Initial commit

2026-06-03 04:34:26 -07:00 · 2022-01-22 20:13:49 -08:00
parent f9d23e5bcf
commit 687473573d
878 changed files with 70957 additions and 0 deletions
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+// Alloy Physical Shader Framework
+// Copyright 2013-2017 RUST LLC.
+// http://www.alloy.rustltd.com/
+
+/////////////////////////////////////////////////////////////////////////////////
+/// @file Terrain.cginc
+/// @brief Unity terrain mapping.
+/////////////////////////////////////////////////////////////////////////////////
+
+#ifndef ALLOY_SHADERS_FEATURE_TERRAIN_CGINC
+#define ALLOY_SHADERS_FEATURE_TERRAIN_CGINC
+
+#ifdef A_TERRAIN_ON
+    #ifndef A_ROUGHNESS_SOURCE_BASE_COLOR_ALPHA
+        #define A_ROUGHNESS_SOURCE_BASE_COLOR_ALPHA
+    #endif
+
+    #ifndef A_TERRAIN_DISTANT
+        #ifndef A_VIEW_DEPTH_ON
+            #define A_VIEW_DEPTH_ON
+        #endif
+    #else
+        // Needed for detail normal map.
+        #ifndef A_NORMAL_MAPPING_ON
+            #define A_NORMAL_MAPPING_ON 
+        #endif
+    #endif
+
+    #ifndef A_METALLIC_ON
+        #define A_METALLIC_ON
+    #endif
+
+    #ifndef A_SPECULAR_TINT_ON
+        #define A_SPECULAR_TINT_ON
+    #endif
+#endif
+
+#include "Assets/Alloy/Shaders/Framework/Feature.cginc"
+
+#ifdef A_TERRAIN_ON
+    #ifdef A_TERRAIN_DISTANT
+        sampler2D _MetallicTex;
+    #else
+        A_SAMPLER_2D(_Control);
+        half _TriplanarBlendSharpness;
+    
+        A_SAMPLER_2D(_Splat0);
+        sampler2D _Normal0;
+        half _Metallic0;
+        half _SplatSpecularity0;
+        half _SplatSpecularTint0;
+
+        A_SAMPLER_2D(_Splat1);
+        sampler2D _Normal1;
+        half _Metallic1;
+        half _SplatSpecularity1;
+        half _SplatSpecularTint1;
+
+        A_SAMPLER_2D(_Splat2);
+        sampler2D _Normal2;
+        half _Metallic2;
+        half _SplatSpecularity2;
+        half _SplatSpecularTint2;
+
+        A_SAMPLER_2D(_Splat3);
+        sampler2D _Normal3;
+        half _Metallic3;
+        half _SplatSpecularity3;
+        half _SplatSpecularTint3;
+    
+        half _FadeDist;
+        half _FadeRange;
+    #endif
+
+    half _DistantSpecularity;
+    half _DistantSpecularTint;
+    half _DistantRoughness;
+#endif
+
+void aTerrain(
+    inout ASurface s) 
+{
+#ifdef A_TERRAIN_ON
+    #ifdef A_TERRAIN_DISTANT
+        half4 col = aSampleBase(s);
+    
+        s.baseColor = col.rgb;
+        s.metallic = tex2D (_MetallicTex, s.baseUv).r;	
+        s.specularity = _DistantSpecularity;
+        s.specularTint = _DistantSpecularTint;
+        s.roughness = col.a * _DistantRoughness;
+    #else
+        // Create a smooth blend between near and distant terrain to hide transition.
+        // NOTE: Can't kill specular completely since we have to worry about deferred.
+        half fade = saturate((s.viewDepth - _FadeDist) / _FadeRange);
+        half4 splatControl = tex2D(_Control, A_TEX_TRANSFORM(s, _Control));
+        half weight = dot(splatControl, A_ONE4);
+    
+        #if !defined(SHADER_API_MOBILE) && defined(A_TERRAIN_NSPLAT_ADDPASS_SHADER)
+            clip(weight == 0.0f ? -1 : 1);
+        #endif
+
+        // NOTE: 0.01 matches tiling of distant terrain combined maps.
+        ASplatContext sc = aNewSplatContext(s, _TriplanarBlendSharpness, 0.01f);
+        ASplat sp0 = aNewSplat(sc, A_SAMPLER_2D_INPUT(_Splat0), _Splat0, _Normal0, A_WHITE4, 0.0h, _Metallic0, _SplatSpecularity0, _SplatSpecularTint0, 1.0h, 1.0h, 1.0h);
+        ASplat sp1 = aNewSplat(sc, A_SAMPLER_2D_INPUT(_Splat1), _Splat1, _Normal1, A_WHITE4, 0.0h, _Metallic1, _SplatSpecularity1, _SplatSpecularTint1, 1.0h, 1.0h, 1.0h);
+        ASplat sp2 = aNewSplat(sc, A_SAMPLER_2D_INPUT(_Splat2), _Splat2, _Normal2, A_WHITE4, 0.0h, _Metallic2, _SplatSpecularity2, _SplatSpecularTint2, 1.0h, 1.0h, 1.0h);
+        ASplat sp3 = aNewSplat(sc, A_SAMPLER_2D_INPUT(_Splat3), _Splat3, _Normal3, A_WHITE4, 0.0h, _Metallic3, _SplatSpecularity3, _SplatSpecularTint3, 1.0h, 1.0h, 1.0h);
+
+        splatControl /= (weight + A_EPSILON);
+        aApplyTerrainSplats(s, splatControl, sp0, sp1, sp2, sp3);
+        
+        #ifdef A_TERRAIN_NSPLAT_SHADER
+            s.specularity = _DistantSpecularity;
+            s.specularTint = _DistantSpecularTint;
+        #else
+            s.specularity = lerp(s.specularity, _DistantSpecularity, fade);
+            s.specularTint = lerp(s.specularTint, _DistantSpecularTint, fade);
+        #endif
+
+        s.roughness *= aLerpOneTo(_DistantRoughness, fade);
+        s.normalTangent = A_NT(s, normalize(lerp(s.normalTangent, A_FLAT_NORMAL, fade)));
+
+        s.opacity = weight; // Last to avoid being overwritten.
+    #endif
+#endif
+} 
+
+#endif // ALLOY_SHADERS_FEATURE_TERRAIN_CGINC