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vsync(3alleg4)


NAME

   vsync - Waits for a vertical retrace to begin. Allegro game programming
   library.

SYNOPSIS

   #include <allegro.h>

   void vsync();

DESCRIPTION

   Waits for a vertical retrace to begin. The  retrace  happens  when  the
   electron  beam in your monitor has reached the bottom of the screen and
   is moving back to the top ready for another  scan.  During  this  short
   period  the graphics card isn't sending any data to the monitor, so you
   can do things to it that  aren't  possible  at  other  times,  such  as
   altering  the  palette  without causing flickering (snow). Allegro will
   automatically wait for a retrace before altering the palette  or  doing
   any  hardware  scrolling,  though, so you don't normally need to bother
   with this function.

SEE ALSO

   set_palette(3alleg4), scroll_screen(3alleg4)



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