Fix rng algorithm. (#55)

* Fix rng algorithm.

* 更新 Perlin 实现

Author: Alinshans

src/MineCase.Algorithm/Noise/PerlinNoise.cs

@@ -13,17 +13,17 @@ public class PerlinNoise : INoise
         /// <summary>
         /// Permutation
         /// </summary>
-        private readonly int[] _p = new int[512];
+        private readonly byte[] _p = new byte[512];
 
         /// <summary>
         /// Initializes a new instance of the <see cref="PerlinNoise"/> class.
         /// </summary>
         /// <param name="seed">Seed for generating permutaion.</param>
         public PerlinNoise(int seed)
         {
-            var random = new Random(seed);
+            var random = new UniformRNG((ulong)seed);
             for (int i = 0; i < 256; i++)
-                _p[i + 256] = _p[i] = random.Next(0, 256);
+                _p[i + 256] = _p[i] = (byte)(random.NextUInt32() % 256);
         }
 
         public float Noise(float x, float y, float z)

src/MineCase.Algorithm/UniformRNG.cs

@@ -97,6 +97,9 @@ public double Uniform(double a, double b)
 
         private uint Next()
         {
+            _state ^= _state >> 13;
+            _state ^= (_state << 7) | 0x9d2c5680;
+            _state ^= (_state << 15) & 0xefc67a5b;
             _state = _state * _multiplier + _increment;
             return (uint)_state;
         }