axmol/core/2d/CCParticleSystem.h

/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011      Zynga Inc.
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
Copyright (c) 2021 Bytedance Inc.

https://adxeproject.github.io/

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****************************************************************************/
#ifndef __CCPARTICLE_SYSTEM_H__
#define __CCPARTICLE_SYSTEM_H__

#include "base/CCProtocols.h"
#include "2d/CCNode.h"
#include "base/CCValue.h"
#include "2d/CCSpriteFrame.h"
#include "2d/CCSpriteFrameCache.h"

NS_CC_BEGIN

/**
 * @addtogroup _2d
 * @{
 */

class ParticleBatchNode;

/** @struct sParticle
Structure that contains the values of each particle.
*/

struct particle_point
{
    float x;
    float y;
};

/** @struct ParticleAnimationDescriptor
Structure that contains animation description
*/
struct ParticleAnimationDescriptor
{
    float                       animationSpeed;
    float                       animationSpeedVariance;
    std::vector<unsigned short> animationIndices;
    bool                        reverseIndices;
};

/** @struct ParticleFrameDescriptor
Structure that contains frame description
*/
struct ParticleFrameDescriptor
{
    cocos2d::Rect rect;
    bool          isRotated;
};

class CC_DLL ParticleData
{
public:
    float* posx;
    float* posy;
    float* startPosX;
    float* startPosY;

    float* colorR;
    float* colorG;
    float* colorB;
    float* colorA;

    float* deltaColorR;
    float* deltaColorG;
    float* deltaColorB;
    float* deltaColorA;

    float* size;
    float* deltaSize;
    float* rotation;
    float* staticRotation;
    float* deltaRotation;
    float* totalTimeToLive;
    float* timeToLive;
    float* animTimeDelta;
    float* animTimeLength;
    unsigned short* animIndex;
    unsigned short* animCellIndex;
    unsigned int* atlasIndex;

    //! Mode A: gravity, direction, radial accel, tangential accel
    struct
    {
        float* dirX;
        float* dirY;
        float* radialAccel;
        float* tangentialAccel;
    } modeA;

    //! Mode B: radius mode
    struct
    {
        float* angle;
        float* degreesPerSecond;
        float* radius;
        float* deltaRadius;
    } modeB;

    unsigned int maxCount;
    ParticleData();
    bool init(int count);
    void release();
    unsigned int getMaxCount() { return maxCount; }

    void copyParticle(int p1, int p2)
    {
        posx[p1]      = posx[p2];
        posy[p1]      = posy[p2];
        startPosX[p1] = startPosX[p2];
        startPosY[p1] = startPosY[p2];

        colorR[p1] = colorR[p2];
        colorG[p1] = colorG[p2];
        colorB[p1] = colorB[p2];
        colorA[p1] = colorA[p2];

        deltaColorR[p1] = deltaColorR[p2];
        deltaColorG[p1] = deltaColorG[p2];
        deltaColorB[p1] = deltaColorB[p2];
        deltaColorA[p1] = deltaColorA[p2];

        size[p1]      = size[p2];
        deltaSize[p1] = deltaSize[p2];

        rotation[p1]      = rotation[p2];
        deltaRotation[p1] = deltaRotation[p2];

        totalTimeToLive[p1] = totalTimeToLive[p2];
        timeToLive[p1] = timeToLive[p2];

        animCellIndex[p1] = animCellIndex[p2];
        atlasIndex[p1] = atlasIndex[p2];

        modeA.dirX[p1]            = modeA.dirX[p2];
        modeA.dirY[p1]            = modeA.dirY[p2];
        modeA.radialAccel[p1]     = modeA.radialAccel[p2];
        modeA.tangentialAccel[p1] = modeA.tangentialAccel[p2];

        modeB.angle[p1]            = modeB.angle[p2];
        modeB.degreesPerSecond[p1] = modeB.degreesPerSecond[p2];
        modeB.radius[p1]           = modeB.radius[p2];
        modeB.deltaRadius[p1]      = modeB.deltaRadius[p2];
    }
};

// typedef void (*CC_UPDATE_PARTICLE_IMP)(id, SEL, tParticle*, Vec2);

class Texture2D;

/** @class ParticleSystem
 * @brief Particle System base class.
Attributes of a Particle System:
- emission rate of the particles
- Gravity Mode (Mode A):
- gravity
- direction
- speed +-  variance
- tangential acceleration +- variance
- radial acceleration +- variance
- Radius Mode (Mode B):
- startRadius +- variance
- endRadius +- variance
- rotate +- variance
- Properties common to all modes:
- life +- life variance
- start spin +- variance
- end spin +- variance
- start size +- variance
- end size +- variance
- start color +- variance
- end color +- variance
- life +- variance
- blending function
- texture

Cocos2d also supports particles generated by Particle Designer (http://particledesigner.71squared.com/).
'Radius Mode' in Particle Designer uses a fixed emit rate of 30 hz. Since that can't be guaranteed in cocos2d,
cocos2d uses a another approach, but the results are almost identical.

