Re: No Genlock Warning

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From: Ong Tze Lin (tzelin++at++sgisgp.singapore.sgi.com)
Date: 04/02/2001 17:11:11

Hi Lee,

Yup, Genlock locks the pipe to ensure they all
generate video frames at the same time. Yes, this can
also be used to ensure sync with the display device.

Gangdraw OTOH makes sure they all swap buffers at
exactly the same time. This feature requires
you to cable up the Swap Ready ports on your
graphics hardware.

So- for a fully synchronised hardware setup, you'd
connect up both genlock and swap ready.

I'm not sure where exactly this check is performed,
although its bound to be at a very low level.

Is there any particular reason you're looking for
this message? If you're looking just to disable it,
then use PFNFYLEVEL.. it will always appear when
multiple unsynchronized pipes are detected...

Cheers,
Tze Lin

 --
Ong Tze Lin Tel/VNET: +65 771 0219
Principal Consultant Mobile : +65 9832 7125
SGI Asia Pacific Fax : +65 779 3650
89 Science Park Dr, #03-03/05, Singapore 118261

On Thu, 29 Mar 2001, Lee Marden wrote:

> Thanks. When you mean hardware genlock between the pipes, are talking
> gangdraw between the pipes? My understanding is that gangdraw is
> responsible for synching between pipes, while genlock is for synching to
> an external video, such as the projectors. I believe this message is
> coming from Performer, but I don't know what sub-system, or library.
> Would you know the name of the part of Performer that's checking for
> this?
>
> Thanks,
> Lee
>
> Ong Tze Lin wrote:
> >
> > Hi Lee,
> >
> > Just means you don't have hardware genlock between
> > your pipes. Your channels are still sync'ed
> > internally, which may or may not be adequate for
> > your simulation needs.
> >
> > Cheers,
> > Tze Lin
> >
> > --
> > Ong Tze Lin Tel/VNET: +65 771 0219
> > Principal Consultant Mobile : +65 9832 7125
> > SGI Asia Pacific Fax : +65 779 3650
> > 89 Science Park Dr, #03-03/05, Singapore 118261
> >
> > On Wed, 28 Mar 2001, Lee Marden wrote:
> >
> > > pfUsers,
> > >
> > > I'm getting a warning when I run perfly, that indicates that there is
> > > a problem with genlock across my three pipes. I use the following to
> > > setup the three MCOs (2 channels each):
> > >
> > > ---
> > > set DISPLAY=:0.0
> > > /usr/gfx/setmon -x -S -p 0 2++at++1025x768_60
> > > set DISPLAY=:0.1
> > > /usr/gfx/setmon -g -x -S -p 1 2++at++1025x768_60
> > > set DISPLAY=:0.2
> > > /usr/gfx/setmon -g -x -S -p 2 2++at++1025x768_60
> > >
> > > /usr/gfx/stopgfx; /usr/gfx/startgfx &
> > > ---
> > >
> > > The scene looks ok, so I know that the MCOs are working, but I get the
> > > following warnings:
> > > 17724 PF Warning/Resource: !!!!!!!!!!!!!!!!!! NO GENLOCK
> > > !!!!!!!!!!!!!!!!!!!!!!
> > > 17724 PF Warning/Resource: Screen 1 is phase-shifted 68.657346
> > > degrees from master screen 0.
> > > 17724 PF Warning/Resource: !!!!!!!!!!!!!!!!!! NO GENLOCK
> > > !!!!!!!!!!!!!!!!!!!!!!
> > > 17724 PF Warning/Resource: !!!!!!!!!!!!!!!!!! NO GENLOCK
> > > !!!!!!!!!!!!!!!!!!!!!!
> > > 17724 PF Warning/Resource: Screen 2 is phase-shifted 78.312222
> > > degrees from master screen 0.
> > > 17724 PF Warning/Resource: !!!!!!!!!!!!!!!!!! NO GENLOCK
> > > !!!!!!!!!!!!!!!!!!!!!!
> > >
> > > I've looked through the perfly code and can't find this message. Is
> > > this a Performer message? Any ideas what might be causing this? Should
> > > I be concerned?
> > >
> > > Thanks,
> > > Lee
> > > --
> > > ------------------------------------------------------------------------
> > > Lee Marden Raytheon Company
> > > Principal Software Engineer Northeast C3I Systems
> > > Advanced Modeling & Simulation 50 Apple Hill Dr. (T3MJ21)
> > > Technology Section Tewksbury, MA 01876
> > > Phone: (978) 858-9487 Fax: (978) 858-4336
> > > Email:lee_marden++at++raytheon.com Intranet: http://amasts.msd.ray.com/~lms
> > > ------------------------------------------------------------------------
> > > -----------------------------------------------------------------------
> > > List Archives, FAQ, FTP: http://www.sgi.com/software/performer/
> > > Open Development Project: http://oss.sgi.com/projects/performer/
> > > Submissions: info-performer++at++sgi.com
> > > Admin. requests: info-performer-request++at++sgi.com
> > >
>
> --
> ------------------------------------------------------------------------
> Lee Marden Raytheon Company
> Principal Software Engineer Northeast C3I Systems
> Advanced Modeling & Simulation 50 Apple Hill Dr. (T3MJ21)
> Technology Section Tewksbury, MA 01876
> Phone: (978) 858-9487 Fax: (978) 858-4336
> Email:lee_marden++at++raytheon.com Intranet: http://amasts.msd.ray.com/~lms
> ------------------------------------------------------------------------
>

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