axmol/cocos/2d/CCParticleSystem.cpp

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2011      Zynga Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

// ideas taken from:
//     . The ocean spray in your face [Jeff Lander]
//        http://www.double.co.nz/dust/col0798.pdf
//     . Building an Advanced Particle System [John van der Burg]
//        http://www.gamasutra.com/features/20000623/vanderburg_01.htm
//   . LOVE game engine
//        http://love2d.org/
//
//
// Radius mode support, from 71 squared
//        http://particledesigner.71squared.com/
//
// IMPORTANT: Particle Designer is supported by cocos2d, but
// '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. 
//

#include "CCParticleSystem.h"

#include <string>

#include "CCParticleBatchNode.h"
#include "ccTypes.h"
#include "CCTextureCache.h"
#include "CCTextureAtlas.h"
#include "base64.h"
#include "platform/CCFileUtils.h"
#include "platform/CCImage.h"
#include "ZipUtils.h"
#include "CCDirector.h"
#include "CCProfiling.h"
// opengl
#include "CCGL.h"

using namespace std;


NS_CC_BEGIN

// ideas taken from:
//     . The ocean spray in your face [Jeff Lander]
//        http://www.double.co.nz/dust/col0798.pdf
//     . Building an Advanced Particle System [John van der Burg]
//        http://www.gamasutra.com/features/20000623/vanderburg_01.htm
//   . LOVE game engine
//        http://love2d.org/
//
//
// Radius mode support, from 71 squared
//        http://particledesigner.71squared.com/
//
// IMPORTANT: Particle Designer is supported by cocos2d, but
// '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. 
//

ParticleSystem::ParticleSystem()
: _isBlendAdditive(false)
, _isAutoRemoveOnFinish(false)
, _plistFile("")
, _elapsed(0)
, _particles(nullptr)
, _configName("")
, _emitCounter(0)
, _particleIdx(0)
, _batchNode(nullptr)
, _atlasIndex(0)
, _transformSystemDirty(false)
, _allocatedParticles(0)
, _isActive(true)
, _particleCount(0)
, _duration(0)
, _sourcePosition(Point::ZERO)
, _posVar(Point::ZERO)
, _life(0)
, _lifeVar(0)
, _angle(0)
, _angleVar(0)
, _emitterMode(Mode::GRAVITY)
, _startSize(0)
, _startSizeVar(0)
, _endSize(0)
, _endSizeVar(0)
, _startSpin(0)
, _startSpinVar(0)
, _endSpin(0)
, _endSpinVar(0)
, _emissionRate(0)
, _totalParticles(0)
, _texture(nullptr)
, _blendFunc(BlendFunc::ALPHA_PREMULTIPLIED)
, _opacityModifyRGB(false)
, _yCoordFlipped(0)
, _positionType(PositionType::FREE)
{
    modeA.gravity = Point::ZERO;
    modeA.speed = 0;
    modeA.speedVar = 0;
    modeA.tangentialAccel = 0;
    modeA.tangentialAccelVar = 0;
    modeA.radialAccel = 0;
    modeA.radialAccelVar = 0;
    modeA.rotationIsDir = false;
    modeB.startRadius = 0;
    modeB.startRadiusVar = 0;
    modeB.endRadius = 0;
    modeB.endRadiusVar = 0;            
    modeB.rotatePerSecond = 0;
    modeB.rotatePerSecondVar = 0;
}
// implementation ParticleSystem

ParticleSystem * ParticleSystem::create(const std::string& plistFile)
{
    ParticleSystem *pRet = new ParticleSystem();
    if (pRet && pRet->initWithFile(plistFile))
    {
        pRet->autorelease();
        return pRet;
    }
    CC_SAFE_DELETE(pRet);
    return pRet;
}

ParticleSystem* ParticleSystem::createWithTotalParticles(unsigned int numberOfParticles)
{
    ParticleSystem *pRet = new ParticleSystem();
    if (pRet && pRet->initWithTotalParticles(numberOfParticles))
    {
        pRet->autorelease();
        return pRet;
    }
    CC_SAFE_DELETE(pRet);
    return pRet;
}

bool ParticleSystem::init()
{
    return initWithTotalParticles(150);
}

bool ParticleSystem::initWithFile(const std::string& plistFile)
{
    bool bRet = false;
    _plistFile = FileUtils::getInstance()->fullPathForFilename(plistFile);
    Dictionary *dict = Dictionary::createWithContentsOfFileThreadSafe(_plistFile.c_str());

