diff --git a/src/FilterStorage.cs b/src/FilterStorage.cs
index aad179b..e4780c5 100644
--- a/src/FilterStorage.cs
+++ b/src/FilterStorage.cs
@@ -59,7 +59,7 @@ namespace MoonTools.ECS
return new RandomEntityEnumerator(
this,
filterSignature,
- RandomGenerator.LinearCongruentialGenerator(FilterCount(filterSignature)));
+ LinearCongruentialGenerator.Generate(FilterCount(filterSignature)));
}
public Entity FilterNthEntity(FilterSignature filterSignature, int index)
@@ -69,7 +69,7 @@ namespace MoonTools.ECS
public Entity FilterRandomEntity(FilterSignature filterSignature)
{
- var randomIndex = RandomGenerator.Next(FilterCount(filterSignature));
+ var randomIndex = LinearCongruentialGenerator.Next(FilterCount(filterSignature));
return new Entity(filterSignatureToEntityIDs[filterSignature][randomIndex]);
}
diff --git a/src/LinearCongruentialGenerator.cs b/src/LinearCongruentialGenerator.cs
new file mode 100644
index 0000000..5190ce0
--- /dev/null
+++ b/src/LinearCongruentialGenerator.cs
@@ -0,0 +1,87 @@
+using System.Runtime.CompilerServices;
+
+namespace MoonTools.ECS
+{
+ public static class LinearCongruentialGenerator
+ {
+ private static Random Random = new Random();
+
+ private static int[] Primes =
+ {
+ 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293,307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397,401,409,419,421,431,433,439,443,449,457,461,463,467,479,487,491,499,503,509,521,523,541,547,557,563,569,571,577,587,593,599,601,607,613,617,619,631,641,643,647,653,659,661,673,677,683,691,701,709,719,727,733,739,743,751,757,761,769,773,787,797,809,811,821,823,827,829,839,853,857,859,863,877,881,883,887,907,911,919,929,937,941,947,953,967,971,977,983,991,997,1009,1013,1019,1021,1031,1033,1039,1049,1051,1061,1063,1069,1087,1091,1093,1097,1103,1109,1117,1123,1129,1151,1153,1163,1171,1181,1187,1193,1201,1213,1217,1223,1229,1231,1237,1249,1259,1277,1279,1283,1289,1291,1297,1301,1303,1307,1319,1321,1327,1361,1367,1373,1381,1399,1409,1423,1427,1429,1433,1439,1447,1451,1453,1459,1471,1481,1483,1487,1489,1493,1499,1511,1523,1531,1543,1549,1553,1559,1567,1571,1579,1583,1597,1601,1607,1609,1613,1619,1621,1627,1637,1657,1663,1667,1669,1693,1697,1699,1709,1721,1723,1733,1741,1747,1753,1759,1777,1783,1787,1789,1801,1811,1823,1831,1847,1861,1867,1871,1873,1877,1879,1889,1901,1907,1913,1931,1933,1949,1951,1973,1979,1987,1993,1997,1999,2003,2011,2017,2027,2029,2039,2053,2063,2069,2081,2083,2087,2089,2099,2111,2113,2129,2131,2137,2141,2143,2153,2161,2179,2203,2207,2213,2221,2237,2239,2243,2251,2267,2269,2273,2281,2287,2293,2297,2309,2311,2333,2339,2341,2347,2351,2357,2371,2377,2381,2383,2389,2393,2399,2411,2417,2423,2437,2441,2447,2459,2467,2473,2477,2503,2521,2531,2539,2543,2549,2551,2557,2579,2591,2593,2609,2617,2621,2633,2647,2657,2659,2663,2671,2677,2683,2687,2689,2693,2699,2707,2711,2713,2719,2729,2731,2741,2749,2753,2767,2777,2789,2791,2797,2801,2803,2819,2833,2837,2843,2851,2857,2861,2879,2887,2897,2903,2909,2917,2927,2939,2953,2957,2963,2969,2971,2999,3001,3011,3019,3023,3037,3041,3049,3061,3067,3079,3083,3089,3109,3119,3121