/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011      Zynga Inc.
Copyright (c) 2013-2014 Chukong Technologies 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
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include <stdarg.h>
#include "2d/CCLayer.h"
#include "2d/CCDirector.h"
#include "2d/CCScriptSupport.h"
#include "CCShaderCache.h"
#include "2d/CCGLProgram.h"
#include "2d/ccGLStateCache.h"
#include "TransformUtils.h"
// extern
#include "2d/CCEventDispatcher.h"
#include "2d/CCEventListenerTouch.h"
#include "2d/CCEventTouch.h"
#include "2d/CCEventKeyboard.h"
#include "2d/CCEventListenerKeyboard.h"
#include "2d/CCEventAcceleration.h"
#include "2d/CCEventListenerAcceleration.h"
#include "2d/platform/CCDevice.h"
#include "CCScene.h"
#include "2d/renderer/CCCustomCommand.h"
#include "2d/renderer/CCRenderer.h"
#include "deprecated/CCString.h"

#if CC_USE_PHYSICS
#include "physics/CCPhysicsBody.h"
#endif

NS_CC_BEGIN

// Layer
Layer::Layer()
: _touchEnabled(false)
, _accelerometerEnabled(false)
, _keyboardEnabled(false)
, _touchListener(nullptr)
, _keyboardListener(nullptr)
, _accelerationListener(nullptr)
, _touchMode(Touch::DispatchMode::ALL_AT_ONCE)
, _swallowsTouches(true)
#if CC_USE_PHYSICS
, _physicsWorld(nullptr)
#endif
{
    _ignoreAnchorPointForPosition = true;
    setAnchorPoint(Vector2(0.5f, 0.5f));
}

Layer::~Layer()
{
#if CC_USE_PHYSICS
    CC_SAFE_DELETE(_physicsWorld);
#endif
}

bool Layer::init()
{
    bool ret = false;
    do 
    {        
        Director * director;
        CC_BREAK_IF(!(director = Director::getInstance()));
        this->setContentSize(director->getWinSize());
        // success
        ret = true;
    } while(0);
    return ret;
}

Layer *Layer::create()
{
    Layer *ret = new Layer();
    if (ret && ret->init())
    {
        ret->autorelease();
        return ret;
    }
    else
    {
        CC_SAFE_DELETE(ret);
        return nullptr;
    }
}

int Layer::executeScriptTouchHandler(EventTouch::EventCode eventType, Touch* touch, Event* event)
{
#if CC_ENABLE_SCRIPT_BINDING
    if (kScriptTypeLua == _scriptType)
    {
        TouchScriptData data(eventType, this, touch, event);
        ScriptEvent scriptEvent(kTouchEvent, &data);
        return ScriptEngineManager::getInstance()->getScriptEngine()->sendEvent(&scriptEvent);
    }
#endif
    //can not reach it
    return 0;
}

int Layer::executeScriptTouchesHandler(EventTouch::EventCode eventType, const std::vector<Touch*>& touches, Event* event)
{
#if CC_ENABLE_SCRIPT_BINDING
    if (kScriptTypeLua == _scriptType)
    {
        TouchesScriptData data(eventType, this, touches, event);
        ScriptEvent scriptEvent(kTouchesEvent, &data);
        return ScriptEngineManager::getInstance()->getScriptEngine()->sendEvent(&scriptEvent);
    }
#endif
    return 0;
}

#if defined(__GNUC__) && ((__GNUC__ >= 4) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)))
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#elif _MSC_VER >= 1400 //vs 2005 or higher
#pragma warning (push)
#pragma warning (disable: 4996)
#endif

/// isTouchEnabled getter
bool Layer::isTouchEnabled() const
{
    return _touchEnabled;
}

/// isTouchEnabled setter
void Layer::setTouchEnabled(bool enabled)
{
    if (_touchEnabled != enabled)
    {
        _touchEnabled = enabled;
        if (enabled)
        {
            if (_touchListener != nullptr)
                return;

            if( _touchMode == Touch::DispatchMode::ALL_AT_ONCE )
            {
                // Register Touch Event
                auto listener = EventListenerTouchAllAtOnce::create();

                listener->onTouchesBegan = CC_CALLBACK_2(Layer::onTouchesBegan, this);
                listener->onTouchesMoved = CC_CALLBACK_2(Layer::onTouchesMoved, this);
                listener->onTouchesEnded = CC_CALLBACK_2(Layer::onTouchesEnded, this);
                listener->onTouchesCancelled = CC_CALLBACK_2(Layer::onTouchesCancelled, this);

