1125155 - Bad rendering of WebGL with ANGLE enabled

Status: NEW

(Core :: Graphics: CanvasWebGL, defect, P3)

Description

[jonas echterhoff]

Attachment: angle_issue.zip

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/600.3.18 (KHTML, like Gecko) Version/8.0.3 Safari/600.3.18

Steps to reproduce:

-unzip attached angle_issue.zip
-Open index.html


Actual results:

You should see a yellow cube on a blue background, which turns blurry after a second.


Expected results:

When WebGL is using the ANGLE backend, the image will become very dark instead.

Comment 1

[Loic]

Attachment: ff35-win7.jpg

I see that with FF35 on Win 7 (animation becomes dark). Is it the normal rendering?

If yes, is your bug specific to OSX (eventually Linux)?

Comment 2

[Matthias Versen [:Matti]]

Firefox35 on windows renders the WebGL Area black after a second (expected result).
The same Firefox version on OSx10.9 doesn't turn dark but my system is using the Nvidia Opencl renderer

Comment 3

[jonas echterhoff]

Oops, I just realized that my bug submission was badly written, as I have the actual and expected results flipped. Sorry for that.

So, the page is showing a shader anti-aliasing effect, which should result in a blurry rendering of the cube. This renders correctly on the OpenGL WebGL backend (OS X, Linux, Windows with ANGLE disabled in about:config). On the ANGLE backend (windows default), however, it will show a dark screen instead. This is the bug.

Comment 4

[Loic]

regression range:
good=2014-07-06
bad=2014-07-07
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=81691a55e60f&tochange=1dc6b294800d

Probably:
Vladimir Vukicevic — b=1010371, code fixes for new ANGLE version; r=jrmuizel
Vladimir Vukicevic — b=1010371; Update ANGLE; r=upstream

Comment 5

[Kelsey Gilbert [:jgilbert]]

I can still repro the difference. (Win10 with NV, my MBP) Not sure what the bug is without more digging. Relatively low priority for now.

Comment 6

[Kelsey Gilbert [:jgilbert]]

Also, no crash happens in either case when using MOZ_GL_DEBUG_ABORT_ON_ERROR=1.