perlinnoise.h

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#pragma once

#include <vector>
#include <random>
#include <map>

#include <QVector2D>

namespace terminus
{

class PerlinNoise
{
protected:
    static const float fScale;
public:
    PerlinNoise();
    PerlinNoise(unsigned int seed);

    void seed(unsigned int seed);
    unsigned int seed() const;

    float noise(int layer, float x, float y) const;

    float symmetricRnd() const;
    float asymmetricRnd() const;

protected:
    float dotGradient(int layer, int iX, int iY, float x, float y) const;

    int gradientIndex(int iX, int iY) const;
    void generateGradients(int layer) const;

    std::vector<QVector2D> & gradients(int layer) const;

protected:
    unsigned int m_seed;
    mutable std::default_random_engine m_rng;
    mutable std::uniform_real_distribution<float> m_distSym;
    mutable std::uniform_real_distribution<float> m_distAsym;

    int m_gradientCount;
    mutable std::map<int,std::vector<QVector2D>> m_gradientGrid;
};

}//namespace terminus