[Webkit-unassigned] [Bug 232662] New: Multi-threaded WASM App Fails on Webgl 2.0 Context in iOS 15.2 beta and STP 134

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232662

            Bug ID: 232662
           Summary: Multi-threaded WASM App Fails on Webgl 2.0 Context in
                    iOS 15.2 beta and STP 134
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: iPhone / iPad
                OS: All
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebAssembly
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hypertree at yahoo.com

AvNav is a WebAssembly-powered offline-first Web Application that helps pilots plan flights and navigate complex airspaces. We are excited to see WebKit implementing COEP headers which enables SharedArrayBuffers/WASM Threads making our maps even faster. Big Thank you!

We do see a small problem with the new implementation:

Our app fails to load (silently - no exceptions) when using PTHERADS on WebGL 2.0 context - in iOS 15.2 beta and Safari Technology Preview 134.
App works fine on WebGl 1.0 context (single and multi-threaded).

Here are greatly simplified versions of our maps that demonstrate the problem (no registration or subscription required):

Single Threaded WASM - works everywhere including all recent iOS/iPadOS versions:
https://avnav.io/assets/demo/st/

Multi-Threaded WASM on WebGl 1.0 context - works in Chrome, Firefox and newly released iPadOS 15.2 beta and STP 134:
https://avnav.io/assets/demo/mt/

Multi-Threaded WASM on WebGl 2.0 context - only works in Chrome, and Firefox - fails silently in iPadOS 15.2 beta and STP 134:
https://avnav.io/assets/demo/mt_webgl2/

It will be nice if you can fix this in iOS/iPadOS 15.2 itself - so we don't have to go back to WebGL 1.0 context anywhere!

Thank you!

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