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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSG_TIMER
#define OSG_TIMER 1
#include <osg/Export>
namespace osg {
#if defined(_MSC_VER)
typedef __int64 Timer_t;
#else
typedef unsigned long long Timer_t;
#endif
/** Timer class is used for measuring elapsed time or time between two points. */
class OSG_EXPORT Timer {
public:
Timer();
~Timer() {}
static Timer* instance();
/** Get the timers tick value.*/
Timer_t tick() const;
/** Set the start.*/
void setStartTick() { _startTick = tick(); }
void setStartTick(Timer_t t) { _startTick = t; }
Timer_t getStartTick() const { return _startTick; }
/** Get elapsed time in seconds.*/
inline double time_s() const { return delta_s(_startTick, tick()); }
/** Get elapsed time in milliseconds.*/
inline double time_m() const { return delta_m(_startTick, tick()); }
/** Get elapsed time in micoseconds.*/
inline double time_u() const { return delta_u(_startTick, tick()); }
/** Get elapsed time in nanoseconds.*/
inline double time_n() const { return delta_n(_startTick, tick()); }
/** Get the time in seconds between timer ticks t1 and t2.*/
inline double delta_s( Timer_t t1, Timer_t t2 ) const { return (double)(t2 - t1)*_secsPerTick; }
/** Get the time in milliseconds between timer ticks t1 and t2.*/
inline double delta_m( Timer_t t1, Timer_t t2 ) const { return delta_s(t1,t2)*1e3; }
/** Get the time in microseconds between timer ticks t1 and t2.*/
inline double delta_u( Timer_t t1, Timer_t t2 ) const { return delta_s(t1,t2)*1e6; }
/** Get the time in nanoseconds between timer ticks t1 and t2.*/
inline double delta_n( Timer_t t1, Timer_t t2 ) const { return delta_s(t1,t2)*1e9; }
/** Get the the number of seconds per tick. */
inline double getSecondsPerTick() const { return _secsPerTick; }
protected :
Timer_t _startTick;
double _secsPerTick;
};
}
#endif
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