Working Dreamcast games

quicksilver

@backstander problem is that a lot of issues we have with dreamcast, n64, psp and other demanding emulators is that they are unique problems to the raspberry pi. A lot of bug reports I have seen from rpi users are either ignored or you get the shoulder shrug and told to use something else.

barbudreadmon

@quicksilver @backstander you should consider switching to lr-reicast, i don't think performances are far apart as long as you properly set core options, and lr-reicast is a lot more active (afaik most improvements in standalone reicast are backports from lr-reicast).

quicksilver

@barbudreadmon lr-reicast is not available on raspberry pi last I heard

barbudreadmon

@quicksilver retropie needs to update its scripts then, the author of lr-reicast is testing the core on many platforms including the rpi.

quicksilver

@barbudreadmon you yourself said in another thread that trying to run lr-reicast on an RPI is "crazy" because standalone reicast doesnt function well. Has something changed recently?

barbudreadmon

@quicksilver Maybe a long time ago when there was no arm dynarec, no threaded rendering, no frameskip, ... Or perhaps are you talking about the crazy question everyone asked, aka "The oit renderer will be available on raspberry ?".

Now that all of this is togglable in lr-reicast through core options, there is barely any reason for it to perform worse than standalone.

quicksilver

@barbudreadmon thank you for your explanation. Is there a way to install lr-recaist manually? I would be happy to test it's performance on my pi.

BJRetro

@quicksilver I would be willing to test too if easy to install lr-reicast. I have had good success with standalone and have two setups so could leave one with standalone so I could pretty easily check how different if at all lr-reicast is with whatever settings are deemed proper.

hooperre

This post is deleted!

mitu

@quicksilver Since lr-reicast is already a scriptmodule, if you're willing to give it a try, this is what you need to modify

replace the rp_module_flags with

rp_module_flags=""

in the build_lr-reicast function, replace the single make line with

make platform=rpi3

Try to install from source, the lr-reicast scriptmodule should be in the experimental section.

At some point, I think the lr core was requiring GLES 3, so that's why it was excluded for the Pi, but maybe I'm mistaken.

EDIT: forgot to say, you'll have to modify the $HOME/RetroPie-Setup/scripts/libretro/lr-reicast.sh file. With the modifications from before, the compilation works (GG NO RE), but I havent' got time to test it with a game.

barbudreadmon

Btw, here are the settings that are good for speed :

Enable Threaded rendering
Set Alpha sorting to per-strip
Decrease resolution
Disable Texture Upscaling
Disable Modifier Volumes
Enable Div Matching
Disable DSP
Increase frameskip

quicksilver

@mitu build was successful but any game I launch just sends me back to ES.

@barbudreadmon is lr-recaist compatible with .chd files?

mitu

@quicksilver said in Working Dreamcast games:

build was successful but any game I launch just sends me back to ES.

Looks like a BIOS issue. Launch with verbose logging and look at the log file (/dev/shm/runcommand.log) and see where it's looking for them.

is lr-recaist compatible with .chd files?

It should be - https://github.com/libretro/reicast-emulator/pull/367.

pjft

Even with a CDI file it doesn't run.

https://pastebin.com/21U0SF8d

The last few lines suggest

[INFO] Environ UNSUPPORTED (#65585).
/opt/retropie/supplementary/runcommand/runcommand.sh: line 1006:  5554 Segmentation fault

barbudreadmon

Yes it is compatible with chd, the bioses go into [system]/dc/, [system] being your bios folder for RA cores, same dc_flash.bin and dc_boot.bin as standalone. For naomi support, the bioses are naomi.zip, awbios.zip, f355bios.zip, f355dlx.zip, hod2bios.zip and airlbios.zip from mame romset.

barbudreadmon

@pjft Seems like a no-bios issue too, at the very least i can reproduce a crash at the same moment if i delete my bioses. It might be a good idea to update your RA too, yours might be too old (cf. the Environ UNSUPPORTED messages)

pjft

@barbudreadmon ah, that's fair. My RA is indeed a bit outdated by today's standards.

The BIOS did seem to load in lines 192 and 194 but it might be RA related.

Thanks!

WarC0zes

I tested lr-reicast, but no games are launched, it comes back emulationstation.
I have the bios in Retropie/Bios/dc/
I have this as error : /opt/retropie/supplementary/runcommand/runcommand.sh : ligne 1003 : 5513 Segmentation error

https://pastebin.com/LqnvXhmU

My settings:
Retropie 4.4.8
Rpi 3 B
ES 1.8.1
RA 1.7.6

quicksilver

@barbudreadmon so I updated retroarch to latest version and made sure my bioses are in /BIOS/dc but after launching a game it still kicks me back to emulation station

mitu

I had the same crash while testing, but followed This comment on the Issue tracker and now the core starts.
Only tested Ikaruga (from a .chd) and started a game, looks a bit choppier than the standalone. Note that I didn't apply all the settings that @barbudreadmon mentioned, I only made sure Enable Threaded rendering and put a frameskip of 1 just to check. I suspect lowering the resolution would also help, but remains to be tested further.