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