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Issue 839664 link

Starred by 1 user
Status: WontFix
Owner: ----
Closed: May 2018
Cc:
█ krajshree@chromium.org
█ kbr@chromium.org
█ junov@chromium.org
kainino@chromium.org
jdarpinian@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Mac
Pri: 2
Type: Bug-Regression



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WebGL canvas passed to drawImage is very slow

Project Member Reported by vmi...@chromium.org, May 4 2018 
Chrome Version: 68.0.3418.0 (Canary)
OS: MacOS 10.13.3

Steps to reproduce:

1. Visit: http://www.scirra.com/labs/bugs/webgl-canvas2d-perf.html
2. Observe the FPS reading


Actual results:

The demo simply creates a window-sized WebGL canvas which changes every frame, and copies it to a window-sized 2D canvas with drawImage(). On a mid-2015 Macbook Pro Retina, this runs at about ~26 FPS.


Expected results:

It should run at 60 FPS.  This used to run at 60 FPS on Chrome according to the developer.

Comment 1 by kbr@chromium.org, May 4 2018

Labels: Needs-Bisect
Argh. Do we have a regression range for this, or at least a revision of an old Chromium build where this used to be fast?

Comment 2 by vmi...@chromium.org, May 4 2018 

Fortunately it looks like a recent regression.

66.0.3359.139 stable is OK
67.0.3396.30 beta is OK

Comment 3 by krajshree@chromium.org, May 4 2018

Cc: krajshree@chromium.org
Labels: Needs-Triage-M68 Needs-Feedback Triaged-ET
Unable to reproduce the issue on 10.13.3 mid-2015 Macbook Pro Retina using chrome reported version #68.0.3418.0.

Attached a screen cast for reference.

Following are the steps followed to reproduce the issue.
------------
1. Visited: http://www.scirra.com/labs/bugs/webgl-canvas2d-perf.html
2. Observed that the FPS reading ran at 60 FPS as expected.

vmiura@ - Could you please check the attached screen cast and please let us know if anything missed from our end.

Thanks...!!
Screen Shot 2018-05-04 at 12.02.55.png
302 KB View Download
839664.mp4
1.1 MB View Download

Comment 4 by vmi...@chromium.org, May 4 2018

Status: WontFix (was: Available)
Thank you for testing krajshree@.

After resetting all settings to defaults in about:flags it is also working at 60fps for me.  I must have had something affecting canvas mode enabled.  Sorry for the false alarm.
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