you have to do it yourself by rendering to a larger texture and then downsampling. something like the following patch (the gauss blur may or may not be desirable).

you could also try downsampling before the blur-pass (by inserting a jit.gl.texture @adapt 0, dims set to window size). not sure if that would yield better results or performance.

ok. thx a lot. could you please explain me why fsaa doesn't work ? it's a pity to have to make a larger texture. don't we lose fps ?

that's pretty much what fsaa does, so no, not losing fps. fsaa is a property of the window, not the texture. you can't perform the antialiasing if the geometry is already rendered to a texture.