SNES/NES emulators locked to 8:7 aspect ratio in Native scaling

[abadai]

It currently doesn't seem possible to create an integer scaled image of SNES games while simultaneously maintaining a 4:3 aspect ratio. Native scaling forces 8:7 in all cases, and Aspect does not apply any integer scaling. Integer is preferable in order to apply even scanlines shaders. NES core also has the same problem.

Is it possible to specify separate aspect ratio and scaling options for these cores?

[tyblackwood]

This is a useful video for you to understand what is happening and why it can’t be fixed the way you’re asking, but there is a solution do your scanlines and shaders problem.

https://youtu.be/ssluTgfkdlg?is=dwsSUVUMmfpm1D2Z

It is a hardware limitation of the SNES and NES. There is no 4:3 integer because the resolution of the SNES is 256x225 8:7. Some emulators will stretch it to 4:3, but that is not integer, and requires interpolation.

Snes9x has a preferred aspect ratio setting which in my testing does nothing, so other emulators offer what you’re suggesting, but for NextUI and your immediate problem, I suggest a different shader that doesn’t have this issue.

You can use crt-perfect.glsl or crt-mini.glsl for a scanline shader that draws over the 4:3 output resolution rather than the internal resolution.

I’ve found crt-perfect.glsl and crt-mini are the best crt shader the Brick is capable of and I’ve developed a number of configs around stock.glsl at linear scale 2 and crt-mini to replicate NTSC signal paths from video input cables, stock linear 2x produces the soft image of RF and composite. Crt-mini linear alone is like S-Video, and Crt-perfect is like RGB, with personal tweaks to every setting for my own sense of perfection.