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Assets/Alloy/Shaders/Feature/AO2.cginc

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+// Alloy Physical Shader Framework
+// Copyright 2013-2017 RUST LLC.
+// http://www.alloy.rustltd.com/
+
+/////////////////////////////////////////////////////////////////////////////////
+/// @file AO2.cginc
+/// @brief Secondary Ambient Occlusion, possibly on a different UV.
+/////////////////////////////////////////////////////////////////////////////////
+
+#ifndef ALLOY_SHADERS_FEATURE_AO2_CGINC
+#define ALLOY_SHADERS_FEATURE_AO2_CGINC
+
+#if !defined(A_AO2_ON) && defined(_AO2_ON)
+    #define A_AO2_ON
+#endif
+
+#ifdef A_AO2_ON
+    #ifndef A_AMBIENT_OCCLUSION_ON
+        #define A_AMBIENT_OCCLUSION_ON
+    #endif
+#endif
+
+#include "Assets/Alloy/Shaders/Framework/Feature.cginc"
+
+#ifdef A_AO2_ON
+    /// Secondary Ambient Occlusion map.
+    /// Expects an RGB map with sRGB sampling
+    A_SAMPLER_2D(_Ao2Map);
+
+    /// Ambient Occlusion strength.
+    /// Expects values in the range [0,1].
+    half _Ao2Occlusion;
+#endif
+
+void aAo2(
+    inout ASurface s) 
+{
+#ifdef A_AO2_ON
+    float2 ao2Uv = A_TEX_TRANSFORM_UV(s, _Ao2Map);
+    s.ambientOcclusion *= aLerpOneTo(tex2D(_Ao2Map, ao2Uv).g, _Ao2Occlusion * s.mask);
+#endif
+} 
+
+#endif // ALLOY_SHADERS_FEATURE_AO2_CGINC