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libretro/emulators/jl-mod.yml
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Abdessamad Derraz 7ecd8c948f chore: record the sha1 of bundled files 
336 entries for files that arrive with the emulator named no hash, so
the collected copy was the only record of which file the release
ships. Each now carries the sha1 and size of the copy collected from
that emulator's own release, so the profile keeps the file's identity
once the copy leaves the collection. Entries whose name is a pattern
keep no hash.
2026-10-20 09:29:18 +02:00

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emulator: JL-Mod
type: standalone
core_classification: community_fork
source: "https://github.com/woesss/JL-Mod"
upstream: "https://github.com/nikita36078/J2ME-Loader"
author: "Yury Kharchenko"
profiled_date: "2026-08-11"
source_commit: "f723a190c0bdb44b31c3bc0ead6f8665c7ea517d"
core_version: "0.87.1"
display_name: "Mobile - J2ME (JL-Mod)"
cores:
- jl-mod
- "JL-MOD"
systems:
- j2me
mode: standalone
notes: |
MIDP/CLDC runtime for Android, package ru.woesss.j2meloader. A .jar, .jad or
.kjx is instrumented and converted to Dalvik bytecode at install time, then
runs against the javax.microedition classes compiled into the app, so no
device firmware is read. Two build flavors share the sources: emulator, the
published application, and midlet, which packs a single ported J2ME
application and is the only one reading MIDLET-META-INF/MANIFEST.MF.
ref: app/src/main/java/ru/woesss/j2me/installer/AppInstaller.java:127-146,
app/build.gradle.kts:67-93,
app/src/main/java/javax/microedition/shell/MicroLoader.java:127-146
Three 3D stacks are compiled in, each with its own shaders and native code:
JSR-184 M3G on GLES 1.1 (libjavam3g.so), Mascot Capsule v3 (libmicro3d.so with
the tex, color, simple and sprite programs) and Nokia M3D (libgles_utils.so
with the m3d pair). MIDI playback goes to the Android synthesizer unless a
sound bank is selected, which routes it to Sonivox EAS or TinySoundFont, both
driven by Oboe.
ref: app/src/main/cpp/Android.mk:1,
app/src/main/java/ru/woesss/j2me/mmapi/synth/SynthPluginFactory.java:34-52
Assets are read through ContextHolder.getAssetAsString, which rethrows an
IOException as RuntimeException instead of degrading, so an absent asset ends
the code path that reads it.
ref: app/src/main/java/javax/microedition/util/ContextHolder.java:178-192
The working directory holds converted/, configs/, templates/ and data/, all
written by the app, plus shaders/, soundbanks/ and skins/, created empty at
first run and read from. data/ carries the RMS record stores and backs the
JSR-75 c: drive.
ref: app/src/main/java/ru/playsoftware/j2meloader/config/Config.java:41-58,
app/src/main/java/ru/playsoftware/j2meloader/util/FileUtils.java:162-171,
app/src/main/java/javax/microedition/shell/MicroLoader.java:221-227
files:
- name: system.props
size: 827
sha1: 4b371578278811a84fd717cb726c58e3e258baaf
system: j2me
required: true
bundled: true
category: game_data
description: "Default microedition system properties"
note: "Read from assets/defaults when a profile is created, when the config screen has no stored value and when updateSystemProperties fills the field. Each line becomes a System.setProperty and MidletSystem.setProperty pair at MIDlet startup, carrying microedition.configuration, microedition.platform, the JSR version strings and the vendor identity values."
source_ref: "source app/src/main/java/ru/playsoftware/j2meloader/config/ProfileModel.java:211, source app/src/main/java/ru/playsoftware/j2meloader/config/ConfigActivity.java:644, source app/src/main/java/ru/playsoftware/j2meloader/config/ProfilesManager.java:189, source app/src/main/java/javax/microedition/shell/MicroLoader.java:246-252"
- name: simple.vsh
system: j2me
required: true
bundled: true
category: game_data
description: "Vertex shader for the screen blitter"
note: "Compiled when the GL surface is created and no user shader is selected. Graphics mode 1 is the default, so this is the standard display path. Also compiled as the Simple program of the Mascot Capsule renderer."
source_ref: "source app/src/main/java/javax/microedition/lcdui/graphics/ShaderProgram.java:34, source app/src/main/java/javax/microedition/lcdui/graphics/ShaderProgram.java:58, source app/src/main/java/javax/microedition/lcdui/Canvas.java:744, source app/src/main/java/ru/playsoftware/j2meloader/config/ProfileModel.java:193, source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:216"
- name: simple.fsh
system: j2me
required: true
bundled: true
category: game_data
description: "Fragment shader for the screen blitter"
note: "Paired with simple.vsh. createProgram returning -1 raises RuntimeException at surface creation."
