1330333 - draw_instanced_ubo demo not displayed on macOS Sierra with AMD graphics

Status: NEW

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

Description

[Bogdan Maris, Desktop QA]

[Affected versions]:
- Firefox 51 beta 13
- latest Developer Edition 52.0a2
- latest Nightly 53.0a1

[Affected platforms]:
- macOS Sierra 10.12.2

[Steps to reproduce]:
1. Start Firefox
2. Visit http://webglsamples.org/WebGL2Samples/#draw_instanced_ubo

[Expected result]:
- Demo is displayed successfully

[Actual result]:
- Demo is not displayed.

[Regression range]:
- This issue is not a recent regression, it also reproduces on an old Nightly build (2016-07-12), where webgl2 was enabled by default.

[Additional notes]:
- Unable to display the demo in Chrome Canary as well.
- Console output:
> Error: WebGL: Disallowing antialiased backbuffers due to blacklisting. draw_instanced_ubo.html:70:18
- Graphics:
Features
Compositing	OpenGL
Asynchronous Pan/Zoom	wheel input enabled; scrollbar drag enabled
WebGL Renderer	ATI Technologies Inc. -- AMD Radeon HD 6750M OpenGL Engine
WebGL2 Renderer	ATI Technologies Inc. -- AMD Radeon HD 6750M OpenGL Engine
Hardware H264 Decoding	No
Audio Backend	audiounit
GPU #1
Active	Yes
Vendor ID	0x1002
Device ID	0x6741
Diagnostics
AzureCanvasAccelerated	1
AzureCanvasBackend	skia
AzureContentBackend	skia
AzureFallbackCanvasBackend	none
TileHeight	512
TileWidth	512

- I did try on two other macs (iMac 21.5-inch, Late 2013 and MacBook Pro Retina 13-inch, Early 2015), both with Intel graphic cards (Intel Iris Pro 1536 MB and Intel Iris Graphics 6100 1536 MB) and the demo was shown just fine.

Comment 1

[Milan Sreckovic [:milan] (needinfo for best results)]

Yes, we blocklist MSAA on ATI+Mac since bug 695912 (2011).

Comment 2

[Julien Cristau [:jcristau] (back April 22)]

Mass wontfix for bugs affecting firefox 52.