qda
@qda
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I've never seen a CRT shader I liked, so I made one (for ShaderGlass @mausmoto). It was inspired by @NOTimothyLottes "energy conservation" concept on shadertoys. - No brightness loss!!! - presets for 224/240p - parameters to tweak stuff - defaults are good for 4k output.
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The "shadow mask" effect has little to do with how shadow masks actually work, it just swaps pixels around horizontally.
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There's an optional auto-adjusting "number of scanlines rounding" feature which works well for 3d games and allows for scanlines to be a multiple of output resolution, lessening likelihood of moire or horizontal jailbars.
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Concessions are made for the sake of image quality and brainfeel rather than accuracy. As mentioned the scanlines gaps are thinner in bright areas because a SDR digital display cannot compete with the amount of energy coming from a single scanline on a CRT.
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This shader works very well to clean up super compressed youtube videos too! It's sort of a reverse-AA happening, since we know that in these high-resolution or bilinear scaled videos there are solid fat pixels underneath. This low quality video looks a lot better with the shader
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One thing I dislike about many ShaderGlass shaders is too many parameters. I've tried to edit mine down to just the essentials. The important setting to set is the 224/240p toggle, depending if you're playing SNES for example. The others have explanations.
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Scanlines alone help 240p content, but CRTs add additional texture. Instead of trying to simulate a shadow mask, which I find messes up chroma/luma, I just refract subpixels horizontally to create mask-like noise without having to process and affect color, or simulate phosphors.
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Per Tim Lottes' concept, the shader redestributes the energy found in the original 'fat' pixel rows into a thinner scanline. But due to clipping at high values, we compensate by thickening the scanline (sometimes called adaptive scanlines).
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The goal was to recreating what happens in our PERCEPTION and MEMORY when viewing on a CRT, rather than trying to simulate the literal visuals, which is technically impossible on a digital display.
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Releasing Downloader 2.2 & Update All 2.3.1! 🔥 #MiSTerFPGA will now run Downloader as a native binary, making updates faster than ever: 2X faster than a few of months ago! ⚡️ This one took a lot of work — and a lot of trial and error Public Post here:
patreon.com
Get more from theypsilon on Patreon
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Babe, wake up...
New service info for Ikegami HTM owners just dropped. There's a hidden geometry menu you can access by holding ESC for 5 seconds. More details at the bottom of this page:
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Unexpectedly, https://t.co/7bRMgnDQuy has ended. This was a decades-old nexus for romhacks, retro hardware documentation and fan translations. The database is now on the Internet Archive but it seems to not include author references, so it remains preserved, though ahistorical.
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Anyone in the market for an X86000 monitor in the US? I just finished repairing a Sharp CZ-607D 15/31Khz model that I need to sell. All of the important areas have been recapped. DM me if you're interested, won't be cheap due to import costs and recap labor. No stand included.
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I have developed an irrational sense of seething contempt for how movie trailers seem to want me to have some sort of holy reverence for popular hits/genre fare I saw decades ago
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Yes yes yes I've been wishing for something like this for #MiSTerFPGA for a while!
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I picked up a DE-10 Lite board naively thinking I could install a single core to it based on some Googling - I wanted a dedicated Groovy_Mame board for MiSTerCast. I don't have the brain allocation to figure out the possibility of porting the core, looking to donate it to someone
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