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

SuperFromND

Sadly, I've still made no progress on this project, and quite frankly I don't think I will for the forseeable future. My skillset and understanding of IKEMEN is simply not good enough to figure out the cause of, and fix, these bugs.

Semi-related, however, I have released this early version of a tool that can generate IKEMEN's movelist.dat for characters, from existing .cmd files. Movelist.dat's are used to display in-game command inputs for special and super moves, for the sake of quality-of-life, so this is very nice to have.

SuperFromND

Good news: turns out the OpenAL error can be solved by just using a different build file, build_cmpt.sh instead of just build.sh.

Bad news: Still crashes on startup. Same errors as before. I suspect it has something to do with the oto repository for sound that's mentioned in the crash logs, or something OpenAL is doing that the Pi 4 doesn't support.

SuperFromND

Been a while since I've messed with this (and not a whole lot has happened since January), but here's a recap of the past five months of this project's progress:

Sometime in February: One of IKEMEN GO's lead developers, Gacel (otherwise known as Windblade-GR01) acquired a Raspberry Pi 4 and stated that they would look into it at some point in the future; they stated this back in February and I haven't heard anything about it since then (presumably they've been focused on the engine itself before looking into supporting an admittedly niche platform like the Pi).
Later in February: It appears that the build scripts for Linux builds of IKEMEN GO in general were a bit scuffed, as multiple users in the IKEMEN GO Discord server as well as at least one guy on GitHub reported issues trying to compile from source (specifically the cp -r /external/icons issue in the OP, as well as pointing out that you need screenpack files from an entirely different repo to get the engine to boot at all).
Just this morning: I tried to compile IKEMEN from Windblade's fork again, from a completely fresh install of Raspbian, and this time I got a brand new error, seemingly independent from IKEMEN itself and more to do with the ARM Golang compiler tools itself:

pi@raspberrypi:~/Desktop/Stuff/Ikemen-GO/build $ sudo ./build_cmpt.sh 
# github.com/Windblade-GR01/Ikemen_GO/src/src
/usr/lib/go-1.11/pkg/tool/linux_arm/link: running gcc failed: exit status 1
/tmp/go-link-774418994/000000.o: file not recognized: file format not recognized
collect2: error: ld returned 1 exit status

(Excerpt courtesy of XKCD #2259):
An image depicting stick figure having complications with technology. Someone asks the figure "Are you sure you're okay?", to which the figure responds "I'm fine and I believe in ghosts now!"

Other than that, nothing much has happened sadly.

SuperFromND

Gacel responded, and he stated the main reason that his fork can't compile on Pi seems to be certain dependencies, written with platform-specific C++ code that can't be compiled on the Pi.

Ouch.

SuperFromND

That mysterious compilation error from last time seems to have been a fluke, as I just re-cloned the repository and was able to successfully compile an executable again. After cloning the default screenpack I gave it a test, but unfortunately it still crashes. At least we're back to this crash log (welcome back, devil-I-know):

pi@raspberrypi:~/Desktop/Stuff/Ikemen-GO/bin $ sudo ./Ikemen_GO_linux 
fatal error: unexpected signal during runtime execution
[signal SIGSEGV: segmentation violation code=0x1 addr=0x6d610071 pc=0xb5f9ce44]
 
runtime stack:
runtime.throw(0x58b2ec, 0x2a)
	/usr/lib/go-1.11/src/runtime/panic.go:608 +0x5c
runtime.sigpanic()
	/usr/lib/go-1.11/src/runtime/signal_unix.go:374 +0x22c
 
goroutine 1 [syscall, locked to thread]:
runtime.cgocall(0x49e040, 0x4e7fbac, 0x15e6160)
	/usr/lib/go-1.11/src/runtime/cgocall.go:128 +0x5c fp=0x4e7fb90 sp=0x4e7fb78 pc=0x51688
github.com/sqweek/dialog._Cfunc_msgdlg(0x0, 0x0, 0x3, 0x1, 0x8c152cf0, 0x0)
	_cgo_gotypes.go:397 +0x38 fp=0x4e7fba8 sp=0x4e7fb90 pc=0x21d4e8
github.com/sqweek/dialog.runMsgDlg(0x56daf1, 0x5, 0x0, 0x3, 0x1, 0x14b1d80, 0x0)
	/root/go/pkg/mod/github.com/sqweek/dialog@v0.0.0-20200911184034-8a3d98e8211d/dlgs_linux.go:34 +0x80 fp=0x4e7fbe0 sp=0x4e7fba8 pc=0x21d73c
github.com/sqweek/dialog.(*MsgBuilder).error(0x14b1d80)
	/root/go/pkg/mod/github.com/sqweek/dialog@v0.0.0-20200911184034-8a3d98e8211d/dlgs_linux.go:51 +0x44 fp=0x4e7fc00 sp=0x4e7fbe0 pc=0x21d8a0
github.com/sqweek/dialog.(*MsgBuilder).Error(0x14b1d80)
	/root/go/pkg/mod/github.com/sqweek/dialog@v0.0.0-20200911184034-8a3d98e8211d/dlgs.go:61 +0x1c fp=0x4e7fc08 sp=0x4e7fc00 pc=0x21d074
main.main()
	/home/pi/Desktop/Stuff/Ikemen-GO/src/main.go:94 +0x53c fp=0x4e7ffc4 sp=0x4e7fc08 pc=0x375654
runtime.main()
	/usr/lib/go-1.11/src/runtime/proc.go:201 +0x204 fp=0x4e7ffe4 sp=0x4e7ffc4 pc=0x7b56c
runtime.goexit()
	/usr/lib/go-1.11/src/runtime/asm_arm.s:867 +0x4 fp=0x4e7ffe4 sp=0x4e7ffe4 pc=0xa4970
 
goroutine 34 [sleep]:
time.Sleep(0x989680, 0x0)
	/usr/lib/go-1.11/src/runtime/time.go:105 +0x14c
main.(*System).soundWrite(0x8bb2a0)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/system.go:661 +0x330
created by main.(*System).audioOpen
	/home/pi/Desktop/Stuff/Ikemen-GO/src/system.go:649 +0xc4
 
