[ pyopengl-Bugs-3534110 ] hasGLExtension fail wrt circular import

Bugs item #3534110, was opened at 2012-06-10 03:02
Message generated for change (Settings changed) made by mcfletch
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Category: GL
Group: v3.0.0
Status: Open
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Alexander Sabourenkov (lxnt)
Assigned to: Mike C. Fletcher (mcfletch)
Summary: hasGLExtension fail wrt circular import

Initial Comment:
Given a 3.0+ forward-compatible context, that is, with glGetString barking at GL_EXTENSIONS, "from OpenGL.GL import *" may fail if one of OpenGL.GL.VERSION.GL_* submodules with version below 3.0  calls hasGLExtension() due to the fact that until "from OpenGL.GL.VERSION.GL_3_0 import *" line is executed in OpenGL/GL/__init__.py, the line "from OpenGL.GL import GL_NUM_EXTENSIONS, glGetStringi, glGetIntegerv" is guaranteed to throw an ImportError.

Suggested solution:

replace the aforementioned import statement in the hasExtension() function with the following two lines:

                from OpenGL.GL.VERSION.GL_3_0 import GL_NUM_EXTENSIONS, glGetStringi
                from OpenGL.GL import glGetIntegerv

Works for me.

Attached patch: the above fix plus a couple of nits to make it all work under Python 3.2



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>Comment By: Mike C. Fletcher (mcfletch)
Date: 2012-06-10 19:33

Message:
I've merged approximately this patch in.

I reverted the "as" changes, as I don't believe I've ever officially
announced dropping support for Python 2.5 (though I likely should some day
soon).  The change that would break unicode string checking on Python 2.x
was also not included (AFAIK that code would work perfectly well on Python
3.x); there was a real reason to say "string or unicode" there.  I had to
add an alias for the __bool__ as well so that earlier Python's would still
be able to do boolean checking.

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