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80 行
2.8 KiB
80 行
2.8 KiB
AttributesTesselation VertTesselation(Attributes input)
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{
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return AttributesToAttributesTesselation(input);
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}
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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<AttributesTesselation, 3> input)
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{
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Attributes params[3];
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params[0] = AttributesTesselationToAttributes(input[0]);
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params[1] = AttributesTesselationToAttributes(input[1]);
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params[2] = AttributesTesselationToAttributes(input[2]);
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float4 tf = TesselationEdge(params[0], params[1], params[2]);
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TessellationFactors ouput;
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ouput.edge[0] = tf.x;
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ouput.edge[1] = tf.y;
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ouput.edge[2] = tf.z;
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ouput.inside = tf.w;
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return ouput;
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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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AttributesTesselation Hull(InputPatch<AttributesTesselation, 3> input, uint id : SV_OutputControlPointID)
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{
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return input[id];
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}
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float3 ProjectPointOnPlane(float3 position, float3 planePosition, float3 planeNormal)
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{
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return position - (dot(position - planePosition, planeNormal) * planeNormal);
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}
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// p0, p1, p2 triangle world position
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// p0, p1, p2 triangle world vertex normal
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float3 PhongTessellation(float3 positionWS, float3 p0, float3 p1, float3 p2, float3 n0, float3 n1, float3 n2, float3 baryCoords, float shape)
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{
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float3 c0 = ProjectPointOnPlane(positionWS, p0, n0);
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float3 c1 = ProjectPointOnPlane(positionWS, p1, n1);
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float3 c2 = ProjectPointOnPlane(positionWS, p2, n2);
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float3 phongPositionWS = baryCoords.x * c0 + baryCoords.y * c1 + baryCoords.z * c2;
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return lerp(positionWS, phongPositionWS, shape);
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}
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[domain("tri")]
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PackedVaryings Domain(TessellationFactors tessFactors, const OutputPatch<AttributesTesselation, 3> input, float3 baryCoords : SV_DomainLocation)
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{
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Attributes params = InterpolateWithBaryCoords(input[0], input[1], input[2], baryCoords);
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#ifndef _TESSELATION_DISPLACEMENT // We have Phong tesselation in all case where we don't have only displacement
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#if (SHADERPASS != SHADERPASS_VELOCITY) && (SHADERPASS != SHADERPASS_DISTORTION)
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params.positionOS = PhongTessellation( params.positionOS,
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input[0].positionOS, input[1].positionOS, input[2].positionOS,
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input[0].normalOS, input[1].normalOS, input[2].normalOS,
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baryCoords, _TessellationShapeFactor);
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#endif
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#endif
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// perform displacement
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Displacement(params);
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// Evaluate regular vertex shader
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PackedVaryings outout = Vert(params);
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return outout;
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}
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