I finally understood and made my own converter (not complete but it does what I needed)

https://github.com/cosmo0/mame-retroarc ... -converter

Hello I'm trying to automate the porting of OrionsAngel's amazing MAME overlays (see here: https://forums.libretro.com/t/my-realistic-arcade-bezels/10604/ ) to Libretro overlay configs (which are much more basic), and for that, I need to understand the LAY files. From what I can see, the Mame overla...