From:	Damian Yerrick <DONT DOT YOU DOT DAREd_yerrick AT hotmail DOT comSEND DOT SPAM>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Page Flipping with Allegro?
Organization:	Pin Eight Software http://pineight.8m.com/
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NNTP-Posting-Date:	Sat, 11 Mar 2000 17:47:47 GMT
Distribution:	world
Date:	Sat, 11 Mar 2000 17:47:47 GMT
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

On Sat, 11 Mar 2000 18:35:50 +0600 (LKT), Kalum Somaratna aka Grendel
<evilgrendel AT gmx DOT net> wrote:

>On Sat, 11 Mar 2000, Andrew R. Gillett wrote:
>
>> In comp.os.msdos.djgpp, Kalum Somaratna aka Grendel wrote:
>> > >and some more code along with it to handle the flipping and such,
>> > 
>> > ?? AFAIK scroll_screen does wait for the vsync before modifying any
>> > registers, so what exactly is this code that you wrote to handle the
>> > flipping.
>> 
>> vsync doesn't work on all VESA implementations, which may be why the 
>> reason that Al is getting flicker.
>
>I think that you are meaning that the VGA register based method of
>detecting the vsync won't work with all vesa based implementations. 
>
>This is correct _BUT_ AFAIK Allegro uses the VESA based method of
>obtaining info about vsync etc.. so this should not be a problem as
>reagrds to Al's usage of the Allegro code.

Voodoo cards don't even work with that.

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