Does not run on osx big sur

When following this install tutorial and I get to the final step I get a stack trace with the following.

Traceback (most recent call last):
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/platform/darwin.py", line 35, in GL
    return ctypesloader.loadLibrary(
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/platform/ctypesloader.py", line 36, in loadLibrary
    return _loadLibraryWindows(dllType, name, mode)
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/platform/ctypesloader.py", line 89, in _loadLibraryWindows
    return dllType( name, mode )
  File "/usr/local/Cellar/python@3.9/3.9.0_3/Frameworks/Python.framework/Versions/3.9/lib/python3.9/ctypes/__init__.py", line 374, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: ('dlopen(OpenGL, 10): image not found', 'OpenGL', None)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/owencraston/src/personal/python/coldtype/venv/bin/coldtype", line 33, in <module>
    sys.exit(load_entry_point('coldtype', 'console_scripts', 'coldtype')())
  File "/Users/owencraston/src/personal/python/coldtype/venv/bin/coldtype", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/usr/local/Cellar/python@3.9/3.9.0_3/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/metadata.py", line 77, in load
    module = import_module(match.group('module'))
  File "/usr/local/Cellar/python@3.9/3.9.0_3/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 790, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "/Users/owencraston/src/personal/python/coldtype/coldtype/renderer/__init__.py", line 31, in <module>
    from OpenGL import GL
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/GL/__init__.py", line 3, in <module>
    from OpenGL import error as _error
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/error.py", line 12, in <module>
    from OpenGL import platform, _configflags
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/platform/__init__.py", line 36, in <module>
    _load()
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/platform/__init__.py", line 33, in _load
    plugin.install(globals())
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/platform/baseplatform.py", line 97, in install
    namespace[ name ] = getattr(self,name,None)
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/platform/baseplatform.py", line 15, in __get__
    value = self.fget( obj )
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/platform/darwin.py", line 62, in GetCurrentContext
    return self.CGL.CGLGetCurrentContext
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/platform/baseplatform.py", line 15, in __get__
    value = self.fget( obj )
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/platform/darwin.py", line 45, in CGL
    def CGL(self): return self.GL
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/platform/baseplatform.py", line 15, in __get__
    value = self.fget( obj )
  File "/Users/owencraston/src/personal/python/coldtype/venv/lib/python3.9/site-packages/OpenGL/platform/darwin.py", line 41, in GL
    raise ImportError("Unable to load OpenGL library", *err.args)
ImportError: ('Unable to load OpenGL library', 'dlopen(OpenGL, 10): image not found', 'OpenGL', None)

This could very well be an issue with big sir but I thought i’d bring it up. I’m not exactly sure how to fix this since it seems like Opengl is deprecated on osx

I am running OSX 11.0.1

[stenson]

also worth noting that without the [viewer] extra, coldtype doesn’t attempt to install any GL packages (glfw, OpenGl, skia-python), so the workaround might still be an issue but won’t come into play yet, unless you do append the [viewer] extra to the install line

[dubajj]

I ran into this same issue, it looks like its an issue in Python ctypes find_library that has already been fixed but not released. Here is a relevant stack overflow mention of this same problem: https://stackoverflow.com/questions/63475461/unable-to-import-opengl-gl-in-python-on-macos and it looks like bpo-41100: Support macOS 11 and Apple Silicon was merged a couple of days ago into python:master so that should be rolling out into a release pretty soonish.

Here is the rough work-around for the moment: in venv/lib/python3.9/site-packages/OpenGL/platform/ctypesloader.py change line 79 from fullName = util.find_library( name )

to

fullName = '/System/Library/Frameworks/OpenGL.framework/OpenGL';

Being on the bleeding edge OS wise means we hit some bumps of course as everyone else plays catch up along side. In this case we just have to wait a little bit for Python to fix this (the change above is NOT the fix its just a workaround)

When they drop an updated python with this fix be sure to delete and regenerate your venv.

Cheers!