Terraria 1.4.0.5 Source Code

Utilities/FastRandom.cs

@@ -0,0 +1,68 @@
+// Decompiled with JetBrains decompiler
+// Type: Terraria.Utilities.FastRandom
+// Assembly: Terraria, Version=1.4.0.5, Culture=neutral, PublicKeyToken=null
+// MVID: 67F9E73E-0A81-4937-A22C-5515CD405A83
+// Assembly location: C:\Users\mikeyisbaeyt\Downloads\depotdownloader-2.4.5\depots\105601\6707058\Terraria.exe
+
+using System;
+
+namespace Terraria.Utilities
+{
+  public struct FastRandom
+  {
+    private const ulong RANDOM_MULTIPLIER = 25214903917;
+    private const ulong RANDOM_ADD = 11;
+    private const ulong RANDOM_MASK = 281474976710655;
+
+    public ulong Seed { get; private set; }
+
+    public FastRandom(ulong seed)
+      : this()
+    {
+      this.Seed = seed;
+    }
+
+    public FastRandom(int seed)
+      : this()
+    {
+      this.Seed = (ulong) seed;
+    }
+
+    public FastRandom WithModifier(ulong modifier) => new FastRandom(FastRandom.NextSeed(modifier) ^ this.Seed);
+
+    public FastRandom WithModifier(int x, int y) => this.WithModifier((ulong) ((long) x + 2654435769L + ((long) y << 6)) + ((ulong) y >> 2));
+
+    public static FastRandom CreateWithRandomSeed() => new FastRandom((ulong) Guid.NewGuid().GetHashCode());
+
+    public void NextSeed() => this.Seed = FastRandom.NextSeed(this.Seed);
+
+    private int NextBits(int bits)
+    {
+      this.Seed = FastRandom.NextSeed(this.Seed);
+      return (int) (this.Seed >> 48 - bits);
+    }
+
+    public float NextFloat() => (float) this.NextBits(24) * 5.960464E-08f;
+
+    public double NextDouble() => (double) this.NextBits(32) * 4.65661287307739E-10;
+
+    public int Next(int max)
+    {
+      if ((max & -max) == max)
+        return (int) ((long) max * (long) this.NextBits(31) >> 31);
+      int num1;
+      int num2;
+      do
+      {
+        num1 = this.NextBits(31);
+        num2 = num1 % max;
+      }
+      while (num1 - num2 + (max - 1) < 0);
+      return num2;
+    }
+
+    public int Next(int min, int max) => this.Next(max - min) + min;
+
+    private static ulong NextSeed(ulong seed) => (ulong) ((long) seed * 25214903917L + 11L & 281474976710655L);
+  }
+}