    CCASSERT( dict != NULL, "Particles: file not found");
    
    // XXX compute path from a path, should define a function somewhere to do it
    string listFilePath = plistFile;
    if (listFilePath.find('/') != string::npos)
    {
        listFilePath = listFilePath.substr(0, listFilePath.rfind('/') + 1);
        bRet = this->initWithDictionary(dict, listFilePath.c_str());
    }
    else
    {
        bRet = this->initWithDictionary(dict, "");
    }
    
    dict->release();

    return bRet;
}

bool ParticleSystem::initWithDictionary(Dictionary *dictionary)
{
    return initWithDictionary(dictionary, "");
}

bool ParticleSystem::initWithDictionary(Dictionary *dictionary, const std::string& dirname)
{
    bool bRet = false;
    unsigned char *buffer = NULL;
    unsigned char *deflated = NULL;
    Image *image = NULL;
    do 
    {
        int maxParticles = dictionary->valueForKey("maxParticles")->intValue();
        // self, not super
        if(this->initWithTotalParticles(maxParticles))
        {
            // Emitter name in particle designer 2.0
            const String * configNameConstStr = dictionary->valueForKey("configName");
            _configName = configNameConstStr->getCString();

            // angle
            _angle = dictionary->valueForKey("angle")->floatValue();
            _angleVar = dictionary->valueForKey("angleVariance")->floatValue();

            // duration
            _duration = dictionary->valueForKey("duration")->floatValue();

            // blend function 
            if (_configName.length()>0)
            {
                _blendFunc.src = dictionary->valueForKey("blendFuncSource")->floatValue();
            }
            else
            {
                _blendFunc.src = dictionary->valueForKey("blendFuncSource")->intValue();
            }
            _blendFunc.dst = dictionary->valueForKey("blendFuncDestination")->intValue();

            // color
            _startColor.r = dictionary->valueForKey("startColorRed")->floatValue();
            _startColor.g = dictionary->valueForKey("startColorGreen")->floatValue();
            _startColor.b = dictionary->valueForKey("startColorBlue")->floatValue();
            _startColor.a = dictionary->valueForKey("startColorAlpha")->floatValue();

            _startColorVar.r = dictionary->valueForKey("startColorVarianceRed")->floatValue();
            _startColorVar.g = dictionary->valueForKey("startColorVarianceGreen")->floatValue();
            _startColorVar.b = dictionary->valueForKey("startColorVarianceBlue")->floatValue();
            _startColorVar.a = dictionary->valueForKey("startColorVarianceAlpha")->floatValue();

            _endColor.r = dictionary->valueForKey("finishColorRed")->floatValue();
            _endColor.g = dictionary->valueForKey("finishColorGreen")->floatValue();
            _endColor.b = dictionary->valueForKey("finishColorBlue")->floatValue();
            _endColor.a = dictionary->valueForKey("finishColorAlpha")->floatValue();

            _endColorVar.r = dictionary->valueForKey("finishColorVarianceRed")->floatValue();
            _endColorVar.g = dictionary->valueForKey("finishColorVarianceGreen")->floatValue();
            _endColorVar.b = dictionary->valueForKey("finishColorVarianceBlue")->floatValue();
            _endColorVar.a = dictionary->valueForKey("finishColorVarianceAlpha")->floatValue();

            // particle size
            _startSize = dictionary->valueForKey("startParticleSize")->floatValue();
            _startSizeVar = dictionary->valueForKey("startParticleSizeVariance")->floatValue();
            _endSize = dictionary->valueForKey("finishParticleSize")->floatValue();
            _endSizeVar = dictionary->valueForKey("finishParticleSizeVariance")->floatValue();

            // position
            float x = dictionary->valueForKey("sourcePositionx")->floatValue();
            float y = dictionary->valueForKey("sourcePositiony")->floatValue();
            this->setPosition( Point(x,y) );            
            _posVar.x = dictionary->valueForKey("sourcePositionVariancex")->floatValue();
            _posVar.y = dictionary->valueForKey("sourcePositionVariancey")->floatValue();

            // Spinning
            _startSpin = dictionary->valueForKey("rotationStart")->floatValue();
            _startSpinVar = dictionary->valueForKey("rotationStartVariance")->floatValue();
            _endSpin= dictionary->valueForKey("rotationEnd")->floatValue();
            _endSpinVar= dictionary->valueForKey("rotationEndVariance")->floatValue();

