Initial commit

.gitignore

@@ -0,0 +1,33 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

build.gradle.kts

@@ -0,0 +1,49 @@
+plugins {
+    id("java")
+    id("java-library")
+    id("application")
+}
+
+group = "be.seeseemelk"
+version = "1.0-SNAPSHOT"
+
+val gdxVersion = "1.12.1"
+val slf4j = "2.0.17"
+val lombokVersion = "1.18.42"
+val avajeInjectVersion = "12.1"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    // Logging
+    implementation("org.slf4j:slf4j-api:${slf4j}")
+    runtimeOnly("org.slf4j:slf4j-simple:${slf4j}")
+
+    // Lombok. The plugin cannot be used as the annotation processor *must* run before Avaje's processor.
+    compileOnly("org.projectlombok:lombok:${lombokVersion}")
+    annotationProcessor("org.projectlombok:lombok:${lombokVersion}")
+    testCompileOnly("org.projectlombok:lombok:${lombokVersion}")
+    testAnnotationProcessor("org.projectlombok:lombok:${lombokVersion}")
+
+    // Dependency Injection
+    implementation("io.avaje:avaje-config:4.1")
+    implementation("io.avaje:avaje-inject:${avajeInjectVersion}")
+    annotationProcessor("io.avaje:avaje-inject-generator:${avajeInjectVersion}")
+    testImplementation("io.avaje:avaje-inject-test:${avajeInjectVersion}")
+    testAnnotationProcessor("io.avaje:avaje-inject-generator:${avajeInjectVersion}")
+
+    // LibGDX
+    api("com.badlogicgames.gdx:gdx:$gdxVersion")
+    api("com.badlogicgames.gdx:gdx-backend-lwjgl3:$gdxVersion")
+    api("com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-desktop")
+
+    testImplementation(platform("org.junit:junit-bom:5.10.0"))
+    testImplementation("org.junit.jupiter:junit-jupiter")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Thu Dec 11 19:38:52 CET 2025
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 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.
+#
+
+##############################################################################
+#
+#   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/master/subprojects/plugins/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
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&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
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$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: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$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 "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( 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
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# 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 "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@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
+
+@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=.
+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%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="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!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -0,0 +1 @@
+rootProject.name = "diceos"

src/main/java/be/seeseemelk/diceos/Bootloader.java

@@ -0,0 +1,20 @@
+package be.seeseemelk.diceos;
+
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application;
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3ApplicationConfiguration;
+import com.badlogic.gdx.graphics.glutils.HdpiMode;
+import io.avaje.inject.BeanScope;
+
+public class Bootloader {
+    public static void main(String[] args) {
+        try (var beanScope = BeanScope.builder().build()) {
+            var config = new Lwjgl3ApplicationConfiguration();
+            config.setTitle("DiceOS");
+            config.setWindowedMode(640+12, 360);
+//            config.setFullscreenMode(Lwjgl3ApplicationConfiguration.getDisplayMode());
+            //config.setResizable(false);
+            config.setHdpiMode(HdpiMode.Pixels);
+            new Lwjgl3Application(beanScope.get(DiceOS.class), config);
+        }
+    }
+}

src/main/java/be/seeseemelk/diceos/DiceOS.java

@@ -0,0 +1,73 @@
+package be.seeseemelk.diceos;
+
+import be.seeseemelk.diceos.system.DisplayService;
+import be.seeseemelk.diceos.system.OnStartup;
+import com.badlogic.gdx.ApplicationAdapter;
+import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.graphics.Texture;
+import com.badlogic.gdx.utils.ScreenUtils;
+import com.badlogic.gdx.utils.viewport.FillViewport;
+import com.badlogic.gdx.utils.viewport.Viewport;
+import io.avaje.inject.Component;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+import java.util.List;
+
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class DiceOS extends ApplicationAdapter {
+    private final DisplayService display;
+    private final List<OnStartup> startupTasks;
+    private Texture background;
+    private Texture border;
+    private Viewport viewport;
+
+    @Override
+    public void create() {
+        log.info("DiceOS starting...");
+        background = new Texture("src/main/resources/background.png");
+        border = new Texture("src/main/resources/border.png");
+        viewport = new FillViewport(2, 2);
+
+        for (var task : startupTasks) {
+            task.onStartup();
+        }
+
+        log.info("DiceOS started!");
+    }
+
+    @Override
+    public void render() {
+        display.getScreenBuffer().begin();
+        viewport.apply();
+        display.getBatch().setProjectionMatrix(viewport.getCamera().combined);
+        display.getBatch().begin();
+
+        ScreenUtils.clear(Color.GREEN);
+
+        for (int y = 0; y < display.getHeight(); y += 8) {
+            for (int x = 0; x < display.getWidth(); x += 8) {
+                display.draw(background, x, y);
+            }
+        }
+
+        var param = new DisplayService.Parameters();
+        display.draw(border, 0, 0, param);
+        param.flipX = true;
+        display.draw(border, display.getWidth() - 8, 0, param);
+        param.flipY = true;
+        display.draw(border, display.getWidth() - 8, display.getHeight() - 8, param);
+        param.flipX = false;
+        display.draw(border, 0, display.getHeight() - 8, param);
+
+        display.getBatch().end();
+        display.getScreenBuffer().end();
+
+        display.getBatch().begin();
+        display.getBatch().draw(display.getScreenBuffer().getColorBufferTexture(),
+                0, 0);
+        display.getBatch().end();
+    }
+}

