glcube.py OpenGL.error.Error: Attempt to retrieve context when no valid context (3110)

[GalacticEmperor1]

Issue №3110 opened by brccabral at 2022-04-01 18:47:34

Hi, I am getting this error trying to run examples/glcube.py. Any ideas?

Ubuntu 20.04 pygame 2.1.2 (SDL 2.0.16, Python 3.8.10)

python glcube.py          
pygame 2.1.2 (SDL 2.0.16, Python 3.8.10)
Hello from the pygame community. https://www.pygame.org/contribute.html

Traceback (most recent call last):
  File "glcube.py", line 591, in <module>
    main()
  File "glcube.py", line 544, in main
    gpu, f_indices, o_indices = init_gl_modern(display_size)
  File "glcube.py", line 409, in init_gl_modern
    GL.glVertexAttribPointer(loc, 3, GL.GL_FLOAT, False, stride, offset)
  File "/media/Data/PythonProjects/Games/.venv/lib/python3.8/site-packages/OpenGL/latebind.py", line 63, in __call__
    return self.wrapperFunction( self.baseFunction, *args, **named )
  File "/media/Data/PythonProjects/Games/.venv/lib/python3.8/site-packages/OpenGL/GL/VERSION/GL_2_0.py", line 469, in glVertexAttribPointer
    contextdata.setValue( key, array )
  File "/media/Data/PythonProjects/Games/.venv/lib/python3.8/site-packages/OpenGL/contextdata.py", line 58, in setValue
    context = getContext( context )
  File "/media/Data/PythonProjects/Games/.venv/lib/python3.8/site-packages/OpenGL/contextdata.py", line 40, in getContext
    raise error.Error(
OpenGL.error.Error: Attempt to retrieve context when no valid context

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Comments

*MyreMylar commented at 2022-04-02 07:30:24*

Anything else odd about your setup? Are you running pygame remotely, in a container on a separate thread? Apparently this error crops up when GL can't access the main thread/display.

The example runs on main right now on windows:

This is pygame 2.1.3.dev5 (SDL 2.0.20, Python 3.9.0)

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*SiddhantRanade commented at 2022-04-13 02:26:31*

I'm facing the exact same issue when running pygame on Ubuntu 20.04 (WSL2 fresh install) within WSL2 on Windows 11. I verified that glxgears works.

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*brccabral commented at 2022-04-13 21:30:44*

Hi @MyreMylar , it is the same problem as # 3114 , on Wayland I get the error, on Xorg it runs OK.

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*thisistejaspandey commented at 2022-06-15 02:27:55*

Same issue! Please escalate!!!!

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*anji993 commented at 2022-06-30 10:25:14*

I'm facing the exact same issue when running pygame on Ubuntu 20.04 (WSL2 fresh install) within WSL2 on Windows 11. I verified that glxgears works.

Hi @SiddhantRanade have you solved this problem? I meet the same problem as yours!

[MyreMylar]

I wonder if all these reports were related to GL setup on WSL2 ?

See: https://stackoverflow.com/questions/66497147/cant-run-opengl-on-wsl2

I've tested and I can definitely run the glcube example on linux on my raspberry pi - though the Pi only supports up to openGL 3.1 from what I've read so you need to set the USE_MODERN_GL flag in the example to false.

[MyreMylar]

OK, I've spent some time getting WLSL setup on my PC with Ubuntu 20.04.

There have been lots of developments since this was originally posted making the whole process a lot easier. I didn't have to export anything or even use VcxSrv

There is now a native XServer included with WLSL since January of this year. This works, but there are clearly still some bugs being worked out as you see a lot of segmentation faults even when running basic diagnostic utilities like:

sudo glxinfo -B

...and when exiting pygame gl apps. I found lots of issue reports to Microsoft about this already so there wasn't much for me to add.

However, despite those it still works reasonably well for what is a pretty niche pygame use case

I also noticed that with the x11 driver you need to set the glcube example to:

USE_MODERN_GL = False

...then it works fine.

x11 driver:

But with the wayland video driver enabled you can have your modern GL and eat it too:

# add this near the top, before pygame.init()
os.environ['SDL_VIDEODRIVER'] = 'wayland'

...

USE_MODERN_GL = True

Wayland driver:

Anyway, overall this is still a bit of a pain to get setup, but most of that is setting up WLSL for python and openGL not really anything to do with pygame-ce. I don't think there was ever anything for us to do here, it is just WLSL slowly improving their compatibility.