void RenderSystem::update(float delta, std::vector<std::unique_ptr<Entity>> &entities)
{
    delta = 0;
    for (auto i = entities.begin(); i != entities.end(); ++i) {
        if (((*i)->getComponentFlags() & m_mask) == m_mask) {
            Component* c = (*i)->getComponent(RENDER_COMPONENT);
            std::cout << "component ptr: " << c << std::endl;
            RenderComponent* r = dynamic_cast<RenderComponent*>(c);
            if (r != nullptr) {
                r->model.render();
            }
        }
    }
}