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// Copyright 2019 The Dawn & Tint Authors
//
// 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. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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 <windows.h>
#include "dawn/utils/Timer.h"
namespace dawn::utils {
class WindowsTimer : public Timer {
public:
WindowsTimer() : Timer(), mRunning(false), mFrequency(0) {}
~WindowsTimer() override = default;
void Start() override {
LARGE_INTEGER curTime;
QueryPerformanceCounter(&curTime);
mStartTime = curTime.QuadPart;
// Cache the frequency
GetFrequency();
mRunning = true;
}
void Stop() override {
LARGE_INTEGER curTime;
QueryPerformanceCounter(&curTime);
mStopTime = curTime.QuadPart;
mRunning = false;
}
double GetElapsedTime() const override {
LONGLONG endTime;
if (mRunning) {
LARGE_INTEGER curTime;
QueryPerformanceCounter(&curTime);
endTime = curTime.QuadPart;
} else {
endTime = mStopTime;
}
return static_cast<double>(endTime - mStartTime) / mFrequency;
}
double GetAbsoluteTime() override {
LARGE_INTEGER curTime;
QueryPerformanceCounter(&curTime);
return static_cast<double>(curTime.QuadPart) / GetFrequency();
}
private:
LONGLONG GetFrequency() {
if (mFrequency == 0) {
LARGE_INTEGER frequency = {};
QueryPerformanceFrequency(&frequency);
mFrequency = frequency.QuadPart;
}
return mFrequency;
}
bool mRunning;
LONGLONG mStartTime;
LONGLONG mStopTime;
LONGLONG mFrequency;
};
Timer* CreateTimer() {
return new WindowsTimer();
}
} // namespace dawn::utils