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8b41169 | 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 | /* sk_random.h — SnapKitty MLC: PCG32 pseudo-random number generator
*
* Algorithm: PCG-XSH-RR (O'Neill 2014). Period 2^64.
* Stateless reentrant API (_r suffix) + global convenience wrappers.
*
* Authors: Ahmad Ali Parr, Jessica L. Williams (SNAPKITTYWEST)
* Source: SNAPKITTYAGENT9NOVA/MLC
* License: BSL-1.1 / AGPL-3.0 / MPL-2.0
*/
#ifndef SK_RANDOM_H
#define SK_RANDOM_H
#include "sk_defs.h"
typedef struct {
u64 state;
u64 inc;
} sk_prng;
/* ── Seeding ──────────────────────────────────────────────────────── */
void sk_prng_seed_r(sk_prng* rng, u64 initstate, u64 initseq);
void sk_prng_seed(u64 initstate, u64 initseq);
/* ── Generation ───────────────────────────────────────────────────── */
u32 sk_prng_rand_r(sk_prng* rng);
u32 sk_prng_rand(void);
f32 sk_prng_randf_r(sk_prng* rng); /* [0, 1) */
f32 sk_prng_randf(void); /* [0, 1) */
/* Compatibility aliases */
#define prng_state sk_prng
#define prng_seed_r sk_prng_seed_r
#define prng_seed sk_prng_seed
#define prng_rand_r sk_prng_rand_r
#define prng_rand sk_prng_rand
#define prng_randf_r sk_prng_randf_r
#define prng_randf sk_prng_randf
#endif /* SK_RANDOM_H */
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