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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.
*/
//osgParticle - Copyright (C) 2002 Marco Jez

#ifndef OSGPARTICLE_MODULARPROGRAM
#define OSGPARTICLE_MODULARPROGRAM 1

#include <osgParticle/Export>
#include <osgParticle/Program>
#include <osgParticle/Operator>

#include <osg/CopyOp>
#include <osg/Object>
#include <osg/Node>
#include <osg/NodeVisitor>

namespace osgParticle
{

    /**    A program class for performing operations on particles using a sequence of <I>operators</I>.
        To use a <CODE>ModularProgram</CODE> you have to create some <CODE>Operator</CODE> objects and
        add them to the program.
        All operators will be applied to each particle in the same order they've been added to the program.
    */
    class OSGPARTICLE_EXPORT ModularProgram: public Program {
    public:
        ModularProgram();
        ModularProgram(const ModularProgram& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);

        META_Node(osgParticle,ModularProgram);

        /// Get the number of operators.
        inline int numOperators() const;

        /// Add an operator to the list.
        inline void addOperator(Operator* o);

        /// Get a pointer to an operator in the list.
        inline Operator* getOperator(int i);

        /// Get a const pointer to an operator in the list.
        inline const Operator* getOperator(int i) const;

        /// Remove an operator from the list.
        inline void removeOperator(int i);

    protected:
        virtual ~ModularProgram() {}
        ModularProgram& operator=(const ModularProgram&) { return *this; }

        void execute(double dt);

    private:
        typedef std::vector<osg::ref_ptr<Operator> > Operator_vector;

        Operator_vector _operators;
    };

    // INLINE FUNCTIONS

    inline int ModularProgram::numOperators() const
    {
        return static_cast<int>(_operators.size());
    }

    inline void ModularProgram::addOperator(Operator* o)
    {
        _operators.push_back(o);
    }

    inline Operator* ModularProgram::getOperator(int i)
    {
        return _operators[i].get();
    }

    inline const Operator* ModularProgram::getOperator(int i) const
    {
        return _operators[i].get();
    }

    inline void ModularProgram::removeOperator(int i)
    {
        _operators.erase(_operators.begin()+i);
    }


}

#endif