Jon Leech at SGI notified me that there's a bug in the GL/glext.h file
from March 22 (GL_GLEXT_VERSION=11).  This is the version included with
Mesa 4.0.2 and is currently in the DRI tree.

The tokens GL_DOT3_RGB_EXT and GL_DOT3_RGBA_EXT have the wrong values.
They should _not_ have the same value as the corresponding
GL_ARB_texture_env_dot3 tokens since there is slightly different
behaviour between the two extensions.

The corrected glext.h file can be found at
http://oss.sgi.com/projects/ogl-sample/registry/

I'm in the process of incorporating it into the Mesa and DRI trees now.
Unfortunately, fixing the glext.h file means I also have to fix some
Mesa code.

In the mean time, if you're using GL_EXT_texture_env_dot3 be aware of
the side-effects of this change.  For example, if you update your
GL/glext.h file Mesa 4.0.2 will not recognize the corrected token
values and will generate error values if you try to use them.

I think that a new Mesa 4.0.3 release to fix this (and a few other
minor glitches) will be a good idea.

-Brian

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