Re: IRIS GL or OPEN GL? Which one should I use?

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Remi Arnaud (remi++at++remi.asd.sgi.com)
Mon, 23 Sep 1996 10:03:49 -0700

IRISGL is the internal library used on (old) graphic engines:
 Indigo2 Extreme and RealityEngine are the last ones to have a native IrisGL
implementation.
Impact, InfinityReality and all the other graphic engines that SGI is preparing are (will be) OpenGL native.

Programming in IrisGL should be avoided if possible:
 - It will not evolve. Since Impact and IR, every new feature is available through OpenGL, not IRISGL. For example, there is no clipmapping under IrisGL.
 - It is slower than OpenGL on OpenGL based machines. It is using a software implementation of IrisGL named IGLOO.

On the other hand, there is a pretty good implementation of OpenGL on RealityEngine, and generally as fast as IRISGL.

So, the answer is : WRONG. use OpenGL.

Also, there is a software OpenGL for Windows95 from SGI, showned at SigGraph'96, that is faster than others API. So, OpenGL is trully the answer for performances :-)

 -- Remi

 o o Remi ARNAUD - Silicon Graphics, Performer, Advanced Systems Dev o o
 o o Mail Stop 590 - 2011 N. Shoreline Boulevard, Mountain View, CA94043 o o
 o o Email: remi++at++asd.sgi.com - Tel: (415) 933 6208 - Fax: (415) 965 2658 o o

   

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