What .love you are referring to: MV Platformer or BWE? In both cases setShape function is never called. Tried MV Platformer with LÖVE 0.10.0 (adapted several functions including stencil related) and it works (all is clipped to rectangular region in the top left corner). If this is not what is needed...

Good then! Tomorrow I'll try to make test suite for this problem.
I'm especially interested in creating custom mipmaps for atlases (on the fly, of course, using scaling).

Images don't use mipmaps in LÖVE though, unless you explicitly enable them. Hm, thought SDL generates them automatically anyways. Scaled image's quality is good enough in LÖVE which I'm not sure is possible without mipmaps. And I have problems with texture atlas with borders' padding when scaling. ...

Modern GPUs have another technique that can get around the problems inherent to texture atlases: Array Textures . However Array Textures require a modern GPU as well as custom shader code in order to use, so it might be challenging to integrate them into LÖVE in a clean and nice manner. Also, all a...

Such a leap of performance is suspicious. Could you provide .love?

EDIT: I can hardly believe that spritebatch drawing alone can cause this. Maybe you have some active shader which slows all down.

You can bake any effects to canvas, then draw this canvas like simple image.

I found that your map height is 52 tiles , but you try to index 53rd (y + mapY).
If you change your loop to for example: "for y = 1, #map - 1 do" then it will work as in first uploaded file.
But you say you can't run it too... Strange...

Leap of Time wrote:I couldn´t use any of them...?!?

Sorry, I meant the first one uploaded.

You already changed something. Previous .love was useable (without prints).

Leap of Time wrote:and the prints do nothing. (I think its because they are made for a console, and I don´t know how to open a .love with a console (I am using Windows!).

Use conf.lua for that. Set t.console = true. See here: Config Files