OgrePathAffector.h

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//    Copyright (C) 2006-2013 Dylan Blair
//
//    email: dblair@alumni.cs.utexas.edu
//
//    This library is free software; you can redistribute it and/or
//    modify it under the terms of the GNU Lesser General Public
//    License as published by the Free Software Foundation; either
//    version 2.1 of the License, or (at your option) any later version.
//
//    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 GNU
//    Lesser General Public License for more details.
//
//    You should have received a copy of the GNU Lesser General Public
//    License along with this library; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#ifndef OGRE_PATH_AFFECTOR_H
#define OGRE_PATH_AFFECTOR_H

#include "OgreParticlePluginPrerequisites.h"
#include "CParticleObject.h"
#include "../../Libs/Utils_LIB/UPrecisionTimer.h"

#include <OgreMath.h>
#include <OgreParticleAffector.h>
#include <OgreParticleAffectorFactory.h>
#include <OgreStringInterface.h>

#define MAX_PATHS 10
#define MIN_SECS_BEFORE_NEW_PATH 1.0f

namespace Ogre {
    class PathEmitter;

    class _OgreParticleFXExport PathAffector : public ParticleAffector {
        friend class Ogre::PathEmitter;
    public:
        class CmdInterpolatorType : public ParamCommand {
        public:
            String doGet(const void* target) const;
            void doSet(void* target, const String& val);
        };

        PathAffector(ParticleSystem* psys);
        virtual ~PathAffector();

        void _initParticle(Particle* pParticle);

        void _affectParticles(ParticleSystem* pSystem, Real timeElapsed);

        inline void addPath(const OpenSkyNet::Math::Path& path_, const float& interpolatorValue_, bool force_=false) {
            if (!force_ && (_timer.stop() < MIN_SECS_BEFORE_NEW_PATH)) return;

            if (_currPathIndex == MAX_PATHS)
                _currPathIndex = 0;
            _lastPathIndex = _currPathIndex;

            _particlePaths[_currPathIndex] = path_;
            _interpolatorValues[_currPathIndex] = &interpolatorValue_;
            ++_currPathIndex;
            _timer.start();
        }

        inline OpenSkyNet::Math::Path& getPath(unsigned int index_) { return _particlePaths[index_]; }

        inline void setInterpolatorType(OpenSkyNet::Math::Interpolator::TYPE interpolatorType_) { _interpolatorType = interpolatorType_; }

        inline OpenSkyNet::Math::Interpolator::TYPE getInterpolatorType() const { return _interpolatorType; }

        static CmdInterpolatorType msInterpolatorTypeCmd;
    protected:
        OpenSkyNet::Utils::PrecisionTimer _timer;
        OpenSkyNet::Core::PathUpdater* _pathUpd;
        std::map<Ogre::Particle*, OpenSkyNet::Core::ParticleObject*> _partMap;
        OpenSkyNet::Math::Path _particlePaths[MAX_PATHS];
        const float* _interpolatorValues[MAX_PATHS];
        unsigned int _currPathIndex;
        unsigned int _lastPathIndex;
        OpenSkyNet::Math::Interpolator::TYPE _interpolatorType;
    };

    class _OgreParticleFXExport PathAffectorFactory : public ParticleAffectorFactory {
        String getName() const { return "Path"; }

        ParticleAffector* createAffector(ParticleSystem* psys) {
            ParticleAffector* p = new PathAffector(psys);
            mAffectors.push_back(p);
            return p;
        }
    };
}

#endif //OGRE_PATH_AFFECTOR_H