napari: RuntimeError: Using glBindFramebuffer with no OpenGL context.

🐛 Bug

When I drop a png file into the viewer, I get the following error. If I reboot my windows 10 machine, sometimes this error won’t occur, but in most cases, it will.

The version is 0.4.17rc4, but I tried 0.4.8 and it also errored.

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\gloo\gl\_gl2.py:53, in glBindFramebuffer(target=GL_FRAMEBUFFER, framebuffer=1)
     52 try:
---> 53     nativefunc = glBindFramebuffer._native
     54 except AttributeError:

AttributeError: 'function' object has no attribute '_native'

During handling of the above exception, another exception occurred:

AttributeError                            Traceback (most recent call last)
File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\gloo\gl\gl2.py:70, in _get_gl_func(name='glBindFramebuffer', restype=None, argtypes=(<class 'ctypes.c_ulong'>, <class 'ctypes.c_ulong'>))
     68 try:
     69     # Try using normal ctypes stuff
---> 70     func = getattr(_lib, name)
        _lib = <WinDLL 'opengl32', handle 7ffc9cc50000 at 0x1e8d26694c0>
        name = 'glBindFramebuffer'
     71     func.restype = restype

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\ctypes\__init__.py:386, in CDLL.__getattr__(self=<WinDLL 'opengl32', handle 7ffc9cc50000>, name='glBindFramebuffer')
    385     raise AttributeError(name)
--> 386 func = self.__getitem__(name)
        name = 'glBindFramebuffer'
        self = <WinDLL 'opengl32', handle 7ffc9cc50000 at 0x1e8d26694c0>
    387 setattr(self, name, func)

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\ctypes\__init__.py:391, in CDLL.__getitem__(self=<WinDLL 'opengl32', handle 7ffc9cc50000>, name_or_ordinal='glBindFramebuffer')
    390 def __getitem__(self, name_or_ordinal):
--> 391     func = self._FuncPtr((name_or_ordinal, self))
        self._FuncPtr = <class 'ctypes.CDLL.__init__.<locals>._FuncPtr'>
        (name_or_ordinal, self) = ('glBindFramebuffer', <WinDLL 'opengl32', handle 7ffc9cc50000 at 0x1e8d26694c0>)
        name_or_ordinal = 'glBindFramebuffer'
        self = <WinDLL 'opengl32', handle 7ffc9cc50000 at 0x1e8d26694c0>
    392     if not isinstance(name_or_ordinal, int):

AttributeError: function 'glBindFramebuffer' not found

During handling of the above exception, another exception occurred:

RuntimeError                              Traceback (most recent call last)
File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\app\backends\_qt.py:903, in CanvasBackendDesktop.paintGL(self=<vispy.app.backends._qt.CanvasBackendDesktop(0x1e8d70e4d30)>)
    901 # (0, 0, self.width(), self.height()))
    902 self._vispy_canvas.set_current()
--> 903 self._vispy_canvas.events.draw(region=None)
        self._vispy_canvas = <VispyCanvas (PySide2) at 0x1e8d9748640>
        self._vispy_canvas.events.draw = <vispy.util.event.EventEmitter object at 0x000001E8D975B2E0>
        self = <vispy.app.backends._qt.CanvasBackendDesktop(0x1e8d70e4d30) at 0x000001E8D970B580>
        self._vispy_canvas.events = <vispy.util.event.EmitterGroup object at 0x000001E8D975B250>
    905 # Clear the alpha channel with QOpenGLWidget (Qt >= 5.4), otherwise the
    906 # window is translucent behind non-opaque objects.
    907 # Reference:  MRtrix3/mrtrix3#266
    908 if QT5_NEW_API or PYSIDE6_API or PYQT6_API:

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\util\event.py:453, in EventEmitter.__call__(self=<vispy.util.event.EventEmitter object>, *args=(), **kwargs={'region': None})
    450 if self._emitting > 1:
    451     raise RuntimeError('EventEmitter loop detected!')
--> 453 self._invoke_callback(cb, event)
        event = <DrawEvent blocked=False handled=False native=None region=None source=None sources=[] type=draw>
        self = <vispy.util.event.EventEmitter object at 0x000001E8D975B2E0>
        cb = <bound method SceneCanvas.on_draw of <VispyCanvas (PySide2) at 0x1e8d9748640>>
    454 if event.blocked:
    455     break

