1169053 - unable to create GL context

Status: RESOLVED INACTIVE

(Core :: Graphics: CanvasWebGL, defect)

Description

[(not reading bugmail) Nick Desaulniers [:\n]]

Attachment: about support

Executing the following statement in the web console:

document.createElement('canvas').getContext('webgl')

there's a long pause, then null is returned.  FF 38.0.1 OSX 10.10.3.

Comment 1

[(not reading bugmail) Nick Desaulniers [:\n]]

After a reboot of the process, this is no longer the case.  Hopefully, the about:support log has something useful.

Comment 2

[Kelsey Gilbert [:jgilbert]]

Comment on attachment 8611491 [details]
about support

Nothing too weird. Now that's it's working, try pulling the about:support again now that it works, and we'll check if the *-marked things below stop being empty. I think this is still just the symptom and doesn't help with the cause, though.

  "graphics": {
    "numTotalWindows": 2,
    "numAcceleratedWindows": 2,
    "windowLayerManagerType": "OpenGL",
    "windowLayerManagerRemote": true,
*    "adapterDescription": "",
    "adapterVendorID": "0x8086",
    "adapterDeviceID": "0x 166",
*    "adapterRAM": "",
*    "adapterDrivers": "",
*    "driverVersion": "",
*    "driverDate": "",
*    "webglRendererMessage": [
      ""
    ],
    "info": {
      "AzureCanvasBackend": "quartz",
      "AzureSkiaAccelerated": 0,
      "AzureFallbackCanvasBackend": "none",
      "AzureContentBackend": "quartz"
    }
  },

Comment 3

[(not reading bugmail) Nick Desaulniers [:\n]]

Attachment: about support after reload

Indeed, there is a diff:

➜  tmp  diff about_support.text about_support2.text
9c9
<     "numTotalWindows": 2,
---
>     "numTotalWindows": 1,
109,110c109,110
<     "numTotalWindows": 2,
<     "numAcceleratedWindows": 2,
---
>     "numTotalWindows": 1,
>     "numAcceleratedWindows": 1,
120,122c120
<     "webglRendererMessage": [
<       ""
<     ],
---
>     "webglRenderer": "NVIDIA Corporation -- NVIDIA GeForce GT 650M OpenGL Engine",

Comment 4

[Kelsey Gilbert [:jgilbert]]

Alright, yeah, nothing interesting there. It's succeeding at making contexts again, but that doesn't really help us with why. (Though it is weird that the VendorID is for Intel, whereas the WebGL renderer is NVidia. That's the ideal scenario, as long as we're doing it intentionally.