Mail Archives: djgpp/2000/03/12/00:18:00

Date: Sun, 12 Mar 2000 09:39:17 +0600 (LKT)
From: Kalum Somaratna aka Grendel <evilgrendel AT gmx DOT net>
X-Sender: root AT darkstar DOT grendel DOT net
To: Damian Yerrick <DONT DOT YOU DOT DAREd_yerrick AT hotmail DOT comSEND DOT SPAM>
cc: djgpp AT delorie DOT com
Subject: Re: Page Flipping with Allegro?
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On Sat, 11 Mar 2000, Damian Yerrick wrote:

> 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.

Hey I have a Vodooo 3 2000 and AFAIK allegro programs run with no problem.
Surely you must be meaning either some other card or your info maybe plain
wrong Damien?

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