First at all, sorry for my bad english.
Now, what i want to do is... I create a render window, with... for example, 1024x576, that is 16:9, what can I do so when it switches to full screen, it scales mantaining the proportion and it stop when the width or heigh is filled, centring the image and filling the unoccuped space with black.
If i didnt explained it well, this is a graphic explanation:
(http://imageshack.us/a/img824/5562/55751741.png)
(http://imageshack.us/a/img11/2426/42486587.png)
(http://imageshack.us/a/img24/4197/99812100.png)
Greetings.