A high res blending option that makes the fake transparency in Kirby's Dreamland 3 into a real looking one like Higan's "blur emulation" option would be cool to have here. To do that properly you'd also have to be able to disable or downscale high res mode in the Balanced profile like you can in the Higan core by setting a lower resolution. Right now the Mercury-Balanced profile automatically switches to high res mode when high res effects are used, which looks bad with CRT shaders.
I'm closing this since the current bsnes core can blend with it's blur emulation option and I think is faster than the old mercury cores with it's fast PPU.
A high res blending option that makes the fake transparency in Kirby's Dreamland 3 into a real looking one like Higan's "blur emulation" option would be cool to have here. To do that properly you'd also have to be able to disable or downscale high res mode in the Balanced profile like you can in the Higan core by setting a lower resolution. Right now the Mercury-Balanced profile automatically switches to high res mode when high res effects are used, which looks bad with CRT shaders.