commit 2293dc29fb2b55c8bd17b0aa316f07e861276132
Author: eldek <es.delfante@gmail.com>
Date:   Sun Apr 5 17:17:46 2026 -0300

    Initial commit

diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..67df35c
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,18 @@
+# https://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{java,scala,groovy,kt,kts}]
+indent_size = 4
+
+[*.gradle]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..6c84be0
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+* text=auto eol=lf
+*.bat text=auto eol=crlf
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bf713c6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,164 @@
+## Gradle:
+.gradle/
+gradle-app.setting
+/build/
+/android/build/
+/core/build/
+/lwjgl2/build/
+/lwjgl3/build/
+/html/build/
+/teavm/build/
+/ios/build/
+/ios-moe/build/
+/headless/build/
+/server/build/
+/shared/build/
+
+## Java:
+*.class
+*.war
+*.ear
+hs_err_pid*
+.attach_pid*
+
+## Android:
+/android/libs/armeabi-v7a/
+/android/libs/arm64-v8a/
+/android/libs/x86/
+/android/libs/x86_64/
+/android/gen/
+/android/out/
+local.properties
+com_crashlytics_export_strings.xml
+
+## Robovm:
+/ios/robovm-build/
+
+## iOS:
+/ios/xcode/*.xcodeproj/*
+!/ios/xcode/*.xcodeproj/xcshareddata
+!/ios/xcode/*.xcodeproj/project.pbxproj
+/ios/xcode/native/
+/ios/IOSLauncher.app
+/ios/IOSLauncher.app.dSYM
+
+## GWT:
+/html/war/
+/html/gwt-unitCache/
+.apt_generated/
+/html/war/WEB-INF/deploy/
+/html/war/WEB-INF/classes/
+.gwt/
+gwt-unitCache/
+www-test/
+.gwt-tmp/
+
+## TeaVM:
+# Not sure yet...
+
+## IntelliJ, Android Studio:
+.idea/
+*.ipr
+*.iws
+*.iml
+
+## Eclipse:
+.classpath
+.project
+.metadata/
+/android/bin/
+/core/bin/
+/lwjgl2/bin/
+/lwjgl3/bin/
+/html/bin/
+/teavm/bin/
+/ios/bin/
+/ios-moe/bin/
+/headless/bin/
+/server/bin/
+/shared/bin/
+*.tmp
+*.bak
+*.swp
+*~.nib
+.settings/
+.loadpath
+.externalToolBuilders/
+*.launch
+
+
+## NetBeans:
+
+/nbproject/private/
+/android/nbproject/private/
+/core/nbproject/private/
+/lwjgl2/nbproject/private/
+/lwjgl3/nbproject/private/
+/html/nbproject/private/
+/teavm/nbproject/private/
+/ios/nbproject/private/
+/ios-moe/nbproject/private/
+/headless/nbproject/private/
+/server/nbproject/private/
+/shared/nbproject/private/
+
+/nbbuild/
+/android/nbbuild/
+/core/nbbuild/
+/lwjgl2/nbbuild/
+/lwjgl3/nbbuild/
+/html/nbbuild/
+/teavm/nbbuild/
+/ios/nbbuild/
+/ios-moe/nbbuild/
+/headless/nbbuild/
+/server/nbbuild/
+/shared/nbbuild/
+
+/dist/
+/android/dist/
+/core/dist/
+/lwjgl2/dist/
+/lwjgl3/dist/
+/html/dist/
+/teavm/dist/
+/ios/dist/
+/ios-moe/dist/
+/headless/dist/
+/server/dist/
+/shared/dist/
+
+/nbdist/
+/android/nbdist/
+/core/nbdist/
+/lwjgl2/nbdist/
+/lwjgl3/nbdist/
+/html/nbdist/
+/teavm/nbdist/
+/ios/nbdist/
+/ios-moe/nbdist/
+/headless/nbdist/
+/server/nbdist/
+/shared/nbdist/
+
+nbactions.xml
+nb-configuration.xml
+
+## OS-Specific:
+.DS_Store
+Thumbs.db
+
+## Miscellaneous:
+*~
+*.*#
+*#*#
+/.kotlin/
+/assets/assets.txt
+
+## Special cases:
+
+## There is a resource-config.json file generated by nativeimage.gradle if you use Graal Native Image.
+## Some usage may need extra resource configuration in a different file with the same name.
+## You could also add that configuration to the text in nativeimage.gradle .
+## You should delete or comment out the next line if you have configuration in a different resource-config.json .
+**/resource-config.json
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5fe1c26
--- /dev/null
+++ b/README.md
@@ -0,0 +1,33 @@
+# multiplayer-kryonet
+
+A [libGDX](https://libgdx.com/) project generated with [gdx-liftoff](https://github.com/libgdx/gdx-liftoff).
+
+This project was generated with a template including simple application launchers and an `ApplicationAdapter` extension that draws libGDX logo.
+
+## Platforms
+
+- `core`: Main module with the application logic shared by all platforms.
+- `lwjgl3`: Primary desktop platform using LWJGL3; was called 'desktop' in older docs.
+
+## Gradle
+
+This project uses [Gradle](https://gradle.org/) to manage dependencies.
+The Gradle wrapper was included, so you can run Gradle tasks using `gradlew.bat` or `./gradlew` commands.
+Useful Gradle tasks and flags:
+
+- `--continue`: when using this flag, errors will not stop the tasks from running.
+- `--daemon`: thanks to this flag, Gradle daemon will be used to run chosen tasks.
+- `--offline`: when using this flag, cached dependency archives will be used.
+- `--refresh-dependencies`: this flag forces validation of all dependencies. Useful for snapshot versions.
+- `build`: builds sources and archives of every project.
+- `cleanEclipse`: removes Eclipse project data.
+- `cleanIdea`: removes IntelliJ project data.
+- `clean`: removes `build` folders, which store compiled classes and built archives.
+- `eclipse`: generates Eclipse project data.
+- `idea`: generates IntelliJ project data.
+- `lwjgl3:jar`: builds application's runnable jar, which can be found at `lwjgl3/build/libs`.
+- `lwjgl3:run`: starts the application.
+- `test`: runs unit tests (if any).
+
+Note that most tasks that are not specific to a single project can be run with `name:` prefix, where the `name` should be replaced with the ID of a specific project.
+For example, `core:clean` removes `build` folder only from the `core` project.
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..113aa97
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,69 @@
+buildscript {
+  repositories {
+    mavenCentral()
+    gradlePluginPortal()
+    mavenLocal()
+    google()
+    maven { url = 'https://central.sonatype.com/repository/maven-snapshots/' }
+  }
+  dependencies {
+
+
+  }
+}
+
+allprojects {
+  apply plugin: 'eclipse'
+  apply plugin: 'idea'
+
+  // This allows you to "Build and run using IntelliJ IDEA", an option in IDEA's Settings.
