Do custom viewports work in batocera? Can it be done per game?

willmatic

Hi,

First post so excuse if I’m asking in the wrong place.

I would like to know if I can set custom viewports, specifically for PS1.

Problem:

Most cores look incredible in ‘square pixels’ with integer scaling.

PS1 however, has some unique resolutions – one being 512×240 (Crash Bandicoot etc.)

Would it be possible to set a custom viewport that scales the video with whole numbers, to 1024×720. This would be exactly 2x(w) * 3x(h). It’s still nearly the same as 4:3 ratio, but avoids smushed pixels. My screen would be set to 1280×720 btw.

Obviously this would work best if you could set this per game. I can see a ‘custom’ option on my Pi4 (Batocera 33), but no way of defining.

Many thanks!

Atari

Yeah just make your own bezel with the custom viewport. Put it into the decorations/ folder when you’re done.
Alternatively, just turn off bezels and integer scaling will give you the 1:1 image.

willmatic

Atari

Hi thanks. 1:1 didn’t do it, but I looked at the retroarchcustom.cfg file and changed my values to:

custom_viewport_x = 0

custom_viewport_y = 128

custom_viewport_width = 1024

custom_viewport_height = 720

Now I have all my 320×240 games (Rayman etc.) set to ‘core provided’ - Batocera will scale them perfectly to 960×720 on my TV.

And I can set the 256×240 and 512×240 games to ‘custom’ and they will scale by whole numbers to 1024×720.

Great result. Graphics look much cleaner. Street Fighter EX Plus Alpha looks especially amazing.

willmatic

Atari this is what the game looks like with square pixels and integer scaling - because the games internal resolution is very wide (512×240) it can only double to x2 (1024×480) - and obviously retains it’s very wide ratio.

This is with 4:3 scaling…

On a 720p display the 4:3 image is zoomed to 960×720. The result is squashed and irregular sized pixels.

A simple change to 1024×720 restores the image geometry.

Hope this helps. There are settings in duckstation in batocera to define custom resolutions, but they are reset each time you load a new game. What batocera needs is a way to define custom resolutions per game, for consoles that use multi resolutions/ratios - like PS1, Saturn etc.