63 lines
2.8 KiB
C
63 lines
2.8 KiB
C
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#pragma once
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// Taken from: https://github.com/nothings/stb/blob/master/stb_perlin.h
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//
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// stb_perlin.h - v0.3 - perlin noise
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// public domain single-file C implementation by Sean Barrett
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//
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// LICENSE
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//
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// See cpp file.
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//
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// Contributors:
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// Jack Mott - additional noise functions
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//
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// float PerlinNoise3(float x,
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// float y,
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// float z,
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// int x_wrap = 0,
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// int y_wrap = 0,
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// int z_wrap = 0)
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//
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// This function computes a random value at the coordinate (x,y,z).
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// Adjacent random values are continuous but the noise fluctuates
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// its randomness with period 1, i.e. takes on wholly unrelated values
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// at integer points. Specifically, this implements Ken Perlin's
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// revised noise function from 2002.
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//
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// The "wrap" parameters can be used to create wraparound noise that
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// wraps at powers of two. The numbers MUST be powers of two. Specify
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// 0 to mean "don't care". (The noise always wraps every 256 due
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// details of the implementation, even if you ask for larger or no
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// wrapping.)
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//
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// Fractal Noise:
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//
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// Three common fractal noise functions are included, which produce
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// a wide variety of nice effects depending on the parameters
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// provided. Note that each function will call PerlinNoise3
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// 'octaves' times, so this parameter will affect runtime.
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//
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// float PerlinRidgeNoise3(float x, float y, float z,
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// float lacunarity, float gain, float offset, int octaves,
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// int x_wrap, int y_wrap, int z_wrap);
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//
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// float PerlinFBMNoise3(float x, float y, float z,
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// float lacunarity, float gain, int octaves,
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// int x_wrap, int y_wrap, int z_wrap);
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//
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// float PerlinTurbulenceNoise3(float x, float y, float z,
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// float lacunarity, float gain,int octaves,
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// int x_wrap, int y_wrap, int z_wrap);
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//
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// Typical values to start playing with:
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// octaves = 6 -- number of "octaves" of noise3() to sum
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// lacunarity = ~ 2.0 -- spacing between successive octaves (use exactly 2.0 for wrapping output)
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// gain = 0.5 -- relative weighting applied to each successive octave
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// offset = 1.0? -- used to invert the ridges, may need to be larger, not sure
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//
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float PerlinNoise3(float x, float y, float z, int x_wrap, int y_wrap, int z_wrap);
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float PerlinRidgeNoise3(float x, float y, float z, float lacunarity, float gain, float offset, int octaves, int x_wrap, int y_wrap, int z_wrap);
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float PerlinFBMNoise3(float x, float y, float z, float lacunarity, float gain, int octaves,int x_wrap, int y_wrap, int z_wrap);
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float PerlinTurbulenceNoise3(float x, float y, float z, float lacunarity, float gain, int octaves, int x_wrap, int y_wrap, int z_wrap);
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