+  idea {
+    module {
+      outputDir = file('build/classes/java/main')
+      testOutputDir = file('build/classes/java/test')
+    }
+  }
+}
+
+configure(subprojects) {
+  apply plugin: 'java-library'
+  java.sourceCompatibility = 21
+
+  // From https://lyze.dev/2021/04/29/libGDX-Internal-Assets-List/
+  // The article can be helpful when using assets.txt in your project.
+  tasks.register('generateAssetList') {
+    inputs.dir("${project.rootDir}/assets/")
+    // projectFolder/assets
+    File assetsFolder = new File("${project.rootDir}/assets/")
+    // projectFolder/assets/assets.txt
+    File assetsFile = new File(assetsFolder, "assets.txt")
+    // delete that file in case we've already created it
+    assetsFile.delete()
+
+    // iterate through all files inside that folder
+    // convert it to a relative path
+    // and append it to the file assets.txt
+    fileTree(assetsFolder).collect { assetsFolder.relativePath(it) }.sort().each {
+      assetsFile.append(it + "\n")
+    }
+  }
+  processResources.dependsOn 'generateAssetList'
+
+  compileJava {
+    options.incremental = true
+  }
+}
+
+subprojects {
+  version = "$projectVersion"
+  ext.appName = 'multiplayer-kryonet'
+  repositories {
+    mavenCentral()
+    // You may want to remove the following line if you have errors downloading dependencies.
+    mavenLocal()
+    maven { url = 'https://central.sonatype.com/repository/maven-snapshots/' }
+    maven { url = 'https://jitpack.io' }
+  }
+}
+
+eclipse.project.name = 'multiplayer-kryonet' + '-parent'
diff --git a/core/build.gradle b/core/build.gradle
new file mode 100644
index 0000000..f66daf3
--- /dev/null
+++ b/core/build.gradle
@@ -0,0 +1,17 @@
+[compileJava, compileTestJava]*.options*.encoding = 'UTF-8'
+eclipse.project.name = appName + '-core'
+
+dependencies {
+  api "com.badlogicgames.gdx:gdx:$gdxVersion"
+  api "com.github.crykn:kryonet:$kryoNetVersion"
+  implementation project(':shared')
+
+  if(enableGraalNative == 'true') {
+    implementation "io.github.berstanio:gdx-svmhelper-annotations:$graalHelperVersion"
+    implementation(project(":shared"))
+  }
+}
+
+jar {
+  duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+}
diff --git a/core/src/main/java/io/github/eldek0/Main.java b/core/src/main/java/io/github/eldek0/Main.java
new file mode 100644
index 0000000..e82e849
--- /dev/null
+++ b/core/src/main/java/io/github/eldek0/Main.java
@@ -0,0 +1,17 @@
+package io.github.eldek0;
+
+import com.badlogic.gdx.Game;
+import io.github.eldek0.game.MultiplayerScreen;
+
+public class Main extends Game {
+
+    @Override
+    public void create() {
+        setScreen(new MultiplayerScreen());
+    }
+
+    @Override
+    public void dispose() {
+        super.dispose();
+    }
+}
diff --git a/core/src/main/java/io/github/eldek0/game/MultiplayerScreen.java b/core/src/main/java/io/github/eldek0/game/MultiplayerScreen.java
new file mode 100644
index 0000000..717383f
--- /dev/null
+++ b/core/src/main/java/io/github/eldek0/game/MultiplayerScreen.java
@@ -0,0 +1,99 @@
+package io.github.eldek0.game;
+
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.Input;
+import com.badlogic.gdx.Screen;
+import com.badlogic.gdx.graphics.GL20;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+import io.github.eldek0.network.GameClient;
+import io.github.eldek0.network.NetworkPackets;
+
+public class MultiplayerScreen implements Screen {
+
+    private ShapeRenderer shapeRenderer;
+    private GameClient gameClient;
+
+    private float x = 100;
+    private float y = 100;
+    private float speed = 200f;
+
+    private float sendTimer = 0f;
+
+    @Override
+    public void show() {
+        shapeRenderer = new ShapeRenderer();
+        gameClient = new GameClient();
+
+        try {
+            gameClient.connect("127.0.0.1", "Jugador");
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Override
+    public void render(float delta) {
+        update(delta);
+
+        Gdx.gl.glClearColor(0.15f, 0.15f, 0.2f, 1f);
+        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
+
+        shapeRenderer.begin(ShapeRenderer.ShapeType.Filled);
+
+        for (NetworkPackets.PlayerState player : gameClient.getPlayers().values()) {
+            shapeRenderer.rect(player.x, player.y, 32, 32);
+        }
+
+        shapeRenderer.end();
+    }
+
+    private void update(float delta) {
+        boolean moved = false;
+
+        if (Gdx.input.isKeyPressed(Input.Keys.W)) {
+            y += speed * delta;
+            moved = true;
+        }
+        if (Gdx.input.isKeyPressed(Input.Keys.S)) {
+            y -= speed * delta;
+            moved = true;
+        }
+        if (Gdx.input.isKeyPressed(Input.Keys.A)) {
+            x -= speed * delta;
+            moved = true;
+        }
+        if (Gdx.input.isKeyPressed(Input.Keys.D)) {
+            x += speed * delta;
+            moved = true;
+        }
+
+        sendTimer += delta;
+
+        if (moved && sendTimer >= 0.05f) {
+            gameClient.sendMyPosition(x, y);
+            sendTimer = 0f;
+        }
+    }
+
+    @Override
+    public void resize(int width, int height) {
+    }
+
+    @Override
+    public void pause() {
+    }
+
+    @Override
+    public void resume() {
+    }
+
+    @Override
+    public void hide() {
+    }
+
+    @Override
+    public void dispose() {
+        if (shapeRenderer != null) shapeRenderer.dispose();
+        if (gameClient != null) gameClient.stop();
+    }
+}
diff --git a/core/src/main/java/io/github/eldek0/network/GameClient.java b/core/src/main/java/io/github/eldek0/network/GameClient.java
new file mode 100644
index 0000000..db269eb
--- /dev/null
+++ b/core/src/main/java/io/github/eldek0/network/GameClient.java
@@ -0,0 +1,95 @@
+package io.github.eldek0.network;
+
+import com.esotericsoftware.kryonet.Client;
+import com.esotericsoftware.kryonet.Connection;
+import com.esotericsoftware.kryonet.Listener;
+
+import java.io.IOException;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class GameClient {
+
+    private final Client client;
+    private final Map<Integer, NetworkPackets.PlayerState> players = new ConcurrentHashMap<>();
+    private int myId = -1;
+
+    public GameClient() {
+        client = new Client();
+        Network.register(client);
+
+        client.addListener(new Listener() {
+            @Override
+            public void received(Connection connection, Object object) {
+                if (object instanceof NetworkPackets.PlayerConnected packet) {
+                    NetworkPackets.PlayerState player = new NetworkPackets.PlayerState();
+                    player.id = packet.id;
+                    player.name = packet.name;
+                    player.x = packet.x;
+                    player.y = packet.y;
+
+                    players.put(player.id, player);
+
+                    if (packet.id == connection.getID()) {
+                        myId = packet.id;
+                    }
+                }
+
+                if (object instanceof NetworkPackets.PlayerDisconnected packet) {
+                    players.remove(packet.id);
+                }
+
+                if (object instanceof NetworkPackets.PlayerMove packet) {
+                    NetworkPackets.PlayerState player = players.get(packet.id);
+                    if (player != null) {
+                        player.x = packet.x;
+                        player.y = packet.y;
+                    }
+                }
+
+                if (object instanceof NetworkPackets.WorldState packet) {
+                    players.clear();
+                    for (NetworkPackets.PlayerState p : packet.players) {
+                        players.put(p.id, p);
+                    }
+                }
+            }
+        });
+    }
+
+    public void connect(String host, String name) throws IOException {
+        client.start();
+        client.connect(5000, host, Network.TCP_PORT, Network.UDP_PORT);
+
+        NetworkPackets.Login login = new NetworkPackets.Login();
+        login.name = name;
+        client.sendTCP(login);
+    }
+
+    public void sendMyPosition(float x, float y) {
+        if (!client.isConnected() || myId == -1) return;
+
+        NetworkPackets.PlayerMove move = new NetworkPackets.PlayerMove();
+        move.id = myId;
+        move.x = x;
+        move.y = y;
+
+        client.sendUDP(move);
+    }
+
+    public Map<Integer, NetworkPackets.PlayerState> getPlayers() {
+        return players;
+    }
+
+    public int getMyId() {
+        return myId;
+    }
+
+    public boolean isConnected() {
+        return client.isConnected();
+    }
+
+    public void stop() {
+        client.stop();
+    }
+}
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..2388c3a
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,20 @@
+# This doesn't need to be false, and some projects may be able to take advantage of setting daemon to true.
