Location of template rendering in Symfony2

Where in Symfony2 is template rendering launched?

I am asking for the most general class/method handling the template logic, I guess by launching the configured template engine, like Twig 开发者_运维技巧for example.

Or to put the question even more concretely ... a controller delegates the layout to a specific template, like example.html.twig ... where is this filename used and passed for the first time?

---

In the most general case, assuming you're using the FrameworkBundle (if you're using Standard Edition, you are), the render function just calls $this->container->get('templating')->renderResponse, just passing along the parameters.

Engines (like the twig engine) implement Symfony\Component\Templating\EngineInterface.

You can check out vendor/symfony/src/Symfony/Bundle/FrameworkBundle/Controller/Controller.php (and the other relevant files, like the ones in the TwigBundle), if you'd like to take a close look at how it works.