[Webkit-unassigned] [Bug 112481] New: Crash using WEBGL_draw_buffers extension on MacBook Pro Retina Display

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=112481

           Summary: Crash using WEBGL_draw_buffers extension on MacBook
                    Pro Retina Display
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.8
            Status: NEW
          Severity: Normal
          Priority: P1
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kbr at google.com
                CC: dino at apple.com, cmarrin at apple.com, zmo at google.com,
                    gman at chromium.org, bajones at chromium.org


Created an attachment (id=193399)
 --> (https://bugs.webkit.org/attachment.cgi?id=193399&action=review)
Crash report

http://aleksandarrodic.com/p/three/examples/webgl_multiple_render_targets_crash2.html causes a crash inside glClear when run in a WebKit Nightly on a Retina Display MacBook Pro. The crash report is attached. Apparently the interesting thing about this test case is that it uses textures which are less than 128 pixels on a side with the WEBGL_draw_buffers extension. (However, the conformance test for this extension does something similar.)

Interestingly, the same example runs fine in Chrome Canary, so it seems there must be some OpenGL context state triggering the crash, and that it is avoidable.

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