Re: Performance with performer

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Glen Fraser (Glen.Fraser++at++Softimage.COM)
Wed, 8 May 1996 14:06:32 -0400

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.

It's because your test scene can be redrawn in less than the time of a single
vertical retrace (I expect your monitor refresh rate is set to 76Hz). The
machine doesn't swap buffers any faster than this. A more complex scene should
show a difference between GL and OGL on the Impact. Alternatively, try turning
off double buffering, and see what the performance difference is when your
program doesn't have to block until the next vertical retrace occurs...

Glen.

-- 
======================================================================
 Glen D. Fraser            |  Software Developer -- Realtime Viewing,
 SOFTIMAGE Inc. (Montreal) |     Motion Capture and Motion Control
 Tel: (514)845-1636 x3380  |
 Fax: (514)845-5676        |         Glen.Fraser++at++Softimage.COM
======================================================================
         "Excuse me -- could you build my son a new dog?"

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