Re: Multiple pipes

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From: Angus Dorbie (dorbie++at++sgi.com)
Date: 06/28/2000 13:17:46

Yes,

perfly has support for hyperpipe written in.

In the file:

/usr/share/Performer/src/sample/C/common/generic.c

do a search for a pfHyperpipe call.

Cheers,Angus.

"David E. Guzman" wrote:
>
> Are there any resources or sample codes that would help me in implementing
> the monster and DPLEX modes in Performer?
>
> Thanks,
>
> On Wed, 28 Jun 2000, Allan Schaffer wrote:
>
> > On Jun 26, 2:17pm, David E. Guzman wrote:
> > > Is it possible to have multiple pipes, each with its own channel, going to
> > > the same window?
> >
> > Let me take a wild guess and predict, what you're hoping to do is
> > boost rendering performance by having two independent OpenGL DRAW
> > processes both rendering into the same window.
> >
> > This is technically possible but doesn't work out the way you might
> > have hoped. The window would be hopelessly poor-performing because
> > of context switching in the graphics hardware pipeline. An analogy
> > of what's happening would be two (or more) chefs trying to whip eggs
> > in the same bowl -- it only works if they take turns.
> >
> > Performer operates with the knowledge that one processor sending
> > OpenGL draw commands to each hardware pipeline is the most effecient
> > setup; so that's what it does. Even if you need to separate the
> > window into multiple viewports (pfChannels) this still holds true.
> >
> > There are ways of multiplexing *multiple hardware pipelines* together
> > and making it all appear as one window, those are the DPLEX and
> > Monster modes Brian mentioned.
> >
> > Allan
> >
> > --
> > Allan Schaffer allan++at++sgi.com
> > Silicon Graphics http://reality.sgi.com/allan
> >
>
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-- 
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 --Albert Einstein

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