[info-performer] Texture/fill-rate performance

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From: Krajcarski, Rob (Rob.Krajcarski++at++drdc-rddc.gc.ca)
Date: 07/17/2002 14:55:12

Hello,

I'm trying to improve the performance of an application that is being run on
an InfiniteReality Onyx machine. Right now the current bottleneck seems to
be the fill rate, at least thats what the frame stats indicate (its a stereo
application, 2xVGA resolution, draw times are about 5ms each channel, with
the fill time looking like 12ms).

I've made sure that I've done the steps that I could find for improving fill
performance, like clearing the buffer right away. Now the next thing I
tried was to look at expensive fill modes (pfAntialias/pfTransparency).
What I was suprised to see was that the fill time completely disappeared
when I got rid of textures. Now I was under the impression that texturing
was 'free' on InifiniteReality machines....so then I got confused..

My question is really what factors/situations does texturing lead degraded
fill performance. Any help on this matter would be greatly appreciated..

Thanks

Rob Krajcarski

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