PFMP_APPCULL_DRAW timing

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Simon Gibbs (Simon.Gibbs++at++gmd.de)
Mon, 23 Sep 1996 13:55:53 +0200 (MDT)

I've modified simple.c to use PFMP_APPCULL_DRAW, my
aim is to get a single frame latency as shown in
the Performer 2.0 Progamming Guide pg 219, ie:

PFMP_APPCULL_DRAW

A0 C0 | A1 C1 | A2 C2 | A3 C3 | ...
| D0 | D1 | D2 | ...

But when I turn on statistics it shows a two
frame latency (this happens on both an Onyx and Indy):

A0 | C0 A1 | C1 A2 | C2 A3 | ...
| | D0 | D1 | ...

However if I place pfFrame BEFORE pfSync in the main loop
then I get something which looks like what the manual states.

So my question is whether it's ok to invert the pfSync/pfFrame
order (and whether the statistics display can be trusted
in this case) - if not, how does one get a single frame
latency using PFMP_APPCULL_DRAW?

Many thanks,
Simon Gibbs

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Simon Gibbs
GMD - German National Research Center for Information Technology
53754 Sankt Augustin
GERMANY
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Email: Simon.Gibbs++at++gmd.de
WWW: http://viswiz.gmd.de/~simon
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