From:	Tom St Denis <stdenis AT compmore DOT net>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Nasty, nasty graphic flicker
Date:	Thu, 01 Feb 2001 12:27:18 GMT
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In article <3a78f002_1 AT corp DOT newsfeeds DOT com>,
  "23yrold3yrold" <cbarry AT pangea DOT ca> wrote:
> Hello. I have a simple question; how is it that a simple command to blit to
> the screen from a grabber datafile can cause random flickering of the image
> all over the screen? It only happens half the time, first use of the bitmap.
> Occasionally the program just crashes. Does anyone have any idea what might
> cause this? And before you ask for code snippiets, I assure you they're
> normal, plain vanilla draw_sprite function calls.

Flickering normally happens because you are drawing during the vertical sync.

Try doing this

do {
   vsync();
   // draw stuff
} while (!done);

Tom


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