Re: [PyOpenGL-Users] bug in glDrawBuffers?

[Gijs <in...@bs...>]

On 2/18/09 4:04 PM, Gijs wrote:
> On 2/18/09 3:28 PM, Mike C. Fletcher wrote:
>> Gijs wrote:
>> ...
>>> Hello Mike,
>>>
>>> Thanks for your reply. I needed to cast some arguments (img, fbo) to
>>> int and after that the code ran just fine, but the error remains
>>> (pasted below). Also, I made a Python-C module to see whether the same
>>> error would occur there. But with the exact same code in C, I could
>>> call glDrawBuffers to draw to multiple buffers without any problems.
>>> So even though the Python code should not really do much with the
>>> call, it does something to mess it up.
>> Hmm, you *shouldn't* have to cast arguments, that code ran without
>> errors on my machine.  Can you confirm that you're running PyOpenGL
>> 3.0.0c1?  Also, do you have numpy installed?  (Default array return
>> value is numpy arrays).  If you can print or pdb at the failing point
>> and tell me precisely what types the values are, it may be that on your
>> platform we're hitting a different code-path than on amd64-linux.
>>
>> Thanks,
>> Mike
>>
> I was running 3.0.0b8 and after I upgraded to the latest version,
> 3.0.0c1, the glDrawBuffers call worked perfectly :). The casting was
> however still required. The type fbo was<type 'numpy.uint32'>. It
> failed with:
> Traceback (most recent call last):
>     File "./test-buffers.py", line 35, in<module>
>       test_glDrawBuffers_list_valid()
>     File "./test-buffers.py", line 20, in test_glDrawBuffers_list_valid
>       glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo)
>     File
> "/Library/Python/2.5/site-packages/OpenGL/platform/baseplatform.py",
> line 275, in __call__
>       return self( *args, **named )
> ctypes.ArgumentError: argument 2:<type 'exceptions.TypeError'>: wrong type
>
> I tend to cast everything that needs to be passed to OpenGL and is
> returned from OpenGL functions (like the genTextures and genFramebuffers
> function). Guess I kinda got used to it but I knew it wasn't normal.
>
> Regards,
>
> Gijs
Oh, and yes, I have numpy installed.