68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/*
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This file is part of Nori, a simple educational ray tracer
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Copyright (c) 2015 by Wenzel Jakob
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Nori is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License Version 3
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as published by the Free Software Foundation.
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Nori is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <nori/common.h>
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#include <chrono>
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NORI_NAMESPACE_BEGIN
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/**
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* \brief Simple timer with millisecond precision
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*
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* This class is convenient for collecting performance data
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*/
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class Timer {
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public:
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/// Create a new timer and reset it
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Timer() { reset(); }
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/// Reset the timer to the current time
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void reset() { start = std::chrono::system_clock::now(); }
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/// Return the number of milliseconds elapsed since the timer was last reset
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double elapsed() const {
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auto now = std::chrono::system_clock::now();
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auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(now - start);
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return (double) duration.count();
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}
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/// Like \ref elapsed(), but return a human-readable string
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std::string elapsedString(bool precise = false) const {
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return timeString(elapsed(), precise);
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}
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/// Return the number of milliseconds elapsed since the timer was last reset and then reset it
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double lap() {
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auto now = std::chrono::system_clock::now();
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auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(now - start);
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start = now;
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return (double) duration.count();
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}
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/// Like \ref lap(), but return a human-readable string
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std::string lapString(bool precise = false) {
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return timeString(lap(), precise);
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}
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private:
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std::chrono::system_clock::time_point start;
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};
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NORI_NAMESPACE_END
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