736232 - remove window.WebGLRenderingContext object if GPU is blacklisted

Status: RESOLVED WONTFIX

(Core :: Graphics: CanvasWebGL, defect)

Description

[Paul Irish]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1070.0 Safari/536.3

Steps to reproduce:

* Open Firefox on a machine with a blacklisted GPU.
* See if `WebGLRenderingContext` is falsy, as we already know (synchronously) that the GPU can't support WebGL content



Actual results:

It is truthy. Now my feature detection breaks and I'm going to try to give my users a webgl experience instead of telling them to upgrade their GPU.


Expected results:

WebGLRenderingContext should have been falsy and I could have routed my user to non-webgl content.

Comment 1

[Kelsey Gilbert [:jgilbert]]

We won't always know if we're going to blocklist a driver until we create a context for it. Since we can't tell 100% of the time, is it worth giving this hint where we can? I don't see how it'd be useful, given that its presence isn't authoritative.

You should fix your feature detection to handle context creation failure, regardless.

Comment 2

[Benoit Jacob [:bjacob] (mostly away)]

I agree with comment 1.

Comment 3

[Kelsey Gilbert [:jgilbert]]

I'm going to mark this WONTFIX, since it's not really ever usefully authoritative. That is, no one should ever rely on the behavior here, and trying to do a partial implementation might just encourage people to assume that this should work.