            _emitterMode = (Mode) dictionary->valueForKey("emitterType")->intValue();

            // Mode A: Gravity + tangential accel + radial accel
            if (_emitterMode == Mode::GRAVITY)
            {
                // gravity
                modeA.gravity.x = dictionary->valueForKey("gravityx")->floatValue();
                modeA.gravity.y = dictionary->valueForKey("gravityy")->floatValue();

                // speed
                modeA.speed = dictionary->valueForKey("speed")->floatValue();
                modeA.speedVar = dictionary->valueForKey("speedVariance")->floatValue();

                // radial acceleration
                modeA.radialAccel = dictionary->valueForKey("radialAcceleration")->floatValue();
                modeA.radialAccelVar = dictionary->valueForKey("radialAccelVariance")->floatValue();

                // tangential acceleration
                modeA.tangentialAccel = dictionary->valueForKey("tangentialAcceleration")->floatValue();
                modeA.tangentialAccelVar = dictionary->valueForKey("tangentialAccelVariance")->floatValue();
                
                // rotation is dir
                modeA.rotationIsDir = dictionary->valueForKey("rotationIsDir")->boolValue();
            }

            // or Mode B: radius movement
            else if (_emitterMode == Mode::RADIUS)
            {
                if (_configName.length()>0)
                {
                    modeB.startRadius = dictionary->valueForKey("maxRadius")->intValue();
                }
                else
                {
                    modeB.startRadius = dictionary->valueForKey("maxRadius")->floatValue();
                }
                modeB.startRadiusVar = dictionary->valueForKey("maxRadiusVariance")->floatValue();
                if (_configName.length()>0)
                {
                    modeB.endRadius = dictionary->valueForKey("minRadius")->intValue();
                }
                else
                {
                    modeB.endRadius = dictionary->valueForKey("minRadius")->floatValue();
                }
                modeB.endRadiusVar = 0.0f;
               if (_configName.length()>0)
                {
                    modeB.rotatePerSecond = dictionary->valueForKey("rotatePerSecond")->intValue();
                }
                else
                {
                    modeB.rotatePerSecond = dictionary->valueForKey("rotatePerSecond")->floatValue();
                }
                modeB.rotatePerSecondVar = dictionary->valueForKey("rotatePerSecondVariance")->floatValue();

            } else {
                CCASSERT( false, "Invalid emitterType in config file");
                CC_BREAK_IF(true);
            }

            // life span
            _life = dictionary->valueForKey("particleLifespan")->floatValue();
            _lifeVar = dictionary->valueForKey("particleLifespanVariance")->floatValue();

            // emission Rate
            _emissionRate = _totalParticles / _life;

            //don't get the internal texture if a batchNode is used
            if (!_batchNode)
            {
                // Set a compatible default for the alpha transfer
                _opacityModifyRGB = false;

                // texture        
                // Try to get the texture from the cache
                std::string textureName = dictionary->valueForKey("textureFileName")->getCString();
                
                size_t rPos = textureName.rfind('/');
               
                if (rPos != string::npos)
                {
                    string textureDir = textureName.substr(0, rPos + 1);
                    
                    if (dirname.size()>0 && textureDir != dirname)
                    {
                        textureName = textureName.substr(rPos+1);
                        textureName = dirname + textureName;
                    }
                }
                else
                {
                    if (dirname.size()>0)
                    {
                        textureName = dirname + textureName;
                    }
                }
                
                Texture2D *tex = NULL;
                
                if (textureName.length() > 0)
                {
                    // set not pop-up message box when load image failed
                    bool bNotify = FileUtils::getInstance()->isPopupNotify();
                    FileUtils::getInstance()->setPopupNotify(false);
                    tex = Director::getInstance()->getTextureCache()->addImage(textureName.c_str());
                    // reset the value of UIImage notify
                    FileUtils::getInstance()->setPopupNotify(bNotify);
                }
                
                if (tex)
                {
                    setTexture(tex);
                }
                else
                {                        
                    const char *textureData = dictionary->valueForKey("textureImageData")->getCString();
                    CCASSERT(textureData, "");
                    
                    long dataLen = strlen(textureData);
                    if(dataLen != 0)
                    {
                        // if it fails, try to get it from the base64-gzipped data    
                        int decodeLen = base64Decode((unsigned char*)textureData, (unsigned int)dataLen, &buffer);
                        CCASSERT( buffer != NULL, "CCParticleSystem: error decoding textureImageData");
                        CC_BREAK_IF(!buffer);
                        
