90 lines
2.9 KiB
HLSL
90 lines
2.9 KiB
HLSL
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// Optimized vertex input structur
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struct appdata_grassinstanced {
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float4 vertex : POSITION;
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//float4 tangent : TANGENT;
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float3 normal : NORMAL;
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float2 texcoord : TEXCOORD0;
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//float4 texcoord1 : TEXCOORD1;
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//float4 texcoord2 : TEXCOORD2; // GI
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//float4 texcoord3 : TEXCOORD3;
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fixed4 color : COLOR;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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// Generalized custom CBUFFER
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CBUFFER_START(AtgGrass)
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float4 _AtgWindDirSize;
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float4 _AtgWindStrengthMultipliers;
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float4 _AtgSinTime;
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float4 _AtgGrassFadeProps;
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float4 _AtgGrassShadowFadeProps;
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float3 _AtgSurfaceCameraPosition;
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CBUFFER_END
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// This should not be part of the cbuffer due to ps4
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sampler2D _AtgWindRT;
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float4 _AtgTerrainShiftSurface;
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// StructuredBuffers needed by IndirectInstancing
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#ifdef UNITY_PROCEDURAL_INSTANCING_ENABLED
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StructuredBuffer<float4x4> GrassMatrixBuffer;
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#endif
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// Vertex to Fragment struct
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#if defined(ISGRASS)
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struct Input {
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#if defined(GRASSUSESTEXTUREARRAYS)
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float2 uv_MainTexArray;
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#else
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float2 uv_MainTex;
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#endif
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//float fade;
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float scale;
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float occ;
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float layer;
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fixed4 color; // : COLOR0;
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};
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#endif
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// Setup function for IndirectInstancing
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#if !defined(DONOTUSE_ATGSETUP)
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void setup() {
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#ifdef UNITY_PROCEDURAL_INSTANCING_ENABLED
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float4x4 data = GrassMatrixBuffer[unity_InstanceID];
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unity_ObjectToWorld = data;
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// Handle Floating Origin
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// randPivot does not work out properly when using compute and floating origin for some reason :( - so we use size instead.
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// float usesCompute = 1.0 - _AtgTerrainShiftSurface.w; // 1 if usesCompute, else 0
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// randPivot = float2(unity_ObjectToWorld[0].w + _AtgTerrainShiftSurface.x * usesCompute, unity_ObjectToWorld[2].w + _AtgTerrainShiftSurface.z * usesCompute);
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float3 shift = _AtgTerrainShiftSurface.xyz * _AtgTerrainShiftSurface.w; // w = 0 when compute / 1 when no compute
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unity_ObjectToWorld[0].w -= shift.x;
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unity_ObjectToWorld[1].w -= shift.y;
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unity_ObjectToWorld[2].w -= shift.z;
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// Restore matrix as it could contain layer data here!
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InstanceScale = frac(unity_ObjectToWorld[3].w);
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TextureLayer = unity_ObjectToWorld[3].w - InstanceScale;
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InstanceScale *= 100.0f;
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#if defined(_NORMAL)
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terrainNormal = unity_ObjectToWorld[3].xyz;
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#endif
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unity_ObjectToWorld[3] = float4(0, 0, 0, 1.0f);
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// Bullshit!
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// unity_WorldToObject = unity_ObjectToWorld;
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// unity_WorldToObject._14_24_34 *= -1;
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// unity_WorldToObject._11_22_33 = 1.0f / unity_WorldToObject._11_22_33;
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// Not correct but good enough to get the wind direction in object space
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unity_WorldToObject = unity_ObjectToWorld;
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unity_WorldToObject._14_24_34 = 1.0f / unity_WorldToObject._14_24_34;
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unity_WorldToObject._11_22_33 *= -1;
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// Seems to be rather cheap - on: 34 / off 36fps
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//unity_WorldToObject = inverseMat(unity_ObjectToWorld); //inverspositionBuffer[unity_InstanceID];
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#endif
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}
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#endif
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