New CRT shader from Guest + CRT Guest Advanced updates

[sonkun]

This update came right on time as I was thinking I wanted my “8/16bit” presets a bit sharper. I did a little tweaking and came up with this, here’s a before and after pic.

Previous settings:

Here’s how it looks after tweaking:

I managed to mostly get it to where I can see the black outlines more around Link, grass, rocks etc but my question to you @guest.r is can I manage to make it even sharper using blend mode 1? I ask because if I start raising the sharpness more I notice details start to go missing on some objects. My ideal sharpness is the look Blend 0 gives but when using that mode I notice it makes certain effects like the transparency in Sonic 1 waterfalls look weird so I stick to Blend Mode 1. Here’s my settings so far, I may end up using these for my next update depending on your opinion.

shaders = "17"
shader0 = "shaders_slang/crt/shaders/guest/advanced/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/crt/shaders/guest/advanced/stock.slang"
filter_linear1 = "false"
wrap_mode1 = "clamp_to_border"
mipmap_input1 = "false"
alias1 = "StockPass"
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/advanced/afterglow0.slang"
filter_linear2 = "true"
wrap_mode2 = "clamp_to_border"
mipmap_input2 = "false"
alias2 = "AfterglowPass"
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/advanced/grade/pre-shaders-afterglow-grade.slang"
filter_linear3 = "true"
wrap_mode3 = "clamp_to_border"
mipmap_input3 = "false"
alias3 = "PrePass0"
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/advanced/ntsc/ntsc-pass1.slang"
filter_linear4 = "false"
wrap_mode4 = "clamp_to_border"
frame_count_mod4 = "2"
mipmap_input4 = "false"
alias4 = ""
float_framebuffer4 = "true"
srgb_framebuffer4 = "false"
scale_type_x4 = "source"
scale_x4 = "4.000000"
scale_type_y4 = "source"
scale_y4 = "1.000000"
shader5 = "shaders_slang/crt/shaders/guest/advanced/ntsc/ntsc-pass2.slang"
filter_linear5 = "true"
wrap_mode5 = "clamp_to_border"
mipmap_input5 = "false"
alias5 = ""
float_framebuffer5 = "false"
srgb_framebuffer5 = "false"
scale_type_x5 = "source"
scale_x5 = "0.500000"
scale_type_y5 = "source"
scale_y5 = "1.000000"
shader6 = "shaders_slang/crt/shaders/guest/advanced/custom-fast-sharpen.slang"
filter_linear6 = "true"
wrap_mode6 = "clamp_to_border"
mipmap_input6 = "false"
alias6 = "NtscPass"
float_framebuffer6 = "false"
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/advanced/convert-ntsc.slang"
filter_linear7 = "true"
wrap_mode7 = "clamp_to_border"
mipmap_input7 = "false"
alias7 = ""
float_framebuffer7 = "false"
srgb_framebuffer7 = "false"
scale_type_x7 = "source"
scale_x7 = "0.500000"
scale_type_y7 = "source"
scale_y7 = "1.000000"
shader8 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
filter_linear8 = "true"
wrap_mode8 = "clamp_to_border"
mipmap_input8 = "true"
alias8 = "PrePass"
float_framebuffer8 = "false"
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/advanced/avg-lum-ntsc.slang"
filter_linear9 = "true"
wrap_mode9 = "clamp_to_border"
mipmap_input9 = "true"
alias9 = "AvgLumPass"
float_framebuffer9 = "false"
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/advanced/linearize-ntsc.slang"
filter_linear10 = "true"
wrap_mode10 = "clamp_to_border"
mipmap_input10 = "false"
alias10 = "LinearizePass"
float_framebuffer10 = "true"
srgb_framebuffer10 = "false"
scale_type_x10 = "source"
scale_x10 = "1.000000"
scale_type_y10 = "source"
scale_y10 = "1.000000"
shader11 = "shaders_slang/crt/shaders/guest/advanced/gaussian_horizontal.slang"
filter_linear11 = "true"
wrap_mode11 = "clamp_to_border"
mipmap_input11 = "false"
alias11 = ""
float_framebuffer11 = "true"
srgb_framebuffer11 = "false"
scale_type_x11 = "absolute"
scale_x11 = "640"
scale_type_y11 = "source"
scale_y11 = "1.000000"
shader12 = "shaders_slang/crt/shaders/guest/advanced/gaussian_vertical.slang"
filter_linear12 = "true"
wrap_mode12 = "clamp_to_border"
mipmap_input12 = "false"
alias12 = "GlowPass"
float_framebuffer12 = "true"
srgb_framebuffer12 = "false"
scale_type_x12 = "absolute"
scale_x12 = "640"
scale_type_y12 = "absolute"
scale_y12 = "480"
shader13 = "shaders_slang/crt/shaders/guest/advanced/bloom_horizontal.slang"
filter_linear13 = "true"
wrap_mode13 = "clamp_to_border"
mipmap_input13 = "false"
alias13 = ""
float_framebuffer13 = "true"
srgb_framebuffer13 = "false"
scale_type_x13 = "absolute"
scale_x13 = "640"
scale_type_y13 = "absolute"
scale_y13 = "480"
shader14 = "shaders_slang/crt/shaders/guest/advanced/bloom_vertical.slang"
filter_linear14 = "true"
wrap_mode14 = "clamp_to_border"
mipmap_input14 = "false"
alias14 = "BloomPass"
float_framebuffer14 = "true"
srgb_framebuffer14 = "false"
scale_type_x14 = "absolute"
scale_x14 = "640"
scale_type_y14 = "absolute"
scale_y14 = "480"
shader15 = "shaders_slang/crt/shaders/guest/advanced/crt-guest-advanced-ntsc.slang"
filter_linear15 = "true"
wrap_mode15 = "clamp_to_border"
mipmap_input15 = "false"
alias15 = ""
float_framebuffer15 = "true"
srgb_framebuffer15 = "false"
scale_type_x15 = "viewport"
scale_x15 = "1.000000"
scale_type_y15 = "viewport"
scale_y15 = "1.000000"
shader16 = "shaders_slang/crt/shaders/guest/advanced/deconvergence-ntsc.slang"
filter_linear16 = "true"
wrap_mode16 = "clamp_to_border"
mipmap_input16 = "false"
alias16 = ""
float_framebuffer16 = "false"
srgb_framebuffer16 = "false"
scale_type_x16 = "viewport"
scale_x16 = "1.000000"
scale_type_y16 = "viewport"
scale_y16 = "1.000000"
g_crtgamut = "1.000000"
g_vignette = "0.000000"
g_cntrst = "0.400000"
quality = "-1.000000"
cust_fringing = "1.000000"
cust_artifacting = "2.000000"
SHARPEN = "2.000000"
CONTR = "0.200000"
SIGMA_VB = "0.750000"
bloom = "-0.700000"
halation = "0.100000"
gamma_c = "1.360000"
brightboost = "1.300001"
brightboost1 = "1.250000"
gsl = "-1.000000"
h_sharp = "2.000002"
s_sharp = "1.500000"
ring = "0.700000"
warpX = "0.050000"
warpY = "0.070000"
csize = "0.080000"
bsize1 = "0.300000"
shadowMask = "10.000000"
maskstr = "1.000000"
slotmask = "1.000000"
slotmask1 = "1.000000"
slotwidth = "4.000000"
double_slot = "2.000000"
mclip = "0.350000"
gamma_out = "2.000000"
deconrr = "1.750000"
deconrb = "-1.750000"
deconrry = "1.250000"
deconrby = "-1.250000"
decons = "1.200000"
addnoised = "-0.100000"
noiseresd = "1.000000"
noisetype = "1.000000"
post_br = "1.100000"
textures = "SamplerLUT1;SamplerLUT2;SamplerLUT3;SamplerLUT4"
SamplerLUT1 = "shaders_slang/crt/shaders/guest/advanced/lut/trinitron-lut.png"
SamplerLUT1_linear = "true"
SamplerLUT1_wrap_mode = "clamp_to_border"
SamplerLUT1_mipmap = "false"
SamplerLUT2 = "shaders_slang/crt/shaders/guest/advanced/lut/inv-trinitron-lut.png"
SamplerLUT2_linear = "true"
SamplerLUT2_wrap_mode = "clamp_to_border"
SamplerLUT2_mipmap = "false"
SamplerLUT3 = "shaders_slang/crt/shaders/guest/advanced/lut/nec-lut.png"
SamplerLUT3_linear = "true"
SamplerLUT3_wrap_mode = "clamp_to_border"
SamplerLUT3_mipmap = "false"
SamplerLUT4 = "shaders_slang/crt/shaders/guest/advanced/lut/ntsc-lut.png"
SamplerLUT4_linear = "true"
SamplerLUT4_wrap_mode = "clamp_to_border"
SamplerLUT4_mipmap = "false"