goroutine 36 [syscall]:
github.com/hajimehoshi/oto._Cfunc_snd_pcm_writei(0x9c5fb7a8, 0x4aa1a80, 0x5be, 0x0)
	_cgo_gotypes.go:173 +0x38
github.com/hajimehoshi/oto.(*driver).TryWrite.func1(0xc73260, 0x9c5fb7a8, 0x4aa1a80, 0x5be, 0x0)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/driver_linux.go:143 +0xcc
github.com/hajimehoshi/oto.(*driver).TryWrite(0xc73260, 0xde8010, 0xf0, 0x7ff0, 0x0, 0x0, 0x0)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/driver_linux.go:143 +0x1a0
github.com/hajimehoshi/oto.(*driverWriter).Write(0xcc46e0, 0xde8000, 0x100, 0x8000, 0x0, 0x0, 0x0)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/context.go:148 +0xd4
io.copyBuffer(0x629030, 0xcc46e0, 0x629048, 0xd54330, 0xde8000, 0x8000, 0x8000, 0x0, 0x0, 0x0, ...)
	/usr/lib/go-1.11/src/io/io.go:404 +0x1b0
io.Copy(0x629030, 0xcc46e0, 0x629048, 0xd54330, 0x0, 0x0, 0x0, 0x0)
	/usr/lib/go-1.11/src/io/io.go:364 +0x48
github.com/hajimehoshi/oto.NewContext.func1(0xcf2520)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/context.go:85 +0x38
created by github.com/hajimehoshi/oto.NewContext
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/context.go:84 +0x18c
 
goroutine 37 [select]:
io.(*pipe).Write(0xd54360, 0xdb20f0, 0x43f8, 0x43f8, 0xf0, 0x0, 0x0)
	/usr/lib/go-1.11/src/io/pipe.go:87 +0x14c
io.(*PipeWriter).Write(0xcc2bb0, 0xdb2000, 0x44e8, 0x44e8, 0x0, 0xdb0000, 0x4e10000)
	/usr/lib/go-1.11/src/io/pipe.go:153 +0x38
github.com/hajimehoshi/oto.(*Player).Write(0xcc4720, 0xdb2000, 0x44e8, 0x44e8, 0x113a, 0x1, 0x0)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/player.go:60 +0x40
github.com/faiface/beep/speaker.update()
	/root/go/pkg/mod/github.com/faiface/beep@v1.0.2/speaker/speaker.go:129 +0x184
github.com/faiface/beep/speaker.Init.func1()
	/root/go/pkg/mod/github.com/faiface/beep@v1.0.2/speaker/speaker.go:52 +0x18
created by github.com/faiface/beep/speaker.Init
	/root/go/pkg/mod/github.com/faiface/beep@v1.0.2/speaker/speaker.go:48 +0x1d8
 
goroutine 20 [syscall]:
syscall.Syscall(0x3, 0x0, 0xed0000, 0x1000, 0x0, 0x59501, 0xfa940)
	/usr/lib/go-1.11/src/syscall/asm_linux_arm.s:14 +0x8
syscall.read(0x0, 0xed0000, 0x1000, 0x1000, 0xed2001, 0x0, 0x0)
	/usr/lib/go-1.11/src/syscall/zsyscall_linux_arm.go:732 +0x40
syscall.Read(0x0, 0xed0000, 0x1000, 0x1000, 0x0, 0x1, 0x1)
	/usr/lib/go-1.11/src/syscall/syscall_unix.go:172 +0x34
internal/poll.(*FD).Read(0xc84000, 0xed0000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
	/usr/lib/go-1.11/src/internal/poll/fd_unix.go:165 +0xf0
os.(*File).read(0xc70130, 0xed0000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
	/usr/lib/go-1.11/src/os/file_unix.go:249 +0x3c
os.(*File).Read(0xc70130, 0xed0000, 0x1000, 0x1000, 0x1000, 0x1000, 0x0)
	/usr/lib/go-1.11/src/os/file.go:108 +0x4c
bufio.(*Scanner).Scan(0xc20fa4, 0x0)
	/usr/lib/go-1.11/src/bufio/scan.go:213 +0x88
main.(*System).init.func1(0x8bb2a0)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/system.go:546 +0xac
created by main.(*System).init
	/home/pi/Desktop/Stuff/Ikemen-GO/src/system.go:544 +0x684
pi@raspberrypi:~/Desktop/Stuff/Ikemen-GO/bin $

Side note: one of the fellows in the IKEMEN Discord by the name of MangeX pointed out that the OpenAL issues may have been caused by a missing folder, include/AL from the main OpenAL repository, that wasn't in Windblade's OpenAL fork. This ultimately proved to be redundant information since the issue seemingly fixed itself if my most-recent compilation test is any indication, but if it crops up again at least I have some sort of ~~scapegoat to blame~~ cause to troubleshoot,

SuperFromND

So a few hours after I made my last post, Gacel pointed out that I was compiling using Go 1.11, since that's the version of Go that you get when using apt-get install. However, it turns out the latest version of Go is 1.16, so he suggested I install that instead. After a tiny bit of fiddling around with Linux (and a slight modification to the build_cmpt.sh script since, for some reason, shell scripts didn't acknowledge my manual Golang installation) I compiled the executable again and... it crashed. But it crashed slightly differently than before:

pi@raspberrypi:~/Desktop/Stuff/Ikemen-GO/bin $ sudo ./Ikemen_GO_linux 
fatal error: unexpected signal during runtime execution
[signal SIGSEGV: segmentation violation code=0x1 addr=0x6d610071 pc=0xb600be44]
 
runtime stack:
runtime.throw(0x542794, 0x2a)
	/usr/local/go/src/runtime/panic.go:1117 +0x5c
runtime.sigpanic()
	/usr/local/go/src/runtime/signal_unix.go:718 +0x224
 
