#include <cmath>
#include <ctime>

#include <seed.h>

#include <common.h>

#include <rngxx/sm64.h>

static u64 _sm64_next(u64& x)
{
	u64 z = (x += 0x9e3779b97f4a7c15);
	z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
	z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
	return z ^ (z >> 31);
}

namespace rng::seed
{
	splitmix64::splitmix64(u64 u) : m_state(u){}

	u64 splitmix64::generate_seed() { return _sm64_next(m_state); }
	f64 splitmix64::generate_f64() { return generate_seed() / pow(2.0, 64); }

	u64 splitmix64::oneshot(u64& state) { return _sm64_next(state); }
	f64 splitmix64::oneshotf(u64& state) { return _sm64_next(state) / pow(2.0, 64); }

	splitmix64 splitmix64::random() 
	{
		splitmix64 r (oneshot(time(NULL)));	
		return r;
	}
}