frame rate control with IRIX 5.3 revisited

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Beaver, Jim (beaver_jim++at++smtpgwy.si.com)
Fri, 17 Feb 95 16:26:19 EST

Hello again,

  Thanks to those who replied to my plea for help. What I still don't
understand, however, is why my application running under IRIX 4.0.5 and
Performer 1.0 didn't exhibit the same problem. But that's not what this message
is about. Following Jean Daigle's suggestion, I tried using
pfPhase(PFPHASE_LIMIT). The pfFrame man page says that "PFPHASE_LIMIT is
equivalent to PFPHASE_FREE_RUN except that the application can go no faster than
the frame rate specified by pfFrameRate although it may go slower". This is
exactly what I want. Also, I was under the impression that, when using
PFPHASE_LIMIT, if the scene could not be drawn in the specified frame rate, it
would back down to the next slower refresh rate, not the next slowest multiple
of the specified frame rate. Unfortunately, it doesn't seem to work on my
Indigo2. When I tried PFPHASE_LIMIT, my application behaved as if I was using
PFPHASE_FREE_RUN. The frame rate was not being limited. at lest according to the
pfDrawChanStats display, to my specified frame rate, either as an upper or lower
limit. Is PFPHASE_LIMIT possibly only functional in multi processor machines?

Thanks
Jim Beaver
Smiths Industries Aerospace - Grand Rapids
616-241-7671

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