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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 XOROSHIRO_RANDOM_H
#define XOROSHIRO_RANDOM_H
#include <stdint.h>
#include <stdbool.h>
/* XoroShiro: A fast 128-bit state Xoroshiro-based PRNG with good quality.
*
* Xoroshiro family generators offer an excellent balance between speed and
* quality for real-time applications. This implementation maintains two 64-bit
* state variables.
*
* Pros:
* - Very fast; suitable for gameplay and procedural generation
* - Good statistical properties; long period (~2^128-1)
* - Deterministic and reproducible across platforms
*
* Cons:
* - Not cryptographically secure
* - Low bits may show weaker properties in some variants
*/
typedef struct {
uint64_t s0;
uint64_t s1;
} xoroshiro_random_t;
/* Initialize the generator with two seeds */
void xoroshiro_init(xoroshiro_random_t *rng, uint64_t seed1, uint64_t seed2);
/* Generate next random 32-bit unsigned integer */
uint32_t xoroshiro_next_uint(xoroshiro_random_t *rng);
/* Generate next random 64-bit unsigned integer */
uint64_t xoroshiro_next_ulong(xoroshiro_random_t *rng);
/* Generate next random float in [0, 1) */
float xoroshiro_next_float(xoroshiro_random_t *rng);
/* Generate next random double in [0, 1) */
double xoroshiro_next_double(xoroshiro_random_t *rng);
#endif /* XOROSHIRO_RANDOM_H */
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