                _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);
                _touchListener = listener;
            }
            else
            {
                // Register Touch Event
                auto listener = EventListenerTouchOneByOne::create();
                listener->setSwallowTouches(_swallowsTouches);

                listener->onTouchBegan = CC_CALLBACK_2(Layer::onTouchBegan, this);
                listener->onTouchMoved = CC_CALLBACK_2(Layer::onTouchMoved, this);
                listener->onTouchEnded = CC_CALLBACK_2(Layer::onTouchEnded, this);
                listener->onTouchCancelled = CC_CALLBACK_2(Layer::onTouchCancelled, this);

                _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);
                _touchListener = listener;
            }
        }
        else
        {
            _eventDispatcher->removeEventListener(_touchListener);
            _touchListener = nullptr;
        }
    }
}

void Layer::setTouchMode(Touch::DispatchMode mode)
{
    if(_touchMode != mode)
    {
        _touchMode = mode;

        if( _touchEnabled)
        {
            setTouchEnabled(false);
            setTouchEnabled(true);
        }
    }
}

void Layer::setSwallowsTouches(bool swallowsTouches)
{
    if (_swallowsTouches != swallowsTouches)
    {
        _swallowsTouches = swallowsTouches;

        if( _touchEnabled)
        {
            setTouchEnabled(false);
            setTouchEnabled(true);
        }
    }
}

Touch::DispatchMode Layer::getTouchMode() const
{
    return _touchMode;
}

bool Layer::isSwallowsTouches() const
{
    return _swallowsTouches;
}

/// isAccelerometerEnabled getter
bool Layer::isAccelerometerEnabled() const
{
    return _accelerometerEnabled;
}
/// isAccelerometerEnabled setter
void Layer::setAccelerometerEnabled(bool enabled)
{
    if (enabled != _accelerometerEnabled)
    {
        _accelerometerEnabled = enabled;

        Device::setAccelerometerEnabled(enabled);

        _eventDispatcher->removeEventListener(_accelerationListener);
        _accelerationListener = nullptr;

        if (enabled)
        {
            _accelerationListener = EventListenerAcceleration::create(CC_CALLBACK_2(Layer::onAcceleration, this));
            _eventDispatcher->addEventListenerWithSceneGraphPriority(_accelerationListener, this);
        }
    }
}

void Layer::setAccelerometerInterval(double interval) {
    if (_accelerometerEnabled)
    {
        if (_running)
        {
            Device::setAccelerometerInterval(interval);
        }
    }
}

void Layer::onAcceleration(Acceleration* acc, Event* unused_event)
{
    CC_UNUSED_PARAM(acc);
    CC_UNUSED_PARAM(unused_event);
#if CC_ENABLE_SCRIPT_BINDING
    if(kScriptTypeNone != _scriptType)
    {
        BasicScriptData data(this,(void*)acc);
        ScriptEvent event(kAccelerometerEvent,&data);
        ScriptEngineManager::getInstance()->getScriptEngine()->sendEvent(&event);
    }
#endif
}

void Layer::onKeyPressed(EventKeyboard::KeyCode keyCode, Event* unused_event)
{
    CC_UNUSED_PARAM(keyCode);
    CC_UNUSED_PARAM(unused_event);
}

void Layer::onKeyReleased(EventKeyboard::KeyCode keyCode, Event* unused_event)
{
    CC_UNUSED_PARAM(unused_event);
#if CC_ENABLE_SCRIPT_BINDING
    if(kScriptTypeNone != _scriptType)
    {
        KeypadScriptData data(keyCode, this);
        ScriptEvent event(kKeypadEvent,&data);
        ScriptEngineManager::getInstance()->getScriptEngine()->sendEvent(&event);
    }
#endif
}

/// isKeyboardEnabled getter
bool Layer::isKeyboardEnabled() const
{
    return _keyboardEnabled;
}
/// isKeyboardEnabled setter
void Layer::setKeyboardEnabled(bool enabled)
{
    if (enabled != _keyboardEnabled)
    {
        _keyboardEnabled = enabled;

