ConstantRateCounter
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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 OSGPARTICLE_CONSTANTRATECOUNTER
#define OSGPARTICLE_CONSTANTRATECOUNTER 1
#include <osgParticle/Counter>
#include <osg/Object>
#include <osg/Math>
namespace osgParticle
{
class ConstantRateCounter: public Counter {
public:
ConstantRateCounter():
Counter(),
_minimumNumberOfParticlesToCreate(0),
_numberOfParticlesPerSecondToCreate(0),
_carryOver(0)
{
}
ConstantRateCounter(const ConstantRateCounter& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY):
Counter(copy, copyop),
_minimumNumberOfParticlesToCreate(copy._minimumNumberOfParticlesToCreate),
_numberOfParticlesPerSecondToCreate(copy._numberOfParticlesPerSecondToCreate),
_carryOver(copy._carryOver)
{
}
META_Object(osgParticle, ConstantRateCounter);
void setMinimumNumberOfParticlesToCreate(int minNumToCreate) { _minimumNumberOfParticlesToCreate = minNumToCreate; }
int getMinimumNumberOfParticlesToCreate() const { return _minimumNumberOfParticlesToCreate; }
void setNumberOfParticlesPerSecondToCreate(double numPerSecond) { _numberOfParticlesPerSecondToCreate = numPerSecond; }
double getNumberOfParticlesPerSecondToCreate() const { return _numberOfParticlesPerSecondToCreate; }
virtual int numParticlesToCreate(double dt) const
{
double v = (dt*_numberOfParticlesPerSecondToCreate);
int i = (int)(v);
_carryOver += (v-(double)i);
if (_carryOver>1.0)
{
++i;
_carryOver -= 1.0;
}
return osg::maximum(_minimumNumberOfParticlesToCreate, i);
}
virtual int getEstimatedMaxNumOfParticles(double lifeTime) const
{
int minNumParticles = static_cast<int>(_minimumNumberOfParticlesToCreate*60.0f*lifeTime);
int baseNumPartciles = static_cast<int>(_numberOfParticlesPerSecondToCreate * lifeTime);
return osg::maximum(minNumParticles, baseNumPartciles);
}
protected:
virtual ~ConstantRateCounter() {}
int _minimumNumberOfParticlesToCreate;
double _numberOfParticlesPerSecondToCreate;
mutable double _carryOver;
};
}
#endif
Counter
Math
Object
osgParticle::ConstantRateCounter::_numberOfParticlesPerSecondToCreate
double _numberOfParticlesPerSecondToCreate
Definition ConstantRateCounter:79
osgParticle::ConstantRateCounter::~ConstantRateCounter
virtual ~ConstantRateCounter()
Definition ConstantRateCounter:76
osgParticle::ConstantRateCounter::_carryOver
double _carryOver
Definition ConstantRateCounter:80
osgParticle::ConstantRateCounter::META_Object
META_Object(osgParticle, ConstantRateCounter)
osgParticle::ConstantRateCounter::setNumberOfParticlesPerSecondToCreate
void setNumberOfParticlesPerSecondToCreate(double numPerSecond)
Definition ConstantRateCounter:49
osgParticle::ConstantRateCounter::getEstimatedMaxNumOfParticles
virtual int getEstimatedMaxNumOfParticles(double lifeTime) const
Definition ConstantRateCounter:67
osgParticle::ConstantRateCounter::_minimumNumberOfParticlesToCreate
int _minimumNumberOfParticlesToCreate
Definition ConstantRateCounter:78
osgParticle::ConstantRateCounter::numParticlesToCreate
virtual int numParticlesToCreate(double dt) const
Return the number of particles to be created in this frame.
Definition ConstantRateCounter:53
osgParticle::ConstantRateCounter::getMinimumNumberOfParticlesToCreate
int getMinimumNumberOfParticlesToCreate() const
Definition ConstantRateCounter:47
osgParticle::ConstantRateCounter::getNumberOfParticlesPerSecondToCreate
double getNumberOfParticlesPerSecondToCreate() const
Definition ConstantRateCounter:50
osgParticle::ConstantRateCounter::setMinimumNumberOfParticlesToCreate
void setMinimumNumberOfParticlesToCreate(int minNumToCreate)
Definition ConstantRateCounter:46
osgParticle::ConstantRateCounter::ConstantRateCounter
ConstantRateCounter()
Definition ConstantRateCounter:27
osgParticle::ConstantRateCounter::ConstantRateCounter
ConstantRateCounter(const ConstantRateCounter &copy, const osg::CopyOp &copyop=osg::CopyOp::SHALLOW_COPY)
Definition ConstantRateCounter:35
osgParticle::Counter::Counter
Counter()
Definition Counter:46
osg::CopyOp
Definition CopyOp:41
osg::CopyOp::SHALLOW_COPY
@ SHALLOW_COPY
Definition CopyOp:47
osgParticle
Definition AccelOperator:27
osg::maximum
T maximum(T lhs, T rhs)
Definition Math:85