Beat you by 2 weeks in that department (and the video):
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Are you competing for seeing who published the video before?? 
Rainbow v3.0 for Sega genesis this time buddies.
Ok so this time took another Composite sample to make another variant… This one looks almost the same to me but can’t manage to turn blue a bit lighter. If you got any ideas about another shader to incorporate, I’d appreciate it.
left side is cutted video from real sega genesis composite connection vs Genesis plus GX rainbow danny v3.0. Source video is: https://www.youtube.com/watch?v=j-G02cjXpZ0 >> Thanks to it’s author for this sample.
v3.0 rainbow (fixed up now with the correct preset file):
new update: This 2nd video may show them off better:
Rainbow is noticable in sonic&tails presentation text, now it seems that rainbow may be a bit more accurate than previous versions.
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Nah mate…
Just pointing out that we’re both on the same boat of seeking that “Perfect Resource-light CRT Shader”. 
Granted, I’m looking for a PAL, and you’re probably looking for an NTSC one (I don’t know where you live), but we’re both still looking for one non-the-less.
Besides, call me out after you’ve tried this new version of the Rainbow Shader, I know I will.
I’m more surprised that there aren’t any Russian or French users on this forum looking for a SECAM one…
Looks great, I might just give this version a try…
You ought to get that requested to be included in the official repository…
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Tbh, the French and Russian users are more likely to just build their own shader (and post it on whatever forums they’re using ATM) 
Moreso the Russians, j/s
The irony of it is that SECAM is almost exactly like PAL.
The only real difference being the colour processing spectrum both systems were using.
They usually fixed this by selling PAL games in those areas with a special PAL-SECAM Converter for their television sets.
It looked something like this:
I tried to run the shader (the 3.0 version), but it just says “Failed to apply shader preset”
Did I miss a step?
good day there buddy. Just place it in shaders folder and load the preset. It shouldn’t have any trouble. Did you do that ? And set your video driver to vulkan or opengl.
My video driver is DirectX11.
No Vulkan support, and OpenGL support is terrible.
I’m happy to release now Rainbow for sega v4.0(+v4.1). It looks very similar to the video samble. Hope you enjoy them guys. Preset is for genesis plus gx and not blastem (rainbow will be unacurrate).
Big thanks to it’s original author for uploading the sample:
Left side is a Genesis console model 2 and right side is Genesis Plus GX
You can see the beautiful rainbow colors around the letters on first picture from Sonic & Tails text presentation.
Preset variants v4.0 and v4.1 available in:
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Unfortunately these preset variants only may work with .slang (vulkan or glcore). Is your GPU so old ? I have a modest graphics card and can run vulkan with no problem. video -> output -> driver -> vulkan or glcore …
My bad I just confused a bit. I meant glcore but not opengl
I use PicoDrive with the Dx11 Video Driver.
By default, all .slang shaders should work with DirectX too, but for some reason it won’t load.
Have you tried it this way yourself?
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Those are for Genesis plus gx and some of them for BlastEm. I haven’t tried out picodrive almost anytime since I get some a bit annoying audio crackling.
The low-pass filter in the options menu helps mask out the “cracking”. Assuming you haven’t tried any of the newer versions.
But other than that, I use it because it’s a lot more accurate than “G+GX”.
The issue with BlastEm is that it’s limited to Vanilla Genesis/Mega Drive only.
You can’t play any games utilising enhancement chips, or any of the CD/32x games on it.
I do not get the audio crackling anymore, thanks anyway. I haven’t used that core in quite a long time.
The presets work all good in picodrive as well. But like I said, one of the admins told me that nvidia (GL) GPUs can work as well with vulkan so you should not have any trouble.
Don’t have a (dedicated) GPU, it’s purely Intel integrated.
I’m sorry for the mistake. I have confused myself with another file. Please take a look again in the rainbow v3.0 link. It should work now.
Hardly matters now with the new 4.0/4.1 version.
Wish me luck… Because it looks amazing on your end.
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Tried it again. It’s the same exact problem.
I even tried the new 3.0 you just linked.
Must be a hardware problem then…
Maybe it’s meant for systems with dedicated GPUs or something.
Oh well… 
Or maybe the issue is that I need a “shaders” folder with all of the .slang files present.
Assuming placing it in it’s own folder in the “shaders_slang” folder isn’t a wrong move…