Texture goes black after resumed from backgroud

[nguyenbinh07]

I have this cocos2dx (3.0 ~ 3.3) code (m_Texture and pixBuff are private members of HelloWorldScene) on Windows Phone 8:

In HelloWorldScene:init()

bool HelloWorldScene::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !Layer::init() )
    {
        return false;
    }
    
    Size visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 origin = Director::getInstance()->getVisibleOrigin();

    srand(time(nullptr));
    pixBuff = new int[100 * 100];
    m_Texture = new Texture2D();

    Size s;
    s.width = 100;
    s.height = 100;
    m_Texture->initWithData(pixBuff, 100 * 100 * sizeof(int), Texture2D::PixelFormat::RGBA8888, s.width, s.height, s);
    auto sprite = Sprite::createWithTexture(m_Texture);
    sprite->setPosition(origin.x + visibleSize.width / 2, origin.y + visibleSize.height / 2);
    this->addChild(sprite);

    this->scheduleUpdate();
    return true;
}

void HelloWorldScene::update(float delta)
{
    for (int y = 0; y < 100; ++y) {
        for (int x = 0; x < 100; ++x) {
            pixBuff[y * 100 + x] = rand();
        }
    }

    m_Texture->updateWithData(pixBuff, 0, 0, 100, 100);
}

HelloWorldScene::~HelloWorldScene() {
    m_Texture->release();

    delete[] pixBuff;
}

Everything go okay until I pressed “Windows” button to sent application to background and then pressed “Back” button to resume game, the texture goes black and stop the effect. How can I solve this problem?