Cocos2d supports all the variables used by Particle Designer plus a bit more:
- spinning particles (supported when using ParticleSystemQuad)
- tangential acceleration (Gravity mode)
- radial acceleration (Gravity mode)
- radius direction (Radius mode) (Particle Designer supports outwards to inwards direction only)

It is possible to customize any of the above mentioned properties in runtime. Example:

@code
emitter.radialAccel = 15;
emitter.startSpin = 0;
@endcode

*/

class CC_DLL ParticleSystem : public Node, public TextureProtocol, public PlayableProtocol
{
public:
    /** Mode
     * @js cc.ParticleSystem.MODE_GRAVITY;
     */
    enum class Mode
    {
        GRAVITY,
        RADIUS,
    };

    /** PositionType
     Types of particle positioning.
     * @js cc.ParticleSystem.TYPE_FREE
     */
    enum class PositionType
    {
        FREE, /** Living particles are attached to the world and are unaffected by emitter repositioning. */

        RELATIVE, /** Living particles are attached to the world but will follow the emitter repositioning.
                   Use case: Attach an emitter to an sprite, and you want that the emitter follows the sprite.*/

        GROUPED, /** Living particles are attached to the emitter and are translated along with it. */

    };

   /** TexAnimDir
    Texture animation direction for the particles.
    */
    enum class TexAnimDir
    {
        VERTICAL, /** texture coordinates are read top to bottom within the texture */

        HORIZONTAL, /** texture coordinates are read left to right within the texture */

    };

    //* @enum
    enum
    {
        /** The Particle emitter lives forever. */
        DURATION_INFINITY = -1,

        /** The starting size of the particle is equal to the ending size. */
        START_SIZE_EQUAL_TO_END_SIZE = -1,

        /** The starting radius of the particle is equal to the ending radius. */
        START_RADIUS_EQUAL_TO_END_RADIUS = -1,
    };

    /** Creates an initializes a ParticleSystem from a plist file.
    This plist files can be created manually or with Particle Designer:
    http://particledesigner.71squared.com/
     @since v2.0
     *
     * @param plistFile Particle plist file name.
     * @return An autoreleased ParticleSystem object.
     */
    static ParticleSystem* create(std::string_view plistFile);

    /** Create a system with a fixed number of particles.
     *
     * @param numberOfParticles A given number of particles.
     * @return An autoreleased ParticleSystemQuad object.
     * @js NA
     */
    static ParticleSystem* createWithTotalParticles(int numberOfParticles);

    /** Gets all ParticleSystem references
     */
    static Vector<ParticleSystem*>& getAllParticleSystems();

public:
    void addParticles(int count, int animationCellIndex = -1, int animationIndex = -1);

    void stopSystem();
    /** Kill all living particles.
     */
    void resetSystem();
    /** Whether or not the system is full.
     *
     * @return True if the system is full.
     */
    bool isFull();

    /** Update the verts position data of particle,
     should be overridden by subclasses.
     */
    virtual void updateParticleQuads();
    /** Update the VBO verts buffer which does not use batch node,
     should be overridden by subclasses. */
    virtual void postStep();

    /** Call the update method with no time..
     */
    virtual void updateWithNoTime();

    /** Whether or not the particle system removed self on finish.
     *
     * @return True if the particle system removed self on finish.
     */
    virtual bool isAutoRemoveOnFinish() const;

    /** Set the particle system auto removed it self on finish.
     *
     * @param var True if the particle system removed self on finish.
     */
    virtual void setAutoRemoveOnFinish(bool var);

