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/* MIT License - Copyright (c) 2025 wallstop
* Original C# implementation from: https://github.com/wallstop/unity-helpers
* Converted to C for librandom project
*/
#ifndef SPLITMIX64_H
#define SPLITMIX64_H
#include <stdint.h>
#include <stdbool.h>
/* SplitMix64: A fast 64-bit generator often used as a high-quality seeding/mixing PRNG.
*
* SplitMix64 is widely used to quickly generate well-distributed 64-bit values
* and as a seed source for other generators.
*
* Pros:
* - Very fast; great as a hash/mixer and for seed generation
* - Deterministic, portable, and simple
*
* Cons:
* - Not cryptographically secure
*/
typedef struct {
uint64_t state;
} splitmix64_t;
/* Initialize the generator with a seed */
void splitmix64_init(splitmix64_t *rng, uint64_t seed);
/* Generate next random 32-bit unsigned integer */
uint32_t splitmix64_next_uint(splitmix64_t *rng);
/* Generate next random 64-bit unsigned integer */
uint64_t splitmix64_next_ulong(splitmix64_t *rng);
/* Generate next random float in [0, 1) */
float splitmix64_next_float(splitmix64_t *rng);
/* Generate next random double in [0, 1) */
double splitmix64_next_double(splitmix64_t *rng);
#endif /* SPLITMIX64_H */
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