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Assets/Alloy/Shaders/Feature/Dissolve.cginc

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+// Alloy Physical Shader Framework
+// Copyright 2013-2017 RUST LLC.
+// http://www.alloy.rustltd.com/
+
+/////////////////////////////////////////////////////////////////////////////////
+/// @file Dissolve.cginc
+/// @brief Surface dissolve effects.
+/////////////////////////////////////////////////////////////////////////////////
+
+#ifndef ALLOY_SHADERS_FEATURE_DISSOLVE_CGINC
+#define ALLOY_SHADERS_FEATURE_DISSOLVE_CGINC
+
+#if !defined(A_DISSOLVE_ON) && defined(_DISSOLVE_ON)
+    #define A_DISSOLVE_ON
+#endif
+
+#ifdef A_DISSOLVE_ON
+    #ifndef A_OPACITY_MASK_ON
+        #define A_OPACITY_MASK_ON
+    #endif
+
+    #ifndef A_EMISSIVE_COLOR_ON
+        #define A_EMISSIVE_COLOR_ON
+    #endif
+#endif
+
+#include "Assets/Alloy/Shaders/Framework/Feature.cginc"
+
+#ifdef A_DISSOLVE_ON
+    /// Dissolve glow tint color.
+    /// Expects a linear HDR color with alpha.
+    half4 _DissolveGlowColor; 
+    
+    /// Dissolve glow color with effect ramp in the alpha.
+    /// Expects an RGBA map with sRGB sampling.
+    A_SAMPLER_2D(_DissolveTex);
+    
+    /// The cutoff value for the dissolve effect in the ramp map.
+    /// Expects values in the range [0,1].
+    half _DissolveCutoff;
+
+    #ifndef A_DISSOLVE_GLOW_OFF
+        /// The weight of the dissolve glow effect.
+        /// Expects linear space value in the range [0,1].
+        half _DissolveGlowWeight;
+    
+        /// The width of the dissolve glow effect.
+        /// Expects values in the range [0,1].
+        half _DissolveEdgeWidth;
+    #endif
+#endif
+
+void aDissolve(
+    inout ASurface s) 
+{
+#ifdef A_DISSOLVE_ON
+    float2 dissolveUv = A_TEX_TRANSFORM_UV(s, _DissolveTex);
+    half4 dissolveBase = _DissolveGlowColor * tex2D(_DissolveTex, dissolveUv);
+    half dissolveCutoff = s.mask * _DissolveCutoff;
+    half clipval = dissolveBase.a * 0.99h - dissolveCutoff;
+
+    clip(clipval); // NOTE: Eliminates need for blend edge.
+        
+	#ifndef A_DISSOLVE_GLOW_OFF
+		// Dissolve glow
+        half3 glow = s.emissiveColor + dissolveBase.rgb * _DissolveGlowWeight;
+
+        glow = clipval >= _DissolveEdgeWidth ? s.emissiveColor : glow; // Outer edge.
+        s.emissiveColor = dissolveCutoff < A_EPSILON ? s.emissiveColor : glow; // Kill when cutoff is zero.
+    #endif
+#endif
+} 
+
+#endif // ALLOY_SHADERS_FEATURE_DISSOLVE_CGINC