Please show off what crt shaders can do!

Squalo · 17 March 2020 20:29

@Nesguy - great results, the blur is spot on. But I can’t see the grill, how come? Did you give up on masks for good? Also, color temperature too warm as usual

@Mickevincent - no shadowmask, high and obviously interpolated resolution, too strong and misaligned scanlines. Not a very natural result honestly. I know too well that getting the lines right with reshade is a major pita. You might want to try matsilagi’s ports of the RA shaders, they work very well. I also suggest you go hunting for screens of actual N64s (since you seem to be very fond of that system) running on crts and try to replicate that. It won’t be easy haha but that’s why we are here is it not?

@c9f5fdda06 - I much prefer a black background, but the image itself looks fantastic. Is it guest?

Syh · 17 March 2020 20:59

Here’s your answer for @Nesguy.

And @c9f5fdda06 image is with a modified version of guest-dr-venom you can find in the link he posted.

@Nesguy I do have a question about that post though, is there a reason you’re using an older version of that shader? Also why are you using two stock passes?

c9f5fdda06 · 17 March 2020 21:53

I requested this shader because it helps ensure even wear on my display (OLED). You will find a link to my request in my original post that shows I wanted guest + border glass/blur.

Nesguy · 17 March 2020 23:36

@Syh No real reason, I just need to update my shaders. I replaced the first two passes with stock because it was color-related stuff that I wasn’t using anyway.

@Squalo Thanks for the feedback! Since my emulation PC is using a different input on my TV I just set it to a cooler temperature on that input. You’re right that a cooler temp is better for most 240p stuff once your eyes adjust to it.

This plasma TV does some kind of temporal dithering to get bright enough, so masks are out of the question, which is too bad. On the other hand, the plasma uses the same phosphors as a CRT, so the glow and color reproduction are amazing.

Nesguy · 17 March 2020 23:40

@Mickevincent

N64 is a tough nut to crack, since the hardware did its own antialiasing and filtering.

Speaking of which… has anyone made a shader specifically to replicate whatever the N64 hardware does?

Dogway · 18 March 2020 01:25

Unles you have access in shaders for the ZBuffer I find it hard to replicate exactly, but I made a proposal at raster level here. It still has to be coded/ported though.

Nesguy · 18 March 2020 03:47

That example looks really nice. What needs to be ported? This?

github.com

tp7/RgTools/blob/master/RgTools/rg_functions_c.h

#ifndef __RG_FUNCTIONS_C_H__
#define __RG_FUNCTIONS_C_H__

#include "common.h"
#include <xutility>
#include <algorithm>  
#include <utility>


typedef Byte (CModeProcessor)(const Byte*, int);

RG_FORCEINLINE Byte rg_mode1_cpp(const Byte* pSrc, int srcPitch) {
    LOAD_SQUARE_CPP(pSrc, srcPitch);

    Byte mi = std::min (
        std::min (std::min (a1, a2), std::min (a3, a4)),
        std::min (std::min (a5, a6), std::min (a7, a8))
        );
    Byte ma = std::max (
        std::max (std::max (a1, a2), std::max (a3, a4)),

This file has been truncated. show original

Dogway · 18 March 2020 14:51

Yes, seems like only mode 22 which is what I used:

RG_FORCEINLINE Byte rg_mode22_cpp(const Byte* pSrc, int srcPitch) {
    LOAD_SQUARE_CPP(pSrc, srcPitch);

    Byte l1 = (a1 + a8 + 1) / 2;
    Byte l2 = (a2 + a7 + 1) / 2;
    Byte l3 = (a3 + a6 + 1) / 2;
    Byte l4 = (a4 + a5 + 1) / 2;

    auto ma = std::max(std::max(std::max(l1, l2), l3), l4);
    auto mi = std::min(std::min(std::min(l1, l2), l3), l4);

    return clip(c, mi, ma);
}

EDIT: And to elaborate a little bit, this was my avisynth script. We have nnedi already so it’s feasible.

depoint(width/2,height/2) # to 240p
removegrain(22)
ConvertBits(8)
ConvertToYV24() # 4:4:4
nnedi3_resize16(width*2,height*2,lsb_in=false) # this is a mix for nnedi3 (edge area) and spline64 (flat area)

Nesguy · 18 March 2020 19:12

@guest.r

If you look closely you’ll see that there’s actually still a very faint mask in the shot I posted here, despite setting CGWG mask strength to 0.