src/main/java/be/seeseemelk/diceos/system/DisplayService.java

@@ -0,0 +1,53 @@
+package be.seeseemelk.diceos.system;
+
+import com.badlogic.gdx.graphics.Pixmap;
+import com.badlogic.gdx.graphics.Texture;
+import com.badlogic.gdx.graphics.g2d.SpriteBatch;
+import com.badlogic.gdx.graphics.glutils.FrameBuffer;
+import io.avaje.inject.Component;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+@RequiredArgsConstructor
+@Component
+public class DisplayService implements OnStartup {
+    @Getter
+    private FrameBuffer screenBuffer;
+    @Getter
+    private SpriteBatch batch;
+//    private final GraphicsFactory graphicsFactory;
+
+    @Override
+    public void onStartup() {
+        screenBuffer = new FrameBuffer(Pixmap.Format.RGBA8888, getWidth(), getHeight(), false);
+        batch = new SpriteBatch();
+    }
+
+    public int getWidth() {
+        return 640;
+    }
+
+    public int getHeight() {
+        return 360;
+    }
+
+    public void draw(Texture texture, int x, int y) {
+        draw(texture, x, y, Parameters.DEFAULT);
+    }
+
+    public void draw(Texture texture, int x, int y, Parameters params) {
+        batch.draw(texture,
+                x, getHeight() - y - texture.getHeight(), texture.getWidth(), texture.getHeight(),
+                0, 0, texture.getWidth(), texture.getHeight(),
+                params.flipX, params.flipY);
+    }
+
+    public static class Parameters {
+        public final static Parameters DEFAULT = new Parameters();
+
+        public boolean flipX;
+        public boolean flipY;
+    }
+}

src/main/java/be/seeseemelk/diceos/system/OnStartup.java

@@ -0,0 +1,8 @@
+package be.seeseemelk.diceos.system;
+
+/**
+ * Interface for components that need to perform actions on system startup.
+ */
+public interface OnStartup {
+    void onStartup();
+}

src/main/java/be/seeseemelk/diceos/system/gfx/Graphics.java

@@ -0,0 +1,17 @@
+package be.seeseemelk.diceos.system.gfx;
+
+import io.avaje.inject.AssistFactory;
+import lombok.RequiredArgsConstructor;
+
+/**
+ * Graphics context and rendering utilities.
+ */
+@RequiredArgsConstructor
+@AssistFactory(GraphicsFactory.class)
+public class Graphics {
+//    private final
+//
+//    public void begin() {
+//
+//    }
+}

src/main/java/be/seeseemelk/diceos/system/gfx/GraphicsFactory.java

@@ -0,0 +1,5 @@
+package be.seeseemelk.diceos.system.gfx;
+
+public interface GraphicsFactory {
+    Graphics create();
+}

src/main/java/be/seeseemelk/diceos/system/math/RandomService.java

@@ -0,0 +1,7 @@
+package be.seeseemelk.diceos.system.math;
+
+import io.avaje.inject.Component;
+
+@Component
+public class RandomService {
+}

src/main/java/be/seeseemelk/diceos/system/math/ZanzlanzFootballFormula.java

@@ -0,0 +1,18 @@
+package be.seeseemelk.diceos.system.math;
+
+/**
+ * Implementation of the Zanzlanz's Football Formula.
+ * @see https://www.youtube.com/watch?v=XDsYPXRCXAs
+ */
+public class ZanzlanzFootballFormula {
+    private int state = 1;
+
+    /**
+     * Generates the next pseudo-random number using Zanzlanz's Football Formula.
+     *
+     * @return the next pseudo-random number
+     */
+    public void nextIteration() {
+        state = (state * 25 + 102803) % 236196;
+    }
+}