Beaver, Jim (beaver_jim++at++smtpgwy.si.com)
Thu, 16 Feb 95 17:39:07 EST
This is a follow-up to the problem I was having with frame rate control on my
Indigo2 with IRIX 5.2/Performer 1.2 (case ID 0338219). I installed IRIX5.3 on my
Indigo2 and I do now, in fact, have frame rate control in my Performer 1.2
application. However, there is another "feature" that has apparently been
introduced which, unless I'm doing something wrong, makes the fix a little less
satisfying than I had hoped for. The problem is this: using a pfPhase of FLOAT
or LOCK, the application runs at the frame rate specified by pfFrameRate just
fine until, say, it has to draw a lot of terrain, for example, such that it
can't get done in the specified time frame. When this happens, instead of the
frame rate slowing down to whatever it takes to complete the drawing, the frame
rate gets cut to half its specified rate. For example, in my application I
specify a frame rate of 12 HZ and if I get to a point that everything can't get
drawn that fast, the frame rate gets cut to 6 Hz. This is only a problem with
PFPHASE_FLOAT and PFPHASE_LOCK. When I tried running with PFPHASE_FREE_RUN, the
same application drawing the same terrain runs at from 10Hz to 14Hz, varying as
different objects come into or go out of view. This causes me problems because
my application "flies" over large areas of terrain and I need it to "run out of
time" a little bit every now and then without the very noticeable slowdown of
running at half speed. Does anyone out there know what this is?
Thanks
Jim Beaver
Smiths Industries - Defense Systems North America 616-241-7671
beaver_jim++at++si.com
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