Edit: I just noticed that your update says you improved blend mode 1 for ntsc fast only lol

[guest.r]

@sonkun

This update came right on time as I was thinking I wanted my “8/16bit” presets a bit sharper. I did a little tweaking and came up with this, here’s a before and after pic.

Yeah, previously the shader was missing the option to increase the local contrast caused by sharpening. I’m very glad it proved as a nice and useful addon. In fact, using the new setting with 1.0 honors the original filtering.

As i observed some very late big&flat crt tv’s they also used some sort signal processing like this to produce a sharper appearance. They were available while emulation was already widespread, so this is maybe a lesser nostalgic contribution, but still historically correct.

@sonkun

my question to you @guest.r is can I manage to make it even sharper using blend mode 1? I ask because if I start raising the sharpness more I notice details start to go missing on some objects. My ideal sharpness is the look Blend 0 gives but when using that mode I notice it makes certain effects like the transparency in Sonic 1 waterfalls look weird so I stick to Blend Mode 1.

TBH your presets look very nice and i would suggest you make a couple more, although Sonic waterfall is a bit overrated imo. Otoh the only de-dithering algorithm that can deal with it is Hyllian’s sgenpt-mix, which was also tested and debugged on the ‘waterfall’. In the perspective, a couple more presets is what i’m cheering for.

[sonkun]

Oh yeah, contrast is definitely a good thing, I started using it previously through grade because of you in fact. I appreciate that you like my presets, I feel like the “arcade” ones are good to go, maybe a little more tweaking here and there but I’ve always somewhat had an issue dealing with sharpness on my 8/16 bit presets and I believe your latest update brought in a solution if I can tweak it right. I did some more tweaking check this out, here’s my previous settings once again:

Here’s how it looks after using Blend Mode 0:

To me that looks way better and sharper but here’s where the problem comes in. When using that same Blend Mode 0 on dithering games like Sonic 2 it looks like this:

Then I went back to Blend Mode 1 and now it looks how I want it to look like this:

So I’m stuck between trying to get that sharpness from the Blend Mode 0 Zelda pic along with the dithering effects you get from Blend Mode 1 in the Sonic 2 pic.

I also tried adding in Hyllian’s sgenpt-mix into the chain to mix it with Blend Mode 0 and pretty much ended up with a image that looks like Blend Mode 0’s pic where I lose the dithering effects, there’s no mixing the two it seems. In the end I’ll just have to find a way to get it sharp enough using Blend Mode 1 while also getting that sharpness from Blend Mode 0, it might take a little while but I’ll come up with something lol.

Here’s the settings I used for the Blend Mode 0 pic:

shaders = "17"
shader0 = "shaders_slang/crt/shaders/guest/advanced/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/crt/shaders/guest/advanced/stock.slang"
filter_linear1 = "false"
wrap_mode1 = "clamp_to_border"
mipmap_input1 = "false"
alias1 = "StockPass"
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/advanced/afterglow0.slang"
filter_linear2 = "true"
wrap_mode2 = "clamp_to_border"
mipmap_input2 = "false"
alias2 = "AfterglowPass"
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/advanced/grade/pre-shaders-afterglow-grade.slang"
filter_linear3 = "true"
wrap_mode3 = "clamp_to_border"
mipmap_input3 = "false"
alias3 = "PrePass0"
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/advanced/ntsc/ntsc-pass1.slang"
filter_linear4 = "false"
wrap_mode4 = "clamp_to_border"
frame_count_mod4 = "2"
mipmap_input4 = "false"
alias4 = ""
float_framebuffer4 = "true"
srgb_framebuffer4 = "false"
scale_type_x4 = "source"
scale_x4 = "4.000000"
scale_type_y4 = "source"
scale_y4 = "1.000000"
shader5 = "shaders_slang/crt/shaders/guest/advanced/ntsc/ntsc-pass2.slang"
filter_linear5 = "true"
wrap_mode5 = "clamp_to_border"
mipmap_input5 = "false"
alias5 = ""
float_framebuffer5 = "false"
srgb_framebuffer5 = "false"
scale_type_x5 = "source"
scale_x5 = "0.500000"
scale_type_y5 = "source"
scale_y5 = "1.000000"
shader6 = "shaders_slang/crt/shaders/guest/advanced/custom-fast-sharpen.slang"
filter_linear6 = "true"
wrap_mode6 = "clamp_to_border"
mipmap_input6 = "false"
alias6 = "NtscPass"
float_framebuffer6 = "false"
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/advanced/convert-ntsc.slang"
filter_linear7 = "true"
wrap_mode7 = "clamp_to_border"
mipmap_input7 = "false"
alias7 = ""
float_framebuffer7 = "false"
srgb_framebuffer7 = "false"
scale_type_x7 = "source"
scale_x7 = "0.500000"
scale_type_y7 = "source"
scale_y7 = "1.000000"
shader8 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
filter_linear8 = "true"
wrap_mode8 = "clamp_to_border"
mipmap_input8 = "true"
alias8 = "PrePass"
float_framebuffer8 = "false"
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/advanced/avg-lum-ntsc.slang"
filter_linear9 = "true"
wrap_mode9 = "clamp_to_border"
mipmap_input9 = "true"
alias9 = "AvgLumPass"
float_framebuffer9 = "false"
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/advanced/linearize-ntsc.slang"
filter_linear10 = "true"
wrap_mode10 = "clamp_to_border"
mipmap_input10 = "false"
alias10 = "LinearizePass"
float_framebuffer10 = "true"
srgb_framebuffer10 = "false"
scale_type_x10 = "source"
scale_x10 = "1.000000"
scale_type_y10 = "source"
scale_y10 = "1.000000"
shader11 = "shaders_slang/crt/shaders/guest/advanced/gaussian_horizontal.slang"
filter_linear11 = "true"
wrap_mode11 = "clamp_to_border"
mipmap_input11 = "false"
alias11 = ""
float_framebuffer11 = "true"
srgb_framebuffer11 = "false"
scale_type_x11 = "absolute"
scale_x11 = "640"
scale_type_y11 = "source"
scale_y11 = "1.000000"
shader12 = "shaders_slang/crt/shaders/guest/advanced/gaussian_vertical.slang"
filter_linear12 = "true"
wrap_mode12 = "clamp_to_border"
mipmap_input12 = "false"
alias12 = "GlowPass"
float_framebuffer12 = "true"
srgb_framebuffer12 = "false"
scale_type_x12 = "absolute"
scale_x12 = "640"
scale_type_y12 = "absolute"
scale_y12 = "480"
shader13 = "shaders_slang/crt/shaders/guest/advanced/bloom_horizontal.slang"
filter_linear13 = "true"
wrap_mode13 = "clamp_to_border"
mipmap_input13 = "false"
alias13 = ""
float_framebuffer13 = "true"
srgb_framebuffer13 = "false"
scale_type_x13 = "absolute"
scale_x13 = "640"
scale_type_y13 = "absolute"
scale_y13 = "480"
shader14 = "shaders_slang/crt/shaders/guest/advanced/bloom_vertical.slang"
filter_linear14 = "true"
wrap_mode14 = "clamp_to_border"
mipmap_input14 = "false"
alias14 = "BloomPass"
float_framebuffer14 = "true"
srgb_framebuffer14 = "false"
scale_type_x14 = "absolute"
scale_x14 = "640"
scale_type_y14 = "absolute"
scale_y14 = "480"
shader15 = "shaders_slang/crt/shaders/guest/advanced/crt-guest-advanced-ntsc.slang"
filter_linear15 = "true"
wrap_mode15 = "clamp_to_border"
mipmap_input15 = "false"
alias15 = ""
float_framebuffer15 = "true"
srgb_framebuffer15 = "false"
scale_type_x15 = "viewport"
scale_x15 = "1.000000"
scale_type_y15 = "viewport"
scale_y15 = "1.000000"
shader16 = "shaders_slang/crt/shaders/guest/advanced/deconvergence-ntsc.slang"
filter_linear16 = "true"
wrap_mode16 = "clamp_to_border"
mipmap_input16 = "false"
alias16 = ""
float_framebuffer16 = "false"
srgb_framebuffer16 = "false"
scale_type_x16 = "viewport"
scale_x16 = "1.000000"
scale_type_y16 = "viewport"
scale_y16 = "1.000000"
g_crtgamut = "1.000000"
g_vignette = "0.000000"
g_cntrst = "0.400000"
quality = "-1.000000"
cust_fringing = "1.000000"
cust_artifacting = "2.000000"
SHARPEN = "2.000000"
CONTR = "0.200000"
blendMode = "0.000000"
SIGMA_VB = "0.750000"
bloom = "-0.700000"
halation = "0.100000"
gamma_c = "1.360000"
brightboost = "1.300001"
brightboost1 = "1.250000"
gsl = "-1.000000"
s_sharp = "1.500000"
ring = "1.500000"
warpX = "0.050000"
warpY = "0.070000"
csize = "0.080000"
bsize1 = "0.300000"
shadowMask = "10.000000"
maskstr = "1.000000"
slotmask = "1.000000"
slotmask1 = "1.000000"
slotwidth = "4.000000"
double_slot = "2.000000"
mclip = "0.350000"
gamma_out = "2.000000"
deconrry = "1.250000"
deconrby = "-1.250000"
decons = "1.400000"
addnoised = "-0.100000"
noiseresd = "1.000000"
noisetype = "1.000000"
post_br = "1.100000"
textures = "SamplerLUT1;SamplerLUT2;SamplerLUT3;SamplerLUT4"
SamplerLUT1 = "shaders_slang/crt/shaders/guest/advanced/lut/trinitron-lut.png"
SamplerLUT1_linear = "true"
SamplerLUT1_wrap_mode = "clamp_to_border"
SamplerLUT1_mipmap = "false"
SamplerLUT2 = "shaders_slang/crt/shaders/guest/advanced/lut/inv-trinitron-lut.png"
SamplerLUT2_linear = "true"
SamplerLUT2_wrap_mode = "clamp_to_border"
SamplerLUT2_mipmap = "false"
SamplerLUT3 = "shaders_slang/crt/shaders/guest/advanced/lut/nec-lut.png"
SamplerLUT3_linear = "true"
SamplerLUT3_wrap_mode = "clamp_to_border"
SamplerLUT3_mipmap = "false"
SamplerLUT4 = "shaders_slang/crt/shaders/guest/advanced/lut/ntsc-lut.png"
SamplerLUT4_linear = "true"
SamplerLUT4_wrap_mode = "clamp_to_border"
SamplerLUT4_mipmap = "false"

