chore(engine): switch to libGDX

For real

app/src/main/java/org/vibecoders/moongazer/App.java

@@ -1,25 +0,0 @@
-package org.vibecoders.moongazer;
-
-import javafx.application.Application;
-import javafx.scene.Scene;
-import javafx.scene.control.Label;
-import javafx.scene.layout.StackPane;
-import javafx.stage.Stage;
-
-public class App extends Application {
-
-    @Override
-    public void start(Stage stage) {
-        String javaVersion = System.getProperty("java.version");
-        String javafxVersion = System.getProperty("javafx.version");
-        Label l = new Label("Hello, JavaFX " + javafxVersion + ", running on Java " + javaVersion + ".");
-        Scene scene = new Scene(new StackPane(l), 640, 480);
-        stage.setScene(scene);
-        stage.show();
-    }
-
-    public static void main(String[] args) {
-        launch();
-    }
-
-}

app/src/main/java/org/vibecoders/moongazer/Constants.java

@@ -0,0 +1,15 @@
+package org.vibecoders.moongazer;
+
+/**
+ * Client configuration constants and default values
+ * used throughout the Moongazer client application.
+ */
+public class Constants {
+
+    /**
+     * Window configuration.
+     */
+    public static final int WINDOW_WIDTH = 1280;
+    public static final int WINDOW_HEIGHT = 720;
+    public static final String WINDOW_TITLE = "Moongazer";
+}

app/src/main/java/org/vibecoders/moongazer/Game.java

@@ -0,0 +1,29 @@
+package org.vibecoders.moongazer;
+
+import com.badlogic.gdx.ApplicationAdapter;
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.graphics.GL20;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import static org.vibecoders.moongazer.Constants.*;
+
+public class Game extends ApplicationAdapter {
+    private static final Logger log = LoggerFactory.getLogger(Game.class);
+
+    @Override
+    public void create() {
+        log.debug("create stub");
+    }
+
+    @Override
+    public void render() {
+        Gdx.gl.glClearColor(0, 0, 0, 1);
+        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
+    }
+
+    @Override
+    public void dispose() {
+        log.debug("stub");
+    }
+}
+

app/src/main/java/org/vibecoders/moongazer/Main.java

@@ -0,0 +1,23 @@
+package org.vibecoders.moongazer;
+
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application;
+import com.badlogic.gdx.backends.lwjgl3.Lwjgl3ApplicationConfiguration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import static org.vibecoders.moongazer.Constants.*;
+
+public class Main {
+
+    private static final Logger log = LoggerFactory.getLogger(Main.class);
+
+    public static void main(String[] args) {
+        Lwjgl3ApplicationConfiguration cfg = new Lwjgl3ApplicationConfiguration();
+        cfg.setTitle(WINDOW_TITLE);
+        cfg.setWindowedMode(WINDOW_WIDTH, WINDOW_HEIGHT);
+        cfg.useVsync(true);
+        cfg.setIdleFPS(10);
+        cfg.setWindowIcon("icons/logo.png");
+        log.info("Starting game client");
+        new Lwjgl3Application(new Game(), cfg);
+    }
+}