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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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