#ifndef CG1_TRACER_PERLINNOISE_H
#define CG1_TRACER_PERLINNOISE_H


#include "noise.h"

// Stolen from https://en.wikipedia.org/wiki/Perlin_noise
class PerlinNoise : public Noise
{
public:
    /**
     *
     * @param size
     * @param gridSize
     * @param seed 0 for random seed
     */
    PerlinNoise(int size, int gridSize, unsigned int seed = 0);

    void renderNoiseThread(int xOffset, int xSize);
private:
    void generateNoise();
    std::normal_distribution<float> distribution;
    std::mt19937 generator;

    int gridSize;
    std::vector<Vector3d> gradients;

    Vector3d randomGradient();

    float getGradientValue(int x, int y, int z);

    float getCornerValue(Vector3d position, Vector3d corner);

    static void runPerlinNoiseInThread(int xOffset, int xSize, PerlinNoise *noise);

};


#endif //CG1_TRACER_PERLINNOISE_H