[Bug 96421] gl_VertexID sequence is not correct in non-index drawing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96421

            Bug ID: 96421
           Summary: gl_VertexID sequence is not correct in non-index
                    drawing
           Product: Mesa
           Version: 11.2
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: dongseong.hwang at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 124384
  --> https://bugs.freedesktop.org/attachment.cgi?id=124384&action=edit
gl_VertexID sequence is not correct in non-index drawing

OpenGL ES 3.0 Mesa 11.2.0 in HSW generates incorrect gl_VertexID sequence.

e.g. when I draw as follows
glDrawArrays(GL_POINTS, 0, 1000);

max gl_VertexID is not 999, but about 1200, while total vertext number is 1000.
It means gl_VertexID skips some number.

In the attachment, red points are inside max gl_VertexID, while green points
are outside max gl_VertexID. You can see lots of skipped gl_VertexID also.

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