[Webkit-unassigned] [Bug 233817] New: ETC1S compressed textures don't have alpha channel information

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=233817

            Bug ID: 233817
           Summary: ETC1S compressed textures don't have alpha channel
                    information
           Product: WebKit
           Version: Safari 15
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: felix.herbst at gmail.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

Created attachment 445862

  --> https://bugs.webkit.org/attachment.cgi?id=445862&action=review

Test file that exhibits the broken behaviour

It seems that when compressing textures with e.g. toktx to etc1s and loading those, the resulting GPU texture doesn't have alpha information on Safari 15 (works in 14, works in other browsers).

https://glitch.com/edit/#!/sponge-lemon-vulture

See https://github.com/google/model-viewer/issues/3024 for screenshots of the issue.

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