Please show off what crt shaders can do!

[scorpius.milo]

@shenglong

Hi,

This combination of shader is great, I still need to tweak my settings but the rendering is really nice I think.

Just that the TATE Mode seems to be broken (Final Burn Neo) with the glsl and slang shader

I must also try the parameter you gave for artecfacs with LUT

I think we should try to move towards such combinations unfortunately I do not know enough …

I still have to try in Sonic1 for dithering and the parameter for 3D games

It also remains the moire problem with curvature, I try what is mentioned here but without success

https://filthypants.blogspot.com/search?q=ewa+curvature

In any case a big thank you to you

[HyperspaceMadness]

Thanks for the link!

Something I wonder about is if people would like some tube reflection effect on the screen like what is shown in the shadertoy.

My experience with putting reflection on top of the tube through overlays has shown me that for my tastes any more than a slight reflection is very distracting while playing the games.

[Syh]

Yeah the reflection on the screen is distracting, mainly posted the link because a dynamic bezel seemed fancy and really useful for this. As if it worked well as a replacement we wouldn’t have to make multiple bezels for orientation and resolution.

EDIT: On the subject of moire mitigation, @hunterk I’ve been trying for the last week to add the moire mitigation code to crt-guest and can’t get it to work properly at all. The noise/static happens, but when I use curvature the screen has a blurred texture of the game I’m playing where it should be black (nothing) for the curve.

Also can’t get the masks to do the curvature thing. Some assistance would be greatly appreciated .

[hunterk]

Yeah, that’s the glow effect. You’ll have to apply the curvature to the glow, as well. The easiest way to do it is probably going to be to start off the fragment with something like:

vec2 moire_coord = Warp(vTexCoord);

And then replace all of the later vTexCoord instances with your moire_coord.

However, you very likely don’t want to curve your mask or apply the static to it. Masks are very finicky and need to line up with the monitor’s subpixels or they look very bad, so you want them applied at the very end.

[Syh]

Quick question, why does the moire mitigation in the repo do mask curvature then? Personally the one in the repo doesn’t (look like it) work(s) properly for me unless I have the mask curvature enabled.

EDIT: Sorry, I sound rude. I’m asking this because I’m curious .

[hunterk]

I probably just couldn’t think of any other way to do it, but if you have the option to do it without curving, you should /shrug

EDIT: actually, it doesn’t look like the mask is curved:

Mask(vTexCoord.xy * global.OutputSize.xy * 1.000001)

That would have been Mask(pp * global.OutputSize.xy * 1.000001) if it were curved/static-ed, which makes a bunch of RGB noise.

[Syh]

This is from moire-resolve.slang from the repo.

vec2 pp = moire_resolve(vTexCoord.xy);
vec2 cc = Warp(pp);

FragColor.rgb *= Mask(((params.mask_curvature > 0.5) ? vTexCoord.xy : cc) * params.OutputSize.xy * 1.000001);

Edit: When I’m using this version of the shader, the moire static is fairly thick and noticeable, but when mask curvature is enabled via shader parameters, the moire static kinda focuses on the moire instead of the whole screen. At least that’s how it visually looks to me.

[hunterk]

Ah, I was looking at the ‘resolve’ pass from the glow shader. Yeah, I should probably get rid of that conditional and just always do the unjiggered vTexCoord.

[Syh]

I’d at least advise testing it before removing it, as it does a nice job at minimizing/removing visible moire. Also if you’re editing that shader would you change the lable for moire test (user parameter) into something like moire toggle idk. It just seems like a debug feature being named test lol.

EDIT: Thanks for the help and explanation!

[Nesguy]

My new shader preset. Just trying to dial in the sharpness; I think this is about right. Trying to match a 500-600 TVL shadowmask.

As always, I have my LCD backlight cranked to 100% when adding any kind of mask and/or scanlines. The images below will be too dark unless you’re cranking up the backlight and using an LED-lit LCD (really any LCD within the last 5 years will do).

alias0 = ""
alias1 = ""
BRIGHTNESS = "1.000001"
filter_linear0 = "false"
filter_linear1 = "true"
float_framebuffer0 = "false"
float_framebuffer1 = "false"
GAMMA_INPUT = "2.400000"
GAMMA_OUTPUT = "2.200000"
GLOW_DIFFUSION = "0.000000"
GLOW_HALATION = "0.000000"
GLOW_HEIGHT = "0.500000"
GLOW_WIDTH = "0.500000"
LUTHeight = "2.000000"
LUTWidth = "2.000000"
MASK_COLORS = "2.000000"
MASK_SIZE = "1.000000"
MASK_STRENGTH = "0.000000"
mipmap_input0 = "false"
mipmap_input1 = "false"
overlay = "C:\Program Files\RetroArch\shaders\shaders_glsl\reshade\shaders\blendoverlay\aperture_1_2_bgr.png"
overlay_mipmap = "false"
overlay_wrap_mode = "clamp_to_border"
OverlayMix = "0.500000"
parameters = "SHARPNESS_IMAGE;SHARPNESS_EDGES;GLOW_WIDTH;GLOW_HEIGHT;GLOW_HALATION;GLOW_DIFFUSION;MASK_COLORS;MASK_STRENGTH;MASK_SIZE;SCANLINE_SIZE_MIN;SCANLINE_SIZE_MAX;SCANLINE_SHAPE;SCANLINE_OFFSET;GAMMA_INPUT;GAMMA_OUTPUT;BRIGHTNESS;OverlayMix;LUTWidth;LUTHeight"
scale_type_x0 = "source"
scale_type_y0 = "source"
scale_x0 = "5.000000"
scale_y0 = "5.000000"
SCANLINE_OFFSET = "0.000000"
SCANLINE_SHAPE = "1.000000"
SCANLINE_SIZE_MAX = "1.500000"
SCANLINE_SIZE_MIN = "0.500000"
shader0 = "C:\Program Files\RetroArch\shaders\shaders_glsl\crt\shaders\crt-aperture.glsl"
shader1 = "C:\Program Files\RetroArch\shaders\shaders_glsl\reshade\shaders\blendoverlay\blendoverlay.glsl"
shaders = "2"
SHARPNESS_EDGES = "1.000000"
SHARPNESS_IMAGE = "2.000000"
srgb_framebuffer0 = "false"
srgb_framebuffer1 = "false"
textures = "overlay"
wrap_mode0 = "clamp_to_border"
wrap_mode1 = "clamp_to_border"