+# We set it to false by default in order to avoid too many daemons from being created and persisting; each needs RAM.
+org.gradle.daemon=false
+# Sets starting memory usage to 512MB, maximum memory usage to 1GB, and tries to set as much to use Unicode as we can.
+org.gradle.jvmargs=-Xms512M -Xmx1G -Dfile.encoding=UTF-8 -Dconsole.encoding=UTF-8
+# "Configure on-demand" must be false because it breaks projects that have Android modules. The default is also false.
+org.gradle.configureondemand=false
+# The logging level determines which messages get shown about how Gradle itself is working, such as if build.gradle
+# files are fully future-proof (which they never are, because Gradle constantly deprecates working APIs).
+# You can change 'quiet' below to 'lifecycle' to use Gradle's default behavior, which shows some confusing messages.
+# You could instead change 'quiet' below to 'info' to see info that's important mainly while debugging build files.
+# Note that if you want to use Gradle Build Scans, you should set the below logging level to 'lifecycle', otherwise
+# the link to the scan won't get shown at all.
+# Documented at: https://docs.gradle.org/current/userguide/command_line_interface.html#sec:command_line_logging
+org.gradle.logging.level=quiet
+kryoNetVersion=2.22.9
+graalHelperVersion=2.0.1
+enableGraalNative=false
+gdxVersion=1.14.0
+projectVersion=1.0.0
diff --git a/gradle/gradle-daemon-jvm.properties b/gradle/gradle-daemon-jvm.properties
new file mode 100644
index 0000000..5d47bf4
--- /dev/null
+++ b/gradle/gradle-daemon-jvm.properties
@@ -0,0 +1,12 @@
+#This file is generated by updateDaemonJvm
+toolchainUrl.FREE_BSD.AARCH64=https\://api.foojay.io/disco/v3.0/ids/df211d3c3eefdc408b462041881bc575/redirect
+toolchainUrl.FREE_BSD.X86_64=https\://api.foojay.io/disco/v3.0/ids/93aeea858331bd6bb00ba94759830234/redirect
+toolchainUrl.LINUX.AARCH64=https\://api.foojay.io/disco/v3.0/ids/df211d3c3eefdc408b462041881bc575/redirect
+toolchainUrl.LINUX.X86_64=https\://api.foojay.io/disco/v3.0/ids/b41931cf1e70bc8e08d7dd19c343ef00/redirect
+toolchainUrl.MAC_OS.AARCH64=https\://api.foojay.io/disco/v3.0/ids/3426ffcaa54c3f62406beb1f1ab8b179/redirect
+toolchainUrl.MAC_OS.X86_64=https\://api.foojay.io/disco/v3.0/ids/d6690dfd71c4c91e08577437b5b2beb0/redirect
+toolchainUrl.UNIX.AARCH64=https\://api.foojay.io/disco/v3.0/ids/df211d3c3eefdc408b462041881bc575/redirect
+toolchainUrl.UNIX.X86_64=https\://api.foojay.io/disco/v3.0/ids/b41931cf1e70bc8e08d7dd19c343ef00/redirect
+toolchainUrl.WINDOWS.AARCH64=https\://api.foojay.io/disco/v3.0/ids/1e91f45234d88a64dafb961c93ddc75a/redirect
+toolchainUrl.WINDOWS.X86_64=https\://api.foojay.io/disco/v3.0/ids/552c7bffe0370c66410a51c55985b511/redirect
+toolchainVersion=21
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..d997cfc
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..dbc3ce4
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.0-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000..0262dcb
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,248 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/b631911858264c0b6e4d6603d677ff5218766cee/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..c4bdd3a
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,93 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/lwjgl3/build.gradle b/lwjgl3/build.gradle
new file mode 100644
index 0000000..7505ddd
--- /dev/null
+++ b/lwjgl3/build.gradle
@@ -0,0 +1,186 @@
+
+buildscript {
+  repositories {
+    gradlePluginPortal()
+  }
+  dependencies {
+    classpath "io.github.fourlastor:construo:2.1.0"
+    if(enableGraalNative == 'true') {
+      classpath "org.graalvm.buildtools.native:org.graalvm.buildtools.native.gradle.plugin:0.9.28"
+    }
+  }
+}
+plugins {
+  id "application"
+}
+apply plugin: 'io.github.fourlastor.construo'
+
+
+import io.github.fourlastor.construo.Target
+
+sourceSets.main.resources.srcDirs += [ rootProject.file('assets').path ]
+application.mainClass = 'io.github.eldek0.lwjgl3.Lwjgl3Launcher'
+application.applicationName = appName
+eclipse.project.name = appName + '-lwjgl3'
+java.sourceCompatibility = 21
+java.targetCompatibility = 21
+if (JavaVersion.current().isJava9Compatible()) {
+        compileJava.options.release.set(21)
+}
+
+dependencies {
+  implementation "com.badlogicgames.gdx:gdx-backend-lwjgl3:$gdxVersion"
+  implementation "com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-desktop"
+  implementation project(':core')
+
+  if(enableGraalNative == 'true') {
+    implementation "io.github.berstanio:gdx-svmhelper-backend-lwjgl3:$graalHelperVersion"
+
+    }
+}
+
+def os = System.properties['os.name'].toLowerCase(Locale.ROOT)
+
+run {
+  workingDir = rootProject.file('assets').path
+// You can uncomment the next line if your IDE claims a build failure even when the app closed properly.
