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GLSL shaders can access the normal scale factor with the built-in gl_NormalScale. Mesa's modelspace lighting optimization uses a different normal scale factor than defined in the spec. We have to take care not to use this factor for gl_NormalScale. Mesa already defines two seperate states: state.normalScale and state.internal.normalScale. The first is used by the glsl compiler while the later is used by the fixed function T&L pipeline. Previously the only difference was some component swizzling. With this commit state.normalScale always uses the normal scale factor for eyespace lighting. Reviewed-by: Brian Paul <brianp@vmware.com>
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