[Webkit-unassigned] [Bug 85528] New: Conformance test conformance/buffers/index-validation.html failing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=85528

           Summary: Conformance test
                    conformance/buffers/index-validation.html failing
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kbr at google.com
                CC: oliver at apple.com, dino at apple.com, kbr at google.com,
                    zmo at google.com, twiz at chromium.org


After discussion on the public_webgl mailing list, the WebGL spec and conformance test conformance/buffers/index-validation.html was just updated to require that an INVALID_VALUE error be generated when a large negative offset is passed to vertexAttribPointer. The test is now failing on all WebKit ports because the IDL does not correctly describe the argument as a signed 64-bit quantity, so it is being truncated to 32 bits and considered as a signed, in-range value.

I haven't yet found an example in the IDL which passes a 64-bit integer from JavaScript to C++ (understanding fully that JavaScript's numbers can only describe integer values between -(2^53 - 1) and (2^53 - 1)). The code generators will probably need to be enhanced to support this.

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