AuroraRuntime/Source/RNG/AuRandomDevice.hpp

/***
    Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: AuRandomDevice.hpp
    Date: 2021-9-3
    Author: Reece
***/
#pragma once

#include "AuWELL.hpp"

namespace Aurora::RNG
{
    struct RandomDevice : IRandomDevice
    {
        RandomDevice();
        RandomDevice(const RandomDef & def);

        void     Read(Memory::MemoryViewWrite view) override;

        AuString NextString(AuUInt32 uLength, ERngStringCharacters type) override;
        void     NextString(char *pString, AuUInt32 uLength, ERngStringCharacters type) override;
        AuUInt8  NextByte() override;
        bool     NextBoolean() override;
        AuUInt32 NextU32() override;
        AuUInt64 NextU64() override;
        AuInt32  NextInt(AuInt32 iMin, AuInt32 iMax) override;
        AuUInt32 NextU32(AuUInt32 uMin, AuUInt32 uMax)    override;
        double   NextDecimal() override;
        double   NextNumber(double dMin, double dMax) override;
        AuUInt32 NextIndex(AuUInt32 uCount /* = max + 1*/) override;

        AuMemoryViewRead ToSeed() override;
        
        void Init(const RandomDef &def);

    private:
        RandomDef def_;
        WELLRand fast_;

        bool DecGeometric(int x);
        double UniformFloatInRange(double udMin, double udMax);
    };
}