28 lines
648 B
C#
28 lines
648 B
C#
using Unity.Mathematics;
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using static Unity.Mathematics.math;
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public static class Noise1D
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{
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private const float HASHSCALE = 0.1031f;
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static float hash(float p)
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{
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float3 p3 = frac(float3(p) * HASHSCALE);
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p3 += dot(p3, p3.yzx + 19.19f);
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return frac((p3.x + p3.y) * p3.z);
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}
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static float fade(float t) { return t * t * t * (t * (6f* t - 15f) + 10f); }
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static float grad(float hash, float p)
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{
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int i = (int)(1e4 * hash);
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return (i & 1) == 0 ? p : -p;
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}
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public static float noise(float p)
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{
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float pi = floor(p), pf = p - pi, w = fade(pf);
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return lerp(grad(hash(pi), pf), grad(hash(pi + 1.0f), pf - 1.0f), w) * 2.0f;
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}
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}
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