[Webkit-unassigned] [Bug 223740] New: Inconsistent WebGL video upload performance

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223740

            Bug ID: 223740
           Summary: Inconsistent WebGL video upload performance
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kkinnunen at apple.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com
            Blocks: 223434

Created attachment 424226

  --> https://bugs.webkit.org/attachment.cgi?id=424226&action=review

testcase

Reported as per Marcin:
1) Results on my iPhone SE ~ 2017 14.4.1 and iPad Air 2020 14.4.1

   1.1 paused movie 
       - performance 60fps
       - no visual presentation drops

   1.2 playing movie with texture updates at 10FPS
       - performance 60fps
       - HEAVY presentation drops!!!!!!! why?

   1.3 playing movie with texture updates at 60FPS
       - performance 60fps
       - no visual presentation drops (interesting right?)

2) Results on my iMac ~ 2017 Catalina 10.15.7, Safari 14.2 TP 122

   1.1 paused movie 
       - performance 60fps
       - no visual presentation drops

   1.1 playing movie (texture update rate makes no difference here)
       - performance 60fps
       - random visual presentation drops, 
         (intensifies with more pressure on CPU/GPU)

Zip file contains alternate video files (puppets), results with it are much better on iMac but causes same heavy drops on iPhone.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=223434
[Bug 223434] WebGL2 performance problem test cases
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