Hello! The MAME core (not the MAME “year” cores) seems to always use a software renderer. According to MAME’s docs, GL and D3D are valid options, but I don’t see where this can be specified. I’ve looked at retroarch-core-options.cfg and the individual default.cfg / .cfg options in savefiles\mame\cfg but none of them provide what I’m looking for.
I’ve also tried setting the retroarch video driver from vulkan, to gl, and d3dX and it has no effect. Is it just that MAME on libretro is only capable of software rendering?