120 lines
2.2 KiB
C++
120 lines
2.2 KiB
C++
// File: crn_rand.h
|
|
// See Copyright Notice and license at the end of inc/crnlib.h
|
|
#pragma once
|
|
|
|
namespace crnlib
|
|
{
|
|
class kiss99
|
|
{
|
|
public:
|
|
kiss99();
|
|
|
|
void seed(uint32 i, uint32 j, uint32 k);
|
|
|
|
inline uint32 next();
|
|
|
|
private:
|
|
uint32 x;
|
|
uint32 y;
|
|
uint32 z;
|
|
uint32 c;
|
|
};
|
|
|
|
class well512
|
|
{
|
|
public:
|
|
well512();
|
|
|
|
enum { cStateSize = 16 };
|
|
void seed(uint32 seed[cStateSize]);
|
|
void seed(uint32 seed);
|
|
void seed(uint32 seed1, uint32 seed2, uint32 seed3);
|
|
|
|
inline uint32 next();
|
|
|
|
private:
|
|
uint32 m_state[cStateSize];
|
|
uint32 m_index;
|
|
};
|
|
|
|
class ranctx
|
|
{
|
|
public:
|
|
ranctx() { seed(0xDE149737); }
|
|
|
|
void seed(uint32 seed);
|
|
|
|
inline uint32 next();
|
|
|
|
private:
|
|
uint32 a;
|
|
uint32 b;
|
|
uint32 c;
|
|
uint32 d;
|
|
};
|
|
|
|
class random
|
|
{
|
|
public:
|
|
random();
|
|
random(uint32 i);
|
|
|
|
void seed(uint32 i);
|
|
void seed(uint32 i1, uint32 i2, uint32 i3);
|
|
|
|
uint32 urand32();
|
|
uint64 urand64();
|
|
|
|
// "Fast" variant uses no multiplies.
|
|
uint32 fast_urand32();
|
|
|
|
uint32 bit();
|
|
|
|
// Returns random between [0, 1)
|
|
double drand(double l, double h);
|
|
|
|
float frand(float l, float h);
|
|
|
|
// Returns random between [l, h)
|
|
int irand(int l, int h);
|
|
|
|
// Returns random between [l, h]
|
|
int irand_inclusive(int l, int h);
|
|
|
|
double gaussian(double mean, double stddev);
|
|
|
|
void test();
|
|
|
|
private:
|
|
ranctx m_ranctx;
|
|
kiss99 m_kiss99;
|
|
well512 m_well512;
|
|
};
|
|
|
|
// Simpler, minimal state PRNG
|
|
class fast_random
|
|
{
|
|
public:
|
|
fast_random();
|
|
fast_random(uint32 i);
|
|
fast_random(const fast_random& other);
|
|
fast_random& operator=(const fast_random& other);
|
|
|
|
void seed(uint32 i);
|
|
|
|
uint32 urand32();
|
|
uint64 urand64();
|
|
|
|
int irand(int l, int h);
|
|
|
|
double drand(double l, double h);
|
|
|
|
float frand(float l, float h);
|
|
|
|
private:
|
|
uint32 jsr;
|
|
uint32 jcong;
|
|
};
|
|
|
|
} // namespace crnlib
|