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