Initial commit

2026-06-02 20:24:26 -07:00 · 2022-01-22 20:13:49 -08:00
parent f9d23e5bcf
commit 687473573d
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+// Alloy Physical Shader Framework
+// Copyright 2013-2017 RUST LLC.
+// http://www.alloy.rustltd.com/
+
+/////////////////////////////////////////////////////////////////////////////////
+/// @file SpeedTree.cginc
+/// @brief SpeedTree standard material properties.
+/////////////////////////////////////////////////////////////////////////////////
+
+#ifndef ALLOY_SHADERS_FEATURE_SPEED_TREE_CGINC
+#define ALLOY_SHADERS_FEATURE_SPEED_TREE_CGINC
+
+#ifdef A_SPEED_TREE_ON
+    // NOTE: AO on/off determined by matching SpeedTree(Billboard) Model.
+
+    #if defined(GEOM_TYPE_FROND) || defined(GEOM_TYPE_LEAF) || defined(GEOM_TYPE_FACING_LEAF)
+        #ifndef _ALPHATEST_ON
+            #define _ALPHATEST_ON
+        #endif
+
+        #ifndef A_TWO_SIDED_SHADER
+            #define A_TWO_SIDED_SHADER
+        #endif
+
+        #ifndef A_SUBSURFACE_ON
+            #define A_SUBSURFACE_ON
+        #endif
+    #endif
+#endif
+
+#include "Assets/Alloy/Shaders/Framework/Feature.cginc"
+
+#ifdef A_SPEED_TREE_ON
+    #ifdef GEOM_TYPE_BRANCH_DETAIL
+        sampler2D _DetailTex;
+
+        sampler2D _DetailNormalMap;
+    #endif
+
+    #ifdef EFFECT_HUE_VARIATION
+        half4 _HueVariation;
+    #endif
+
+    #ifdef A_SUBSURFACE_ON
+        /// Transmission tint color.
+        /// Expects a linear LDR color.
+        half3 _TransColor;
+
+        /// Transmission color * thickness texture.
+        /// Expects an RGB map with sRGB sampling.
+        sampler2D _TransTex;
+
+        /// Weight of the transmission effect.
+        /// Expects gamma-space values in the range [0,1].
+        half _TransScale;
+    #endif
+#endif
+
+void aSpeedTree(
+    inout ASurface s) 
+{
+#ifdef A_SPEED_TREE_ON
+    half4 base = aSampleBase(s);
+
+    s.baseColor = base.rgb;
+    s.opacity = _Color.a * base.a;
+    aCutout(s);
+
+    // AO content depends on matching Model header.
+    s.ambientOcclusion = s.vertexColor.r;
+    s.normalTangent = A_NT(s, aSampleBump(s));
+
+    #ifdef A_SUBSURFACE_ON
+        s.subsurface = A_SS(s, _TransScale * tex2D(_TransTex, s.baseUv).a);
+        s.subsurfaceColor *= _TransColor;
+    #endif
+
+    #ifdef GEOM_TYPE_BRANCH_DETAIL
+        half4 detailColor = tex2D(_DetailTex, s.uv01.zw);
+        half weight = s.vertexColor.g < 2.0f ? saturate(s.vertexColor.g) : detailColor.a;
+    
+        s.baseColor = lerp(s.baseColor, detailColor.rgb, weight);
+    
+        half3 detailNormals = UnpackScaleNormal(tex2D(_DetailNormalMap, s.uv01.zw), weight);
+        s.normalTangent = A_NT(s, BlendNormals(s.normalTangent, detailNormals));
+    #endif
+
+    #ifdef EFFECT_HUE_VARIATION
+        half3 shiftedColor = lerp(s.baseColor, _HueVariation.rgb, s.vertexColor.b);
+        half maxBase = max(s.baseColor.r, max(s.baseColor.g, s.baseColor.b));
+        half newMaxBase = max(shiftedColor.r, max(shiftedColor.g, shiftedColor.b));
+
+        maxBase /= newMaxBase;
+        maxBase = maxBase * 0.5f + 0.5f;
+
+        // preserve vibrance
+        shiftedColor.rgb *= maxBase;
+        s.baseColor = saturate(shiftedColor);
+    #endif
+
+    s.baseColor *= _Color.rgb;
+#endif
+} 
+
+#endif // ALLOY_SHADERS_FEATURE_SPEED_TREE_CGINC