,3137,3163,3167,3169,3181,3187,3191,3203,3209,3217,3221,3229,3251,3253,3257,3259,3271,3299,3301,3307,3313,3319,3323,3329,3331,3343,3347,3359,3361,3371,3373,3389,3391,3407,3413,3433,3449,3457,3461,3463,3467,3469,3491,3499,3511,3517,3527,3529,3533,3539,3541,3547,3557,3559,3571,3581,3583,3593,3607,3613,3617,3623,3631,3637,3643,3659,3671,3673,3677,3691,3697,3701,3709,3719,3727,3733,3739,3761,3767,3769,3779,3793,3797,3803,3821,3823,3833,3847,3851,3853,3863,3877,3881,3889,3907,3911,3917,3919,3923,3929,3931,3943,3947,3967,3989,4001,4003,4007,4013,4019,4021,4027,4049,4051,4057,4073,4079,4091,4093,4099,4111,4127,4129,4133,4139,4153,4157,4159,4177,4201,4211,4217,4219,4229,4231,4241,4243,4253,4259,4261,4271,4273,4283,4289,4297,4327,4337,4339,4349,4357,4363,4373,4391,4397,4409,4421,4423,4441,4447,4451,4457,4463,4481,4483,4493,4507,4513,4517,4519,4523,4547,4549,4561,4567,4583,4591,4597,4603,4621,4637,4639,4643,4649,4651,4657,4663,4673,4679,4691,4703,4721,4723,4729,4733,4751,4759,4783,4787,4789,4793,4799,4801,4813,4817,4831,4861,4871,4877,4889,4903,4909,4919,4931,4933,4937,4943,4951,4957,4967,4969,4973,4987,4993,4999,5003,5009,5011,5021,5023,5039,5051,5059,5077,5081,5087,5099,5101,5107,5113,5119,5147,5153,5167,5171,5179,5189,5197,5209,5227,5231,5233,5237,5261,5273,5279,5281,5297,5303,5309,5323,5333,5347,5351,5381,5387,5393,5399,5407,5413,5417,5419,5431,5437,5441,5443,5449,5471,5477,5479,5483,5501,5503,5507,5519,5521,5527,5531,5557,5563,5569,5573,5581,5591,5623,5639,5641,5647,5651,5653,5657,5659,5669,5683,5689,5693,5701,5711,5717,5737,5741,5743,5749,5779,5783,5791,5801,5807,5813,5821,5827,5839,5843,5849,5851,5857,5861,5867,5869,5879,5881,5897,5903,5923,5927,5939,5953,5981,5987,6007,6011,6029,6037,6043,6047,6053,6067,6073,6079,6089,6091,6101,6113,6121,6131,6133,6143,6151,6163,6173,6197,6199,6203,6211,6217,6221,6229,6247,6257,6263,6269,6271,6277,6287,6299,6301,6311,6317,6323,6329,6337,6343,6353,6359,6361,6367,6373,6379,6389,6397,6421,6427,6449,6451,6469,6473,6481,6491,6521,6529,6547,6551,6553,6563,6569,6571,6577,6581,6599,6607,6619,6637,6653,6659,6661,6673,6679,6689,6691,6701,6703,6709,6719,6733,6737,6761,6763,6779,6781,6791,6793,6803,6823,6827,6829,6833,6841,6857,6863,6869,6871,6883,6899,6907,6911,6917,6947,6949,6959,6961,6967,6971,6977,6983,6991,6997,7001,7013,7019,7027,7039,7043,7057,7069,7079,7103,7109,7121,7127,7129,7151,7159,7177,7187,7193,7207,7211,7213,7219,7229,7237,7243,7247,7253,7283,7297,7307,7309,7321,7331,7333,7349,7351,7369,7393,7411,7417,7433,7451,7457,7459,7477,7481,7487,7489,7499,7507,7517,7523,7529,7537,7541,7547,7549,7559,7561,7573,7577,7583,7589,7591,7603,7607,7621,7639,7643,7649,7669,7673,7681,7687,7691,7699,7703,7717,7723,7727,7741,7753,7757,7759,7789,7793,7817,7823,7829,7841,7853,7867,7873,7877,7879,7883,7901,7907,7919
+ };
+
+ public static uint GetSeed()
+ {
+ return Random.GetSeed();
+ }
+
+ public static void SetRandom(Random random)
+ {
+ Random = random;
+ }
+
+ internal static int Next(int maxValue)
+ {
+ return Random.Next(maxValue);
+ }
+
+ ///
+ /// A psuedorandom nonrepeating sequence of integers from 0 to n.
