94 lines
6.3 KiB
Plaintext
94 lines
6.3 KiB
Plaintext
/*
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██╔══██╗██║░░░░░██╔════╝╚██╗██╔╝██║░░░██║██╔════╝ ██╔══██╗██╔══██╗████╗░████║██╔══██╗██║░░░██║╚══██╔══╝██╔════╝
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██████╔╝██║░░░░░█████╗░░░╚███╔╝░██║░░░██║╚█████╗░ ██║░░╚═╝██║░░██║██╔████╔██║██████╔╝██║░░░██║░░░██║░░░█████╗░░
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██╔═══╝░██║░░░░░██╔══╝░░░██╔██╗░██║░░░██║░╚═══██╗ ██║░░██╗██║░░██║██║╚██╔╝██║██╔═══╝░██║░░░██║░░░██║░░░██╔══╝░░
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╚═╝░░░░░╚══════╝╚══════╝╚═╝░░╚═╝░╚═════╝░╚═════╝░ ░╚════╝░░╚════╝░╚═╝░░░░░╚═╝╚═╝░░░░░░╚═════╝░░░░╚═╝░░░╚══════╝
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░██████╗██╗░░██╗░█████╗░██████╗░███████╗██████╗░
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██╔════╝██║░░██║██╔══██╗██╔══██╗██╔════╝██╔══██╗
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╚█████╗░███████║███████║██║░░██║█████╗░░██████╔╝
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░╚═══██╗██╔══██║██╔══██║██║░░██║██╔══╝░░██╔══██╗
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██████╔╝██║░░██║██║░░██║██████╔╝███████╗██║░░██║
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╚═════╝░╚═╝░░╚═╝╚═╝░░╚═╝╚═════╝░╚══════╝╚═╝░░╚═╝
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█▀▀▄ █──█ ▀▀█▀▀ █──█ █▀▀ ░█▀▀▄ █▀▀ ▀█─█▀ █▀▀ █── █▀▀█ █▀▀█ █▀▀ █▀▀█
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█▀▀▄ █▄▄█ ─░█── █▀▀█ █▀▀ ░█─░█ █▀▀ ─█▄█─ █▀▀ █── █──█ █──█ █▀▀ █▄▄▀
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▀▀▀─ ▄▄▄█ ─░█── ▀──▀ ▀▀▀ ░█▄▄▀ ▀▀▀ ──▀── ▀▀▀ ▀▀▀ ▀▀▀▀ █▀▀▀ ▀▀▀ ▀─▀▀
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____________________________________________________________________________________________________________________________________________
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▄▀█ █▀ █▀ █▀▀ ▀█▀ ▀ █░█ █░░ ▀█▀ █ █▀▄▀█ ▄▀█ ▀█▀ █▀▀ ▄█ █▀█ ▄█▄ █▀ █░█ ▄▀█ █▀▄ █▀▀ █▀█ █▀
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█▀█ ▄█ ▄█ ██▄ ░█░ ▄ █▄█ █▄▄ ░█░ █ █░▀░█ █▀█ ░█░ ██▄ ░█ █▄█ ░▀░ ▄█ █▀█ █▀█ █▄▀ ██▄ █▀▄ ▄█
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____________________________________________________________________________________________________________________________________________
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License:
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The license is ATTRIBUTION 3.0
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More license info here:
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https://creativecommons.org/licenses/by/3.0/
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____________________________________________________________________________________________________________________________________________
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This shader has NOT been tested on any other PC configuration except the following:
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CPU: Intel Core i5-6400
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GPU: NVidia GTX 750Ti
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RAM: 16GB
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Windows: 10 x64
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DirectX: 11
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____________________________________________________________________________________________________________________________________________
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*/
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#pragma kernel MoveParticels
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RWStructuredBuffer<float3> positions;
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RWStructuredBuffer<float3> defaultPositions;
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RWStructuredBuffer<float3> velocities;
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float deltaTime;
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float elapsedTime;
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float particleSpeed;
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// really rounded
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#define PI 3.14
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#define PI_M_2 6.28
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#define PI_D_2 1.57
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// Sine from Taylor series
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half ta_sin(half theta) {
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half a = theta + PI_D_2;
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theta = ((a>0) ? a - PI_M_2*((int)(a / PI_M_2)) : (-a + PI_M_2*((int)(a / PI_M_2)))) - PI_D_2;
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if (theta > PI_D_2)
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theta = PI - theta;
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half x3 = theta * theta * theta;
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return theta - (x3 / 6.0) + (x3 * theta * theta) / 120.0;
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}
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half ta_cos(half theta) {
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return ta_sin(90.0 - theta);
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}
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float distSqr(half3 p1, half3 p2)
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{
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return (p1.x - p2.x) * (p1.x - p2.x) + (p1.y - p2.y) * (p1.y - p2.y) + (p1.z - p2.z) * (p1.z - p2.z);
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}
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half3 randomMovement(uint3 id) {
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return
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half3(frac(sin(id.x + ta_sin(id.x + ta_cos(elapsedTime))) * particleSpeed) - .5,
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frac(cos(id.x + ta_sin(id.x + ta_sin(elapsedTime))) * particleSpeed) - .5,
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frac(sin(id.x + ta_sin(id.x) * ta_cos(elapsedTime)) * particleSpeed) - .5
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);
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}
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[numthreads(1,1,1)]
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void MoveParticels(uint3 id : SV_DispatchThreadID)
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{
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// id.x
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velocities[id.x] += randomMovement(id.x) * .1;
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velocities[id.x] += (defaultPositions[id.x] - positions[id.x]) * distSqr(positions[id.x], defaultPositions[id.x]) * .1;
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velocities[id.x] = normalize(velocities[id.x]);
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positions[id.x] += velocities[id.x] * particleSpeed * deltaTime;
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} |