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gl_rasterizer/lighting: more accurate CP formula
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@ -594,8 +594,8 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
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// Note: even if the normal vector is modified by normal map, which is not the
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// normal of the tangent plane anymore, the half angle vector is still projected
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// using the modified normal vector.
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std::string half_angle_proj = "normalize(half_vector) - normal / dot(normal, "
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"normal) * dot(normal, normalize(half_vector))";
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std::string half_angle_proj =
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"normalize(half_vector) - normal * dot(normal, normalize(half_vector))";
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// Note: the half angle vector projection is confirmed not normalized before the dot
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// product. The result is in fact not cos(phi) as the name suggested.
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index = "dot(" + half_angle_proj + ", tangent)";
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