                        int deflatedLen = ZipUtils::inflateMemory(buffer, decodeLen, &deflated);
                        CCASSERT( deflated != NULL, "CCParticleSystem: error ungzipping textureImageData");
                        CC_BREAK_IF(!deflated);
                        
                        // For android, we should retain it in VolatileTexture::addImage which invoked in Director::getInstance()->getTextureCache()->addUIImage()
                        image = new Image();
                        bool isOK = image->initWithImageData(deflated, deflatedLen);
                        CCASSERT(isOK, "CCParticleSystem: error init image with Data");
                        CC_BREAK_IF(!isOK);
                        
                        setTexture(Director::getInstance()->getTextureCache()->addImage(image, textureName.c_str()));

                        image->release();
                    }
                }
                if (_configName.length()>0)
                {
                  _yCoordFlipped = dictionary->valueForKey("yCoordFlipped")->intValue();
                }
                CCASSERT( this->_texture != NULL, "CCParticleSystem: error loading the texture");
            }
            bRet = true;
        }
    } while (0);
    free(buffer);
    free(deflated);
    return bRet;
}

bool ParticleSystem::initWithTotalParticles(unsigned int numberOfParticles)
{
    _totalParticles = numberOfParticles;

    CC_SAFE_FREE(_particles);
    
    _particles = (tParticle*)calloc(_totalParticles, sizeof(tParticle));

    if( ! _particles )
    {
        CCLOG("Particle system: not enough memory");
        this->release();
        return false;
    }
    _allocatedParticles = numberOfParticles;

    if (_batchNode)
    {
        for (int i = 0; i < _totalParticles; i++)
        {
            _particles[i].atlasIndex=i;
        }
    }
    // default, active
    _isActive = true;

    // default blend function
    _blendFunc = BlendFunc::ALPHA_PREMULTIPLIED;

    // default movement type;
    _positionType = PositionType::FREE;

    // by default be in mode A:
    _emitterMode = Mode::GRAVITY;

    // default: modulate
    // XXX: not used
    //    colorModulate = YES;

    _isAutoRemoveOnFinish = false;

    // Optimization: compile updateParticle method
    //updateParticleSel = @selector(updateQuadWithParticle:newPosition:);
    //updateParticleImp = (CC_UPDATE_PARTICLE_IMP) [self methodForSelector:updateParticleSel];
    //for batchNode
    _transformSystemDirty = false;
    // update after action in run!
    this->scheduleUpdateWithPriority(1);

    return true;
}

ParticleSystem::~ParticleSystem()
{
    // Since the scheduler retains the "target (in this case the ParticleSystem)
	// it is not needed to call "unscheduleUpdate" here. In fact, it will be called in "cleanup"
    //unscheduleUpdate();
    CC_SAFE_FREE(_particles);
    CC_SAFE_RELEASE(_texture);
}

bool ParticleSystem::addParticle()
{
    if (this->isFull())
    {
        return false;
    }

    tParticle * particle = &_particles[ _particleCount ];
    this->initParticle(particle);
    ++_particleCount;

    return true;
}

void ParticleSystem::initParticle(tParticle* particle)
{
    // timeToLive
    // no negative life. prevent division by 0
    particle->timeToLive = _life + _lifeVar * CCRANDOM_MINUS1_1();
    particle->timeToLive = MAX(0, particle->timeToLive);

    // position
    particle->pos.x = _sourcePosition.x + _posVar.x * CCRANDOM_MINUS1_1();

    particle->pos.y = _sourcePosition.y + _posVar.y * CCRANDOM_MINUS1_1();


    // Color
    Color4F start;
    start.r = clampf(_startColor.r + _startColorVar.r * CCRANDOM_MINUS1_1(), 0, 1);
    start.g = clampf(_startColor.g + _startColorVar.g * CCRANDOM_MINUS1_1(), 0, 1);
    start.b = clampf(_startColor.b + _startColorVar.b * CCRANDOM_MINUS1_1(), 0, 1);
    start.a = clampf(_startColor.a + _startColorVar.a * CCRANDOM_MINUS1_1(), 0, 1);

