136 lines
4.4 KiB
C#
136 lines
4.4 KiB
C#
//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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// file="Random.cs"
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// Project: StgSharp
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// AuthorGroup: Nitload Space
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// Copyright (c) Nitload Space. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the “Software”), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and
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// this permission notice shall be included in all copies
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// or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED “AS IS”,
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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using StgSharp.Math.HighPrecession;
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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Security.Cryptography;
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using System.Text;
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namespace StgSharp.Math
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{
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public static unsafe partial class Scaler
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{
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private static byte[] randomSeed;
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/// <summary>
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/// returns a random float number between 0 and 1.
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/// </summary>
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/// <returns></returns>
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public static unsafe float LowProceisionRandom()
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{
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float seed = currentSeed;
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float sample = Scaler.Pow(Scaler.SeedSqrt(seed), 2);
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float sample2 = (sample - seed) / seed;
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sample2 = Scaler.Abs(sample2);
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if (sample == 1)
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{
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sample = sample2;
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}
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currentSeed = sample;
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sample2 *= 1000000;
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float result = sample2 - ((int)sample2);
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if (result == 0)
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{
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currentSeed = sample2 + 0.1f;
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result = Scaler.LowProceisionRandom();
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}
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return result;
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}
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/// <summary>
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///
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/// </summary>
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/// <returns></returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static T Random<T>() where T : struct, IConvertible
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#if NET8_0_OR_GREATER
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,INumber
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#endif
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{
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if (randomSeed == null)
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{
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randomSeed = new byte[64];
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string originSeed =
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($"{((Assembly.GetEntryAssembly() == null) ? (Assembly.GetAssembly(typeof(StgSharp))!) :
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Assembly.GetEntryAssembly())}") +
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($"{DateTime.UtcNow.ToString("o")}");
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using (SHA256 sha = SHA256.Create())
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{
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randomSeed = sha.ComputeHash(Encoding.UTF8.GetBytes(originSeed));
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}
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}
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using (SHA256 sha = SHA256.Create())
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{
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randomSeed = sha.ComputeHash(randomSeed);
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}
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fixed (byte* bptr = randomSeed)
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{
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return *(T*)bptr;
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}
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}
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/// <summary>
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/// Generates a random seed in int value.
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/// </summary>
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/// <returns></returns>
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public static unsafe int RandomSeed()
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{
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float seedValue1 = LowProceisionRandom();
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float seedValue2 = LowProceisionRandom();
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uint seedValueBits = *(uint*)&seedValue1;
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float seedValue = seedValueBits * seedValue2;
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return *(int*)&seedValue;
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}
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internal static float currentSeed
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#if DEBUG
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= 0.5f;
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#else
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= Abs(System.DateTime.UtcNow.GetHashCode());
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#endif
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}
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}
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