[Webkit-unassigned] [Bug 218282] New: rendering to an offscreen framebuffer alterates canvas display

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218282

            Bug ID: 218282
           Summary: rendering to an offscreen framebuffer alterates canvas
                    display
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zebontheweb at gmail.com
                CC: dino at apple.com

Created attachment 412522

  --> https://bugs.webkit.org/attachment.cgi?id=412522&action=review

sample reproducing the pb

See attached sample.

1/ create a canvas
2/ create an webgl context 
3/ clear with black color

4/ create an offscreen framebuffer to render to a texture
5/ clear with black color in a setTimeout callback

Result : the canvas switch to transparent

Expected result : the canvas should remain black

Maybe similar to https://bugs.webkit.org/show_bug.cgi?id=218177 or related bugs

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