        _eventDispatcher->removeEventListener(_keyboardListener);
        _keyboardListener = nullptr;

        if (enabled)
        {
            auto listener = EventListenerKeyboard::create();
            listener->onKeyPressed = CC_CALLBACK_2(Layer::onKeyPressed, this);
            listener->onKeyReleased = CC_CALLBACK_2(Layer::onKeyReleased, this);

            _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);
            _keyboardListener = listener;
        }
    }
}

void Layer::setKeypadEnabled(bool enabled)
{
    setKeyboardEnabled(enabled);
}
/// Callbacks

bool Layer::onTouchBegan(Touch *touch, Event *event)
{
#if CC_ENABLE_SCRIPT_BINDING
    if (kScriptTypeLua == _scriptType)
    {
        return executeScriptTouchHandler(EventTouch::EventCode::BEGAN, touch, event) == 0 ? false : true;
    }
#endif
    CC_UNUSED_PARAM(event);
    CCASSERT(false, "Layer#ccTouchBegan override me");
    return true;
}

void Layer::onTouchMoved(Touch *touch, Event *event)
{
#if CC_ENABLE_SCRIPT_BINDING
    if (kScriptTypeLua == _scriptType)
    {
        executeScriptTouchHandler(EventTouch::EventCode::MOVED, touch, event);
        return;
    }
#endif
    
    CC_UNUSED_PARAM(event);
}

void Layer::onTouchEnded(Touch *touch, Event *event)
{
#if CC_ENABLE_SCRIPT_BINDING
    if (kScriptTypeLua == _scriptType)
    {
        executeScriptTouchHandler(EventTouch::EventCode::ENDED, touch, event);
        return;
    }
#endif
    
    CC_UNUSED_PARAM(event);
}

void Layer::onTouchCancelled(Touch *touch, Event *event)
{
#if CC_ENABLE_SCRIPT_BINDING
    if (kScriptTypeLua == _scriptType)
    {
        executeScriptTouchHandler(EventTouch::EventCode::CANCELLED, touch, event);
        return;
    }
#endif
    
    CC_UNUSED_PARAM(event);
}    

void Layer::onTouchesBegan(const std::vector<Touch*>& touches, Event *event)
{
#if CC_ENABLE_SCRIPT_BINDING
    if (kScriptTypeLua == _scriptType)
    {
        executeScriptTouchesHandler(EventTouch::EventCode::BEGAN, touches, event);
        return;
    }
#endif
    CC_UNUSED_PARAM(event);
}

void Layer::onTouchesMoved(const std::vector<Touch*>& touches, Event *event)
{
#if CC_ENABLE_SCRIPT_BINDING
    if (kScriptTypeLua == _scriptType)
    {
        executeScriptTouchesHandler(EventTouch::EventCode::MOVED, touches, event);
        return;
    }
#endif
    
    CC_UNUSED_PARAM(event);
}

void Layer::onTouchesEnded(const std::vector<Touch*>& touches, Event *event)
{
#if CC_ENABLE_SCRIPT_BINDING
    if (kScriptTypeLua == _scriptType)
    {
        executeScriptTouchesHandler(EventTouch::EventCode::ENDED, touches, event);
        return;
    }
#endif
    CC_UNUSED_PARAM(event);
}

void Layer::onTouchesCancelled(const std::vector<Touch*>& touches, Event *event)
{
#if CC_ENABLE_SCRIPT_BINDING
    if (kScriptTypeLua == _scriptType)
    {
        executeScriptTouchesHandler(EventTouch::EventCode::CANCELLED, touches, event);
        return;
    }
#endif
    CC_UNUSED_PARAM(event);
}

std::string Layer::getDescription() const
{
    return StringUtils::format("<Layer | Tag = %d>", _tag);
}

#if CC_USE_PHYSICS
void Layer::onEnter()
{
    Node::onEnter();
    
    if (_physicsWorld != nullptr)
    {
        this->schedule(schedule_selector(Layer::updatePhysics));
    }
}

void Layer::onExit()
{
    Node::onExit();
    
    if (_physicsWorld != nullptr)
    {
        this->unschedule(schedule_selector(Layer::updatePhysics));
    }
}

void Layer::updatePhysics(float delta)
{
    if (nullptr != _physicsWorld)
    {
        _physicsWorld->update(delta);
    }
}

