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noise rng maths

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This commit is contained in:
ethan merchant 2024-12-19 04:08:11 -05:00
parent de8a2dbe09
commit 2541a6d96c
2 changed files with 122 additions and 3 deletions
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121
src/Maths.cs
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@ -35,7 +35,10 @@ public static class Maths
// public static int roundi(float value) => MathF.Round(value)
public static float precision(float x, float p)
=> round(x * p) / p;
{
float ps = p < 1.0f ? 1 / p : p;
return round(x * ps) / ps;
}
public static float smooth_start(float t) => (t * t * t);
public static float smooth_stop(float t)
@ -94,6 +97,122 @@ public static class Maths
}
}
/// <summary>
/// SquirrelNoise5 - Squirrel's Raw Noise utilities (version 5)
/// Converted to C# from original C++ implementation by Squirrel Eiserloh
/// </summary>
public static class Noise
{
// Bit noise constants
private const uint SQ5_BIT_NOISE1 = 0xd2a80a3f;
private const uint SQ5_BIT_NOISE2 = 0xa884f197;
private const uint SQ5_BIT_NOISE3 = 0x6C736F4B;
private const uint SQ5_BIT_NOISE4 = 0xB79F3ABB;
private const uint SQ5_BIT_NOISE5 = 0x1b56c4f5;
// Constants for higher dimensional noise
private const int PRIME1 = 198491317;
private const int PRIME2 = 6542989;
private const int PRIME3 = 357239;
/// <summary>
/// Fast hash of an int32 into a different (unrecognizable) uint32
/// </summary>
private static uint GetNoise(int positionX, uint seed)
{