[Webkit-unassigned] [Bug 220833] New: texImage2d stops updating texture from playing video element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220833

            Bug ID: 220833
           Summary: texImage2d stops updating texture from playing video
                    element
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkitbugzilla at aminmesbah.com
                CC: dino at apple.com, kbr at google.com

Created attachment 418093

  --> https://bugs.webkit.org/attachment.cgi?id=418093&action=review

Minimal bug example with instructions

When a WebGL texture is being updated with frames from a playing video element
through calls to `gl.texImage2d()`, a sequence of operations will cause these
texture updates to begin silently failing.

The sequence of operations is:

- pause video
- defocus Safari
- focus Safari
- play video
- pause video
- play video

I have reproduced the issue with a minimal html/js file and public domain video,
which I've attached in a zip archive.

#### Instructions

1. Open html file in Safari and let video start playing.
2. Click 'pause' button.
3. Switch focus to another window or go to a different MacOS workspace.
4. Return focus to the Safari window.
5. Click 'play' button.
6. Click 'pause' button.
7. Click 'play' button.

- Expectation: The video texture continues to be updated as the video plays once
  again from the beginning.
- Reality: The video plays, with the video's audio audible, but the texture
  doesn't get updated even though `gl.texImage2d()` is being called.

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