Re: [PyOpenGL-Users] access violation when calling glGenFramebuffers

[Patrick D. <pyo...@pd...>]

As I'm trying to get my program fit for the future, I would like to 
avoid "downgrading" to 32 bit python.

I tracked the problem a bit further:

I replaced

         self.framebuffer_id = glGenFramebuffers(1);

with

         fbo = ctypes.c_uint(1)
OpenGL.raw.GL.EXT.framebuffer_object.glGenFramebuffersEXT(1, 
ctypes.byref(fbo))
         self.framebuffer_id = int(fbo.value)

I'm not sure if the code is ctype-wise correct but I think that doesn't 
make a real difference for the error:

Traceback (most recent call last):
...
   File "C:\Users\Patrick\Dev\PCT\open_gl_widgets.py", line 203, in __init__
     OpenGL.raw.GL.EXT.framebuffer_object.glGenFramebuffersEXT(1, 
ctypes.byref(fbo))
   File "C:\Python27\lib\site-packages\OpenGL\platform\baseplatform.py", 
line 379, in __call__
     return self( *args, **named )
WindowsError: exception: access violation writing 0xFFFFFFFFE812A790

Could anyone from the developers please help me track down the problem 
further? I'm very happy to assist in fixing this problem!

Cheers,
Patrick


Am 03.04.2013 17:50, schrieb Cyrille Rossant:
> I had a similar problem with a similar configuration and a similar 
> graphics card. I couldn't solve the problem, so I ended up removing my 
> whole 64 bits Python distribution and reinstalling everything with 
> Python 32 bits... and it worked.
>
> Cyrille
>
>
> 2013/4/3 Patrick Dietrich <pyo...@pd... 
> <mailto:pyo...@pd...>>
>
>     Hi everyone,
>
>     I have a problem when calling glGenFramebuffers on Windows 7 64 bit:
>
>     Traceback (most recent call last):
>          ...
>        File "C:\Users\Patrick\Dev\PCT\open_gl_widgets.py", line 197,
>     in __init__
>          self.framebuffer_id = glGenFramebuffers(1);
>        File "latebind.pyx", line 32, in
>     OpenGL_accelerate.latebind.LateBind.__call__
>     (src\latebind.c:667)
>        File "wrapper.pyx", line 308, in
>     OpenGL_accelerate.wrapper.Wrapper.__call__ (s
>     rc\wrapper.c:5356)
>        File
>     "C:\Python27\lib\site-packages\OpenGL\platform\baseplatform.py",
>     line 379
>     , in __call__
>          return self( *args, **named )
>     WindowsError: exception: access violation writing 0xFFFFFFFFEA94A760
>
>     My PyOpenGL version is 3.0.2, including PyOpenGL_accelerate 3.0.2. I
>     have installed both packages with the windows installers (AMD64
>     versions). My graphics adaptor is an Intel HD Graphics 4000 for which
>     I'm using the newest drivers (version 9.17.10.2843).
>
>     Calling bool(glGenFramebuffers) just before the call to
>     glGenFramebuffers returns True. I have also tried to use the extension
>     version glGenFramebuffersEXT but with the same result.
>
>     What might be the problem and how can I work around it?
>     How can I access the low level C-routines of OpenGL?
>
>     Cheers,
>     Patrick
>
>
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