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Assets/Alloy/Shaders/Feature/Emission.cginc

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+// Alloy Physical Shader Framework
+// Copyright 2013-2017 RUST LLC.
+// http://www.alloy.rustltd.com/
+
+/////////////////////////////////////////////////////////////////////////////////
+/// @file Emission.cginc
+/// @brief Surface emission effects.
+/////////////////////////////////////////////////////////////////////////////////
+
+#ifndef ALLOY_SHADERS_FEATURE_EMISSION_CGINC
+#define ALLOY_SHADERS_FEATURE_EMISSION_CGINC
+
+#if !defined(A_EMISSION_ON) && defined(_EMISSION)
+    #define A_EMISSION_ON
+#endif
+
+#ifdef A_EMISSION_ON
+    #ifndef A_EMISSIVE_COLOR_ON
+        #define A_EMISSIVE_COLOR_ON
+    #endif
+#endif
+
+#include "Assets/Alloy/Shaders/Framework/Feature.cginc"
+
+#ifdef A_EMISSION_ON
+    /// Emission tint color.
+    /// Expects a linear LDR color.
+    half3 _EmissionColor;
+
+    #ifndef A_EMISSION_MASK_MAP_OFF
+        /// Emission mask texture.
+        /// Expects an RGB map with sRGB sampling.
+        sampler2D _EmissionMap;
+    #endif
+
+    #ifndef A_EMISSION_EFFECTS_MAP_OFF
+        /// Emission effect texture.
+        /// Expects an RGB map with sRGB sampling.
+        A_SAMPLER_2D(_IncandescenceMap);
+    #endif
+    
+    /// The weight of the emission effect.
+    /// Expects linear space value in the range [0,1].
+    half _EmissionWeight;
+#endif
+
+void aEmission(
+    inout ASurface s)
+{
+#ifdef A_EMISSION_ON 
+    half3 emission = _EmissionColor;
+
+    #ifndef A_EMISSION_MASK_MAP_OFF
+        emission *= tex2D(_EmissionMap, s.baseUv).rgb;
+    #endif
+
+    #ifndef A_EMISSION_EFFECTS_MAP_OFF
+        float2 incandescenceUv = A_TEX_TRANSFORM_UV_SCROLL(s, _IncandescenceMap);
+        emission *= tex2D(_IncandescenceMap, incandescenceUv).rgb;
+    #endif
+    
+    s.emissiveColor += emission * (_EmissionWeight * s.mask);
+#endif
+} 
+
+#endif // ALLOY_SHADERS_FEATURE_EMISSION_CGINC