One benefit the author of bfi and the shader subframe feature pointed out is that when using this the hdr could go a lot higher in nits as only a small part of the screen is lit at any one point so depending on the tvs algorithm maybe its a brightness boost. It has to be noted there is interference at the interface between the two sub frames so use scanlines to hide them i.e the megatron shader or any other shader with black between the scanlines.
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Not sure if it’s been mentioned/implemented yet, but the last time I was messing with HDR and BFI I was desperately needing a separate UI brightness setting. Cranking brightness for BFI means the menu is eye-searing, which also has the effect of making the game look even darker by comparison because of the eyes adjusting to the bright UI.
Hopefully this is easy enough to do.
3 Likes
What’s the benefit of using software bfi over the TV’s bfi? I found the latter to be much more reliable/stable than the former when I compared a while back. I understand with software bfi you can enable vrr too, but your comment implied a brightness benefit?
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I don’t think you can enable software BFI and VRR at the same time.
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I thought you could have software bfi via retroarch and hardware vrr via the tv? Never tried it though
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I suppose it would be more accurate to say that LG’s hardware BFI is fundamentally incompatible with their HDR tonemapping in a way that results in radically reduced brightness.
Software BFI also gives you 60hz BFI with 120hz input lag.
I use the hardware BFI in SDR for video, higher framerate games, and low fps games that are incompatible with software BFI due to onerous anti-cheat.
You can (and ideally should). It’s hardware BFI that doesn’t work with VRR, at least on LG displays.
3 Likes
Software, shader-based BFI+VRR should be essentially automatic, since the shaders are naturally tied to the content refresh rate in VRR. Driver-based BFI (that is, the options in the menu), I’m not sure about. EDIT: just asked around and it does not work with VRR
Display-based backlight strobing is typically a “nicer” experience, though, because you don’t have to worry about dropped frames / stutters creating a jarring blink each time. If you have rock-solid sync and never drop frames, though, it should be essentially indistinguishable.
Now that we have subframe-aware shaders, though, the calculus is likely to change, as we can potentially do simulated rolling scan and other high-refresh shenanigans.
2 Likes
This is what I was referring to.
1 Like
Which offers more reliable/smooth bfi? Driver or shader? Rolling scan simulation sounds amazing, but i doubt my 120hz tv will do it justice.
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It could be part heat, part voltage, maybe even some sort of capacitance taking place. So that’s why heatsink help but don’t eliminate the issue completely.
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I suppose it would be more accurate to say that LG’s hardware BFI is fundamentally incompatible with their HDR tonemapping in a way that results in radically reduced brightness.
Is it that the only reason why LG and other manufacturers turn off HDR with BFI purely because BFI lowers the peak brightness too much and manufacturers dont want to confuse consumers? I dont think technically there is anything stopping them from having BFI and HDR turned on at the same time? Possibly some ‘mechanical’ property of the display stops them?
You can use HDR with BFI, at least on my C2. I’d say HDR is essential with BFI to make up for the brightness loss. LG don’t allow BFI and VRR together.
