVertex3fv(cube[5]);
			glVertex3fv(cube[6]);
			glVertex3fv(cube[1]);
			
			glColor3f(0.0, 1.0, 1.0);
			glVertex3fv(cube[5]);
			glVertex3fv(cube[4]);
			glVertex3fv(cube[7]);
			glVertex3fv(cube[6]);

			glColor3f(1.0, 1.0, 0.0);
			glVertex3fv(cube[5]);
			glVertex3fv(cube[0]);
			glVertex3fv(cube[3]);
			glVertex3fv(cube[4]);

			glColor3f(1.0, 0.0, 1.0);
			glVertex3fv(cube[6]);
			glVertex3fv(cube[1]);
			glVertex3fv(cube[2]);
			glVertex3fv(cube[7]);
#endif /* SHADED_CUBE */

		glEnd( );
		
		glMatrixMode(GL_MODELVIEW);
		glRotatef(5.0, 1.0, 1.0, 1.0);

		/* Draw 2D logo onto the 3D display */
		if ( logo ) {
			if ( USE_DEPRECATED_OPENGLBLIT ) {
				DrawLogoBlit();
			} else {
				DrawLogoTexture();
			}
		}

		SDL_GL_SwapBuffers( );

		/* Check for error conditions. */
		gl_error = glGetError( );

		if( gl_error != GL_NO_ERROR ) {
			fprintf( stderr, "testgl: OpenGL error: %d\n", gl_error );
		}

		sdl_error = SDL_GetError( );

		if( sdl_error[0] != '\0' ) {
			fprintf(stderr, "testgl: SDL error '%s'\n", sdl_error);
			SDL_ClearError();
		}

		/* Allow the user to see what's happening */
		if ( slowly ) {
			SDL_Delay( 20 );
		}

		/* Check if there's a pending event. */
		while( SDL_PollEvent( &event ) ) {
			done = HandleEvent(&event);
		}
		++frames;
	}

	/* Print out the frames per second */
	this_time = SDL_GetTicks();
	if ( this_time != start_time ) {
		printf("%2.2f FPS\n",
			((float)frames/(this_time-start_time))*1000.0);
	}

	if ( global_image ) {
	   	SDL_FreeSurface(global_image);
		global_image = NULL;
	}
	if ( global_texture ) {
		glDeleteTextures( 1, &global_texture );
		global_texture = 0;
	}

	/* Destroy our GL context, etc. */
	SDL_Quit( );
	return(0);
}

int main(int argc, char *argv[])
{
	int i, logo;
	int numtests;
	int bpp = 0;
	int slowly;
	float gamma = 0.0;
	int noframe = 0;

	logo = 0;
	slowly = 0;
	numtests = 1;
	for ( i=1; argv[i]; ++i ) {
		if ( strcmp(argv[i], "-twice") == 0 ) {
			++numtests;
		}
		if ( strcmp(argv[i], "-logo") == 0 ) {
			logo = 1;
			USE_DEPRECATED_OPENGLBLIT = SDL_FALSE;
		}
		if ( strcmp(argv[i], "-logoblit") == 0 ) {
			logo = 1;
			USE_DEPRECATED_OPENGLBLIT = SDL_TRUE;
		}
		if ( strcmp(argv[i], "-slow") == 0 ) {
			slowly = 1;
		}
		if ( strcmp(argv[i], "-bpp") == 0 ) {
 		       bpp = atoi(argv[++i]);
		}
		if ( strcmp(argv[i], "-gamma") == 0 ) {
 		       gamma = (float)atof(argv[++i]);
		}
		if ( strcmp(argv[i], "-noframe") == 0 ) {
 		       noframe = 1;
		}
		if ( strncmp(argv[i], "-h", 2) == 0 ) {
 		       printf(
"Usage: %s [-twice] [-logo] [-slow] [-bpp n] [-gamma n] [-noframe]\n",
 			      argv[0]);
			exit(0);
		}
	}
	for ( i=0; i<numtests; ++i ) {
 		RunGLTest(argc, argv, logo, slowly, bpp, gamma, noframe);
	}
	return 0;
}

#else /* HAVE_OPENGL */

int main(int argc, char *argv[])
{
	printf("No OpenGL support on this system\n");
	return 1;
}

#endif /* HAVE_OPENGL */