vsync man page on DragonFly

vsync man page on DragonFly

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vsync(3)			Allegro manual			      vsync(3)

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 alter‐
       ing  the	 palette without causing flickering (snow). Allegro will auto‐
       matically 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(3), scroll_screen(3)

Allegro				 version 4.4.2			      vsync(3)

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