+ ///
+ internal static LinearCongruentialEnumerator Generate(int n)
+ {
+ if (n == 0)
+ {
+ // bail out, empty enumerator
+ return new LinearCongruentialEnumerator(0, 0, 0);
+ }
+
+ var x = Primes[Random.Next(Primes.Length - 1)];
+ while (x % n == 0)
+ {
+ // not coprime, try again
+ x = Primes[Random.Next(Primes.Length - 1)];
+ }
+
+ return new LinearCongruentialEnumerator(Random.Next(n), x, n);
+ }
+ }
+
+ public struct LinearCongruentialEnumerator
+ {
+ private readonly int start;
+ private readonly int count;
+ private readonly int prime;
+ private int current;
+
+ public LinearCongruentialEnumerator GetEnumerator() => this;
+
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ internal LinearCongruentialEnumerator(int start, int prime, int count)
+ {
+ current = start;
+ this.start = start;
+ this.prime = prime;
+ this.count = count;
+ }
+
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ public bool MoveNext()
+ {
+ current += 1;
+ if (current < start + count)
+ {
+ return true;
+ }
+
+ return false;
+ }
+
+ public int Current
+ {
+ [MethodImpl(MethodImplOptions.AggressiveInlining)]
+ get => (current * prime) % count;
+ }
+ }
+}
diff --git a/src/Random.cs b/src/Random.cs
index acb62bb..0779e46 100644
--- a/src/Random.cs
+++ b/src/Random.cs
@@ -1,77 +1,158 @@
-using System;
+using System;
using System.Runtime.CompilerServices;
namespace MoonTools.ECS
{
- public static class RandomGenerator
+ // WELLRNG512
+ // https://stackoverflow.com/a/1227137
+ public class Random
{
- private static Random random = new Random();
+ public const int STATE_BYTE_COUNT = 68; // 16 state ints + 1 index int
- private static int[] Primes =
- {
- 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293,307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397,401,409,419,421,431,433,439,443,449,457,461,463,467,479,487,491,499,503,509,521,523,541,547,557,563,569,571,577,587,593,599,601,607,613,617,619,631,641,643,647,653,659,661,673,677,683,691,701,709,719,727,733,739,743,751,757,761,769,773,787,797,809,811,821,823,827,829,839,853,857,859,863,877,881,883,887,907,911,919,929,937,941,947,953,967,971,977,983,991,997,1009,1013,1019,1021,1031,1033,1039,1049,1051,1061,1063,1069,1087,1091,1093,1097,1103,1109,1117,1123,1129,1151,1153,1163,1171,1181,1187,1193,1201,1213,1217,1223,1229,1231,1237,1249,1259,1277,1279,1283,1289,1291,1297,1301,1303,1307,1319,1321,1327,1361,1367,1373,1381,1399,1409,1423,1427,1429,1433,1439,1447,1451,1453,1459,1471,1481,1483,1487,1489,1493,1499,1511,1523,1531,1543,1549,1553,1559,1567,1571,1579,1583,1597,1601,1607,1609,1613,1619,1621,1627,1637,1657,1663,1667,1669,1693,1697,1699,1709,1721,1723,1733,1741,1747,1753,1759,1777,1783,1787,1789,1801,1811,1823,1831,1847,1861,1867,1871,1873,1877,1879,1889,1901,1907,1913,1931,1933,1949,1951,1973,1979,1987,1993,1997,1999,2003,2011,2017,2027,2029,2039,2053,2063,2069,2081,2083,2087,2089,2099,2111,2113,2129,2131,2137,2141,2143,2153,2161,2179,2203,2207,2213,2221,2237,2239,2243,2251,2267,2269,2273,2281,2287,2293,2297,2309,2311,2333,2339,2341,2347,2351,2357,2371,2377,2381,2383,2389,2393,2399,2411,2417,2423,2437,2441,2447,2459,2467,2473,2477,2503,2521,2531,2539,2543,2549,2551,2557,2579,2591,2593,2609,2617,2621,2633,2647,2657,2659,2663,2671,2677,2683,2687,2689,2693,2699,2707,2711,2713,2719,2729,2731,2741,2749,2753,2767,2777,2789,2791,2797,2801