void updatePortProcessItems()
    {
        if (!postProcessItems.empty())
        {
            Material::setCurrent(0);

            IVideoDriver* driver = IVideoDriver::instance;
            driver->setState(IVideoDriver::STATE_BLEND, 0);
            spNativeTexture prevRT = driver->getRenderTarget();

            for (size_t i = 0; i < postProcessItems.size(); ++i)
            {
                spTweenPostProcess p = postProcessItems[i];
                p->renderPP();
                p->getActor()->releaseRef();
            }

            postProcessItems.clear();
            driver->setRenderTarget(prevRT);
        }

        _rtm.update();
    }