Methodological issues in the init DrawNode 0-004.cocos2dx [COCOS2DX-LUA]

1. incentives

　　Recently, the project access to the Bugly, reported some unusual test does not come out, or difficult to reproduce the bug, this kind of bug is very difficult to troubleshoot. There are two reasons, first, the problem can not be reproduced, second, revised the results could not be verified immediately. There is a problem annoys me a long time, that has been reported this error code. (DispatchEvent error)

void Java_org_cocos2dx_lib_Cocos2dxRenderer_nativeInit(JNIEnv*  env, jobject thiz, jint w, jint h)
{
    auto director = cocos2d::Director::getInstance();
    auto glview = director->getOpenGLView();
    if (!glview)
    {
        glview = cocos2d::GLViewImpl::create("Android app");
        glview->setFrameSize(w, h);
        director->setOpenGLView(glview);

        //cocos_android_app_init(env, thiz);

        cocos2d::Application::getInstance()->run();
    }
    else
    {
        cocos2d::GL::invalidateStateCache();
        cocos2d::GLProgramCache::getInstance()->reloadDefaultGLPrograms();
        cocos2d::DrawPrimitives::init();
        cocos2d::VolatileTextureMgr::reloadAllTextures();

        cocos2d::EventCustom recreatedEvent(EVENT_RENDERER_RECREATED);
        director->getEventDispatcher()->dispatchEvent(&recreatedEvent);
        director->setGLDefaultValues();
    }
}

2. Analysis of the problem

This is a look back in order to prevent the return Andrews resources to rebuild, went there to find all the resources to do the reconstruction of the class, this view found the following code.

bool DrawNode::init()
{
    _blendFunc = BlendFunc::ALPHA_PREMULTIPLIED;

    setGLProgramState(GLProgramState::getOrCreateWithGLProgramName(GLProgram::SHADER_NAME_POSITION_LENGTH_TEXTURE_COLOR));
    
    ensureCapacity(512);
    ensureCapacityGLPoint(64);
    ensureCapacityGLLine(256);
    
    if (Configuration::getInstance()->supportsShareableVAO())
    {
        glGenVertexArrays(1, &_vao);
        GL::bindVAO(_vao);
    }
    glGenBuffers(1, &_vbo);
    glBindBuffer(GL_ARRAY_BUFFER, _vbo);
    glBufferData(GL_ARRAY_BUFFER, sizeof(V2F_C4B_T2F)* _bufferCapacity, _buffer, GL_STREAM_DRAW);
    // vertex
    glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_POSITION);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, sizeof(V2F_C4B_T2F), (GLvoid *)offsetof(V2F_C4B_T2F, vertices));
    // color
    glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_COLOR);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_COLOR, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(V2F_C4B_T2F), (GLvoid *)offsetof(V2F_C4B_T2F, colors));
    // texcood
    glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_TEX_COORD);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_TEX_COORD, 2, GL_FLOAT, GL_FALSE, sizeof(V2F_C4B_T2F), (GLvoid *)offsetof(V2F_C4B_T2F, texCoords));
    
    if (Configuration::getInstance()->supportsShareableVAO())
    {
        glGenVertexArrays(1, &_vaoGLLine);
        GL::bindVAO(_vaoGLLine);
    }
    glGenBuffers(1, &_vboGLLine);
    glBindBuffer(GL_ARRAY_BUFFER, _vboGLLine);
    glBufferData(GL_ARRAY_BUFFER, sizeof(V2F_C4B_T2F)*_bufferCapacityGLLine, _bufferGLLine, GL_STREAM_DRAW);
    // vertex
    glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_POSITION);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, sizeof(V2F_C4B_T2F), (GLvoid *)offsetof(V2F_C4B_T2F, vertices));
    // color
    glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_COLOR);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_COLOR, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(V2F_C4B_T2F), (GLvoid *)offsetof(V2F_C4B_T2F, colors));
    // texcood
    glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_TEX_COORD);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_TEX_COORD, 2, GL_FLOAT, GL_FALSE, sizeof(V2F_C4B_T2F), (GLvoid *)offsetof(V2F_C4B_T2F, texCoords));
    
    if (Configuration::getInstance()->supportsShareableVAO())
    {
        glGenVertexArrays(1, &_vaoGLPoint);
        GL::bindVAO(_vaoGLPoint);
    }
    glGenBuffers(1, &_vboGLPoint);
    glBindBuffer(GL_ARRAY_BUFFER, _vboGLPoint);
    glBufferData(GL_ARRAY_BUFFER, sizeof(V2F_C4B_T2F)*_bufferCapacityGLPoint, _bufferGLPoint, GL_STREAM_DRAW);
    // vertex
    glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_POSITION);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, sizeof(V2F_C4B_T2F), (GLvoid *)offsetof(V2F_C4B_T2F, vertices));
    // color
    glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_COLOR);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_COLOR, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(V2F_C4B_T2F), (GLvoid *)offsetof(V2F_C4B_T2F, colors));
    // texcood
    glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_TEX_COORD);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_TEX_COORD, 2, GL_FLOAT, GL_FALSE, sizeof(V2F_C4B_T2F), (GLvoid *)offsetof(V2F_C4B_T2F, texCoords));

    glBindBuffer(GL_ARRAY_BUFFER, 0);
    if (Configuration::getInstance()->supportsShareableVAO())
    {
        GL::bindVAO(0);
    }
    
    CHECK_GL_ERROR_DEBUG();
    
    _dirty = true;
    _dirtyGLLine = true;
    _dirtyGLPoint = true;
    
#if CC_ENABLE_CACHE_TEXTURE_DATA
        // Need to listen the event only when not use batchnode, because it will use VBO
        auto listener = EventListenerCustom::create(EVENT_RENDERER_RECREATED, [this](EventCustom* event){
       /** listen the event that renderer was recreated on Android */
            this->init();//此处会一直添加监听，重复添加
        });

        _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);
#endif
    
    return true;
}