Optimize sh9 implementation

Saves ~20 instructions (572 -> 552).

1 files changed, 0 insertions, 24 deletions

diff --git a/filamented.cginc b/filamented.cginc
index fb019cb..f6bd67a 100644
--- a/filamented.cginc
+++ b/filamented.cginc
@@ -213,30 +213,6 @@
 #include "UnityCG.cginc"
 #include "UnityImageBasedLightingMinimal.cginc"
 
-float normalFiltering(float perceptualRoughness, const float3 worldNormal) {
-    // Kaplanyan 2016, "Stable specular highlights"
-    // Tokuyoshi 2017, "Error Reduction and Simplification for Shading Anti-Aliasing"
-    // Tokuyoshi and Kaplanyan 2019, "Improved Geometric Specular Antialiasing"
-
-    // This implementation is meant for deferred rendering in the original paper but
-    // we use it in forward rendering as well (as discussed in Tokuyoshi and Kaplanyan
-    // 2019). The main reason is that the forward version requires an expensive transform
-    // of the half vector by the tangent frame for every light. This is therefore an
-    // approximation but it works well enough for our needs and provides an improvement
-    // over our original implementation based on Vlachos 2015, "Advanced VR Rendering".
-
-    float3 du = ddx(worldNormal);
-    float3 dv = ddy(worldNormal);
-
-    float variance = _Specular_AA_Variance * (dot(du, du) + dot(dv, dv));
-
-    float roughness = perceptualRoughnessToRoughness(perceptualRoughness);
-    float kernelRoughness = min(2.0 * variance, _Specular_AA_Threshold);
-    float squareRoughness = saturate(roughness * roughness + kernelRoughness);
-
-    return roughnessToPerceptualRoughness(sqrt(squareRoughness));
-}
-
 half3 Unity_GlossyEnvironment_local (UNITY_ARGS_TEXCUBE(tex), half4 hdr, Unity_GlossyEnvironmentData glossIn)
 {
 	half perceptualRoughness = glossIn.roughness /* perceptualRoughness */ ;