[Open-graphics] Video interrupt enable/disable

[Attila Kinali]

On Tue, 17 Apr 2007 15:09:10 -0400
"Timothy Normand Miller" <theosib at gmail.com> wrote:

> On 4/17/07, Attila Kinali <attila at kinali.ch> wrote:
> 
> > No need to implement a complex interrupt handler that might
> > be calleded a few ms later and thus after the card has left
> > the blank time already.
> 
> A few ms is a long time.  

Yes, but that's what you have to work with on PCs.
AFAIK interrupt reaction time is still in the 1-2ms range
for an average PC (from interrupt asserted until ISR is called).

> It's also unlikely enough to always happen
> within such a short time of the interrupt.  It's generally just better
> to do in software, because it's simpler and infrequent.  It's so
> infrequent, in fact, that it doesn't really matter how inefficient it
> might be.

Yes, but there are more things that generally need to be
done during blank time. E.g. the picture flip of a video
player could be implemented this way, w/o any additional
specialized hardware. I'm not sure whether it's worth
it, but it might be interesting to test.

			Attila Kinali

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