Layer* Layer::createWithPhysics()
{
    Layer *ret = new Layer();
    if (ret && ret->initWithPhysics())
    {
        ret->autorelease();
        return ret;
    }
    else
    {
        CC_SAFE_DELETE(ret);
        return nullptr;
    }
}

bool Layer::initWithPhysics()
{
    bool ret = false;
    do
    {
        Director * director;
        CC_BREAK_IF( ! (director = Director::getInstance()) );
        this->setContentSize(director->getWinSize());
        CC_BREAK_IF(! (_physicsWorld = PhysicsWorld::construct(*this)));

        // success
        ret = true;
    } while (0);
    return ret;
}

void Layer::addChildToPhysicsWorld(Node* child)
{
    if (_physicsWorld)
    {
        std::function<void(Node*)> addToPhysicsWorldFunc = nullptr;
        addToPhysicsWorldFunc = [this, &addToPhysicsWorldFunc](Node* node) -> void
        {
            if (node->getPhysicsBody())
            {
                _physicsWorld->addBody(node->getPhysicsBody());
                
                node->updatePhysicsBodyPosition(this);
                node->updatePhysicsBodyRotation(this);
            }
            
            auto& children = node->getChildren();
            for( const auto &n : children) {
                addToPhysicsWorldFunc(n);
            }
        };
        
        addToPhysicsWorldFunc(child);
    }
}
#endif


__LayerRGBA::__LayerRGBA()
{
    CCLOG("LayerRGBA deprecated.");
}


#if defined(__GNUC__) && ((__GNUC__ >= 4) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)))
#pragma GCC diagnostic warning "-Wdeprecated-declarations"
#elif _MSC_VER >= 1400 //vs 2005 or higher
#pragma warning (pop)
#endif
/// LayerColor

LayerColor::LayerColor()
{
    // default blend function
    _blendFunc = BlendFunc::ALPHA_PREMULTIPLIED;
}
    
LayerColor::~LayerColor()
{
}

/// blendFunc getter
const BlendFunc &LayerColor::getBlendFunc() const
{
    return _blendFunc;
}
/// blendFunc setter
void LayerColor::setBlendFunc(const BlendFunc &var)
{
    _blendFunc = var;
}

LayerColor* LayerColor::create()
{
    LayerColor* ret = new LayerColor();
    if (ret && ret->init())
    {
        ret->autorelease();
    }
    else
    {
        CC_SAFE_DELETE(ret);
    }
    return ret;
}

LayerColor * LayerColor::create(const Color4B& color, GLfloat width, GLfloat height)
{
    LayerColor * layer = new LayerColor();
    if( layer && layer->initWithColor(color,width,height))
    {
        layer->autorelease();
        return layer;
    }
    CC_SAFE_DELETE(layer);
    return nullptr;
}

LayerColor * LayerColor::create(const Color4B& color)
{
    LayerColor * layer = new LayerColor();
    if(layer && layer->initWithColor(color))
    {
        layer->autorelease();
        return layer;
    }
    CC_SAFE_DELETE(layer);
    return nullptr;
}

bool LayerColor::init()
{
    Size s = Director::getInstance()->getWinSize();
    return initWithColor(Color4B(0,0,0,0), s.width, s.height);
}

bool LayerColor::initWithColor(const Color4B& color, GLfloat w, GLfloat h)
{
    if (Layer::init())
    {

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

        _displayedColor.r = _realColor.r = color.r;
        _displayedColor.g = _realColor.g = color.g;
        _displayedColor.b = _realColor.b = color.b;
        _displayedOpacity = _realOpacity = color.a;

        for (size_t i = 0; i<sizeof(_squareVertices) / sizeof( _squareVertices[0]); i++ )
        {
            _squareVertices[i].x = 0.0f;
            _squareVertices[i].y = 0.0f;
        }

        updateColor();
        setContentSize(Size(w, h));

        setShaderProgram(ShaderCache::getInstance()->getProgram(GLProgram::SHADER_NAME_POSITION_COLOR_NO_MVP));
        return true;
    }
    return false;
}

bool LayerColor::initWithColor(const Color4B& color)
{
    Size s = Director::getInstance()->getWinSize();
    this->initWithColor(color, s.width, s.height);
    return true;
}

/// override contentSize
void LayerColor::setContentSize(const Size & size)
{
    _squareVertices[1].x = size.width;
    _squareVertices[2].y = size.height;
    _squareVertices[3].x = size.width;
    _squareVertices[3].y = size.height;

