[Webkit-unassigned] [Bug 182379] New: glClearColor - Safari Mobile WebGL implementation doesn't render a transparent background

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=182379

            Bug ID: 182379
           Summary: glClearColor - Safari Mobile WebGL implementation
                    doesn't render a transparent background
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: Other
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: robertogarridomartin at gmail.com
                CC: dino at apple.com

Created attachment 332860

  --> https://bugs.webkit.org/attachment.cgi?id=332860&action=review

Minimal example reproducing the issue

On safari mobile on iOS 1.3 beta, when loading a website with a WebGL canvas and a text behind it, if you just call glClearColor with a transparent color, the text is not shown. It didn't happen in the previous version of Safari mobile.

The issue can be reproduced if you open Safari on iOS 1.3 beta and load any website with a WebGL canvas and a text behind it. For the canvas, just set the clear color to something semi transparent.

What I expect is to see the text behind the canvas. 

What I actually see is a black canvas.

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