90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
// 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 "utils/Timer.h"
|
|
|
|
#include <windows.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
|