goroutine 1 [syscall, locked to thread]:
runtime.cgocall(0x4a2c90, 0x2aedb90, 0x289bfb0)
	/usr/local/go/src/runtime/cgocall.go:154 +0x5c fp=0x2aedb78 sp=0x2aedb60 pc=0x52490
github.com/sqweek/dialog._Cfunc_msgdlg(0x0, 0x0, 0x3, 0x1, 0x8d2ad550, 0x0)
	_cgo_gotypes.go:404 +0x34 fp=0x2aedb8c sp=0x2aedb78 pc=0x228db8
github.com/sqweek/dialog.runMsgDlg(0x52426f, 0x5, 0x0, 0x3, 0x1, 0x2aeddcc, 0x0)
	/root/go/pkg/mod/github.com/sqweek/dialog@v0.0.0-20200911184034-8a3d98e8211d/dlgs_linux.go:34 +0x90 fp=0x2aedbd8 sp=0x2aedb8c pc=0x228fe8
github.com/sqweek/dialog.(*MsgBuilder).error(...)
	/root/go/pkg/mod/github.com/sqweek/dialog@v0.0.0-20200911184034-8a3d98e8211d/dlgs_linux.go:51
github.com/sqweek/dialog.(*MsgBuilder).Error(...)
	/root/go/pkg/mod/github.com/sqweek/dialog@v0.0.0-20200911184034-8a3d98e8211d/dlgs.go:61
main.main()
	/home/pi/Desktop/Stuff/Ikemen-GO/src/main.go:94 +0x58c fp=0x2aedfb8 sp=0x2aedbd8 pc=0x377750
runtime.main()
	/usr/local/go/src/runtime/proc.go:225 +0x26c fp=0x2aedfe4 sp=0x2aedfb8 pc=0x8766c
runtime.goexit()
	/usr/local/go/src/runtime/asm_arm.s:841 +0x4 fp=0x2aedfe4 sp=0x2aedfe4 pc=0xb7cbc
 
goroutine 4 [sleep]:
time.Sleep(0x989680, 0x0)
	/usr/local/go/src/runtime/time.go:193 +0x100
main.(*System).soundWrite(0x7af798)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/system.go:661 +0x354
created by main.(*System).audioOpen
	/home/pi/Desktop/Stuff/Ikemen-GO/src/system.go:649 +0xc4
 
goroutine 20 [syscall]:
github.com/hajimehoshi/oto._Cfunc_snd_pcm_writei(0x9c8836a8, 0x35a8000, 0x5be, 0x0)
	_cgo_gotypes.go:173 +0x34
github.com/hajimehoshi/oto.(*driver).TryWrite.func1(0x208e300, 0x2208000)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/driver_linux.go:143 +0xb4
github.com/hajimehoshi/oto.(*driver).TryWrite(0x208e300, 0x22080a8, 0x58, 0x7f58, 0x0, 0x0, 0x0)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/driver_linux.go:143 +0x15c
github.com/hajimehoshi/oto.(*driverWriter).Write(0x20d2060, 0x2208000, 0x100, 0x8000, 0x0, 0x0, 0x0)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/context.go:148 +0xe0
io.copyBuffer(0x5cecd8, 0x20d2060, 0x5cecec, 0x2092300, 0x2208000, 0x8000, 0x8000, 0x0, 0x0, 0x0, ...)
	/usr/local/go/src/io/io.go:425 +0x1c0
io.Copy(...)
	/usr/local/go/src/io/io.go:382
github.com/hajimehoshi/oto.NewContext.func1(0x20d04e0)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/context.go:85 +0x58
created by github.com/hajimehoshi/oto.NewContext
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/context.go:84 +0x1e8
 
goroutine 21 [select]:
io.(*pipe).Write(0x2090240, 0x21dce48, 0x16a0, 0x16a0, 0x2e48, 0x0, 0x0)
	/usr/local/go/src/io/pipe.go:94 +0x148
io.(*PipeWriter).Write(0x21c62c8, 0x21da000, 0x44e8, 0x44e8, 0x113a, 0x1, 0x0)
	/usr/local/go/src/io/pipe.go:163 +0x38
github.com/hajimehoshi/oto.(*Player).Write(...)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/player.go:60
github.com/faiface/beep/speaker.update()
	/root/go/pkg/mod/github.com/faiface/beep@v1.0.2/speaker/speaker.go:129 +0x190
github.com/faiface/beep/speaker.Init.func1()
	/root/go/pkg/mod/github.com/faiface/beep@v1.0.2/speaker/speaker.go:52 +0x18
created by github.com/faiface/beep/speaker.Init
	/root/go/pkg/mod/github.com/faiface/beep@v1.0.2/speaker/speaker.go:48 +0x1d4
 
goroutine 22 [syscall]:
syscall.Syscall(0x3, 0x0, 0x213a000, 0x1000, 0x1154ec, 0xff800000, 0x7ff)
	/usr/local/go/src/syscall/asm_linux_arm.s:14 +0x8
syscall.read(0x0, 0x213a000, 0x1000, 0x1000, 0x0, 0x1, 0x1)
	/usr/local/go/src/syscall/zsyscall_linux_arm.go:686 +0x40
syscall.Read(...)
	/usr/local/go/src/syscall/syscall_unix.go:187
internal/poll.ignoringEINTRIO(...)
	/usr/local/go/src/internal/poll/fd_unix.go:581
internal/poll.(*FD).Read(0x2070000, 0x213a000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
	/usr/local/go/src/internal/poll/fd_unix.go:162 +0x118
os.(*File).read(...)
	/usr/local/go/src/os/file_posix.go:31
os.(*File).Read(0x2010178, 0x213a000, 0x1000, 0x1000, 0x0, 0x0, 0x0)
	/usr/local/go/src/os/file.go:117 +0x5c
bufio.(*Scanner).Scan(0x20287a4, 0x0)
	/usr/local/go/src/bufio/scan.go:214 +0x88
main.(*System).init.func1(0x7af798)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/system.go:546 +0x9c
created by main.(*System).init
	/home/pi/Desktop/Stuff/Ikemen-GO/src/system.go:544 +0x5c4

