Re: [PyOpenGL-Users] Rolling spectrogram with pyopengl

[René D. <re...@gm...>]

2009/12/11 Ian Mallett <geo...@gm...>:
> Some things definitely change, though--at least they do for me.
>
> Simply replacing "from OpenGL.GL import *" with "from OpenGL.raw.GL import
> *" gives problems.
>
> For example, glGenTextures(1) whines about needing two arguments.  Does it
> want a numpy array or something?
>
> Ian
>

hi,

yeah, the raw ones don't do all the nice pythony things for you.

So using import * from the raw ones is probably not a good idea... but
to instead use it only for the slow, or problematic functions.

In this case glGenTextures is much like the C version.
    void glGenTextures(GLsizei n, GLuint * textures);

So you need to pass it a pointer to some data where it will write your data.

You can see the argument types like this:
    >>> OpenGL.raw.GL.glGenTextures._argtypes_
    (<class 'ctypes.c_long'>, <class 'OpenGL.arrays.arraydatatype.GLuintArray'>)

And give it the array to store a GLuint.
    >>> a = numpy.array([1], numpy.uint32)
    >>> OpenGL.raw.GL.glGenTextures(1, a)


cu,