[Mesa-dev] [Bug 28577] Incorrect specular highlights on backfaces

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28577

--- Comment #2 from Tim Evans <t.evans at aranz.com> 2010-06-17 19:42:28 PDT ---
Created an attachment (id=36354)
 View: https://bugs.freedesktop.org/attachment.cgi?id=36354
 Review: https://bugs.freedesktop.org/review?bug=28577&attachment=36354

Patch against mesa-7.8.2 that fixes this problem

In ss_tritmp.h, the backface specular values are copied into the vertex attrib
array using SS_SPEC. SS_SPEC converts the values from float [0,1] to uint8
[0,255], but the vertex attrib array is float, and the values are used as if
they were [0,1] later.  Changing the definition of SS_SPEC to COPY_4V fixes the
problem for me.  Attaching a patch to that effect.

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