add menu logic

app/src/main/java/gui/menu/BaseMenu.java

@@ -0,0 +1,25 @@
+package gui.menu;
+
+import imgui.ImGui;
+
+public abstract class BaseMenu {
+
+	protected final StateMachine stateMachine;
+
+	public BaseMenu(StateMachine stateMachine) {
+		this.stateMachine = stateMachine;
+	}
+
+	public abstract void render();
+
+	public void closeMenu() {
+		this.stateMachine.popState();
+	}
+
+	protected void renderReturnButton() {
+		if (ImGui.button("Retour")) {
+			closeMenu();
+		}
+	}
+
+}

app/src/main/java/gui/menu/MainMenu.java

@@ -0,0 +1,24 @@
+package gui.menu;
+
+import imgui.ImGui;
+
+public class MainMenu extends BaseMenu {
+
+	public MainMenu(StateMachine stateMachine) {
+		super(stateMachine);
+	}
+
+	@Override
+	public void render() {
+		if (ImGui.button("Mode histoire")) {
+			this.stateMachine.pushState(new SoloMenu(this.stateMachine));
+		}
+		if (ImGui.button("Multijoueur")) {
+			this.stateMachine.pushState(new MultiMenu(this.stateMachine));
+		}
+		if (ImGui.button("Options")) {
+			this.stateMachine.pushState(new OptionsMenu(this.stateMachine));
+		}
+	}
+
+}

app/src/main/java/gui/menu/MultiMenu.java

@@ -0,0 +1,18 @@
+package gui.menu;
+
+import imgui.ImGui;
+
+public class MultiMenu extends BaseMenu {
+
+	public MultiMenu(StateMachine stateMachine) {
+		super(stateMachine);
+	}
+
+	@Override
+	public void render() {
+		// TODO Auto-generated method stub
+		ImGui.text("Multi");
+		renderReturnButton();
+	}
+
+}

app/src/main/java/gui/menu/OptionsMenu.java

@@ -0,0 +1,18 @@
+package gui.menu;
+
+import imgui.ImGui;
+
+public class OptionsMenu extends BaseMenu {
+
+	public OptionsMenu(StateMachine stateMachine) {
+		super(stateMachine);
+	}
+
+	@Override
+	public void render() {
+		// TODO Auto-generated method stub
+		ImGui.text("Options");
+		renderReturnButton();
+	}
+
+}

app/src/main/java/gui/menu/SoloMenu.java

@@ -0,0 +1,18 @@
+package gui.menu;
+
+import imgui.ImGui;
+
+public class SoloMenu extends BaseMenu {
+
+	public SoloMenu(StateMachine stateMachine) {
+		super(stateMachine);
+	}
+
+	@Override
+	public void render() {
+		// TODO Auto-generated method stub
+		ImGui.text("Solo");
+		renderReturnButton();
+	}
+
+}

app/src/main/java/gui/menu/StateMachine.java

@@ -0,0 +1,29 @@
+package gui.menu;
+
+import java.util.Stack;
+
+import imgui.ImGui;
+
+public class StateMachine {
+
+	private final Stack<BaseMenu> menus;
+
+	public StateMachine() {
+		this.menus = new Stack<>();
+	}
+
+	public void pushState(BaseMenu menu) {
+		menus.add(menu);
+	}
+
+	public void popState() {
+		menus.pop();
+	}
+
+	public void render() {
+		ImGui.begin("##Main Window");
+		menus.getLast().render();
+		ImGui.end();
+	}
+
+}