blob: 99e1d734d09484c2b8a6db8729d7dc448351d6a5 [file] [log] [blame]
// Copyright 2019 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <windows.h>
#include "dawn/utils/Timer.h"
namespace 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 utils