Cocos2d-x 3.0多线程异步资源加载代码

最新推荐文章于 2020-09-17 10:28:35 发布

转载最新推荐文章于 2020-09-17 10:28:35 发布 · 1.2k 阅读

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#多线程

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本文详细介绍了如何在Cocos2DX 3中实现多线程资源加载，通过创建独立的加载线程，利用渲染线程与工作线程之间的交互媒介来同步加载资源，确保游戏启动时资源快速就绪。

// AppDelegate.cpp
bool AppDelegate::applicationDidFinishLaunching() {
    … …
    FlashScene* scene = FlashScene::create();
    pDirector->runWithScene(scene);

    return true;
}

//FlashScene.h
//在FlashScene init时，我们创建一个Resource Load Thread，我们用一个ResourceLoadIndicator作为渲染线程与Worker线程之间交互的媒介。

struct ResourceLoadIndicator {
    pthread_mutex_t mutex;
    bool load_done;
    void *context;
};

class FlashScene : public Scene
{
public:
    FlashScene(void);
    ~FlashScene(void);

    virtual bool init();

    CREATE_FUNC(FlashScene);
    bool getResourceLoadIndicator();
    void setResourceLoadIndicator(bool flag);

private:
     void updateScene(float dt);

private:
     ResourceLoadIndicator rli;
};

// FlashScene.cpp
bool FlashScene::init()
{
    bool bRet = false;
    do {
        CC_BREAK_IF(!CCScene::init());
        Size winSize = Director::getInstance()->getWinSize();

        //FlashScene自己的资源只能同步加载了
        Sprite *bg = Sprite::create("FlashSceenBg.png");
        CC_BREAK_IF(!bg);
        bg->setPosition(ccp(winSize.width/2, winSize.height/2));
        this->addChild(bg, 0);

        this->schedule(schedule_selector(FlashScene::updateScene)
                       , 0.01f);

        //start the resource loading thread
        rli.load_done = false;
        rli.context = (void*)this;
        pthread_mutex_init(&rli.mutex, NULL);
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
        pthread_t thread;
        pthread_create(&thread, &attr,
                    resource_load_thread_entry, &rli);

        bRet=true;
    } while(0);

    return bRet;
}

static void* resource_load_thread_entry(void* param)
{
    AppDelegate *app = (AppDelegate*)Application::getInstance();
    ResourceLoadIndicator *rli = (ResourceLoadIndicator*)param;
    FlashScene *scene = (FlashScene*)rli->context;

    //load music effect resource
    … …

    //init from config files
    … …

    //load images data in worker thread
    SpriteFrameCache::getInstance()->addSpriteFramesWithFile(
                                       "All-Sprites.plist");
    … …

    //set loading done
    scene->setResourceLoadIndicator(true);
    return NULL;
}

bool FlashScene::getResourceLoadIndicator()
{
    bool flag;
    pthread_mutex_lock(&rli.mutex);
    flag = rli.load_done;
    pthread_mutex_unlock(&rli.mutex);
    return flag;
}

void FlashScene::setResourceLoadIndicator(bool flag)
{
    pthread_mutex_lock(&rli.mutex);
    rli.load_done = flag;
    pthread_mutex_unlock(&rli.mutex);
    return;
}

//我们在定时器回调函数中对indicator标志位进行检查，当发现加载ok后，切换到接下来的游戏开始场景：

void FlashScene::updateScene(float dt)
{
    if (getResourceLoadIndicator()) {
        Director::getInstance()->replaceScene(
                              WelcomeScene::create());
    }
}

添加1：

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
#include "platform/android/jni/JniHelper.h"
#include <jni.h>
#endif

static void* resource_load_thread_entry(void* param)
{
    … …

    JavaVM *vm;
    JNIEnv *env;
    vm = JniHelper::getJavaVM();

    JavaVMAttachArgs thread_args;

    thread_args.name = "Resource Load";
    thread_args.version = JNI_VERSION_1_4;
    thread_args.group = NULL;

    vm->AttachCurrentThread(&env, &thread_args);
    … …
    //Your Jni Calls
    … …

    vm->DetachCurrentThread();
    … …
    return NULL;
}

添加2：

static void* resource_load_thread_entry(void* param)
{
    … …
    allSpritesImage = new Image();
    allSpritesImage->initWithImageFile("All-Sprites.png");
    … …
}

void FlashScene::updateScene(float dt)
{
    if (getResourceLoadIndicator()) {
        // construct texture with preloaded images
        Texture2D *allSpritesTexture = TextureCache::getInstance()->
                           addImage(allSpritesImage, "All-Sprites.png");
        allSpritesImage->release();
        SpriteFrameCache::getInstance()->addSpriteFramesWithFile(
                           "All-Sprites.plist", allSpritesTexture);
     
        Director::getInstance()->replaceScene(WelcomeScene::create());
    }
}

原文请点击http://tonybai.com/2014/04/28/multithreaded-resource-loading-in-cocos2dx-3/#456117-tsina-1-31981-009447aba45211dfcf25030d3e849f76