Unable to load/find OpenGL on MacOS #1372

asierralozano · 2020-10-27T01:36:27Z

Description of Issue

Hello!

I've installed USD on macOS Big Sur with this little fix, and although the build went successfully, as soon as I try to open USDView, it fails to load OpenGL

Traceback (most recent call last):
  File "/opt/local/USD/lib/python/pxr/Usdviewq/stageView.py", line 1632, in paintGL
    from OpenGL import GL
  File "/usr/local/lib/python2.7/site-packages/OpenGL/GL/__init__.py", line 3, in <module>
    from OpenGL import error as _error
  File "/usr/local/lib/python2.7/site-packages/OpenGL/error.py", line 12, in <module>
    from OpenGL import platform, _configflags
  File "/usr/local/lib/python2.7/site-packages/OpenGL/platform/__init__.py", line 36, in <module>
    _load()
  File "/usr/local/lib/python2.7/site-packages/OpenGL/platform/__init__.py", line 33, in _load
    plugin.install(globals())
  File "/usr/local/lib/python2.7/site-packages/OpenGL/platform/baseplatform.py", line 97, in install
    namespace[ name ] = getattr(self,name,None)
  File "/usr/local/lib/python2.7/site-packages/OpenGL/platform/baseplatform.py", line 15, in __get__
    value = self.fget( obj )
  File "/usr/local/lib/python2.7/site-packages/OpenGL/platform/darwin.py", line 62, in GetCurrentContext
    return self.CGL.CGLGetCurrentContext
  File "/usr/local/lib/python2.7/site-packages/OpenGL/platform/baseplatform.py", line 15, in __get__
    value = self.fget( obj )
  File "/usr/local/lib/python2.7/site-packages/OpenGL/platform/darwin.py", line 45, in CGL
    def CGL(self): return self.GL
  File "/usr/local/lib/python2.7/site-packages/OpenGL/platform/baseplatform.py", line 15, in __get__
    value = self.fget( obj )
  File "/usr/local/lib/python2.7/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)

OpenGL is successfully installed. I'm able to import it with no problems on a python interpreter.

System Information (OS, Hardware)

macOS Big Sur Beta 10 (MacOS 11.0 Beta (20A5395g))
MacBookPro 2016 Late (i7)

Package Versions

USD v20.11
PyOpenGL v3.1.5
PySide2 v5.13.2

asierralozano · 2020-10-27T01:55:07Z

It looks like the issue is getting a fix python/cpython#21241
In the meantime, you can fix this issue by editing PyOpenGL file OpenGL/platform/ctypesloader.py, and changing the line

fullName = util.find_library( name )

to

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

meshula · 2020-10-27T02:11:48Z

The fix to finding Python's cached sys dylibs is now tracked on this PR:

python/cpython#22855

It's currently in review.

meshula · 2020-10-27T02:12:19Z

Thanks @asierralozano for finding that!

jilliene · 2020-10-27T20:20:30Z

Filed as internal issue #USD-6450

sosbill · 2020-11-27T11:51:19Z

It looks like the issue is getting a fix python/cpython#21241
In the meantime, you can fix this issue by editing PyOpenGL file OpenGL/platform/ctypesloader.py, and changing the line
fullName = util.find_library( name )
to
fullName = '/System/Library/Frameworks/OpenGL.framework/OpenGL'

thx for answer, but my '/System/Library/Frameworks/OpenGL.framework' doesn't have a file named OpenGL

DanielAmmar · 2020-11-29T15:00:20Z

It looks like the issue is getting a fix python/cpython#21241
In the meantime, you can fix this issue by editing PyOpenGL file OpenGL/platform/ctypesloader.py, and changing the line
fullName = util.find_library( name )
to
fullName = '/System/Library/Frameworks/OpenGL.framework/OpenGL'
thx for answer, but my '/System/Library/Frameworks/OpenGL.framework' doesn't have a file named OpenGL

You don't actually need the binary there, just change the fullName variable as suggested.

AnaLarralde · 2020-12-10T19:43:24Z

It worked perfectly!! (mind the indentation when changing the line!!)
Thank you very much!

grapegrap · 2020-12-16T21:32:09Z

I tried this fix but still get the same error as before. Any suggestions? Thanks!

The code:

anjok · 2020-12-26T10:13:16Z

better use

"""Load a given library for Windows systems

returns the ctypes C-module object
"""
fullName = "/System/Library/Frameworks/{}.framework/{}".format(name,name)

instead, as otherwise GLUT won't load.

zyf674 · 2020-12-29T16:57:55Z

Can anyone tell me where is this file OpenGL/platform/ctypesloader.py? I'm not able to locate it on my Mac

birdsofbluesky · 2021-01-06T16:07:59Z

Can anyone tell me where is this file OpenGL/platform/ctypesloader.py? I'm not able to locate it on my Mac

@zyf674 this worked for me

find / -name ctypesloader.py 2>/dev/null

asierralozano · 2021-01-20T10:51:06Z

It looks like they have fixed this issue on the latest USD release! (21.02)

MattSingbeil · 2021-03-19T22:16:09Z

I had the same issue but it also persisted with the GLUT framework as well. Below was my work around piggy backing off of suggested edits here.

