1135949 - gl.readPixels not returning correct RGBA data in FF35

Status: RESOLVED FIXED

(Core :: Graphics: CanvasWebGL, defect)

Description

[Yow-Hann Lee]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.115 Safari/537.36

Steps to reproduce:

As an example, here's an example code snippet I found that illustrates the issue. http://codepen.io/anon/pen/XJMQwV

readPixels just reads the image data from the webGL canvas on the left and draws it on the right. In firefox 35 for windows readPixels returns [0, 0, 0, 0] for the RGBA data of all pixels read so nothing is drawn on the right.


Actual results:

readPixels just reads the image data from the webGL canvas on the left and draws it on the right. In firefox 35 for windows readPixels returns [0, 0, 0, 0] for the RGBA data of all pixels read so nothing is drawn on the right. It functions as expected in all other browsers. Firefox 34 and below behaves correctly, this appears to be a regression issue.



Expected results:

Expected Behavior is that readPixels returns the RGBA data of each pixel read.

Comment 1

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

Moving to Core/WebGL component

Comment 2

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

This seems to work OK for me on Windows; could be an OSX only issue.

Comment 3

[Yow-Hann Lee]

Hi Vladimir, this is only reproduces in Firefox 35 on Windows 7 x86. 
When updating on the same machine to Firefox 36, this issue does not reproduce.

Comment 4

[Kelsey Gilbert [:jgilbert]]

This was fixed in 36, which is now Release.