Re: pyopengl and pypy

i'm back with some progress.
got some help from pypy-dev:


1) the first issue (missing ctypes.pythonapi) was solved with the help of
pypy-dev. they suggested to replace the c functions by a pure ctype 
implementation (and not worry and the memory layout, since their ctypes module 
does "the right thing"):

PyString_asString can be avoided in OpenGL/array.string.py by using
    def dataPointer(value):
        return ctypes.cast(ctypes.create_string_buffer(value),
                           ctypes.c_void_p).value
or 
    def dataPointer(value):
        return ctypes.cast(ctypes.c_char_p(value), ctypes.c_void_p).value

PyBuffer_FromMemory can be implemented as (not tested though, since it's 
only used in experimental code for vbos):
    def PyBuffer_FromMemory(address, length):
        return buffer((ctypes.c_char * length).from_address(address))

if you want, i can provide a patch for those changes. in my tree of PyOpenGL i
have totally removed the references to ctypes.pythonapi and it uses the ctypes
version even for cpython. you might prefer to keep your implementation and just
add a fallback if ctypes.pythonapi is None.

the whole thread is there for reference:
<http://codespeak.net/pipermail/pypy-dev/2010q4/006452.html>


2) the second issue (missing _CDada_intput) is from pypy. the good news is that 
it has already been fixed by Amaury Forgeot d'Arc in the fast-forward branch 
(aiming at cpython 2.7 compatibility). the patch (requires some adaptation to 
apply on pypy-1.4) can be found there:
<http://codespeak.net/pipermail/pypy-svn/2010-November/045106.html>


so far, i have managed to partially run the programs of my small opengl 
tutorial, i.e. a sample program that use most of the functionalities of the
fixed pipeline and that is evolved step by step into a shader based 
implementation. what runs for the moment (with minor errors):
- 01-direct.py (direct rendering, some geometry + 3d texture)
- 02-displaylist.py
- 03-array.py (use of Vertex/.../NormalPointer)
- 04-vbo.py (idem + VBOs to pass the data)
what does not run: the rest that uses shaders, but i'm pretty confident it's a
minor issue (wrong types in glShaderSource arguments)

the programs are based on pyopengl and can be found here:
<http://bitbucket.org/rndblnch/opengl-programmable/>




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