Re: [PyOpenGL-Users] VBOs and gl*Pointer offset parameter

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

renaud blanch wrote:
> On Thu, Jul 16, 2009 at 8:32 PM, Mike C. Fletcher<mcf...@vr...> wrote:
>   
...
>>    ctypes.c_void_p( 12 )
>>
>> should work as an array offset of 12 bytes,
...
> no, it does not work (at least for me).
> that's what i was also doing.
>   
Argh.  ctypes c_void_p is a parameter type, not a pointer type (I knew
this, but I mis-coded for it).  I've checked a 2-line patch into the
OpenGL.arrays.ctypesparameters file, it should show up in the next
release (which should happen reasonably soon, if I ever get enough time
to test).  In the meantime, the following patch should work, or you
could use bzr head of PyOpenGL.

HTH,
Mike

=== modified file 'OpenGL/arrays/ctypesparameters.py'
--- OpenGL/arrays/ctypesparameters.py   2009-04-09 19:06:55 +0000
+++ OpenGL/arrays/ctypesparameters.py   2009-07-17 18:21:38 +0000
@@ -30,7 +30,7 @@
                        return ctypes.byref( value )
        from_param = voidDataPointer = classmethod( from_param )
        def dataPointer( cls, value ):
-               if isinstance( value, ParamaterType ):
+               if isinstance( value, DIRECT_RETURN_TYPES ):
                        return value
                else:
                        return ctypes.addressof( value )
@@ -95,6 +95,8 @@
                                yield length
        def asArray( self, value, typeCode=None ):
                """Convert given value to an array value of given
typeCode"""
+               if isinstance( value, DIRECT_RETURN_TYPES ):
+                       return value
                if isinstance( value, ParamaterType ):
                        value = value._obj
                return ctypes.byref( value )

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