I.K.E.M.E.N GO on Raspberry Pi 4 [Now with an Install Guide!]

SuperFromND

@superfromnd said in I.K.E.M.E.N GO on Raspberry Pi 4:

this should be fixed shortly after this post's publication!

Okay so uh, clearly it hasn't haha. At the very least, I figured out the cause and a temporary, if extremely clunky, workaround: pop open the file /home/pi/RetroPie/ports/ikemen-go/external/script/options.lua and find this line:

if itemname == 'gamespeed' then return config.GameSpeed .. '%' end

and change it to this:

if itemname == 'gamespeed' then return '100%' end

Note that, as you can probably see, doing this will break the "Game Speed" option in the options menu.

SuperFromND

UPDATE: Glad to report this is no longer the case! The game now works when compiling from source once again. :)

@superfromnd said in [I.K.E.M.E.N GO on Raspberry Pi 4]

(Oh, quick side note; don't try to compile IKEMEN GO right this moment at the time of this post; some commits that shouldn't have been pushed yet were pushed, and as a result the game crashes on startup due to the game trying to read a nonexistent parameter in save/config.json; this should be fixed shortly after this post's publication!)

MrRussellgro

Hey, so I want to get this for my RetroPie console, but how do I get it to work? Do I just download it from the Ports section from the online menu?

SuperFromND

@mrrussellgro said in I.K.E.M.E.N GO on Raspberry Pi 4:

Hey, so I want to get this for my RetroPie console, but how do I get it to work? Do I just download it from the Ports section from the online menu?

It's not currently included in RetroPie, so you'll have to manually add it to the Ports section in RetroPie's setup menu in order to install it. Here's a guide on how to do that:

What You'll Need

Some form of FTP client. I use and highly recommend WinSCP, though I've also heard Cyberduck is pretty good.
This .sh file. If you see the script's text but don't get prompted for a download (which is the case in Chrome), just press Ctrl + S to save it as a file.

Installation

If you haven't already done so, update RetroPie-Setup to the latest version and enable SSH.
Using your FTP client, connect to your Raspberry Pi.
Navigate to the directory /home/pi/RetroPie-Setup/scriptmodules/ports. In WinSCP, you can simply copy-and-paste the above text into the address bar and it will take you straight to it. You should see a bunch of .sh files.
Drag and drop ikemen-go.sh into this directory.
Once that's done being transferred, now you can start RetroPie-Setup and navigate over to Ports and, if you did this correctly, IKEMEN GO should be installable from there.

Installation should take somewhere between 15 to 30 minutes on a fresh image.
Usage notes / documentation pertaining to IKEMEN GO are currently available here.

MrRussellgro

@superfromnd So I followed your steps, though I used a USB transfer to my Pi, but it won't launch the game. Anything I'm doing wrong?

SuperFromND

@mrrussellgro A few things might have gone wrong!

Are you running on a Pi 4?
Are you using a Buster-based version of RetroPie (4.6 or later)?
Check the file /dev/shm/runcommand.log for any errors or issues.

MrRussellgro

@superfromnd said in I.K.E.M.E.N GO on Raspberry Pi 4:

@mrrussellgro A few things might have gone wrong!

Are you running on a Pi 4?

Are you using a Buster-based version of RetroPie (4.6 or later)?

Check the file /dev/shm/runcommand.log for any errors or issues.

I'm on Raspberry Pi 4.
I believe I have version 4.7.12 of RetroPie. I might have to look again.

SuperFromND

@mrrussellgro Hm, is there anything in /dev/shm/runcommand.log? What about /opt/retropie/ports/ikemen-go/Ikemen.log?

MrRussellgro

@superfromnd So how can I look into those?

SuperFromND

@mrrussellgro Assuming SSH is enabled, you should be able to view them just by using an FTP client and navigating to /dev/shm; the runcommand.log file should be there after attempting to run IKEMEN GO from EmulationStation.

Since you mentioned using USB transfer, did you by chance place ikemen-go.sh directly into a ROM folder instead of your RetroPie-Setup scriptmodules folder by mistake? I don't believe that USB transfer is able to identify and transfer a scriptmodule into the RetroPie-Setup menu (though I could be wrong).

TheSnackist

@superfromnd I take it there is no way this will work on a RPi 3b? with the price of Raspberry Pis I guess I have no excuse not to get a Pi 4

SuperFromND

@thesnackist I haven't tested on a Pi 3, admittedly! Though I wouldn't be surprised if something is missing on the Pi 3 that was added in the Pi 4's hardware when it switched to the A72 CPU.

TheSnackist

@superfromnd gonna give it another go tonight, maybe I will have better luck (last time it was having trouble reaching GitHub for some reason...)

MrRussellgro

@superfromnd I will have to look into the roms folder and tell you if I have it installed there.