+  //setIgnoreExitValue(true)
+
+  if (os.contains('mac')) jvmArgs += "-XstartOnFirstThread"
+}
+
+jar {
+// sets the name of the .jar file this produces to the name of the game or app, with the version after.
+  archiveFileName.set("${appName}-${projectVersion}.jar")
+// the duplicatesStrategy matters starting in Gradle 7.0; this setting works.
+  duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+  dependsOn configurations.runtimeClasspath
+  from { configurations.runtimeClasspath.collect { it.isDirectory() ? it : zipTree(it) } }
+// these "exclude" lines remove some unnecessary duplicate files in the output JAR.
+  exclude('META-INF/INDEX.LIST', 'META-INF/*.SF', 'META-INF/*.DSA', 'META-INF/*.RSA')
+  dependencies {
+    exclude('META-INF/INDEX.LIST', 'META-INF/maven/**')
+  }
+// setting the manifest makes the JAR runnable.
+// enabling native access helps avoid a warning when Java 24 or later runs the JAR.
+// setting Multi-Release to true allows LWJGL3 to use different classes on recent Java versions.
+  manifest {
+    attributes 'Main-Class': application.mainClass, 'Enable-Native-Access': 'ALL-UNNAMED', 'Multi-Release': 'true'
+  }
+// this last step may help on some OSes that need extra instruction to make runnable JARs.
+  doLast {
+    file(archiveFile).setExecutable(true, false)
+  }
+}
+
+// Builds a JAR that only includes the files needed to run on macOS, not Windows or Linux.
+// The file size for a Mac-only JAR is about 7MB smaller than a cross-platform JAR.
+tasks.register("jarMac") {
+  dependsOn("jar")
+  group("build")
+  jar.archiveFileName.set("${appName}-${projectVersion}-mac.jar")
+  jar.exclude("windows/x86/**", "windows/x64/**", "linux/arm32/**", "linux/arm64/**", "linux/x64/**", "**/*.dll", "**/*.so",
+    'META-INF/INDEX.LIST', 'META-INF/*.SF', 'META-INF/*.DSA', 'META-INF/*.RSA')
+  dependencies {
+    jar.exclude("windows/x86/**", "windows/x64/**", "linux/arm32/**", "linux/arm64/**", "linux/x64/**",
+      'META-INF/INDEX.LIST', 'META-INF/maven/**')
+  }
+}
+
+// Builds a JAR that only includes the files needed to run on Linux, not Windows or macOS.
+// The file size for a Linux-only JAR is about 5MB smaller than a cross-platform JAR.
+tasks.register("jarLinux") {
+  dependsOn("jar")
+  group("build")
+  jar.archiveFileName.set("${appName}-${projectVersion}-linux.jar")
+  jar.exclude("windows/x86/**", "windows/x64/**", "macos/arm64/**", "macos/x64/**", "**/*.dll", "**/*.dylib",
+    'META-INF/INDEX.LIST', 'META-INF/*.SF', 'META-INF/*.DSA', 'META-INF/*.RSA')
+  dependencies {
+    jar.exclude("windows/x86/**", "windows/x64/**", "macos/arm64/**", "macos/x64/**",
+      'META-INF/INDEX.LIST', 'META-INF/maven/**')
+  }
+}
+
+// Builds a JAR that only includes the files needed to run on Windows, not Linux or macOS.
+// The file size for a Windows-only JAR is about 6MB smaller than a cross-platform JAR.
+tasks.register("jarWin") {
+  dependsOn("jar")
+  group("build")
+  jar.archiveFileName.set("${appName}-${projectVersion}-win.jar")
+  jar.exclude("macos/arm64/**", "macos/x64/**", "linux/arm32/**", "linux/arm64/**", "linux/x64/**", "**/*.dylib", "**/*.so",
+    'META-INF/INDEX.LIST', 'META-INF/*.SF', 'META-INF/*.DSA', 'META-INF/*.RSA')
+  dependencies {
+    jar.exclude("macos/arm64/**", "macos/x64/**", "linux/arm32/**", "linux/arm64/**", "linux/x64/**",
+      'META-INF/INDEX.LIST', 'META-INF/maven/**')
+  }
+}
+
+construo {
+  // name of the executable
+  name.set(appName)
+  // human-readable name, used for example in the `.app` name for macOS
+  humanName.set(appName)
+  jlink {
+    guessModulesFromJar.set(false)
+    // You may need to add more modules, as needed.
+    modules.addAll("java.base", "java.management", "java.desktop", "jdk.unsupported")
+  }
+
+  targets.configure {
+    register("linuxX64", Target.Linux) {
+      architecture.set(Target.Architecture.X86_64)
+      jdkUrl.set("https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21.0.10%2B7/OpenJDK21U-jdk_x64_linux_hotspot_21.0.10_7.tar.gz")
+      // Linux does not currently have a way to set the icon on the executable
+    }
+    register("macM1", Target.MacOs) {
+      architecture.set(Target.Architecture.AARCH64)
+      jdkUrl.set("https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21.0.10%2B7/OpenJDK21U-jdk_aarch64_mac_hotspot_21.0.10_7.tar.gz")
+      // macOS needs an identifier
+      identifier.set("io.github.eldek0." + appName)
+      // Optional: icon for macOS, as an ICNS file
+      macIcon.set(project.file("icons/logo.icns"))
+    }
+    register("macX64", Target.MacOs) {
+      architecture.set(Target.Architecture.X86_64)
+      jdkUrl.set("https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21.0.10%2B7/OpenJDK21U-jdk_x64_mac_hotspot_21.0.10_7.tar.gz")
+      // macOS needs an identifier
+      identifier.set("io.github.eldek0." + appName)
+      // Optional: icon for macOS, as an ICNS file
+      macIcon.set(project.file("icons/logo.icns"))
+    }
+    register("winX64", Target.Windows) {
+      architecture.set(Target.Architecture.X86_64)
+      // Optional: icon for Windows, as a PNG
+      icon.set(project.file("icons/logo.png"))
+      jdkUrl.set("https://github.com/adoptium/temurin21-binaries/releases/download/jdk-21.0.10%2B7/OpenJDK21U-jdk_x64_windows_hotspot_21.0.10_7.zip")
+      // Uncomment the next line to show a console when the game runs, to print messages.
+      //useConsole.set(true)
+    }
+  }
+}
+
+// Equivalent to the jar task; here for compatibility with gdx-setup.
