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Assets/Alloy/Shaders/Feature/Rim.cginc

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+// Alloy Physical Shader Framework
+// Copyright 2013-2017 RUST LLC.
+// http://www.alloy.rustltd.com/
+
+/////////////////////////////////////////////////////////////////////////////////
+/// @file Rim.cginc
+/// @brief Rim lighting effects.
+/////////////////////////////////////////////////////////////////////////////////
+
+#ifndef ALLOY_SHADERS_FEATURE_RIM_CGINC
+#define ALLOY_SHADERS_FEATURE_RIM_CGINC
+
+#if !defined(A_RIM_ON) && defined(_RIM_ON)
+    #define A_RIM_ON
+#endif
+
+#ifdef A_RIM_ON
+    #ifndef A_NORMAL_WORLD_ON
+        #define A_NORMAL_WORLD_ON
+    #endif
+
+    #ifndef A_VIEW_DIR_WORLD_ON
+        #define A_VIEW_DIR_WORLD_ON
+    #endif
+
+    #ifndef A_EMISSIVE_COLOR_ON
+        #define A_EMISSIVE_COLOR_ON
+    #endif
+#endif
+
+#include "Assets/Alloy/Shaders/Framework/Feature.cginc"
+
+#ifdef A_RIM_ON
+    /// Rim lighting tint color.
+    /// Expects a linear HDR color.
+    half3 _RimColor;
+
+    #ifndef A_RIM_EFFECTS_MAP_OFF
+        /// Rim effect texture.
+        /// Expects an RGB map with sRGB sampling.
+        A_SAMPLER_2D(_RimTex);
+    #endif
+    
+    /// The weight of the rim lighting effect.
+    /// Expects linear space value in the range [0,1].
+    half _RimWeight;
+    
+    /// Fills in the center of the rim lighting effect.
+    /// Expects linear-space values in the range [0,1].
+    half _RimBias;
+    
+    /// Controls the falloff of the rim lighting effect.
+    /// Expects values in the range [0.01,n].
+    half _RimPower;
+#endif
+
+void aRim(
+    inout ASurface s)
+{	
+#ifdef A_RIM_ON 
+    half3 rim = _RimColor;
+
+    #ifndef A_RIM_EFFECTS_MAP_OFF
+        float2 rimUv = A_TEX_TRANSFORM_UV_SCROLL(s, _RimTex);
+        rim *= tex2D(_RimTex, rimUv).rgb;
+    #endif
+    
+    s.emissiveColor += rim * aRimLight(_RimWeight * s.mask, _RimBias, _RimPower, s.NdotV);
+#endif
+} 
+
+#endif // ALLOY_SHADERS_FEATURE_RIM_CGINC