143 lines
4.8 KiB
C#
143 lines
4.8 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="RandomGenerator.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.Mathematics.Internal;
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using System;
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using System.IO;
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using System.Runtime.CompilerServices;
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using System.Text;
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using System.Xml.Serialization;
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namespace StgSharp.Mathematics.Numeric.Scalar
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{
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public unsafe class RandomGenerator
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{
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private byte[] currentKey;
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private readonly byte[] originKey;
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public RandomGenerator() : this(DateTime.UtcNow.ToBinary()) { }
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public RandomGenerator(object source)
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{
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ArgumentNullException.ThrowIfNull(source);
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XmlSerializer s = new(source.GetType());
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using (StringWriter sw = new())
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{
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s.Serialize(sw, source);
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string data = sw.ToString();
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originKey = Encoding.Unicode.GetBytes(data);
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}
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currentKey = [ 0, 0, 0, 0 ];
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fixed (byte* o = originKey, c = currentKey) {
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*(int*)c = UnsafeCompute.CityHashSimplify((char*)o, 0, originKey.Length / 2);
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}
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TotalGeneratedRandom = 0;
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}
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public int TotalGeneratedRandom
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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get;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private set;
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}
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public unsafe int GenRandomInt()
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{
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uint source = PrivateRand();
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TotalGeneratedRandom++;
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M64 m = new M64();
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m.Member<uint>(0) = source;
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m.Member<uint>(1) = source;
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return (m << (TotalGeneratedRandom % 32)).Member<int>(1);
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}
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public byte GenRandomInt8()
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{
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TotalGeneratedRandom++;
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if (TotalGeneratedRandom % 4 == 0) {
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PrivateRand();
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}
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return currentKey[TotalGeneratedRandom % 4];
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}
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public float GenRandomSingle()
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{
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TotalGeneratedRandom++;
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while (true)
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{
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uint
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temp0 = PrivateRand(),
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temp1 = PrivateRand();
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if (temp0 * temp1 != 0)
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{
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float ret = temp0 % temp1 * 1.0f / temp1;
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if (ret < 0.335f)
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{
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ret = ret * ((ret * (-0.7811934f)) + 1.4489113f);
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} else
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{
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ret = (ret * ((ret * (-0.1158368f)) + 1.0580600f)) + 0.0590584f;
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}
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if (ret > 1)
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{
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continue;
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}
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return ret;
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}
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}
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}
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public void Reset()
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{
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currentKey = originKey;
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TotalGeneratedRandom = 0;
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}
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private unsafe uint PrivateRand()
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{
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uint ret;
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fixed (byte* bptr = currentKey)
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{
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*(int*)bptr = UnsafeCompute.CityHashSimplify((char*)bptr, currentKey.Length / 2);
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ret = *(uint*)bptr;
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}
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// Console.WriteLine(ret.ToString(16));
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return ret;
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}
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}
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}
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