# fullName = util.find_library( name )
if "opengl" in name.lower():
    fullName = '/System/Library/Frameworks/OpenGL.framework/OpenGL'
elif "glut" in name.lower():
    fullName = '/System/Library/Frameworks/GLUT.framework/GLUT'
else:
    fullName = util.find_library( name )

pengzhouzp · 2021-03-30T05:47:00Z

It looks like the issue is getting a fix python/cpython#21241
In the meantime, you can fix this issue by editing PyOpenGL file OpenGL/platform/ctypesloader.py, and changing the line
fullName = util.find_library( name )
to
fullName = '/System/Library/Frameworks/OpenGL.framework/OpenGL'

Hi, I cannot find the ctypesloader.py by find . -name 'ctypesloader.py', thank you for the help!

YMVio · 2021-04-01T20:01:02Z

It looks like the issue is getting a fix python/cpython#21241
In the meantime, you can fix this issue by editing PyOpenGL file OpenGL/platform/ctypesloader.py, and changing the line
fullName = util.find_library( name )
to
fullName = '/System/Library/Frameworks/OpenGL.framework/OpenGL'
Hi, I cannot find the ctypesloader.py by find . -name 'ctypesloader.py', thank you for the help!

Hi, you just need type "ctypesloader.py" in Spotlight Search.

pifparfait · 2021-04-14T11:25:26Z

This works for me. Thanks

rollcat · 2021-04-20T12:16:57Z

Another option, if you can't (or don't want to) patch the library source, you can monkey-patch the stdlib ctypes library:

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

komms · 2021-09-01T08:25:42Z

Can anyone tell me where is this file OpenGL/platform/ctypesloader.py? I'm not able to locate it on my Mac

It should be here: ~/anaconda3/lib/python3.8/site-packages/OpenGL

luca992 · 2021-09-03T04:55:07Z

Another option, if you can't (or don't want to) patch the library source, you can monkey-patch the stdlib ctypes library:

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

This is exactly what I needed. 👍

IvanLiuTW · 2022-04-07T02:38:07Z

@asierralozano
The post helped solve my failing import issue.
Thank you!

coreyjadams · 2022-04-26T21:29:00Z

@luca992 You are the hero I needed today, thank you for this monkey patch from last year!

This solved my issues on Monterey using system Python 3.7.3, and a virtualenv where I install PyOpenGL.

physicist90 · 2022-12-30T05:41:39Z

IGNORE ALL OF THESE

JUST RUN THIS: pip install PyOpenGL PyOpenGL_accelerate

asierralozano changed the title ~~Unable to load OpenGL on MacOS~~ Unable to load/find OpenGL on MacOS Oct 27, 2020

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Unable to load/find OpenGL on MacOS #1372

Unable to load/find OpenGL on MacOS #1372

asierralozano commented Oct 27, 2020 •

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asierralozano commented Oct 27, 2020

meshula commented Oct 27, 2020

meshula commented Oct 27, 2020

jilliene commented Oct 27, 2020

sosbill commented Nov 27, 2020

DanielAmmar commented Nov 29, 2020

AnaLarralde commented Dec 10, 2020

grapegrap commented Dec 16, 2020 •

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anjok commented Dec 26, 2020 •

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zyf674 commented Dec 29, 2020

birdsofbluesky commented Jan 6, 2021

asierralozano commented Jan 20, 2021

MattSingbeil commented Mar 19, 2021

pengzhouzp commented Mar 30, 2021 •

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YMVio commented Apr 1, 2021

pifparfait commented Apr 14, 2021

rollcat commented Apr 20, 2021 •

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komms commented Sep 1, 2021

luca992 commented Sep 3, 2021

IvanLiuTW commented Apr 7, 2022

coreyjadams commented Apr 26, 2022

physicist90 commented Dec 30, 2022

Unable to load/find OpenGL on MacOS #1372

Unable to load/find OpenGL on MacOS #1372

Comments

asierralozano commented Oct 27, 2020 • edited Loading

Description of Issue

System Information (OS, Hardware)

Package Versions

asierralozano commented Oct 27, 2020

meshula commented Oct 27, 2020

meshula commented Oct 27, 2020

jilliene commented Oct 27, 2020

sosbill commented Nov 27, 2020

DanielAmmar commented Nov 29, 2020

AnaLarralde commented Dec 10, 2020

grapegrap commented Dec 16, 2020 • edited Loading

anjok commented Dec 26, 2020 • edited Loading

zyf674 commented Dec 29, 2020

birdsofbluesky commented Jan 6, 2021

asierralozano commented Jan 20, 2021

MattSingbeil commented Mar 19, 2021

pengzhouzp commented Mar 30, 2021 • edited Loading

YMVio commented Apr 1, 2021

pifparfait commented Apr 14, 2021

rollcat commented Apr 20, 2021 • edited Loading

komms commented Sep 1, 2021

luca992 commented Sep 3, 2021

IvanLiuTW commented Apr 7, 2022

coreyjadams commented Apr 26, 2022

physicist90 commented Dec 30, 2022

asierralozano commented Oct 27, 2020 •

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grapegrap commented Dec 16, 2020 •

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anjok commented Dec 26, 2020 •

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pengzhouzp commented Mar 30, 2021 •

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