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189 lines
4.3 KiB
189 lines
4.3 KiB
2 years ago
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<!-- Licensed under a BSD license. See license.html for license -->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>Three.js - Offscreen Canvas</title>
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<style>
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html, body {
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height: 100%;
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margin: 0;
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}
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#c {
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width: 100%;
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height: 100%;
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display: block;
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}
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#c:focus {
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outline: none;
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}
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</style>
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</head>
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<body>
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<canvas id="c" tabindex="1"></canvas>
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</body>
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<script type="module">
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import {init} from './shared-orbitcontrols.js';
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const mouseEventHandler = makeSendPropertiesHandler([
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'ctrlKey',
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'metaKey',
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'shiftKey',
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'button',
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'pointerType',
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'clientX',
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'clientY',
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'pageX',
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'pageY',
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]);
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const wheelEventHandlerImpl = makeSendPropertiesHandler([
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'deltaX',
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'deltaY',
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]);
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const keydownEventHandler = makeSendPropertiesHandler([
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'ctrlKey',
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'metaKey',
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'shiftKey',
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'keyCode',
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]);
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function wheelEventHandler(event, sendFn) {
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event.preventDefault();
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wheelEventHandlerImpl(event, sendFn);
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}
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function preventDefaultHandler(event) {
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event.preventDefault();
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}
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function copyProperties(src, properties, dst) {
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for (const name of properties) {
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dst[name] = src[name];
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}
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}
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function makeSendPropertiesHandler(properties) {
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return function sendProperties(event, sendFn) {
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const data = {type: event.type};
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copyProperties(event, properties, data);
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sendFn(data);
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};
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}
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function touchEventHandler(event, sendFn) {
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const touches = [];
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const data = {type: event.type, touches};
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for (let i = 0; i < event.touches.length; ++i) {
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const touch = event.touches[i];
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touches.push({
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pageX: touch.pageX,
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pageY: touch.pageY,
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});
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}
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sendFn(data);
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}
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// The four arrow keys
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const orbitKeys = {
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'37': true, // left
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'38': true, // up
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'39': true, // right
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'40': true, // down
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};
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function filteredKeydownEventHandler(event, sendFn) {
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const {keyCode} = event;
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if (orbitKeys[keyCode]) {
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event.preventDefault();
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keydownEventHandler(event, sendFn);
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}
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}
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let nextProxyId = 0;
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class ElementProxy {
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constructor(element, worker, eventHandlers) {
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this.id = nextProxyId++;
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this.worker = worker;
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const sendEvent = (data) => {
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this.worker.postMessage({
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type: 'event',
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id: this.id,
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data,
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});
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};
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// register an id
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worker.postMessage({
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type: 'makeProxy',
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id: this.id,
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});
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sendSize();
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for (const [eventName, handler] of Object.entries(eventHandlers)) {
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element.addEventListener(eventName, function(event) {
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handler(event, sendEvent);
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});
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}
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function sendSize() {
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const rect = element.getBoundingClientRect();
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sendEvent({
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type: 'size',
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left: rect.left,
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top: rect.top,
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width: element.clientWidth,
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height: element.clientHeight,
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});
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}
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// really need to use ResizeObserver
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window.addEventListener('resize', sendSize);
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}
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}
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function startWorker(canvas) {
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canvas.focus();
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const offscreen = canvas.transferControlToOffscreen();
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const worker = new Worker('offscreencanvas-worker-orbitcontrols.js', {type: 'module'});
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const eventHandlers = {
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contextmenu: preventDefaultHandler,
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mousedown: mouseEventHandler,
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mousemove: mouseEventHandler,
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mouseup: mouseEventHandler,
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pointerdown: mouseEventHandler,
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pointermove: mouseEventHandler,
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pointerup: mouseEventHandler,
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touchstart: touchEventHandler,
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touchmove: touchEventHandler,
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touchend: touchEventHandler,
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wheel: wheelEventHandler,
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keydown: filteredKeydownEventHandler,
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};
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const proxy = new ElementProxy(canvas, worker, eventHandlers);
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worker.postMessage({
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type: 'start',
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canvas: offscreen,
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canvasId: proxy.id,
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}, [offscreen]);
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console.log('using OffscreenCanvas'); /* eslint-disable-line no-console */
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}
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function startMainPage(canvas) {
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init({canvas, inputElement: canvas});
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console.log('using regular canvas'); /* eslint-disable-line no-console */
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}
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function main() { /* eslint consistent-return: 0 */
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const canvas = document.querySelector('#c');
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if (canvas.transferControlToOffscreen) {
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startWorker(canvas);
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} else {
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startMainPage(canvas);
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}
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}
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main();
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</script>
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</html>
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