    Layer::setContentSize(size);
}

void LayerColor::changeWidthAndHeight(GLfloat w ,GLfloat h)
{
    this->setContentSize(Size(w, h));
}

void LayerColor::changeWidth(GLfloat w)
{
    this->setContentSize(Size(w, _contentSize.height));
}

void LayerColor::changeHeight(GLfloat h)
{
    this->setContentSize(Size(_contentSize.width, h));
}

void LayerColor::updateColor()
{
    for( unsigned int i=0; i < 4; i++ )
    {
        _squareColors[i].r = _displayedColor.r / 255.0f;
        _squareColors[i].g = _displayedColor.g / 255.0f;
        _squareColors[i].b = _displayedColor.b / 255.0f;
        _squareColors[i].a = _displayedOpacity / 255.0f;
    }
}

void LayerColor::draw(Renderer *renderer, const Matrix &transform, bool transformUpdated)
{
    _customCommand.init(_globalZOrder);
    _customCommand.func = CC_CALLBACK_0(LayerColor::onDraw, this, transform, transformUpdated);
    renderer->addCommand(&_customCommand);
    
    for(int i = 0; i < 4; ++i)
    {
        Vector4 pos;
        pos.x = _squareVertices[i].x; pos.y = _squareVertices[i].y; pos.z = _positionZ;
        pos.w = 1;
        _modelViewTransform.transformVector(&pos);
        _noMVPVertices[i] = Vector3(pos.x,pos.y,pos.z)/pos.w;
    }
}

void LayerColor::onDraw(const Matrix& transform, bool transformUpdated)
{
    getShaderProgram()->use();
    getShaderProgram()->setUniformsForBuiltins(transform);

    GL::enableVertexAttribs( GL::VERTEX_ATTRIB_FLAG_POSITION | GL::VERTEX_ATTRIB_FLAG_COLOR );
    //
    // Attributes
    //
#ifdef EMSCRIPTEN
    setGLBufferData(_noMVPVertices, 4 * sizeof(Vector3), 0);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 3, GL_FLOAT, GL_FALSE, 0, 0);

    setGLBufferData(_squareColors, 4 * sizeof(Color4F), 1);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_COLOR, 4, GL_FLOAT, GL_FALSE, 0, 0);
#else
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 3, GL_FLOAT, GL_FALSE, 0, _noMVPVertices);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_COLOR, 4, GL_FLOAT, GL_FALSE, 0, _squareColors);
#endif // EMSCRIPTEN

    GL::blendFunc( _blendFunc.src, _blendFunc.dst );

    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

    CC_INCREMENT_GL_DRAWN_BATCHES_AND_VERTICES(1,4);
}

std::string LayerColor::getDescription() const
{
    return StringUtils::format("<LayerColor | Tag = %d>", _tag);
}

//
// LayerGradient
//
LayerGradient::LayerGradient()
: _startColor(Color4B::BLACK)
, _endColor(Color4B::BLACK)
, _startOpacity(255)
, _endOpacity(255)
, _alongVector(Vector2(0, -1))
, _compressedInterpolation(true)
{
    
}

LayerGradient::~LayerGradient()
{
}

LayerGradient* LayerGradient::create(const Color4B& start, const Color4B& end)
{
    LayerGradient * layer = new LayerGradient();
    if( layer && layer->initWithColor(start, end))
    {
        layer->autorelease();
        return layer;
    }
    CC_SAFE_DELETE(layer);
    return nullptr;
}

LayerGradient* LayerGradient::create(const Color4B& start, const Color4B& end, const Vector2& v)
{
    LayerGradient * layer = new LayerGradient();
    if( layer && layer->initWithColor(start, end, v))
    {
        layer->autorelease();
        return layer;
    }
    CC_SAFE_DELETE(layer);
    return nullptr;
}

LayerGradient* LayerGradient::create()
{
    LayerGradient* ret = new LayerGradient();
    if (ret && ret->init())
    {
        ret->autorelease();
    }
    else
    {
        CC_SAFE_DELETE(ret);
    }
    return ret;
}

bool LayerGradient::init()
{
	return initWithColor(Color4B(0, 0, 0, 255), Color4B(0, 0, 0, 255));
}

bool LayerGradient::initWithColor(const Color4B& start, const Color4B& end)
{
    return initWithColor(start, end, Vector2(0, -1));
}

bool LayerGradient::initWithColor(const Color4B& start, const Color4B& end, const Vector2& v)
{
    _endColor.r  = end.r;
    _endColor.g  = end.g;
    _endColor.b  = end.b;

