axmol/extensions/Particle3D/ParticleUniverse/CCPUParticle3DForceField.h

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#ifndef __CC_PU_PARTICLE_3D_FORCE_FIELD_H__
#define __CC_PU_PARTICLE_3D_FORCE_FIELD_H__

#include "base/CCRef.h"
#include "math/CCMath.h"
#include "CCPUParticle3DNoise.h"

NS_CC_BEGIN

/** Pure virtual ForceFieldCalculationFactory
*/
class  PUForceFieldCalculationFactory
{
public:
    // Const
    static const Vec3 DEFAULT_WORLDSIZE;

    PUForceFieldCalculationFactory(void) : 
        _octaves(2),
        _frequency(1.0f),
        _amplitude(1.0f),
        _persistence(1.0f),
        _mappedPosition(Vec3::ZERO),
        _mapScale(Vec3::ZERO),
        _worldSize(DEFAULT_WORLDSIZE)
    {
    };
    virtual ~PUForceFieldCalculationFactory(void){};

    /** Generates the force field
    @remarks
        This function takes several arguments. 
        - forceFieldSize defines the internal dimensions of the force field. 
        - octaves, frequency, amplitude and persistence define the noise that is being generated.
        - worldSize defines the dimensions in the real world (scene).
    */
    virtual void generate(unsigned int forceFieldSize, 
        unsigned short octaves, 
        double frequency, 
        double amplitude, 
        double persistence, 
        const Vec3& worldSize) = 0;

    /** Determine force, based on the position of a particle.
    #remarks
        The position is the position of a particle. The argument 'delta' defines the radius around the position that contributes to the 
        calculation of the force.
    */
    virtual void determineForce(const Vec3& position, Vec3& force, float delta) = 0;

    /** Default Getters/Setters
    */
    virtual unsigned short getOctaves(void) const;
    virtual void setOctaves(unsigned short octaves);
    virtual double getFrequency(void) const;
    virtual void setFrequency(double frequency);
    virtual double getAmplitude(void) const;
    virtual void setAmplitude(double amplitude);
    virtual double getPersistence(void) const;
    virtual void setPersistence(double persistence);
    virtual unsigned int getForceFieldSize(void) const;
    virtual void setForceFieldSize(unsigned int forceFieldSize);
    virtual Vec3 getWorldSize(void) const;
    virtual void setWorldSize(const Vec3& worldSize);

protected:
    PUNoise3D _noise3D;
    unsigned short _octaves;
    double _frequency;
    double _amplitude;
    double _persistence;
    Vec3 _mapScale;
    Vec3 _worldSize;
    Vec3 _mappedPosition;
};
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------

/** Factory class to calculate forces in realtime
*/
class PURealTimeForceFieldCalculationFactory : public PUForceFieldCalculationFactory
{
public:
    PURealTimeForceFieldCalculationFactory(void) : PUForceFieldCalculationFactory() {};
    virtual ~PURealTimeForceFieldCalculationFactory(void){};

    /** Override from ForceFieldCalculationFactory
    */
    virtual void generate(unsigned int forceFieldSize, 
        unsigned short octaves, 
        double frequency, 
        double amplitude, 
        double persistence, 
        const Vec3& worldSize);

    /** Override from ForceFieldCalculationFactory
    */
    virtual void determineForce(const Vec3& position, Vec3& force, float delta);
};
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------


/** Force Field Affector Class:
    This class defines a force field to affect the particle direction. The force field is based on 3D noise. The force can be calculated in
    realtime or based on a precreated 3D force field matrix, which essentially involves one lookup. To speed things up, the 3d matrix can be
    precreated in a separate thread (optionally).
*/
class PUForceField
{
    public:
        enum ForceFieldType
        {
            FF_REALTIME_CALC,
            FF_MATRIX_CALC
        };

        PUForceField();
        virtual ~PUForceField();

        /** Initialises a ForceField */
        virtual void initialise(ForceFieldType type,
            const Vec3& position,
            unsigned int forceFieldSize, 
            unsigned short octaves, 
            double frequency, 
            double amplitude, 
            double persistence, 
            const Vec3& worldSize);

        /** Initialises a ForceField */
        virtual void initialise(ForceFieldType type,
            unsigned int forceFieldSize, 
            unsigned short octaves, 
            double frequency, 
            double amplitude, 
            double persistence, 
            const Vec3& worldSize);

        /** Get/Set the base position of the force field */
        const Vec3& getForceFieldPositionBase(void) const;
        void setForceFieldPositionBase(const Vec3& position);

        /** Calculate the force, based on a certain position */
        void determineForce(const Vec3& position, Vec3& force, float delta);

        /** Getters/Setters
        */
        virtual unsigned short getOctaves(void) const;
        virtual void setOctaves(unsigned short octaves);
        virtual double getFrequency(void) const;
        virtual void setFrequency(double frequency);
        virtual double getAmplitude(void) const;
        virtual void setAmplitude(double amplitude);
        virtual double getPersistence(void) const;
        virtual void setPersistence(double persistence);
        virtual unsigned int getForceFieldSize(void) const;
        virtual void setForceFieldSize(unsigned int forceFieldSize);
        virtual Vec3 getWorldSize(void) const;
        virtual void setWorldSize(const Vec3& worldSize);
            
        /** Get/Set the Forcefield type
        */
        const ForceFieldType getForceFieldType(void) const;
        void setForceFieldType(const ForceFieldType forceFieldType);

    protected:
        unsigned short _octaves;
        double _frequency;
        double _amplitude;
        double _persistence;
        Vec3 _worldSize;
        unsigned int _forceFieldSize;
        PUForceFieldCalculationFactory* _forceFieldCalculationFactory; // Internal factory that creates a certain force field type
        Vec3 _forceFieldPositionBase; // Position of the force field
        ForceFieldType _forceFieldType;

        /** Get/Set/Create ForceFieldCalculationFactory */
        PUForceFieldCalculationFactory* getForceFieldCalculationFactory() const;
        void setForceFieldCalculationFactory(PUForceFieldCalculationFactory* forceFieldCalculationFactory);
        PUForceFieldCalculationFactory* createForceFieldCalculationFactory(ForceFieldType type);
};
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------

NS_CC_END

#endif