fix: Use built-in RNG (#1599)
### Summary .NET 8 supports Xoroshiro 256** off the shelf and added Shuffle. Switching to that implementation. ### Developer Notes * Removed many convenience methods that weren't used.
This commit is contained in:
Kamron Batman
GitHub
parent
1769d47ba5
commit
dba3ec2db5
14 changed files with 159 additions and 699 deletions
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@ -1,190 +0,0 @@
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/*************************************************************************
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* ModernUO *
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* Copyright 2019-2023 - ModernUO Development Team *
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* Email: hi@modernuo.com *
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* File: BaseRandomSource.cs *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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*************************************************************************/
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using System;
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using System.Diagnostics;
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using System.Numerics;
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using System.Runtime.CompilerServices;
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namespace Server.Random;
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public abstract class BaseRandomSource : IRandomSource
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{
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private const double INCR_DOUBLE = 1.0 / (1UL << 53);
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private const float INCR_FLOAT = 1f / (1U << 24);
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public abstract ulong NextULong();
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public abstract void NextBytes(Span<byte> buffer);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public int Next()
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{
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ulong rtn;
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do
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{
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rtn = NextULong() >> 33;
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} while (rtn == 0x7fff_ffffUL);
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return (int)rtn;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public int Next(int count)
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{
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Debug.Assert(count != 0, $"{nameof(count)} must not be 0");
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if (count is -1 or 0 or 1)
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{
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return 0;
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}
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var negative = count < 0;
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var max = negative ? -count : count;
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var bits = Log2((uint)max);
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int x;
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do
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{
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x = (int)(NextULong() >> (64 - bits));
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} while (x >= max);
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return negative ? -x : x;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public int Next(int minValue, int count) => minValue + Next(count);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public uint Next(uint count)
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{
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Debug.Assert(count != 0, $"{nameof(count)} must not be 0");
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if (count is 0 or 1)
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{
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return 0;
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}
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var bits = Log2(count);
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uint x;
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do
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{
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x = (uint)(NextULong() >> (64 - bits));
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} while (x >= count);
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return x;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public uint Next(uint minValue, uint count) => minValue + Next(count);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public long Next(long count)
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{
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Debug.Assert(count != 0, $"{nameof(count)} must not be 0");
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if (count is -1 or 0 or 1)
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{
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return 0;
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}
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var negative = count < 0;
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var max = negative ? -count : count;
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var bits = Log2((ulong)max);
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long x;
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do
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{
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x = (long)(NextULong() >> (64 - bits));
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} while (x >= max);
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return negative ? -x : x;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public long Next(long minValue, long count) => minValue + Next(count);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public double NextDouble() => (NextULong() >> 11) * INCR_DOUBLE;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public int NextInt() => (int)(NextULong() >> 33);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public uint NextUInt() => (uint)NextULong();
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public bool NextBool() => (NextULong() & 0x8000000000000000) != 0;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public byte NextByte() => (byte)(NextULong() >> 56);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public float NextFloat() => (NextULong() >> 40) * INCR_FLOAT;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public float NextFloatNonZero() => NextFloat() + INCR_FLOAT;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public double NextDoubleNonZero() => NextDouble() + INCR_DOUBLE;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public double NextDoubleHighRes()
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{
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var exponent = -64;
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ulong significand;
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int shift;
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while ((significand = NextULong()) == 0)
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{
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exponent -= 64;
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if (exponent < -1074)
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{
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return 0;
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}
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}
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shift = BitOperations.LeadingZeroCount(significand);
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if (shift != 0)
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{
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exponent -= shift;
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significand <<= shift;
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significand |= NextULong() >> (64 - shift);
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}
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significand |= 1;
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return significand * Math.Pow(2, exponent);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static int Log2(uint v)
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{
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var exp = BitOperations.Log2(v);
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return v == 1 << exp ? exp : exp + 1;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static int Log2(ulong v)
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{
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var exp = BitOperations.Log2(v);
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return v == 1UL << exp ? exp : exp + 1;
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}
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}
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47
Projects/Server/Random/BuiltInRng.cs
Normal file
47
Projects/Server/Random/BuiltInRng.cs
Normal file
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@ -0,0 +1,47 @@
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/*************************************************************************
