1441806 - Default WebGL context comes with depth buffer precision 16 bit (Windows only)

Status: RESOLVED DUPLICATE of bug 1427668

(Core :: Graphics: CanvasWebGL, defect)

Description

[batogovsky]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36

Steps to reproduce:

I open www.webglreport.com and check depth buffer precision in five different PCs with Windows using Firefox 58.0.2 and on 3 MacBooks.


Actual results:

On Windows, I get 16-bit depth buffer precision and on Mac OS get 24-bit depth buffer precision.


Expected results:

It should always be 24 bit. It was before, and it is in all other browsers, and even on Firefox on Mac it is today 24. Only on Windows Firefox use 16-bit depth buffer precision.

Comment 1

[Gingerbread Man]

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0
20180228100110

Reproducible in Firefox 58.0.2 but not the latest Nightly. mozregression-gui shows this was fixed in Firefox 59.
https://hg.mozilla.org/integration/mozilla-inbound/json-pushes?changeset=2ba0c8df9a6786d5a70065b03ac66ffbe05695cb&full=1


(In reply to batogovsky from comment #0)
> I open www.webglreport.com and check depth buffer precision in five
> different PCs with Windows using Firefox 58.0.2 and on 3 MacBooks.

For future reference, it's best to test the latest Nightly [1] in a brand new profile [2]. The former insures the bug isn't fixed yet. The latter insures user preferences and add-ons aren't to blame; it also keeps your regular profile safe, as going forward then back in versions would otherwise corrupt it.

> It should always be 24 bit. It was before

mozregression-gui [3] can determine the regression range when the bug was introduced (or fixed). Including this information in a bug report helps move it along a lot quicker.


[1] https://nightly.mozilla.org
[2] https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
[3] https://mozilla.github.io/mozregression/quickstart.html