[Bug 99144] Incorrect rendering using glDrawArraysInstancedBaseInstance and first != 0 on Skylake

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99144

            Bug ID: 99144
           Summary: Incorrect rendering using
                    glDrawArraysInstancedBaseInstance and first != 0 on
                    Skylake
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: pelloux at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 128549
  --> https://bugs.freedesktop.org/attachment.cgi?id=128549&action=edit
simple test case

The attached program produces different incorrect result on Intel Skylake
(using Mesa 13.0.2 or master).

Modifying the vertex shader to use: "3 + gl_VertexID" is enough to get the
expected behavior.

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