iOS/libraries/allegro/allegro/src/psp/pgfx.c
/* psp_poll_scroll:
 *  This function is used for triple buffering. It checks the status of
 *  a hardware scroll previously initiated by the request_scroll() or by
 *  the request_video_bitmap() routines. 
 */
This function is used for triple buffering. It checks the status of
a hardware scroll previously initiated by the request_scroll() or by
the request_video_bitmap() routines.
This function is used for triple buffering . It checks the status of a hardware scroll previously initiated by the request_scroll () or by the request_video_bitmap () routines .
static int psp_poll_scroll(void)
{
   int ret;
   if (sceDisplayGetVcount() - vcount_start > 0) {
      vcount_start = 0;
      ret = 0;
   }
   else
      ret = -1;
   return ret;
}
static int psp_poll_scroll ( void ) { int ret ; if ( sceDisplayGetVcount ( ) - vcount_start > 0 ) { vcount_start = 0 ; ret = 0 ; } else ret = -1 ; return ret ; }
psp_poll_scroll:
  This function is used for triple buffering.
psp_poll_scroll : This function is used for triple buffering .
/* A new vertical blank pulse has arrived? */