Re: [PyOpenGL-Users] shaders over X windows

[Mike C. F. <mcf...@vr...>]

Philip Winston wrote:
> I have a PyOpenGL app which runs well locally on Linux.  But if I run
> it remotely with X windows I get an error:
>
>   File
> "/usr/lib/python2.6/site-packages/PyOpenGL-3.0.1a4-py2.6.egg/OpenGL/platform/baseplatform.py",
> line 335, in __call__
>     self.__name__, self.__name__,
> <class 'OpenGL.error.NullFunctionError'>: Attempt to call an undefined
> function glCreateProgramObjectARB, check for
> bool(glCreateProgramObjectARB) before calling
>
> I changed glCreateProgramObjectARB() to glCreateProgram() but I get a
> similar error.
>
> Should this work over X Windows? I haven't used X Windows in years,
> and never with OpenGL apps. Does it require maybe a special X server
> or configuration?  I've tried just X servers on recent Linux and MacOS
> machines, and gotten the same error. Thanks.
I wouldn't be too surprised to see this fail.  Extensions of this type
(ones which require communication/coordination between the server and
client side) require extensions to the GLX protocol to support remoting
of the operation.  I'd have thought that shaders would be a pretty
straightforward one compared to e.g. VBOs, but that doesn't mean its
necessarily been implemented yet... here's a forum post from last year
that gives the general background:

   
http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=249826

that's obviously rather old, but it would seem to match your experience.

HTH,
Mike

-- 
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  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com