+tasks.register('dist') {
+  dependsOn 'jar'
+}
+
+distributions {
+  main {
+    contents {
+      into('libs') {
+        project.configurations.runtimeClasspath.files.findAll { file ->
+          file.getName() != project.tasks.jar.outputs.files.singleFile.name
+        }.each { file ->
+          exclude file.name
+        }
+      }
+    }
+  }
+}
+
+startScripts.dependsOn(':lwjgl3:jar')
+startScripts.classpath = project.tasks.jar.outputs.files
+
+if(enableGraalNative == 'true') {
+  apply from: file("nativeimage.gradle")
+}
diff --git a/lwjgl3/icons/logo.icns b/lwjgl3/icons/logo.icns
new file mode 100644
index 0000000..5e41ad7
Binary files /dev/null and b/lwjgl3/icons/logo.icns differ
diff --git a/lwjgl3/icons/logo.ico b/lwjgl3/icons/logo.ico
new file mode 100644
index 0000000..c4f2d5e
Binary files /dev/null and b/lwjgl3/icons/logo.ico differ
diff --git a/lwjgl3/icons/logo.png b/lwjgl3/icons/logo.png
new file mode 100644
index 0000000..f810616
Binary files /dev/null and b/lwjgl3/icons/logo.png differ
diff --git a/lwjgl3/nativeimage.gradle b/lwjgl3/nativeimage.gradle
new file mode 100644
index 0000000..bee3fd2
--- /dev/null
+++ b/lwjgl3/nativeimage.gradle
@@ -0,0 +1,54 @@
+
+project(":lwjgl3") {
+  apply plugin: "org.graalvm.buildtools.native"
+
+  graalvmNative {
+    binaries {
+      main {
+        imageName = appName
+        mainClass = application.mainClass
+        requiredVersion = '23.0'
+        buildArgs.add("-march=compatibility")
+        jvmArgs.addAll("-Dfile.encoding=UTF8")
+        sharedLibrary = false
+        resources.autodetect()
+      }
+    }
+  }
+
+  run {
+    doNotTrackState("Running the app should not be affected by Graal.")
+  }
+
+  // Modified from https://lyze.dev/2021/04/29/libGDX-Internal-Assets-List/ ; thanks again, Lyze!
+  // This creates a resource-config.json file based on the contents of the assets folder (and the libGDX icons).
+  // This file is used by Graal Native to embed those specific files.
+  // This has to run before nativeCompile, so it runs at the start of an unrelated resource-handling command.
+  generateResourcesConfigFile.doFirst {
+    def assetsFolder = new File("${project.rootDir}/assets/")
+    def lwjgl3 = project(':lwjgl3')
+    def resFolder = new File("${lwjgl3.projectDir}/src/main/resources/META-INF/native-image/${lwjgl3.ext.appName}")
+    resFolder.mkdirs()
+    def resFile = new File(resFolder, "resource-config.json")
+    resFile.delete()
+    resFile.append(
+            """{
+  "resources":{
+  "includes":[
+    {
+      "pattern": ".*(""")
+    // This adds every filename in the assets/ folder to a pattern that adds those files as resources.
+    fileTree(assetsFolder).each {
+      // The backslash-Q and backslash-E escape the start and end of a literal string, respectively.
+      resFile.append("\\\\Q${it.name}\\\\E|")
+    }
+    // We also match all of the window icon images this way and the font files that are part of libGDX.
+    resFile.append(
+            """libgdx.+\\\\.png|lsans.+)"
+    }
+  ]},
+  "bundles":[]
+}"""
+    )
+  }
+}
diff --git a/lwjgl3/src/main/java/io/github/eldek0/lwjgl3/Lwjgl3Launcher.java b/lwjgl3/src/main/java/io/github/eldek0/lwjgl3/Lwjgl3Launcher.java
new file mode 100644
index 0000000..3fe8cea
--- /dev/null
+++ b/lwjgl3/src/main/java/io/github/eldek0/lwjgl3/Lwjgl3Launcher.java
@@ -0,0 +1,48 @@
+package io.github.eldek0.lwjgl3;
+
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application;
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3ApplicationConfiguration;
+import io.github.eldek0.Main;
+
+/** Launches the desktop (LWJGL3) application. */
+public class Lwjgl3Launcher {
+    public static void main(String[] args) {
+        if (StartupHelper.startNewJvmIfRequired()) return; // This handles macOS support and helps on Windows.
+        createApplication();
+    }
+
+    private static Lwjgl3Application createApplication() {
+        return new Lwjgl3Application(new Main(), getDefaultConfiguration());
+    }
+
+    private static Lwjgl3ApplicationConfiguration getDefaultConfiguration() {
+        Lwjgl3ApplicationConfiguration configuration = new Lwjgl3ApplicationConfiguration();
+        configuration.setTitle("multiplayer-kryonet");
+        //// Vsync limits the frames per second to what your hardware can display, and helps eliminate
+        //// screen tearing. This setting doesn't always work on Linux, so the line after is a safeguard.
+        configuration.useVsync(true);
+        //// Limits FPS to the refresh rate of the currently active monitor, plus 1 to try to match fractional
+        //// refresh rates. The Vsync setting above should limit the actual FPS to match the monitor.
+        configuration.setForegroundFPS(Lwjgl3ApplicationConfiguration.getDisplayMode().refreshRate + 1);
+        //// If you remove the above line and set Vsync to false, you can get unlimited FPS, which can be
+        //// useful for testing performance, but can also be very stressful to some hardware.
+        //// You may also need to configure GPU drivers to fully disable Vsync; this can cause screen tearing.
+
+        configuration.setWindowedMode(640, 480);
+        //// You can change these files; they are in lwjgl3/src/main/resources/ .
+        //// They can also be loaded from the root of assets/ .
+        configuration.setWindowIcon("libgdx128.png", "libgdx64.png", "libgdx32.png", "libgdx16.png");
+
+        //// This could improve compatibility with Windows machines with buggy OpenGL drivers, Macs
+        //// with Apple Silicon that have to emulate compatibility with OpenGL anyway, and more.
+        //// This uses the dependency `com.badlogicgames.gdx:gdx-lwjgl3-angle` to function.
+        //// You would need to add this line to lwjgl3/build.gradle , below the dependency on `gdx-backend-lwjgl3`:
+        ////     implementation "com.badlogicgames.gdx:gdx-lwjgl3-angle:$gdxVersion"
+        //// You can choose to add the following line and the mentioned dependency if you want; they
+        //// are not intended for games that use GL30 (which is compatibility with OpenGL ES 3.0).
+        //// Know that it might not work well in some cases.
