text: /*
  ** 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 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());
  }
  
  