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34 lines
734 B
34 lines
734 B
#include <cmath>
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#include <ctime>
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#include <seed.h>
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#include <common.h>
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#include <rngxx/sm64.h>
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static u64 _sm64_next(u64& x)
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{
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u64 z = (x += 0x9e3779b97f4a7c15);
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z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
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z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
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return z ^ (z >> 31);
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}
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namespace rng::seed
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{
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splitmix64::splitmix64(u64 u) : m_state(u){}
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u64 splitmix64::generate_seed() { return _sm64_next(m_state); }
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f64 splitmix64::generate_f64() { return generate_seed() / pow(2.0, 64); }
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u64 splitmix64::oneshot(u64& state) { return _sm64_next(state); }
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f64 splitmix64::oneshotf(u64& state) { return _sm64_next(state) / pow(2.0, 64); }
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splitmix64 splitmix64::random()
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{
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splitmix64 r (oneshot(time(NULL)));
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return r;
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}
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}
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