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Assets/Alloy/Shaders/Feature/Puddles.cginc

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+// Alloy Physical Shader Framework
+// Copyright 2013-2017 RUST LLC.
+// http://www.alloy.rustltd.com/
+
+/////////////////////////////////////////////////////////////////////////////////
+/// @file Puddles.cginc
+/// @brief Handles all puddle material effects.
+/////////////////////////////////////////////////////////////////////////////////
+
+#ifndef ALLOY_SHADERS_FEATURE_PUDDLES_CGINC
+#define ALLOY_SHADERS_FEATURE_PUDDLES_CGINC
+
+#if !defined(A_PUDDLES_ON) && defined(_PUDDLES_ON)
+    #define A_PUDDLES_ON
+#endif
+
+#include "Assets/Alloy/Shaders/Framework/Feature.cginc"
+
+#ifdef A_PUDDLES_ON
+    A_SAMPLER_2D(_PuddlesRippleTex);
+
+    // Mask
+
+    half _PuddlesWeight;
+
+    half _PuddlesRippleWeight;
+
+    // Wetness
+
+    // Wet Tint
+
+    // Wet roughness.
+
+    half _PuddlesLevel;
+
+    // Puddle Roughness
+#endif
+
+void aPuddles(
+    inout ASurface s) 
+{
+#ifdef A_PUDDLES_ON
+    half mask = _PuddlesWeight * s.vertexColor.a * s.mask;
+
+    // Physically-based puddles. 
+    // cf https://seblagarde.wordpress.com/2013/01/03/water-drop-2b-dynamic-rain-and-its-effects/
+
+    // Wetness
+
+    // Unity uses a Left-handed axis, so it requires clumsy remapping.
+    //const half3x3 yTangentToWorld = half3x3(A_AXIS_X, A_AXIS_Z, s.vertexNormalWorld);
+    //float2 rippleUv = A_TEX_TRANSFORM_SCROLL(_RippleTex, s.positionWorld.xz);
+    //half3 ripples = lerp(A_FLAT_NORMAL, tex2D(_RippleTex, rippleUv) * 2.0h - 1.0h, _PuddlesRippleWeight);
+
+    //ripples = mul(ripples, yTangentToWorld);
+    //ripples = aWorldToTangent(s, ripples);
+
+    //half puddles = _PuddlesLevel * mask;
+
+    //s.normalTangent = A_NT(s, normalize(lerp(s.normalTangent, ripples, puddles)));
+#endif
+} 
+
+#endif // ALLOY_SHADERS_FEATURE_PUDDLES_CGINC