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  1. package net.devtech;
  2.  
  3.  
  4. /**
  5.  * static splittable random
  6.  */
  7. public class Rand {
  8.     private static final long GOLDEN_GAMMA = 0x9e3779b97f4a7c15L;
  9.     private Rand() {/*static class*/}
  10.  
  11.     public static int next(long[] seed) {
  12.         long z = seed[0] += GOLDEN_GAMMA;
  13.         z = (z ^ (z >>> 33)) * 0x62a9d9ed799705f5L;
  14.         return (int) (((z ^ (z >>> 28)) * 0xcb24d0a5c88c35b3L) >>> 32);
  15.     }
  16.  
  17.     public static int next(long seed) {
  18.         long z = seed + GOLDEN_GAMMA;
  19.         z = (z ^ (z >>> 33)) * 0x62a9d9ed799705f5L;
  20.         return (int) (((z ^ (z >>> 28)) * 0xcb24d0a5c88c35b3L) >>> 32);
  21.     }
  22.  
  23.  
  24.     public static long seed(int x, int y) {
  25.         return (long) x << 32 | y & 0xFFFFFFFFL;
  26.     }
  27. }
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