[Webkit-unassigned] [Bug 232357] New: Huge textures are not rendered correctly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232357

            Bug ID: 232357
           Summary: Huge textures are not rendered correctly
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: taoyagi at mozilla.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

From: https://github.com/mozilla/hubs/issues/4771

A glb (glTF binary version) is rendered black on my iPhoneX iOS 15.1 Safari/Chrome.
I found that the glb file contains three 4096x4096 textures (and other smaller textures).
I speculate those huge textured are not rendered correctly.

I made a simple test which loads and renders the glb file with Three.js,
and which can reproduce the problem.

https://takahirox.github.io/ios-render-test/room.html

The problem seems to be reproducible other iOS devices.
And a person who uses iOS 14.7.1 couldn't reproduce the problem.
So I speculate the issue may be an iOS regression issue.

My environment.
Device: iPhoneX
OS: iOS 15.1
Browser: Safari, Chrome

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