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/*
* The MIT License
*
* Copyright (c) 2016-2020 JOML
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.joml;
/**
* Pseudo-random number generator.
*
* @author Kai Burjack
*/
public class Random {
/**
* Reference http://xoroshiro.di.unimi.it/
*/
private static final class Xorshiro128 {
/**
* = 0x1p-24f
*/
private static final float INT_TO_FLOAT = Float.intBitsToFloat(864026624);
/**
* Xorshiro128 state
*/
private long _s0;
private long _s1;
/**
* SplitMix64 State
*/
private long state;
Xorshiro128(long seed) {
this.state = seed;
this._s0 = nextSplitMix64();
this._s1 = nextSplitMix64();
}
private long nextSplitMix64() {
long z = state += 0x9e3779b97f4a7c15L;
z = (z ^ (z >>> 30)) * 0xbf58476d1ce4e5b9L;
z = (z ^ (z >>> 27)) * 0x94d049bb133111ebL;
return z ^ (z >>> 31);
}
/**
* Reference: https://github.com/roquendm/
*
* @author roquendm
*/
final float nextFloat() {
return (nextInt() >>> 8) * INT_TO_FLOAT;
}
private int nextInt() {
long s0 = _s0;
long s1 = _s1;
long result = s0 + s1;
s1 ^= s0;
rotateLeft(s0, s1);
return (int) (result & 0xFFFFFFFF);
}
private static long rotl_JDK4(final long x, final int k) {
return (x << k) | (x >>> (64 - k));
}
private static long rotl_JDK5(final long x, final int k) {
return Long.rotateLeft(x, k);
}
private static long rotl(final long x, final int k) {
if (Runtime.HAS_Long_rotateLeft)
return rotl_JDK5(x, k);
return rotl_JDK4(x, k);
}
private void rotateLeft(long s0, long s1) {
_s0 = rotl(s0, 55) ^ s1 ^ (s1 << 14);
_s1 = rotl(s1, 36);
}
/**
* Reference: https://github.com/roquendm/
*
* @author roquendm
*/
final int nextInt(int n) {
// See notes in nextInt. This is
// (on average) a better choice for
// 64-bit VMs.
long r = nextInt() >>> 1;
// sign doesn't matter here
r = (r * n) >> 31;
return (int) r;
}
}
private final Xorshiro128 rnd;
//8020463840 is from "Case File n_221: Kabukicho"
private static long seedHalf = 8020463840L;
private static final sun.misc.Unsafe UNSAFE = getUnsafeInstance();
private static final long seedHalf_offset = seedHalfOffset();
private static long seedHalfOffset() {
try {
return UNSAFE.staticFieldOffset(Random.class.getDeclaredField("seedHalf"));
} catch (Exception e) {
throw new UnsupportedOperationException();
}
}
private static sun.misc.Unsafe getUnsafeInstance() throws SecurityException {
java.lang.reflect.Field[] fields = sun.misc.Unsafe.class.getDeclaredFields();
for (int i = 0; i < fields.length; i++) {
java.lang.reflect.Field field = fields[i];
if (!field.getType().equals(sun.misc.Unsafe.class))
continue;
int modifiers = field.getModifiers();
if (!(java.lang.reflect.Modifier.isStatic(modifiers) && java.lang.reflect.Modifier.isFinal(modifiers)))
continue;
field.setAccessible(true);
try {
return (sun.misc.Unsafe) field.get(null);
} catch (IllegalAccessException e) {
/* Ignore */
}
break;
}
throw new UnsupportedOperationException();
}
public static long newSeed() {
// 3512401965023503517 is from L'Ecuyer, "Tables of Linear Congruential Generators of
// Different Sizes and Good Lattice Structure", 1999
long oldSeedHalf, newSeedHalf;
do {
oldSeedHalf = seedHalf;
newSeedHalf = oldSeedHalf * 3512401965023503517L;
} while (!UNSAFE.compareAndSwapLong(Random.class, seedHalf_offset, oldSeedHalf, newSeedHalf));
return newSeedHalf;
}
/**
* Create a new instance of {@link Random} and initialize it with a random seed.
*/
public Random() {
this(newSeed() ^ System.nanoTime());
}
/**
* Create a new instance of {@link Random} and initialize it with the given seed.
*
* @param seed
* the seed number
*/
public Random(long seed) {
this.rnd = new Xorshiro128(seed);
}
/**
* Generate a uniformly distributed floating-point number in the half-open range [0, 1).
*
* @return a random float in the range [0..1)
*/
public float nextFloat() {
return rnd.nextFloat();
}
/**
* Generate a uniformly distributed integer in the half-open range [0, n).
*
* @param n
* the upper limit (exclusive) of the generated integer
* @return a random integer in the range [0..n)
*/
public int nextInt(int n) {
return rnd.nextInt(n);
}
}
