[PyOpenGL-Devel] contextdata.py 'Unhashable type' error with OSMesa

[paul m. <pau...@gm...>]

Howdy,

I am using PyOpenGL 3.1.0 with OSMesa for off-screen rendering. This worked
fine until I attempted to use the ARB_fragment_program extension to use a
custom fragment program (please don't question my use of ARB_vertex_program
- I need to support an ancient OpenGL configuration).

When calling OpenGL.GL.ARB.fragment_program.glGenProgramsARB, my program
crashes with an 'Unhashable type' error:

  File "/.../glimage_funcs.py", line 126, in init
    glimg.fragmentProgram = arbfp.glGenProgramsARB(1)
  File "/.../python2.7/site-packages/OpenGL/latebind.py", line 45, in
__call__
    return self._finalCall( *args, **named )
  File "/.../python2.7/site-packages/OpenGL/wrapper.py", line 657, in
wrapperCall
    result = wrappedOperation( *cArguments )
  File "/.../python2.7/site-packages/OpenGL/platform/baseplatform.py", line
401, in __call__
    if self.load():
  File "/.../python2.7/site-packages/OpenGL/platform/baseplatform.py", line
390, in load
    error_checker = self.error_checker,
  File "/.../python2.7/site-packages/OpenGL/platform/baseplatform.py", line
148, in constructFunction
    if (not is_core) and not self.checkExtension( extension ):
  File "/.../python2.7/site-packages/OpenGL/platform/baseplatform.py", line
261, in checkExtension
    set = contextdata.getValue( 'extensions', context=context )
  File "/.../python2.7/site-packages/OpenGL/contextdata.py", line 106, in
getValue
    contextStorage = storage.get( context  )
TypeError: unhashable type


I have tried disabling OpenGL.contextdata with:

    OpenGL.ERROR_ON_COPY = True
    OpenGL.STORE_POINTERS = False

(as detailed in the OpenGL.contextdata module documentation), but this has
no effect.

Any ideas on how to overcome this?

Thanks very much,

Paul McCarthy