[KoKlusz]

@guest.r Blend Mode 2 seems to disable interlacing, is this a bug or an intended behavior?

[guest.r]

It’s a feature, not a bug. With blend mode 2.0 and standard ntsc shader preset the linearize/interlacing pass is skipped due a different scaling design. But you can use interlacing and blend mode 2.0 with the ntsc-fast preset.

[sonkun]

Ok here’s another one, I went and tried that sgenpt-mix again but this time I also added jinc2-dedither into the chain as well and I think it looks a lot better now. Here’s my previous settings again:

Here’s how it looks now:

For dithering here’s my previous settings:

Here’s how it looks now:

I ended up ditching the waterfall rainbow look and it’s not blended as soft as it was before but I’ll take that trade off for a clearer image any day.

I also went and tried it out on my “arcade” presets and got good results with the dithering now. Here’s Mega Man X4 for Sega Saturn previous settings:

Here’s how it looks now:

You can preview these settings before I eventually post them in the show off thread. I may or not do more tweaking but I’ll see by tomorrow.

8/16 bit preset:

shaders = "17"
shader0 = "shaders_slang/dithering/shaders/jinc2-dedither.slang"
filter_linear0 = "true"
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/dithering/shaders/sgenpt-mix.slang"
filter_linear1 = "false"
wrap_mode1 = "clamp_to_border"
mipmap_input1 = "false"
alias1 = "StockPass"
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/advanced/afterglow0.slang"
filter_linear2 = "true"
wrap_mode2 = "clamp_to_border"
mipmap_input2 = "false"
alias2 = "AfterglowPass"
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/advanced/grade/pre-shaders-afterglow-grade.slang"
filter_linear3 = "true"
wrap_mode3 = "clamp_to_border"
mipmap_input3 = "false"
alias3 = "PrePass0"
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/advanced/ntsc/ntsc-pass1.slang"
filter_linear4 = "false"
wrap_mode4 = "clamp_to_border"
frame_count_mod4 = "2"
mipmap_input4 = "false"
alias4 = ""
float_framebuffer4 = "true"
srgb_framebuffer4 = "false"
scale_type_x4 = "source"
scale_x4 = "4.000000"
scale_type_y4 = "source"
scale_y4 = "1.000000"
shader5 = "shaders_slang/crt/shaders/guest/advanced/ntsc/ntsc-pass2.slang"
filter_linear5 = "true"
wrap_mode5 = "clamp_to_border"
mipmap_input5 = "false"
alias5 = ""
float_framebuffer5 = "false"
srgb_framebuffer5 = "false"
scale_type_x5 = "source"
scale_x5 = "0.500000"
scale_type_y5 = "source"
scale_y5 = "1.000000"
shader6 = "shaders_slang/crt/shaders/guest/advanced/custom-fast-sharpen.slang"
filter_linear6 = "true"
wrap_mode6 = "clamp_to_border"
mipmap_input6 = "false"
alias6 = "NtscPass"
float_framebuffer6 = "false"
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/advanced/convert-ntsc.slang"
filter_linear7 = "true"
wrap_mode7 = "clamp_to_border"
mipmap_input7 = "false"
alias7 = ""
float_framebuffer7 = "false"
srgb_framebuffer7 = "false"
scale_type_x7 = "source"
scale_x7 = "0.500000"
scale_type_y7 = "source"
scale_y7 = "1.000000"
shader8 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
filter_linear8 = "true"
wrap_mode8 = "clamp_to_border"
mipmap_input8 = "true"
alias8 = "PrePass"
float_framebuffer8 = "false"
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/advanced/avg-lum-ntsc.slang"
filter_linear9 = "true"
wrap_mode9 = "clamp_to_border"
mipmap_input9 = "true"
alias9 = "AvgLumPass"
float_framebuffer9 = "false"
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/advanced/linearize-ntsc.slang"
filter_linear10 = "true"
wrap_mode10 = "clamp_to_border"
mipmap_input10 = "false"
alias10 = "LinearizePass"
float_framebuffer10 = "true"
srgb_framebuffer10 = "false"