+//        configuration.setOpenGLEmulation(Lwjgl3ApplicationConfiguration.GLEmulation.ANGLE_GLES20, 0, 0);
+
+        return configuration;
+    }
+}
\ No newline at end of file
diff --git a/lwjgl3/src/main/java/io/github/eldek0/lwjgl3/StartupHelper.java b/lwjgl3/src/main/java/io/github/eldek0/lwjgl3/StartupHelper.java
new file mode 100644
index 0000000..4843a67
--- /dev/null
+++ b/lwjgl3/src/main/java/io/github/eldek0/lwjgl3/StartupHelper.java
@@ -0,0 +1,227 @@
+/*
+ * Copyright 2020 damios
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// Note, the above license and copyright applies to this file only.
+package io.github.eldek0.lwjgl3;
+
+import com.badlogic.gdx.Version;
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3NativesLoader;
+
+import org.lwjgl.system.JNI;
+import org.lwjgl.system.linux.UNISTD;
+import org.lwjgl.system.macosx.LibC;
+import org.lwjgl.system.macosx.ObjCRuntime;
+
+import java.io.File;
+import java.lang.management.ManagementFactory;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+/**
+ * A helper object for game startup, featuring three utilities related to LWJGL3 on various operating systems.
+ * <p>
+ * The utilities are as follows:
+ * <ul>
+ *  <li> Windows: Prevents a common crash related to LWJGL3's extraction of shared library files.</li>
+ *  <li> macOS: Spawns a child JVM process with {@code -XstartOnFirstThread} in the JVM args (if it was not already).
+ *  This is required for LWJGL3 to work on macOS.</li>
+ *  <li> Linux (NVIDIA GPUs only): Spawns a child JVM process with the {@code __GL_THREADED_OPTIMIZATIONS}
+ *  {@link System#getenv(String) Environment Variable} set to {@code 0} (if it was not already). This is required for
+ *  LWJGL3 to work on Linux with NVIDIA GPUs.</li>
+ * </ul>
+ * <a href="https://jvm-gaming.org/t/starting-jvm-on-mac-with-xstartonfirstthread-programmatically/57547">Based on this java-gaming.org post by kappa</a>
+ * @author damios
+ */
+public class StartupHelper {
+
+	private StartupHelper() {}
+
+	private static final String JVM_RESTARTED_ARG = "jvmIsRestarted";
+
+	/**
+	 * Must only be called on Linux. Check OS first (or use short-circuit evaluation)!
+	 * @return whether NVIDIA drivers are present on Linux.
+	 */
+	public static boolean isLinuxNvidia() {
+		String[] drivers = new File("/proc/driver").list(
+			(dir, path) -> path.toUpperCase(Locale.ROOT).contains("NVIDIA")
+		);
+		if (drivers == null) return false;
+		return drivers.length > 0;
+	}
+
+	/**
+	 * Applies the utilities as described by {@link StartupHelper}'s Javadoc.
+	 * <p>
+	 * All {@link System#getenv() Environment Variables} are copied to the child JVM process (if it is spawned), as
+	 * specified by {@link ProcessBuilder#environment()}; the same applies for
+	 * {@link System#getProperties() System Properties}.
+	 * <p>
+	 * <b>Usage:</b>
+	 * <pre><code>
+	 * public static void main(String[] args) {
+	 * 	 if (StartupHelper.startNewJvmIfRequired()) return;
+	 * 	 // ... The rest of main() goes here, as normal.
+	 * }
+	 * </code></pre>
+	 * @return whether a child JVM process was spawned or not.
+	 */
+	public static boolean startNewJvmIfRequired() {
+		return startNewJvmIfRequired(true);
+	}
+
+	/**
+	 * Applies the utilities as described by {@link StartupHelper}'s Javadoc.
+	 * <p>
+	 * All {@link System#getenv() Environment Variables} are copied to the child JVM process (if it is spawned), as
+	 * specified by {@link ProcessBuilder#environment()}; the same applies for
+	 * {@link System#getProperties() System Properties}.
+	 * <p>
+	 * <b>Usage:</b>
+	 * <pre><code>
+	 * public static void main(String[] args) {
+	 *   // The parameter on the next line could instead be false if you don't want to inherit IO.
+	 * 	 if (StartupHelper.startNewJvmIfRequired(true)) return;
+	 * 	 // ... The rest of main() goes here, as normal.
+	 * }
+	 * </code></pre>
+	 * @param inheritIO whether I/O should be inherited in the child JVM process. Please note that enabling this will
+	 *                  block the thread until the child JVM process stops executing.
+	 * @return whether a child JVM process was spawned or not.
+	 */
+	public static boolean startNewJvmIfRequired(boolean inheritIO) {
+		String osName = System.getProperty("os.name").toLowerCase(Locale.ROOT);
+		if (osName.contains("mac")) return startNewJvm0(/*isMac =*/ true, inheritIO);
+		if (osName.contains("windows")) {
+			// Here, we are trying to work around an issue with how LWJGL3 loads its extracted .dll files.
+			// By default, LWJGL3 extracts to the directory specified by "java.io.tmpdir": usually, the user's home.
+			// If the user's name has non-ASCII (or some non-alphanumeric) characters in it, that would fail.
+			// By extracting to the relevant "ProgramData" folder, which is usually "C:\ProgramData", we avoid this.
+			// We also temporarily change the "user.name" property to one without any chars that would be invalid.
+			// We revert our changes immediately after loading LWJGL3 natives.
+			String programData = System.getenv("ProgramData");
+			if (programData == null) programData = "C:\\Temp"; // if ProgramData isn't set, try some fallback.
+			String prevTmpDir = System.getProperty("java.io.tmpdir", programData);
+			String prevUser = System.getProperty("user.name", "libGDX_User");
+			System.setProperty("java.io.tmpdir", programData + "\\libGDX-temp");
+			System.setProperty(
+				"user.name",
+				("User_" + prevUser.hashCode() + "_GDX" + Version.VERSION).replace('.', '_')
+			);
+			Lwjgl3NativesLoader.load();
+			System.setProperty("java.io.tmpdir", prevTmpDir);
+			System.setProperty("user.name", prevUser);
+			return false;
+		}
+		return startNewJvm0(/*isMac =*/ false, inheritIO);
+	}
+
+	private static final String MAC_JRE_ERR_MSG = "A Java installation could not be found. If you are distributing this app with a bundled JRE, be sure to set the '-XstartOnFirstThread' argument manually!";
+	private static final String LINUX_JRE_ERR_MSG = "A Java installation could not be found. If you are distributing this app with a bundled JRE, be sure to set the environment variable '__GL_THREADED_OPTIMIZATIONS' to '0'!";
+	private static final String CHILD_LOOP_ERR_MSG = "The current JVM process is a spawned child JVM process, but StartupHelper has attempted to spawn another child JVM process! This is a broken state, and should not normally happen! Your game may crash or not function properly!";
+
+	/**
+	 * Spawns a child JVM process if on macOS, or on Linux with NVIDIA drivers.
+	 * <p>
+	 * All {@link System#getenv() Environment Variables} are copied to the child JVM process (if it is spawned), as
+	 * specified by {@link ProcessBuilder#environment()}; the same applies for
+	 * {@link System#getProperties() System Properties}.
