[Webkit-unassigned] [Bug 234345] New: Shader error on ios 15 devices causes squares to appear on the screen

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234345

            Bug ID: 234345
           Summary: Shader error on ios 15 devices causes squares to
                    appear on the screen
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: iOS 15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: daniil at flying-sheep.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

Created attachment 447230

  --> https://bugs.webkit.org/attachment.cgi?id=447230&action=review

Ninjango bug example

Shader errors on devices with ios 15 version.

Problem occurred on both 15.0 and 15.2 versions of iOS.

Compilation error in the console:
THREE.WebGLProgram: shader error:  1282 35715 false gl.getProgramInfoLog Internal error compiling shader with Metal backend.

Games bug occurred in:
https://www.toggo.de/spiele/spiel/turnier-der-tapferen
-To recreate the bug:
Go through the link with ios 15 version
After game is loaded click on the start game button
Go through the all the screens until you will reach the 3d game scene
Wait until countdown is finished 
Black squares will appear and the compilation error will show up


https://www.toggo.de/spiele/spiel/fusballturnier
-To recreate the bug:
Go through the link with ios 15 version
After game is loaded click on the start game button to start a game
Green squares will appear and the compilation error will show up

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