Re: [PyOpenGL-Users] glGetUniformIndices

[Mike C. F. <mcf...@vr...>]

On 12-01-16 12:32 PM, Hans Wurst wrote:
> Hi guys,
>
> I've written the following wrapper-code for glGetUniformIndices:
>
> @lazy( glGetUniformIndices )
> def glGetUniformIndices(baseOperation, program, uniformNames):
>     num = len(uniformNames)
>     maxLen = max([len(x) for x in uniformNames])+1
>     names = ((ctypes.c_char * maxLen) * num)()
I believe you want ctypes.c_char_p * num here, with this formulation 
you'd then need to create a new array of pointers each of which was 
pointing at the beginning of the row for that value.  Don't have a 
test-case handy to test that assumption, though.
>     for i,name in enumerate(uniformNames):
>         names[i].value = name
>     c_names = ctypes.cast(ctypes.pointer(ctypes.pointer(names)),
>                           
> ctypes.POINTER(ctypes.POINTER(OpenGL.constants.GLchar)))
>     obuff = (ctypes.c_uint32 * num)()
>     print ctypes.byref(obuff)
>     print c_names
>     print "Before", baseOperation.__name__
>     baseOperation(program, num, c_names, ctypes.byref(obuff))
>     print "After", baseOperation.__name__
>     return [o.value for o in obuff]
HTH,
Mike

-- 
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   Mike C. Fletcher
   Designer, VR Plumber, Coder
   http://www.vrplumber.com
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