[Webkit-unassigned] [Bug 181007] New: WebGL canvas with enabled blending and no antialiasing is incorrectly composed with background

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=181007

            Bug ID: 181007
           Summary: WebGL canvas with enabled blending and no antialiasing
                    is incorrectly composed with background
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kdmitrenko at gmail.com
                CC: dino at apple.com

Created attachment 329849

  --> https://bugs.webkit.org/attachment.cgi?id=329849&action=review

Expected result

If threre's a html element with a background underneath the canvas, and blending is enabled in the context, composition for some reason goes "additive". Here's a test page: https://codepen.io/dmikis/full/ZvQPBG/.

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