+	 * @param isMac whether the current OS is macOS. If this is `false` then the current OS is assumed to be Linux (and
+	 *             an immediate check for NVIDIA drivers is performed).
+	 * @param inheritIO whether I/O should be inherited in the child JVM process. Please note that enabling this will
+	 *                 block the thread until the child JVM process stops executing.
+	 * @return whether a child JVM process was spawned or not.
+	 */
+	public static boolean startNewJvm0(boolean isMac, boolean inheritIO) {
+		long processID = getProcessID(isMac);
+		if (!isMac) {
+			// No need to restart non-NVIDIA Linux
+			if (!isLinuxNvidia()) return false;
+			// check whether __GL_THREADED_OPTIMIZATIONS is already disabled
+			if ("0".equals(System.getenv("__GL_THREADED_OPTIMIZATIONS"))) return false;
+		} else {
+			// There is no need for -XstartOnFirstThread on Graal native image
+			if (!System.getProperty("org.graalvm.nativeimage.imagecode", "").isEmpty()) return false;
+
+			// Checks if we are already on the main thread, such as from running via Construo.
+			long objcMsgSend = ObjCRuntime.getLibrary().getFunctionAddress("objc_msgSend");
+			long nsThread = ObjCRuntime.objc_getClass("NSThread");
+			long currentThread = JNI.invokePPP(nsThread, ObjCRuntime.sel_getUid("currentThread"), objcMsgSend);
+			boolean isMainThread = JNI.invokePPZ(currentThread, ObjCRuntime.sel_getUid("isMainThread"), objcMsgSend);
+			if (isMainThread) return false;
+
+			if ("1".equals(System.getenv("JAVA_STARTED_ON_FIRST_THREAD_" + processID))) return false;
+		}
+
+		// Check whether this JVM process is a child JVM process already.
+		// This state shouldn't usually be reachable, but this stops us from endlessly spawning new child JVM processes.
+		if ("true".equals(System.getProperty(JVM_RESTARTED_ARG))) {
+			System.err.println(CHILD_LOOP_ERR_MSG);
+			return false;
+		}
+
+		// Spawn the child JVM process with updated environment variables or JVM args
+		List<String> jvmArgs = new ArrayList<>();
+		// The following line is used assuming you target Java 8, the minimum for LWJGL3.
+		String javaExecPath = System.getProperty("java.home") + "/bin/java";
+		// If targeting Java 9 or higher, you could use the following instead of the above line:
+		//String javaExecPath = ProcessHandle.current().info().command().orElseThrow()
+		if (!(new File(javaExecPath).exists())) {
+			System.err.println(getJreErrMsg(isMac));
+			return false;
+		}
+
+		jvmArgs.add(javaExecPath);
+		if (isMac) jvmArgs.add("-XstartOnFirstThread");
+		jvmArgs.add("-D" + JVM_RESTARTED_ARG + "=true");
+		jvmArgs.addAll(ManagementFactory.getRuntimeMXBean().getInputArguments());
+		jvmArgs.add("-cp");
+		jvmArgs.add(System.getProperty("java.class.path"));
+		String mainClass = System.getenv("JAVA_MAIN_CLASS_" + processID);
+		if (mainClass == null) {
+			StackTraceElement[] trace = Thread.currentThread().getStackTrace();
+			if (trace.length > 0) mainClass = trace[trace.length - 1].getClassName();
+			else {
+				System.err.println("The main class could not be determined.");
+				return false;
+			}
+		}
+		jvmArgs.add(mainClass);
+
+		try {
+			ProcessBuilder processBuilder = new ProcessBuilder(jvmArgs);
+			if (!isMac) processBuilder.environment().put("__GL_THREADED_OPTIMIZATIONS", "0");
+
+			if (!inheritIO) processBuilder.start();
+			else processBuilder.inheritIO().start().waitFor();
+		} catch (Exception e) {
+			System.err.println("There was a problem restarting the JVM.");
+			// noinspection CallToPrintStackTrace
+			e.printStackTrace();
+		}
+
+		return true;
+	}
+
+	private static String getJreErrMsg(boolean isMac) {
+		if (isMac) return MAC_JRE_ERR_MSG;
+		else return LINUX_JRE_ERR_MSG;
+	}
+
+	private static long getProcessID(boolean isMac) {
+		if (isMac) return LibC.getpid();
+		else return UNISTD.getpid();
+	}
+}
\ No newline at end of file
diff --git a/lwjgl3/src/main/resources/libgdx128.png b/lwjgl3/src/main/resources/libgdx128.png
new file mode 100644
index 0000000..f810616
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diff --git a/lwjgl3/src/main/resources/libgdx16.png b/lwjgl3/src/main/resources/libgdx16.png
new file mode 100644
index 0000000..a6b1327
Binary files /dev/null and b/lwjgl3/src/main/resources/libgdx16.png differ
diff --git a/lwjgl3/src/main/resources/libgdx32.png b/lwjgl3/src/main/resources/libgdx32.png
new file mode 100644
index 0000000..9447b39
Binary files /dev/null and b/lwjgl3/src/main/resources/libgdx32.png differ
diff --git a/lwjgl3/src/main/resources/libgdx64.png b/lwjgl3/src/main/resources/libgdx64.png
new file mode 100644
index 0000000..7513f3b
Binary files /dev/null and b/lwjgl3/src/main/resources/libgdx64.png differ
diff --git a/server/build.gradle b/server/build.gradle
new file mode 100644
index 0000000..b3c94b2
--- /dev/null
+++ b/server/build.gradle
@@ -0,0 +1,29 @@
+plugins {
+  id 'java'
+  id 'application'
+}
+
+group = 'io.github.eldek0'
+version = "$projectVersion"
+
+repositories {
+  mavenCentral()
+  mavenLocal()
+  maven { url = 'https://jitpack.io' }
+}
+
+dependencies {
+  implementation project(':shared')
+
+  testImplementation platform('org.junit:junit-bom:5.10.0')
+  testImplementation 'org.junit.jupiter:junit-jupiter'
+  testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+}
+
+application {
+  mainClass = 'io.github.eldek0.GameServer'
+}
+
+tasks.test {
+  useJUnitPlatform()
+}
diff --git a/server/src/main/java/io/github/eldek0/GameServer.java b/server/src/main/java/io/github/eldek0/GameServer.java
new file mode 100644
index 0000000..87f3297
--- /dev/null
+++ b/server/src/main/java/io/github/eldek0/GameServer.java
@@ -0,0 +1,103 @@
+package io.github.eldek0;
+
+import com.esotericsoftware.kryonet.Connection;
+import com.esotericsoftware.kryonet.Listener;
+import com.esotericsoftware.kryonet.Server;
+import io.github.eldek0.network.Network;
+import io.github.eldek0.network.NetworkPackets;
+
+import java.io.IOException;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class GameServer {
+
+    private final Server server;
+    private final Map<Integer, NetworkPackets.PlayerState> players = new ConcurrentHashMap<>();
+
+    public GameServer() {
+        server = new Server();
+        Network.register(server);
+
+        server.addListener(new Listener() {
+            @Override
+            public void connected(Connection connection) {
+                System.out.println("Cliente conectado: " + connection.getID());
+            }
+
+            @Override
+            public void disconnected(Connection connection) {
