Mipmaps generation for atlases

[GraphFistaha]

Given a texture (as atlas) and you need to generate mipmaps for it.
You can't just generate mipmaps because of visual artifacts (neighbour images are overlapping each other).
So you need to generate mipmaps for each image of atlas by one.

Note, that texture can be layered (sampler2DArray)

[GraphFistaha]

Why it could useful?

I'm against of using bindless_texture extension because of robustless, so I want to adapt texture atlases for material texture containing.
As I could figure out, texture atlasses doesn't work with mipmaping, so can be used only for UI-textures, decals and so on.

[GraphFistaha]

Insert padding in texture atlas is useful, but what if I want to insert 2048 texture in 4096. If I used padding I had inserted only one texture in layer. But I want to safe memory and insert all 4 textures