mirror of
https://github.com/RPCS3/rpcs3.git
synced 2024-11-18 02:11:28 +00:00
42 lines
918 B
C
42 lines
918 B
C
|
//Mersenne-Twister 19937 pseudorandom number generator.
|
||
|
|
//Reference implementation at:
|
||
|
|
//http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/CODES/mt19937ar.c
|
||
|
|
|
||
|
|
#ifndef _MT19937_H_
|
||
|
|
#define _MT19937_H_
|
||
|
|
|
||
|
|
/*! State size. */
|
||
|
|
#define MT_N 624
|
||
|
|
#define MT_M 397
|
||
|
|
#define MT_MATRIX_A 0x9908b0df
|
||
|
|
#define MT_UPPER_MASK 0x80000000
|
||
|
|
#define MT_LOWER_MASK 0x7fffffff
|
||
|
|
|
||
|
|
/*! Mersenne-Twister 19937 context. */
|
||
|
|
typedef struct _mt19937_ctxt
|
||
|
|
{
|
||
|
|
/*! State. */
|
||
|
|
unsigned int state[MT_N];
|
||
|
|
/*! Index. */
|
||
|
|
unsigned int idx;
|
||
|
|
} mt19937_ctxt_t;
|
||
|
|
|
||
|
|
/*!
|
||
|
|
* \brief Initialize Mersenne-Twister 19937 context.
|
||
|
|
*
|
||
|
|
* \param ctxt Mersenne-Twister 19937 context.
|
||
|
|
* \param seed Random seed.
|
||
|
|
*/
|
||
|
|
void mt19937_init(mt19937_ctxt_t *ctxt, unsigned int seed);
|
||
|
|
|
||
|
|
/*!
|
||
|
|
* \brief Update Mersenne-Twister 19937 state.
|
||
|
|
*
|
||
|
|
* \param ctxt Mersenne-Twister 19937 context.
|
||
|
|
*
|
||
|
|
* \return Generated pseudorandom number.
|
||
|
|
*/
|
||
|
|
unsigned int mt19937_update(mt19937_ctxt_t *ctxt);
|
||
|
|
|
||
|
|
#endif
|