source_ref: "source app/src/main/java/javax/microedition/lcdui/graphics/ShaderProgram.java:35, source app/src/main/java/javax/microedition/lcdui/graphics/ShaderProgram.java:59-63, source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:217"
- name: color.vsh
system: j2me
required: true
bundled: true
category: game_data
description: "Vertex shader for untextured Mascot Capsule geometry"
note: "Program.create builds the tex, color, simple and sprite programs together the first time the Mascot Capsule renderer draws, so all four pairs are read on the first micro3d frame."
source_ref: "source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:150, source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:53-58, source app/src/main/java/ru/woesss/j2me/micro3d/Render.java:156"
- name: color.fsh
system: j2me
required: true
bundled: true
category: game_data
description: "Fragment shader for untextured Mascot Capsule geometry"
note: "Carries the sphere map, toon threshold and primitive colour uniforms of the Color program."
source_ref: "source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:151, source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:162-178"
- name: tex.vsh
system: j2me
required: true
bundled: true
category: game_data
description: "Vertex shader for textured Mascot Capsule geometry"
note: "Built by Program.create alongside the other three pairs."
source_ref: "source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:233, source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:53-58"
- name: tex.fsh
system: j2me
required: true
bundled: true
category: game_data
description: "Fragment shader for textured Mascot Capsule geometry"
note: "Carries the texture size, sphere map and toon uniforms of the Tex program."
source_ref: "source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:234, source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:253-271"
- name: sprite.vsh
system: j2me
required: true
bundled: true
category: game_data
description: "Vertex shader for Mascot Capsule sprites"
note: "Built by Program.create alongside the other three pairs."
source_ref: "source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:313, source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:53-58"
- name: sprite.fsh
system: j2me
required: true
bundled: true
category: game_data
description: "Fragment shader for Mascot Capsule sprites"
note: "Carries the texture size and colour key uniforms of the Sprite program."
source_ref: "source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:314, source app/src/main/java/ru/woesss/j2me/micro3d/Program.java:330-337"
- name: m3d.vsh
size: 193
sha1: 51d4ddc7cd594b20a9019abf9c23904b64819498
system: j2me
required: true
bundled: true
category: game_data
description: "Vertex shader for the Nokia M3D renderer"
note: "Compiled when a MIDlet first binds a com.nokia.mid.m3d context. Carries the position, texture coordinate and matrix inputs."
source_ref: "source app/src/main/java/com/nokia/mid/m3d/ShaderProgram.java:28, source app/src/main/java/com/nokia/mid/m3d/ShaderProgram.java:38, source app/src/main/java/com/nokia/mid/m3d/M3D.java:132"
- name: m3d.fsh
size: 206
sha1: fd91f8c1337962197f5058dc9fbea5da2bac5ae6
system: j2me
required: true
bundled: true
category: game_data
description: "Fragment shader for the Nokia M3D renderer"
note: "Paired with m3d.vsh. A link failure raises RuntimeException in the constructor."
source_ref: "source app/src/main/java/com/nokia/mid/m3d/ShaderProgram.java:29, source app/src/main/java/com/nokia/mid/m3d/ShaderProgram.java:39-76"
- name: patches.bin
size: 363
sha1: 3bdf93cd0ea795e98f4195c5898d3ab0f9b918cf
system: j2me
required: true
bundled: true
category: game_data
description: "Binary class patches applied during MIDlet conversion"
note: "Index of class CRC32 to patch offset, read by the static field initializer of AndroidProducer and again for each matching class the dexer instruments. A read failure outside end of file is rethrown as RuntimeException, which breaks class initialization and therefore every conversion. Patch entries are applied by the SRC/EXT/FWD/BWD opcode stream of BinaryPatcher."
source_ref: "source dexlib/src/main/java/org/microemu/android/asm/AndroidProducer.java:41, source dexlib/src/main/java/org/microemu/android/asm/AndroidProducer.java:62-90, source dexlib/src/main/java/com/android/dx/command/dexer/Main.java:468, source dexlib/src/main/java/org/microemu/android/asm/BinaryPatcher.java:49-71"
- name: licenses.html
size: 2621
sha1: 87db7f2faca0bbc79c8b4acbca878eef521bfce9
system: j2me
required: false
bundled: true
category: game_data
description: "Third party licence text of the about screen"
note: "Read when the licences dialog is opened and shown as HTML. Emulation never touches it."
source_ref: "upstream app/src/main/java/ru/playsoftware/j2meloader/info/LicensesDialogFragment.java:35"
- name: appcenter.cer
system: j2me
required: false
bundled: true
category: game_data
description: "X.509 certificate for the crash report endpoint"
note: "Named as an ACRA certificate path only when the crash sender is configured on Android 4.1 through 4.4, where TLSv1.2 is forced. Every other release uses the default socket factory."