scale_type_x10 = "source"
scale_x10 = "1.000000"
scale_type_y10 = "source"
scale_y10 = "1.000000"
shader11 = "shaders_slang/crt/shaders/guest/advanced/gaussian_horizontal.slang"
filter_linear11 = "true"
wrap_mode11 = "clamp_to_border"
mipmap_input11 = "false"
alias11 = ""
float_framebuffer11 = "true"
srgb_framebuffer11 = "false"
scale_type_x11 = "absolute"
scale_x11 = "640"
scale_type_y11 = "source"
scale_y11 = "1.000000"
shader12 = "shaders_slang/crt/shaders/guest/advanced/gaussian_vertical.slang"
filter_linear12 = "true"
wrap_mode12 = "clamp_to_border"
mipmap_input12 = "false"
alias12 = "GlowPass"
float_framebuffer12 = "true"
srgb_framebuffer12 = "false"
scale_type_x12 = "absolute"
scale_x12 = "640"
scale_type_y12 = "absolute"
scale_y12 = "480"
shader13 = "shaders_slang/crt/shaders/guest/advanced/bloom_horizontal.slang"
filter_linear13 = "true"
wrap_mode13 = "clamp_to_border"
mipmap_input13 = "false"
alias13 = ""
float_framebuffer13 = "true"
srgb_framebuffer13 = "false"
scale_type_x13 = "absolute"
scale_x13 = "640"
scale_type_y13 = "absolute"
scale_y13 = "480"
shader14 = "shaders_slang/crt/shaders/guest/advanced/bloom_vertical.slang"
filter_linear14 = "true"
wrap_mode14 = "clamp_to_border"
mipmap_input14 = "false"
alias14 = "BloomPass"
float_framebuffer14 = "true"
srgb_framebuffer14 = "false"
scale_type_x14 = "absolute"
scale_x14 = "640"
scale_type_y14 = "absolute"
scale_y14 = "480"
shader15 = "shaders_slang/crt/shaders/guest/advanced/crt-guest-advanced-ntsc.slang"
filter_linear15 = "true"
wrap_mode15 = "clamp_to_border"
mipmap_input15 = "false"
alias15 = ""
float_framebuffer15 = "true"
srgb_framebuffer15 = "false"
scale_type_x15 = "viewport"
scale_x15 = "1.000000"
scale_type_y15 = "viewport"
scale_y15 = "1.000000"
shader16 = "shaders_slang/crt/shaders/guest/advanced/deconvergence-ntsc.slang"
filter_linear16 = "true"
wrap_mode16 = "clamp_to_border"
mipmap_input16 = "false"
alias16 = ""
float_framebuffer16 = "false"
srgb_framebuffer16 = "false"
scale_type_x16 = "viewport"
scale_x16 = "1.000000"
scale_type_y16 = "viewport"
scale_y16 = "1.000000"
JINC_SHARP = "3.000000"
SGPT_BLEND_LEVEL = "0.000000"
g_crtgamut = "1.000000"
g_vignette = "0.000000"
g_cntrst = "0.400000"
ntsc_scale = "1.599999"
SHARPEN = "2.000000"
blendMode = "0.000000"
SIGMA_VB = "0.750000"
bloom = "-0.700000"
halation = "0.100000"
gamma_c = "1.360000"
brightboost = "1.300000"
brightboost1 = "1.250000"
gsl = "-1.000000"
h_sharp = "1.100000"
s_sharp = "1.500000"
ring = "0.100000"
warpX = "0.050000"
warpY = "0.070000"
csize = "0.080000"
bsize1 = "0.300000"
shadowMask = "10.000000"
maskstr = "1.000000"
slotmask = "1.000000"
slotmask1 = "1.000000"
slotwidth = "4.000000"
double_slot = "2.000000"
mclip = "0.350000"
gamma_out = "2.000000"
deconrry = "1.250000"
deconrby = "-1.250000"
decons = "1.400000"
addnoised = "-0.100000"
noiseresd = "1.000000"
noisetype = "1.000000"
post_br = "1.100000"
textures = "SamplerLUT1;SamplerLUT2;SamplerLUT3;SamplerLUT4"
SamplerLUT1 = "shaders_slang/crt/shaders/guest/advanced/lut/trinitron-lut.png"
SamplerLUT1_linear = "true"
SamplerLUT1_wrap_mode = "clamp_to_border"
SamplerLUT1_mipmap = "false"
SamplerLUT2 = "shaders_slang/crt/shaders/guest/advanced/lut/inv-trinitron-lut.png"
SamplerLUT2_linear = "true"
SamplerLUT2_wrap_mode = "clamp_to_border"
SamplerLUT2_mipmap = "false"
SamplerLUT3 = "shaders_slang/crt/shaders/guest/advanced/lut/nec-lut.png"
SamplerLUT3_linear = "true"
SamplerLUT3_wrap_mode = "clamp_to_border"
SamplerLUT3_mipmap = "false"
SamplerLUT4 = "shaders_slang/crt/shaders/guest/advanced/lut/ntsc-lut.png"
SamplerLUT4_linear = "true"
SamplerLUT4_wrap_mode = "clamp_to_border"
SamplerLUT4_mipmap = "false"

