[MacPorts] #71926: py-opengl: OpenGL.error.Error: Attempt to retrieve context when no valid context (was: OpenGL.error.Error: Attempt to retrieve context when no valid context)

[MacPorts]

#71926: py-opengl: OpenGL.error.Error: Attempt to retrieve context when no valid
context
------------------------+----------------------
  Reporter:  krotalias  |      Owner:  jmroot
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.10.5
Resolution:             |   Keywords:
      Port:  py-opengl  |
------------------------+----------------------
Changes (by ryandesign):

 * status:  new => assigned
 * cc: jmroot (removed)
 * keywords:  opengl, freeglut, python =>
 * owner:  (none) => jmroot


Old description:

> 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.

New description:

 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#comment:1>
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