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\util\event.py:471, in EventEmitter._invoke_callback(self=<vispy.util.event.EventEmitter object>, cb=<bound method SceneCanvas.on_draw of <VispyCanvas (PySide2)>>, event=<DrawEvent blocked=False handled=False native=None region=None source=None sources=[] type=draw>)
    469     cb(event)
    470 except Exception:
--> 471     _handle_exception(self.ignore_callback_errors,
        self = <vispy.util.event.EventEmitter object at 0x000001E8D975B2E0>
        cb = <bound method SceneCanvas.on_draw of <VispyCanvas (PySide2) at 0x1e8d9748640>>
        event = <DrawEvent blocked=False handled=False native=None region=None source=None sources=[] type=draw>
        (cb, event) = (<bound method SceneCanvas.on_draw of <VispyCanvas (PySide2) at 0x1e8d9748640>>, <DrawEvent blocked=False handled=False native=None region=None source=None sources=[] type=draw>)
    472                       self.print_callback_errors,
    473                       self, cb_event=(cb, event))

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\util\event.py:469, in EventEmitter._invoke_callback(self=<vispy.util.event.EventEmitter object>, cb=<bound method SceneCanvas.on_draw of <VispyCanvas (PySide2)>>, event=<DrawEvent blocked=False handled=False native=None region=None source=None sources=[] type=draw>)
    467 def _invoke_callback(self, cb, event):
    468     try:
--> 469         cb(event)
        cb = <bound method SceneCanvas.on_draw of <VispyCanvas (PySide2) at 0x1e8d9748640>>
        event = <DrawEvent blocked=False handled=False native=None region=None source=None sources=[] type=draw>
    470     except Exception:
    471         _handle_exception(self.ignore_callback_errors,
    472                           self.print_callback_errors,
    473                           self, cb_event=(cb, event))

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\scene\canvas.py:218, in SceneCanvas.on_draw(self=<VispyCanvas (PySide2)>, event=<DrawEvent blocked=False handled=False native=None region=None source=None sources=[] type=draw>)
    215 # Now that a draw event is going to be handled, open up the
    216 # scheduling of further updates
    217 self._update_pending = False
--> 218 self._draw_scene()
        self = <VispyCanvas (PySide2) at 0x1e8d9748640>

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\scene\canvas.py:277, in SceneCanvas._draw_scene(self=<VispyCanvas (PySide2)>, bgcolor=<class 'numpy.ndarray'> (4,) float32)
    275     bgcolor = self._bgcolor
    276 self.context.clear(color=bgcolor, depth=True)
--> 277 self.draw_visual(self.scene)
        self = <VispyCanvas (PySide2) at 0x1e8d9748640>

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\scene\canvas.py:315, in SceneCanvas.draw_visual(self=<VispyCanvas (PySide2)>, visual=<SubScene>, event=None)
    313         else:
    314             if hasattr(node, 'draw'):
--> 315                 node.draw()
        node = <Image at 0x1e8e2fafb20>
    316                 prof.mark(str(node))
    317 else:

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\scene\visuals.py:103, in VisualNode.draw(self=<Image>)
    101 if self.picking and not self.interactive:
    102     return
--> 103 self._visual_superclass.draw(self)
        self = <Image at 0x1e8e2fafb20>
        self._visual_superclass = <class 'vispy.visuals.image.ImageVisual'>

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\visuals\visual.py:451, in Visual.draw(self=<Image>)
    449 self._configure_gl_state()
    450 try:
--> 451     self._program.draw(self._vshare.draw_mode,
        self._vshare.draw_mode = 'triangles'
        self = <Image at 0x1e8e2fafb20>
        self._vshare = <vispy.visuals.visual.VisualShare object at 0x000001E8E2FC9400>
        self._program = <vispy.visuals.shaders.program.ModularProgram object at 0x000001E8E2FE9190>
        self._vshare.index_buffer = None
    452                        self._vshare.index_buffer)
    453 except Exception:
    454     logger.warning("Error drawing visual %r" % self)

