Re: Python 3 crash when running on optimus card

On 14-03-03 05:09 PM, Ákos Tóth wrote:
> Hi,
>
> I recently started using pyOpenGL with Python 3.3 on Ubuntu 13.10. I 
> am in the unfortunate situation of owning a laptop with a switchable 
> (Optimus technology) dedicated video card. With the most recent 
> version of pyOpenGL (3.1.0b1) installed, the program crashes quite 
> seriously when running the line "from OpenGL.GL import *" - to the 
> point where Ubuntu actually opens an error dialog for this. This 
> problem is specific to Python 3 with optirun - in C++, OpenGL works on 
> the optimus card without any hiccups, and version 3.0.2 with Python 
> 2.7 also works without a problem.
>
> Tests concluded so far:
> - Python 2.7, pyOpenGL and accelerate version 3.0.2 with or without 
> optirun. No problems.
> - Python 3.3, pyOpenGL and accelerate version 3.1.0b1 without optirun 
> - no problems but the intel card only supports openGL contexts up to 
> version 3.1, which is far behind what I require.
> - Python 3.3, pyOpenGL and accelerate version 3.1.0b1 with optirun, 
> crash on import. In the pastebin link below is the output of python3 
> -vvvvvc "from OpenGL.GL import *".
Could you also test 2.7 + PyOpenGL 3.1.0b1 so we can see whether we have 
a problem with PyOpenGL 3.1 + Optimus or just with PyOpenGL 3.1 + 
Optimus + Python 3.x.  Testing PyOpenGL 3.1.0b1 without the Accelerate 
module on Python 2.7 would also help to narrow down failure cases.

If you could do a trace of the import to see what line fails, that would 
help.  To do that, create a file with just the import statement, then run:

     python -m trace --trace -f yourfile.py

it should print out each line as it executes and the last line printed 
should be the one that causes the crash.

The most likely cause of a crash is that we have something doing GL 
calls before there's a GL context.

Thanks,
Mike

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


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