[Webkit-unassigned] [Bug 139024] New: WebGL Shader corruption with iPhone 5 on iOS 8.1.1

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139024

            Bug ID: 139024
           Summary: WebGL Shader corruption with iPhone 5 on iOS 8.1.1
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: iOS
                OS: iOS 8.1
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: markperris at me.com

Created attachment 242155
  --> https://bugs.webkit.org/attachment.cgi?id=242155&action=review
Screenshot of corruption visible on an iPhone 5.

Running the following example on an iPhone 5 with iOS 8.1.1 causes corrupted output, per the screenshot attached.

http://sqr.bartekdrozdz.com/html/lab/gl_ssao/

The same style of corruption is also visible on certain examples on ShaderToy.
The ShaderToy examples work correctly with an iPhone 6, suggesting it could be a driver bug.
I'll test this specific example on an iPhone 6 when I head past the Apple Store tonight.

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