    // mode A
    /** Gets the gravity.
     *
     * @return The gravity.
     */
    virtual const Vec2& getGravity();
    /** Sets the gravity.
     *
     * @param g The gravity.
     */
    virtual void setGravity(const Vec2& g);
    /** Gets the speed.
     *
     * @return The speed.
     */
    virtual float getSpeed() const;
    /** Sets the speed.
     *
     * @param speed The speed.
     */
    virtual void setSpeed(float speed);
    /** Gets the speed variance.
     *
     * @return The speed variance.
     */
    virtual float getSpeedVar() const;
    /** Sets the speed variance.
     *
     * @param speed The speed variance.
     */
    virtual void setSpeedVar(float speed);
    /** Gets the tangential acceleration.
     *
     * @return The tangential acceleration.
     */
    virtual float getTangentialAccel() const;
    /** Sets the tangential acceleration.
     *
     * @param t The tangential acceleration.
     */
    virtual void setTangentialAccel(float t);
    /** Gets the tangential acceleration variance.
     *
     * @return The tangential acceleration variance.
     */
    virtual float getTangentialAccelVar() const;
    /** Sets the tangential acceleration variance.
     *
     * @param t The tangential acceleration variance.
     */
    virtual void setTangentialAccelVar(float t);
    /** Gets the radial acceleration.
     *
     * @return The radial acceleration.
     */
    virtual float getRadialAccel() const;
    /** Sets the radial acceleration.
     *
     * @param t The radial acceleration.
     */
    virtual void setRadialAccel(float t);
    /** Gets the radial acceleration variance.
     *
     * @return The radial acceleration variance.
     */
    virtual float getRadialAccelVar() const;
    /** Sets the radial acceleration variance.
     *
     * @param t The radial acceleration variance.
     */
    virtual void setRadialAccelVar(float t);
    /** Whether or not the rotation of each particle to its direction.
     *
     * @return True if the rotation is the direction.
     */
    virtual bool getRotationIsDir() const;
    /** Sets the rotation of each particle to its direction.
     *
     * @param t True if the rotation is the direction.
     */
    virtual void setRotationIsDir(bool t);
    // mode B
    /** Gets the start radius.
     *
     * @return The start radius.
     */
    virtual float getStartRadius() const;
    /** Sets the start radius.
     *
     * @param startRadius The start radius.
     */
    virtual void setStartRadius(float startRadius);
    /** Gets the start radius variance.
     *
     * @return The start radius variance.
     */
    virtual float getStartRadiusVar() const;
    /** Sets the start radius variance.
     *
     * @param startRadiusVar The start radius variance.
     */
    virtual void setStartRadiusVar(float startRadiusVar);
    /** Gets the end radius.
     *
     * @return The end radius.
     */
    virtual float getEndRadius() const;
    /** Sets the end radius.
     *
     * @param endRadius The end radius.
     */
    virtual void setEndRadius(float endRadius);
    /** Gets the end radius variance.
     *
     * @return The end radius variance.
     */
    virtual float getEndRadiusVar() const;
    /** Sets the end radius variance.
     *
     * @param endRadiusVar The end radius variance.
     */
    virtual void setEndRadiusVar(float endRadiusVar);
    /** Gets the number of degrees to rotate a particle around the source pos per second.
     *
     * @return The number of degrees to rotate a particle around the source pos per second.
     */
    virtual float getRotatePerSecond() const;
    /** Sets the number of degrees to rotate a particle around the source pos per second.
     *
     * @param degrees The number of degrees to rotate a particle around the source pos per second.
     */
    virtual void setRotatePerSecond(float degrees);
    /** Gets the rotate per second variance.
     *
     * @return The rotate per second variance.
     */
    virtual float getRotatePerSecondVar() const;
    /** Sets the rotate per second variance.
     *
     * @param degrees The rotate per second variance.
     */
    virtual void setRotatePerSecondVar(float degrees);

    virtual void setScale(float s) override;
    virtual void setRotation(float newRotation) override;
    virtual void setScaleX(float newScaleX) override;
    virtual void setScaleY(float newScaleY) override;

    /** Whether or not the particle system is active.
     *
     * @return True if the particle system is active.
     */
    virtual bool isActive() const;
    /** Whether or not the particle system is blend additive.
     *
     * @return True if the particle system is blend additive.
     */
    virtual bool isBlendAdditive() const;
    /** Sets the particle system blend additive.
     *
     * @param value True if the particle system is blend additive.
     */
    virtual void setBlendAdditive(bool value);

    /** Gets the batch node.
     *
     * @return The batch node.
     */
    virtual ParticleBatchNode* getBatchNode() const;
    /** Sets the batch node.
     *
     * @param batchNode The batch node.
     */
    virtual void setBatchNode(ParticleBatchNode* batchNode);

    /** Gets the index of system in batch node array.
     *
     * @return The index of system in batch node array.
     */
    int getAtlasIndex() const { return _atlasIndex; }
    /** Sets the index of system in batch node array.
     *
     * @param index The index of system in batch node array.
     */
    void setAtlasIndex(int index) { _atlasIndex = index; }

    /** Gets the Quantity of particles that are being simulated at the moment.
     *
     * @return The Quantity of particles that are being simulated at the moment.
     */
    unsigned int getParticleCount() const { return _particleCount; }

