AuroraRuntime/Source/RNG/AuWELL.hpp

#pragma once

struct WELLRand
{
    AuUInt32 state[16];
    int index {};
    AuFutexMutex lock;

    inline WELLRand() = default;

    inline WELLRand(WELLRand &&rand)
    {
        AuMemcpy(this->state, rand.state, sizeof(this->state));
        this->index = rand.index;
    }

    inline WELLRand &operator =(WELLRand &&rand)
    {
        AuMemcpy(this->state, rand.state, sizeof(this->state));
        this->index = rand.index;
        return *this;
    }
};

WELLRand WELL_SeedRand(AuUInt32 seed);
WELLRand WELL_SeedRandBig64(const AuArray<AuUInt8, 64> &seed);
WELLRand WELL_SeedRand64(AuUInt64 seed);
AuUInt32 WELL_NextLong(WELLRand* rand);
void WELL_NextBytes(WELLRand *rand, void *in, AuUInt32 length);