[Solved] Curvature shaders shows zebra lines

prog-amateur

Hello as the title says, when I select Curvature shaders in Emulation Station menu, I can play with the CRT effects, but zebra lines appear at the four corners of the screen (especially when screen is white like on SEGA logo in Sonic Games).

I have a bartop with a 4:3 screen (I don’t know the exact resolution). Interesting fact is that I have the same phenomenon on the Retroid Pocket 2+, also equipped with a 4:3 screen. I wonder if the ratio aspect could be the reason of my problem (I partially improved the situation by modifying the warpX and warpY parameters of the shader without retroarch but with Batocera, I don’t know how to modify that).

What do you think and especially what can I do to solve these artifacts? Thank you !

Atari

Have you reported this to the maintainer of that shader?

prog-amateur

Atari No because after reading your comment and looking on the libretro shaders forum, it seems that it is a known issue that is not solved and where people can reduce the effects by changing the parameters on a case-by-case basis with compromises, but no miracle recipe seems to have been found.

Can I manually add a shader in the Emulation Station menu (or replace this Curvature option by a CRT-Lottes by modifying a config file)?

Thanks

Atari

Yes of course. Refer to this and the section below it: https://wiki.batocera.org/emulationstation:shaders_set#but_i_want_to_use_my_own_shaders_which_i_downloaded_from_the_internet

prog-amateur

Atari Hello, thank you very much ! Just to feedback that I have followed the wiki and added :
megadrive-renderer.shader=crt/crt-lottes-multipass-interlaced-glow

and I have done this to several consoles with success. It would be nice to have a global config, but it is really good to have at least this alternative.

Atari

global-renderer.shader doesn’t work?
Hm… well this key is going to be removed in the future as its functionality is defunct. You should use the shader set for your own shaders moving forward.