/*
** i_time.cpp
** Implements the timer
**
**---------------------------------------------------------------------------
** Copyright 1998-2016 Randy Heit
** Copyright 2017 Magnus Norddahl
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
**    notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
**    notice, this list of conditions and the following disclaimer in the
**    documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
**    derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/

#include <chrono>
#include <thread>
#include "i_time.h"
#include "c_cvars.h"
#include "printf.h"

//==========================================================================
//
// Tick time functions
//
//==========================================================================

static double TimeScale = 1.0;

static uint64_t GetClockTimeNS()
{
	using namespace std::chrono;
	return (uint64_t)((duration_cast<microseconds>(steady_clock::now().time_since_epoch()).count()) * (uint64_t)(TimeScale * 1000));
}

static uint64_t MSToNS(unsigned int ms)
{
	return static_cast<uint64_t>(ms) * 1'000'000;
}

static uint64_t NSToMS(uint64_t ns)
{
	return static_cast<uint64_t>(ns / 1'000'000);
}

uint64_t I_nsTime()
{
	return GetClockTimeNS();
}

uint64_t I_msTime()
{
	return NSToMS(I_nsTime());
}