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Assets/Alloy/Shaders/Feature/SkinTextures.cginc

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+// Alloy Physical Shader Framework
+// Copyright 2013-2017 RUST LLC.
+// http://www.alloy.rustltd.com/
+
+/////////////////////////////////////////////////////////////////////////////////
+/// @file SkinTextures.cginc
+/// @brief Main set of textures for Skin shaders.
+/////////////////////////////////////////////////////////////////////////////////
+
+#ifndef ALLOY_SHADERS_FEATURE_SKIN_TEXTURES_CGINC
+#define ALLOY_SHADERS_FEATURE_SKIN_TEXTURES_CGINC
+
+#ifdef A_SKIN_TEXTURES_ON
+    #ifndef A_METALLIC_ON
+        #define A_METALLIC_ON
+    #endif
+
+    #ifndef A_AMBIENT_OCCLUSION_ON
+        #define A_AMBIENT_OCCLUSION_ON
+    #endif
+
+    #ifndef A_SUBSURFACE_ON
+        #define A_SUBSURFACE_ON
+    #endif
+
+    #ifndef A_SCATTERING_ON
+        #define A_SCATTERING_ON
+    #endif
+#endif
+
+#include "Assets/Alloy/Shaders/Framework/Feature.cginc"
+
+void aSkinTextures(
+    inout ASurface s)
+{
+#ifdef A_SKIN_TEXTURES_ON
+    half4 base = aBase(s);
+
+    s.baseColor = base.rgb;
+    s.subsurface = A_SS(s, base.a);
+    s.opacity = 1.0h - base.a;
+    aCutout(s);
+
+    half4 material = aSampleMaterial(s);
+
+    s.metallic = _Metal * material.A_METALLIC_CHANNEL;
+    s.ambientOcclusion = aLerpOneTo(material.A_AO_CHANNEL, _Occlusion);
+    s.specularity = _Specularity * material.A_SPECULARITY_CHANNEL;
+    s.roughness = _Roughness * material.A_ROUGHNESS_CHANNEL;
+
+    // Jon Moore recommends a mip bias of 3.0 for blurred skin normals.
+    // http://www.gamasutra.com/view/news/128934/Indepth_Skin_shading_in_Unity3D.php
+    s.normalTangent = A_NT(s, aSampleBump(s));
+    s.blurredNormalTangent = aSampleBumpBias(s, 3.0f);
+#endif
+}
+
+#endif // ALLOY_SHADERS_FEATURE_SKIN_TEXTURES_CGINC