Re: IrisGl/OpenGl

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Allan Schaffer (aschaffe)
Wed, 8 May 1996 16:43:03 -0700

On May 8, 3:16pm, Hugo Penafiel wrote:
>
> In moving over to Performer 2.0/OpenGL I am finding out that our
> application is running noticably slower than when using Performer
> 1.2/ IrisGl. I was recently reminded that the RE2 runs IrisGl native
> (not surprised however) and OpenGl in some sort of interpreted(?)
> mode.

Not quite true. RealityEngine implements "both" IRIS GL and OpenGL
natively.

You may be confusing it with Impact or InfiniteReality, both of which
implement OpenGL natively and IRIS GL via a software layer. Or VGX
and PI, which are the other way around.

> So I
> would like to know what are my options to regain performance. One that
> comes to mind is to stick with IrisGl (short term fix). Are there any
> options to upgrade an RE2 graphics board that runs OpenGL native as the
> Impacts and IR's do? Should I start begging the company I buy some
> Performer applications from to please continue support for IrisGl?
> Any other options to consider!?

If you're running 5.3 on a RealityEngine system and need to use
OpenGL, make sure to load patch 918 (replaces 154). 918 contains
a number of RE OpenGL improvements. Or even better, run 6.2.

With 6.2 I would expect IRIS GL & OpenGL performance to be "pretty
close" on an RE, according to the measurements I've seen, so if there
are *big* differences, it's worth investigating.

Allan

-- 
Allan Schaffer                                             aschaffe++at++sgi.com
Silicon Graphics                            http://reality.sgi.com/aschaffe

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