[Bug 96617] gl_SecondaryFragDataEXT doesn't work for extended blend func

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96617

            Bug ID: 96617
           Summary: gl_SecondaryFragDataEXT doesn't work for extended
                    blend func
           Product: Mesa
           Version: 11.2
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: corentin at wallez.net
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Using GL_EXT_blend_func_extended works with gl_FragColor /
gl_SecondaryFragColorEXT but not with gl_FragData[0] /
gl_SecondaryFragDataEXT[0]

This was found when trying to use the 3.3 core profile in Chromium.

See
https://github.com/Kangz/GLDriverBugs/blob/master/gl_secondary_frag_data/Main.cpp#L24
for a repro case (no blue triangle shows up).

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