| | | 1 | | namespace Rudim.Common |
| | | 2 | | { |
| | | 3 | | /* |
| | | 4 | | * This class is to generate fast random numbers using |
| | | 5 | | * https://en.wikipedia.org/wiki/Xorshift |
| | | 6 | | */ |
| | | 7 | | public static class Random |
| | | 8 | | { |
| | | 9 | | // Arbitrary starting seed |
| | 1 | 10 | | private static ulong _ulongState = 1804289383; |
| | 1 | 11 | | private static int _intState = 1804289383; |
| | | 12 | | |
| | | 13 | | public static ulong NextULong() |
| | | 14 | | { |
| | 1338 | 15 | | ulong randomNumber = _ulongState; |
| | 1338 | 16 | | randomNumber ^= randomNumber << 13; |
| | 1338 | 17 | | randomNumber ^= randomNumber >> 7; |
| | 1338 | 18 | | randomNumber ^= randomNumber << 17; |
| | 1338 | 19 | | return _ulongState = randomNumber; |
| | | 20 | | } |
| | | 21 | | |
| | | 22 | | public static int NextInt() |
| | | 23 | | { |
| | 500 | 24 | | int randomNumber = _intState; |
| | 500 | 25 | | randomNumber ^= randomNumber << 13; |
| | 500 | 26 | | randomNumber ^= randomNumber >> 17; |
| | 500 | 27 | | randomNumber ^= randomNumber << 5; |
| | 500 | 28 | | return _intState = randomNumber; |
| | | 29 | | } |
| | | 30 | | |
| | | 31 | | // DO NOT USE FOR PROJECT - ONLY USED IN RandomTest.cs for determinism |
| | | 32 | | public static void _RESET_SEED() |
| | | 33 | | { |
| | 2 | 34 | | _ulongState = 1804289383; |
| | 2 | 35 | | _intState = 1804289383; |
| | 2 | 36 | | } |
| | | 37 | | } |
| | | 38 | | } |