@cinnamon@mk.absturztau.be and to clarify further: these are not CRT artifacts, these are composite NTSC artifacts. This is an important distinction - there's nothing about CRTs that produces artifacting, not all systems do this (e.g. Mega Drive, even tho it has the same horizontal resolution in 320 mode, doesn't, it does have artifacting but it's a subtle rainbow effect instead - see screenshots and there are tons of games that do this, tho usually for shading and not transparency) and it's significantly more difficult to do this with PAL (tho still possible).
I have more examples of intentional composite fuckery:
SNES frequently does dithering as well in high res and pseudo high res modes (no artifacting - there is diagonal striping but it alternates every field as SNES averages artifacts out like that, same as NES).
Shinobi on Sega Master System turns dithered warehouse backgrounds into a weird roller effect. This one I actually can't fully reproduce - there should also be red discoloration which I don't have, see https://www.youtube.com/watch?v=qLWZoEgjNnU
Saturn also does dithering Mega Drive-style, tho it looks exactly the same so not very interesting.
PlayStation does dithering as well - it can display more colors at once, it's just slower to calculate them so lots of games resort to dithering
All of this is just due to composite, it comes through just as well on an LCD with composite input - CRT only adds visible scanline separation from displaying 240p without alternating fields, curvature and phosphor dots. This specific shader also adjusts colors a bit (you can see it's a bit bluer) tho I should go through platforms and turn that off for the ones wher the color is already adjusted.
What I don't handle well rn is PAL - there's very little info online about this kind of stuff on PAL systems, and the only available shaders does NES-style output (but unlike NTSC doesn't alternate artifacts between fields, so I don't even know if that's accurate), so fails on megadrive etc. Since there's so little info I don't dare to try and adjust it unlike with NTSC one, so for now it will have to remain inaccurate :neocat_pensive:
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