    Color4F end;
    end.r = clampf(_endColor.r + _endColorVar.r * CCRANDOM_MINUS1_1(), 0, 1);
    end.g = clampf(_endColor.g + _endColorVar.g * CCRANDOM_MINUS1_1(), 0, 1);
    end.b = clampf(_endColor.b + _endColorVar.b * CCRANDOM_MINUS1_1(), 0, 1);
    end.a = clampf(_endColor.a + _endColorVar.a * CCRANDOM_MINUS1_1(), 0, 1);

    particle->color = start;
    particle->deltaColor.r = (end.r - start.r) / particle->timeToLive;
    particle->deltaColor.g = (end.g - start.g) / particle->timeToLive;
    particle->deltaColor.b = (end.b - start.b) / particle->timeToLive;
    particle->deltaColor.a = (end.a - start.a) / particle->timeToLive;

    // size
    float startS = _startSize + _startSizeVar * CCRANDOM_MINUS1_1();
    startS = MAX(0, startS); // No negative value

    particle->size = startS;

    if (_endSize == START_SIZE_EQUAL_TO_END_SIZE)
    {
        particle->deltaSize = 0;
    }
    else
    {
        float endS = _endSize + _endSizeVar * CCRANDOM_MINUS1_1();
        endS = MAX(0, endS); // No negative values
        particle->deltaSize = (endS - startS) / particle->timeToLive;
    }

    // rotation
    float startA = _startSpin + _startSpinVar * CCRANDOM_MINUS1_1();
    float endA = _endSpin + _endSpinVar * CCRANDOM_MINUS1_1();
    particle->rotation = startA;
    particle->deltaRotation = (endA - startA) / particle->timeToLive;

    // position
    if (_positionType == PositionType::FREE)
    {
        particle->startPos = this->convertToWorldSpace(Point::ZERO);
    }
    else if (_positionType == PositionType::RELATIVE)
    {
        particle->startPos = _position;
    }

    // direction
    float a = CC_DEGREES_TO_RADIANS( _angle + _angleVar * CCRANDOM_MINUS1_1() );    

    // Mode Gravity: A
    if (_emitterMode == Mode::GRAVITY)
    {
        Point v(cosf( a ), sinf( a ));
        float s = modeA.speed + modeA.speedVar * CCRANDOM_MINUS1_1();

        // direction
        particle->modeA.dir = v * s ;

        // radial accel
        particle->modeA.radialAccel = modeA.radialAccel + modeA.radialAccelVar * CCRANDOM_MINUS1_1();
 

        // tangential accel
        particle->modeA.tangentialAccel = modeA.tangentialAccel + modeA.tangentialAccelVar * CCRANDOM_MINUS1_1();

        // rotation is dir
        if(modeA.rotationIsDir)
            particle->rotation = -CC_RADIANS_TO_DEGREES(particle->modeA.dir.getAngle());
    }

    // Mode Radius: B
    else 
    {
        // Set the default diameter of the particle from the source position
        float startRadius = modeB.startRadius + modeB.startRadiusVar * CCRANDOM_MINUS1_1();
        float endRadius = modeB.endRadius + modeB.endRadiusVar * CCRANDOM_MINUS1_1();

        particle->modeB.radius = startRadius;

        if (modeB.endRadius == START_RADIUS_EQUAL_TO_END_RADIUS)
        {
            particle->modeB.deltaRadius = 0;
        }
        else
        {
            particle->modeB.deltaRadius = (endRadius - startRadius) / particle->timeToLive;
        }

        particle->modeB.angle = a;
        particle->modeB.degreesPerSecond = CC_DEGREES_TO_RADIANS(modeB.rotatePerSecond + modeB.rotatePerSecondVar * CCRANDOM_MINUS1_1());
    }    
}

void ParticleSystem::stopSystem()
{
    _isActive = false;
    _elapsed = _duration;
    _emitCounter = 0;
}

void ParticleSystem::resetSystem()
{
    _isActive = true;
    _elapsed = 0;
    for (_particleIdx = 0; _particleIdx < _particleCount; ++_particleIdx)
    {
        tParticle *p = &_particles[_particleIdx];
        p->timeToLive = 0;
    }
}
bool ParticleSystem::isFull()
{
    return (_particleCount == _totalParticles);
}

