Hey, I tend to play my 2D games with 1:1 pixel aspect ratio - and yes, I know that this is controversial and that games were technically designed for 4:3 monitors in the 80s and 90s, but to my eyes the majority of games look more “correct” with square pixels then when stretched or sqished to 4:3. I will die on that hill! Recently I switched from Beetle PSX to Duckstation in RetroArch and found that it is much more compatible with 1:1 PAR than the Mednafen core. The Beetle PSX and especially Saturn cores seem to have severe problems displaying games in PAR.
Anyway, while I really enjoy playing games like Parodius or SOTN in 8:7, some games on the PlayStation use a sort of ultra-wide aspect ratio that looks completely off in 1:1 PAR. For example Mega Man X6: the gameplay looks fine in 1:1 PAR (10:7 with overscan cropped in Duckstation), but the title screen and cutscenes use some sort of widescreen aspect ratio that looks off and distorted. I was wondering if it was possible to set a maximum resolution of 10:7 - so that everything that gets wider than this aspect ratio gets squished down to 10:7. I’m aware that this is not possible with RetroArch’s video settings, but is there a shader with which I can accomplish this? I know that this is an odd request, but hopefully someone can point me into the right direction anyway!