intermittent 'GL context' error

[damien.j...@gmail.com]

Hi all,

I'm having an intermittent problem with pyglet - importing 'pyglet.gl' sometimes gives the following:

----

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/damien/venv/pyglet_test/lib/python2.7/site-packages/pyglet/gl/__init__.py", line 236, in <module>
    import pyglet.window
  File "/home/damien/venv/pyglet_test/lib/python2.7/site-packages/pyglet/window/__init__.py", line 1817, in <module>
    gl._create_shadow_window()
  File "/home/damien/venv/pyglet_test/lib/python2.7/site-packages/pyglet/gl/__init__.py", line 205, in _create_shadow_window
    _shadow_window = Window(width=1, height=1, visible=False)
  File "/home/damien/venv/pyglet_test/lib/python2.7/site-packages/pyglet/window/xlib/__init__.py", line 166, in __init__
    super(XlibWindow, self).__init__(*args, **kwargs)
  File "/home/damien/venv/pyglet_test/lib/python2.7/site-packages/pyglet/window/__init__.py", line 516, in __init__
    context = config.create_context(gl.current_context)
  File "/home/damien/venv/pyglet_test/lib/python2.7/site-packages/pyglet/gl/xlib.py", line 186, in create_context
    return XlibContextARB(self, share)
  File "/home/damien/venv/pyglet_test/lib/python2.7/site-packages/pyglet/gl/xlib.py", line 300, in __init__
    super(XlibContext13, self).__init__(config, share)
  File "/home/damien/venv/pyglet_test/lib/python2.7/site-packages/pyglet/gl/xlib.py", line 203, in __init__
    raise gl.ContextException('Could not create GL context') 
pyglet.gl.ContextException: Could not create GL context
----

It doesn't happen every time - seems to be about 50% (but not in any discernable sequence). It occurs across multiple computers with the same Nvidia card, but not on my laptop with an (older) ATI card.

This is on linux (Arch) with nvidia drivers. My video card is 'NVIDIA Corporation GK107 [GeForce GTX 650] (rev a1)'. My version of pyglet is '1.2.3' (installed via pip) in an otherwise clean virtualenv. It is reasonably new behaviour - it has been working fine up until the last month or so.

Does anyone have any ideas on what might be going on, or how to get more information on the error?

Thanks!

[Rob]

Hi,

You can try enabling GL tracing to see which GL calls cause errors while creating the context. Try adding the following at the start of your application:

import pyglet

pyglet.options['debug_gl_trace'] = True

Optionally you can also add

pyglet.options['debug_gl_trace_args'] = True

Rob

Op zaterdag 11 juli 2015 05:09:28 UTC+2 schreef damien.j...@gmail.com:

[Damien Mannion]

Hi Rob,

Thanks for your reply. I have tried enabling the option you suggested. When the import is successful, I get a series of mostly 'glGetStringi'. When the import is unsuccessful, I immediately get the ContextException and no debugging info appears.

I have done a bit more investigating and it seems like the problem is because 'glx_context_id' is being returned as a large negative number (e.g. -181426592, -1261185472), as opposed to a large positive number when it is successful. I'm not sure what this means though?

Cheers,

Damien.

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[Rob van der Most]

That probably means we are using a 64 bit pointer as a 32 bit pointer somewhere. Can you create an issue for this?

Rob

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[Damien Mannion]

Thanks - issue created.

I also find that everything proceeds fine if I remove the negative glx_context_id check (i.e. it imports successfully and the program also seems to behave normally).

-damien