Tilemap : drawing out of window

[Lo-X]

Hi,

I've just a simple question : I've a tilemap that is bigger than the window (the view has a viewport equal to window size) and I render it every frame. What happen to things that are out of the window ? Are they rendered too by GPU or is it automatically skiped ?

[binary1248]

The data is transferred to the GPU and it will look at it and find out that it isn't allowed to render some primitives which lie outside of the clipping area. In that sense, yes they are automatically skipped, but if your tilemap is large enough, you will notice a considerable performance drop because you are transferring a lot more data every frame than you need to. If you can, decide what will really be seen on screen and only draw that. If needed, you might want to split your tilemap up into multiple pieces for this, or even construct the visible portion anew every frame.

See: http://en.sfml-dev.org/forums/index.php?topic=12349.0

[Lo-X]

Very helpful, thank you =)