// ParticleSystem - MainLoop
void ParticleSystem::update(float dt)
{
    CC_PROFILER_START_CATEGORY(kProfilerCategoryParticles , "CCParticleSystem - update");

    if (_isActive && _emissionRate)
    {
        float rate = 1.0f / _emissionRate;
        //issue #1201, prevent bursts of particles, due to too high emitCounter
        if (_particleCount < _totalParticles)
        {
            _emitCounter += dt;
        }
        
        while (_particleCount < _totalParticles && _emitCounter > rate) 
        {
            this->addParticle();
            _emitCounter -= rate;
        }

        _elapsed += dt;
        if (_duration != -1 && _duration < _elapsed)
        {
            this->stopSystem();
        }
    }

    _particleIdx = 0;

    Point currentPosition = Point::ZERO;
    if (_positionType == PositionType::FREE)
    {
        currentPosition = this->convertToWorldSpace(Point::ZERO);
    }
    else if (_positionType == PositionType::RELATIVE)
    {
        currentPosition = _position;
    }

    if (_visible)
    {
        while (_particleIdx < _particleCount)
        {
            tParticle *p = &_particles[_particleIdx];

            // life
            p->timeToLive -= dt;

            if (p->timeToLive > 0) 
            {
                // Mode A: gravity, direction, tangential accel & radial accel
                if (_emitterMode == Mode::GRAVITY)
                {
                    Point tmp, radial, tangential;

                    radial = Point::ZERO;
                    // radial acceleration
                    if (p->pos.x || p->pos.y)
                    {
                        radial = p->pos.normalize();
                    }
                    tangential = radial;
                    radial = radial * p->modeA.radialAccel;

                    // tangential acceleration
                    float newy = tangential.x;
                    tangential.x = -tangential.y;
                    tangential.y = newy;
                    tangential = tangential * p->modeA.tangentialAccel;

                    // (gravity + radial + tangential) * dt
                    tmp = radial + tangential + modeA.gravity;
                    tmp = tmp * dt;
                    p->modeA.dir = p->modeA.dir + tmp;
					if (_configName.length()>0)
					{
						if (_yCoordFlipped == -1)
						{
							 tmp = p->modeA.dir * dt;
						}
						else
						{
							 tmp = p->modeA.dir * -dt;
						}
					}
					else
					{
						 tmp = p->modeA.dir * dt;
					}
                    p->pos = p->pos + tmp;
                }

                // Mode B: radius movement
                else 
                {                
                    // Update the angle and radius of the particle.
                    p->modeB.angle += p->modeB.degreesPerSecond * dt;
                    p->modeB.radius += p->modeB.deltaRadius * dt;

                    p->pos.x = - cosf(p->modeB.angle) * p->modeB.radius;
                    p->pos.y = - sinf(p->modeB.angle) * p->modeB.radius;
                    if (_yCoordFlipped == 1)
                    {
                      p->pos.y = -p->pos.y;
                    }
				}

                // color
                p->color.r += (p->deltaColor.r * dt);
                p->color.g += (p->deltaColor.g * dt);
                p->color.b += (p->deltaColor.b * dt);
                p->color.a += (p->deltaColor.a * dt);

                // size
                p->size += (p->deltaSize * dt);
                p->size = MAX( 0, p->size );

                // angle
                p->rotation += (p->deltaRotation * dt);

                //
                // update values in quad
                //

                Point    newPos;

                if (_positionType == PositionType::FREE || _positionType == PositionType::RELATIVE)
                {
                    Point diff = currentPosition - p->startPos;
                    newPos = p->pos - diff;
                } 
                else
                {
                    newPos = p->pos;
                }

                // translate newPos to correct position, since matrix transform isn't performed in batchnode
                // don't update the particle with the new position information, it will interfere with the radius and tangential calculations
                if (_batchNode)
                {
                    newPos.x+=_position.x;
                    newPos.y+=_position.y;
                }

                updateQuadWithParticle(p, newPos);
                //updateParticleImp(self, updateParticleSel, p, newPos);

                // update particle counter
                ++_particleIdx;
            } 
            else 
            {
                // life < 0
                int currentIndex = p->atlasIndex;
                if( _particleIdx != _particleCount-1 )
                {
                    _particles[_particleIdx] = _particles[_particleCount-1];
                }
                if (_batchNode)
                {
                    //disable the switched particle
                    _batchNode->disableParticle(_atlasIndex+currentIndex);

                    //switch indexes
                    _particles[_particleCount-1].atlasIndex = currentIndex;
                }


