FastNoiseCompute

This is a library a port of FastNoise by Auburns implemented in Unity Compute shaders. I'm slowly adding the different noise types.

This should also support other compute shader platforms, as long as they use HLSL.

All functions have been verified to be the same (at least, my mesh generator produced the same results using this and FastNoise C#).

Feel free to read my blog post explaining my motivations to create this (and how this can help you too!).

API Reference

I will redo this one day, but for now this will be the documentation for this project (hopefully this suffices).

Types

• FN_DECIMAL - resolves to either float or double (depending on config).
• FN_DECIMAL2 - resolves to either float2 or double2 (depending on config).
• FN_DECIMAL3 - resolves to either float3 or double3 (depending on config).
• FN_DECIMAL4 - resolves to either float4 or double4 (depending on config).

Noise types

• FN_NOISE_VALUE
• FN_NOISE_VALUE_FRACTAL
• FN_NOISE_PERLIN
• FN_NOISE_PERLIN_FRACTAL
• FN_NOISE_SIMPLEX
• FN_NOISE_SIMPLEX_FRACTAL
• FN_NOISE_CELLULAR - Not implemented yet
• FN_NOISE_WHITENOISE
• FN_NOISE_CUBIC
• FN_NOISE_CUBIC_FRACTAL

Fractal Types

• FN_FRACTAL_FBM
• FN_FRACTAL_BILLOW
• FN_FRACTAL_RIGIDMULTI

Interpolation Methods

• FN_INTERP_LINEAR
• FN_INTERP_HERMITE
• FN_INTERP_QUINTIC

Configuration Functions

• void FNInit() - You must call this at the start of your shader if you do not use FNSetSeed
• void FNSetNoiseType(int type) - Set the type of noise returned by GetNoise (default: FN_NOISE_SIMPLEX)
• void FNSetSeed(int seed) - Set the seed used by all noise functions (default: 1337). Must be called before any get seed functions if you are using this.
• int FNGetSeed() - Get the seed used by all noise functions
• void FNSetInterp(int interp) - Set the interpolation method (default: FN_INTERP_QUINTIC).
• void FNSetFrequency(FN_DECIMAL frequency) - Set the noise frequency (default: 0.001).
• void FNSetFractalOctaves(int octaves) - Set the number of fractal octaves (default: 3)
• void FNSetFractalLacunarity(FN_DECIMAL lacunarity) - Set the fractal lacunarity (default: 2.0).
• void FNSetFractalGain(FN_DECIMAL gain) - Set the fractal gain (default: 0.5).
• void FNSetFractalType(int type) - Set the fractal type (default: FN_FRACTAL_FBM).

General noise functions

• FN_DECIMAL FNGetNoise(FN_DECIMAL x, FN_DECIMAL y, FN_DECIMAL z) - Gets 3d noise from the currently selected generator (See FNSetNoiseType)
• FN_DECIMAL FNGetNoise(FN_DECIMAL x, FN_DECIMAL y, FN_DECIMAL z) - Gets 2d noise from the currently selected generator (See FNSetNoiseType)

White Noise Functions

• FN_DECIMAL FNGetWhiteNoise(FN_DECIMAL x, FN_DECIMAL y, FN_DECIMAL z, FN_DECIMAL w)
• FN_DECIMAL FNGetWhiteNoise(FN_DECIMAL x, FN_DECIMAL y, FN_DECIMAL z)
• FN_DECIMAL FNGetWhiteNoise(FN_DECIMAL x, FN_DECIMAL y)
• FN_DECIMAL FNGetWhiteNoiseInt(int x, int y, int z, int w)
• FN_DECIMAL FNGetWhiteNoiseInt(int x, int y, int z)
• FN_DECIMAL FNGetWhiteNoiseInt(int x, int y)

Value Noise Functions

• FN_DECIMAL FNGetValue(FN_DECIMAL x, FN_DECIMAL y, FN_DECIMAL z)
• FN_DECIMAL FNGetValue(FN_DECIMAL3 pos)
• FN_DECIMAL FNGetValueFractal(FN_DECIMAL x, FN_DECIMAL y, FN_DECIMAL z) - Uses the current fractal type.
• FN_DECIMAL FNGetValueFractal(FN_DECIMAL3 pos) - Uses the current fractal type.
• FN_DECIMAL FNGetValue(FN_DECIMAL x, FN_DECIMAL y)
• FN_DECIMAL FNGetValue(FN_DECIMAL2 pos)
• FN_DECIMAL FNGetValueFractal(FN_DECIMAL x, FN_DECIMAL y) - Uses the current fractal type.
• FN_DECIMAL FNGetValueFractal(FN_DECIMAL2 pos) - Uses the current fractal type.

Perlin Noise Functions

• FN_DECIMAL FNGetPerlin(FN_DECIMAL x, FN_DECIMAL y, FN_DECIMAL z)
• FN_DECIMAL FNGetPerlin(FN_DECIMAL3 pos)
• FN_DECIMAL FNGetPerlinFractal(FN_DECIMAL x, FN_DECIMAL y, FN_DECIMAL z) - Uses the current fractal type.
• FN_DECIMAL FNGetPerlinFractal(FN_DECIMAL3 pos)
• FN_DECIMAL FNGetPerlin(FN_DECIMAL x, FN_DECIMAL y)
• FN_DECIMAL FNGetPerlin(FN_DECIMAL2 pos)
• FN_DECIMAL FNGetPerlinFractal(FN_DECIMAL x, FN_DECIMAL y) - Uses the current fractal type.
• FN_DECIMAL FNGetPerlinFractal(FN_DECIMAL2 pos) - Uses the current fractal type.

Simplex Noise Functions

• FN_DECIMAL FNGetSimplex(FN_DECIMAL x, FN_DECIMAL y, FN_DECIMAL z)
• FN_DECIMAL FNGetSimplex(FN_DECIMAL3 pos)
• FN_DECIMAL FNGetSimplexFractal(FN_DECIMAL x, FN_DECIMAL y, FN_DECIMAL z) - Uses the current fractal type.
• FN_DECIMAL FNGetSimplexFractal(FN_DECIMAL3 pos) - Uses the current fractal type.
• FN_DECIMAL FNGetSimplex(FN_DECIMAL x, FN_DECIMAL y)
• FN_DECIMAL FNGetSimplex(FN_DECIMAL2 pos)
• FN_DECIMAL FNGetSimplexFractal(FN_DECIMAL x, FN_DECIMAL y) - Uses the current fractal type.
• FN_DECIMAL FNGetSimplexFractal(FN_DECIMAL2 pos) - Uses the current fractal type.

Cubic Noise Functions

• FN_DECIMAL FNGetCubic(FN_DECIMAL x, FN_DECIMAL y, FN_DECIMAL z)
• FN_DECIMAL FNGetCubic(FN_DECIMAL3 pos)
• FN_DECIMAL FNGetCubicFractal(FN_DECIMAL x, FN_DECIMAL y, FN_DECIMAL z) - Uses the current fractal type.
• FN_DECIMAL FNGetCubicFractal(FN_DECIMAL3 pos) - Uses the current fractal type.
• FN_DECIMAL FNGetCubic(FN_DECIMAL x, FN_DECIMAL y)
• FN_DECIMAL FNGetCubic(FN_DECIMAL2 pos)
• FN_DECIMAL FNGetCubicFractal(FN_DECIMAL x, FN_DECIMAL y) - Uses the current fractal type.
• FN_DECIMAL FNGetCubicFractal(FN_DECIMAL2 pos) - Uses the current fractal type.