1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef UNSYNCEDRNG_H_
#define UNSYNCEDRNG_H_
#include "System/float3.h"
// like 5-6x slower than our, but much better distribution
//#define USE_BOOST_RNG
#ifdef USE_BOOST_RNG
#include <boost/random/mersenne_twister.hpp>
#include <boost/random/uniform_01.hpp>
#include <boost/random/uniform_smallint.hpp>
#include <boost/random/uniform_on_sphere.hpp>
#include <boost/random/variate_generator.hpp>
#endif
class UnsyncedRNG
{
public:
UnsyncedRNG();
void Seed(unsigned seed);
/** @brief returns a random unsigned integer in the range [0, (UINT_MAX & 0x7FFF)) */
unsigned operator()() { int r = RandInt(); return *reinterpret_cast<unsigned*>(&r); }
/** @brief returns a random integer in the range [0, (INT_MAX & 0x7FFF)) */
int RandInt();
/** @brief returns a random float in the range [0, 1) */
float RandFloat();
/** @brief returns a random vector with length [0, 1] */
float3 RandVector();
float3 RandVector2D();
/** @brief returns a random number in the range [0, n) */
int operator()(int n);
void operator=(const UnsyncedRNG& urng);
private:
unsigned randSeed;
#ifdef USE_BOOST_RNG
boost::random::mt19937 rng;
boost::random::uniform_01<float> dist01;
boost::random::uniform_smallint<int> distInt;
boost::random::uniform_on_sphere<float> distSphere;
boost::variate_generator<boost::random::mt19937&, boost::uniform_01<float> > gen01;
boost::variate_generator<boost::random::mt19937&, boost::uniform_smallint<int> > genInt;
boost::variate_generator<boost::random::mt19937&, boost::uniform_on_sphere<float> > genSphere;
#endif
};
#endif // UNSYNCEDRNG_H_
|
