Le Sat, 21 Oct 2006 11:59:14 -0400,
Lee Revell <rlrevell@email-addr-hidden-job.com> a écrit :
> On Fri, 2006-10-20 at 16:53 -0400, Paul Davis wrote:
> > On Fri, 2006-10-20 at 22:44 +0200, Tim Goetze wrote:
> > > [Fons Adriaensen]
> > > >Input the vertical video sync signal via the audio card and analyse
> > > >its timing in terms of audio samples (e.g. using a DLL). This will
> > > >enable you to predict where the next sync will be in the audio input.
> > >
> > > Back in the 80s, the humble Commodore 64 could be readily programmed
> > > to fire an interrupt on vertical sync. Have 20 years of progress
> > > really deprived us of this fine feature, or is it just missing from X?
> >
> > it was missing from X until Xorg put it back in as an extension. its
> > obviously not of much use in a general purpose X app, since the display
> > may not be the host on which the app runs, making access to the vsync
> > pulse pretty pointless.
> >
>
> I think any Linux system with DRI can do this. Check /proc/interrupts -
> if your video card is listed, then you should have vsync interrupt
> capability.
>
> Lee
>
I have a nvidia card in my box. If I use the nvidia driver, I get it
in /proc/interrupts, but if I use the nv driver, the card don't use an IRQ.
I am not a gamer, and for me, the nv driver is just better because I can use
this IRQ for another hardware and get a better IRQ setup with my rt kernel and
that already at the PIC level.
If compatibility is a concern, I think at it will be better to use a mechanism
provided by X that will exist on every single linux box, as to rely on a
hardware mechanism that will not be found on every system.
-- Dominique MichelReceived on Sun Oct 22 20:15:01 2006
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