[PyOpenGL-Devel] [ pyopengl-Bugs-890105 ] glFogCoordfEXT () within glBegin - GLerror invalid operation

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Bugs item #890105, was opened at 2004-02-03 20:31
Message generated for change (Settings changed) made by mcfletch
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Category: GL
Group: v2.0.1
>Status: Closed
>Resolution: Duplicate
Priority: 5
Submitted By: Brian Leair (bleair2)
Assigned to: Nobody/Anonymous (nobody)
Summary: glFogCoordfEXT () within glBegin - GLerror invalid operation

Initial Comment:
I'm experiencing a GLerror "invalid operation"
exception when I try to used glFogCoordfEXT () within a
glBegin ()/glEnd () set.

I'm about to delve into the interface C code to see why
s as to what is triggering the exception. I have
observed the following:
#1 calling glFogCoordfEXT () outside of glBegin ()
works as expected.
#2 catching the exception and ignoring it (basically
ignoring it) results in a program that works - I get
the fog effect that I expect.

I don't think I have a stupid user error. I've checked
that glEnable (), glHint (), and glFogx () calls are
appropriate. Plus my program works with code in place
to catch and ignore the exception

I see in the documentation that "invalid operation"
will be thrown if you try to use an extension without
having called the appropriate extension init function,
but I have that.

If this is a stupid user error, I apologize heartily.


I do see in the Error section for the C documentation
of glGetError (), that calling glGetError () during a
glBegin()/glEnd () pair will also generate
GL_INVALID_OPERATION. Could this be related?

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