Re: Performer 2.0 Problems

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Nathaniel Bletter (nat++at++od.sri.com)
Wed, 13 Mar 1996 11:41:16 -0800

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Adressing your 3rd problem: why OpenGL performer is so much slower than IrisGl
performer on VGX's. This is because OpenGL is translated to IrisGL for VGX's
using something called IGLoo, I think. SGI didn't bother to right a "native"
version of OpenGL for these machines. We have noticed this is many ways:
OpenInventor 2.0 runs at about half the speed of Inventoir 1.1 for the same
reason, Photoshop updates the screen unbearably slowly since it uses an OpenGL
graphics window. Only when we switched to an X window mode was Photoshop
usable.

So, since you have the choice of OpenGL vs. IrisGl at compilation, use IrisGL
on VGX's, and OpenGL on other machines.

Nat Bletter SRI International nat++at++od.sri.com http://os.sri.com/people/nat/ (415) 859-4358

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