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Author: Grunnt (posted 2014-09-23 14:38:19, viewed 601 times)

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package nl.grunnt.lib.math;

/**
 * Modified version of the SimplexNoise code placed in the public domain by Stefan Gustavson, Linköping University,
 * Sweden
 */
public class SimplexNoiseGenerator {

   private static final FastRandom random = new FastRandom();

   private static int grad3[][] = { { 1, 1, 0 }, { -1, 1, 0 }, { 1, -1, 0 }, { -1, -1, 0 }, { 1, 0, 1 }, { -1, 0, 1 },
         { 1, 0, -1 }, { -1, 0, -1 }, { 0, 1, 1 }, { 0, -1, 1 }, { 0, 1, -1 }, { 0, -1, -1 } };

   private static int p[] = { 151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225, 140, 36, 103, 30,
         69, 142, 8, 99, 37, 240, 21, 10, 23, 190, 6, 148, 247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203,
         117, 35, 11, 32, 57, 177, 33, 88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175, 74, 165, 71, 134,
         139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122, 60, 211, 133, 230, 220, 105, 92, 41, 55, 46, 245,
         40, 244, 102, 143, 54, 65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89, 18, 169, 200, 196, 135,
         130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64, 52, 217, 226, 250, 124, 123, 5, 202, 38, 147,
         118, 126, 255, 82, 85, 212, 207, 206, 59, 227, 47, 16, 58, 17, 182, 189, 28, 42, 223, 183, 170, 213, 119,
         248, 152, 2, 44, 154, 163, 70, 221, 153, 101, 155, 167, 43, 172, 9, 129, 22, 39, 253, 19, 98, 108, 110, 79,
         113, 224, 232, 178, 185, 112, 104, 218, 246, 97, 228, 251, 34, 242, 193, 238, 210, 144, 12, 191, 179, 162,
         241, 81, 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31, 181, 199, 106, 157, 184, 84, 204, 176, 115,
         121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93, 222, 114, 67, 29, 24, 72, 243, 141, 128, 195, 78, 66,
         215, 61, 156, 180 };

   // To remove the need for index wrapping, double the permutation table length
   private static int perm[] = new int[512];
   static {
      for (int i = 0; i < 512; i++)
         perm[i] = p[i & 255];
   }

   // This method is a *lot* faster than using (int)Math.floor(x)
   private static int fastfloor(double x) {
      return x > 0 ? (int) x : (int) x - 1;
   }

   private static double dot(int g[], double x, double y) {
      return g[0] * x + g[1] * y;
   }

   // 2D simplex noise
   public static double noise(double xin, double yin) {
      double n0, n1, n2;

      final double F2 = 0.5 * (Math.sqrt(3.0) - 1.0);
      double s = (xin + yin) * F2;
      int i = fastfloor(xin + s);
      int j = fastfloor(yin + s);

      final double G2 = (3.0 - Math.sqrt(3.0)) / 6.0;
      double t = (i + j) * G2;
      double X0 = i - t;
      double Y0 = j - t;
      double x0 = xin - X0;
      double y0 = yin - Y0;

      int i1, j1;
      if (x0 > y0) {
         i1 = 1;
         j1 = 0;
      } else {
         i1 = 0;
         j1 = 1;
      }

      double x1 = x0 - i1 + G2;
      double y1 = y0 - j1 + G2;
      double x2 = x0 - 1.0 + 2.0 * G2;
      double y2 = y0 - 1.0 + 2.0 * G2;

      int ii = i & 255;
      int jj = j & 255;
      int gi0 = perm[ii + perm[jj]] % 12;
      int gi1 = perm[ii + i1 + perm[jj + j1]] % 12;
      int gi2 = perm[ii + 1 + perm[jj + 1]] % 12;

      double t0 = 0.5 - x0 * x0 - y0 * y0;
      if (t0 < 0)
         n0 = 0.0;
      else {
         t0 *= t0;
         n0 = t0 * t0 * dot(grad3[gi0], x0, y0);
      }

      double t1 = 0.5 - x1 * x1 - y1 * y1;
      if (t1 < 0)
         n1 = 0.0;
      else {
         t1 *= t1;
         n1 = t1 * t1 * dot(grad3[gi1], x1, y1);
      }

      double t2 = 0.5 - x2 * x2 - y2 * y2;
      if (t2 < 0)
         n2 = 0.0;
      else {
         t2 *= t2;
         n2 = t2 * t2 * dot(grad3[gi2], x2, y2);
      }

      return 70.0 * (n0 + n1 + n2);
   }

   public static void genGrad(long seed) {
      for (int i = 0; i < 255; i++)
         p[i] = i;
      for (int i = 0; i < 255; i++) {
         int j = random.nextInt(255);
         int nSwap = p[i];
         p[i] = p[j];
         p[j] = nSwap;
      }

      for (int i = 0; i < 512; i++)
         perm[i] = p[i & 255];
   }
}





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