| // 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 <CoreServices/CoreServices.h> |
| #include <mach/mach.h> |
| #include <mach/mach_time.h> |
| |
| #include "dawn/utils/Timer.h" |
| |
| namespace dawn::utils { |
| |
| class OSXTimer : public Timer { |
| public: |
| OSXTimer() : Timer(), mRunning(false), mSecondCoeff(0) {} |
| |
| ~OSXTimer() override = default; |
| |
| void Start() override { |
| mStartTime = mach_absolute_time(); |
| // Cache secondCoeff |
| GetSecondCoeff(); |
| mRunning = true; |
| } |
| |
| void Stop() override { |
| mStopTime = mach_absolute_time(); |
| mRunning = false; |
| } |
| |
| double GetElapsedTime() const override { |
| if (mRunning) { |
| return mSecondCoeff * (mach_absolute_time() - mStartTime); |
| } else { |
| return mSecondCoeff * (mStopTime - mStartTime); |
| } |
| } |
| |
| double GetAbsoluteTime() override { return GetSecondCoeff() * mach_absolute_time(); } |
| |
| private: |
| double GetSecondCoeff() { |
| // If this is the first time we've run, get the timebase. |
| if (mSecondCoeff == 0.0) { |
| mach_timebase_info_data_t timebaseInfo; |
| mach_timebase_info(&timebaseInfo); |
| |
| mSecondCoeff = timebaseInfo.numer * (1.0 / 1000000000) / timebaseInfo.denom; |
| } |
| |
| return mSecondCoeff; |
| } |
| |
| bool mRunning; |
| uint64_t mStartTime; |
| uint64_t mStopTime; |
| double mSecondCoeff; |
| }; |
| |
| Timer* CreateTimer() { |
| return new OSXTimer(); |
| } |
| |
| } // namespace dawn::utils |