Re: [PyOpenGL-Users] Vista, PyOpengl 3.0.1b2 and VBO's

[Nils S. <su...@gm...>]

Hi Alejandro

Thanks for the input, but it is not my code that generates the error.
It is the vbo class from PyOpenGL. Let me illustrate:

icos = np.array([...], dtype=np.float32)
v=vbo.VBO(icos, usage='GL_STATIC_DRAW')
glEnableClientState(GL_VERTEX_ARRAY)
v.bind()
glVertexPointer (3, GL_FLOAT, 0, v)
glDrawArrays (GL_TRIANGLES, 0, 60)

Here v.bind() fails.

It doesn't seem right to modify the vbo class.

On Wed, Jan 20, 2010 at 10:59 PM, Alejandro Segovia <as...@gm...>wrote:

>
> Hi Nils,
>
> I ran into the same issue when porting VBO code from Linux to Mac. In
> my case, the problem was that the function's signature was different
> on both versions: on Linux it received two parameters (one was an
> "out" value where to place the new newly created buffer's reference)
> whereas on Mac it just received the number of buffers to create and
> returned the reference(s) by means of "return".
>
> In order to keep my code portable I surrounded the call in a
> try...except block and fall back to the other call.
>
> Hope this helps.
>
> Best regards,
> Alejandro.-
>
> Sent from my iPhone
>
> On Jan 20, 2010, at 6:03 PM, Nils Sudmann <su...@gm...> wrote:
>
> > Hi, just installed Python 2.6 and PyOpengl 3.0.1b2 on a Vista machine.
> > However, a very simple test program that uses VBO's (and not much
> > else) fails on Vista, but works like a charm on my linux box.
> > This is what it tells me:
> >
> > OpenGL.error.NullFunctionError: Attempt to call an undefined
> > function glGenBuffersARB, check for bool(glGenBuffersARB) before
> > calling
> > Traceback (most recent call last):
> >   File "test.py", line 50, in OnPaint
> >     v.bind()
> >   File "C:\Program Files\Python26\lib\site-packages\OpenGL\arrays
> > \vbo.py", line 217, in bind
> >     buffers = self.create_buffers()
> >
> > I tried setting
> > OpenGL.FORWARD_COMPATIBLE_ONLY = False
> > but I guess my opengl drivers for vista have dropped legacy support
> > altogether (the card is a GTX275).
> >
> > Any ideas?
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> Conference
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> through
> interactions with peers, luminaries and emerging and established companies.
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-- 
If Atheism is a religion, then not collecting stamps is a hobby.