Any idea why…?

guest.r · 18 March 2020 19:46

Yeah, the default mask bright value is a bit higher to compensate for brightness loss. You still get 1.1 and 1.0 combos with setting the strength to 0.0.

I was about to change it twice already, but it’s a nice compensation.

If you want no mask then mask ‘-1’ should be selected.

Mickevincent · 19 March 2020 03:14

Some N64 with angrylion. And crt

Nesguy · 22 March 2020 20:43

Increased bright boost and added a mask effect (mask type 7 in guest-dr-venom). Type 7 preserves brightness at the expense of “accurate” RGB intensity values for the phosphors. Bright boost is as high as it can go without clipping any colors.

shaders = "11"
shader0 = "shaders_slang/stock.slang"
filter_linear0 = "false"
wrap_mode0 = "clamp_to_border"
mipmap_input0 = "false"
alias0 = ""
float_framebuffer0 = "false"
srgb_framebuffer0 = "false"
scale_type_x0 = "source"
scale_x0 = "1.000000"
scale_type_y0 = "source"
scale_y0 = "1.000000"
shader1 = "shaders_slang/stock.slang"
filter_linear1 = "false"
wrap_mode1 = "clamp_to_border"
mipmap_input1 = "false"
alias1 = ""
float_framebuffer1 = "false"
srgb_framebuffer1 = "false"
scale_type_x1 = "source"
scale_x1 = "1.000000"
scale_type_y1 = "source"
scale_y1 = "1.000000"
shader2 = "shaders_slang/crt/shaders/guest/d65-d50.slang"
filter_linear2 = "false"
wrap_mode2 = "clamp_to_border"
mipmap_input2 = "false"
alias2 = "WhitePointPass"
float_framebuffer2 = "false"
srgb_framebuffer2 = "false"
scale_type_x2 = "source"
scale_x2 = "1.000000"
scale_type_y2 = "source"
scale_y2 = "1.000000"
shader3 = "shaders_slang/crt/shaders/guest/afterglow.slang"
filter_linear3 = "false"
wrap_mode3 = "clamp_to_border"
mipmap_input3 = "false"
alias3 = "AfterglowPass"
float_framebuffer3 = "false"
srgb_framebuffer3 = "false"
scale_type_x3 = "source"
scale_x3 = "1.000000"
scale_type_y3 = "source"
scale_y3 = "1.000000"
shader4 = "shaders_slang/crt/shaders/guest/avg-lum0.slang"
filter_linear4 = "false"
wrap_mode4 = "clamp_to_border"
mipmap_input4 = "false"
alias4 = ""
float_framebuffer4 = "false"
srgb_framebuffer4 = "false"
scale_type_x4 = "source"
scale_x4 = "1.000000"
scale_type_y4 = "source"
scale_y4 = "1.000000"
shader5 = "shaders_slang/crt/shaders/guest/avg-lum.slang"
filter_linear5 = "false"
wrap_mode5 = "clamp_to_border"
mipmap_input5 = "true"
alias5 = "AvgLumPass"
float_framebuffer5 = "false"
srgb_framebuffer5 = "false"
scale_type_x5 = "source"
scale_x5 = "1.000000"
scale_type_y5 = "source"
scale_y5 = "1.000000"
shader6 = "shaders_slang/crt/shaders/guest/linearize.slang"
filter_linear6 = "false"
wrap_mode6 = "clamp_to_border"
mipmap_input6 = "false"
alias6 = "LinearizePass"
float_framebuffer6 = "true"
srgb_framebuffer6 = "false"
scale_type_x6 = "source"
scale_x6 = "1.000000"
scale_type_y6 = "source"
scale_y6 = "1.000000"
shader7 = "shaders_slang/crt/shaders/guest/blur_horiz.slang"
filter_linear7 = "false"
wrap_mode7 = "clamp_to_border"
mipmap_input7 = "false"
alias7 = ""
float_framebuffer7 = "true"
