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SQCSim2021/perlin.h

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+//http://www.flipcode.com/archives/Perlin_Noise_Class.shtml
+#ifndef PERLIN_H_
+
+#define PERLIN_H_
+
+#include <stdlib.h>
+
+
+#define SAMPLE_SIZE 1024
+
+class Perlin
+{
+public:
+
+  Perlin(int octaves,float freq,float amp,int seed);
+
+
+  float Get(float x,float y)
+  {
+    float vec[2];
+    vec[0] = x;
+    vec[1] = y;
+    return perlin_noise_2D(vec);
+  };
+
+  float Get(float x,float y, float z)
+  {
+    float vec[3];
+    vec[0] = x;
+    vec[1] = y;
+    vec[2] = z;
+    return perlin_noise_3D(vec);
+  };
+
+private:
+  void init_perlin(int n,float p);
+  float perlin_noise_2D(float vec[2]);
+  float perlin_noise_3D(float vec[3]);
+
+  float noise1(float arg);
+  float noise2(float vec[2]);
+  float noise3(float vec[3]);
+  void normalize2(float v[2]);
+  void normalize3(float v[3]);
+  void init(void);
+
+  int   mOctaves;
+  float mFrequency;
+  float mAmplitude;
+  int   mSeed;
+
+  int p[SAMPLE_SIZE + SAMPLE_SIZE + 2];
+  float g3[SAMPLE_SIZE + SAMPLE_SIZE + 2][3];
+  float g2[SAMPLE_SIZE + SAMPLE_SIZE + 2][2];
+  float g1[SAMPLE_SIZE + SAMPLE_SIZE + 2];
+  bool  mStart;
+
+};
+
+#endif