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* ModernUO *
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* Copyright 2019-2023 - ModernUO Development Team *
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* Email: hi@modernuo.com *
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* File: BuiltInRng.cs *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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*************************************************************************/
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using System;
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using System.Runtime.CompilerServices;
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namespace Server.Random;
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public static class BuiltInRng
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{
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public static System.Random Generator { get; private set; } = new();
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public static void Reset() => Generator = new System.Random();
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int Next() => Generator.Next();
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int Next(int maxValue) => Generator.Next(maxValue);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int Next(int minValue, int count) => minValue + Generator.Next(count);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static long Next(long maxValue) => Generator.NextInt64(maxValue);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static long Next(long minValue, long count) => minValue + Generator.NextInt64(count);
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static double NextDouble() => Generator.NextDouble();
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static void NextBytes(Span<byte> buffer) => Generator.NextBytes(buffer);
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}
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@ -14,27 +14,15 @@
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*************************************************************************/
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using System;
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using System.Buffers.Binary;
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using System.Runtime.CompilerServices;
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using System.Security.Cryptography;
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using Server.Random;
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namespace Server;
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public class SecureRandom : BaseRandomSource
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public static class BuiltInSecureRng
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{
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private RandomNumberGenerator m_Random;
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public RandomNumberGenerator Generator => m_Random ??= RandomNumberGenerator.Create();
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public static RandomNumberGenerator Generator { get; } = RandomNumberGenerator.Create();
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public override ulong NextULong()
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{
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Span<byte> buffer = stackalloc byte[sizeof(ulong)];
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NextBytes(buffer);
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return BinaryPrimitives.ReadUInt64BigEndian(buffer);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public override void NextBytes(Span<byte> buffer) => Generator.GetBytes(buffer);
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public static void NextBytes(Span<byte> buffer) => Generator.GetBytes(buffer);
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}
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/*************************************************************************
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* ModernUO *
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* Copyright 2019-2023 - ModernUO Development Team *
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* Email: hi@modernuo.com *
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* File: IRandomSource.cs *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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*************************************************************************/
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using System;
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namespace Server.Random;
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public interface IRandomSource
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{
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int Next();
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int Next(int maxValue);
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int Next(int minValue, int count);
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uint Next(uint maxValue);
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uint Next(uint minValue, uint count);
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long Next(long maxValue);
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long Next(long minValue, long count);
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double NextDouble();
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void NextBytes(Span<byte> buffer);
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int NextInt();
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uint NextUInt();
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ulong NextULong();
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bool NextBool();
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byte NextByte();
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float NextFloat();
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float NextFloatNonZero();
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double NextDoubleNonZero();
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double NextDoubleHighRes();
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}
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@ -1,29 +0,0 @@
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/*************************************************************************
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* ModernUO *
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* Copyright 2019-2023 - ModernUO Development Team *
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* Email: hi@modernuo.com *
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* File: RandomSources.cs *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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*************************************************************************/
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namespace Server.Random;
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public static class RandomSources
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{
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private static IRandomSource _source;
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private static IRandomSource _secureSource;
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public static IRandomSource Source => _source ??= new Xoshiro256PlusPlus();
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public static IRandomSource SecureSource => _secureSource ??= new SecureRandom();
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public static void SetRng(IRandomSource newSource) => _source = newSource;
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public static void SetSecureRng(IRandomSource newSource) => _secureSource = newSource;
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}
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81
Projects/Server/Random/StableRandom.cs
Normal file
81
Projects/Server/Random/StableRandom.cs
Normal file
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/*************************************************************************
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* ModernUO *
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* Copyright 2019-2023 - ModernUO Development Team *
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* Email: hi@modernuo.com *
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* File: StableRandom.cs *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
|
||||
* the Free Software Foundation, either version 3 of the License, or *
|
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* (at your option) any later version. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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*************************************************************************/
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using System;
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using System.Numerics;
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using System.Runtime.CompilerServices;
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namespace Server.Random;
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public static class StableRandom
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{
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// Returns the first long of a new Rng. Used for stable values given a specific set of inputs.