source_ref: "source app/src/main/java/ru/playsoftware/j2meloader/crashes/AppCenterSender.java:68-75"
- name: libc++_shared.so
size: 1039112
sha1: f2e861b1229d5d520ce2fc0dc70deb11eeb7cfe2
system: j2me
required: true
bundled: true
category: game_data
description: "NDK C++ runtime for the native modules"
note: "Named ahead of every other native library, in the static initializers of GLESUtils and micro3d Utils, in the M3G toolkit init and in both synthesizer classes."
source_ref: "source app/src/main/java/ru/woesss/gles/GLESUtils.java:31, source app/src/main/java/ru/woesss/j2me/micro3d/Utils.java:103, source app/src/main/java/javax/microedition/m3g/Platform.java:86, source app/src/main/java/ru/woesss/j2me/mmapi/synth/eas/LibEAS.java:70, source app/src/main/java/ru/woesss/j2me/mmapi/synth/tsf/LibTSF.java:70"
- name: libgles_utils.so
size: 8600
sha1: b5e287339fbdfbb44751abb76dfbf485419c06f4
system: j2me
required: true
bundled: true
category: game_data
description: "GLES blit routines for the Nokia M3D and Mexa OpenGL surfaces"
note: "Loaded from the static initializer of GLESUtils, so the first blit brings it in. Holds the GLES1 and GLES2 bitmap blits."
source_ref: "source app/src/main/java/ru/woesss/gles/GLESUtils.java:30-33, source app/src/main/java/com/nokia/mid/m3d/M3D.java:323, source app/src/main/java/com/mexa/opgl/OpglGraphics.java:493, source app/src/main/cpp/gles_utils/Android.mk:5-11"
- name: libjavam3g.so
size: 427240
sha1: 440745ef16d14f15cb2047956d217526a51440f2
system: j2me
required: true
bundled: true
category: game_data
description: "JSR-184 M3G engine"
note: "Named by System.loadLibrary outside any catch, the first time the toolkit reports the UI thread available. Built by ndkBuild from the m3g sources against GLES 1.1."
source_ref: "source app/src/main/java/javax/microedition/m3g/Platform.java:85-89, source app/src/main/java/javax/microedition/m3g/Interface.java:314, source app/src/main/cpp/m3g/Android.mk:5-15"
- name: libmicro3d.so
size: 8808
sha1: cd68cd2124ca9d7921be018d1e55d4db830e10d9
system: j2me
required: true
bundled: true
category: game_data
description: "Mascot Capsule vertex and buffer routines"
note: "Loaded from the static initializer of Utils, so the first Mascot Capsule call brings it in. Holds fillBuffer, glReadPixels and the bone transform."
source_ref: "source app/src/main/java/ru/woesss/j2me/micro3d/Utils.java:97-105, source app/src/main/cpp/micro3d/Android.mk:5-10"
- name: liboboe.so
size: 278376
sha1: 6d58884ad4a8cf37087ee2e24e6c12383325090a
system: j2me
required: false
bundled: true
category: game_data
description: "Audio output stream of the sound bank synthesizers"
note: "Named by both synthesizer classes ahead of their own libraries. Reached only when a sound bank is selected, and SynthPluginFactory catches the load failure and falls back to the Android synthesizer."
source_ref: "source app/src/main/java/ru/woesss/j2me/mmapi/synth/eas/LibEAS.java:71, source app/src/main/java/ru/woesss/j2me/mmapi/synth/tsf/LibTSF.java:71, source app/src/main/java/ru/woesss/j2me/mmapi/synth/SynthPluginFactory.java:40-53"
- name: libmmapi_common.so
size: 16488
sha1: 63624552130454ee4ca0c7c7aadb7b5b6bc0ebca
system: j2me
required: false
bundled: true
category: game_data
description: "Shared player and listener code of the synthesizer plugins"
note: "Named by both synthesizer classes ahead of their own libraries. Same fallback as liboboe.so."
source_ref: "source app/src/main/java/ru/woesss/j2me/mmapi/synth/eas/LibEAS.java:72, source app/src/main/java/ru/woesss/j2me/mmapi/synth/tsf/LibTSF.java:72, source app/src/main/cpp/mmapi_common/Android.mk:5-12"
- name: libmmapi_eas.so
size: 611768
sha1: 52ca5b835fdc54ea0bcb5b214ad45a246c01f101
system: j2me
required: false
bundled: true
category: game_data
description: "Sonivox EAS synthesizer"
note: "Loaded from the static initializer of LibEAS when a sound bank is selected. Links the sonivox wavetable engine statically and reads the bank as a DLS collection. A failure leaves the TinySoundFont plugin or the Android synthesizer."