                --_particleCount;

                if( _particleCount == 0 && _isAutoRemoveOnFinish )
                {
                    this->unscheduleUpdate();
                    _parent->removeChild(this, true);
                    return;
                }
            }
        } //while
        _transformSystemDirty = false;
    }
    if (! _batchNode)
    {
        postStep();
    }

    CC_PROFILER_STOP_CATEGORY(kProfilerCategoryParticles , "CCParticleSystem - update");
}

void ParticleSystem::updateWithNoTime(void)
{
    this->update(0.0f);
}

void ParticleSystem::updateQuadWithParticle(tParticle* particle, const Point& newPosition)
{
    CC_UNUSED_PARAM(particle);
    CC_UNUSED_PARAM(newPosition);
    // should be overridden
}

void ParticleSystem::postStep()
{
    // should be overridden
}

// ParticleSystem - Texture protocol
void ParticleSystem::setTexture(Texture2D* var)
{
    if (_texture != var)
    {
        CC_SAFE_RETAIN(var);
        CC_SAFE_RELEASE(_texture);
        _texture = var;
        updateBlendFunc();
    }
}

void ParticleSystem::updateBlendFunc()
{
    CCASSERT(! _batchNode, "Can't change blending functions when the particle is being batched");

    if(_texture)
    {
        bool premultiplied = _texture->hasPremultipliedAlpha();
        
        _opacityModifyRGB = false;
        
        if( _texture && ( _blendFunc.src == CC_BLEND_SRC && _blendFunc.dst == CC_BLEND_DST ) )
        {
            if( premultiplied )
            {
                _opacityModifyRGB = true;
            }
            else
            {
                _blendFunc = BlendFunc::ALPHA_NON_PREMULTIPLIED;
            }
        }
    }
}

Texture2D * ParticleSystem::getTexture() const
{
    return _texture;
}

// ParticleSystem - Additive Blending
void ParticleSystem::setBlendAdditive(bool additive)
{
    if( additive )
    {
        _blendFunc = BlendFunc::ADDITIVE;
    }
    else
    {
        if( _texture && ! _texture->hasPremultipliedAlpha() )
            _blendFunc = BlendFunc::ALPHA_NON_PREMULTIPLIED;
        else 
            _blendFunc = BlendFunc::ALPHA_PREMULTIPLIED;
    }
}

bool ParticleSystem::isBlendAdditive() const
{
    return( _blendFunc.src == GL_SRC_ALPHA && _blendFunc.dst == GL_ONE);
}

// ParticleSystem - Properties of Gravity Mode 
void ParticleSystem::setTangentialAccel(float t)
{
    CCASSERT( _emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    modeA.tangentialAccel = t;
}

float ParticleSystem::getTangentialAccel() const
{
    CCASSERT( _emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    return modeA.tangentialAccel;
}

void ParticleSystem::setTangentialAccelVar(float t)
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    modeA.tangentialAccelVar = t;
}

float ParticleSystem::getTangentialAccelVar() const
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    return modeA.tangentialAccelVar;
}    

void ParticleSystem::setRadialAccel(float t)
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    modeA.radialAccel = t;
}

float ParticleSystem::getRadialAccel() const
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    return modeA.radialAccel;
}

void ParticleSystem::setRadialAccelVar(float t)
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    modeA.radialAccelVar = t;
}

float ParticleSystem::getRadialAccelVar() const
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    return modeA.radialAccelVar;
}

void ParticleSystem::setRotationIsDir(bool t)
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    modeA.rotationIsDir = t;
}

bool ParticleSystem::getRotationIsDir() const
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    return modeA.rotationIsDir;
}

void ParticleSystem::setGravity(const Point& g)
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    modeA.gravity = g;
}

const Point& ParticleSystem::getGravity()
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    return modeA.gravity;
}

void ParticleSystem::setSpeed(float speed)
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    modeA.speed = speed;
}

float ParticleSystem::getSpeed() const
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    return modeA.speed;
}

void ParticleSystem::setSpeedVar(float speedVar)
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    modeA.speedVar = speedVar;
}

float ParticleSystem::getSpeedVar() const
{
    CCASSERT(_emitterMode == Mode::GRAVITY, "Particle Mode should be Gravity");
    return modeA.speedVar;
}