srgb_framebuffer7 = "false"
scale_type_x7 = "source"
scale_x7 = "1.000000"
scale_type_y7 = "source"
scale_y7 = "1.000000"
shader8 = "shaders_slang/crt/shaders/guest/blur_vert.slang"
filter_linear8 = "false"
wrap_mode8 = "clamp_to_border"
mipmap_input8 = "false"
alias8 = "GlowPass"
float_framebuffer8 = "true"
srgb_framebuffer8 = "false"
scale_type_x8 = "source"
scale_x8 = "1.000000"
scale_type_y8 = "source"
scale_y8 = "1.000000"
shader9 = "shaders_slang/crt/shaders/guest/linearize_scanlines.slang"
filter_linear9 = "true"
wrap_mode9 = "clamp_to_border"
mipmap_input9 = "false"
alias9 = ""
float_framebuffer9 = "true"
srgb_framebuffer9 = "false"
scale_type_x9 = "source"
scale_x9 = "1.000000"
scale_type_y9 = "source"
scale_y9 = "1.000000"
shader10 = "shaders_slang/crt/shaders/guest/crt-guest-dr-venom.slang"
filter_linear10 = "true"
wrap_mode10 = "clamp_to_border"
mipmap_input10 = "false"
alias10 = ""
float_framebuffer10 = "false"
srgb_framebuffer10 = "false"
scale_type_x10 = "viewport"
scale_x10 = "1.000000"
scale_type_y10 = "viewport"
scale_y10 = "1.000000"
parameters = "WP;wp_saturation;SW;AR;PR;AG;PG;AB;PB;sat;STH;GAMMA_INPUT;TAPSH;GLOW_FALLOFF_H;TAPSV;GLOW_FALLOFF_V;TATE;IOS;OS;BLOOM;brightboost;brightboost1;gsl;scanline1;scanline2;beam_min;beam_max;beam_size;h_sharp;s_sharp;csize;bsize;warpX;warpY;glow;shadowMask;masksize;vertmask;slotmask;slotwidth;double_slot;mcut;maskDark;maskLight;CGWG;gamma_out;spike;inter;bloom"
WP = "0.000000"
wp_saturation = "1.000000"
SW = "0.000000"
AR = "0.070000"
PR = "0.050000"
AG = "0.070000"
PG = "0.050000"
AB = "0.070000"
PB = "0.050000"
sat = "0.100000"
STH = "0.700000"
GAMMA_INPUT = "2.400000"
TAPSH = "4.000000"
GLOW_FALLOFF_H = "0.000000"
TAPSV = "4.000000"
GLOW_FALLOFF_V = "0.000000"
TATE = "0.000000"
IOS = "0.000000"
OS = "1.000000"
BLOOM = "0.000000"
brightboost = "1.200000"
brightboost1 = "1.200000"
gsl = "2.000000"
scanline1 = "15.000000"
scanline2 = "23.000000"
beam_min = "1.000000"
beam_max = "1.000000"
beam_size = "0.000000"
h_sharp = "5.000000"
s_sharp = "0.000000"
csize = "0.000000"
bsize = "600.000000"
warpX = "0.000000"
warpY = "0.000000"
glow = "0.000000"
shadowMask = "7.000000"
masksize = "1.000000"
vertmask = "0.000000"
slotmask = "0.000000"
slotwidth = "2.000000"
double_slot = "1.000000"
mcut = "0.200000"
maskDark = "0.000000"
maskLight = "0.000000"
CGWG = "0.000000"
gamma_out = "2.200000"
spike = "2.000000"
inter = "400.000000"
bloom = "0.000000"
textures = "SamplerLUT1;SamplerLUT2;SamplerLUT3"
SamplerLUT1 = "shaders_slang/crt/shaders/guest/lut/sony_trinitron1.png"
SamplerLUT1_linear = "true"
SamplerLUT1_wrap_mode = "clamp_to_border"
SamplerLUT1_mipmap = "false"
SamplerLUT2 = "shaders_slang/crt/shaders/guest/lut/sony_trinitron2.png"
SamplerLUT2_linear = "true"
SamplerLUT2_wrap_mode = "clamp_to_border"
SamplerLUT2_mipmap = "false"
SamplerLUT3 = "shaders_slang/crt/shaders/guest/lut/other1.png"
SamplerLUT3_linear = "true"
SamplerLUT3_wrap_mode = "clamp_to_border"
SamplerLUT3_mipmap = "false"

