@dominodomino please ensure you fill out all of https://retropie.org.uk/forum/topic/3/read-this-first when requesting support.

a verbose log for when it works vs when it doesn’t would be useful. note that shaders aren’t save via overrides: https://retropie.org.uk/docs/Shaders-and-Smoothing/#installation

@Rion Thanks for the Feedback...
But as this was a rushed release, because of me trying to be helpfull, it has taken me a while to come up with the next step...

The VPCalc script itself was ready in the time I opened this topic, but me and readmes are only friends in context of me reading them, not writing such.... (and then, in (CP)2020 CP2077 came to be)... well, as life is passing by, instead of having the filter scripted and at least in beta stage by now, I may have that one ready in 202101/02 ... here we are with the viewport calculator: Project VPC: VPCalc at least. ...

As I had to use used some markdown/html patchwork to create the readme which is, so far and for now, working on git, but unusable here.... I am only providing the link for now...

Edit: And a look at the UI:
VPCalc-UI

Besides me living in Night City at the moment, the UI for the filtering App/Script is in its alpha and ready to be populated/used by/with further scripting.... sneak preview:

VPC_DatFilter.png

Emulationstation accepts the --screensize <width> <height> parameters so it might work to start it in a viewport without mocking with the overscan bands on the display. This, in combination with the RetroArch viewport settings, might enable you to run everything in a custom viewport.
Of course, you might have trouble with console script (i.e RetroPie Setup or any other scripts) and with non-Libretro emulators.

EDIT: you might need to also add --screenoffset <offsetX> <offsetY> in addition to --screensize to position the viewport.

@Ronoh55
FYI - think your issue with this one would be wrong quote signs used. eg:

custom_viewport_width = “960” custom_viewport_height = "720”

note the different types of quote signs you’ve used around the numbers. only the vertical ones are right - " - not the slanted type. in fact, i’m not sure you need quotes around things like the aspect ratio index, but check an existing config to be sure.

Hmm... I recently updated as well and am seeing that my overlays now stretch over onto the game display when they didn't used to. But I am not using the aspect ratio indexing at all.

My Frogger cfg for example:

input_overlay = /opt/retropie/emulators/retroarch/overlays/arcade-bezels/Final_Arcade_Frogger.cfg input_overlay_enable = true input_overlay_opacity = 0.900000 input_overlay_scale = 1.000000 video_shader_enable = "true" video_shader = "~/.config/retroarch/shaders/crt-pi-curvature-vertical.glslp"

@Rion Here you go !
Based on your list, FBA .39 resolutions calculated and added to Resolution Database: this is the updated link for download.
Added you in the readme file as source of the list ;-)

Some items in your list were not recognized by the program: for some of those I was able to find and add data manually, with some others no luck (e.g. 1942c64... *demo ... *frog ... *drumkit..). FBA resolution db still provides display info for 4132 games !