| // 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 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 |