// ParticleSystem - Properties of Radius Mode
void ParticleSystem::setStartRadius(float startRadius)
{
    CCASSERT(_emitterMode == Mode::RADIUS, "Particle Mode should be Radius");
    modeB.startRadius = startRadius;
}

float ParticleSystem::getStartRadius() const
{
    CCASSERT(_emitterMode == Mode::RADIUS, "Particle Mode should be Radius");
    return modeB.startRadius;
}

void ParticleSystem::setStartRadiusVar(float startRadiusVar)
{
    CCASSERT(_emitterMode == Mode::RADIUS, "Particle Mode should be Radius");
    modeB.startRadiusVar = startRadiusVar;
}

float ParticleSystem::getStartRadiusVar() const
{
    CCASSERT(_emitterMode == Mode::RADIUS, "Particle Mode should be Radius");
    return modeB.startRadiusVar;
}

void ParticleSystem::setEndRadius(float endRadius)
{
    CCASSERT(_emitterMode == Mode::RADIUS, "Particle Mode should be Radius");
    modeB.endRadius = endRadius;
}

float ParticleSystem::getEndRadius() const
{
    CCASSERT(_emitterMode == Mode::RADIUS, "Particle Mode should be Radius");
    return modeB.endRadius;
}

void ParticleSystem::setEndRadiusVar(float endRadiusVar)
{
    CCASSERT(_emitterMode == Mode::RADIUS, "Particle Mode should be Radius");
    modeB.endRadiusVar = endRadiusVar;
}

float ParticleSystem::getEndRadiusVar() const
{
    CCASSERT(_emitterMode == Mode::RADIUS, "Particle Mode should be Radius");
    return modeB.endRadiusVar;
}

void ParticleSystem::setRotatePerSecond(float degrees)
{
    CCASSERT(_emitterMode == Mode::RADIUS, "Particle Mode should be Radius");
    modeB.rotatePerSecond = degrees;
}

float ParticleSystem::getRotatePerSecond() const
{
    CCASSERT(_emitterMode == Mode::RADIUS, "Particle Mode should be Radius");
    return modeB.rotatePerSecond;
}

void ParticleSystem::setRotatePerSecondVar(float degrees)
{
    CCASSERT(_emitterMode == Mode::RADIUS, "Particle Mode should be Radius");
    modeB.rotatePerSecondVar = degrees;
}

float ParticleSystem::getRotatePerSecondVar() const
{
    CCASSERT(_emitterMode == Mode::RADIUS, "Particle Mode should be Radius");
    return modeB.rotatePerSecondVar;
}

bool ParticleSystem::isActive() const
{
    return _isActive;
}

int ParticleSystem::getTotalParticles() const
{
    return _totalParticles;
}

void ParticleSystem::setTotalParticles(int var)
{
    CCASSERT( var <= _allocatedParticles, "Particle: resizing particle array only supported for quads");
    _totalParticles = var;
}

const BlendFunc& ParticleSystem::getBlendFunc() const
{
    return _blendFunc;
}

void ParticleSystem::setBlendFunc(const BlendFunc &blendFunc)
{
    if( _blendFunc.src != blendFunc.src || _blendFunc.dst != blendFunc.dst ) {
        _blendFunc = blendFunc;
        this->updateBlendFunc();
    }
}

bool ParticleSystem::isAutoRemoveOnFinish() const
{
    return _isAutoRemoveOnFinish;
}

void ParticleSystem::setAutoRemoveOnFinish(bool var)
{
    _isAutoRemoveOnFinish = var;
}


// ParticleSystem - methods for batchNode rendering

ParticleBatchNode* ParticleSystem::getBatchNode(void) const
{
    return _batchNode;
}

void ParticleSystem::setBatchNode(ParticleBatchNode* batchNode)
{
    if( _batchNode != batchNode ) {

        _batchNode = batchNode; // weak reference

        if( batchNode ) {
            //each particle needs a unique index
            for (int i = 0; i < _totalParticles; i++)
            {
                _particles[i].atlasIndex=i;
            }
        }
    }
}

//don't use a transform matrix, this is faster
void ParticleSystem::setScale(float s)
{
    _transformSystemDirty = true;
    Node::setScale(s);
}

void ParticleSystem::setRotation(float newRotation)
{
    _transformSystemDirty = true;
    Node::setRotation(newRotation);
}

void ParticleSystem::setScaleX(float newScaleX)
{
    _transformSystemDirty = true;
    Node::setScaleX(newScaleX);
}

void ParticleSystem::setScaleY(float newScaleY)
{
    _transformSystemDirty = true;
    Node::setScaleY(newScaleY);
}


NS_CC_END