[Webkit-unassigned] [Bug 238788] New: ANGLE incorrectly calculates if any frame buffer draw buffers are masked

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238788

            Bug ID: 238788
           Summary: ANGLE incorrectly calculates if any frame buffer draw
                    buffers are masked
           Product: WebKit
           Version: Other
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: ANGLE
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: djg at apple.com
                CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com

It appears that the code in `Framebuffer::partialClearNeedsInit` falsely returns that a partial clear is needed on 64-bit targets because the unused high-nibble of mMaxColorMask is being considered.

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