    _endOpacity     = end.a;
    _startOpacity   = start.a;
    _alongVector    = v;

    _compressedInterpolation = true;

    return LayerColor::initWithColor(Color4B(start.r, start.g, start.b, 255));
}

void LayerGradient::updateColor()
{
    LayerColor::updateColor();

    float h = _alongVector.getLength();
    if (h == 0)
        return;

    float c = sqrtf(2.0f);
    Vector2 u = Vector2(_alongVector.x / h, _alongVector.y / h);

    // Compressed Interpolation mode
    if (_compressedInterpolation)
    {
        float h2 = 1 / ( fabsf(u.x) + fabsf(u.y) );
        u = u * (h2 * (float)c);
    }

    float opacityf = (float)_displayedOpacity / 255.0f;

    Color4F S(
        _displayedColor.r / 255.0f,
        _displayedColor.g / 255.0f,
        _displayedColor.b / 255.0f,
        _startOpacity * opacityf / 255.0f
    );

    Color4F E(
        _endColor.r / 255.0f,
        _endColor.g / 255.0f,
        _endColor.b / 255.0f,
        _endOpacity * opacityf / 255.0f
    );

    // (-1, -1)
    _squareColors[0].r = E.r + (S.r - E.r) * ((c + u.x + u.y) / (2.0f * c));
    _squareColors[0].g = E.g + (S.g - E.g) * ((c + u.x + u.y) / (2.0f * c));
    _squareColors[0].b = E.b + (S.b - E.b) * ((c + u.x + u.y) / (2.0f * c));
    _squareColors[0].a = E.a + (S.a - E.a) * ((c + u.x + u.y) / (2.0f * c));
    // (1, -1)
    _squareColors[1].r = E.r + (S.r - E.r) * ((c - u.x + u.y) / (2.0f * c));
    _squareColors[1].g = E.g + (S.g - E.g) * ((c - u.x + u.y) / (2.0f * c));
    _squareColors[1].b = E.b + (S.b - E.b) * ((c - u.x + u.y) / (2.0f * c));
    _squareColors[1].a = E.a + (S.a - E.a) * ((c - u.x + u.y) / (2.0f * c));
    // (-1, 1)
    _squareColors[2].r = E.r + (S.r - E.r) * ((c + u.x - u.y) / (2.0f * c));
    _squareColors[2].g = E.g + (S.g - E.g) * ((c + u.x - u.y) / (2.0f * c));
    _squareColors[2].b = E.b + (S.b - E.b) * ((c + u.x - u.y) / (2.0f * c));
    _squareColors[2].a = E.a + (S.a - E.a) * ((c + u.x - u.y) / (2.0f * c));
    // (1, 1)
    _squareColors[3].r = E.r + (S.r - E.r) * ((c - u.x - u.y) / (2.0f * c));
    _squareColors[3].g = E.g + (S.g - E.g) * ((c - u.x - u.y) / (2.0f * c));
    _squareColors[3].b = E.b + (S.b - E.b) * ((c - u.x - u.y) / (2.0f * c));
    _squareColors[3].a = E.a + (S.a - E.a) * ((c - u.x - u.y) / (2.0f * c));
}

const Color3B& LayerGradient::getStartColor() const
{
    return _realColor;
}

void LayerGradient::setStartColor(const Color3B& color)
{
    setColor(color);
}

void LayerGradient::setEndColor(const Color3B& color)
{
    _endColor = color;
    updateColor();
}

const Color3B& LayerGradient::getEndColor() const
{
    return _endColor;
}

void LayerGradient::setStartOpacity(GLubyte o)
{
    _startOpacity = o;
    updateColor();
}

GLubyte LayerGradient::getStartOpacity() const
{
    return _startOpacity;
}

void LayerGradient::setEndOpacity(GLubyte o)
{
    _endOpacity = o;
    updateColor();
}