,2803,2819,2833,2837,2843,2851,2857,2861,2879,2887,2897,2903,2909,2917,2927,2939,2953,2957,2963,2969,2971,2999,3001,3011,3019,3023,3037,3041,3049,3061,3067,3079,3083,3089,3109,3119,3121,3137,3163,3167,3169,3181,3187,3191,3203,3209,3217,3221,3229,3251,3253,3257,3259,3271,3299,3301,3307,3313,3319,3323,3329,3331,3343,3347,3359,3361,3371,3373,3389,3391,3407,3413,3433,3449,3457,3461,3463,3467,3469,3491,3499,3511,3517,3527,3529,3533,3539,3541,3547,3557,3559,3571,3581,3583,3593,3607,3613,3617,3623,3631,3637,3643,3659,3671,3673,3677,3691,3697,3701,3709,3719,3727,3733,3739,3761,3767,3769,3779,3793,3797,3803,3821,3823,3833,3847,3851,3853,3863,3877,3881,3889,3907,3911,3917,3919,3923,3929,3931,3943,3947,3967,3989,4001,4003,4007,4013,4019,4021,4027,4049,4051,4057,4073,4079,4091,4093,4099,4111,4127,4129,4133,4139,4153,4157,4159,4177,4201,4211,4217,4219,4229,4231,4241,4243,4253,4259,4261,4271,4273,4283,4289,4297,4327,4337,4339,4349,4357,4363,4373,4391,4397,4409,4421,4423,4441,4447,4451,4457,4463,4481,4483,4493,4507,4513,4517,4519,4523,4547,4549,4561,4567,4583,4591,4597,4603,4621,4637,4639,4643,4649,4651,4657,4663,4673,4679,4691,4703,4721,4723,4729,4733,4751,4759,4783,4787,4789,4793,4799,4801,4813,4817,4831,4861,4871,4877,4889,4903,4909,4919,4931,4933,4937,4943,4951,4957,4967,4969,4973,4987,4993,4999,5003,5009,5011,5021,5023,5039,5051,5059,5077,5081,5087,5099,5101,5107,5113,5119,5147,5153,5167,5171,5179,5189,5197,5209,5227,5231,5233,5237,5261,5273,5279,5281,5297,5303,5309,5323,5333,5347,5351,5381,5387,5393,5399,5407,5413,5417,5419,5431,5437,5441,5443,5449,5471,5477,5479,5483,5501,5503,5507,5519,5521,5527,5531,5557,5563,5569,5573,5581,5591,5623,5639,5641,5647,5651,5653,5657,5659,5669,5683,5689,5693,5701,5711,5717,5737,5741,5743,5749,5779,5783,5791,5801,5807,5813,5821,5827,5839,5843,5849,5851,5857,5861,5867,5869,5879,5881,5897,5903,5923,5927,5939,5953,5981,5987,6007,6011,6029,6037,6043,6047,6053,6067,6073,6079,6089,6091,6101,6113,6121,6131,6133,6143,6151,6163,6173,6197,6199,6203,6211,6217,6221,6229,6247,6257,6263,6269,6271,6277,6287,6299,6301,6311,6317,6323,6329,6337,6343,6353,6359,6361,6367,6373,6379,6389,6397,6421,6427,6449,6451,6469,6473,6481,6491,6521,6529,6547,6551,6553,6563,6569,6571,6577,6581,6599,6607,6619,6637,6653,6659,6661,6673,6679,6689,6691,6701,6703,6709,6719,6733,6737,6761,6763,6779,6781,6791,6793,6803,6823,6827,6829,6833,6841,6857,6863,6869,6871,6883,6899,6907,6911,6917,6947,6949,6959,6961,6967,6971,6977,6983,6991,6997,7001,7013,7019,7027,7039,7043,7057,7069,7079,7103,7109,7121,7127,7129,7151,7159,7177,7187,7193,7207,7211,7213,7219,7229,7237,7243,7247,7253,7283,7297,7307,7309,7321,7331,7333,7349,7351,7369,7393,7411,7417,7433,7451,7457,7459,7477,7481,7487,7489,7499,7507,7517,7523,7529,7537,7541,7547,7549,7559,7561,7573,7577,7583,7589,7591,7603,7607,7621,7639,7643,7649,7669,7673,7681,7687,7691,7699,7703,7717,7723,7727,7741,7753,7757,7759,7789,7793,7817,7823,7829,7841,7853,7867,7873,7877,7879,7883,7901,7907,7919
- };
+ uint[] State = new uint[16];
+ uint Index = 0;
+ uint Seed;
- public static void SetSeed(int seed)
+ public Random()
{
- random = new Random(seed);
+ Init((uint) Environment.TickCount);
}
- internal static int Next(int maxValue)
+ public void Init(uint seed)
{
- return random.Next(maxValue);
- }
-
- ///
- /// A psuedorandom nonrepeating sequence of integers from 0 to n.
