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In this example, you will learn how to use emulators with three.js renderer. We will create a rotating cube with a digger game.

threejs.jpg

First, you need to include emulators.js:

<script src="https://v8.js-dos.com/latest/emulators/emulators.js"></script>
<script src="https://v8.js-dos.com/v7/emulators/emulators.js"></script> <script src="https://v8.js-dos.com/v7/emulators-ui/emulators-ui.js"></script>

Then set emulators.pathPrefix pointing to the correct location:

<script type="module"> emulators.pathPrefix = "https://v8.js-dos.com/latest/emulators/";
<script type="module"> emulators.pathPrefix = "https://v8.js-dos.com/v7/emulators/";

Then you need to download js-dos bundle (for example, Digger game), and instantiate emulators:

const bundle = await fetch("https://cdn.dos.zone/original/2X/9/9ed7eb9c2c441f56656692ed4dc7ab28f58503ce.jsdos"); const ci = await emulators.dosWorker(new Uint8Array(await bundle.arrayBuffer()));

Now the DOS program is started in worker, and we need to render it on the screen. To do this, we need to subscribe to frame event and update texture:

const rgba = new Uint8ClampedArray(320 * 200 * 4); ci.events().onFrame((rgb) => { for (let next = 0; next < 320 * 200; ++next) { rgba[next * 4 + 0] = rgb[next * 3 + 0]; rgba[next * 4 + 1] = rgb[next * 3 + 1]; rgba[next * 4 + 2] = rgb[next * 3 + 2]; rgba[next * 4 + 3] = 255; } ctx?.putImageData(new ImageData(rgba, 320, 200), 0, 0); // ... }

Where rgb is an actual DOS screen frame.

<!doctype html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" /> <title>Digger Example</title> <script src="https://v8.js-dos.com/latest/emulators/emulators.js"></script> <style> html, body, #root { width: 100%; height: 100%; padding: 0; margin: 0; overflow: hidden; } </style> </head> <body> <div id="root"> </div> <script type="module"> import * as THREE from 'https://unpkg.com/three@latest/build/three.module.js'; emulators.pathPrefix = "https://v8.js-dos.com/latest/emulators/"; const img = document.createElement("canvas"); img.width = 320; img.height = 200; const ctx = img.getContext('2d'); const texture = new THREE.CanvasTexture(img); const scene = new THREE.Scene(); scene.background = new THREE.Color(); const camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 ); const renderer = new THREE.WebGLRenderer(); renderer.setSize( window.innerWidth, window.innerHeight ); document.getElementById("root").appendChild(renderer.domElement); const geometry = new THREE.BoxGeometry(); const material = new THREE.MeshBasicMaterial({ map: texture, }); const cube = new THREE.Mesh( geometry, material ); scene.add( cube ); camera.position.z = 2; const animate = function () { requestAnimationFrame( animate ); cube.rotation.x += 0.01; cube.rotation.y += 0.01; renderer.render( scene, camera ); }; animate(); async function runDigger() { stop(); const bundle = await fetch("https://cdn.dos.zone/original/2X/9/9ed7eb9c2c441f56656692ed4dc7ab28f58503ce.jsdos"); const ci = await emulators.dosWorker(new Uint8Array(await bundle.arrayBuffer())); const rgba = new Uint8ClampedArray(320 * 200 * 4); ci.events().onFrame((rgb, _rgba) => { for (let next = 0; next < 320 * 200; ++next) { rgba[next * 4 + 0] = rgb[next * 3 + 0]; rgba[next * 4 + 1] = rgb[next * 3 + 1]; rgba[next * 4 + 2] = rgb[next * 3 + 2]; rgba[next * 4 + 3] = 255; } ctx?.putImageData(new ImageData(rgba, 320, 200), 0, 0); texture.needsUpdate = true; }); } runDigger(); </script> </body> </html>
Last modified: 21 июня 2024