/*  call-seq:
 *    swap_buffers( )  ->  nil
 *
 *  Swap the back and front buffers, for double-buffered OpenGL displays.
 *  Should be safe to use (albeit with no effect) on single-buffered OpenGL 
 *  displays.
 */
VALUE rbgm_gl_swapbuffers(VALUE module)
{
  SDL_GL_SwapBuffers();
  return Qnil;
}