@mitu That is great information, thanks! I will have a play around with this.

EDIT: Worked like a charm, awesome. I never knew creating a custom shader would be this easy.

@retropieuser555 Thanks so much!

@dankcushions

Ah sorry missed read that - that makes more sense - ok good so it is doing nearest neighbour!

@ian_uk90 said in Shaders causing performance issues:

I’ve changed this to 1080p in the launch menu and now all games are running perfectly with shaders on!
Can anyone recommend an optimum resolution? Interested to see if any of the others may make further improvements.

1080p60 is the optimum really. any lower may increase performance if gpu is the bottleneck, but if it's already full speed it's not going to matter.

also, the crt scanline shaders require ~4 vertical pixels per emulated pixel for the scanlines to look decent, and 240x4=960, so 1080 is near the typical limit anyway.

finally, lower resolutions = more obvious scaling artefacts.

perhaps some of this info should be added to https://retropie.org.uk/docs/Shaders-and-Smoothing/ - will try and do this at some point today!

@dankcushions Thanks, I will try that

@dochartaigh said in "Core Override" for Shader NOT saving + changes Video settings on its own:

• Arcade/Mame/FBNeo, to change 3-4 player settings: For "in-game system menu options" (i.e. hold Start), those should automatically save a .fs file I'll be on the lookout for. ------ ones where I have to go into (Select+X) RetroArch Menu > Options to change the 3/4-player settings I'll try the "Create game-options file" which should safe a .opt file in /opt/retropie/configs/all/retroarch/config/fbneo)

like i said, you don't need to create a game-options file in lr-fbneo if these are dipswitch settings, as it will create unique entries for every game in the global /all/retroarch-core-options.cfg, so just change the setting and it will save automatically.

@dankcushions well, I have edited a few more configs and its all working fine. There is an option for resetting permissions - which I thought may have been the solution - if it happens again, that's what I'd probably try - because once it created the file itself it seemed to me ok.

I found another option for getting performance information logged - RetroArch performance counters: https://docs.libretro.com/guides/generating-retroarch-logs/

I haven't seen anything useful logged yet though :/

@crimson0087 Please use markdown if posting code to the forum (three backticks above and below the code)

You can edit your post and change this

Also - Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first (provide more details of system)

You can probably use the Configuration Editor and set the shader for all libretro based emulators. Daphne is not a libretro emulator, so the settings wouldn't apply anyway.

My favorite for all games is crt-pi, I love the look that the scanlines give. It looks good with everything from psx, to gba, to snes, to arcade.

@mitu ugh... got it. I see what you mean now.. "save core preset". That worked.

Thanks... and I also jumped on the bandwagon for the safe-shutdown script while I was at it. Works great as well... no more text when I shut down.

you're top dog for sure!

@diegomaradona21 said in Pi4 performance on Mame with CRT shaders:

ok thanks. I meant 2d games actually (maybe plus tekken and soul blade / edge but not a must). Is there any list of games supported by mame in 2003? or maybe which specific version of mame that is?

each version of MAME will have a corresponding gamelist.xml or dat file which contains the list of games it supports (however nothing about performance). there are compatibility lists linked in the retropie MAME docs but they are fairly broken right now (soon to be retired), and don't contain pi4 information.

soul blade and tekken's playstation versions will run great.

any cooling needed?

i use the flirc case which acts as a heatsink. never had any overheating issues, but it depends on your room temperature, humidity, ventilation, etc.

@sad_muso you didn't say what emulator you're using. afaik even simple shaders are often very system bus intensive, so they're constantly fighting for bandwidth with the GPU, CPU, etc. afair, lr-genesis-plus-gx really hammers the system bus, so try using lr-picodrive instead, if you're using the former.

Are they CPU/RAM intensive or both? Does the Pi 4 cope with shaders better than the 3 B?

first part answered above. pi 4 will cope better.

Do overlays cause any hit on performance, specifically when used in conjunction with shaders?

yes, for whatever reason they seem to.

What is the least expensive way to implement curve and scanlines that is currently in existence?

the way you're doing it already - z_pi_crt.

Hello!
Problem still persists.
Anyone got any luck fixing dgapt shader for newest Retroarch?

it depends on the shaders you are using now. for example, assuming you use 240p with your new CRT, a scanline shader would be pointless because a) 240p already shows scanlines on a CRT and b) 240p is not enough vertical resolution to allow fake scanlines to be rendered.

shaders that adjust the colour or fidelity of the image may or may not be useful or provide the desired effect, depending on what they are doing and how you are connected to your CRT.