[MacPorts] #71926: OpenGL.error.Error: Attempt to retrieve context when no valid context

[MacPorts]

#71926: OpenGL.error.Error: Attempt to retrieve context when no valid context
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 Reporter:  krotalias                 |      Owner:  (none)
     Type:  defect                    |     Status:  new
 Priority:  Normal                    |  Milestone:
Component:  ports                     |    Version:  2.10.5
 Keywords:  opengl, freeglut, python  |       Port:  py-opengl
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 Python opengl used to work with freeglut. However, now there is a problem
 getting the context. Editing

 /opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10
 /site-packages/OpenGL/platform/ctypesloader.py

 and replacing

 fullName = util.find_library( name ) for

 fullName = "/System/Library/Frameworks/{}.framework/{}".format(name,name)

 as discussed here --
 https://github.com/PixarAnimationStudios/OpenUSD/issues/1372 -- fixes the
 problem.

 The monkeypatch_ctypes approach also works, and one must import it before
 opengl in any code using pyopengl:


 # https://github.com/PixarAnimationStudios/OpenUSD/issues/1372

 #
 /opt/local/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12
 /site-packages/OpenGL/platform/ctypesloader.py

 def monkeypatch_ctypes():
     import os
     import ctypes.util
     uname = os.uname()
     if uname.sysname == "Darwin" and uname.release >= "20.":
         real_find_library = ctypes.util.find_library
         def find_library(name):
             if name in {"OpenGL", "GLUT"}:  # add more names here if
 necessary
                 return
 f"/System/Library/Frameworks/{name}.framework/{name}"
             return real_find_library(name)
         ctypes.util.find_library = find_library
     return

 monkeypatch_ctypes()

 --------------------------------

 The version of the python used is irrelevant. The bug also appears for
 python 3.13
 I tested on macos Catalina and Monterey, because I do not have access to a
 newer Mac.

 Thank you.

-- 
Ticket URL: <https://trac.macports.org/ticket/71926>
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