Re: Use of forked Compute Processes

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From: Yair Kurzion (yair++at++polygon.engr.sgi.com)
Date: 10/09/2000 11:37:27

Hello Brian !

> I've have a desire to create an asynchronous compute process in my
> Performer program to do some calculations that may span many frame
> times. I have read the man pages on setting PFMP_FORK_COMPUTE mode in
> pfMultiprocess and in defining a callback using pfComputeFunc but am a
> little fuzzy on the specifics of passing data back and forth from my
> main app and the compute process. Do I have to use a pfFlux or do I use
> pfPassComputeData or both? I have searched the archive and all demo apps
> in vain for an example of using this feature of Performer. Can anyone
> point me to an example please?

pfPassComputeData is the right way to pass data from APP to COMPUTE in a
frame accurate fashion.

A pfFlux is used for passing data down-stream. In other words, it will pass
data in a frame accurate fashion going from left to right in the streams:

    DBASE -> APP -> CULL -> DRAW
    COMPUTE -> APP -> CULL -> DRAW
    APP -> ISECT

Passing COMPUTE data is very similar to passing DBASE data. You can look at a
DBASE data example under:

    pguide/libpf/C/flux_chase.c

Search for pfAllocDBaseData and pfPassDBaseData.

-yair 

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