source_ref: "source app/src/main/java/ru/woesss/j2me/mmapi/synth/eas/LibEAS.java:69-74, source app/src/main/cpp/mmapi_eas/Android.mk:5-22, source app/src/main/cpp/sonivox/Android.mk:134"
- name: libmmapi_tsf.so
size: 61392
sha1: 9e675c073cc065cd89359410717a94ffaf8515cb
system: j2me
required: false
bundled: true
category: game_data
description: "TinySoundFont synthesizer"
note: "Loaded from the static initializer of LibTSF when a sound bank is selected. Reads the bank as a SoundFont and plays standard MIDI files. A failure leaves the EAS plugin or the Android synthesizer."
source_ref: "source app/src/main/java/ru/woesss/j2me/mmapi/synth/tsf/LibTSF.java:69-74, source app/src/main/cpp/mmapi_tsf/Android.mk:5-11"
- name: "<soundbank>.dls"
path: "soundbanks/<soundbank>.dls"
system: j2me
required: false
unsourceable: "user supplied, no canonical file"
category: game_data
description: "DLS sound bank for MIDI playback"
note: "The config screen lists every regular file in the sound banks directory with no extension filter, and the selected name is kept as a path when the file exists. EAS_LoadDLSCollection reads it with the header search flag off. A rejected file throws and the plugin is skipped."
source_ref: "source app/src/main/java/ru/playsoftware/j2meloader/config/ConfigActivity.java:318-337, source app/src/main/java/javax/microedition/shell/MicroLoader.java:272-274, source app/src/main/cpp/mmapi_eas/eas_player.cpp:112-126"
- name: "<soundbank>.sf2"
path: "soundbanks/<soundbank>.sf2"
system: j2me
required: false
unsourceable: "user supplied, no canonical file"
category: game_data
description: "SoundFont sound bank for MIDI playback"
note: "Same selection path as the DLS bank. tsf_load_filename parses it, and a null result throws IllegalArgumentException so the plugin is skipped. Only standard MIDI files are played through this synthesizer."
source_ref: "source app/src/main/java/ru/playsoftware/j2meloader/config/ConfigActivity.java:318-337, source app/src/main/cpp/mmapi_tsf/tsf_player.cpp:87-94, source app/src/main/cpp/mmapi_tsf/tsf_player_jni.cpp:15-27"
- name: "<skin>"
path: "skins/<skin>"
system: j2me
required: false
unsourceable: "user supplied, no canonical file"
category: game_data
description: "Background image drawn behind the virtual screen"
note: "Any image format Android can decode. Decoded twice, once for bounds and once downsampled to the display, and an undecodable file leaves the layer unset. A rectangular area filled with transparent black is taken as the screen placement."
source_ref: "source app/src/main/java/ru/playsoftware/j2meloader/config/ConfigActivity.java:297-316, source app/src/main/java/javax/microedition/lcdui/skin/SkinLayer.java:81-111, source app/src/main/java/javax/microedition/shell/MicroLoader.java:276-278"
- name: "<shader>.ini"
path: "shaders/<shader>.ini"
system: j2me
required: false
unsourceable: "user supplied, no canonical file"
category: game_data
description: "Shader descriptor read from the emulator directory"
note: "The config screen creates the shaders directory, keeps every file ending in .ini and parses it as sections opened by a bracketed name, retaining the entries that name both a Vertex and a Fragment file. Name, Author, OutputResolution, Upscaling and four SettingName/SettingDefaultValue/SettingMinValue/SettingStep groups are also read, which is the PPSSPP post-processing descriptor format."
source_ref: "source app/src/main/java/ru/playsoftware/j2meloader/config/ConfigActivity.java:403-464, source app/src/main/java/ru/playsoftware/j2meloader/config/ShaderInfo.java:101-207"
- name: "<shader>.vsh"
path: "shaders/<shader>.vsh"
system: j2me
required: false
unsourceable: "user supplied, no canonical file"
category: game_data
description: "Vertex shader named by a descriptor"
note: "Read whole from the shaders directory when the selected filter names it, then compiled in place of the built-in blitter. An unreadable file yields an empty string, the program fails to build and the bundled default is used after a toast."
source_ref: "source app/src/main/java/javax/microedition/lcdui/graphics/ShaderProgram.java:44-56, source app/src/main/java/javax/microedition/shell/MicroLoader.java:263-266, source app/src/main/java/ru/playsoftware/j2meloader/util/FileUtils.java:152-160"
- name: "<shader>.fsh"
path: "shaders/<shader>.fsh"
system: j2me
required: false
unsourceable: "user supplied, no canonical file"
category: game_data
description: "Fragment shader named by a descriptor"
note: "Paired with the vertex file of the same descriptor. Four float uniforms from the descriptor settings are pushed to it at surface creation."
source_ref: "source app/src/main/java/javax/microedition/lcdui/graphics/ShaderProgram.java:44-56, source app/src/main/java/javax/microedition/lcdui/Canvas.java:753-754"
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