    /** Gets how many seconds the emitter will run. -1 means 'forever'.
     *
     * @return The seconds that the emitter will run. -1 means 'forever'.
     */
    float getDuration() const { return _duration; }
    /** Sets how many seconds the emitter will run. -1 means 'forever'.
     *
     * @param duration The seconds that the emitter will run. -1 means 'forever'.
     */
    void setDuration(float duration) { _duration = duration; }

    /** Gets the source position of the emitter.
     *
     * @return The source position of the emitter.
     */
    const Vec2& getSourcePosition() const { return _sourcePosition; }
    /** Sets the source position of the emitter.
     *
     * @param pos The source position of the emitter.
     */
    void setSourcePosition(const Vec2& pos) { _sourcePosition = pos; }

    /** Gets the position variance of the emitter.
     *
     * @return The position variance of the emitter.
     */
    const Vec2& getPosVar() const { return _posVar; }
    /** Sets the position variance of the emitter.
     *
     * @param pos The position variance of the emitter.
     */
    void setPosVar(const Vec2& pos) { _posVar = pos; }

    /** Gets the life of each particle.
     *
     * @return The life of each particle.
     */
    float getLife() const { return _life; }
    /** Sets the life of each particle.
     *
     * @param life The life of each particle.
     */
    void setLife(float life) { _life = life; }

    /** Gets the life variance of each particle.
     *
     * @return The life variance of each particle.
     */
    float getLifeVar() const { return _lifeVar; }
    /** Sets the life variance of each particle.
     *
     * @param lifeVar The life variance of each particle.
     */
    void setLifeVar(float lifeVar) { _lifeVar = lifeVar; }

    /** Gets the angle of each particle.
     *
     * @return The angle of each particle.
     */
    float getAngle() const { return _angle; }
    /** Sets the angle of each particle.
     *
     * @param angle The angle of each particle.
     */
    void setAngle(float angle) { _angle = angle; }

    /** Gets the angle variance of each particle.
     *
     * @return The angle variance of each particle.
     */
    float getAngleVar() const { return _angleVar; }
    /** Sets the angle variance of each particle.
     *
     * @param angleVar The angle variance of each particle.
     */
    void setAngleVar(float angleVar) { _angleVar = angleVar; }

    /** Switch between different kind of emitter modes:
     - kParticleModeGravity: uses gravity, speed, radial and tangential acceleration.
     - kParticleModeRadius: uses radius movement + rotation.
     *
     * @return The mode of the emitter.
     */
    Mode getEmitterMode() const { return _emitterMode; }
    /** Sets the mode of the emitter.
     *
     * @param mode The mode of the emitter.
     */
    void setEmitterMode(Mode mode) { _emitterMode = mode; }

    /** Gets the start size in pixels of each particle.
     *
     * @return The start size in pixels of each particle.
     */
    float getStartSize() const { return _startSize; }
    /** Sets the start size in pixels of each particle.
     *
     * @param startSize The start size in pixels of each particle.
     */
    void setStartSize(float startSize) { _startSize = startSize; }

    /** Gets the start size variance in pixels of each particle.
     *
     * @return The start size variance in pixels of each particle.
     */
    float getStartSizeVar() const { return _startSizeVar; }
    /** Sets the start size variance in pixels of each particle.
     *
     * @param sizeVar The start size variance in pixels of each particle.
     */
    void setStartSizeVar(float sizeVar) { _startSizeVar = sizeVar; }

    /** Gets the end size in pixels of each particle.
     *
     * @return The end size in pixels of each particle.
     */
    float getEndSize() const { return _endSize; }
    /** Sets the end size in pixels of each particle.
     *
     * @param endSize The end size in pixels of each particle.
     */
    void setEndSize(float endSize) { _endSize = endSize; }

    /** Gets the end size variance in pixels of each particle.
     *
     * @return The end size variance in pixels of each particle.
     */
    float getEndSizeVar() const { return _endSizeVar; }
    /** Sets the end size variance in pixels of each particle.
     *
     * @param sizeVar The end size variance in pixels of each particle.
     */
    void setEndSizeVar(float sizeVar) { _endSizeVar = sizeVar; }

    /** Gets the start color of each particle.
     *
     * @return The start color of each particle.
     */
    const Color4F& getStartColor() const { return _startColor; }
    /** Sets the start color of each particle.
     *
     * @param color The start color of each particle.
     */
    void setStartColor(const Color4F& color) { _startColor = color; }

    /** Gets the start color variance of each particle.
     *
     * @return The start color variance of each particle.
     */
    const Color4F& getStartColorVar() const { return _startColorVar; }
    /** Sets the start color variance of each particle.
     *
     * @param color The start color variance of each particle.
     */
    void setStartColorVar(const Color4F& color) { _startColorVar = color; }

