Shader errors and blank window on Ubuntu Gnome 16.10

[acerspyro]

All the dependencies have been installed correctly.
Installed using pip3 install . --upgrade.
Opens a blank window and throws the same errors multiple times in the terminal.

QOpenGLShaderProgram: could not create shader program
QOpenGLShader: could not create shader
QOpenGLShader: could not create shader
shader compilation failed:
""
QOpenGLShaderProgram::uniformLocation( matrix ): shader program is not linked
QOpenGLShaderProgram::uniformLocation( opacity ): shader program is not linked

[TheLastProject]

Thanks for the report. From my research with you on IRC, this seems to be a bug with the proprietary nvidia driver: https://bugs.launchpad.net/ubuntu/+source/python-qt4/+bug/941826.

Possible workaround seem to be:
spyder-ide/spyder#3226 (comment)

[TheLastProject]

Should be fixed in 41d5b33

[pawamoy]

Still have this error on Debian, shader program is not linked, black window.

[TheLastProject]

Just to confirm, you do have python3-opengl installed?

[pawamoy]

Yup, saw that in the referenced commit and installed it.

[pawamoy]

But in fact, pext still warns me that it is not installed :/

[pawamoy]

Alright, fixed it with sudo pip3 install PyOpenGL!

[TheLastProject]

All of this seems really odd to me, but hey, if it works that's great. So far you're the first person I run into for who installing python3-opengl doesn't work, but I'll make sure to update troubleshooting if I hear more such cases, thanks!

[jean]

$ pip3 install --user pext
$ pext
python3-opengl is not installed. If Pext fails to render, please try installing it. See https://github.com/Pext/Pext/issues/11.
... 

$ sudo apt install python3-opengl
...
$ pext
Traceback (most recent call last):
  File "/home/john/.local/bin/pext", line 7, in <module>
    from pext.__main__ import main
  File "/home/john/.local/lib/python3.5/site-packages/pext/__main__.py", line 75, in <module>
    from OpenGL import GL  # NOQA
  File "/usr/lib/python3/dist-packages/OpenGL/GL/__init__.py", line 3, in <module>
    from OpenGL.GL.VERSION.GL_1_1 import *
  File "/usr/lib/python3/dist-packages/OpenGL/GL/VERSION/GL_1_1.py", line 10, in <module>
    from OpenGL import platform, constants, constant, arrays
  File "/usr/lib/python3/dist-packages/OpenGL/arrays/__init__.py", line 22, in <module>
    formathandler.FormatHandler.loadAll()
  File "/usr/lib/python3/dist-packages/OpenGL/arrays/formathandler.py", line 28, in loadAll
    cls.loadPlugin( entrypoint )
  File "/usr/lib/python3/dist-packages/OpenGL/arrays/formathandler.py", line 35, in loadPlugin
    plugin_class = entrypoint.load()
  File "/usr/lib/python3/dist-packages/OpenGL/plugins.py", line 14, in load
    return importByName( self.import_path )
  File "/usr/lib/python3/dist-packages/OpenGL/plugins.py", line 28, in importByName
    module = __import__( ".".join(moduleName), {}, {}, moduleName)
  File "/usr/lib/python3/dist-packages/OpenGL/arrays/vbo.py", line 430, in <module>
    def mapVBO( vbo, access=GL.GL_READ_WRITE ):
AttributeError: module 'OpenGL.GL' has no attribute 'GL_READ_WRITE'

Pext 0.20
python3-opengl: 3.0.2-1

Running without opengl does actually work, but it doesn't look as pretty as the screenshot.
This also happens with Pext 0.20+13.g1e72ba4

[TheLastProject]

How odd. I'll reopen this as apparently it's not properly fixed then. I assume this means the AppImage won't work for you either, as it ships with pyopengl? I wonder if we can deal with this edge case safely with a try/except around the import. Thanks for your note!

[jean]

I'm on Mint Linux, so I dunno about the AppImage 😬

[TheLastProject]

Well, the AppImage actually runs on any Linux platform. It's a standalone executable.

Anyway, could you check for me if the latest commit I made causes it to work in both cases?

With regards to "but it doesn't look as pretty as the screenshot", a screenshot would be great to be able to tell what seems off :)

[jean]

With the latest commit, the exception is still logged, but pext starts fine.
except Exception as e: is pretty uncool, though. Catching AttributeError should work.
It looks like PyOpenGL 3.1.0 fixes it: wapiflapi/binglide#9 (comment) (it does, I checked)

So maybe something like this would help:

--- a/setup.py
+++ b/setup.py
@@ -54,7 +54,8 @@ setup(
         'dulwich',
         'pynput',
         'pyqt5',
-        'requests'
+        'requests',
+        'PyOpenGL >= 3.1.0'
     ] + extra_deps,

Not making a PR as install doesn't strictly require PyOpenGL ..

[jean]

doesn't look as pretty

It was starting up with a full-width window across my 21" monitor.
But now it's behaving nicely 😁

[TheLastProject]

except Exception as e: is pretty uncool, though.

I understand the concern, but at the same time, the import itself is a workaround. If it doesn't go well, I'd rather Pext just continues launching because it likely will work fine, only certain configs need it

It was starting up with a full-width window across my 21" monitor.

That was fixed in the development version yes :)

[jean]

On Wed, 31 Oct 2018, 18:18 Sylvia van Os, ***@***.***> wrote: except Exception as e: is pretty uncool, though. I understand the concern, but

Yeah in this case it's a matter of aesthetics .. or principle :-]

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