GLubyte LayerGradient::getEndOpacity() const
{
    return _endOpacity;
}

void LayerGradient::setVector(const Vector2& var)
{
    _alongVector = var;
    updateColor();
}

const Vector2& LayerGradient::getVector() const
{
    return _alongVector;
}

bool LayerGradient::isCompressedInterpolation() const
{
    return _compressedInterpolation;
}

void LayerGradient::setCompressedInterpolation(bool compress)
{
    _compressedInterpolation = compress;
    updateColor();
}

std::string LayerGradient::getDescription() const
{
    return StringUtils::format("<LayerGradient | Tag = %d>", _tag);
}

/// MultiplexLayer

LayerMultiplex::LayerMultiplex()
: _enabledLayer(0)
{
}

LayerMultiplex::~LayerMultiplex()
{
    for(const auto &layer : _layers) {
        layer->cleanup();
    }
}

#if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
LayerMultiplex * LayerMultiplex::createVariadic(Layer * layer, ...)
{
    va_list args;
    va_start(args,layer);

    LayerMultiplex * multiplexLayer = new LayerMultiplex();
    if(multiplexLayer && multiplexLayer->initWithLayers(layer, args))
    {
        multiplexLayer->autorelease();
        va_end(args);
        return multiplexLayer;
    }
    va_end(args);
    CC_SAFE_DELETE(multiplexLayer);
    return nullptr;
}
#else
LayerMultiplex * LayerMultiplex::create(Layer * layer, ...)
{
    va_list args;
    va_start(args,layer);

    LayerMultiplex * multiplexLayer = new LayerMultiplex();
    if(multiplexLayer && multiplexLayer->initWithLayers(layer, args))
    {
        multiplexLayer->autorelease();
        va_end(args);
        return multiplexLayer;
    }
    va_end(args);
    CC_SAFE_DELETE(multiplexLayer);
    return nullptr;
}
#endif

LayerMultiplex * LayerMultiplex::createWithLayer(Layer* layer)
{
    return LayerMultiplex::create(layer, NULL);
}

LayerMultiplex* LayerMultiplex::create()
{
    LayerMultiplex* ret = new LayerMultiplex();
    if (ret && ret->init())
    {
        ret->autorelease();
    }
    else
    {
        CC_SAFE_DELETE(ret);
    }
    return ret;
}

LayerMultiplex* LayerMultiplex::createWithArray(const Vector<Layer*>& arrayOfLayers)
{
    LayerMultiplex* ret = new LayerMultiplex();
    if (ret && ret->initWithArray(arrayOfLayers))
    {
        ret->autorelease();
    }
    else
    {
        CC_SAFE_DELETE(ret);
    }
    return ret;
}

void LayerMultiplex::addLayer(Layer* layer)
{
    _layers.pushBack(layer);
}

bool LayerMultiplex::init()
{
    if (Layer::init())
    {
        _enabledLayer = 0;
        return true;
    }
    return false;
}

bool LayerMultiplex::initWithLayers(Layer *layer, va_list params)
{
    if (Layer::init())
    {
        _layers.reserve(5);
        _layers.pushBack(layer);

        Layer *l = va_arg(params,Layer*);
        while( l ) {
            _layers.pushBack(l);
            l = va_arg(params,Layer*);
        }

        _enabledLayer = 0;
        this->addChild(_layers.at(_enabledLayer));
        return true;
    }

    return false;
}

bool LayerMultiplex::initWithArray(const Vector<Layer*>& arrayOfLayers)
{
    if (Layer::init())
    {
        _layers.reserve(arrayOfLayers.size());
        _layers.pushBack(arrayOfLayers);

        _enabledLayer = 0;
        this->addChild(_layers.at(_enabledLayer));
        return true;
    }
    return false;
}

void LayerMultiplex::switchTo(int n)
{
    CCASSERT( n < _layers.size(), "Invalid index in MultiplexLayer switchTo message" );

    this->removeChild(_layers.at(_enabledLayer), true);

    _enabledLayer = n;

    this->addChild(_layers.at(n));
}

void LayerMultiplex::switchToAndReleaseMe(int n)
{
    CCASSERT( n < _layers.size(), "Invalid index in MultiplexLayer switchTo message" );

    this->removeChild(_layers.at(_enabledLayer), true);

    _layers.replace(_enabledLayer, nullptr);

    _enabledLayer = n;

    this->addChild(_layers.at(n));
}

std::string LayerMultiplex::getDescription() const
{
    return StringUtils::format("<LayerMultiplex | Tag = %d, Layers = %d", _tag, static_cast<int>(_children.size()));
}

NS_CC_END