[Webkit-unassigned] [Bug 47697] New: [chromium] context-attributes-etc conformance test fails in DRT

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=47697

           Summary: [chromium] context-attributes-etc conformance test
                    fails in DRT
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: enne at google.com
                CC: kbr at google.com, zmo at google.com


I updated context-attributes-alpha-depth-stencil-antialias.html in the Khronos repository and was hoping to push that updated test into WebKit.

This test runs correctly in Chromium on Linux, but fails the antialias=true test when running in DRT on the same machine.  I tried several variations on the existing test, but could not get Mesa to produce anything other than a pixel that was fully obscured or unobscured.  Mesa reports that it is using multisampling, which is why the test fails.

One possibility to fix this might be to have Mesa not use multisampling at all for WebGL.  We already do this for the canvas case.

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