154 lines
4.3 KiB
C++
154 lines
4.3 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library 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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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSG_TIMER
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#define OSG_TIMER 1
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#include <osg/Export>
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namespace osg {
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#if defined(_MSC_VER) && !defined(__clang__)
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typedef unsigned __int64 Timer_t;
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#else
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typedef unsigned long long Timer_t;
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#endif
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/** Timer class is used for measuring elapsed time or time between two points. */
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class OSG_EXPORT Timer {
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public:
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Timer();
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~Timer() {}
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static Timer* instance();
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/** Get the timers tick value.*/
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Timer_t tick() const;
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/** Set the start.*/
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void setStartTick() { _startTick = tick(); }
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void setStartTick(Timer_t t) { _startTick = t; }
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Timer_t getStartTick() const { return _startTick; }
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/** Get elapsed time in seconds.*/
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inline double time_s() const { return delta_s(_startTick, tick()); }
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/** Get elapsed time in milliseconds.*/
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inline double time_m() const { return delta_m(_startTick, tick()); }
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/** Get elapsed time in microseconds.*/
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inline double time_u() const { return delta_u(_startTick, tick()); }
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/** Get elapsed time in nanoseconds.*/
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inline double time_n() const { return delta_n(_startTick, tick()); }
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/** Get the time in seconds between timer ticks t1 and t2.*/
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inline double delta_s( Timer_t t1, Timer_t t2 ) const { return (t2>t1) ? (double)(t2 - t1)*_secsPerTick : -(double)(t1 - t2)*_secsPerTick; }
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/** Get the time in milliseconds between timer ticks t1 and t2.*/
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inline double delta_m( Timer_t t1, Timer_t t2 ) const { return delta_s(t1,t2)*1e3; }
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/** Get the time in microseconds between timer ticks t1 and t2.*/
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inline double delta_u( Timer_t t1, Timer_t t2 ) const { return delta_s(t1,t2)*1e6; }
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/** Get the time in nanoseconds between timer ticks t1 and t2.*/
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inline double delta_n( Timer_t t1, Timer_t t2 ) const { return delta_s(t1,t2)*1e9; }
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/** Get the number of seconds per tick. */
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inline double getSecondsPerTick() const { return _secsPerTick; }
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protected :
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Timer_t _startTick;
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double _secsPerTick;
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};
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/** Helper class for timing sections of code. */
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class ElapsedTime
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{
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public:
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inline ElapsedTime(double* elapsedTime, osg::Timer* timer = 0):
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_time(elapsedTime)
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{
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init(timer);
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}
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inline ElapsedTime(osg::Timer* timer = 0):
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_time(0)
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{
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init(timer);
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}
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inline ~ElapsedTime()
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{
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finish();
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}
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inline void reset()
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{
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_startTick = _timer->tick();
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}
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/** elapsed time in seconds. */
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inline double elapsedTime() const
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{
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return _timer->delta_s(_startTick, _timer->tick());
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}
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/** elapsed time in milliseconds. */
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inline double elapsedTime_m() const
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{
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return _timer->delta_m(_startTick, _timer->tick());
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}
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/** elapsed time in microseconds. */
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inline double elapsedTime_u() const
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{
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return _timer->delta_u(_startTick, _timer->tick());
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}
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/** elapsed time in nanoseconds. */
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inline double elapsedTime_n() const
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{
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return _timer->delta_n(_startTick, _timer->tick());
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}
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inline void finish()
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{
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Timer_t endTick = _timer->tick();
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if (_time) *_time += _timer->delta_s(_startTick, endTick);
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_startTick = endTick;
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}
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protected:
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inline void init(osg::Timer* timer)
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{
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if (timer) _timer = timer;
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else _timer = osg::Timer::instance();
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_startTick = _timer->tick();
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}
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double* _time;
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Timer* _timer;
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Timer_t _startTick;
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};
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}
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#endif
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