Re: Performance with performer

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Wed, 8 May 1996 19:09:49 +0100

Iris GL is layered on Open GL so for a given set of state settings and
operations (and software release) you may not see any performance penalty.
Using Open GL is good practice on IMPACT for more reasons than simply
performance although this is one.

The other problem is the resolution of your timing. Rounding to the video
refresh rate when producing timing results is bad practice (your times suggest
this is what you are doing). At least try running in single buffer mode, you
may then find some performance difference.

Rgds,
Angus.

On May 8, 6:12pm, DreamTeam Ltd. wrote:
> Subject: Performance with performer
> I am a bit confused.
>
> We have created a simple program that draws 13,000 polygons on the
> screen, basicly taking the code and makefile of perfly and modify it a
> little.
>
> We have compiled and linked using IRISGL and OPENGL libraries.
>
> The performance resaults:
>
> Indigo2 Extreme IRISGL - 37 fps
> OPENGL - 25 fps
>
> Impact Max IRISGL - 75 fps
> OPENGL - 75 fps
>
> How is it that the IRISGL and OPENGL work the same speed on the
> impact.
>
>
> P.S. there were no textures involved
>
>
> Tnx
> Roni Kass
> V.P. Research & Development
> DreamTeam Ltd.
>-- End of excerpt from DreamTeam Ltd.

-- 
Angus Dorbie,
The Reality Centre,
Silicon Graphics Ltd, UK
dorbie++at++reading.sgi.com

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