dusklight/mods/randomizer/generator/utility/random.cpp

#include "../utility/random.hpp"

namespace randomizer::utility::random
{
    static bool init = false;
    static std::mt19937_64 generator;

    // Initialize with seed specified
    void RandomInit(size_t seed)
    {
        init = true;
        generator = std::mt19937_64 {seed};
    }

    // Returns a random integer in range [min, max-1]
    uint32_t Random(int min, int max)
    {
        if (!init)
        {
            // No seed given, get a random number from device to seed
            const auto seed = static_cast<uint32_t>(std::random_device {}());
            RandomInit(seed);
        }

        auto number = generator();
        return min + (number % (max - min));
    }

    // Returns a random floating point number in [0.0, 1.0]
    double RandomDouble()
    {
        auto number = generator();
        return (double)number / (double)generator.max();
    }

    std::mt19937_64& GetGenerator()
    {
        return generator;
    }
} // namespace randomizer::utility::random