feat: screen manager

src/nds.ts

@@ -1,5 +1,7 @@
 import * as THREE from "three";
 import { GLTFLoader } from "three/addons/loaders/GLTFLoader.js";
+import { ScreenManager } from "./screen-manager";
+import { HomeScreen } from "./screens/home-screen";
 
 const SCREEN_SOURCE_TEX_SIZE = 1024;
 const TOP_SCREEN_SOURCE_TEX_HEIGHT = SCREEN_SOURCE_TEX_SIZE / 404;
@@ -21,19 +23,23 @@ const createScreenCanvas = () => {
   return canvas;
 };
 
-type Screen = {
+type PhysicalScreen = {
   mesh: THREE.Mesh;
   canvas: HTMLCanvasElement;
   texture: THREE.CanvasTexture;
 };
 
 export class NDS extends THREE.Object3D {
-  private botScreen: Screen | null = null;
-  private topScreen: Screen | null = null;
+  private botScreen: PhysicalScreen | null = null;
+  private topScreen: PhysicalScreen | null = null;
+  private screenManager: ScreenManager;
 
   public constructor(camera: THREE.Camera, domElement: HTMLCanvasElement) {
     super();
 
+    // Initialize screen manager
+    this.screenManager = new ScreenManager(new HomeScreen());
+
     const loader = new GLTFLoader();
     // load model
     loader.load("/nintendo-ds/scene.gltf", ({ scene: model }) => {
@@ -101,10 +107,10 @@ export class NDS extends THREE.Object3D {
           emissiveIntensity: 0.5,
         });
 
-        this.botScreen = { mesh: topScreenMesh, canvas, texture };
+        this.botScreen = { mesh: botScreenMesh, canvas, texture };
       }
 
-      domElement.addEventListener("mousemove", (event) => {
+      domElement.addEventListener("click", (event) => {
         const rect = domElement.getBoundingClientRect();
 
         const raycaster = new THREE.Raycaster();
@@ -116,27 +122,17 @@ export class NDS extends THREE.Object3D {
           camera,
         );
 
-        const intersects = raycaster.intersectObjects([
-          topScreenMesh,
-          botScreenMesh,
-        ]);
+        const intersects = raycaster.intersectObject(botScreenMesh);
 
         if (intersects.length > 0) {
-          const intersection = intersects[0];
-          const mesh = intersection.object as THREE.Mesh;
-          const uv = intersection.uv;
-
+          const uv = intersects[0].uv;
           if (uv) {
             const x = Math.floor(uv.x * 256);
             const y = Math.floor(
-              mesh === topScreenMesh
-                ? uv.y * TOP_SCREEN_SOURCE_TEX_HEIGHT * 192
-                : // invert coords only for bottom screen
               192 - (1 - uv.y) * BOT_SCREEN_SOURCE_TEX_HEIGHT * 192,
             );
 
-            x;
-            y;
+            this.screenManager.handleTouch(x, y);
           }
         }
       });
@@ -146,10 +142,17 @@ export class NDS extends THREE.Object3D {
   }
 
   public update(): void {
-    if (this.topScreen) {
+    if (!this.topScreen || !this.botScreen) return;
+
+    {
+      const ctx = this.topScreen.canvas.getContext("2d")!;
+      this.screenManager.renderTop(ctx);
       this.topScreen.texture.needsUpdate = true;
     }
-    if (this.botScreen) {
+
+    {
+      const ctx = this.botScreen.canvas.getContext("2d")!;
+      this.screenManager.renderBottom(ctx);
       this.botScreen.texture.needsUpdate = true;
     }
   }

src/screen-manager.ts

@@ -0,0 +1,35 @@
+import type { Screen, ScreenContext } from "./screen";
+
+export class ScreenManager {
+  private currentScreen: Screen;
+  private context: ScreenContext;
+
+  constructor(initialScreen: Screen) {
+    this.currentScreen = initialScreen;
+    this.context = {
+      navigate: (screen: Screen) => {
+        this.currentScreen = screen;
+      },
+    };
+  }
+
+  renderTop(ctx: CanvasRenderingContext2D) {
+    ctx.clearRect(0, 0, 256, 192);
+    ctx.save();
+    this.currentScreen.renderTop(ctx);
+    ctx.restore();
+  }
+
+  renderBottom(ctx: CanvasRenderingContext2D) {
+    ctx.clearRect(0, 0, 256, 192);
+    ctx.save();
+    this.currentScreen.renderBottom(ctx);
+    ctx.restore();
+  }
+
+  handleTouch(x: number, y: number) {
+    if (this.currentScreen.handleTouch) {
+      this.currentScreen.handleTouch(x, y, this.context);
+    }
+  }
+}

src/screen.ts

@@ -0,0 +1,9 @@
+export interface ScreenContext {
+  navigate: (screen: Screen) => void;
+}
+
+export interface Screen {
+  renderTop(ctx: CanvasRenderingContext2D): void;
+  renderBottom(ctx: CanvasRenderingContext2D): void;
+  handleTouch?(x: number, y: number, context: ScreenContext): void;
+}

src/screens/contact-screen.ts

@@ -0,0 +1,25 @@
+import type { Screen, ScreenContext } from "../screen";
+import { HomeScreen } from "./home-screen";
+
+export class ContactScreen implements Screen {
+  renderTop(ctx: CanvasRenderingContext2D) {
+    ctx.fillStyle = "#ffffff";
+    ctx.font = "10px NDS10";
+    ctx.textBaseline = "top";
+    ctx.fillText("CONTACT", 1, 1);
+  }
+
+  renderBottom(ctx: CanvasRenderingContext2D) {
+    ctx.fillStyle = "#ffffff";
+    ctx.font = "10px NDS10";
+    ctx.textAlign = "left";
+    ctx.textBaseline = "bottom";
+    ctx.fillText("< Back", 1, 191);
+  }
+
+  handleTouch(x: number, y: number, context: ScreenContext): void {
+    if (x >= 0 && x <= 51 && y >= 178 && y <= 192) {
+      context.navigate(new HomeScreen());
+    }
+  }
+}

src/screens/home-screen.ts

@@ -0,0 +1,25 @@
+import type { Screen, ScreenContext } from "../screen";
+import { ContactScreen } from "./contact-screen";
+
+export class HomeScreen implements Screen {
+  renderTop(ctx: CanvasRenderingContext2D) {
+    ctx.fillStyle = "#ffffff";
+    ctx.font = "10px NDS10";
+    ctx.textBaseline = "top";
+    ctx.fillText("HOME", 1, 1);
+  }
+
+  renderBottom(ctx: CanvasRenderingContext2D) {
+    ctx.fillStyle = "#ffffff";
+    ctx.font = "10px NDS10";
+    ctx.textAlign = "right";
+    ctx.textBaseline = "bottom";
+    ctx.fillText("Contact >", 255, 191);
+  }
+
+  handleTouch(x: number, y: number, context: ScreenContext): void {
+    if (x >= 205 && x <= 256 && y >= 178 && y <= 192) {
+      context.navigate(new ContactScreen());
+    }
+  }
+}