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

[René D. <re...@gm...>]

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,