2 Likes
I tested software bfi and it’s still pretty ropey compared to hardware. It does work with g-sync, but not smoothly. I’ll stick to hardware bfi without vrr. One thing both hardware and software bfi seem to hate is non-50/60 hz games such as 54hz arcade games
2 Likes
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scale_type_y4 = "source"
scale_y4 = "1.000000"
shader5 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/shaders/guest/advanced/ntsc/ntsc-pass3.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 = "1.000000"
scale_type_y5 = "source"
scale_y5 = "1.000000"
shader6 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/shaders/guest/advanced/custom-fast-sharpen.slang"
filter_linear6 = "true"
wrap_mode6 = "clamp_to_border"
mipmap_input6 = "false"
alias6 = "LinearizePass"
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-guest-advanced-2024-02-29-release1/shaders/guest/advanced/crt-guest-advanced-ntsc-pass1.slang"
filter_linear7 = "true"
wrap_mode7 = "clamp_to_border"
mipmap_input7 = "false"
alias7 = "Pass1"
float_framebuffer7 = "false"
srgb_framebuffer7 = "false"
scale_type_x7 = "viewport"
scale_x7 = "1.000000"
scale_type_y7 = "source"
scale_y7 = "1.000000"
shader8 = "shaders_slang/hdr/shaders/crt-sony-megatron-source-pass.slang"
filter_linear8 = "false"
wrap_mode8 = "clamp_to_border"
mipmap_input8 = "false"
alias8 = "SourceSDR"
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/hdr/shaders/crt-sony-megatron-hdr-pass.slang"
filter_linear9 = "false"
wrap_mode9 = "clamp_to_border"
mipmap_input9 = "false"
alias9 = "SourceHDR"
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/hdr/shaders/crt-sony-megatron.slang"
filter_linear10 = "false"
wrap_mode10 = "clamp_to_border"
mipmap_input10 = "false"
alias10 = ""
float_framebuffer10 = "false"
srgb_framebuffer10 = "false"
textures = "SamplerLUT1;SamplerLUT2;SamplerLUT3;SamplerLUT4"
SamplerLUT1 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/shaders/guest/advanced/lut/trinitron-lut.png"
SamplerLUT1_wrap_mode = "clamp_to_border"
SamplerLUT1_mipmap = "false"
SamplerLUT2 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/shaders/guest/advanced/lut/inv-trinitron-lut.png"
SamplerLUT2_wrap_mode = "clamp_to_border"
SamplerLUT2_mipmap = "false"
SamplerLUT3 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/shaders/guest/advanced/lut/nec-lut.png"
SamplerLUT3_wrap_mode = "clamp_to_border"
SamplerLUT3_mipmap = "false"
SamplerLUT4 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/shaders/guest/advanced/lut/ntsc-lut.png"
SamplerLUT4_wrap_mode = "clamp_to_border"
SamplerLUT4_mipmap = "false"
New Grade-No-LUT + Decoupled Guest NTSC + Filtering Options + Sony Megatron Colour Video Monitor
shaders = "11"
feedback_pass = "0"
shader0 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/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-guest-advanced-2024-02-29-release1/shaders/guest/advanced/stock.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/misc/shaders/grade-no-LUT.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-guest-advanced-2024-02-29-release1/shaders/guest/advanced/ntsc/ntsc-pass1.slang"
filter_linear3 = "false"
wrap_mode3 = "clamp_to_border"
mipmap_input3 = "false"
alias3 = "NPass1"
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-guest-advanced-2024-02-29-release1/shaders/guest/advanced/ntsc/ntsc-pass2.slang"
filter_linear4 = "true"
wrap_mode4 = "clamp_to_border"
mipmap_input4 = "false"
alias4 = ""
float_framebuffer4 = "true"
srgb_framebuffer4 = "false"
scale_type_x4 = "source"
scale_x4 = "0.500000"
scale_type_y4 = "source"
scale_y4 = "1.000000"
shader5 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/shaders/guest/advanced/ntsc/ntsc-pass3.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 = "1.000000"
scale_type_y5 = "source"
scale_y5 = "1.000000"
shader6 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/shaders/guest/advanced/custom-fast-sharpen.slang"
filter_linear6 = "true"
wrap_mode6 = "clamp_to_border"
mipmap_input6 = "false"
alias6 = "LinearizePass"
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-guest-advanced-2024-02-29-release1/shaders/guest/advanced/crt-guest-advanced-ntsc-pass1.slang"
filter_linear7 = "true"
wrap_mode7 = "clamp_to_border"
mipmap_input7 = "false"
alias7 = "Pass1"
float_framebuffer7 = "false"
srgb_framebuffer7 = "false"
scale_type_x7 = "viewport"
