1vsync(3)                        Allegro manual                        vsync(3)
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NAME

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

10       #include <allegro.h>
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13       void vsync();
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DESCRIPTION

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

30       set_palette(3), scroll_screen(3)
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34Allegro                          version 4.4.2                        vsync(3)
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