Just parsing the log, I noticed the difference (aside from some hex values and routine numbers) was from a section mentioning the intro, so I assumed the problem was related to IKEMEN's intro cutscene included in the default motif. Another fellow in the IKEMEN Discord named Amavect chimed in and told me to check Ikemen.log, thinking that it might be a problem with the LUA code that IKEMEN also uses. After opening the log, this is what I saw:

failed to compile #version 150 core

//vertex position
in vec2 vert;

//pass through to fragTexCoord
in vec2 vertTexCoord;

//window res
uniform vec2 resolution;

//pass to frag
out vec2 fragTexCoord;

void main() {
   // convert the rectangle from pixels to 0.0 to 1.0
   vec2 zeroToOne = vert / resolution;

   // convert from 0->1 to 0->2
   vec2 zeroToTwo = zeroToOne * 2.0;

   // convert from 0->2 to -1->+1 (clipspace)
   vec2 clipSpace = zeroToTwo - 1.0;

   fragTexCoord = vertTexCoord;

   gl_Position = vec4(clipSpace * vec2(1, -1), 0, 1);
} : 0:1(10): error: GLSL 1.50 is not supported. Supported versions are: 1.10, 1.20, 1.00 ES, and 3.00 ES
  
goroutine 1 [running, locked to thread]:
github.com/yuin/gopher-lua.(*LState).PCall.func1(0x54a358, 0x1e16000, 0x2cb5bd0, 0x0, 0x0, 0x0)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/state.go:1980 +0x4fc
panic(0x4d81b8, 0x2280778)
	/usr/local/go/src/runtime/panic.go:965 +0x174
github.com/Windblade-GR01/glfont.LoadFont(0x2ca4c60, 0x23, 0x1b, 0x140, 0xf0, 0x0, 0x0, 0x0)
	/root/go/pkg/mod/github.com/!windblade-!g!r01/glfont@v0.0.0-20200825224555-fc4d8149c6a0/font.go:48 +0x2f4
main.loadFntTtf(0x2a38c30, 0x2261f98, 0x12, 0x2a504c2, 0x1e, 0x1b)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/font.go:340 +0x120
main.loadDefInfo(0x2a38c30, 0x2261f98, 0x12, 0x2cb5728, 0xffffffff)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/font.go:314 +0x370
main.loadFntV2(0x2261f98, 0x12, 0xffffffff, 0x0, 0x24b2480, 0xcaa4c)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/font.go:275 +0x25c
main.loadFnt(0x24c9f90, 0xd, 0xffffffff, 0xd, 0x8, 0x4d3110)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/font.go:49 +0x70
main.systemScriptInit.func53(0x1e16000, 0x2)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/script.go:766 +0x6c
github.com/yuin/gopher-lua.callGFunction(0x1e16000, 0x0, 0x1e69460)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/vm.go:202 +0x30
github.com/yuin/gopher-lua.init.3.func26(0x1e16000, 0x7c100403, 0x1e18050, 0x0)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/vm.go:817 +0x330
github.com/yuin/gopher-lua.mainLoop(0x1e16000, 0x1e18050)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/vm.go:31 +0xdc
github.com/yuin/gopher-lua.(*LState).callR(0x1e16000, 0x1, 0x1, 0x17)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/state.go:1203 +0x1b8
github.com/yuin/gopher-lua.(*LState).Call(...)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/state.go:1959
github.com/yuin/gopher-lua.loRequire(0x1e16000, 0x2a)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/baselib.go:559 +0x46c
github.com/yuin/gopher-lua.callGFunction(0x1e16000, 0x0, 0x1e13d20)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/vm.go:202 +0x30
github.com/yuin/gopher-lua.init.3.func26(0x1e16000, 0x7c500402, 0x1e18000, 0x0)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/vm.go:817 +0x330
github.com/yuin/gopher-lua.mainLoop(0x1e16000, 0x1e18000)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/vm.go:31 +0xdc
github.com/yuin/gopher-lua.(*LState).callR(0x1e16000, 0x0, 0xffffffff, 0x0)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/state.go:1203 +0x1b8
github.com/yuin/gopher-lua.(*LState).Call(...)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/state.go:1959
github.com/yuin/gopher-lua.(*LState).PCall(0x1e16000, 0x0, 0xffffffff, 0x0, 0x5ced50, 0x311e0a0)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/state.go:2022 +0xec
github.com/yuin/gopher-lua.(*LState).DoFile(0x1e16000, 0x1cb65b8, 0x18, 0x1e16000, 0xf)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/auxlib.go:396 +0x94
main.main()
	/home/pi/Desktop/Stuff/Ikemen-GO/src/main.go:87 +0x150

stack traceback:
	[G]: in function 'fontNew'
	external/script/main.lua:400: in function <external/script/main.lua:375>
	(tailcall): ?
	./external/script/menu.lua:374: in function <./external/script/menu.lua:0>
	[G]: in function 'require'
	external/script/main.lua:2123: in main chunk
	[G]: ?

While that last bit does mention LUA, the error at the very top of the log got me intrigued, so I searched for it on the IKEMEN-GO issues repository, which lead me to discover this issue, and a surprisingly detailed explanation and workaround posted by EVILEDLIBRE (great username by the way!), so I decided to give that workaround a try, and...

Windblade-GR01-IKEMEN GO on Pi 4.jpg

It got to the main menu, holy $#!&.

Interestingly, the issues that were present in LucasFebaits's fork are all here: the crashing on 32-bit Raspbian, the palette corruption, and even a brand new bug where inputs are seemingly triggering eachother (so for example, pressing down would also trigger a button press, making it impossible to navigate the menu).

But even in this largely nonfunctional, highly broken state, this is a GIGANTIC break from the constant no-hoper crash logs I kept running into, and definetly motivates me to keep pursuing this.

