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76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
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/*
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** i_time.cpp
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** Implements the timer
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**
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**---------------------------------------------------------------------------
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** Copyright 1998-2016 Randy Heit
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** Copyright 2017 Magnus Norddahl
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#include <chrono>
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#include <thread>
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#include "i_time.h"
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#include "c_cvars.h"
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#include "printf.h"
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//==========================================================================
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//
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// Tick time functions
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//
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//==========================================================================
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static double TimeScale = 1.0;
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static uint64_t GetClockTimeNS()
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{
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using namespace std::chrono;
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return (uint64_t)((duration_cast<microseconds>(steady_clock::now().time_since_epoch()).count()) * (uint64_t)(TimeScale * 1000));
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}
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static uint64_t MSToNS(unsigned int ms)
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{
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return static_cast<uint64_t>(ms) * 1'000'000;
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}
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static uint64_t NSToMS(uint64_t ns)
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{
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return static_cast<uint64_t>(ns / 1'000'000);
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}
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uint64_t I_nsTime()
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{
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return GetClockTimeNS();
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}
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uint64_t I_msTime()
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{
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return NSToMS(I_nsTime());
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}
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