SuperFromND

Status update: one of the dependencies for IKEMEN GO, specifically this one, was updated and now explicitly requires Golang version 1.14 or newer. Problem: Best I can tell, Raspbian Buster has no native package for any Go version above 1.11. For the time being this effectively breaks the scriptmodule, but the upcoming Raspbian Bullseye should fix this, as it updates the Golang package to v1.15. Still out of date, but well within the range that can compile IKEMEN GO.

There's also the option of manually compiling the latest version of Golang to use in the scriptmodule, but I don't think any modules in RetroPie do anything like this yet, so I have no idea how to go about doing that. (If any veteran scriptmodule devs are reading this and I happen to be wrong, let me know!)

SuperFromND

Update again! Turns out there actually is precedence for manually installing non-package dependencies in RetroPie (thank you @mitu for pointing this out), and it happens to be a version of Golang too!

I wasn't sure if there was any particular reason the script installs v1.8, so to be safe, I made a duplicate of the golang.sh module that installs Golang v1.17 and then updated the IKEMEN GO scriptmodule to use it. Unfortunately, I'm running into a little problem with this setup: when trying to compile, I'm getting an error:

# Excerpt of scriptmodule code
function build_ikemen-go() {
    local goroot="$(_get_goroot_golang-1.17)" # Resolves to /opt/retropie/supplementary/golang-1.17
    export GOPATH="$md_build"
    export GOROOT="$goroot"

    "$goroot/bin/go" clean -modcache
    make TAGS='-tags al_cmpt' linux
    # (etc.)
}

# Result when ran
$GOPATH/go.mod exists but should not

Apparently, you can't have GOPATH set to a location with a Go module file contained within it. I went with that path because the module that used Golang in RetroPie, scraper, also uses $md_build as GOPATH. "But no problem", I thought, "I'll just remove the GOPATH variable declaration and let Go figure it out". So I tried that, but it also resulted in a failed compile:

# Excerpt of scriptmodule code
function build_ikemen-go() {
    local goroot="$(_get_goroot_golang-1.17)" # Resolves to /opt/retropie/supplementary/golang-1.17
    export GOROOT="$goroot"

    "$goroot/bin/go" clean -modcache
    make TAGS='-tags al_cmpt' linux
    # (etc.)
}

# Result when ran
...
go: downloading github.com/hajimehoshi/go-mp3 v0.3.0
go: downloading github.com/hajimehoshi/oto v0.7.1
go: downloading github.com/pkg/errors v0.9.1
go: downloading github.com/jfreymuth/vorbis v1.0.0
/opt/retropie/supplementary/golang-1.17/src/net/dnsclient.go:11:2: non-standard import "golang.org/x/net/dns/dnsmessage" in standard package "net"
make: *** [Makefile:32: Ikemen_GO] Error 1

So I looked up the non-standard import error, and according to Stackoverflow, the solution to this error is setting GOPATH to $HOME/go. Sounds good, except for one small problem: $HOME/go is the default path that Go uses when no GOPATH is specified. In other words, we're already using $HOME/go as GOPATH here!

I'm sure I'm probably missing something; any Go-savvy folks who can help out here?

SuperFromND

Alright, I figured out how to make it work after some trial and error. I ended up abandoning the Makefiles that IKEMEN GO's source code supplies in order to get it to always use Go 1.17, and that seems to have fixed the problem.

If you want to give this scriptmodule a try, here's the updated instructions on how to do so (I'll assume you have some level of savviness with RetroPie already):

Step 0: Make sure you've updated RetroPie-Setup, and possibly also made a backup if you want to be safe.
Step 1: Download ikemen_go.sh and place it in /home/pi/RetroPie-Setup/scriptmodules/ports.
Step 2: Download golang-1.17.sh and place it in /home/pi/RetroPie-Setup/scriptmodules/supplementary.
Step 3: Start RetroPie-Setup, navigate to Manage Packages, then Experimental packages, then scroll down to ikemen-go. From there, install it. Give it about 20-40 minutes to install.
Step 4: Exit RetroPie-Setup and restart EmulationStation. If done correctly, IKEMEN GO should be available via the Ports screen, ready to launch.

MrRussellgro

So I dragged my from from the game on the PC version, but the screenpack is still stuck on the default one. I even changed the config file.

SuperFromND

@mrrussellgro At a wild guess, it might be that either save/config.json or the screenpack itself is pointing to files using non-case-sensitive filenames. Works well enough on Windows which is case insensitive, but not so much on Linux.

MrRussellgro

@superfromnd Like I've said, I've changed my screenpack. I am wanting to use a bigger roster size to extend the character select screen. This is a screenpack I want to use: https://mugenguild.com/forum/PHPSESSID.7bb5383t2ah28a5jjp5iaded8q/topics/simplemugen-simplistic-mugen-battle-2021-193231.0.html