    /** Gets the end color and end color variation of each particle.
     *
     * @return The end color and end color variation of each particle.
     */
    const Color4F& getEndColor() const { return _endColor; }
    /** Sets the end color and end color variation of each particle.
     *
     * @param color The end color and end color variation of each particle.
     */
    void setEndColor(const Color4F& color) { _endColor = color; }

    /** Gets the end color variance of each particle.
     *
     * @return The end color variance of each particle.
     */
    const Color4F& getEndColorVar() const { return _endColorVar; }
    /** Sets the end color variance of each particle.
     *
     * @param color The end color variance of each particle.
     */
    void setEndColorVar(const Color4F& color) { _endColorVar = color; }

    /** Gets the start spin of each particle.
     *
     * @return The start spin of each particle.
     */
    float getStartSpin() const { return _startSpin; }
    /** Sets the start spin of each particle.
     *
     * @param spin The start spin of each particle.
     */
    void setStartSpin(float spin) { _startSpin = spin; }

    /** Gets the start spin variance of each particle.
     *
     * @return The start spin variance of each particle.
     */
    float getStartSpinVar() const { return _startSpinVar; }
    /** Sets the start spin variance of each particle.
     *
     * @param pinVar The start spin variance of each particle.
     */
    void setStartSpinVar(float pinVar) { _startSpinVar = pinVar; }

    /** Gets the end spin of each particle.
     *
     * @return The end spin of each particle.
     */
    float getEndSpin() const { return _endSpin; }
    /** Sets the end spin of each particle.
     *
     * @param endSpin The end spin of each particle.
     */
    void setEndSpin(float endSpin) { _endSpin = endSpin; }

    /** Gets the end spin variance of each particle.
     *
     * @return The end spin variance of each particle.
     */
    float getEndSpinVar() const { return _endSpinVar; }
    /** Sets the end spin variance of each particle.
     *
     * @param endSpinVar The end spin variance of each particle.
     */
    void setEndSpinVar(float endSpinVar) { _endSpinVar = endSpinVar; }

    /** Sets the static rotation of each particle
     *
     * @param angle The angle in degrees that the particle will exist with
     */
    virtual void setStaticRotation(float angle) { _staticRotation = angle; };
    /** Sets the static rotation variance of each particle.
     *
     * @param angle The angle in degrees variance
     */
    virtual void setStaticRotationVar(float angle) { _staticRotationVar = angle; };

    /** Gets the emission rate of the particles.
     *
     * @return The emission rate of the particles.
     */
    float getEmissionRate() const { return _emissionRate; }
    /** Sets the emission rate of the particles.
     *
     * @param rate The emission rate of the particles.
     */
    void setEmissionRate(float rate) { _emissionRate = rate; }

    /** Gets the maximum particles of the system.
     *
     * @return The maximum particles of the system.
     */
    virtual int getTotalParticles() const;
    /** Sets the maximum particles of the system.
     *
     * @param totalParticles The maximum particles of the system.
     */
    virtual void setTotalParticles(int totalParticles);

    /** does the alpha value modify color */
    void setOpacityModifyRGB(bool opacityModifyRGB) override { _opacityModifyRGB = opacityModifyRGB; }
    bool isOpacityModifyRGB() const override { return _opacityModifyRGB; }

    /** Enables or disables tex coord animations that are set based on particle life. */
    void setLifeAnimation(bool enabled)
    {
        _isLifeAnimated = enabled;
        _isEmitterAnimated = false;
        _isLoopAnimated = false;
    }

    /** Enables or disables tex coord animations that are set by the emitter randomly when a particle is emitted. 
    * WARNING: this won't matter if particle life animation is enabled ie. setLifeAnimation(true) */
    void setEmitterAnimation(bool enabled)
    {
        _isEmitterAnimated = enabled;
        _isLifeAnimated = false;
        _isLoopAnimated = false;
    }

    /** Enables or disables tex coord animations that are used to make particles play a sequence forever until they die
    * This interduces a new concept of animation where you specify the indices and then specify animations descriptors that tell how these indices are used and what speed they're played at.
    * Functions that effect this are: setMultiAnimationParticles(), resetAnimationDescriptors(), resetAnimationIndices(), addAnimationIndex(), setAnimationDescriptor(), setMultiAnimationRandom(), setMultiAnimationRandomSpecific(), 
    */
    void setLoopAnimation(bool enabled)
    {
        _isLoopAnimated = enabled;
        _isEmitterAnimated = false;
        _isLifeAnimated = false;
    }

    bool isLifeAnimated() { return _isLifeAnimated; }
    bool isEmitterAnimated() { return _isEmitterAnimated; }

    /** Sets texture animation direction for the particles */
    void setAnimationTexDir(TexAnimDir dir = TexAnimDir::VERTICAL) { _animDir = dir; }

