wehub-resource-sync
77 lines
2.3 KiB
HLSL
77 lines
2.3 KiB
HLSL
#include "shared/point.hlsl"
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#include "shared/quat-functions.hlsl"
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RWStructuredBuffer<LegacyPoint> points :register(u0);
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cbuffer Params : register(b0)
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{
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float Threshold;
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float Dispersion;
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float CellSize;
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float ClampAccelleration;
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float Time;
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}
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#include "points/spatial-hash-map/spatial-hash-map-lookup.hlsl"
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[numthreads( 16, 1, 1 )]
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void DispersePoints(uint3 DTid : SV_DispatchThreadID, uint GI: SV_GroupIndex)
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{
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uint pointCount, stride;
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points.GetDimensions(pointCount, stride);
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if(DTid.x >= pointCount)
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return; // out of bounds
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float3 position = points[DTid.x].Position;
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//float3 jitter = (hash33u( uint3(DTid.x, DTid.x + 134775813U, DTid.x + 1664525U) + Time % 123.12 ) -0.5f) * CellSize * 1;
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float3 jitter = (hash33u( uint3(DTid.x, DTid.x + 134775813U, DTid.x + 1664525U + (int)(Time * 123.12)) ) -0.5f) * CellSize * 2;
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//float3 jitter = (hash31( Time * 1234.37) - 0.5f) * CellSize * 1;
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float3 searchPos = position + jitter;
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uint startIndex, endIndex;
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if(GridFind(searchPos, startIndex, endIndex))
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{
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const uint particleCount = endIndex - startIndex;
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int count =0;
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float3 sumForces = 0;
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endIndex = min(startIndex + 64 , endIndex);
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//return;
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for(uint i=startIndex; i < endIndex; ++i)
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{
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uint pointIndex = CellPointIndices[i];
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if( pointIndex == DTid.x)
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continue;
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float3 otherPos = points[pointIndex].Position;
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float3 direction = position - otherPos;
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float distance = length(direction);
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if(distance <= 0.0001) {
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distance = 0.001;
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}
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if(distance > Threshold)
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continue;
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float force = (Threshold - distance) / Threshold;
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force = pow(force,2);
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sumForces += direction * force;
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count++;
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}
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if(count > 0)
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{
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float acceleration = length(sumForces);
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float3 direction = sumForces / acceleration;
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//sumForces /= count;
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points[DTid.x].Position += direction * (Dispersion * 0.01) * clamp(acceleration, 0, ClampAccelleration);
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//points[DTid.x].w = min(count,3) * 1;
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}
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}
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} |