Windowed borderless fullscreen

[Jack]

I'm using GroovyMAME with CRT_Emudrivers, there is a way to play in windowed borderless fullscreen mode? I need this so show things on "always on top" on top of the game screen, if mame is fullscreen and i try to show things on top of the game mame loses focus.. Thanks for the help.

EDIT: I didn't managed to make it borderless etc but i managed to do what i wanted with a shader.. so i don't need that anymore but i'll leave it for someone who might need it.

[Calamity]

If you've managed to do it with a shader it's definitely much better. Baseline MAME runs in borderless windowed mode by default with the bgfx backend. GM uses exclusive fullscreen for both d3d and bgfx, because borderless windowed mode is known to add latency.