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public static long First(ulong seed, long maxValue)
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{
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Span<ulong> state = stackalloc ulong[4];
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var x = seed;
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state[0] = NextSplitMix(ref x);
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state[1] = NextSplitMix(ref x);
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state[2] = NextSplitMix(ref x);
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state[3] = NextSplitMix(ref x);
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return (long)NextUInt64(state, (ulong)maxValue);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong NextUInt64(Span<ulong> state, ulong maxValue)
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{
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ulong randomProduct = Math.BigMul(maxValue, NextUInt64(ref state), out ulong lowPart);
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if (lowPart < maxValue)
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{
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ulong remainder = (0ul - maxValue) % maxValue;
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while (lowPart < remainder)
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{
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randomProduct = Math.BigMul(maxValue, NextUInt64(ref state), out lowPart);
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}
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}
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return randomProduct;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong NextUInt64(ref Span<ulong> state)
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{
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ulong result = BitOperations.RotateLeft(state[1] * 5, 7) * 9;
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ulong t = state[1] << 17;
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state[2] ^= state[0];
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state[3] ^= state[1];
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state[1] ^= state[2];
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state[0] ^= state[3];
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state[2] ^= t;
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state[3] = BitOperations.RotateLeft(state[3], 45);
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return result;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static ulong NextSplitMix(ref ulong x)
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{
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var z = x += 0x9e3779b97f4a7c15;
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z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
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z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
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return z ^ (z >> 31);
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}
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}
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@ -1,222 +0,0 @@
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/*************************************************************************
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* ModernUO *
|
||||
* Copyright 2019-2023 - ModernUO Development Team *
|
||||
* Email: hi@modernuo.com *
|
||||
* File: Xoshiro256PlusPlus.cs *
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* *
|
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* This program is free software: you can redistribute it and/or modify *
|
||||
* it under the terms of the GNU General Public License as published by *
|
||||
* the Free Software Foundation, either version 3 of the License, or *
|
||||
* (at your option) any later version. *
|
||||
* *
|
||||
* You should have received a copy of the GNU General Public License *
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
|
||||
*************************************************************************/
|
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|
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using System;
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using System.Buffers.Binary;
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using System.Runtime.CompilerServices;
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namespace Server.Random;
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public class Xoshiro256PlusPlus : BaseRandomSource
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{
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private static readonly ulong[] JUMP =
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{ 0x180ec6d33cfd0aba, 0xd5a61266f0c9392c, 0xa9582618e03fc9aa, 0x39abdc4529b1661c };
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private static readonly ulong[] LONG_JUMP =
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{ 0x76e15d3efefdcbbf, 0xc5004e441c522fb3, 0x77710069854ee241, 0x39109bb02acbe635 };
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private ulong _s0, _s1, _s2, _s3;
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public Xoshiro256PlusPlus()
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{
