Created attachment 431562 [details] Video of the repro app running on an iPhone12 Pro Max with iOS 15 On iOS 15 using a video as a texture is very slow and hangs. This is a regression from iOS 14.6. Repro app: https://8w.8thwall.app/performance-test-video-texture Repro code: https://codesandbox.io/s/video-texture-performance-test-hmybu This sample code uses a Three.js THREE.VideoTexture as the texture for a material on a cube. Result: - iPhone 12 Pro Max iOS 15.0: The render loop takes ~60 ms and has constant hangs with both WebGL 1 and WebGL 2, and with "WebGL via Metal" = true / false. - iPhone 12 Pro iOS 14.6: The render loops takes 4.2 ms with no hangs with both WebGL 1 and WebGL 2. As noted above I have tested with WebGL 1 / 2 and "WebGL via Metal" = true / false (on iOS 15), and no combination fixes the issue on iOS 15 or causes it to repro on iOS 14.6. Attached is a video of the repro app. Please let me know if I can provide more info, thank you.
Created attachment 431563 [details] Video of the repro app running on an Phone 12 Pro with iOS 14.6
Kimmo, would you be able to triage this since it's happening on hardware? May be related to Bug 226830, though that one seems specific to video elements created from getUserMedia.
Note that this is a key code path that was carefully ensured to retain performance in the ANGLE/GLES code path. Not sure whether the GPU process has been deployed in Safari on iOS 15, or whether this might be a regression in ANGLE/Metal.
Actually, this may be a duplicate of Bug 223740.
Created attachment 432031 [details] Patch
<rdar://problem/79673064>
Comment on attachment 432031 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=432031&action=review This looks great to me, thanks! > Source/WebKit/Scripts/webkit/tests/TestWithCVPixelBufferMessageReceiver.cpp:2 > + * Copyright (C) 2010-2021 Apple Inc. All rights reserved. Probably only need `2021` for a new file. > Source/WebKit/Scripts/webkit/tests/TestWithCVPixelBufferMessages.h:2 > + * Copyright (C) 2010-2021 Apple Inc. All rights reserved. Ditto > Source/WebKit/Scripts/webkit/tests/TestWithCVPixelBufferMessagesReplies.h:2 > + * Copyright (C) 2010-2021 Apple Inc. All rights reserved. Ditto
Amazing diagnosis and fix Kimmo!
Created attachment 432153 [details] Patch for landing
Committed r279221 (239107@main): <https://commits.webkit.org/239107@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 432153 [details].
Thanks for the report and the test case!