wehub-resource-sync
47 lines
1.0 KiB
HLSL
47 lines
1.0 KiB
HLSL
#include "shared/hash-functions.hlsl"
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#include "shared/point.hlsl"
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#include "shared/bias-functions.hlsl"
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cbuffer Params : register(b0)
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{
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float Amount;
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float Acelleration;
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float MinSpeed;
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float MaxSpeed;
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float Variation;
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float2 VariationGainAndBias;
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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 maxParticleCount, _;
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Particles.GetDimensions(maxParticleCount, _);
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if(i.x >= maxParticleCount)
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return;
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float3 velocity = Particles[i.x].Velocity;
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float speed = length(velocity);
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// Rather do nothing...
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if(speed < 0.0001)
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return;
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float3 dir = normalize(velocity);
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float rand = hash11u(i.x);
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float randBias = ApplyGainAndBias(rand, VariationGainAndBias);
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float3 variationFactor = (1 - (1-randBias) * saturate(Variation));
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float strength = Amount * variationFactor;
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speed += Acelleration * 0.02 * strength;
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speed = clamp(speed, MinSpeed, MaxSpeed);
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Particles[i.x].Velocity = dir * speed;
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}
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