[Nesguy]

I think the above preset looks better at even integer scales (4x, 6x etc). Since the LUT is 2x2 pixels and the scanlines are 5 pixels wide, there’s a weird moire-like pattern in the above images. This raises the question: why don’t shadowmask CRTs exhibit this moire-like pattern with scanlines? It seems unlikely that the beam would always perfectly line up with the phosphors in such a way that this wouldn’t happen. Or maybe shadowmask CRTs do show the same moire-like pattern with scanlines and I’ve just never noticed.

edit: it’s not really moire per se; it looks like slightly uneven scanlines due to the fact that the phosphor arrangement in the scanline alternates with each adjacent scanline (this is difficult to explain).

So, the aperture grille pattern has the advantage of looking better at odd integer scales, since the phosphor arrangement is the same with each scanline (again, difficult to explain).

Edit: Okay, this is one of those things that’s just easier to explain with pictures.

The problem is that you have two scanline/phosphor patterns that alternate between each other, which tricks your eyes and gives the illusion of uneven scanlines (at least, it does for me). Does anyone know if shadowmask CRTs did the same thing? If not, why not?

2nd edit: Is this just all in my head? I need a nap.

Here’s an example of the same preset at 4x:

[ProfessorBraun]

If you use a 2x2 png with blendoverlay like shadowmask effect,you will need to change shader scale 0 5x to 4x (crt-aperture passes ).

ex: 4x

ex: 5x

[Nesguy]

Changing the shader scale from 5x to 4x made the problem(?) even more apparent on my display; I’m using a 1080p display and a custom 6x5 integer scale. 3x shader scale looks even worse.

There are a lot Xs here, so to clarify the above images, the first SMB shot is 6x5 custom integer scale with shader scale 0 at 5x, the second SMB shot is 5x4 custom integer scale. They’re all at 5x shader scale for shader 0.

I think the issue is unavoidable with odd-numbered vertical integer scales. You could use a 5x5 LUT (with a 6x5 integer scale), but then the mask texture wouldn’t look right. Curses!

[ProfessorBraun]

I think the issue is unavoidable with odd-numbered vertical integer scales

When I went from 1080p to 2160p, I only had to tick the integer scale parameter in retroarch and it made my life easier . The prices of some good screens are becoming more and more affordable. It may be time to buy uhd screen in 2020 !

Edit! maybe i found a solution for your preset,wait a minute

Edit 2 : ok change this

scale_type_x0 = “source” scale_type_y0 = “source” scale_x0 = “5.000000” scale_y0 = “5.000000”

with this

scale_type_x0 = “absolute” scale_x0 = “1920” scale_type_y0 = “absolute” scale_y0 = “1080”

[Nesguy]

Nope, that’s even worse lol.

It’s an inevitable consequence of using an odd-numbered integer scale with the checkerboard pattern. There’s no way to avoid an alternating pattern with the scanlines. To test this, try any odd numbered integer scale with the checkerboard pattern and scanlines and you’ll get the same result: seemingly uneven scanlines.

Thanks for trying though

Definitely time to upgrade displays!

This still leaves unsolved the mystery of why I don’t notice the same thing on actual shadowmask CRTs. Maybe I’ve just never looked close enough, or maybe the beam width is always an even number of phosphors wide, but that seems unlikely.

[BlockABoots]

Just been catching up on this thread (since Jan '19) and the work you guys have put in is truly amazing, big stand outs for me is HyperspaceMadness bezel reflection and Guest.r and Venoms shader!!!. On that note will HyperspaceMadness’s bezel effect be able to be added existing shaders as an option to enable and disable?

HyerspaceMadness, any plans to release a 1440p version?

So by the looks of this thread the top shaders are:

• crt-easymode

• crt-guest-dr-venom

• crt-aperture

• crt-hyllian

• crt-royale kurozumi

[ryuuji89]

I m loving the composite shader (analog pack) but would it be possible to enable an option where you can change the shadow mask opacity ?

[Nesguy]

semi-off topic:

Can anyone point me to some high quality macro shots of a 500-600 TVL shadowmask/dotmask CRT, showing the phosphor arrangement and scanlines? Seems like more than 95% of the photos I see are of aperture grille CRTs.

[Syh]

Maybe… Could you possibly link the shader or code-block post it here (copy and paste the shader with the mask with “```” at the top and bottom of it without the " ")?

[Syh]

@BlockABoots HyperspaceMadness’s currently posted shader is built on top of crt-guest(still really nice additional work though), the next version should be a standalone shader (at least from what I understood, please correct me if I’m wrong though).

Although if the shadertoy shader I linked works out for him, we may not need to worry about bezel resolutions (at least from what I was understanding of the code).

I feel like that list of shaders is pretty accurate, .