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