[SDL] help with SDL_SetVideoMode

[Ryan C. Gordon]

>     printf("1\n");
>     SDL_Rect rect;
>     rect.x=0;
>     rect.y=24;
>     rect.w=22;
>     rect.h=24;
>     SDL_FillRect(screen, &rect, SDL_MapRGB(screen->format,255,0,0));

Don't use SDL_FillRect() on an OpenGL surface. Use gl* functions to
define the contents of the surface.

>     printf("2\n");
>     SDL_UpdateRect(screen, 0,24, 22, 24);

Use SDL_GL_SwapBuffers() instead of SDL_UpdateRect on an OpenGL surface.

--ryan.