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97 行
3.5 KiB
97 行
3.5 KiB
#ifndef WATER_TESSELLATION_INCLUDED
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#define WATER_TESSELLATION_INCLUDED
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///////////////////////////////////////////////////////////////////////////////
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// Structs //
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///////////////////////////////////////////////////////////////////////////////
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struct TessellationControlPoint
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{
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float4 positionOS : INTERNALTESSPOS;
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float4 texcoord : TEXCOORD0; // Geometric UVs stored in xy, and world(pre-waves) in zw
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float3 positionWS : TEXCOORD1; // world position of the vertices
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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struct HS_ConstantOutput
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{
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float TessFactor[3] : SV_TessFactor;
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float InsideTessFactor : SV_InsideTessFactor;
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};
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///////////////////////////////////////////////////////////////////////////////
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// Tessellation functions //
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///////////////////////////////////////////////////////////////////////////////
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half _TessellationEdgeLength;
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float TessellationEdgeFactor (float3 p0, float3 p1)
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{
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float edgeLength = distance(p0, p1);
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float3 edgeCenter = (p0 + p1) * 0.5;
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float viewDistance = distance(edgeCenter, _WorldSpaceCameraPos);
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return edgeLength * _ScreenParams.y / (_TessellationEdgeLength * viewDistance);
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}
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TessellationControlPoint TessellationVertex( Attributes input )
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{
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TessellationControlPoint output;
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output.positionWS = TransformObjectToWorld(input.positionOS.xyz);
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output.positionOS = input.positionOS;
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output.texcoord.xy = input.texcoord;
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output.texcoord.zw = output.positionWS.xz;
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return output;
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}
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HS_ConstantOutput HSConstant( InputPatch<TessellationControlPoint, 3> Input )
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{
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float3 p0 = TransformObjectToWorld(Input[0].positionOS.xyz);
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float3 p1 = TransformObjectToWorld(Input[1].positionOS.xyz);
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float3 p2 = TransformObjectToWorld(Input[2].positionOS.xyz);
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HS_ConstantOutput output = (HS_ConstantOutput)0;
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output.TessFactor[0] = TessellationEdgeFactor(p1, p2);
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output.TessFactor[1] = TessellationEdgeFactor(p2, p0);
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output.TessFactor[2] = TessellationEdgeFactor(p0, p1);
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output.InsideTessFactor = (TessellationEdgeFactor(p1, p2) +
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TessellationEdgeFactor(p2, p0) +
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TessellationEdgeFactor(p0, p1)) * (1 / 3.0);
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return output;
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}
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[domain("tri")]
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[partitioning("fractional_odd")]
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[outputtopology("triangle_cw")]
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[patchconstantfunc("HSConstant")]
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[outputcontrolpoints(3)]
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TessellationControlPoint Hull( InputPatch<TessellationControlPoint, 3> Input, uint uCPID : SV_OutputControlPointID )
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{
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return Input[uCPID];
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}
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// Domain: replaces vert for tessellation version
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[domain("tri")]
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Varyings Domain( HS_ConstantOutput HSConstantData, const OutputPatch<TessellationControlPoint, 3> input, float3 BarycentricCoords : SV_DomainLocation)
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{
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Varyings output = (Varyings)0;
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UNITY_SETUP_INSTANCE_ID(input);
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UNITY_TRANSFER_INSTANCE_ID(input, output);
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UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);
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/////////////////////Tessellation////////////////////////
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float fU = BarycentricCoords.x;
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float fV = BarycentricCoords.y;
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float fW = BarycentricCoords.z;
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float4 vertex = input[0].positionOS * fU + input[1].positionOS * fV + input[2].positionOS * fW;
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output.uv = input[0].texcoord * fU + input[1].texcoord * fV + input[2].texcoord * fW;
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output.positionWS = input[0].positionWS * fU + input[1].positionWS * fV + input[2].positionWS * fW;
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output = WaveVertexOperations(output);
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return output;
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}
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#endif // WATER_TESSELLATION_INCLUDED
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