Addendum

Here's a quick summary of what does and does not work on Windblade's fork on a 32-bit-OS Pi 4, now that I've gotten it to compile:

Screenpack audio appears to be working just fine, surprisingly
On my wireless USB keyboard, inputs were registering eachother for some reason; on my Rock Candy X360 pad, this overlap did not occur but IKEMEN refused to read most of the buttons (the D-pad buttons were rotated 90 degrees and Left didn't work at all, but A and B seemed to work perfectly fine; it's worth noting that IKEMEN's input system experiences strange behavior even on Windows and a rewrite of that has been planned for a while)
Trying to start a fight crashes with the following log:

unexpected fault address 0x0
fatal error: fault
[signal SIGBUS: bus error code=0x1 addr=0x0 pc=0x2ae630]

goroutine 1 [running, locked to thread]:
runtime.throw(0x5243e6, 0x5)
	/usr/local/go/src/runtime/panic.go:1117 +0x5c fp=0x2adb430 sp=0x2adb41c pc=0x84d48
runtime.sigpanic()
	/usr/local/go/src/runtime/signal_unix.go:731 +0x210 fp=0x2adb448 sp=0x2adb430 pc=0x9bfc8
main.(*BytecodeStack).PushF(...)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/bytecode.go:566
main.BytecodeExp.run(0x39ab3a8, 0x5, 0x38, 0x35e2000, 0x1c, 0xa, 0x35e2000)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/bytecode.go:965 +0x7dc fp=0x2adb6b8 sp=0x2adb44c pc=0x2ae630
main.BytecodeExp.evalF(...)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/bytecode.go:1858
main.mapSet.Run.func1(0x4d5201, 0x281e000, 0x1, 0x1, 0x3cc2201)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/bytecode.go:6709 +0xd4 fp=0x2adb6e8 sp=0x2adb6b8 pc=0x3bf45c
main.StateControllerBase.run(0x39ab380, 0x35, 0x60, 0x35e2000, 0x2adb738)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/bytecode.go:2064 +0x11c fp=0x2adb70c sp=0x2adb6e8 pc=0x2c6c80
main.mapSet.Run(0x39ab380, 0x35, 0x60, 0x35e2000, 0x0, 0x0, 0x0, 0x3ff00000)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/bytecode.go:6704 +0x9c fp=0x2adb750 sp=0x2adb70c pc=0x2d0d88
main.(*mapSet).Run(0x295e6c0, 0x35e2000, 0x0, 0x0, 0x0, 0x7ec1e0)
	<autogenerated>:1 +0x64 fp=0x2adb774 sp=0x2adb750 pc=0x424608
main.StateBlock.Run(0x1, 0xffffffff, 0xfffffffe, 0x0, 0x3848c10, 0x4, 0x8, 0x3c608d0, 0x30fd300, 0x9, ...)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/bytecode.go:1978 +0x188 fp=0x2adb7f0 sp=0x2adb774 pc=0x2c6468
main.StateBlock.Run(0x1, 0xffffffff, 0xffffffff, 0x0, 0x3848600, 0x6, 0x8, 0x3c608a0, 0x283d320, 0x1, ...)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/bytecode.go:1966 +0x23c fp=0x2adb86c sp=0x2adb7f0 pc=0x2c651c
main.StateBlock.Run(0x1, 0xffffffff, 0xffffffff, 0x0, 0x3848560, 0xe, 0x10, 0x3c60780, 0x0, 0x0, ...)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/bytecode.go:1966 +0x23c fp=0x2adb8e8 sp=0x2adb86c pc=0x2c651c
main.(*StateBlock).Run(0x3c611d0, 0x35e2000, 0x0, 0x0, 0x0, 0x8ae70500)
	<autogenerated>:1 +0x60 fp=0x2adb958 sp=0x2adb8e8 pc=0x41f1a4
main.StateBlock.Run(0x1, 0xffffffff, 0xffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x37a7d00, 0x7, ...)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/bytecode.go:1978 +0x188 fp=0x2adb9d4 sp=0x2adb958 pc=0x2c6468
main.(*StateBytecode).run(0x2fc6000, 0x35e2000, 0xfffffffc)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/bytecode.go:7299 +0xac fp=0x2adba68 sp=0x2adb9d4 pc=0x2d1c64
main.(*Char).action(0x35e2000)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/char.go:5157 +0xe44 fp=0x2adbbd8 sp=0x2adba68 pc=0x2f2890
main.(*CharList).action(0x7b70b8, 0x0, 0x2adbc58, 0x2adbc5c, 0x2adbc54, 0x2adbc40, 0x2adf90c, 0x2adf910)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/char.go:5695 +0x80 fp=0x2adbc00 sp=0x2adbbd8 pc=0x2f6570
main.(*System).action(0x7af798, 0x2adf970, 0x2adf96c, 0x3f800000, 0x0, 0x0, 0x0)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/system.go:1196 +0x410 fp=0x2adf8f8 sp=0x2adbc00 pc=0x398764
main.(*System).fight(0x7af798, 0x3374000)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/system.go:2148 +0x10b8 fp=0x2ae1114 sp=0x2adf8f8 pc=0x39ce94
main.systemScriptInit.func54.2(0xc, 0x54a490, 0x7af798)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/script.go:878 +0x46c fp=0x2ae1808 sp=0x2ae1114 pc=0x3f2470
main.systemScriptInit.func54(0x2112240, 0x0)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/script.go:921 +0x328 fp=0x2ae1a1c sp=0x2ae1808 pc=0x3f2d84
github.com/yuin/gopher-lua.callGFunction(0x2112240, 0x0, 0x2288700)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/vm.go:202 +0x30 fp=0x2ae1a4c sp=0x2ae1a1c pc=0x2772d8
github.com/yuin/gopher-lua.init.3.func26(0x2112240, 0x7c080601, 0x2252000, 0x0)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/vm.go:817 +0x330 fp=0x2ae1af8 sp=0x2ae1a4c pc=0x27cc3c
github.com/yuin/gopher-lua.mainLoop(0x2112240, 0x2252000)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/vm.go:31 +0xdc fp=0x2ae1b0c sp=0x2ae1af8 pc=0x276e58
github.com/yuin/gopher-lua.(*LState).callR(0x2112240, 0x0, 0xffffffff, 0x0)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/state.go:1203 +0x1b8 fp=0x2ae1b80 sp=0x2ae1b0c pc=0x269164
github.com/yuin/gopher-lua.(*LState).Call(...)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/state.go:1959
github.com/yuin/gopher-lua.(*LState).PCall(0x2112240, 0x0, 0xffffffff, 0x0, 0x0, 0x0)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/state.go:2022 +0xec fp=0x2ae1bbc sp=0x2ae1b80 pc=0x26cbc4
github.com/yuin/gopher-lua.(*LState).DoFile(0x2112240, 0x2014720, 0x18, 0x2112240, 0xf)
	/root/go/pkg/mod/github.com/yuin/gopher-lua@v0.0.0-20200816102855-ee81675732da/auxlib.go:396 +0x94 fp=0x2ae1bd8 sp=0x2ae1bbc pc=0x23f834
main.main()
	/home/pi/Desktop/Stuff/Ikemen-GO/src/main.go:87 +0x150 fp=0x2ae1fb8 sp=0x2ae1bd8 pc=0x377314
runtime.main()
	/usr/local/go/src/runtime/proc.go:225 +0x26c fp=0x2ae1fe4 sp=0x2ae1fb8 pc=0x8766c
runtime.goexit()
	/usr/local/go/src/runtime/asm_arm.s:841 +0x4 fp=0x2ae1fe4 sp=0x2ae1fe4 pc=0xb7cbc

