From: "Knutte" Newsgroups: comp.os.msdos.djgpp References: <6uAn3.7443$ip4 DOT 11733 AT nntpserver DOT swip DOT net> <379f2171 DOT 0 AT news DOT uni-bielefeld DOT de> <9bVn3.8378$ip4 DOT 12411 AT nntpserver DOT swip DOT net> <37a027bc DOT 0 AT news DOT uni-bielefeld DOT de> <7nptn7$6ks$1 AT taliesin DOT netcom DOT net DOT uk> Subject: Re: Vsync! Lines: 43 X-Newsreader: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3110.3 Message-ID: NNTP-Posting-Host: 130.244.186.164 X-Complaints-To: news-abuse AT swip DOT net X-Trace: nntpserver.swip.net 933286133 130.244.186.164 (Fri, 30 Jul 1999 00:08:53 MET DST) NNTP-Posting-Date: Fri, 30 Jul 1999 00:08:53 MET DST Organization: A Customer of Tele2 X-Sender: s-314852 AT dialup186-3-36 DOT swipnet DOT se 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... It´s working now so... What I meant was that when I use Vesa 1.0 it work. My thought was that Allegro´s Autodetect function didn´t 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