From: temujin <temujin AT sentex DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Allegro and blitting to screen
Date: Sat, 18 Jul 1998 19:48:41 -0400
Organization: Sentex Communications
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Tuomo A Turunen wrote:
> 
> HELP !!??
> I'm programming a very nice game with DJGPP and allegro. I use SVGA
> 640*480*256 colors, so graphic looks good. But the problem is the
> double buffering. It's just too slow. Example :
> 
>   BITMAP *buffer = create_bitmap(640, 480);
> 
>   clear(buffer);
>   while( game_continues) {
>     // some drawwing on the buffer
>     blit(buffer, screen, 0, 0, 0, 0, 640, 480);
>   }
> 
> That is a the only way I can think of, but itsn't fast enough.
> So is there any faster way to do that 'blit(buffer, screen, ...)' ???
> 
> Tuomo Turunen

Have you tried Page flipping.  If your using 256 colours most SVGA cards
will be able to handle it, (ones with 1 meg on it).  I've found that
using page flipping cuts down my re-draw time in about half compared to
double buffering.