Nesguy · 23 March 2020 07:01

@guest.r

Any suggestions for sharpening up black edges when using mask type 7? Also, are there any parameters for adjusting mask type 7? I’d like it if the mask was more visible over brighter colors (see example)

Does mask type 7 use magenta/green or does it just darken every other pixel? Just curious.

edit: here’s a good example (borrowed from another thread) using the same mask type, I think. The mask is visible except over the very brightest colors.

Syh · 23 March 2020 01:55

#pragma parameter mcut “Mask 5&6 cutoff” 0.2 0.0 0.5 0.05

I’m pretty sure it’s in RGB but idk I can’t really decipher those masks but yeah that’s the only setting for it. (Pretty sure, just checked the code block and that was the only adjustable thing I saw.

Which now that you brought this up, @guest.r shouldn’t this

 #pragma parameter mcut "Mask 5&6 cutoff" 0.2 0.0 0.5 0.05

Be this instead?

#pragma parameter mcut "Mask 5-7 cutoff" 0.2 0.0 0.5 0.05

guest.r · 23 March 2020 11:57

Mask 7 was a nice idea from Dr. Venom, i think he likes to use it with slotmask. Unlike mask 5&6 the ‘maskLight’ and ‘maskDark’ aren’t linked with it, only the ‘mcut’ parameter. In general i don’t agree with the idea to add 2 more (new) parameters only for this mask, but the code could be tweaked a bit.

Otherwise it explicitly darkens every other pixel. The magenta/green alternative is mask 5, which is also linked with ‘mcut’, ‘maskLight’ and ‘maskDark’ params.

Sharpening the dark edges could be hard though.

Yeah, it should state mask 7 also.

I’ll see if i could update the mask code, since some people seem to like it a lot.

Nesguy · 23 March 2020 22:12

The gaussian blur in guest-dr-venom looks great sans mask, but masks result in some rather unnatural looking dark edges.

OTOH, guest-sm looks great as long as you’re using the mask, but if you disable the mask it doesn’t look ideal. It also seems trickier to get brightness/contrast/color dialed in with guest-sm.

Since this plasma tv does temporal dithering to display all the possible colors (all plasmas do this), I’ve been interested in the results that are possible with just scanlines + beam dynamics + blur.

Here’s a generic low TVL look, with lowered sharpness and scanline strength. Kinda reminds me of a 20" Sanyo that I had at one point.