    /** Gets texture animation direction for the particles */
    TexAnimDir getAnimationTexDir() { return _animDir; }

    /** Sets the width and height of a single animated cell *unified*
    * Example: if a cell's size in the texture is 32 pixels wide and 32 pixel high then the unified size is 32 */
    void setAnimationCellUnifiedSize(int unifiedSizeInPixels) { _animUnifiedSize = unifiedSizeInPixels; }

    /** Gets the width and height of a single animated cell *unified*
     * Example: if a cell's size in the texture is 32 pixels wide and 32 pixel high then the unified size is 32 */
    int getAnimationCellUnifiedSize() { return _animUnifiedSize; }

    /** Gets the total pixels in a texture based on the direction set */
    int getAnimationPixels()
    {
        switch (_animDir)
        {
        case TexAnimDir::VERTICAL:
            return _texture->getPixelsHigh();
        case TexAnimDir::HORIZONTAL:
            return _texture->getPixelsWide();
        default: return 0;
        }
    }

    /** Gets the total cells viewable in a texture by dividing texture height or width into animation cell size
    * animation cell size can be changed using setAnimationCellUnifiedSize(int)
    * incase atlas animation is set off it will return the indices added through addAnimationIndex() */
    int getTotalAnimationCells() {  return _isAnimationAtlas ? getAnimationPixels() / _animUnifiedSize : _animIndexCount; }

    /** Sets wether to start from first cell and go forward (normal)
    * or last cell and go backward (reversed) when using life animation */
    void setLifeAnimationReverse(bool reverse) { _isLifeAnimationReversed = reverse; }
    bool isAnimationLifeReversed() { return _isLifeAnimationReversed; }

    /** Sets wether to use atlas rendering or sprite frame rendering */
    void setAnimationAtlas(bool atlas) { _isAnimationAtlas = atlas; }
    bool isAnimationAtlas() { return _isAnimationAtlas; }

    /** Sets wether to use multiable different index animations that can be randomly choosen for particles */
    void setMultiAnimationParticles(bool multi) { _isAnimationMulti = multi; }
    bool isMultiAnimationParticles() { return _isAnimationMulti; }

    /** Resets the count of indices to 0 and empties the index array */
    void resetAnimationIndices();

    /** Resets the container of animation descriptors empties the random array */
    void resetAnimationDescriptors();

    /** Choose what animation descriptors are to be selected at random for particles
    * This function should be called after you've inserted/overwritten any animation descriptors.
    * 
    * @param animations Array of specific animations to play at random
    */
    void setMultiAnimationRandomSpecific(std::vector<unsigned short> animations) { _randomAnimations = animations; };

    /** Choose ALL animation descriptors to be selected at random for particles.
    * This function should be called after you've inserted/overwritten any animation descriptors.
    */
    void setMultiAnimationRandom();

    /** Add a particle animation index based on tex coords spicified using a sprite frame if atlas mode is off.
     * The index is automatically incremented on each addition.
     *
     * @param frameName SpriteFrame name to search for
     */
    void addAnimationIndex(std::string_view frameName);

    /** Add a particle animation index based on tex coords spicified using a sprite frame if atlas mode is off.
     *
     * @param frameName SpriteFrame name to search for
     */
    void addAnimationIndex(unsigned short index, std::string_view frameName);

    /** Add a particle animation index based on tex coords spicified using a sprite frame if atlas mode is off.
     * The index is automatically incremented on each addition.
     * 
     * @param frame SpriteFrame containting data about tex coords
     */
    void addAnimationIndex(cocos2d::SpriteFrame* frame);

    /** Add a particle animation index based on tex coords spicified using a sprite frame if atlas mode is off.
     * you can specify which index you want to override in this function
     * @param index Index id to override the index with
     * @param frame SpriteFrame containting data about tex coords
     */
    void addAnimationIndex(unsigned short index, cocos2d::SpriteFrame* frame);

    /** Add a particle animation descriptor with an index.
    *
    * @param indexOfDescriptor Index of the animation to be added, adding to the same index will just override the pervious animation descriptor
    * @param time length of the animation in seconds
    * @param timeVariance Time randomly selected for each different particle added on the animation length
    * @param indices An array of the indicies
    * @param reverse Should the animation indicies be played backwards? (default: false)
    */
    void setAnimationDescriptor(unsigned short indexOfDescriptor,
                                float time,
                                float timeVariance,
                                std::vector<unsigned short> indices,
                                bool reverse = false);

    /** Gets the particles movement type: Free or Grouped.
     @since v0.8
     *
     * @return The particles movement type.
     */
    PositionType getPositionType() const { return _positionType; }
    /** Sets the particles movement type: Free or Grouped.
    @since v0.8
     *
     * @param type The particles movement type.
     */
    void setPositionType(PositionType type) { _positionType = type; }

