Cropping black borders?

[Jamirus]

This looks just like the dynamic overscan question that was brought up once. How is MAME standalone supposed to handle that anyway? It doesn’t look like it does so by default.

[QQQ]

@hunterk

If you need to add a scale type to a pass and there isn’t one there already, you can just add that line: scale_typeX = “whatever”. ‘Source’ is the default for all passes except the final pass, which defaults to viewport (to stretch the image to fit the screen).

“whatever” isn’t an actual command right? Just need to be sure.

I also see that there is a “scale_typeY” setting in the preset file. Should it have the same value as the “scale_typeX” setting?

@hunterk

So, with the second strategy, you’re basically recreating the last pass’ automatic behavior in the second-to-last pass (i.e., so the effect looks right) and then slapping the image-adjustment shader on top to modify it. This may not be what you want: for example if you have a CRT curvature effect, your cropping won’t crop the game, it’ll crop the virtual screen bubble.

Could you please show how to do this in the preset I shared above?

@hunterk

Note: this information is all contained in the slang shader spec document, which is available from the repo’s README.

I found this:

libretro/RetroArch/blob/master/README.md

But couldn’t find this information anywhere in it.

[hunterk]

This is the spec doc:

libretro/slang-shaders/blob/master/README.md

“whatever” isn’t an actual option, no. It’s source, viewport or absolute. The X wasn’t an actual X there, either. It was intended as a variable. If you do scale_type0 = “source”, it’s going to apply source to both X and Y axes. if you do scale_type_x0, it’s just the X axis. scale_type_y0, it’s just the y axis.

[QQQ]

I did manage to find this doc too but I couldn’t find any explanation about Shader Scale and Shader Filter in it. Maybe it’s because it’s not in a language that someone like myself could understand easily.

Anyway, this is how I did it: https://pastebin.com/CTC0CUiZ

Please verify if it’s correct. The preset seems to load fine. Shows 1x Scale for the second-last shader, fast-sharpen. The image-adjustment values are both shown as Default.

[hunterk]

that looks right to me