[ pyopengl-Bugs-3404017 ] glProgramParameteri is undefined

Bugs item #3404017, was opened at 2011-09-04 09:41
Message generated for change (Comment added) made by mcfletch
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Category: GL
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Mike C. Fletcher (mcfletch)
Summary: glProgramParameteri is undefined

Initial Comment:
glProgramParameteri is undefined. This makes usage of geometry shaders impossible.

The error happens here:

File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/OpenGL/platform/baseplatform.py", line 344, in __call__
    self.__name__, self.__name__,
OpenGL.error.NullFunctionError: Attempt to call an undefined function glProgramParameteri, check for bool(glProgramParameteri) before calling


A workaround for the windows platform can be found here:
https://sites.google.com/site/dlampetest/python/geometry-shaders-from-python
and here:
http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=277436

Unfortunately I couldn't find a workaround for the mac or linux.
If you have questions or a tip for a workaround, please write me: pyopengl [at] pdietrich.net

Cheers!
Patrick

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>Comment By: Mike C. Fletcher (mcfletch)
Date: 2011-09-04 17:02

Message:
It's definitely there in bzr head, also included is an alias in
OpenGL.GL.shaders that uses either core or the ARB.geometry_shader4
version.  That doesn't, however, currently use the EXT.geometry_shader4 or
ARB.get_program_binary version.  IIRC the get_program_binary version, if
available, changes the definition of the entry point (ick!), but I'm
guessing there shouldn't be much hardware that provides the EXT version but
*not* the ARB version of geometry_shader4.

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