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Date:      Thu, 04 Nov 1999 10:01:37 -0800
From:      Amancio Hasty <hasty@rah.star-gate.com>
To:        Soren Schmidt <sos@freebsd.dk>
Cc:        yokota@zodiac.mech.utsunomiya-u.ac.jp (Kazutaka YOKOTA), current@FreeBSD.ORG
Subject:   Re: vga driver and signal 
Message-ID:  <199911041801.KAA46924@rah.star-gate.com>
In-Reply-To: Your message of "Thu, 04 Nov 1999 14:13:23 %2B0100." <199911041313.OAA93012@freebsd.dk> 

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> It seems Kazutaka YOKOTA wrote:
> > 
> > AFAIK, not all video cards generate the vertical retrace interrupt.
> > Even worse, some BIOSes have a configuration option which instract the
> > BIOS NOT to assign an IRQ to the PCI video card.
> > 
> > I fully agree that the vertical retrace interrupt will be of great
> > value, but I wonder if it is really worth the trouble, because it might
> > be available in only few cards and systems at the end of the day...
> > 
> > Well, I may be wrong :-)
> 
> Well, sortof :)
> 
> The delay caused by the system to process the interrupt and deliver
> the signal etc is unpredictable (well sortof) and is almost certainly
> too long so the window of opportunity will be missed ...
> 
> This has been discussed to death many times in the past for the
> mouse pointer updates etc etc...
> 

Let me ask a different question: How does Microsoft's DirectX handle delivery
of vertical retrace interrupt?


-- 

 Amancio Hasty
 hasty@rah.star-gate.com




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