Depth-map textures on IR

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Robert Doyle (doyle++at++coralsea.ait.nrl.navy.mil)
Fri, 4 Apr 1997 15:07:51 -0500

I posted the below in the Open_GL newsgroup. I received commiseration from
people with the identical problem but no solution. The Open_GL calls are made
in a Performer draw callback so perhaps some Performers are aware of the
problem and the solution:

The use of:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_SGIX, GL_TRUE)
on our Onyx1 Infinite Reality (patch 1699) causes a screen freeze followed by a
system crash. The machine supports GL_SGIX_shadow_ambient, GL_SGIX_shadow, and
GL_SGIX_depth_texture. Is anyone aware of a patch or a workaround to avoid the
problem?

The problem can be duplicated with shadowmap.c found at:
http://www.sgi.com/Technology/openGL/advanced/programs.html. The typo on line
363 (strstr(extensions, "GL_SGIS_depth_texture"))) must be corrected, however.

Thanks,
Bob Doyle

Robert J. Doyle, Jr. http://overlord.nrl.navy.mil
Code 5594 http://overlord.nrl.navy.mil/marines.html
Naval Research Laboratory e-mail: doyle++at++overlord.nrl.navy.mil
Washington, DC 20375-5000 fax: 202-404-7402
                                phone: 202-767-8395

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