blob: c6a9e9dd83b8de7c0f5773845a812fa201926f35 [file] [log] [blame]
//
// Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// WindowsTimer.cpp: Implementation of a high precision timer class on Windows
#include "windows/WindowsTimer.h"
WindowsTimer::WindowsTimer() : mRunning(false), mStartTime(0), mStopTime(0)
{
}
void WindowsTimer::start()
{
LARGE_INTEGER frequency;
QueryPerformanceFrequency(&frequency);
mFrequency = frequency.QuadPart;
LARGE_INTEGER curTime;
QueryPerformanceCounter(&curTime);
mStartTime = curTime.QuadPart;
mRunning = true;
}
void WindowsTimer::stop()
{
LARGE_INTEGER curTime;
QueryPerformanceCounter(&curTime);
mStopTime = curTime.QuadPart;
mRunning = false;
}
double WindowsTimer::getElapsedTime() const
{
LONGLONG endTime;
if (mRunning)
{
LARGE_INTEGER curTime;
QueryPerformanceCounter(&curTime);
endTime = curTime.QuadPart;
}
else
{
endTime = mStopTime;
}
return static_cast<double>(endTime - mStartTime) / mFrequency;
}
Timer *CreateTimer()
{
return new WindowsTimer();
}