Actually, thinking about this further, it might really be best to move the scanLineWeight * BLOOM_FACTOR out of the pow call. All this does is apply a nonlinear filter to the scanlines (why?), which should increase aliasing artifacts.

Another thought I had considered was using a quadratic Taylor series approximation to the gamma filter given by x^a ~= x*(1+(a-1)(x-1)), which works pretty well as in this quadratic approximation. A cubic approximation is even closer (but may not be necessary), as shown. But I note that someone seems to have had a similar idea here with these new "zfast" shaders, so perhaps those are already doing this sort of thing...

@clyde Thanks.

Hey everybody, I have a quick update for those who want xBRZ-like quality from the Raspberry Pi.

I ended up working around this by replacing RetroPie with Lakka, setting the full-screen resolution there to 1280x720 and using the 4xScaleHQ shader (in the scalehq directory).

Everything runs smooth, tried with numerous games on various platforms, including MDK on PlayStation 1. No lag in the menus either, and the image quality is fairly close to xBRZ (though, of course, you can still tell the difference). I am quite happy with this solution.

Another nice shader you can try is scalefx-hybrid.

@robmcc83 Only if it's supported by the emulator - but it doesn't seem so.
There is a libretro core for Vice (C64 emulator - port of VICE for libretro) in the experimental packages section, you could try and install it.

Most systems that display in 256x224 are stretched by the TV.

The NES' pixels are actually 1.2x wider than tall, probably the same for other systems as well.

@dankcushions said in Garbled Audio when crt shaders enabled:

the ‘new style’ xmb menu is not enabled in retropie by default. we use the old green menu for these kind of reasons. i guess your configs are all messed up and it’s using default retroarch settings, so all bets are off.

Yep. I got it fixed now. Not even sure how exactly but I noticed that my nes and gb system cfg files had a ton of stuff in there copied from the default retroarch. I just rebuilt them by hand and all is well now.

@xadox said in Different Shader Versions:

Is RetroPie using special optimized shaders for the pi?

it uses a curated subset of the shaders that have been shown to work well or work at all. many shaders in the libretro repo will crash or not work right.

@juice said in help setting vertical games with bezel and crt pi:

@dankcushions is there a way to delete all the cfg and start again, or do i need to make a fresh build. i would like to use you files as it is the way forward

where is the config file you posted above from?

I don't know if it's possible during the game, but it's such a great idea when the screensaver is displaying videos. I tried to set up once but failed, I only have now some blank images...

In order to conserve resources, I run my setup at 800x600 (hdmi_group=2 hdmi_mode=9).

I'm more fond of original aspect ratios so 720p/1080p is pointless for me. If I need to stretch the image to 16:9, I just use the telly/monitor menu.

To be a bit more clear: when selecting a non-working preset retroarch just dumps me back to the filter selection screen without making any changes.

There are a couple of themes which would work with this frame, like crt-centered:

alt text

But it would still be nice if the theme had the matching shader applied for the scanline/pixel smoothing effects...

Sorry to reply to such and old thread, but did you get it working? Trying to use crt-pi to and crt-pi vertical but it doesnt work. I have seperate config files for every arcade game, that change screen size and if its vertical or not. I copied from my retropie on raspberry pi, but crt-pi will not work. Load presents in retroarch menu doesnt work either.

Please ignore this - I found out what the problem was, I'd turned on Shader #0 Filter to LINEAR. That is what was causing this effect in lr-genesis-plus-gx.

I missed that the folder was shaders/shaders and not just /shaders.

Sometimes I can be too stupid to live. :D

Anyway, I applied the sharper settings and it's absolutely stunning.

It makes the display I was using before seemed smudged as compared to now.

I'm keeping this Shader forever since it looks so good.

Thank you all. :)

@ghogan42 said in lightweight LCD shader like CRT-pi?:

https://retropie.org.uk/forum/topic/13356/new-crt-lcd-shaders-for-rpi3-they-run-at-60fps-at-higher-resolutions-and-are-configurable

I just saw this and would like to say this these are beautiful! Thank you

@buzz said in Retropie 4.3 Retroarch Cheats and Shaders no longer Updatable.:

@phoenixjedi it's disabled from the GUI. Shaders are installed by default. The download menus are trouble as incompatible with our system in general. Easy enough to grab the cheats. Assets are handled via RetroPie-Setup. Check configuration/tools menu

There are missing shaders.. like the single pass HQ shaders, the fxaa shaders, etc. As well, no idea where to grab the cheats. I just copied em from the downloaded ones from 4.2 though.

i don't know the reason some shaders work and others don't, can't help you there sorry. but my best guess would be they are too powerful for the pi/ARM architecture and fail silently. with regard to this particular shader set, you might want to try using the files from the repo as they were just updated yesterday to "fix dumb typo" https://github.com/libretro/glsl-shaders/tree/master/ntsc