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\visuals\shaders\program.py:102, in ModularProgram.draw(self=<vispy.visuals.shaders.program.ModularProgram object>, *args=('triangles', None), **kwargs={})
    100 self.build_if_needed()
    101 self.update_variables()
--> 102 Program.draw(self, *args, **kwargs)
        self = <vispy.visuals.shaders.program.ModularProgram object at 0x000001E8E2FE9190>
        args = ('triangles', None)
        kwargs = {}

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\gloo\program.py:526, in Program.draw(self=<vispy.visuals.shaders.program.ModularProgram object>, mode='triangles', indices=None, check_error=True)
    522     raise TypeError("Invalid index: %r (must be IndexBuffer)" %
    523                     indices)
    525 # Process GLIR commands
--> 526 canvas.context.flush_commands()
        canvas = <VispyCanvas (PySide2) at 0x1e8d9748640>

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\gloo\context.py:171, in GLContext.flush_commands(self=<GLContext>, event=None)
    169     else:
    170         fbo = 0
--> 171     self.shared.parser.parse([('CURRENT', 0, fbo)])
        self = <GLContext at 0x1e8d975b220>
        fbo = 1
        [('CURRENT', 0, fbo)] = [('CURRENT', 0, 1)]
        ('CURRENT', 0, fbo) = ('CURRENT', 0, 1)
    172 self.glir.flush(self.shared.parser)

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\gloo\glir.py:822, in GlirParser.parse(self=<vispy.gloo.glir.GlirParser object>, commands=[('CURRENT', 0, 1)])
    819     self._objects.pop(id_)
    821 for command in commands:
--> 822     self._parse(command)
        command = ('CURRENT', 0, 1)
        self = <vispy.gloo.glir.GlirParser object at 0x000001E8D975B580>

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\gloo\glir.py:750, in GlirParser._parse(self=<vispy.gloo.glir.GlirParser object>, command=('CURRENT', 0, 1))
    748     self._gl_initialize()
    749     self.env['fbo'] = args[0]
--> 750     gl.glBindFramebuffer(gl.GL_FRAMEBUFFER, args[0])
        args = (1,)
        args[0] = 1
        gl.GL_FRAMEBUFFER = GL_FRAMEBUFFER
        gl = <module 'vispy.gloo.gl' from 'C:\\Users\\Youyi\\AppData\\Local\\napari-0.4.17rc4\\envs\\napari-0.4.17rc4\\lib\\site-packages\\vispy\\gloo\\gl\\__init__.py'>
    751 elif cmd == 'FUNC':
    752     # GL function call
    753     args = [as_enum(a) for a in args]

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\gloo\gl\_gl2.py:55, in glBindFramebuffer(target=GL_FRAMEBUFFER, framebuffer=1)
     53     nativefunc = glBindFramebuffer._native
     54 except AttributeError:
---> 55     nativefunc = glBindFramebuffer._native = _get_gl_func("glBindFramebuffer", None, (ctypes.c_uint, ctypes.c_uint,))
        (ctypes.c_uint, ctypes.c_uint,) = (<class 'ctypes.c_ulong'>, <class 'ctypes.c_ulong'>)
        ctypes.c_uint = <class 'ctypes.c_ulong'>
     56 nativefunc(target, framebuffer)

File ~\AppData\Local\napari-0.4.17rc4\envs\napari-0.4.17rc4\lib\site-packages\vispy\gloo\gl\gl2.py:85, in _get_gl_func(name='glBindFramebuffer', restype=None, argtypes=(<class 'ctypes.c_ulong'>, <class 'ctypes.c_ulong'>))
     81     raise RuntimeError('Function %s not available '
     82                        '(OpenGL version is %s).'
     83                        % (name, _get_gl_version(_lib)))
     84 if not _have_context():
---> 85     raise RuntimeError('Using %s with no OpenGL context.' % name)
        name = 'glBindFramebuffer'
        'Using %s with no OpenGL context.' % name = 'Using glBindFramebuffer with no OpenGL context.'
     86 address = wglGetProcAddress(name.encode('utf-8'))
     87 if address:

RuntimeError: Using glBindFramebuffer with no OpenGL context.

To Reproduce