    // Overrides
    virtual void onEnter() override;
    virtual void onExit() override;
    virtual void update(float dt) override;
    virtual Texture2D* getTexture() const override;
    virtual void setTexture(Texture2D* texture) override;
    /**
     *@code
     *When this function bound into js or lua,the parameter will be changed
     *In js: var setBlendFunc(var src, var dst)
     *In lua: local setBlendFunc(local src, local dst)
     *@endcode
     */
    virtual void setBlendFunc(const BlendFunc& blendFunc) override;
    /**
     * @js NA
     * @lua NA
     */
    virtual const BlendFunc& getBlendFunc() const override;

    std::string_view getResourceFile() const { return _plistFile; }

    /// @{
    /// @name implement Playable Protocol
    virtual void start() override;
    virtual void stop() override;
    /// @} end of PlayableProtocol

    void setSourcePositionCompatible(bool sourcePositionCompatible)
    {
        _sourcePositionCompatible = sourcePositionCompatible;
    }
    bool isSourcePositionCompatible() const { return _sourcePositionCompatible; }

    /**
     * @js ctor
     */
    ParticleSystem();
    /**
     * @js NA
     * @lua NA
     */
    virtual ~ParticleSystem();

    /** initializes a ParticleSystem*/
    bool init() override;
    /** initializes a ParticleSystem from a plist file.
     This plist files can be created manually or with Particle Designer:
     http://particledesigner.71squared.com/
     @since v0.99.3
     */
    bool initWithFile(std::string_view plistFile);

    /** initializes a QuadParticleSystem from a Dictionary.
     @since v0.99.3
     */
    bool initWithDictionary(const ValueMap& dictionary);

    /** initializes a particle system from a NSDictionary and the path from where to load the png
     @since v2.1
     */
    bool initWithDictionary(const ValueMap& dictionary, std::string_view dirname);

    //! Initializes a system with a fixed number of particles
    virtual bool initWithTotalParticles(int numberOfParticles);

    /** Are the emissions paused
     @return True if the emissions are paused, else false
     */
    virtual bool isPaused() const;

    /* Pause the emissions*/
    virtual void pauseEmissions();

    /* UnPause the emissions*/
    virtual void resumeEmissions();

protected:
    virtual void updateBlendFunc();

private:
    friend class EngineDataManager;
    /** Internal use only, it's used by EngineDataManager class for Android platform */
    static void setTotalParticleCountFactor(float factor);

protected:
    /** whether or not the particles are using blend additive.
     If enabled, the following blending function will be used.
     @code
     source blend function = BlendFactor::SRC_ALPHA;
     dest blend function = BlendFactor::ONE;
     @endcode
     */
    bool _isBlendAdditive;

    /** whether or not the node will be auto-removed when it has no particles left.
     By default it is false.
     @since v0.8
     */
    bool _isAutoRemoveOnFinish;

    std::string _plistFile;
    //! time elapsed since the start of the system (in seconds)
    float _elapsed;

    // Different modes
    //! Mode A:Gravity + Tangential Accel + Radial Accel
    struct
    {
        /** Gravity value. Only available in 'Gravity' mode. */
        Vec2 gravity;
        /** speed of each particle. Only available in 'Gravity' mode.  */
        float speed;
        /** speed variance of each particle. Only available in 'Gravity' mode. */
        float speedVar;
        /** tangential acceleration of each particle. Only available in 'Gravity' mode. */
        float tangentialAccel;
        /** tangential acceleration variance of each particle. Only available in 'Gravity' mode. */
        float tangentialAccelVar;
        /** radial acceleration of each particle. Only available in 'Gravity' mode. */
        float radialAccel;
        /** radial acceleration variance of each particle. Only available in 'Gravity' mode. */
        float radialAccelVar;
        /** set the rotation of each particle to its direction Only available in 'Gravity' mode. */
        bool rotationIsDir;
    } modeA;

    //! Mode B: circular movement (gravity, radial accel and tangential accel don't are not used in this mode)
    struct
    {
        /** The starting radius of the particles. Only available in 'Radius' mode. */
        float startRadius;
        /** The starting radius variance of the particles. Only available in 'Radius' mode. */
        float startRadiusVar;
        /** The ending radius of the particles. Only available in 'Radius' mode. */
        float endRadius;
        /** The ending radius variance of the particles. Only available in 'Radius' mode. */
        float endRadiusVar;
        /** Number of degrees to rotate a particle around the source pos per second. Only available in 'Radius' mode. */
        float rotatePerSecond;
        /** Variance in degrees for rotatePerSecond. Only available in 'Radius' mode. */
        float rotatePerSecondVar;
    } modeB;

