如何在cocos2d中启用多点触控？

#include "AppDelegate.h"
#include "HelloWorldScene.h"
#include "cocos2d.h"

USING_NS_CC;

AppDelegate::AppDelegate() {

}

AppDelegate::~AppDelegate() 
{
}

bool AppDelegate::applicationDidFinishLaunching() {
    // initialize director
    auto director = Director::getInstance();
    auto glview = director->getOpenGLView();
    if(!glview) {
        glview = GLViewImpl::createWithRect("Cocos2d", Rect(0, 0, 800, 450));
        director->setOpenGLView(glview);
    }

    // Set the design resolution
    glview->setDesignResolutionSize(800, 450, ResolutionPolicy::NO_BORDER);

    // Turn on multi-touch
    glview->setMultipleTouchEnabled(true);

    // ...
}

#include "HelloWorldScene.h"
#include "cocos2d.h"

USING_NS_CC;

Scene* HelloWorld::createScene()
{
    // 'scene' is an autorelease object
    auto scene = Scene::create();
    
    // 'layer' is an autorelease object
    auto layer = HelloWorld::create();

    // add layer as a child to scene
    scene->addChild(layer);

    // ...

    // Create a touch event listener
    auto touchListener = EventListenerTouchAllAtOnce::create();
    touchListener->onTouchesBegan = CC_CALLBACK_2(HelloWorld::onTouchesBegan, this);
    touchListener->onTouchesMoved = CC_CALLBACK_2(HelloWorld::onTouchesMoved, this);
    touchListener->onTouchesEnded = CC_CALLBACK_2(HelloWorld::onTouchesEnded, this);

    // Add the touch event listener to the event dispatcher
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);

    return scene;
}

bool HelloWorld::onTouchesBegan(const std::vector<Touch*>& touches, Event* event)
{
    for (auto& touch : touches)
    {
        // Handle the touch began event
    }
    return true;
}

void HelloWorld::onTouchesMoved(const std::vector<Touch*>& touches, Event* event)
{
    for (auto& touch : touches)
    {
        // Handle the touch moved event
    }
}

void HelloWorld::onTouchesEnded(const std::vector<Touch*>& touches, Event* event)
{
    for (auto& touch : touches)
    {
        // Handle the touch ended event
    }
}