wehub-resource-sync
59 lines
1.6 KiB
HLSL
59 lines
1.6 KiB
HLSL
#include "shared/hash-functions.hlsl"
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#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 ApplyTrigger;
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float Strength;
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float RandomizeStrength;
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float SelectRatio;
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float3 AxisDistribution;
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float AddOriginalVelocity;
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float3 StrengthDistribution;
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float Seed;
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float AxisSpace;
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}
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RWStructuredBuffer<Particle> Particles : u0;
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[numthreads(64,1,1)]
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void main(uint3 i : SV_DispatchThreadID)
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{
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uint gi = i.x;
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uint maxParticleCount, _;
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Particles.GetDimensions(maxParticleCount, _);
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if(gi >= maxParticleCount) {
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return;
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}
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float4 randForPos = hash41u(gi + (uint)Seed * 1103515245U);
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float4 randForEffects = hash41u(gi + (uint)Seed * 1103515245U+ 83339);
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float selected = randForPos.w < SelectRatio ? 1 : 0;
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float f = selected* Strength * (1+ RandomizeStrength * (randForEffects.r - 0.5));
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float3 axis = abs(randForPos.zyx * AxisDistribution);
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float3 direction = axis.x > axis.y ? (axis.x > axis.z ? float3(1,0,0) : float3(0,0,1))
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: (axis.y > axis.z ? float3(0,1,0) : float3(0,0,1));
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direction *= (randForEffects.g < 0.5 ? 1 : -1) * StrengthDistribution * f;
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if(AxisSpace < 0.5) {
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}
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else if(AxisSpace < 1.5)
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{
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direction = qRotateVec3(direction, Particles[gi].Rotation);
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}
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float3 origVelocity = Particles[gi].Velocity;
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Particles[gi].Velocity = lerp( origVelocity,
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origVelocity* AddOriginalVelocity + direction * f,
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ApplyTrigger * selected);
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}
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