66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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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//osgParticle - Copyright (C) 2002 Marco Jez
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#ifndef OSGPARTICLE_RANDOMRATECOUNTER_
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#define OSGPARTICLE_RANDOMRATECOUNTER_ 1
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#include <osgParticle/VariableRateCounter>
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#include <osg/CopyOp>
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#include <osg/Object>
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namespace osgParticle
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{
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class RandomRateCounter: public VariableRateCounter {
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public:
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inline RandomRateCounter();
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inline RandomRateCounter(const RandomRateCounter ©, const osg::CopyOp ©op = osg::CopyOp::SHALLOW_COPY);
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META_Object(osgParticle, RandomRateCounter);
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/// Return the number of particles to be created in this frame
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inline int numParticlesToCreate(double dt) const;
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protected:
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virtual ~RandomRateCounter() {}
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mutable float np_;
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};
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// INLINE FUNCTIONS
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inline RandomRateCounter::RandomRateCounter()
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: VariableRateCounter(), np_(0)
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{
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}
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inline RandomRateCounter::RandomRateCounter(const RandomRateCounter ©, const osg::CopyOp ©op)
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: VariableRateCounter(copy, copyop), np_(copy.np_)
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{
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}
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inline int RandomRateCounter::numParticlesToCreate(double dt) const
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{
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np_ += dt * getRateRange().get_random();
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int n = static_cast<int>(np_);
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np_ -= n;
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return n;
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}
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}
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#endif
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