Arcade preset:

shaders = "17"
shader0 = "shaders_slang/dithering/shaders/jinc2-dedither.slang"
filter_linear0 = "true"
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/dithering/shaders/sgenpt-mix.slang"
filter_linear1 = "false"
wrap_mode1 = "clamp_to_border"
mipmap_input1 = "false"
alias1 = "StockPass"
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/advanced/afterglow0.slang"
filter_linear2 = "true"
wrap_mode2 = "clamp_to_border"
mipmap_input2 = "false"
alias2 = "AfterglowPass"
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/advanced/grade/pre-shaders-afterglow-grade.slang"
filter_linear3 = "true"
wrap_mode3 = "clamp_to_border"
mipmap_input3 = "false"
alias3 = "PrePass0"
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/advanced/ntsc/ntsc-pass1.slang"
filter_linear4 = "false"
wrap_mode4 = "clamp_to_border"
frame_count_mod4 = "2"
mipmap_input4 = "false"
alias4 = ""
float_framebuffer4 = "true"
srgb_framebuffer4 = "false"
scale_type_x4 = "source"
scale_x4 = "4.000000"
scale_type_y4 = "source"
scale_y4 = "1.000000"
shader5 = "shaders_slang/crt/shaders/guest/advanced/ntsc/ntsc-pass2.slang"
filter_linear5 = "true"
wrap_mode5 = "clamp_to_border"
mipmap_input5 = "false"
alias5 = ""
float_framebuffer5 = "false"
srgb_framebuffer5 = "false"
scale_type_x5 = "source"
scale_x5 = "0.500000"
scale_type_y5 = "source"
scale_y5 = "1.000000"
shader6 = "shaders_slang/crt/shaders/guest/advanced/custom-fast-sharpen.slang"
filter_linear6 = "true"
wrap_mode6 = "clamp_to_border"
mipmap_input6 = "false"
alias6 = "NtscPass"
float_framebuffer6 = "false"
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/advanced/convert-ntsc.slang"
filter_linear7 = "true"
wrap_mode7 = "clamp_to_border"
mipmap_input7 = "false"
alias7 = ""
float_framebuffer7 = "false"
srgb_framebuffer7 = "false"
scale_type_x7 = "source"
scale_x7 = "0.500000"
scale_type_y7 = "source"
scale_y7 = "1.000000"
shader8 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
filter_linear8 = "true"
wrap_mode8 = "clamp_to_border"
mipmap_input8 = "true"
alias8 = "PrePass"
float_framebuffer8 = "false"
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/advanced/avg-lum-ntsc.slang"
filter_linear9 = "true"
wrap_mode9 = "clamp_to_border"
mipmap_input9 = "true"
alias9 = "AvgLumPass"
float_framebuffer9 = "false"
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/advanced/linearize-ntsc.slang"
filter_linear10 = "true"
wrap_mode10 = "clamp_to_border"
mipmap_input10 = "false"
alias10 = "LinearizePass"
float_framebuffer10 = "true"
srgb_framebuffer10 = "false"
scale_type_x10 = "source"
scale_x10 = "1.000000"
scale_type_y10 = "source"
scale_y10 = "1.000000"
shader11 = "shaders_slang/crt/shaders/guest/advanced/gaussian_horizontal.slang"
filter_linear11 = "true"
wrap_mode11 = "clamp_to_border"
mipmap_input11 = "false"
alias11 = ""
float_framebuffer11 = "true"
srgb_framebuffer11 = "false"
scale_type_x11 = "absolute"
scale_x11 = "640"
scale_type_y11 = "source"
scale_y11 = "1.000000"
shader12 = "shaders_slang/crt/shaders/guest/advanced/gaussian_vertical.slang"
filter_linear12 = "true"
wrap_mode12 = "clamp_to_border"
mipmap_input12 = "false"
alias12 = "GlowPass"
float_framebuffer12 = "true"
srgb_framebuffer12 = "false"
scale_type_x12 = "absolute"
scale_x12 = "640"
scale_type_y12 = "absolute"
scale_y12 = "480"
shader13 = "shaders_slang/crt/shaders/guest/advanced/bloom_horizontal.slang"
filter_linear13 = "true"
wrap_mode13 = "clamp_to_border"
mipmap_input13 = "false"
alias13 = ""
float_framebuffer13 = "true"
srgb_framebuffer13 = "false"
scale_type_x13 = "absolute"
scale_x13 = "640"
scale_type_y13 = "absolute"
scale_y13 = "480"
shader14 = "shaders_slang/crt/shaders/guest/advanced/bloom_vertical.slang"
filter_linear14 = "true"
wrap_mode14 = "clamp_to_border"
mipmap_input14 = "false"
alias14 = "BloomPass"
float_framebuffer14 = "true"
srgb_framebuffer14 = "false"
scale_type_x14 = "absolute"
scale_x14 = "640"
scale_type_y14 = "absolute"
scale_y14 = "480"
shader15 = "shaders_slang/crt/shaders/guest/advanced/crt-guest-advanced-ntsc.slang"
filter_linear15 = "true"
wrap_mode15 = "clamp_to_border"
mipmap_input15 = "false"
alias15 = ""
float_framebuffer15 = "true"
srgb_framebuffer15 = "false"
scale_type_x15 = "viewport"
scale_x15 = "1.000000"
scale_type_y15 = "viewport"
scale_y15 = "1.000000"
shader16 = "shaders_slang/crt/shaders/guest/advanced/deconvergence-ntsc.slang"
filter_linear16 = "true"
wrap_mode16 = "clamp_to_border"
mipmap_input16 = "false"
alias16 = ""
float_framebuffer16 = "false"
srgb_framebuffer16 = "false"
scale_type_x16 = "viewport"
scale_x16 = "1.000000"
scale_type_y16 = "viewport"
scale_y16 = "1.000000"
JINC_SHARP = "3.000000"
SGPT_BLEND_OPTION = "0.000000"
SGPT_BLEND_LEVEL = "0.000000"
g_signal_type = "0.000000"
g_crtgamut = "1.000000"
g_vignette = "0.000000"
g_cntrst = "0.400000"
wp_temperature = "11504.000000"
quality = "0.000000"
ntsc_phase = "3.000000"
ntsc_scale = "1.599999"
SHARPEN = "2.000000"
blendMode = "2.000000"
SIGMA_VB = "0.750000"
bloom = "-0.700000"
halation = "0.100000"
gamma_c = "1.360000"
brightboost = "1.300000"
brightboost1 = "1.250000"
gsl = "-1.000000"
h_sharp = "1.100000"
s_sharp = "1.500000"
ring = "0.100000"
warpX = "0.050000"
warpY = "0.070000"
csize = "0.080000"
bsize1 = "0.300000"
shadowMask = "10.000000"
maskstr = "1.000000"
slotmask = "1.000000"
slotmask1 = "1.000000"
slotwidth = "4.000000"
double_slot = "2.000000"
mclip = "0.350000"
gamma_out = "2.000000"
deconrry = "1.250000"
deconrby = "-1.250000"
decons = "1.400000"
post_br = "1.100000"
textures = "SamplerLUT1;SamplerLUT2;SamplerLUT3;SamplerLUT4"
SamplerLUT1 = "shaders_slang/crt/shaders/guest/advanced/lut/trinitron-lut.png"
SamplerLUT1_linear = "true"
SamplerLUT1_wrap_mode = "clamp_to_border"
SamplerLUT1_mipmap = "false"
SamplerLUT2 = "shaders_slang/crt/shaders/guest/advanced/lut/inv-trinitron-lut.png"
SamplerLUT2_linear = "true"
SamplerLUT2_wrap_mode = "clamp_to_border"
SamplerLUT2_mipmap = "false"
SamplerLUT3 = "shaders_slang/crt/shaders/guest/advanced/lut/nec-lut.png"
SamplerLUT3_linear = "true"
SamplerLUT3_wrap_mode = "clamp_to_border"
SamplerLUT3_mipmap = "false"
SamplerLUT4 = "shaders_slang/crt/shaders/guest/advanced/lut/ntsc-lut.png"
SamplerLUT4_linear = "true"
SamplerLUT4_wrap_mode = "clamp_to_border"
SamplerLUT4_mipmap = "false"

[sonkun]

Guest would it be possible to merge that mame_ntsc pass from the mame_hlsl folder into your advanced ntsc shader? I think that’s the only shader out of all crt shaders that actually does the rainbow banding correctly and I would love to see that setting incorporated into yours.

