[Webkit-unassigned] [Bug 215908] New: REGRESSION: Textures Fail to Render in WebGL from HLS Stream [iOS 14]

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215908

            Bug ID: 215908
           Summary: REGRESSION: Textures Fail to Render in WebGL from HLS
                    Stream [iOS 14]
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rigel at 8thwall.com
                CC: dino at apple.com

Created attachment 407441

  --> https://bugs.webkit.org/attachment.cgi?id=407441&action=review

Image comparing iOS 14 Beta 6 to iOS 13.6.1

Overview: As recently as iOS 14 Developer Beta 6, Safari no longer renders textures from HLS streams in WebGL. This is critical for streaming video within popular WebGL frameworks such as three.js, A-Frame, babylon.js etc. 

*Examples to Reproduce Issue*

three.js example: Visit https://8w.8thwall.app/hls-threejs on an iOS/iPadOS device running iOS 14 Developer Beta 6 or later. The rotating cube has a video texture applied from an HLS stream. The video in the top left corner is using the same HLS stream but rendering on top of the page outside WebGL.

babylon.js example: Visit https://www.babylonjs-playground.com/#9FSDC7#49 on iOS/iPadOS device running iOS 14 Developer Beta 6 or later. The plane has a video texture applied from an HLS stream.

Both examples work correctly on: 
iOS 13.6.1 Safari (iPhone 11 Pro Max)
iPadOS 13.6.1 Safari (iPad Pro 11", 2018)
Safari Technology Preview Release 112 [Safari 14.0, WebKit 15610.1.25.5.1] (MacBook Pro 15-inch, 2017; 10.15.6) 

However, both examples fail to produce a texture on iOS 14 Developer Beta 6 Safari (iPhone XR).

Here is an unlisted video comparing iOS 14 Beta 6 to iOS 13.6.1: https://youtu.be/jzjoHtADnmU

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