[Webkit-unassigned] [Bug 239688] New: 'WebGL via Metal' breaks ColorizePhoto.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239688

            Bug ID: 239688
           Summary: 'WebGL via Metal' breaks ColorizePhoto.com
           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: nkronlage at hotmail.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

A recent regression in iOS 15.4 causes https://www.colorizephoto.com/ to stop working, affecting many site users. Disabling WebGL via Metal restores functionality to the site.

Repro:
Ensure 'WebGL via Metal' enabled: Settings App -> Safari -> Advanced -> Experimental Features -> Turn on 'WebGL via Metal'
In Safari, go to https://www.colorizephoto.com/converter
Try painting on Clint Eastwood's face

Expected:
The black/white photo should have skin color where you paint

Actual:
Nothing happens - no coloring of the black/white photo

Try again after turning off 'WebGL via Metal' to see the correct behavior

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