[Bug 94524] Wrong gl_TessLevelOuter interpretation for isolines

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Mar 13 18:03:03 UTC 2016


            Bug ID: 94524
           Summary: Wrong gl_TessLevelOuter interpretation for isolines
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: lankyleggy at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 122269
  --> https://bugs.freedesktop.org/attachment.cgi?id=122269&action=edit
Piglit patch to add failing test

On Intel Haswell (at least: I don't have other hardware to test), on Mesa git
aa3b85f, when using the isolines tessellation primitive mode, the outer
tessellation levels are interpreted the wrong way around.

The GL_ARB_tessellation_shader specification says, under the header "Isoline
    The number of isolines generated is derived from the first outer
    tessellation level; the number of segments in each isoline is derived from
    the second outer tessellation level.

However, the number of isolines is currently taken from gl_TessLevelOuter[1],
and the number of segments in each from gl_TessLevelOuter[0].

I've attached a Piglit patch that adds a test for this.

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