// Copyright (C) by Josh Blum. See LICENSE.txt for licensing information.

//Boost chrono has awesome high res timer!
//But its only in very recent boosts,
//so we have this little wrapper...
//now/tps inspired by libnumanuma.

#ifndef INCLUDED_GRAS_CHRONO_HPP
#define INCLUDED_GRAS_CHRONO_HPP

#include <gras/gras.hpp>

namespace gras
{
    typedef long long time_ticks_t;

    //! Get the time now in tick counts
    time_ticks_t time_now(void);

    //! Get the number of ticks per second
    time_ticks_t time_tps(void);
}

//--------------------------------------------------------------------//
//------------------ implementation details below --------------------//
//--------------------------------------------------------------------//

#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)

#include <windows.h>

namespace gras
{

    GRAS_FORCE_INLINE time_ticks_t time_now(void)
    {
        LARGE_INTEGER counts;
        QueryPerformanceCounter(&counts);
        return counts.QuadPart;
    }

    GRAS_FORCE_INLINE time_ticks_t time_tps(void)
    {
        LARGE_INTEGER freq;
        QueryPerformanceFrequency(&freq);
        return freq.QuadPart;
    }

} //namespace gras

#else

#include <ctime>

namespace gras
{

    GRAS_FORCE_INLINE time_ticks_t time_now(void)
    {
        struct timespec ts;
        clock_gettime(CLOCK_MONOTONIC, &ts);
        return ts.tv_sec*1000000000UL + ts.tv_nsec;
    }

    GRAS_FORCE_INLINE time_ticks_t time_tps(void)
    {
        return 1000000000UL;
    }

} //namespace gras

#endif

#endif /*INCLUDED_GRAS_CHRONO_HPP*/