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Properly setup seed in RNG

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(cherry picked from commit 6280be46a6)
This commit is contained in:
Chaosus
2019-03-17 20:51:51 +03:00
committed by Rémi Verschelde
parent 29a6e7d306
commit 1dd72dca45
4 changed files with 15 additions and 5 deletions
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10
thirdparty/misc/pcg.cpp vendored
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@@ -13,3 +13,13 @@ uint32_t pcg32_random_r(pcg32_random_t* rng)
uint32_t rot = oldstate >> 59u;
return (xorshifted >> rot) | (xorshifted << ((-rot) & 31));
}
// Source from http://www.pcg-random.org/downloads/pcg-c-basic-0.9.zip
void pcg32_srandom_r(pcg32_random_t* rng, uint64_t initstate, uint64_t initseq)
{
rng->state = 0U;
rng->inc = (initseq << 1u) | 1u;
pcg32_random_r(rng);
rng->state += initstate;
pcg32_random_r(rng);
}