[ynnad4]

As an additional comment, I have a NES connected through RF-Switch still up to date and it exposes intense Rainbow colors. Through the NES cores you can get quite convincing results compared to my console just with the Blargg composite video filter in options OR crt.guest.r presets which already fit very well for NES at least.

However, in my experience there’s not such a thing about the rainbow banding that can be achieved through shaders except this very close enough result coming from the mame_hlsl passes (in Sega Genesis department).

[sonkun]

Let’s see what happens, if guest pulls this off that’ll only further cement his shader as the greatest of all time. I’m waiting to update my shaders until further notice on this

[Cyber]

@guest.r

Otoh the only de-dithering algorithm that can deal with it is Hyllian’s sgenpt-mix

Doesn’t MDAPT Mode 3 also de-dither “jail bars” (Sonic Waterfall) pretty well? It’s what I use for my Blending and Transparency preset.

Feel free to correct me if I might have misunderstood something.

@guest.r

In the perspective, a couple more presets is what i’m cheering for.

I second that motion!

[guest.r]

@sonkun

Guest would it be possible to merge that mame_ntsc pass from the mame_hlsl folder into your advanced ntsc shader? I think that’s the only shader out of all crt shaders that actually does the rainbow banding correctly and I would love to see that setting incorporated into yours.

It can be merged already with replacing the first two stock passes, but in general i try to avoid too many mainstream presets. Probably i’ll tweak the existing ntsc shaders for a bit more sharpness though. Screenshots of genesis games do indeed show the diagonal banding / rainbow effect, while with current ntsc shaders it’s a temporal horizontal effect (2-phase encoding/decoding).

@Cyber

Doesn’t MDAPT Mode 3 also de-dither “jail bars” (Sonic Waterfall) pretty well? It’s what I use for my Blending and Transparency preset.

Feel free to correct me if I might have misunderstood something.

It seems that GDAPT does a great job too with some parameter tweaks, and it’s only a 2-pass shader. Jinc2 and similar de-dithers can’t do it properly and that’s what i had in mind.

[rafan]

Hi @guest.r,

I came across some interesting reading. I immediately thought this might be of interest to your shader. Note that the documents are from 2011, so it surpasses sRGB specification by quite some time.

SpectraCal’s Director of Software Development, Joel Barsotti, argues that the BT. 1886 gamma function (EOTF) more accurately matches legacy CRT technology than previous power law based functions. The argument is that it properly takes into account the legacy “contrast” and “brightness” controls on CRTs.

I was especially surprised by how much focus there is in the documents on matching legacy CRT monitors.

In a Calman FAQ document https://kb.portrait.com/help/bt-1886-10-questions-10-answers some of the advantages are mentioned.

BT.1886 offers several clear advantages over previous practice. First, BT.1886 more closely mimics the behavior of CRTs than previous power functions

Previous gamma functions additionally do not adequately account for independent adjustment of brightness and contrast controls on a display.

BT.1886 makes little difference at the bright end of the gray scale, but it makes a substantial difference at the black end.

Note these documents are from 2011, so are surpassing the sRGB spec / considered a worthwhile improvement on sRGB EOTF.

If you’re interested, please see Annex 1 on page 2 and Appendix 1 (Informative) EOTF-CRT matching on page 3 of the ITU recommendation document: https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.1886-0-201103-I!!PDF-E.pdf

For the shader I was especially triggered by the comments in Appendix 1 (Informative) EOTF-CRT matching, which focuses on matching a CRT for which you know (or can measure) the black level and brightness level:

The EOTF specified in Annex 1 is considered to be a satisfactory, but not exact, match to the characteristic of an actual CRT. When it is desired to match a CRT, the Lw and LB parameters of the EOTF can be set to the corresponding values of the CRT that are being matched.

Do you think that this BT. 1886 implementation of contrast and brightness control directly with the EOTF could improve on the current brightness and contrast controls in the shader?

EDIT: In appendix 2 there’s also the noteworthy comment:

In measuring the EOTF of a large number of CRTs it was determined that the EOTF of the CRT was in fact highly variable when the brightness/contrast was adjusted, it is therefore not possible to 100% emulate CRT capability (or limitations). Users of this Recommendation in combination with the new technologies should be able to achieve a higher degree of image presentation repeatability than that offered in the past.

[guest.r]

I took some looks to the paper and other documentation and i feel somewhat obliged to clarify some issues:

The ‘GDV’ shader with it’s default settings is gamma neutral. It means that which source images are provided, they get out neutral (luminatively same) if other settings are neutral (mask, brightness controls…). The shader’s gamma purpose has basically nothing to do directly with LCD gamma, although different values of input/output gamma can compensate odd gamma feels of the ‘LCD’.

This means that the gamma function can have different application purposes. For consistent looks colors in the shader need to be interpolated and there are several reasons the shader interpolates in linear space, like to match the ‘crt horizontal interpolation’, shape the scanline interpolation respectively, define the glow effect etc.

I’m saying that there is nothing wrong with current gamma implementation as long as the precision offered by the buffer used is sufficient.

With my experimenting with the sRGB 2.4 gamma and buffer the only practically visible difference could be at pixel junctions, but nothing positively observable. The negative is that the user is limited to both gamma values of 2.4, glow looks much worse etc.

The standard for the sRGB buffer was developed with memory savings in mind while still providing decent results. Today 16 bit float buffers (per component) are nothing uncommon and shader registers / processors operate with 32 bit floating precision (mainstream).

The main benefit there could be with the BT.1886 gamma are better contrast controls, but not to forget there are two displays to be considered: target crt and the user’s display. The general approach is simple enough i guess, even if there are more parameters, for a reasonable crt feel.

