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74 行
2.5 KiB
74 行
2.5 KiB
struct TessellationFactors
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{
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float edge[3] : SV_TessFactor;
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float inside : SV_InsideTessFactor;
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};
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TessellationFactors HullConstant(InputPatch<PackedVaryingsToDS, 3> input)
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{
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VaryingsToDS varying0 = UnpackVaryingsToDS(input[0]);
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VaryingsToDS varying1 = UnpackVaryingsToDS(input[1]);
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VaryingsToDS varying2 = UnpackVaryingsToDS(input[2]);
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float3 p0 = varying0.vmesh.positionWS;
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float3 p1 = varying1.vmesh.positionWS;
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float3 p2 = varying2.vmesh.positionWS;
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float3 n0 = varying0.vmesh.normalWS;
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float3 n1 = varying1.vmesh.normalWS;
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float3 n2 = varying2.vmesh.normalWS;
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float4 tf = GetTessellationFactors(p0, p1, p2, n0, n1, n2);
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TessellationFactors output;
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output.edge[0] = tf.x;
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output.edge[1] = tf.y;
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output.edge[2] = tf.z;
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output.inside = tf.w;
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return output;
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}
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[maxtessfactor(15.0)] // AMD recommand this value for GCN http://amd-dev.wpengine.netdna-cdn.com/wordpress/media/2013/05/GCNPerformanceTweets.pdf
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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("HullConstant")]
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[outputcontrolpoints(3)]
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PackedVaryingsToDS Hull(InputPatch<PackedVaryingsToDS, 3> input, uint id : SV_OutputControlPointID)
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{
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// Pass-through
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return input[id];
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}
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[domain("tri")]
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PackedVaryingsToPS Domain(TessellationFactors tessFactors, const OutputPatch<PackedVaryingsToDS, 3> input, float3 baryCoords : SV_DomainLocation)
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{
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VaryingsToDS varying0 = UnpackVaryingsToDS(input[0]);
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VaryingsToDS varying1 = UnpackVaryingsToDS(input[1]);
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VaryingsToDS varying2 = UnpackVaryingsToDS(input[2]);
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VaryingsToDS varying = InterpolateWithBaryCoordsToDS(varying0, varying1, varying2, baryCoords);
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// We have Phong tessellation in all case where we don't have displacement only
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#ifndef _TESSELLATION_DISPLACEMENT
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float3 p0 = varying0.vmesh.positionWS;
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float3 p1 = varying1.vmesh.positionWS;
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float3 p2 = varying2.vmesh.positionWS;
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float3 n0 = varying0.vmesh.normalWS;
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float3 n1 = varying1.vmesh.normalWS;
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float3 n2 = varying2.vmesh.normalWS;
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varying.vmesh.positionWS = PhongTessellation( varying.vmesh.positionWS,
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p0, p1, p2, n0, n1, n2,
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baryCoords, _TessellationShapeFactor);
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#endif
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#if defined(_TESSELLATION_DISPLACEMENT) || defined(_TESSELLATION_DISPLACEMENT_PHONG)
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varying.vmesh.positionWS += GetDisplacement(varying.vmesh);
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#endif
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return VertTesselation(varying);
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}
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