goroutine 18 [sleep]:
time.Sleep(0x989680, 0x0)
	/usr/local/go/src/runtime/time.go:193 +0x100
main.(*System).soundWrite(0x7af798)
	/home/pi/Desktop/Stuff/Ikemen-GO/src/system.go:661 +0x354
created by main.(*System).audioOpen
	/home/pi/Desktop/Stuff/Ikemen-GO/src/system.go:649 +0xc4

goroutine 6 [runnable]:
github.com/hajimehoshi/oto._Cfunc_snd_pcm_writei(0x9c6f9b98, 0x2a98000, 0x5be, 0x5be)
	_cgo_gotypes.go:173 +0x34
github.com/hajimehoshi/oto.(*driver).TryWrite.func1(0x200d200, 0x209e000)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/driver_linux.go:143 +0xb4
github.com/hajimehoshi/oto.(*driver).TryWrite(0x200d200, 0x209e028, 0xd8, 0x7fd8, 0x0, 0x0, 0x0)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/driver_linux.go:143 +0x15c
github.com/hajimehoshi/oto.(*driverWriter).Write(0x207c300, 0x209e000, 0x100, 0x8000, 0x0, 0x0, 0x0)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/context.go:148 +0xe0
io.copyBuffer(0x5cecd8, 0x207c300, 0x5cecec, 0x205e5a0, 0x209e000, 0x8000, 0x8000, 0x0, 0x0, 0x0, ...)
	/usr/local/go/src/io/io.go:425 +0x1c0
io.Copy(...)
	/usr/local/go/src/io/io.go:382
github.com/hajimehoshi/oto.NewContext.func1(0x200e8e0)
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/context.go:85 +0x58
created by github.com/hajimehoshi/oto.NewContext
	/root/go/pkg/mod/github.com/hajimehoshi/oto@v0.5.4/context.go:84 +0x1e8

goroutine 7 [select]:
io.(*pipe).Write(0x2054340, 0x22400d8, 0x4410, 0x4410, 0xd8, 0x0, 0x0)
	/usr/local/go/src/io/pipe.go:94 +0x148
io.(*PipeWriter).Write(0x2161338, 0x2240000, 0x44e8, 0x44e8, 0x113a, 0x1, 0x0)
	/usr/local/go/src/io/pipe.go:163 +0x38
... (32 lines left)

The palette corruption described in the OP regarding LucasFebaits's fork is also in effect here
Fullscreen works, but does not revert to normal resolution on exit and crashes outright on composite-output mode

And the two major ingredients (it seems) to getting Windblade's IKEMEN GO to compile on the Pi 4 are:

Using Go 1.16.4 instead of apt-get install's 1.11. No idea how this would be accomplished using a RetroPie script module (as I've never seen a scenario where a dependency like go was obtained through anything other than apt-get install)
Forcing the executable to be ran with MESA_GL_VERSION_OVERRIDE=4.3, as IKEMEN GO was designed with GL 2.1 features, and the default version of GLES ran seems to cause compatiability issues with it; this could be accomplished very easily in a shellscript:

#!/bin/sh
MESA_GL_VERSION_OVERRIDE=4.3 ./Ikemen_GO_linux

MrRussellgro

This looks like some sweet progress. Hope it works well! I'm stoked to see how I.K.E.M.E.N looks like on RetroPie.

Troopaking

@superfromnd
Hello so I have been working on getting mugen to run on pi 4 . I have a had really good success using box86/wine and Lutris on TwisterOS .
Will be releasing a precompliled mugen image titled M.I.M.P (mimp is mugen pi) semi soon. Hopefully launching multiple mugens from emulationstation or pegasus frontend.
Glad to see others with similar ideas .
Good luck I have been trying since day one of owning a pi 4 . Just now made good progress.

MrRussellgro

@troopaking That's awesome! I am pleased to hear you got something going on as well.

SuperFromND

Haven't made any progress on this, but I'm posting because it turns out that a fellow on Reddit managed to get MUGEN running using Box86 and Wine, not unlike Troopaking's post above.

This isn't really helping IKEMEN GO's case at all, but I thought it was worth mentioning at least. :D

Troopaking

@superfromnd
Check this
https://retropie.org.uk/forum/topic/28528/box86-and-wine-on-rpi4/333

We've been working hard and have a how to add to any build in it . All old windows games ikemen would work loaded over 30 mugens and tested already

joamjoamjoam

@SuperFromND Hey I just found out about Mugen last week and I need more of it lol. I think Ikemen and Retropie are a perfect match and so I wanted to step in and help as much as I can. Ive been trying to port Ikemen to the pi over the past couple days and i ran across this gem of a thread and i wanted to add my progress and hopefully we can get this thing built into retropie at some point.

