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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 <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