[ynnad4]

Proof I could get about the Rainbow banding in Sega Genesis games: (@sonkun)

1. Real hardware Sega Genesis (model 1) VS RetroArch Genesis Plus GX (my rainbow sega preset v2.7)

2. Real console proof by HunterK vs some fast tweak I did to replicate with mame_hlsl for GenesisPlusGX core

https://www.chrismcovell.com/gotRGB/screenshots.html

Rainbow sega preset available in here: Rainbow with composite - MOD preset for Sega Genesis Games

3. More serious dithering + rainbow effect exposure from real Genesis console:

Dithering on the Sega Genesis with Composite Video

4. This is some old preset named rainbow sega v3.0 which gets some Rainbow comparison to real Genesis console:

Rainbow with composite - MOD preset for Sega Genesis Games

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…

2021-10-14 21-51-43.mkv

5. Some other video comparison from rainbow sega v4.0 and 4.1 presets I did to compare Rainbow effect with original Genesis console model 2

Rainbow with composite - MOD preset for Sega Genesis Games

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: [Sonic 2 -Genesis Test Capture] 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. [4…

Rainbow sega danny v4.0 video comparison demostration.mkv

some other video samples for the original Rainbow looking:

https://youtu.be/SwotQNShPvs?t=380 (model 2)

Sonic the Hedgehog 2 (Sega Genesis - Composite VS. S-Video)

7. some of my attempts to replicate this source video sample with my preset v6.291

https://youtu.be/EtNjgW5RtyI?t=365 (Genesis Model 1 VA6.8 )

Rainbow with composite - MOD preset for Sega Genesis Games

hello there again. Just sharing some experimental presets left aiming to give some similar results from available samples: Rainbow sega v6.26 is intended to work either for BlastEm OR Genesis Plus GX with core options >> borders (overscan) = Full OR left/right being set available. video sample: Sonic the Hedgehog 2 (Sega Genesis - Composite VS. S-Video) - YouTube Also, a video available as a proof for v6.26 in Sonic waterfall to expose dithering + rainbow effect. Left side is Genesis cons…

8. All the NTSC-Rainbow intended shaders available I have tested around with the exception of mame_hlsl, actually have delivered to me a wrong Rainbow banding in Streets of Rage 2 for the Genesis console. Which the results are somehow similar to this:

Rainbow with composite - MOD preset for Sega Genesis Games

This is a very recent sample. Big thanks to the guy who made it possible. [Streets of Rage 2 ( Sega Genesis - Composite VS. S-Video)] So there it seems to match pretty well what is done with the rainbow sega v6.26 preset. This is how it looks to me with that version in streets of rage 2: I will look if can give a bit more accurate rainbow with your 8-16bits preset, however I may really appreciate if this effect can be combined with OTHER composite-blurry looking shader/presets. …

Big thanks to the author from this video that delivers such a wonderful Streets of Rage 2 gameplay demostration to check the proper Rainbow:

https://youtu.be/bpqmPjpfN1k?t=342 (Genesis Model 2 with Composite-video)

This is a little proof of how the same game look like with my preset rainbow sega v6.26:

2022-03-02 15-38-30.mkv

…

Many thanks to all the nice people who recorded all of these great classic games and served for this case situation.

[sonkun]

Got it, no problem at all. In that case I’ll just post up my shaders as is, like you said I can still get the look by just adding in that pass.

[guest.r]

@guest.r

Probably i’ll tweak the existing ntsc shaders for a bit more sharpness though.

I report a nice success with new ntsc-sharpness implementation. More info in the release notes.

New Release Version (2022-05-21-r1):

Notable changes:

• only ntsc-based changes with this version
• new ntsc-sharpness implementation, nice new looks are possible
• sharpness and de-dithering are mutually exclusive at some point, so a pair of great gdapt shaders are now included with the preset, which was updated, de-dithering has to be enabled with a parameter though
• ntsc-sharpness shader is no longer needed, so it was removed from the preset
• with testing the shader performance is about the same
• new sharpness feature works great with 3-phase mode, just mentioning

Download link:

https://mega.nz/file/4gY0gJZR#t0or-vPntGVn3li_nnVYwA2iKO5RYbGpnXGe7q4S6jg

Screenie:

[RealNC]

Thanks. Will try it out when I get the chance. Also forgot to say thanks for the luma noise. It’s great! No more ruined black level!

Though there’s something odd about the randomness of the noise. It doesn’t seem very… random. Can’t quite put my finger on it. (Not specifically luma noise. Both types give the impression of a repeating pattern. Kind of…)

[Syh]

Ik exactly what you’re meaning by the noise feels like it’s on a patterned/loop. I’m not sure what’s going on but I experience a seemingly similar situation.

[hunterk]

Randomness in shaders is a tough nut to crack. There’s no way to get truly random values, and the built-in “noise” value has apparently never been implemented in a useful way (it always returns 0.0, which is arguably technically correct, since the values it returns are supposed to average out to 0.0…).

The alternative is to generate pseudo-random numbers inside the shader, but this is computationally expensive and has performance vs quality (i.e., visible patterns/looping) tradeoffs, as well as GPU/driver-dependent quirks. For example, there’s a famous one-liner PRNG that relies on inconsistencies in fract-ing certain floating point values, but it falls apart on mobile GPUs.

Similarly, many of the common PRNGs you can find online fall apart (or get out of hand, computationally) when the seed value–usually FrameCount in our case, so it moves around each frame–gets too high, so you have to modulo the value to keep it in a usable range, but whenever it loops, you get a sort of “reset” back to the minimum value, which is often visually noticeable and is exacerbated by happening at consistent intervals (every 783 frames or whatever is hardcoded in the mod() function).

One option here may be to sample a robust noise LUT using a pseudo-random texture coordinate, so you get the visual benefit of random-on-random without having to generate both of them on each frame.

[sonkun]

This update just had to come after I updated my presets lol. Adding in that gdapt shader definitely was unexpected, I tested it out a little and for some reason I’m just not getting good results with it, seems buggy actually unless I’m just not tweaking it right. I get a nice sharper clearer picture when using the jinc2-dedither shader in my shader chain since it comes with it own sharpness setting as well (I played around with every dithering shader in that dithering shader folder even sgenpt-mix and none of them produced the same kind of image as jinc), kind of wish you had used that shader instead. Still a nice feature though and that updated sharpness is nice as well. Should be simple to update my presets with this new release since I plan on sticking with the jinc2-dedither shader that I ended up using in my last update.