Anyways Using the LucasFebatis branch of Ikemen-Go-Plus I was able to compile and run a match using the Retropie prebuilt 32-bit image.

I was getting the infamous SIGBUS error which is because some of the OPCodes (mainly just OC_float) in bytecode.go:run() is trying to convert some bytes from the stack into an address but this address is not valid hence the SIGBUS. To get around this i replaced the line:

sys.bcStack.PushF(*(*float32)(unsafe.Pointer(&be[i])))

with

sys.bcStack.PushF(0);

This fixed the sigbus error on match load and got me into matches. Where to my surprise i found no pallette bug. I wasn't able to find the pallette character you were using but i did try to fight with the one and only Ronald Mcdonald to produce the below screenshot.
No Pallette Error.png

The only bug i ran into now is that because the OC_Float opcode is used to convert float numbers in the boolean expressions that move characters from state to state in their .def file, by hard coding the address of 0 the characters get stuck in states that they cannot get out of. This leads to issues like KFM looks like he's falling forever and cant be hit since that state ignores hits. So if we can see why these addresses are coming up wrong when read in the OC_float case in bytecode.go:run() we should be able to actually play matches.

If you'd like me to send anything of what I have so far let me know ill keep monitoring this thread.

joamjoamjoam

Oh and some stats about what I'm using night help recreate my results:

GO version (default installed from apt-get)
go 1.11.6 linux/arm

Pi Model (from /proc/cpuinfo):
Raspberry Pi 4 Model B Rev 1.1

Retropie version 4.6:

my Run.sh

#!/bin/sh
export GOPATH=$PWD/go
export DISPLAY=192.168.0.106:2.0
echo Using Display $DISPLAY
go fmt ./src/.go
MESA_GL_VERSION_OVERRIDE=4.3 go run ./src/.go

joamjoamjoam

So a little more digging into the issue led me to the fact that there is a byte alignment issue with the bcStack.

The address of be[i] when processing the OC_float op code is misaligned sometimes meaning its not a multiple of 4 like a pointer address needs to be. Not sure yet if this is related to a go unsafe pointer quirk or if we need to fix the alignment in the struct definitions.

This would be the reason why the 64bit OS doesn't have this SigBus Issue. The good news is that if i ported the code i have over to raspbianx64 this should be fully functioning now. Ill have to verify this still but with these alignment quirks caused by the use of 64 bit types (especially float64) on a 32bit opearting system the sigbus should sort itself out.

SuperFromND

Woahhh, stellar work joam! This was a very pleasant thing to wake up to this morning :D

I can't really help out too much on this specifically since low-level instructions and byte-alignment stuff is far out of my realm of expertis, but if you do need me for anything else (testing stuff, etc.) then let me know!

(oh, and the character I was using was the original Donald by Kishio, which can be found here; not that you'll really need it seeing as the palette issues apparently didn't occur for you at all.)

SuperFromND

I just forwarded these posts to the IKEMEN devs over on the Discord (which is probably a good idea for you join, by the way; it'll probably help being able to talk with the devs directly), and Gacel stated he's gonna look into adding these changes into the main IKEMEN GO fork (that's the Windblade-GR01 fork, not the LucasFebaits one you seem to be using).

Since I know how to compile and run that fork now, that would theoretically make it possible to compile directly from the main IKEMEN GO fork, meaning we'd always have the newest version of IKEMEN GO available for folks to compile!

If the changes are made and it turns out to work, I could probably (finally) start working on a scriptmodule for this. :D

joamjoamjoam

Glad i can help. I joined the discord and ill start getting acquainted with everyone this week. I think Gacel's could be invaluable in helping to align the structures. Luckily Alignment issues usually only affect ARM based systems (other compilers/arch are good at padding things for you) so in theory the padding should only affect these devices.

I gave it a go for like 6 hours last night trying to figure out what needed to be aligned but couldn't get a working build though my results mentioned below with the 64 bit Raspbian tell me that the structures are properly 8-Byte Aligned when using the 64 bit types. So that just means its really close already.

Thanks for the character ill load that one in just to make sure its not that character causing issues and i just got lucky with my character choice.

Also i started with the LucasFebatis repo cause you seemed to be having better results with it but i see that its a little over 1000 commits behind so before we start to byte align things for the 32 bit OS ill migrate up to that version.

Good News! I was waiting on an SD Card to load the 64 bit OS which arrived today and i was able to verify that on the 64bit Beta Raspbian I was able to play the game without any crashes. As far as i can see everything works. Also the performance was pretty good.

Unfortunately I did notice however that when using the X server on the Pi itself i saw the pallette issue but using the external xserver on my PC everything drew up just fine. this makes me think that the Xserver is to blame here. Though it is possible that the rendering is done on the PC side and replaces whatever bugs may on the pi side.

I think the byte alignment issue is a technicality so it shoouldnt be a showstopper on getting Ikemen on the Pi, it will just take some to sort out.

The pallette bug on the other hand seems like it demands attention so i think ill continue my testing on the 64 bit Raspbian and try to see if i can figure that one out but I think ole Lucas was onto what i saw also. He mentions that the XServer may have issues processing gamma ramp so i may start with finding an alternative XServer.

"For Got b'X11: RandR gamma ramp support seems broken"

TLDR

Current State: (Lucas Febatis)
32 bit Retropie OS:
Menus work good
Crashes in Match due to an Alignment Trap processing OC_float in bytecode.go (be[i] is not 2, 4, or 8 byte aligned)
When using an External X Server on PC palletes show correctly
Using Pi as the XServer the palette bug exists.

