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// 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 <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