shaders = "10"
shader0 = "shaders_slang/crt/shaders/guest/lut/lut.slang"
filter_linear0 = "false"
wrap_mode0 = "clamp_to_border"
mipmap_input0 = "false"
alias0 = ""
float_framebuffer0 = "false"
srgb_framebuffer0 = "false"
scale_type_x0 = "source"
scale_x0 = "1.000000"
scale_type_y0 = "source"
scale_y0 = "1.000000"
shader1 = "shaders_slang/crt/shaders/guest/color-profiles.slang"
filter_linear1 = "true"
wrap_mode1 = "clamp_to_border"
mipmap_input1 = "false"
alias1 = ""
float_framebuffer1 = "false"
srgb_framebuffer1 = "false"
scale_type_x1 = "source"
scale_x1 = "1.000000"
scale_type_y1 = "source"
scale_y1 = "1.000000"
shader2 = "shaders_slang/crt/shaders/guest/d65-d50.slang"
filter_linear2 = "true"
wrap_mode2 = "clamp_to_border"
mipmap_input2 = "false"
alias2 = "WhitePointPass"
float_framebuffer2 = "false"
srgb_framebuffer2 = "false"
scale_type_x2 = "source"
scale_x2 = "1.000000"
scale_type_y2 = "source"
scale_y2 = "1.000000"
shader3 = "shaders_slang/crt/shaders/guest/afterglow.slang"
filter_linear3 = "true"
wrap_mode3 = "clamp_to_border"
mipmap_input3 = "false"
alias3 = "AfterglowPass"
float_framebuffer3 = "false"
srgb_framebuffer3 = "false"
scale_type_x3 = "source"
scale_x3 = "1.000000"
scale_type_y3 = "source"
scale_y3 = "1.000000"
shader4 = "shaders_slang/crt/shaders/guest/avg-lum.slang"
filter_linear4 = "true"
wrap_mode4 = "clamp_to_border"
mipmap_input4 = "true"
alias4 = "AvgLumPass"
float_framebuffer4 = "true"
srgb_framebuffer4 = "false"
scale_type_x4 = "source"
scale_x4 = "1.000000"
scale_type_y4 = "source"
scale_y4 = "1.000000"
shader5 = "shaders_slang/crt/shaders/guest/linearize.slang"
filter_linear5 = "true"
wrap_mode5 = "clamp_to_border"
mipmap_input5 = "false"
alias5 = "LinearizePass"
float_framebuffer5 = "true"
srgb_framebuffer5 = "false"
scale_type_x5 = "source"
scale_x5 = "1.000000"
scale_type_y5 = "source"
scale_y5 = "1.000000"
shader6 = "shaders_slang/crt/shaders/guest/blur_horiz.slang"
filter_linear6 = "true"
wrap_mode6 = "clamp_to_border"
mipmap_input6 = "false"
alias6 = ""
float_framebuffer6 = "true"
srgb_framebuffer6 = "false"
scale_type_x6 = "source"
scale_x6 = "1.000000"
scale_type_y6 = "source"
scale_y6 = "1.000000"
shader7 = "shaders_slang/crt/shaders/guest/blur_vert.slang"
filter_linear7 = "true"
wrap_mode7 = "clamp_to_border"
mipmap_input7 = "false"
alias7 = "GlowPass"
float_framebuffer7 = "true"
srgb_framebuffer7 = "false"
scale_type_x7 = "source"
scale_x7 = "1.000000"
scale_type_y7 = "source"
scale_y7 = "1.000000"
shader8 = "shaders_slang/crt/shaders/guest/linearize_scanlines.slang"
filter_linear8 = "true"
wrap_mode8 = "clamp_to_border"
mipmap_input8 = "false"
alias8 = ""
float_framebuffer8 = "true"
srgb_framebuffer8 = "false"
scale_type_x8 = "source"
scale_x8 = "1.000000"
scale_type_y8 = "source"
scale_y8 = "1.000000"
shader9 = "shaders_slang/crt/shaders/guest/crt-guest-dr-venom.slang"
filter_linear9 = "true"
wrap_mode9 = "clamp_to_border"
mipmap_input9 = "false"
alias9 = ""
float_framebuffer9 = "false"
srgb_framebuffer9 = "false"