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Span<byte> states = stackalloc byte[32];
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RandomSources.SecureSource.NextBytes(states);
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_s0 = BinaryPrimitives.ReadUInt64LittleEndian(states[..8]);
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_s1 = BinaryPrimitives.ReadUInt64LittleEndian(states[8..16]);
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_s2 = BinaryPrimitives.ReadUInt64LittleEndian(states[16..24]);
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_s3 = BinaryPrimitives.ReadUInt64LittleEndian(states[24..32]);
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}
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public Xoshiro256PlusPlus(ulong seed)
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{
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var mix = new SplitMix64(seed);
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Span<ulong> state = stackalloc ulong[4];
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mix.FillArray(state);
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_s0 = state[0];
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_s1 = state[1];
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_s2 = state[2];
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_s3 = state[3];
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}
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private Xoshiro256PlusPlus(ulong s0, ulong s1, ulong s2, ulong s3)
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{
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_s0 = s0;
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_s1 = s1;
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_s2 = s2;
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_s3 = s3;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public override ulong NextULong()
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{
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var r1 = (_s1 << 2) + _s1;
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var r2 = (r1 << 7) | (r1 >> 57);
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var rslt = (r2 << 3) + r2;
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var t = _s1 << 17;
|
||||
|
||||
_s2 ^= _s0;
|
||||
_s3 ^= _s1;
|
||||
_s1 ^= _s2;
|
||||
_s0 ^= _s3;
|
||||
|
||||
_s2 ^= t;
|
||||
|
||||
_s3 = (_s3 << 45) | (_s3 >> 19);
|
||||
|
||||
return rslt;
|
||||
}
|
||||
|
||||
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
||||
public override unsafe void NextBytes(Span<byte> b)
|
||||
{
|
||||
if (b.Length == 0)
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
var s0 = _s0;
|
||||
var s1 = _s1;
|
||||
var s2 = _s2;
|
||||
var s3 = _s3;
|
||||
|
||||
var i = 0;
|
||||
|
||||
fixed (byte* pBuffer = b)
|
||||
{
|
||||
var pULong = (ulong*)pBuffer;
|
||||
|
||||
for (var bound = b.Length / sizeof(ulong); i < bound; i++)
|
||||
{
|
||||
var r1 = (s1 << 2) + s1;
|
||||
var r2 = (r1 << 7) | (r1 >> 57);
|
||||
pULong[i] = (r2 << 3) + r2;
|
||||
|
||||
var t = s1 << 17;
|
||||
s2 ^= s0;
|
||||
s3 ^= s1;
|
||||
s1 ^= s2;
|
||||
s0 ^= s3;
|
||||
|
||||
s2 ^= t;
|
||||
|
||||
s3 = (s3 << 45) | (s3 >> 19);
|
||||
}
|
||||
}
|
||||
|
||||
i *= 8;
|
||||
|
||||
if (i < b.Length)
|
||||
{
|
||||
var r1 = (s1 << 2) + s1;
|
||||
var r2 = (r1 << 7) | (r1 >> 57);
|
||||
var rslt = (r2 << 3) + r2;
|
||||
|
||||
var t = s1 << 17;
|
||||
|
||||
s2 ^= s0;
|
||||
s3 ^= s1;
|
||||
s1 ^= s2;
|
||||
s0 ^= s3;
|
||||
|
||||
s2 ^= t;
|
||||
|
||||
s3 = (s3 << 45) | (s3 >> 19);
|
||||
|
||||
while (i < b.Length)
|
||||
{
|
||||
b[i++] = (byte)rslt;
|
||||
rslt >>= 8;
|
||||
}
|
||||
}
|
||||
|
||||
_s0 = s0;
|
||||
_s1 = s1;
|
||||
_s2 = s2;
|
||||
_s3 = s3;
|
||||
}
|
||||
|
||||
public void Jump() => Jump(JUMP);
|
||||
|
||||
public void LongJump() => Jump(LONG_JUMP);
|
||||
|
||||
private void Jump(in ulong[] jumps)
|
||||
{
|
||||
ulong s0 = 0;
|
||||
ulong s1 = 0;
|
||||
ulong s2 = 0;
|
||||
ulong s3 = 0;
|
||||
|
||||
for (var i = 0; i < jumps.Length; i++)
|
||||
{
|
||||
for (var b = 0; b < 64; b++)
|
||||
{
|
||||
if ((jumps[i] & (1ul << b)) != 0)
|
||||
{
|
||||
s0 ^= _s0;
|
||||
s1 ^= _s1;
|
||||
s2 ^= _s2;
|
||||
s3 ^= _s3;
|
||||
}
|
||||
|
||||
NextULong();
|
||||
}
|
||||
}
|
||||
|
||||
_s0 = s0;
|
||||
_s1 = s1;
|
||||
_s2 = s2;
|
||||
_s3 = s3;
|
||||
}
|
||||
|
||||
public Xoshiro256PlusPlus Split()
|
||||
{
|
||||
var rng = new Xoshiro256PlusPlus(_s0, _s1, _s2, _s3);
|
||||
rng.Jump();
|
||||
return rng;
|
||||
}
|
||||
|
||||
public Xoshiro256PlusPlus LongSplit()
|
||||
{
|
||||
var rng = new Xoshiro256PlusPlus(_s0, _s1, _s2, _s3);
|
||||
rng.LongJump();
|
||||
return rng;
|
||||
}
|
||||
}
|
||||
|
||||
public class SplitMix64
|
||||
{
|
||||
private ulong x;
|
||||
|
||||
public SplitMix64(ulong seed) => x = seed;
|
||||
|
||||
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
||||
public ulong Next()
|
||||
{
|
||||
var z = x += 0x9e3779b97f4a7c15;
|
||||
z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
|
||||
z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
|
||||
return z ^ (z >> 31);
|
||||
}
|
||||
|
||||
[MethodImpl(MethodImplOptions.AggressiveInlining)]
|
||||
public void FillArray(Span<ulong> arr)
|
||||
{
|
||||
for (var i = 0; i < arr.Length; i++)
|
||||
{
|
||||
arr[i] = Next();
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue