Wrapping up the Game State Manager

lesson#25 - Wrapping up the Game State Manager/ourGame/.gitignore

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+.dub
+docs.json
+__dummy.html
+docs/
+/ourgame
+ourgame.so
+ourgame.dylib
+ourgame.dll
+ourgame.a
+ourgame.lib
+ourgame-test-*
+*.exe
+*.o
+*.obj
+*.lst

lesson#25 - Wrapping up the Game State Manager/ourGame/2

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+import data;
+
+class GStateManager {
+    // private class instance
+    private static GStateManager instance;
+    
+    // IState interface
+    private IState[GameState] state;
+    
+    private GameState currGameState;
+
+    // private constructor
+    private this() { }
+
+    // return the instance; create the instance, if it wasn't created yet
+    static GStateManager getInstance() {
+        if(instance is null) {
+            instance = new GStateManager();
+        }
+
+        return instance;
+    }
+
+    // add game state
+    void add(IState state, GameState gs) {
+	this.state[gs] = state;
+    }
+
+    // remove game state
+    void remove(GameState gs) {
+	this.state.remove(gs);
+    }
+
+    // set game state
+    void setState(GameState gs) {
+        currGameState = gs;
+    }
+
+    // return the current game state
+    GameState getState() {
+	return currGameState;
+    }
+
+    // execute the current game state code
+    void execute() {
+        if(state is null) {
+            return;
+        }
+
+        state[currGameState].run();
+    }
+}

lesson#25 - Wrapping up the Game State Manager/ourGame/dub.json

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+{
+	"authors": [
+		"rillki"
+	],
+	"copyright": "no copyright",
+	"dependencies": {
+		"raylib-d2": "~>3.1.0"
+	},
+	"description": "2D game",
+	"libs": [
+		"raylib"
+	],
+	"license": "no license",
+	"name": "ourgame"
+}

lesson#25 - Wrapping up the Game State Manager/ourGame/dub.selections.json

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+{
+	"fileVersion": 1,
+	"versions": {
+		"ddmp": "0.0.1-0.dev.3",
+		"fluent-asserts": "0.13.3",
+		"libdparse": "0.14.0",
+		"raylib-d2": "3.1.0",
+		"stdx-allocator": "2.77.5"
+	}
+}

lesson#25 - Wrapping up the Game State Manager/ourGame/source/app.d

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+import data;
+import gstatemanager;
+
+import menu;
+import play;
+
+void main() {
+    // init
+    InitWindow(windowWidth, windowHeight, "Mission X");
+    scope(exit) { CloseWindow(); }
+
+    // set frames per second
+    SetTargetFPS(60);
+
+    // declaring and initializing menu and play states
+    Menu menu = new Menu();
+    Play play = new Play();
+
+    GStateManager.getInstance.setState(GameState.MainMenu);
+    
+    GStateManager.getInstance.add(menu, GameState.MainMenu);
+    GStateManager.getInstance.add(play, GameState.Play);
+    GStateManager.getInstance.add(null, GameState.Exit);
+
+    // outputs "*** menu state ***"
+    //GStateManager.getInstance.execute();
+
+    // change current state to play
+    //GStateManager.getInstance.setState(GameState.Play);
+
+    while(!WindowShouldClose() && GStateManager.getInstance.getState != GameState.Exit) {
+	GStateManager.getInstance.execute();
+    }
+
+    // outputs "*** play state ***"
+    //GStateManager.getInstance.execute();
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

lesson#25 - Wrapping up the Game State Manager/ourGame/source/data.d

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+module data;
+
+// mostly used libraries
+public import raylib;
+public import std.stdio: writeln, write;
+
+// window dimensions
+immutable windowWidth = 720;
+immutable windowHeight = 640;
+
+// Game states
+enum GameState {
+    MainMenu,
+    Play,
+    Exit
+}
+
+// state interface
+interface IState {
+    void run();
+}
+
+

lesson#25 - Wrapping up the Game State Manager/ourGame/source/gstatemanager.d

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+import data;
+
+class GStateManager {
+    // private class instance
+    private static GStateManager instance;
+    
+    // IState interface
+    private IState[GameState] state;
+    
+    // current game state 
+    private GameState currGameState;
+
+    // private constructor
+    private this() { }
+
+    // return the instance; create the instance, if it wasn't created yet
+    static GStateManager getInstance() {
+        if(instance is null) {
+            instance = new GStateManager();
+        }
+
+        return instance;
+    }
+
+    // add game state
+    void add(IState state, GameState gs) {
+	this.state[gs] = state;
+    }
+
+    // remove game state
+    void remove(GameState gs) {
+	this.state.remove(gs);
+    }
+
+    // set game state
+    void setState(GameState gs) {
+        currGameState = gs;
+    }
+
+    // return the current game state
+    GameState getState() {
+	return currGameState;
+    }
+
+    // execute the current game state code
+    void execute() {
+        if(state is null) {
+            return;
+        }
+
+        state[currGameState].run();
+    }
+}

lesson#25 - Wrapping up the Game State Manager/ourGame/source/menu.d

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+module menu;
+
+import data;
+import gstatemanager;
+
+class Menu: IState {
+    this() {}
+
+    // inherited from IState interface
+    void run() {
+	update();
+	processEvents();
+	render();
+    }
+
+    void update() {}
+
+    void processEvents() {
+	if(IsKeyPressed(KeyboardKey.KEY_P)) {
+	    GStateManager.getInstance.setState(GameState.Play);
+	}
+    }
+
+    void render() {
+	// enable drawing
+	BeginDrawing(); scope(exit) { EndDrawing(); }
+
+	// clear background
+	ClearBackground(Colors.GREEN);
+
+	// draw
+	// ...
+    }
+}

lesson#25 - Wrapping up the Game State Manager/ourGame/source/play.d

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+module play;
+
+import data;
+import gstatemanager;
+
+class Play: IState {
+    this() {}
+
+    // inherited from IState interface
+    void run() {
+	update();
+	processEvents();
+	render();
+    }
+    
+    void update() {}
+
+    void processEvents() {
+	if(IsKeyPressed(KeyboardKey.KEY_M)) {
+	    GStateManager.getInstance.setState(GameState.MainMenu);
+	}
+    }
+
+    void render() {
+	// enable drawing
+	BeginDrawing(); scope(exit) { EndDrawing(); }
+	
+	// clear background
+	ClearBackground(Colors.YELLOW);
+	
+	// draw
+	// ...
+    }
+}