UnleashedRecomp/UnleashedRecomp/framework.h

#pragma once

#ifdef _MSVC
    #define SWA_DLLEXPORT __declspec(dllexport)
    #define SWA_DLLIMPORT __declspec(dllimport)
#else
    #define SWA_DLLEXPORT __attribute__((dllexport))
    #define SWA_DLLIMPORT __attribute__((dllimport))
#endif

#ifdef SWA_IMPL
#define SWA_API extern "C" SWA_DLLEXPORT
#else
#define SWA_API extern "C" SWA_DLLIMPORT
#endif

template<typename T>
void ByteSwap(T& value)
{
    value = std::byteswap(value);
}

template<typename T>
T RoundUp(const T& in_rValue, uint32_t in_round)
{
    return (in_rValue + in_round - 1) & ~(in_round - 1);
}

template<typename T>
T RoundDown(const T& in_rValue, uint32_t in_round)
{
    return in_rValue & ~(in_round - 1);
}

inline bool FileExists(const char* path)
{
    const auto attributes = GetFileAttributesA(path);
    return attributes != INVALID_FILE_ATTRIBUTES && !(attributes & FILE_ATTRIBUTE_DIRECTORY);

}

inline bool DirectoryExists(const char* path)
{
    const auto attributes = GetFileAttributesA(path);
    return attributes != INVALID_FILE_ATTRIBUTES && !!(attributes & FILE_ATTRIBUTE_DIRECTORY);
}

inline size_t StringHash(const std::string_view& str)
{
    return XXH3_64bits(str.data(), str.size());
}

template<typename TValue>
constexpr size_t FirstBitLow(TValue value)
{
    constexpr size_t nbits = sizeof(TValue) * 8;
    constexpr auto zero = TValue{};
    constexpr auto one = static_cast<TValue>(1);

    for (size_t i = 0; i < nbits; i++)
    {
        if ((value & (one << i)) != zero)
        {
            return i;
        }
    }

    return 0;
}