Re: Synchronizing HW pipes

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Masanori Kakimoto (kaki++at++kaki.nsg.sgi.com)
Mon, 16 Oct 1995 18:19:46 +0900

PFPHASE_LOCK, PHPHASE_FLOAT, PFPHASE_FREE_RUN and PFPHASE_LIMIT have
been tried, but did not solve the problem. In our case, PFPHASE_LOCK
should be used. PFPHASE_FREE_RUN makes the delay less noticeable
because of the high frame rate, but we need complete sync and stable
frame rate.

Genlock is connected and setmon -g is specified for the slave pipes.
However, the single HW pipe experiment also shows up the same delay.
This suggests the cause lies in somewhere other than genlock.

It does not make any difference whether PFCHAN_SCENE is used or the
scene is set to each channel individually.

On Oct 13, 3:18pm, Angus Dorbie wrote:
> Subject: Re: Synchronizing HW pipes
> 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.
> .
> .
> .
> > In the program, PFCHAN_VIEW and PFCHAN_SWAPBUFFERS are being shared
> > though all others are not. This is double-checked by inquiring with
> > pfGetChanShare.
> >
> .
> .
> .
> > --
> > Masanori Kakimoto mailto:kaki++at++nsg.sgi.com
> > East Asia Technology Center, Tokyo Office,
> > c/o Nihon Silicon Graphics K.K.
> > TEL:+81-3-5488-1852 FAX:+81-3-5420-2397 Voicemail:5-7465
> >
> >-- End of excerpt from Masanori Kakimoto
>
>
>
> --
> Angus Dorbie,
> Silicon Graphics Ltd, UK
> dorbie++at++reading.sgi.com
>-- End of excerpt from Angus Dorbie

-- 
Masanori Kakimoto                  mailto:kaki++at++nsg.sgi.com
East Asia Technology Center, Tokyo Office,
c/o Nihon Silicon Graphics K.K.
TEL:+81-3-5488-1852  FAX:+81-3-5420-2397  Voicemail:5-7465

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