cocos2d 3.x 纹理缓存

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官方的开发文档就是坑

http://cn.cocos2d-x.org/article/index?type=cocos2d-x&url=/doc/cocos-docs-master/manual/framework/native/v2/memory/texture-cache/zh.md

就不能提供个版本号？

3.x中纹理缓存的实列获取改为了

Director::getInstance()->getTextureCache()

Director头文件中把TextureCache当成了一个保护成员变量

//texture cache belongs to this director
TextureCache *_textureCache;

Director关于TextureCache的函数有四个

<span style="color:#330000;">TextureCache* Director::getTextureCache() const{    return _textureCache;//返回TextureCache实列对象}void Director::initTextureCache()//这个是初始化TextureCache,在Director::init()里调用{#ifdef EMSCRIPTEN    _textureCache = new (std::nothrow) TextureCacheEmscripten();#else    _textureCache = new (std::nothrow) TextureCache();#endif // EMSCRIPTEN}void Director::destroyTextureCache()//这个应该是销毁函数，在purgeDirector()里调用，我感觉怎么是向线程的延时，没看太懂{                                   //purgeDirector()是在DisplayLinkDirector里调用，这个类继承于Director    if (_textureCache)    {        _textureCache->waitForQuit();        CC_SAFE_RELEASE_NULL(_textureCache);    }}void Director::purgeCachedData(void)//这个是清空无用的缓存{    FontFNT::purgeCachedData();//1    FontAtlasCache::purgeCachedData();//2    if (s_SharedDirector->getOpenGLView())    {        SpriteFrameCache::getInstance()->removeUnusedSpriteFrames();//3        _textureCache->removeUnusedTextures();//4        // Note: some tests such as ActionsTest are leaking refcounted textures        // There should be no test textures left in the cache        log("%s\n", _textureCache->getCachedTextureInfo().c_str());    }    FileUtils::getInstance()->purgeCachedEntries();//5}</span>

真正用到的应该是Director::getInstance()->getTextureCache()

关于TextureCache类的方法

<span style="color:#660000;">void TextureCache::addImageAsync(const std::string &path, const std::function<void(Texture2D*)>& callback)//异步加载方式,第一个是文件路径，第二个是回调函数{    Texture2D *texture = nullptr;    std::string fullpath = FileUtils::getInstance()->fullPathForFilename(path);    auto it = _textures.find(fullpath);    if( it != _textures.end() )        texture = it->second;    if (texture != nullptr)    {        callback(texture);        return;    }    // lazy init    if (_asyncStructQueue == nullptr)    {                     _asyncStructQueue = new queue<AsyncStruct*>();        _imageInfoQueue   = new deque<ImageInfo*>();                // create a new thread to load images        _loadingThread = new std::thread(&TextureCache::loadImage, this);        _needQuit = false;    }    if (0 == _asyncRefCount)    {        Director::getInstance()->getScheduler()->schedule(CC_SCHEDULE_SELECTOR(TextureCache::addImageAsyncCallBack), this, 0, false);    }    ++_asyncRefCount;    // generate async struct    AsyncStruct *data = new (std::nothrow) AsyncStruct(fullpath, callback);    // add async struct into queue    _asyncStructQueueMutex.lock();    _asyncStructQueue->push(data);    _asyncStructQueueMutex.unlock();    _sleepCondition.notify_one();}关于addImage</span>

a:Texture2D * TextureCache::addImage(const std::string &path)b:Texture2D* TextureCache::addImage(Image *image, const std::string &key)对a来说默认的key是文件名称对b来说可以自定义keya和b这两种方式都返回加载好的纹理，所以要进行用Texture2D类型的变量进行赋值。回收可以用void TextureCache::removeTexture(Texture2D* texture)或void TextureCache::removeTextureForKey(const std::string &textureKeyName)来进行获取可以用Texture2D* TextureCache::getTextureForKey(const std::string &textureKeyName) const

SpriteFrame的用法基本没变。

技术比较水，努力中

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