51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
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/**
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Open Simple Noise for C++
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Port to C++ from https://gist.github.com/KdotJPG/b1270127455a94ac5d19
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by Rickard Lundberg, 2019.
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*/
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#ifndef _OPENSIMPLEX_H__
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#define _OPENSIMPLEX_H__
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#include <cstdint>
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#include <array>
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namespace OpenSimplexNoise
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{
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class Noise
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{
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public:
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Noise();
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Noise(int64_t seed);
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//2D Open Simplex Noise.
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double eval(const double x, const double y) const;
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//3D Open Simplex Noise.
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double eval(double x, double y, double z) const;
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//4D Open Simplex Noise.
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double eval(double x, double y, double z, double w) const;
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private:
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const double m_stretch2d;
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const double m_squish2d;
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const double m_stretch3d;
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const double m_squish3d;
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const double m_stretch4d;
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const double m_squish4d;
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const double m_norm2d;
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const double m_norm3d;
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const double m_norm4d;
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const long m_defaultSeed;
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std::array<short, 256> m_perm;
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std::array<short, 256> m_permGradIndex3d;
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std::array<char, 16> m_gradients2d;
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std::array<char, 72> m_gradients3d;
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std::array<char, 256> m_gradients4d;
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double extrapolate(int xsb, int ysb, double dx, double dy) const;
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double extrapolate(int xsb, int ysb, int zsb, double dx, double dy, double dz) const;
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double extrapolate(int xsb, int ysb, int zsb, int wsb, double dx, double dy, double dz, double dw) const;
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};
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}
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#endif // _OPENSIMPLEX_H__
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