core geolit

[ronipetersondasilva]

I have a Question: it's possible install the core geolit on Pi4 using RGB-PI Extras?

Some Neo Geo games homebrew only ruim using this core

Exe: Gladmort . Amazing game, don´t run on RGB-PI OS due to this.

[riggles1]

It's doable, you'll have to build the core on the Pi4 (use putty to get into the Pi's terminal through wifi, login as the root user, user and password has been discussed in issues here before), compile and build the core according to the libretro documentation.

Put the newly compiled geolith .so core in "RGBPi-Extra/application/data/new_cores/" as well as an .info file (can be taken from PC retroarch).

Then make a new addition to rgbpi extras by doing the following:

Then edit the "new_cores.dat" file to include your new system entry, setting what file formats it uses and what the rom folder it scans from is named. Format it the same way as the other examples.

Lastly, optionally you can add core option defaults through the cores.cfg in that same folder, if there are specific default options you want to be applied.

I'd go into more detail, but you can play gladmort through the fbneo core just fine, provided that you have the game in the standard fbneo .zip format. (both demo and full).

[ronipetersondasilva]

Unfortunately, I don't know how to compile cores, etc. I asked Kiev if he knew how, and he asked me to open a thread here to see if you could help me. I have the ROM for the current romset and the updated core, but unfortunately it's not running, so I need the Geolit ​​core so I can run the .NEO games.

If you could compile this, I would be eternally grateful.

[riggles1]

Log into the pi4 using Putty on Windows (connected to the same home network, get the Pi4 IP number from the menu)

Then just type or copy paste the following lines, one by one:

git clone --depth 1 https://github.com/libretro/geolith-libretro

cd geolith-libretro

cd libretro

make -j4

(cd = change directory, you're navigating to the libretro build folder of the source code in order to compile it)

(make will build according to the dev made make file, -j4 means it will use the 4 cores of the Pi to process the compilation
for other cores it may be "make -j4 -f Makefile.libretro" instead)

For geolith you'll need the aes.zip and neogeo.zip in your System/BIOS folder for retroarch (USB drive)
They're both available in the modern 279 MAME merged romset.

After it finishes building, you can navigage to the geolith-libretro folder with WinSCP (same user and password)
Go to, "root/geolith-libretro/libretro/" and grab the geolith_libretro.so which is the newly compiled core.
You'll need the info file, which you can take from here: https://docs.libretro.com/library/geolith/ (libretro docs has them, scroll down to core info file, click the link then click "download raw file" on the github page)

Next just put the new .so and .info file in "/opt/retroarch/cores/" on the pi using WinSCP

There you go, a newly updated and compiled core, ready for Pi4 usage. Very useful to know for updating other cores to new versions.

Since this core is new and not just an update, you'll need to make a new entry for it for rgbpi.
Navigate to "/opt/rgbpi/ui/data" edit the systems.dat, add the following line at the very end:

"geolith","NeoGeo",1990,"SNK",".neo|.zip",

(the rom folder name, the name of the system, release year, developer, file extensions)

Finally, on the USB drive there's core association file, "gameconfig/sys_overide/systems_cores.cfg"
It should look like this, with the geolith core added, this means that games in the "geolith" rom folder uses the geolith .so core to lauch:

[Systems]
nds = launchnds.bash
nes = mesen_libretro.so
zapper = zapper_libretro.so
segachannel = genesis_plus_gx_exp_libretro.so
bennugd = bennugd_libretro.so
pcfx = mednafen_pcfx_libretro.so
mesenx = mesenx_libretro.so
geolith = geolith_libretro.so

Optionally instead of putting the .so and .info in the cores folder manually in the "application/data/new_cores" folder of the RGBPi-Extra scripts.
Then edit the !new_cores.dat that's in there, and add the following line at the end.

"geolith","NeoGeo",1990,"SNK",".neo|.zip","geolith_libretro.so",

[riggles1]

RGBPi-Extra is updated with the geolith core, install by redownloading rgbpi-extra, extract and copy everything (important) to the USB script folder in roms, then install the core.

You can also manually compile/add it yourself through WinSCP using the instructions in my reply.

[ronipetersondasilva]

Thank you so much @riggles1 I really appreciate your kindly help!!!