This is my “composite” style shader as it beats up your SNES and Genesis games pretty good but looks great on Dreamcast and upscaled Ps1.
shaders = "10"
shader0 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
filter_linear0 = "false"
wrap_mode0 = "clamp_to_border"
mipmap_input0 = "false"
alias0 = "StockPass"
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/afterglow0.slang"
filter_linear1 = "true"
wrap_mode1 = "clamp_to_border"
mipmap_input1 = "false"
alias1 = "AfterglowPass"
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/pre-shaders-afterglow.slang"
filter_linear2 = "true"
wrap_mode2 = "clamp_to_border"
mipmap_input2 = "false"
alias2 = "PrePass0"
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/ntsc/ntsc-pass1.slang"
filter_linear3 = "true"
wrap_mode3 = "clamp_to_border"
frame_count_mod3 = "2"
mipmap_input3 = "false"
alias3 = ""
float_framebuffer3 = "true"
srgb_framebuffer3 = "false"
scale_type_x3 = "source"
scale_x3 = "4.000000"
scale_type_y3 = "source"
scale_y3 = "1.000000"
shader4 = "shaders_slang/crt/shaders/guest/advanced/ntsc/ntsc-pass2.slang"
filter_linear4 = "false"
wrap_mode4 = "clamp_to_border"
mipmap_input4 = "false"
alias4 = "PrePass"
float_framebuffer4 = "false"
srgb_framebuffer4 = "false"
scale_type_x4 = "source"
scale_x4 = "0.500000"
scale_type_y4 = "source"
scale_y4 = "1.000000"
shader5 = "shaders_slang/crt/shaders/guest/advanced/avg-lum-ntsc.slang"
filter_linear5 = "true"
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/advanced/linearize-ntsc.slang"
filter_linear6 = "true"
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/advanced/bloom_horizontal_ntsc.slang"
filter_linear7 = "true"
wrap_mode7 = "clamp_to_border"
mipmap_input7 = "false"
alias7 = ""
float_framebuffer7 = "true"
srgb_framebuffer7 = "false"
scale_type_x7 = "absolute"
scale_x7 = "800"
scale_type_y7 = "source"
scale_y7 = "1.000000"
shader8 = "shaders_slang/crt/shaders/guest/advanced/bloom_vertical_ntsc.slang"
filter_linear8 = "true"
wrap_mode8 = "clamp_to_border"
mipmap_input8 = "false"
alias8 = "GlowPass"
float_framebuffer8 = "true"
srgb_framebuffer8 = "false"
scale_type_x8 = "absolute"
scale_x8 = "800"
scale_type_y8 = "absolute"
scale_y8 = "600"
shader9 = "shaders_slang/crt/shaders/guest/advanced/crt-guest-advanced-ntsc.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 = "bogus_afterglow;PR;PG;PB;AS;sat;bogus_color;TNTC;LS;LUTLOW;LUTBR;CP;CS;WP;wp_saturation;BP;vigstr;vigdef;viground;quality;bw;linearize;lsmooth;GAMMA_INPUT;bogus_deconvergence;decon;deconstr;bogus_interlacing;inter;interm;inters;iscan;intres;bogus_bloom;SIZEHB;SIGMA_HB;SIZEVB;SIGMA_VB;bogus_brightness;glow;bloom;halation;contrastd;gamma_c;brightboost;brightboost1;bogus_scanline;gsl;scanline1;scanline2;beam_min;beam_max;beam_size;vertmask;scans;spike;bogus_filtering;h_sharp;s_sharp;bogus_screen;TATE;IOS;OS;BLOOM;csize;bsize;warpX;warpY;overscanX;overscanY;bogus_masks;shadowMask;maskstr;masksize;maskDark;maskLight;mcut;mask_gamma;slotmask;slotwidth;double_slot;slotms;mclip;gamma_out"
bogus_afterglow = "0.000000"
PR = "0.140000"
PG = "0.140000"
PB = "0.140000"
AS = "0.070000"
sat = "0.100000"
bogus_color = "0.000000"
TNTC = "2.000000"
LS = "32.000000"
LUTLOW = "5.000000"
LUTBR = "1.000000"
CP = "5.000000"
CS = "0.000000"
WP = "-50.000000"
wp_saturation = "1.000000"
BP = "0.000000"
vigstr = "0.000000"
vigdef = "3.600000"
viground = "8.000000"
quality = "1.000000"
bw = "0.000000"
linearize = "0.000000"
lsmooth = "0.900000"
GAMMA_INPUT = "2.400000"
bogus_deconvergence = "0.000000"
decon = "1.000000"
deconstr = "0.550000"
bogus_interlacing = "0.000000"
inter = "325.000000"
interm = "4.000000"
inters = "0.000000"
iscan = "0.500000"
intres = "0.000000"
bogus_bloom = "0.000000"
SIZEHB = "6.000000"
SIGMA_HB = "1.000000"
SIZEVB = "6.000000"
SIGMA_VB = "1.000000"
bogus_brightness = "0.000000"
glow = "0.100000"
bloom = "0.000000"
halation = "0.000000"
contrastd = "0.000000"
gamma_c = "1.200000"
brightboost = "1.400000"
brightboost1 = "1.599988"
bogus_scanline = "0.000000"
gsl = "0.000000"
scanline1 = "6.000000"
scanline2 = "8.000000"
beam_min = "1.300000"
beam_max = "1.000000"
beam_size = "0.600000"
vertmask = "0.000000"
scans = "0.600000"
spike = "1.000000"
bogus_filtering = "0.000000"
h_sharp = "5.200000"
s_sharp = "0.500000"
bogus_screen = "0.000000"
TATE = "0.000000"
IOS = "0.000000"
OS = "1.000000"
BLOOM = "0.000000"
csize = "0.000000"
bsize = "600.000000"
warpX = "0.000000"
warpY = "0.000000"
overscanX = "0.000000"
overscanY = "0.000000"
bogus_masks = "0.000000"
shadowMask = "7.000000"
maskstr = "0.300000"
masksize = "1.000000"
maskDark = "0.600000"
maskLight = "1.500000"
mcut = "0.800000"
mask_gamma = "5.000000"
slotmask = "0.700000"
slotwidth = "2.000000"
double_slot = "1.000000"
slotms = "1.000000"
mclip = "0.500000"
gamma_out = "2.400000"
textures = "SamplerLUT1;SamplerLUT2;SamplerLUT3;SamplerLUT4"
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"
SamplerLUT4 = "shaders_slang/crt/shaders/guest/lut/custom_lut.png"
SamplerLUT4_linear = "true"
SamplerLUT4_wrap_mode = "clamp_to_border"
SamplerLUT4_mipmap = "false"