From: Marcin Romaszewicz (marcin++at++sgi.com)
Date: 07/18/2002 11:26:10
On Wed, 17 Jul 2002, Krajcarski, Rob wrote:
> 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..
>
Texturing on IR is practically free for 16 bit internal formats. 24 and 32
bit formats have a hit, though I don't know how much of a hit it is. See
if setting a 16 bit format on your pfTextures helps.
> 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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