[Webkit-unassigned] [Bug 49089] New: WebGL renderbuffers can still be uninitialized: need to set the viewport explicitly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=49089

           Summary: WebGL renderbuffers can still be uninitialized: need
                    to set the viewport explicitly
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bjacob at mozilla.com


This is a variant of bug 48351.

I believe that WebGLFramebuffer::initializeRenderbuffers() needs to set the viewport to (0,0,w,h) where w and h are the width and height of the framebuffer. Otherwise, if the user had set a tiny viewport, the glClear call here fails to initialize the renderbuffer, allowing video memory readback as in bug 48351.

We just fixed this in Mozilla:
http://hg.mozilla.org/mozilla-central/file/3769e11d18d6/content/canvas/src/WebGLContext.h#l1533

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