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SQCSim-common/opensimplex.h

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