From:	"Knutte" <trumpetknutte AT swipnet DOT se>
Newsgroups:	comp.os.msdos.djgpp
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Subject:	Re: Vsync!
Lines:	43
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Date:	Fri, 30 Jul 1999 00:12:31 +0200
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Well... Itīs working now so...   What I meant was that when I use Vesa 1.0
it work. My thought was that Allegroīs Autodetect function didnīt properly
"detect" my card.  Hardware vsync not being supported might be the thing
too...

Knutte
Andrew R. Gillett skrev i meddelandet ...
>In comp.os.msdos.djgpp, Michael Stewart wrote:
>> Knutte wrote in message ...
>> >A few minutes after I wrote this I tried to force Allegro to use VESA
1.0
>> >instead of Autodetect. The Attempt was successful so the problem lies
>> within
>> >the communication between Allegro and my GFXcard.  Thank you all for the
>> >help
>>
>>
>> I'd be suprised if that was the case. Any problems with vsync would have
>> been sorted out a long time ago.
>>
>> This is the `standard' method of waiting for the vertical retrace (I
would
>> think Allegro will be similar if not the same). Try it and see if this
>> works.
>>
>> void vsync () {
>>   while (inportb (0x3DA) & 8);
>>   while (! (inportb (0x3DA) & 8));
>> }
>
>I already answered this question quite a while ago. Some video cards
>simply don't support vsync. It is the fault of the video card
>manufacturer. This was done with some video cards several years ago when
>Quake timedemos were an important benchmark. Disabling vsync in Quake
>gives a tiny frame rate improvement. Some video card manufacturers
>deliberately ommitted the vsync facility so that their card would always
>get a 0.1 second timedemo improvement in Quake. Pretty pathetic.
>
>--
>Andrew Gillett      http://argnet.fatal-design.com/     ICQ: See homepage
>"I've always wanted to be a sandcastle." - Chelmer Monkton, Starship Losers

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