SimplexNoise.h

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#pragma once

#include <cstddef>  // size_t

class SimplexNoise {
public:
        static float simplex1(float x)
        {
                return noise(x*1.2, -x*0.7);
        }
    // 1D Perlin simplex noise
    static float noise(float x);
    // 2D Perlin simplex noise
    static float noise(float x, float y);

    // Fractal/Fractional Brownian Motion (fBm) noise summation
    float fractal(size_t octaves, float x) const;
    float fractal(size_t octaves, float x, float y) const;

    explicit SimplexNoise(float frequency = 1.0f,
                          float amplitude = 1.0f,
                          float lacunarity = 2.0f,
                          float persistence = 0.5f) :
        mFrequency(frequency),
        mAmplitude(amplitude),
        mLacunarity(lacunarity),
        mPersistence(persistence) {
    }

private:
    // Parameters of Fractional Brownian Motion (fBm) : sum of N "octaves" of noise
    float mFrequency;   
    float mAmplitude;   
    float mLacunarity;  
    float mPersistence; 
};