wehub-resource-sync
43 lines
1.1 KiB
HLSL
43 lines
1.1 KiB
HLSL
#include "shared/point.hlsl"
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#include "shared/quat-functions.hlsl"
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cbuffer Params : register(b0)
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{
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float AddSeparatorThreshold;
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}
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cbuffer Params2 : register(b1)
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{
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int CycleIndex;
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int TrailLength;
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int PointCount;
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int WriteOrderTo;
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}
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StructuredBuffer<Point> SourcePoints : t0; // input
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RWStructuredBuffer<Point> TrailPoints : u0; // output
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[numthreads(64, 1, 1)] void main(uint3 i : SV_DispatchThreadID)
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{
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int sourceIndex = i.x;
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if (i.x >= PointCount)
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return;
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// uint trailLength = (uint)(TrailLength + 0.5);
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int bufferLength = PointCount * TrailLength;
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int targetIndex = (CycleIndex + sourceIndex * TrailLength) % bufferLength;
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TrailPoints[targetIndex] = SourcePoints[sourceIndex];
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if (AddSeparatorThreshold > 0)
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{
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float3 lastPos = TrailPoints[(targetIndex - 1 + bufferLength) % bufferLength].Position;
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float3 pos = SourcePoints[sourceIndex].Position;
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if (length(lastPos - pos) > AddSeparatorThreshold)
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TrailPoints[targetIndex].Scale = NAN;
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}
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// Flag follow position W as NaN line seperator
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TrailPoints[(targetIndex + 1) % bufferLength].Scale = NAN;
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}
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