axmol/cocos2dx/sprite_nodes/CCSpriteBatchNode.h

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2009-2010 Ricardo Quesada
Copyright (C) 2009      Matt Oswald
Copyright (c) 2011      Zynga Inc.

http://www.cocos2d-x.org

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of this software and associated documentation files (the "Software"), to deal
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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,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/

#ifndef __CC_SPRITE_BATCH_NODE_H__
#define __CC_SPRITE_BATCH_NODE_H__

#include <vector>

#include "base_nodes/CCNode.h"
#include "CCProtocols.h"
#include "textures/CCTextureAtlas.h"
#include "ccMacros.h"

NS_CC_BEGIN

/**
 * @addtogroup sprite_nodes
 * @{
 */


class Sprite;

/** SpriteBatchNode is like a batch node: if it contains children, it will draw them in 1 single OpenGL call
* (often known as "batch draw").
*
* A SpriteBatchNode can reference one and only one texture (one image file, one texture atlas).
* Only the Sprites that are contained in that texture can be added to the SpriteBatchNode.
* All Sprites added to a SpriteBatchNode are drawn in one OpenGL ES draw call.
* If the Sprites are not added to a SpriteBatchNode then an OpenGL ES draw call will be needed for each one, which is less efficient.
*
*
* Limitations:
*  - The only object that is accepted as child (or grandchild, grand-grandchild, etc...) is Sprite or any subclass of Sprite. eg: particles, labels and layer can't be added to a SpriteBatchNode.
*  - Either all its children are Aliased or Antialiased. It can't be a mix. This is because "alias" is a property of the texture, and all the sprites share the same texture.
* 
* @since v0.7.1
*/
class CC_DLL SpriteBatchNode : public Node, public TextureProtocol
{
    static const int DEFAULT_CAPACITY = 29;

public:
    /** creates a SpriteBatchNode with a texture2d and capacity of children.
     The capacity will be increased in 33% in runtime if it run out of space.
     */
    static SpriteBatchNode* createWithTexture(Texture2D* tex, int capacity = DEFAULT_CAPACITY);

    /** creates a SpriteBatchNode with a file image (.png, .jpeg, .pvr, etc) and capacity of children.
     The capacity will be increased in 33% in runtime if it run out of space.
     The file will be loaded using the TextureMgr.
     */
    static SpriteBatchNode* create(const char* fileImage, int capacity = DEFAULT_CAPACITY);

    SpriteBatchNode();
    virtual ~SpriteBatchNode();

    /** initializes a SpriteBatchNode with a texture2d and capacity of children.
     The capacity will be increased in 33% in runtime if it run out of space.
     */
    bool initWithTexture(Texture2D *tex, int capacity);
    /** initializes a SpriteBatchNode with a file image (.png, .jpeg, .pvr, etc) and a capacity of children.
     The capacity will be increased in 33% in runtime if it run out of space.
     The file will be loaded using the TextureMgr.
     * @js init
     * @lua init
     */
    bool initWithFile(const char* fileImage, int capacity);
    bool init();

    /** returns the TextureAtlas object */
    inline TextureAtlas* getTextureAtlas(void) { return _textureAtlas; }

    /** sets the TextureAtlas object */
    inline void setTextureAtlas(TextureAtlas* textureAtlas)
    { 
        if (textureAtlas != _textureAtlas)
        {
            CC_SAFE_RETAIN(textureAtlas);
            CC_SAFE_RELEASE(_textureAtlas);
            _textureAtlas = textureAtlas;
        }
    }

    /** returns an array with the descendants (children, gran children, etc.). 
     This is specific to BatchNode. In order to use the children, use getChildren() instead */
    inline const std::vector<Sprite*>& getDescendants() const { return _descendants; }

    void increaseAtlasCapacity();

    /** removes a child given a certain index. It will also cleanup the running actions depending on the cleanup parameter.
    @warning Removing a child from a SpriteBatchNode is very slow
    */
    void removeChildAtIndex(int index, bool doCleanup);

    void appendChild(Sprite* sprite);
    void removeSpriteFromAtlas(Sprite *sprite);

    int rebuildIndexInOrder(Sprite *parent, int index);
    int highestAtlasIndexInChild(Sprite *sprite);
    int lowestAtlasIndexInChild(Sprite *sprite);
    int atlasIndexForChild(Sprite *sprite, int z);
    /* Sprites use this to start sortChildren, don't call this manually */
    void reorderBatch(bool reorder);

    //
    // Overrides
    //
    // TextureProtocol
    virtual Texture2D* getTexture(void) 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)
    *@endcode
    * @lua NA 
    */
    virtual void setBlendFunc(const BlendFunc &blendFunc) override;
    /**
    * @js NA
    * @lua NA
    */
    virtual const BlendFunc& getBlendFunc(void) const override;

    virtual void visit(void) override;
    using Node::addChild;
    virtual void addChild(Node * child, int zOrder, int tag) override;
    virtual void reorderChild(Node *child, int zOrder) override;
        
    virtual void removeChild(Node *child, bool cleanup) override;
    virtual void removeAllChildrenWithCleanup(bool cleanup) override;
    virtual void sortAllChildren() override;
    virtual void draw(void) override;

protected:
    /** Inserts a quad at a certain index into the texture atlas. The Sprite won't be added into the children array.
     This method should be called only when you are dealing with very big AtlasSrite and when most of the Sprite won't be updated.
     For example: a tile map (TMXMap) or a label with lots of characters (LabelBMFont)
     */
    void insertQuadFromSprite(Sprite *sprite, int index);
    /** Updates a quad at a certain index into the texture atlas. The Sprite won't be added into the children array.
     This method should be called only when you are dealing with very big AtlasSrite and when most of the Sprite won't be updated.
     For example: a tile map (TMXMap) or a label with lots of characters (LabelBMFont)
     */
    void updateQuadFromSprite(Sprite *sprite, int index);
    /* This is the opposite of "addQuadFromSprite.
    It add the sprite to the children and descendants array, but it doesn't update add it to the texture atlas
    */
    SpriteBatchNode * addSpriteWithoutQuad(Sprite *child, int z, int aTag);

    void updateAtlasIndex(Sprite* sprite, int* curIndex);
    void swap(int oldIndex, int newIndex);
    void updateBlendFunc();

    TextureAtlas *_textureAtlas;
    BlendFunc _blendFunc;

    // all descendants: children, grand children, etc...
    // There is not need to retain/release these objects, since they are already retained by _children
    // So, using std::vector<Sprite*> is slightly faster than using cocos2d::Array for this particular case
    std::vector<Sprite*> _descendants;
};

// end of sprite_nodes group
/// @}

NS_CC_END

#endif // __CC_SPRITE_BATCH_NODE_H__