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(3alleg), scroll_screen(3alleg)