Singleton Design Patter

lesson#22 - Singleton design pattern/ourGame/dub.json

@@ -4,10 +4,12 @@
 	],
 	"copyright": "no copyright",
 	"dependencies": {
-		"raylib-d": "~>3.0.2"
+		"raylib-d": "~>3.0.3"
 	},
-	"libs": [ "raylib"  ], 
-	"description": "2D game with roguelike elements",
+	"description": "2D game",
+	"libs": [
+		"raylib"
+	],
 	"license": "no license",
 	"name": "ourgame"
 }

lesson#22 - Singleton design pattern/ourGame/dub.selections.json

@@ -0,0 +1,10 @@
+{
+	"fileVersion": 1,
+	"versions": {
+		"ddmp": "0.0.1-0.dev.3",
+		"fluent-asserts": "0.13.3",
+		"libdparse": "0.14.0",
+		"raylib-d": "3.0.3",
+		"stdx-allocator": "2.77.5"
+	}
+}

lesson#22 - Singleton design pattern/ourGame/source/app.d

@@ -1,6 +1,25 @@
-import std.stdio;
+import data;
+import gstatemanager;
 
-void main()
-{
-	writeln("Edit source/app.d to start your project.");
+void main() {
+	// init
+    InitWindow(windowWidth, windowHeight, "Mission X");
+    scope(exit) CloseWindow();
+
+	// set frames per second
+    SetTargetFPS(60);
+
+    while(!WindowShouldClose()) {
+        // process events
+
+        // update
+		GStateManager.getInstance().hello_world();
+
+        // render
+        BeginDrawing();
+		scope(exit) EndDrawing();
+
+        ClearBackground(Colors.WHITE);
+		// .. draw ..
+    }
 }

lesson#22 - Singleton design pattern/ourGame/source/data.d

@@ -0,0 +1,7 @@
+module data;
+
+public import raylib;
+public import std.stdio: writeln, write;
+
+immutable windowWidth = 720;
+immutable windowHeight = 640;

lesson#22 - Singleton design pattern/ourGame/source/gstatemanager.d

@@ -0,0 +1,19 @@
+import data;
+
+class GStateManager {
+    private static GStateManager instance;
+
+    private this() {}
+
+    static GStateManager getInstance() {
+        if(instance is null) {
+            instance = new GStateManager();
+        }
+
+        return instance;
+    }
+
+    void hello_world() {
+        writeln("Hello World!");
+    }
+}