Requesting the option to only draw every other (even or odd) scanline. The use case is for pre-line-multiplied content (particularly in 480p/720p/1080p).
For example: Axiom Verge on the Wii U contains 270p pixel graphics which are 4x multiplied by the console into a 1080p output. There is no way currently to use the OSSC to add a scanline on each of the 270 lines, but this proposed feature would allow it.
Note that the existing “Sl. alt interval” option does NOT accomplish this. The “Sl. alt interval” option does nothing for 720p and up source signals, and for 480p sources it seems (in line 2x mode only) to change from a scanline pattern of 10101010 to 11001100. I could imagine that was the desired behavior, but it does not satisfy the feature I’m requesting here.
Created an account just to say I’ve been hoping for a similar feature, but for columns ! ^^
Reason: in x4 and x5 the kind of CRT imitation we get is a look similar to that of high-TVL like monitors, not looking like standard definition consumer tellys.
So one would say “why not output in x3 if you want that ?”, and I would agree but in most cases the issue is that the display’s built-in scaling – unlike in x5 1080p mode on my compatible monitor which is 1:1 – easily creates ugly artifact/patterns.
The only way to mitigate the issue is by tweaking ADC but it means making the picture way too dark.
Optimized modes also aren’t fit for this, so it’s draw only every other scanline while in generic modes that’s needed.
For me it is the only thing that’s missing on the original OSSC.
(Yep I’ve been bothering marqs a few times about it on shmups some time ago. ^^ )