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NetRandom updated; four implementations provided: Multiply with carry, XorShift, Mersenne Twister and RNGCryptoServiceProvider based

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lidgren
2014-08-07 22:53:24 +00:00
parent fd3893afcb
commit 5f5cd5ecf6
9 changed files with 363 additions and 144 deletions
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42
Lidgren.Network/NetRandomSeed.cs Normal file
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using System;
using System.Threading;
namespace Lidgren.Network
{
public static class NetRandomSeed
{
private static int m_seedIncrement = -1640531527;
/// <summary>
/// Generates a 32 bit random seed
/// </summary>
public static uint GetUInt32()
{
ulong seed = GetUInt64();
uint low = (uint)seed;
uint high = (uint)(seed >> 32);
return low ^ high;
}
/// <summary>
/// Generates a 64 bit random seed
/// </summary>
public static ulong GetUInt64()
{
#if !__ANDROID__ && !IOS && !UNITY_WEBPLAYER
ulong seed = (ulong)System.Diagnostics.Stopwatch.GetTimestamp();
seed ^= (ulong)Environment.WorkingSet;
ulong s2 = (ulong)Interlocked.Increment(ref m_seedIncrement);
s2 |= (((ulong)Guid.NewGuid().GetHashCode()) << 32);
seed ^= s2;
#else
ulong v1 = (ulong)Environment.TickCount;
v1 |= (((ulong)(new object().GetHashCode())) << 32);
ulong v2 = (ulong)Guid.NewGuid().GetHashCode();
v2 |= (((ulong)(Interlocked.Increment(ref m_seedIncrement)) << 32);
return v1 ^ v2;
#endif
return seed;
}
}
}