On Thu, 4 Nov 1999, Amancio Hasty wrote:
> > 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?
It doesn't. DX8 might deal with this, I'm not sure.
--
Doug Rabson Mail: [EMAIL PROTECTED]
Nonlinear Systems Ltd. Phone: +44 181 442 9037
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