NoSuchConfigException while importing p5 on Raspbian

[friedkeenan]

Here's the whole error:

Traceback (most recent call last):
  File "/usr/local/lib/python3.5/site-packages/p5/sketch/base.py", line 50, in <module>
    config = screen.get_best_config(template)
  File "/usr/local/lib/python3.5/site-packages/pyglet/canvas/base.py", line 161, in get_best_config
    raise window.NoSuchConfigException()
pyglet.window.NoSuchConfigException

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test.py", line 1, in <module>
    from p5 import *
  File "/usr/local/lib/python3.5/site-packages/p5/__init__.py", line 19, in <module>
    from .sketch import *
  File "/usr/local/lib/python3.5/site-packages/p5/sketch/__init__.py", line 19, in <module>
    from .base import *
  File "/usr/local/lib/python3.5/site-packages/p5/sketch/base.py", line 53, in <module>
    config = screen.get_best_config(template)
  File "/usr/local/lib/python3.5/site-packages/pyglet/canvas/base.py", line 161, in get_best_config
    raise window.NoSuchConfigException()
pyglet.window.NoSuchConfigException

I've tried all I can to fix it, I've searched for hours, I've enabled the experimental OpenGL drivers, I reinstalled everything involved in p5, all the standard stuff. I know you probably can't fix this, since it's probably a problem with Raspbian, but I just wanted to let you know.

[abhikpal]

The only reason I could think of is that Pyglet can't find the required OpenGL config on Raspbian. I still don't know why this could be happening, though. The following lines in p5/sketch/base.py should account for this (I think?):

template = pyglet.gl.Config(samples_buffers=1, samples=2)
try:
    config = screen.get_best_config(template)
except pyglet.window.NoSuchConfigException:
    template = pyglet.gl.Config()
    config = screen.get_best_config(template)

In general it would be nice to have Raspbian support, so let's keep this open as an issue for now in case someone wants to take this up.

[friedkeenan]

Ok, so I looked at the pyglet example scripts, which work on Raspbian, and I noticed that they do a few things different in initializing the config for the window.

In graphics.py, they have double_buffer set to true when they initialize the config.

In sketch/base.py, you have

template = pyglet.gl.Config(samples_buffers=1, samples=2)

So, I changed it to this:

template = pyglet.gl.Config(samples_buffers=1, samples=2,double_buffer=True)

And that seems to work. I don't know if this affects other areas of the code or other OSes, but at least I got it working I guess

EDIT: It doesn't require the experimental GL drivers either

[abhikpal]

Is this still an issue with the latest release?

[friedkeenan]

I can now import the library, but if I do run() it creates a segmentation fault

[abhikpal]

Assuming you have installed vispy as a dependency (while installing p5), can you try running this:

import vispy
print(vispy.sys_info())

[friedkeenan]

Platform: Linux-4.9.35-v7+-armv7l-with-debian-8.0
Python:   3.5.2 (default, Dec 31 2017, 03:57:45)  [GCC 4.9.2]
NumPy:    1.13.3
Backend:  Pyglet
pyqt4:    None
pyqt5:    None
pyside:   None
pyglet:   pyglet 1.3.0
glfw:     glfw (3, 0, 4)
sdl2:     None
wx:       None
egl:      EGL 1.4 (DRI2) Mesa Project: OpenGL OpenGL_ES
osmesa:   None
_test:    None

App info-gathering error:
Traceback (most recent call last):
  File "/usr/local/lib/python3.5/site-packages/vispy/util/config.py", line 432, in sys_info
    canvas = Canvas('Test', (10, 10), show=False, app=app)
  File "/usr/local/lib/python3.5/site-packages/vispy/app/canvas.py", line 205, in __init__
    self.create_native()
  File "/usr/local/lib/python3.5/site-packages/vispy/app/canvas.py", line 222, in create_native
    self._app.backend_module.CanvasBackend(self, **self._backend_kwargs)
  File "/usr/local/lib/python3.5/site-packages/vispy/app/backends/_pyglet.py", line 211, in __init__
    screen=self._vispy_screen)
  File "/usr/local/lib/python3.5/site-packages/pyglet/window/xlib/__init__.py", line 166, in __init__
    super(XlibWindow, self).__init__(*args, **kwargs)
  File "/usr/local/lib/python3.5/site-packages/pyglet/window/__init__.py", line 520, in __init__
    config = screen.get_best_config(config)
  File "/usr/local/lib/python3.5/site-packages/pyglet/canvas/base.py", line 161, in get_best_config
    raise window.NoSuchConfigException()
pyglet.window.NoSuchConfigException

It seems to be the same error as before