Re: Onyx genlocking

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From: Don Burns (don_burns++at++peru.engr.sgi.com)
Date: 01/18/2001 09:26:15

> 3.We run perfly -G town.pfb (G means gangdraw ); When pipes are not
> genlocked , performer warns about
> shifting phase between pipes when running multipipes apps , now after
> genlocking is silent -> pipes should be genlocked.
>
> BUT runnig perfly the image on the edge bettween pipes is jumping,
> skipping .... -> pipes do not swap the same buffer on the same
> time . Why ?

GangDraw implies Swapready (not genlock). From the pfChannel man page:

          PFCHAN_SWAPBUFFERS_HW
               All channels swap buffers at the same time. Under IrisGL the
               GANGDRAW feature of the mswapbuffers function, under OpenGL the
               glxSwapBarrier extension, is used to synchronize buffer
               swapping through hardware interlocking. When channels are
               distributed across more than one pipe, the SwapReady signal is
               to be connected between the pipes. This signal can also be
               used to synchronize graphics pipelines across multiple
               machines.

-don

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