scale_type_x9 = "viewport"
scale_x9 = "1.000000"
scale_type_y9 = "viewport"
scale_y9 = "1.000000"
parameters = "TNTC;CP;CS;WP;wp_saturation;SW;AR;PR;AG;PG;AB;PB;sat;lsmooth;GAMMA_INPUT;TAPSH;GLOW_FALLOFF_H;TAPSV;GLOW_FALLOFF_V;TATE;IOS;OS;BLOOM;brightboost;brightboost1;gsl;scanline1;scanline2;beam_min;beam_max;beam_size;h_sharp;s_sharp;csize;bsize;warpX;warpY;glow;shadowMask;masksize;vertmask;slotmask;slotwidth;double_slot;mcut;maskDark;maskLight;CGWG;gamma_out;spike;inter;interm;bloom"
TNTC = "0.000000"
CP = "0.000000"
CS = "0.000000"
WP = "0.000000"
wp_saturation = "1.000000"
SW = "1.000000"
AR = "0.070000"
PR = "0.050000"
AG = "0.070000"
PG = "0.050000"
AB = "0.070000"
PB = "0.050000"
sat = "0.100000"
lsmooth = "0.900000"
GAMMA_INPUT = "2.400000"
TAPSH = "1.000000"
GLOW_FALLOFF_H = "0.000000"
TAPSV = "1.000000"
GLOW_FALLOFF_V = "0.000000"
TATE = "0.000000"
IOS = "0.000000"
OS = "0.000000"
BLOOM = "0.000000"
brightboost = "1.000000"
brightboost1 = "1.000000"
gsl = "2.000000"
scanline1 = "7.000000"
scanline2 = "11.000000"
beam_min = "1.000000"
beam_max = "1.000000"
beam_size = "0.000000"
h_sharp = "3.500000"
s_sharp = "0.300000"
csize = "0.000000"
bsize = "600.000000"
warpX = "0.000000"
warpY = "0.000000"
glow = "0.000000"
shadowMask = "-1.000000"
masksize = "1.000000"
vertmask = "0.000000"
slotmask = "0.000000"
slotwidth = "2.000000"
double_slot = "1.000000"
mcut = "0.200000"
maskDark = "0.500000"
maskLight = "1.500000"
CGWG = "0.300000"
gamma_out = "2.200000"
spike = "2.000000"
inter = "300.000000"
interm = "1.000000"
bloom = "0.000000"
textures = "SamplerLUT1;SamplerLUT2;SamplerLUT3"
SamplerLUT1 = "shaders_slang/crt/shaders/guest/lut/sony_trinitron1.png"
SamplerLUT1_linear = "true"
SamplerLUT1_wrap_mode = "clamp_to_border"
SamplerLUT1_mipmap = "false"
SamplerLUT2 = "shaders_slang/crt/shaders/guest/lut/sony_trinitron2.png"
SamplerLUT2_linear = "true"
SamplerLUT2_wrap_mode = "clamp_to_border"
SamplerLUT2_mipmap = "false"
SamplerLUT3 = "shaders_slang/crt/shaders/guest/lut/other1.png"
SamplerLUT3_linear = "true"
SamplerLUT3_wrap_mode = "clamp_to_border"
SamplerLUT3_mipmap = "false"

Nesguy · 23 March 2020 22:31

Could some kind of edge detection be added to reduce the blur when a black line is detected? Just tossing out ideas for future development; I know I ask for a lot and I really appreciate the work you’ve done!

guest.r · 24 March 2020 06:32

It was already implemented as ‘Smart smoothing’, you can test it a bit in the fast version. I had to decide between ‘smart smoothing and’ advanced ‘substrictive sharpening’ and now the latter is implemented. If you really want sharp edges with high normal sharpness, then you can increase the ‘Substrictive Sharpness’ parameter range to like 2.0.

Tatsuya79 · 24 March 2020 12:16

You probably want gamma linear interpolation like crt-geom does it:
https://github.com/libretro/slang-shaders/blob/master/crt/shaders/crt-geom.slang#L72

Nesguy · 24 March 2020 17:35

@Tatsuya79

That looks great. Can you post settings for this shot?