[Webkit-unassigned] [Bug 184033] New: Nothing renders if attribute 0 is disabled and VAO extension is enabled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=184033

            Bug ID: 184033
           Summary: Nothing renders if attribute 0 is disabled and VAO
                    extension is enabled
           Product: WebKit
           Version: Safari 11
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kdmitrenko at gmail.com
                CC: dino at apple.com

Created attachment 336573

  --> https://bugs.webkit.org/attachment.cgi?id=336573&action=review

Test case.

Rendering work fine with attribute 0 disabled and without OES_vertex_array_object extension enabled. But if the extension is enabled and a non-null VAO object with 0 attrib disabled is bound, nothing renders.

Test page: https://codepen.io/dmikis/full/VXrBBe. A picture expected, black canvas is rendered instead.

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