Re: Synchronizing HW pipes

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Fri, 13 Oct 1995 15:18:46 +0100

You didn't mention pfPhase, this is important when sharing PFCHAN_SWAPBUFFERS,
two out of the four modes don't help, I forget which ones but try experimenting
with this. You also didn't mention genlock, sorry for bringing this up again if
youre already genlocking.
If this doesn't help then the problem sounds very strange, it's a long shot
but try adding PFCHAN_SCENE to your share mask. I'm only suggesting this
voodoo because I've never tried not using this, when youre desperate you'll
try anything.

On Oct 13, 10:46pm, Masanori Kakimoto wrote:
> Subject: Re: Synchronizing HW pipes
> There was an incorrect description in my first mail.
>
> On Oct 11, 2:29pm, Masanori Kakimoto wrote:
> > The problem is that the attached channels, i.e. left and right displays,
> > seem to be constantly delayed by 1 frame compared to the master channel.
> > This is true even when the master channel renders most of the polygons and
> > the attached channels render much less.
>
> The delay problem occurs regardless of pipe id or #polygons.
> Sometimes pipe0 is late, sometimes pipe1 or pipe2.

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