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