+                int id = connection.getID();
+                players.remove(id);
+
+                NetworkPackets.PlayerDisconnected packet = new NetworkPackets.PlayerDisconnected();
+                packet.id = id;
+                server.sendToAllTCP(packet);
+
+                System.out.println("Cliente desconectado: " + id);
+            }
+
+            @Override
+            public void received(Connection connection, Object object) {
+                if (object instanceof NetworkPackets.Login login) {
+                    handleLogin(connection, login);
+                }
+
+                if (object instanceof NetworkPackets.PlayerMove move) {
+                    handleMove(connection, move);
+                }
+            }
+        });
+    }
+
+    private void handleLogin(Connection connection, NetworkPackets.Login login) {
+        NetworkPackets.PlayerState player = new NetworkPackets.PlayerState();
+        player.id = connection.getID();
+        player.name = login.name;
+        player.x = 100;
+        player.y = 100;
+
+        players.put(player.id, player);
+
+        NetworkPackets.PlayerConnected joined = new NetworkPackets.PlayerConnected();
+        joined.id = player.id;
+        joined.name = player.name;
+        joined.x = player.x;
+        joined.y = player.y;
+
+        server.sendToAllTCP(joined);
+
+        sendFullState(connection);
+    }
+
+    private void handleMove(Connection connection, NetworkPackets.PlayerMove move) {
+        NetworkPackets.PlayerState player = players.get(connection.getID());
+        if (player == null) return;
+
+        player.x = move.x;
+        player.y = move.y;
+
+        NetworkPackets.PlayerMove update = new NetworkPackets.PlayerMove();
+        update.id = player.id;
+        update.x = player.x;
+        update.y = player.y;
+
+        server.sendToAllUDP(update);
+    }
+
+    private void sendFullState(Connection connection) {
+        NetworkPackets.WorldState worldState = new NetworkPackets.WorldState();
+        worldState.players.addAll(players.values());
+        connection.sendTCP(worldState);
+    }
+
+    public void start() throws IOException {
+        server.start();
+        server.bind(Network.TCP_PORT, Network.UDP_PORT);
+        System.out.println("Servidor iniciado.");
+    }
+
+    public static void main(String[] args) throws IOException {
+        new GameServer().start();
+    }
+}
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..df27f80
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,11 @@
+plugins {
+  // Applies the foojay-resolver plugin to allow automatic download of JDKs.
+  id("org.gradle.toolchains.foojay-resolver-convention") version "1.0.0"
+}
+// A list of which subprojects to load as part of the same larger project.
+// You can remove Strings from the list and reload the Gradle project
+// if you want to temporarily disable a subproject.
+include 'lwjgl3', 'core'
+
+include 'server'
+include 'shared'
\ No newline at end of file
diff --git a/shared/build.gradle b/shared/build.gradle
new file mode 100644
index 0000000..feac665
--- /dev/null
+++ b/shared/build.gradle
@@ -0,0 +1,16 @@
+plugins {
+  id 'java-library'
+}
+
+group = 'io.github.eldek0'
+version = "$projectVersion"
+
+repositories {
+  mavenCentral()
+  mavenLocal()
+  maven { url = 'https://jitpack.io' }
+}
+
+dependencies {
+  api "com.github.crykn:kryonet:$kryoNetVersion"
+}
diff --git a/shared/src/main/java/io/github/eldek0/Main.java b/shared/src/main/java/io/github/eldek0/Main.java
new file mode 100644
index 0000000..d5ab28a
--- /dev/null
+++ b/shared/src/main/java/io/github/eldek0/Main.java
@@ -0,0 +1,17 @@
+package io.github.eldek0;
+
+//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
+// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
+public class Main {
+    public static void main(String[] args) {
+        //TIP Press <shortcut actionId="ShowIntentionActions"/> with your caret at the highlighted text
+        // to see how IntelliJ IDEA suggests fixing it.
+        System.out.printf("Hello and welcome!");
+
+        for (int i = 1; i <= 5; i++) {
+            //TIP Press <shortcut actionId="Debug"/> to start debugging your code. We have set one <icon src="AllIcons.Debugger.Db_set_breakpoint"/> breakpoint
+            // for you, but you can always add more by pressing <shortcut actionId="ToggleLineBreakpoint"/>.
+            System.out.println("i = " + i);
+        }
+    }
+}
\ No newline at end of file
diff --git a/shared/src/main/java/io/github/eldek0/network/Network.java b/shared/src/main/java/io/github/eldek0/network/Network.java
new file mode 100644
index 0000000..71794d8
--- /dev/null
+++ b/shared/src/main/java/io/github/eldek0/network/Network.java
@@ -0,0 +1,23 @@
+package io.github.eldek0.network;
+
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryonet.EndPoint;
+import java.util.ArrayList;
+
+public class Network {
+    public static final int TCP_PORT = 54555;
+    public static final int UDP_PORT = 54777;
+
+    public static void register(EndPoint endPoint) {
+        Kryo kryo = endPoint.getKryo();
+
+        kryo.register(NetworkPackets.Login.class);
+        kryo.register(NetworkPackets.PlayerConnected.class);
+        kryo.register(NetworkPackets.PlayerDisconnected.class);
+        kryo.register(NetworkPackets.PlayerMove.class);
+        kryo.register(NetworkPackets.WorldState.class);
+        kryo.register(NetworkPackets.PlayerState.class);
+
+        kryo.register(ArrayList.class);
+    }
+}
diff --git a/shared/src/main/java/io/github/eldek0/network/NetworkPackets.java b/shared/src/main/java/io/github/eldek0/network/NetworkPackets.java
new file mode 100644
index 0000000..7c48fbb
--- /dev/null
+++ b/shared/src/main/java/io/github/eldek0/network/NetworkPackets.java
@@ -0,0 +1,36 @@
+package io.github.eldek0.network;
+
+public class NetworkPackets {
+
+    public static class Login {
+        public String name;
+    }
+
+    public static class PlayerConnected {
+        public int id;
+        public String name;
+        public float x;
+        public float y;
+    }
+
+    public static class PlayerDisconnected {
+        public int id;
+    }
+
+    public static class PlayerMove {
+        public int id;
+        public float x;
+        public float y;
+    }
+
+    public static class WorldState {
+        public java.util.ArrayList<PlayerState> players = new java.util.ArrayList<>();
+    }
+
+    public static class PlayerState {
+        public int id;
+        public String name;
+        public float x;
+        public float y;
+    }
+}