[Webkit-unassigned] [Bug 234006] New: WebGL Context antialias performance regression

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234006

            Bug ID: 234006
           Summary: WebGL Context antialias performance regression
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: iOS 15
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jekfer.bichon at 3ds.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

Created attachment 446362

  --> https://bugs.webkit.org/attachment.cgi?id=446362&action=review

Sample to reproduce

Hello,

We have detected a performance regression on Safari 15 when using "antialias: true" option on the WebGLRendering context. The regression was detected on an iPad Gen 8.

I have attached a sample to reproduce the issue, on portrait mode. On Safari 14 we were getting an average of 58-59 fps on the sample, meanwhile Safari 15 runs around 36 fps. Disabling the experimental option "WebGL via Metal" on Safari 15 puts the performances back at Safari 14 level.
The portrait/landscape mode is not very important to the issue at hand, the quad on the sample was simply positioned in a way to occupy most of the screen on portrait mode.

Thank you.

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