After talking about it with a few friends I decided to post it here and hopping someone can help out.
I know there’s a scanline shader in the misc folder but that won’t multiply correctly at 4k. I’m looking for something that can be multiplied by 8x or more, using integer scaling. I don’t mind black bars on top and bottom. What I’m looking for is a shader that can draw a black line every X lines, according to the multiplier so it will draw it exactly were a 240p CRT would draw it.
I tried every CRT shader disabling everything and just leaving scanlines without success. Some causes artifacts, some cause blurriness and bleeding on the scanlines from the top and bottom line. Overlays won’t work properly as far as I can tell because it needs to figure it the multiplier.
The OSSC does it perfectly. The Framemeister does it the wrong way, that’s why I’m asking for a OSSC like x5 scanlines. What I mean is, if you multiply a 240p source you will get big block pixels that will take 9 lines in a 4k display. The line is supposed to be drawn after the 9th line. What I’m not sure is how many lines the scanline should occupy. Some shaders will draw it between each line causing a weird scanline effects.
What would be awesome to have is pixel sharp image, without any kind of deterioration and correctly placed scanlines.