1125833 - Regression in v35 when working with WebGL FBOs under angle on windows

Status: RESOLVED DUPLICATE of bug 1125445

(Core :: Graphics: CanvasWebGL, defect)

Description

[samuel.perrouault]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0
Build ID: 20150108202552

Steps to reproduce:

Be under Firefox 35 on windows with WebGL going through angle.
Render to an fbo, then read back from it to perform calculations.


Actual results:

The values read back are incorrect.



Expected results:

The values should be similar to when they were written.
http://jsfiddle.net/f17Lz5ux/1316/
In the example above, the canvas on the left is the depth map rendered to screen.
The canvas on the right is the depth map encoded as RGBA in an fbo and then read back to screen.
Both images should be similar or at least coherent.
They were in firefox 34, they are not anymore in firefox 35.
This is in windows under angle only. Any other configuration works.

Comment 1

[Alice0775 White]

[Tracking Requested - why for this release]:

Comment 2

[Lawrence Mandel [:lmandel] (use needinfo)]

Milan - Can you team investigate?

Comment 3

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

Yup, working on it.

Comment 4

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

Bug 1125445 has a patch on it, so duping to that instead.

Comment 5

[Lawrence Mandel [:lmandel] (use needinfo)]

I have set the tracking and status flags on bug 1125445. As such, I have cleared the flags on this bug.