Re: [info-performer] nVIDIA frame lock

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From: Hugues De Keyzer (hugues++at++depinxi.be)
Date: 01/18/2006 02:28:08

Yes, we use the primary head. Vertical refresh is correctly synchronized, the problem is regarding buffer swap synchronization. When using the two GLX functions, the whole display group should wait for each display to be ready before swapping all together, isn't it? I mean, they should all swap when the slowest display is ready, no? For example, if one of the computers sleeps for 5 seconds before asking to swap, all the others should wait for him. This is what we want but it doesn't seem to be the case. Is this what swap sync is for, or not? If not, how is it supposed to be used?

On Wednesday 18 January 2006 10:32, Rick van Haasen wrote:
> Hugues,
>
> Are you using the primary head? synchronisation is only done
> on the primairy head, the second head of the card is not
> synchronised. We faced this situation some months ago.
> Someone from nvidia support told me that the 4500G is "hardwarewise"
> capable of synchronisationing on the second head, but that this
> capability was not yet implemented in the driver (this was a few
> months ago).
>
> Rick
>
> owner-info-performer++at++performer.engr.sgi.com wrote on 2006-01-18 09:06:12:
>
> > Hi all,
> >
> > we are trying to use our OpenGL Performer application on several
> > computers with an nVIDIA Quadro 4500G card and use the frame lock
> > capability to ensure the buffer swaps happen synchronously on all
> > the cards. We are using GNU/Linux. Frame lock is enabled with the
> > nvidia-settings utility. For swap sync, we use glXJoinSwapGroupNV()
> > and glXBindSwapBarrierNV() but the displays doesn't synchronise
> correctly.
> >
> > Has anyone faced the same problem?
> >
> > Thank you.
> >
> > Regards,
> >
> > Hugues De Keyzer
> > de pinxi
> >
> >
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