scale_x7 = "1.000000"
scale_type_y7 = "source"
scale_y7 = "1.000000"
shader8 = "shaders_slang/hdr/shaders/crt-sony-megatron-source-pass.slang"
filter_linear8 = "false"
wrap_mode8 = "clamp_to_border"
mipmap_input8 = "false"
alias8 = "SourceSDR"
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/hdr/shaders/crt-sony-megatron-hdr-pass.slang"
filter_linear9 = "false"
wrap_mode9 = "clamp_to_border"
mipmap_input9 = "false"
alias9 = "SourceHDR"
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/hdr/shaders/crt-sony-megatron.slang"
filter_linear10 = "false"
wrap_mode10 = "clamp_to_border"
mipmap_input10 = "false"
alias10 = ""
float_framebuffer10 = "false"
srgb_framebuffer10 = "false"
textures = "SamplerLUT1;SamplerLUT2;SamplerLUT3;SamplerLUT4"
SamplerLUT1 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/shaders/guest/advanced/lut/trinitron-lut.png"
SamplerLUT1_wrap_mode = "clamp_to_border"
SamplerLUT1_mipmap = "false"
SamplerLUT2 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/shaders/guest/advanced/lut/inv-trinitron-lut.png"
SamplerLUT2_wrap_mode = "clamp_to_border"
SamplerLUT2_mipmap = "false"
SamplerLUT3 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/shaders/guest/advanced/lut/nec-lut.png"
SamplerLUT3_wrap_mode = "clamp_to_border"
SamplerLUT3_mipmap = "false"
SamplerLUT4 = "shaders_slang/crt-guest-advanced-2024-02-29-release1/shaders/guest/advanced/lut/ntsc-lut.png"
SamplerLUT4_wrap_mode = "clamp_to_border"
SamplerLUT4_mipmap = "false"
(presumes the “crt-guest-advanced-2024-02-29-release1” folder is extracted to shaders_slang)
This does not include any Afterglow passes nor settings.
3 Likes
1 Like
What’s the best way to play 480i stuff with Megatron?
I’ve been removing the scanlines from Megatron by setting the scanline min/max to 2.00. However, this makes the image way too bright. What’s the best way to deal with that?
Has anyone had any luck decoupling the interlacing stuff from guest’s shader?
3 Likes
Funnily enough, just about an hour ago, I was contemplating this exact scenario.
Maybe you can try 1.60 instead of 2.00?
You know you can use RetroArch’s built-in HDR implementation with any shader? You can start with whatever Peak and Paper White Luminance values you already use in your Sony Megatron presets for your display then just hack away at recalibrating Saturation, BrighBoost, Post Brightness and Gamma_C using your shader of choice.
I’ve gotten some pretty decent preliminary results out of a couple of my Mega Bezel presets but what you’ve asked about should probably be the next logical step.
Maybe the better approach might be to decouple the SDR to Tonemapping implementation of Sony Megatron Color Video Monitor (which might probably be redundant given that it’s already built into RetroArch)?
2 Likes
I think there may be an issue with the tonemapping in general. I’m playing around with it sans shaders and I cannot get it to not clip the highs. I’m using the SH2 map screen to test.
raw PCSX2
In RA, all the whites/greys get clipped and it’s just the same eye-searing white across the entire image. I haven’t been able to fix it via any combination of settings in the HDR menu but maybe I’ve missed something.
edit: probably worth mentioning that I’m running PCSX2 standalone and using the WindowCast core
2nd edit: disabling HDR via the RA menu doesn’t even fix the clipping, so now I’m leaning toward this being a WindowCast issue
2 Likes
If you’re running PCSX2 Standalone then you could probably try the ReShade port of Sony Megatron Color Video Monitor or Windows’ AutoHDR.
1 Like
I’m having a lot of problems with HDR in general, not specific to Megatron but each implementation seems to have it’s own issues.
Without shaders, the default HDR settings cause clipping and black crush. If I make the following adjustments, it solves it:
Peak Luminance 1000 Paper White 350 Contrast 5.6x
However, with Megatron loaded no amount of adjusting these settings in either the HDR settings menu or the shader settings solves the black crush or clipping.
And WindowCast seems to have it’s own issues, too. There’s a ton of clipping with all shaders disabled and no adjustments in the HDR menu solves it. 
With guest, the default settings in RA are pretty good but I have to raise contrast to 5.8x to pass the PLUGE. So it’s kinda just all over the place and I’ve resorted to creating multiple config files for now
2 Likes