Provided by: allegro4-doc_4.4.2-13_all bug

NAME

       request_scroll  -  Queues  a  hardware  scroll request with triple buffering. Allegro game
       programming library.

SYNOPSIS

       #include <allegro.h>

       int request_scroll(int x, int y);

DESCRIPTION

       This function is used for triple buffering. It requests a hardware scroll to the specified
       position,  but returns immediately rather than waiting for a retrace. The scroll will then
       take place during the next vertical retrace, but you can carry on running  other  code  in
       the  meantime and use the poll_scroll() routine to detect when the flip has actually taken
       place.

       Triple  buffering  is  only  possible  with  certain  drivers:  you  can   look   at   the
       GFX_CAN_TRIPLE_BUFFER  bit  in  the  gfx_capabilities flag to see if it will work with the
       current driver.

RETURN VALUE

       This function returns zero on success, non-zero otherwise.

SEE ALSO

       poll_scroll(3alleg4),      request_video_bitmap(3alleg4),       gfx_capabilities(3alleg4),
       scroll_screen(3alleg4)