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88 行
3.2 KiB
88 行
3.2 KiB
// AMD recommand this value for GCN http://amd-dev.wpengine.netdna-cdn.com/wordpress/media/2013/05/GCNPerformanceTweets.pdf
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#define MAX_TESSELLATION_FACTORS 15.0
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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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// ref: http://reedbeta.com/blog/tess-quick-ref/
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// x - 1->2 edge
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// y - 2->0 edge
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// z - 0->1 edge
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// w - inside tessellation factor
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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] = min(tf.x, MAX_TESSELLATION_FACTORS);
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output.edge[1] = min(tf.y, MAX_TESSELLATION_FACTORS);
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output.edge[2] = min(tf.z, MAX_TESSELLATION_FACTORS);
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output.inside = min(tf.w, MAX_TESSELLATION_FACTORS);
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return output;
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}
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[maxtessfactor(MAX_TESSELLATION_FACTORS)]
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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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#ifdef _TESSELLATION_PHONG
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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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#ifdef HAVE_TESSELLATION_MODIFICATION
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// TODO: This should be an uniform for the object, this code should be remove (and is specific to Lit.shader) once we have it. - Workaround for now
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// Extract scaling from world transform
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#ifdef _VERTEX_DISPLACEMENT_OBJECT_SCALE
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float3 objectScale = varying.vmesh.objectScale;
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#else
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float3 objectScale = float3(1.0, 1.0, 1.0);
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#endif
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ApplyTessellationModification(varying.vmesh, varying.vmesh.normalWS, objectScale, varying.vmesh.positionWS);
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#endif
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return VertTesselation(varying);
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}
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