Re: [PyOpenGL-Users] Using glDrawElements on C-allocated data

[René D. <re...@gm...>]

Seems to be some ctypes wrappers here:
http://svn.python.org/projects/ctypes/trunk/ctypeslib/ctypeslib/contrib/pythonhdr.py

For the PyBuffer_FromReadWriteMemory function.  If you don't want to
use a C module for it.


cu,


On Wed, Jun 3, 2009 at 9:01 PM, René Dudfield <re...@gm...> wrote:
> On Wed, Jun 3, 2009 at 8:53 PM, Gordon L. Kindlmann <gl...@uc...> wrote:
>> Hello,
>>
>> I'm aware that most users of PyOpenGL are creating their arrays on the
>> python side.
>>
>> In my case, I'd like to make use of a large set of pre-existing C libraries,
>> which do what they do very well, and do it rapidly.  This includes
>> extracting features from scientific data, and representing them as polydata,
>> which I'd like to visualize from python.  Creating the buffers in python is
>> not an option for me.  Copying the data into a python array, just so I can
>> hand it back to PyOpenGL, which in turn goes back through ctypes to give it
>> OpenGL, is going to incur a memory and performance cost that should be
>> avoided.
>
> sure, but can those libraries let you pass in your own allocated data?
>  Or are they not extensible in that way?  Many C libraries let you
> allocate the memory yourself, is why I asked.
>
> but, if you don't want to do it that way, or can't then you can create
> a buffer from a pointer+size, and then use it.
>
>
> cheers,
>