- ///
- internal static LinearCongruentialEnumerator LinearCongruentialGenerator(int n)
- {
- var x = Primes[random.Next(Primes.Length - 1)];
- while (x % n == 0)
+ Seed = seed;
+ uint s = seed;
+ for (int i = 0; i < 16; i++)
{
- // not coprime, try again
- x = Primes[random.Next(Primes.Length - 1)];
+ s = (((s * 214013 + 2531011) >> 16) & 0x7fffffff) | 0;
+ State[i] = ~ ~s; //i ;
}
-
- return new LinearCongruentialEnumerator(random.Next(n), x, n);
- }
- }
-
- public struct LinearCongruentialEnumerator
- {
- private readonly int start;
- private readonly int count;
- private readonly int prime;
- private int current;
-
- public LinearCongruentialEnumerator GetEnumerator() => this;
-
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- internal LinearCongruentialEnumerator(int start, int prime, int count)
- {
- current = start;
- this.start = start;
- this.prime = prime;
- this.count = count;
+ Index = 0;
}
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- public bool MoveNext()
+ public uint GetSeed()
{
- current += 1;
- if (current < start + count)
+ return Seed;
+ }
+
+ public string PrintState()
+ {
+ var s = "";
+ for (var i = 0; i < 16; i += 1)
{
- return true;
+ s += State[i];
}
-
- return false;
+ s += Index;
+ return s;
}
- public int Current
+ // expects a span of 512 bytes
+ public unsafe void SaveState(Span bytes)
{
- [MethodImpl(MethodImplOptions.AggressiveInlining)]
- get => (current * prime) % count;
+ #if DEBUG
+ if (bytes.Length < STATE_BYTE_COUNT)
+ {
+ throw new ArgumentException("Byte span too short!");
+ }
+ #endif
+
+ fixed (byte* ptr = bytes)
+ {
+ var offset = 0;
+ for (var i = 0; i < 16; i += 1)
+ {
+ Unsafe.Write(ptr + offset, State[i]);
+ offset += 4;
+ }
+
+ Unsafe.Write(ptr + offset, Index);
+ }
+ }
+
+ // expects a span of 512 bytes
+ public unsafe void LoadState(Span bytes)
+ {
+ #if DEBUG
+ if (bytes.Length < STATE_BYTE_COUNT)
+ {
+ throw new ArgumentException("Byte span too short!");
+ }
+ #endif
+
+ fixed (byte* ptr = bytes)
+ {
+ var offset = 0;
+
+ for (var i = 0; i < 16; i += 1)
+ {
+ State[i] = Unsafe.Read(ptr + offset);
+ offset += 4;
+ }
+
+ Index = Unsafe.Read(ptr + offset);
+ }
+ }
+
+ private uint NextInternal()
+ {
+ uint a, b, c, d;
+ a = State[Index];
+ c = State[(Index+13)&15];
+ b = a^c^(a<<16)^(c<<15);
+ c = State[(Index+9)&15];
+ c ^= (c>>11);
+ a = State[Index] = b^c;
+ d = (uint) (a ^((a<<5)&0xDA442D24UL));
+ Index = (Index + 15)&15;
+ a = State[Index];
+ State[Index] = a^b^d^(a<<2)^(b<<18)^(c<<28);
+ return State[Index];
+ }
+
+ // .NET Random API always returns a non-negative signed int. Fun!
+ public int Next()
+ {
+ return (int) (NextInternal() >> 1); // bitshift right to get rid of signed bit
+ }
+
+ public int Next(int n)
+ {
+ var next = NextInternal();
+ return (int) (((double) next) * n / uint.MaxValue);
+ }
+
+ public int Next(int min, int max)
+ {
+ var diff = max - min;
+ var next = Next(diff);
+ return min + next;
+ }
+
+ public long NextInt64()
+ {
+ long next = NextInternal();
+ next <<= 32;
+ next |= NextInternal();
+ return next;
+ }
+
+ public long NextInt64(long n)
+ {
+ var next = NextInt64();
+ return (long) (((double) next) * n / ulong.MaxValue);
+ }
+
+ public long NextInt64(long min, long max)
+ {
+ var diff = max - min;
+ var next = NextInt64(diff);
+ return min + next;
+ }
+
+ public double NextDouble()
+ {
+ var n = NextInternal();
+ return ((double) n) / uint.MaxValue;
}
}
}