[Mesa-dev] [Bug 54142] Mesa: User error: GL_INVALID_OPERATION

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54142

--- Comment #3 from Laurent carlier <lordheavym at gmail.com> 2012-08-28 07:20:53 UTC ---
"A varying variable must be written on a vertex shader, where we compute the
value of the variable for each vertex. In the fragment shader the variable,
whose value results from an interpolation of the vertex values computed
previously, can only be read."

lightDir is a varying that was write in the vertex shader, so it can only be
read in the fragment shader

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