备份CatanBuilding瘦身独立工程

LocalPackages/zzwater/shaders/libs/WindAnim.hlsl

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+//UNITY_SHADER_NO_UPGRADE
+#ifndef WIND_ANIM_INCLUDE
+#define WIND_ANIM_INCLUDE
+
+inline float4 SmoothCurve( float4 x ) {
+    return x * x *( 3.0 - 2.0 * x );
+}
+
+inline float4 TriangleWave( float4 x ) {
+    return abs( frac( x + 0.5 ) * 2.0 - 1.0 );
+}
+
+inline float4 SmoothTriangleWave( float4 x ) {
+    return SmoothCurve( TriangleWave( x ) );
+}
+
+
+inline float4 ClothWindAnim(float4 pos, float3 normal, float4 animParams,float4 wind,float2 time)
+{	
+    // animParams.x = branch phase
+    // animParams.y = edge flutter factor
+    // animParams.z = primary factor
+    // animParams.w = secondary factor
+
+
+    float fDetailAmp = 0.1f;
+    float fBranchAmp = 0.3f;
+
+    // Phases (object, vertex, branch)
+    float fObjPhase = dot(unity_ObjectToWorld[3].xyz, 1);
+    float fBranchPhase = fObjPhase + animParams.x;
+
+    float fVtxPhase = dot(pos.xyz, animParams.y + fBranchPhase);
+
+    // x is used for edges; y is used for branches
+    float2 vWavesIn = time  + float2(fVtxPhase, fBranchPhase );
+
+    // 1.975, 0.793, 0.375, 0.193 are good frequencies
+    float4 vWaves = (frac( vWavesIn.xxyy * float4(1.975, 0.793, 0.375, 0.193) ) * 2.0 - 1.0);
+
+    vWaves = SmoothTriangleWave( vWaves );
+    float2 vWavesSum = vWaves.xz + vWaves.yw;
+
+    // Edge (xz) and branch bending (y)
+    float3 bend = animParams.y * fDetailAmp * normal.xyz;
+    bend.y = animParams.w * fBranchAmp;
+    pos.xyz += ((vWavesSum.xyx * bend)*wind.w + (wind.xyz * vWavesSum.y * animParams.w)) * wind.w; 
+
+    // Primary bending
+    // Displace position
+    pos.xyz += animParams.z * wind.xyz;
+
+    return pos;
+}
+
+#endif //WIND_ANIM_INCLUDE