    // particle data
    ParticleData _particleData;

    // Emitter name
    std::string _configName;

    // color modulate
    //    BOOL colorModulate;

    //! How many particles can be emitted per second
    float _emitCounter;

    // Optimization
    // CC_UPDATE_PARTICLE_IMP    updateParticleImp;
    // SEL                        updateParticleSel;

    /** weak reference to the SpriteBatchNode that renders the Sprite */
    ParticleBatchNode* _batchNode;

    // index of system in batch node array
    int _atlasIndex;

    // true if scaled or rotated
    bool _transformSystemDirty;
    // Number of allocated particles
    int _allocatedParticles;

    /** Is the emitter active */
    bool _isActive;

    /** Quantity of particles that are being simulated at the moment */
    int _particleCount;
    /** The factor affects the total particle count, its value should be 0.0f ~ 1.0f, default 1.0f*/
    static float __totalParticleCountFactor;

    /** How many seconds the emitter will run. -1 means 'forever' */
    float _duration;
    /** sourcePosition of the emitter */
    Vec2 _sourcePosition;
    /** Position variance of the emitter */
    Vec2 _posVar;
    /** life, and life variation of each particle */
    float _life;
    /** life variance of each particle */
    float _lifeVar;
    /** angle and angle variation of each particle */
    float _angle;
    /** angle variance of each particle */
    float _angleVar;

    /** Switch between different kind of emitter modes:
     - kParticleModeGravity: uses gravity, speed, radial and tangential acceleration
     - kParticleModeRadius: uses radius movement + rotation
     */
    Mode _emitterMode;

    /** start size in pixels of each particle */
    float _startSize;
    /** size variance in pixels of each particle */
    float _startSizeVar;
    /** end size in pixels of each particle */
    float _endSize;
    /** end size variance in pixels of each particle */
    float _endSizeVar;
    /** start color of each particle */
    Color4F _startColor;
    /** start color variance of each particle */
    Color4F _startColorVar;
    /** end color and end color variation of each particle */
    Color4F _endColor;
    /** end color variance of each particle */
    Color4F _endColorVar;
    //* initial angle of each particle
    float _startSpin;
    //* initial angle of each particle
    float _startSpinVar;
    //* initial angle of each particle
    float _endSpin;
    //* initial angle of each particle
    float _endSpinVar;
    //* initial rotation of each particle
    float _staticRotation;
    //* initial rotation of each particle
    float _staticRotationVar;
    /** emission rate of the particles */
    float _emissionRate;
    /** maximum particles of the system */
    int _totalParticles;
    /** conforms to CocosNodeTexture protocol */
    Texture2D* _texture;
    /** conforms to CocosNodeTexture protocol */
    BlendFunc _blendFunc;
    /** does the alpha value modify color */
    bool _opacityModifyRGB;
    /** is the particle system animated */
    bool _isLifeAnimated;
    /** is the emitter particle system animated */
    bool _isEmitterAnimated;
    /** is the emitter particle system animated */
    bool _isLoopAnimated;
    /** True if you want to use an atlas with a fixed cell size
    * False if you want to use SpriteFrames as your indexes using the function addAnimationIndex() */
    bool _isAnimationAtlas;
    /** tex coord animation direction for the system */
    TexAnimDir _animDir;
    /** the width and height of an animated cell unified */
    int _animUnifiedSize;
    /** variable keeping count of sprite frames added for atlas mode off */
    int _animIndexCount;
    /** wether to start from first or last when using life animation */
    bool _isLifeAnimationReversed;
    /** A map that stores particle animation index coords */
    std::unordered_map<unsigned short, ParticleFrameDescriptor> _animationIndices;
    /** wether to start from first or last when using life animation */
    int _isAnimationMulti;
    /** A map that stores particle animation descriptors */
    std::unordered_map<unsigned short, ParticleAnimationDescriptor> _animations;
    /** A vector that stores ids of animation descriptors that are choosen at random */
    std::vector<unsigned short> _randomAnimations;
    /** does FlippedY variance of each particle */
    int _yCoordFlipped;

    /** particles movement type: Free or Grouped
     @since v0.8
     */
    PositionType _positionType;

    /** is the emitter paused */
    bool _paused;

    /** is sourcePosition compatible */
    bool _sourcePositionCompatible;

    static Vector<ParticleSystem*> __allInstances;

private:
    CC_DISALLOW_COPY_AND_ASSIGN(ParticleSystem);
};

// end of _2d group
/// @}

NS_CC_END

#endif  //__CCPARTICLE_SYSTEM_H__