64 bit Raspbian OS:
Everything works except for the palette bug when using pi as the XServer
When using an External X Server on PC palettes show correctly.

joamjoamjoam

@SuperFromND

More progress updates on the 32 bit crashing when entering matches. I found a workaround for the Alignment trap by reading the array myself reallocating a slice and then dumping the resulting float32 in the stack where it belongs.

With this simple "fix" I am able to match the 64 bit OS functionality (Lucas Febatis repo) where you can play through matches and everything works as it should. The palette issue still exists as the only bug i can find so that's next on the todo list.

Maybe we can make a "Infection" Ikemen game so the palette issues become a feature lol.

Anyways ill port the "fix" in to the official windblade branch and test it there but since it was the same sigbus you were receiving this should fix that issue.

Fix for sigbus Alignment error on arm32

replace the line below from src/bytecode.go(line 898 ish or line 968 in WIndblade Repo) in Run() for OC_float case

sys.bcStack.PushF(*(*float32)(unsafe.Pointer(&be[i])))

to

arr := make([]byte, 4)
arr[0] = byte(be[i])
arr[1] = byte(be[i+1])
arr[2] = byte(be[i+2])
arr[3] = byte(be[i+3])
flo := Float32frombytes(arr)
sys.bcStack.PushF(flo)

Im off to compile the main fork be back later ...

Aaaand I'm back. Thank to your great tutorial i was able to compile the windblade for (which has a lot more stuff in btw) and confirmed that with the above "fix" I was able to get complete a few matches on the Retropie distro and had no crashes anywhere.

Note: The windblade branch was missing a function and an import for "encoding/binary":

func Float32frombytes(bytes []byte) float32 {
bits := binary.LittleEndian.Uint32(bytes)
return math.Float32frombits(bits)
}

Added a pull request for the windblade repo for this workaround. Ill leave the above explanation for history.
https://github.com/Windblade-GR01/Ikemen-GO/pull/319

SuperFromND

Great news, the PR above that joamjoamjoam submitted just got merged, and I can confirm it DOES compile! As you can see by this gameplay footage I recorded the palette issues still persist on Pi (According to joam's posts above, there's something in the Pi's Xserver that breaks it for whatever reason), but aside from that it's basically fully functional.

Fun side note: that weird input bug I mentioned earlier? Turns out that was just a fluke; my Bluetooth keyboard just doesn't play well with IKEMEN for whatever reason, and plugging in my usual USB keyboard worked perfectly fine (though my X360 pad still had a rotated D-pad by default, this can be easily fixed by just modifying config.json and all the other buttons work fine).

I guess it's time to start writing a scriptmodule then!

SuperFromND

Another update from me, I have managed to create an almost fully-functioning RetroPie scriptmodule for IKEMEN GO! Keyword there being almost, because while it can indeed download, compile and install IKEMEN GO, and while said build can be started, it hangs when trying to load.

There's a really odd quirk, though I'm not sure if it's the fault of IKEMEN or a consequence of xinit, but for whatever reason the engine fails to find LUA script files (that it needs) if you try to run it from anywhere other than the directory Ikemen_GO itself is installed in. So for example, if you ran IKEMEN GO from /foo/bar/ but it needs a file from/the/monkey/paw.png, it'll try to find the file at /foo/bar/paw.png! Thankfully this can be fixed with a very simple shellscript to manually change the directory to IKEMEN GO's and run that through XINIT: like so:

#!/bin/bash
cd /opt/retropie/ports/ikemen-go
MESA_GL_VERSION_OVERRIDE=4.3 ./Ikemen_GO

There's also something rather strange I encountered: when running IKEMEN GO from runcommand (making use of XINIT:, which is used in a few other scriptmodules like uqm and ags), it hangs on a black screen (assuming that the LUA issue mentioned above is solved already). It's not just refusing to run, as it will crash out if you have certain controllers plugged in when starting the engine up, but once it has started it just hangs indefinitely, leaving you with a black screen.

It's not just displaying to the wrong screen either; even grabbing a keyboard and spamming the Esc key to try and quit IKEMEN GO doesn't do anything, it's just flat-out frozen. There's actually been at least one other project that has gotten this black screen issue through XINIT:, though sadly the thread never elaborated on it nor provided a solution.

However, manually starting xinit and then running it... works perfectly fine! This seems to suggest that I might just need to tweak the launch command more, so perhaps someone more savvy and experienced with XINIT: related stuff in RetroPie could come and assist (paging @mitu perhaps?)

I should mention that there's a second way of running stuff that requires xinit in RetroPie, and that's using xinit -e 'command'. Unfortunately, trying that instead crashes due to xinit not having permission to access /dev/tty0, crashing before we even get a chance for IKEMEN GO to run. Now, there is a fix for this, and I confirmed that it DOES allow IKEMEN GO to run from runcommand.

The only problem is that the fix is this:

# a very, VERY bad idea, especially for a game with user-made content
ikemen-go = "sudo xinit -e '/opt/retropie/ports/ikemen-go/ikemen-go.sh'"
default = "ikemen-go"

For those not super savvy with how Linux works, sudo is essentially the Linux equivalent of running a program as an administrator in Windows, and is really only supposed to be used as a last resort, and not for general use like this.

I actually ran into this exact same conundrum back in 2018 while trying to get Flash and Java games running on RetroPie, and I did technically find a solution that didn't require sudo xinit. That solution was using a chmod command on Xorg to allow it to run from a script:

sudo chmod ug+s /usr/lib/xorg/Xorg

Of course, since as you can see this also makes use of the sudo command, it's not a safe or elegant solution to this problem either.

So to recap:

Running IKEMEN GO manually works fine
Running IKEMEN GO from XINIT: hangs at a black screen
Running IKEMEN GO from xinit -e isnt possible without a huge security risk

Thankfully, aside from the palette issues joam described above, and the controller bug mentioned earlier in this thread that's planned to be remedied soon anyways, this is the last major issue that needs to be fixed before IKEMEN GO could be feasibly added to RetroPie. And given the circumstances and the fact that running source ports through XINIT: is clearly possible already, this could very well be ready for testing soon. We're in the endgame.