axmol/extensions/Particle3D/PU/PUAffector.h

/****************************************************************************
 Copyright (C) 2013 Henry van Merode. All rights reserved.
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#ifndef __AX_PU_PARTICLE_3D_AFFECTOR_H__
#define __AX_PU_PARTICLE_3D_AFFECTOR_H__

#include "base/Ref.h"
#include "math/Math.h"
#include "extensions/Particle3D/Particle3DAffector.h"
#include <vector>
#include <string>

NS_AX_BEGIN

struct PUParticle3D;
class PUParticleSystem3D;

class AX_EX_DLL PUAffector : public Particle3DAffector
{
    friend class PUParticleSystem3D;

public:
    /**
    The AffectSpecialisation enumeration is used to specialise the affector even more. This enumeration
    isn't used by all affectors; in some cases it isn't even applicable.
*/
    enum AffectSpecialisation
    {
        AFSP_DEFAULT,
        AFSP_TTL_INCREASE,
        AFSP_TTL_DECREASE
    };

    virtual void notifyStart();
    virtual void notifyStop();
    virtual void notifyPause();
    virtual void notifyResume();
    virtual void notifyRescaled(const Vec3& scale);
    virtual void prepare();
    virtual void unPrepare();
    virtual void preUpdateAffector(float deltaTime);
    virtual void updatePUAffector(PUParticle3D* particle, float delta);
    virtual void postUpdateAffector(float deltaTime);
    virtual void firstParticleUpdate(PUParticle3D* particle, float deltaTime);
    virtual void initParticleForEmission(PUParticle3D* particle);
    void process(PUParticle3D* particle, float delta, bool firstParticle);

    void setLocalPosition(const Vec3& pos) { _position = pos; };
    const Vec3 getLocalPosition() const { return _position; };
    void setMass(float mass);
    float getMass() const;

    /** Calculate the derived position of the affector.
    @remarks
        Note, that in script, the position is set as localspace, while if the affector is
        emitted, its position is automatically transformed. This function always returns
        the derived position.
    */
    const Vec3& getDerivedPosition();

    /** Todo
     */
    const AffectSpecialisation& getAffectSpecialisation() const { return _affectSpecialisation; };
    void setAffectSpecialisation(const AffectSpecialisation& affectSpecialisation)
    {
        _affectSpecialisation = affectSpecialisation;
    };

    /** Todo
     */
    std::string_view getAffectorType() const { return _affectorType; };
    void setAffectorType(std::string_view affectorType) { _affectorType = affectorType; };

    /** Add a ParticleEmitter name that excludes Particles emitted by this ParticleEmitter from being
        affected.
    */
    void addEmitterToExclude(std::string_view emitterName);

    /** Remove a ParticleEmitter name that excludes Particles emitted by this ParticleEmitter.
     */
    void removeEmitterToExclude(std::string_view emitterName);

    /** Todo
     */
    std::string_view getName() const { return _name; };
    void setName(std::string_view name) { _name = name; };

    virtual void copyAttributesTo(PUAffector* affector);

    PUAffector();
    virtual ~PUAffector();

protected:
    float calculateAffectSpecialisationFactor(const PUParticle3D* particle);

protected:
    Vec3 _position;
    /** Although the scale is on a Particle System level, the affector can also be scaled.
     */
    Vec3 _affectorScale;
    /** Because the public attribute position is sometimes used for both localspace and worldspace
    position, the mDerivedPosition attribute is introduced.
*/
    Vec3 _derivedPosition;

    /** The mAffectSpecialisation is used to specialise the affector. This attribute is comparable with the
        mAutoDirection of the ParticleEmitter, it is an optional attribute and used in some of the Particle
        Affectors.
    */
    AffectSpecialisation _affectSpecialisation;

    // Type of the affector
    std::string _affectorType;

    std::vector<std::string> _excludedEmitters;

    // Name of the affector (optional)
    std::string _name;

    float _mass;
};

NS_AX_END

#endif