third_party/webxr_test_pages/webxr-samples/tests/offscreen-canvas.html - chromium/src - Git at Google

 <!doctype html>
 <!--
 Copyright 2018 The Immersive Web Community Group

 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in
 the Software without restriction, including without limitation the rights to
 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 the Software, and to permit persons to whom the Software is furnished to do so,
 subject to the following conditions:

 The above copyright notice and this permission notice shall be included in all
 copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 -->
 <html>
   <head>
     <meta charset='utf-8'>
     <meta name='viewport' content='width=device-width, initial-scale=1, user-scalable=no'>
     <meta name='mobile-web-app-capable' content='yes'>
     <meta name='apple-mobile-web-app-capable' content='yes'>

     <!-- Origin Trial Token, feature = WebXR Device API, origin = https://immersive-web.github.io, expires = 2018-08-28 -->
 <meta http-equiv="origin-trial" data-feature="WebXR Device API" data-expires="2018-08-28" content="AnNpu7ceXvLew05ccD8Zr1OZsdZiB2hLQKK82kTTMDwF7oRKtP3QEJ4RzkeHrmB8Sq0vSV6ZNmszpBCZ0I8p9gAAAABceyJvcmlnaW4iOiJodHRwczovL2ltbWVyc2l2ZS13ZWIuZ2l0aHViLmlvOjQ0MyIsImZlYXR1cmUiOiJXZWJYUkRldmljZSIsImV4cGlyeSI6MTUzNTQxNDQwMH0=">

     <title>Offscreen Canvas</title>

     <link href='../css/common.css' rel='stylesheet'></link>

     <!--The polyfill is not needed for browser that have native API support,
         but is linked by these samples for wider compatibility.-->
     <!--script src='https://cdn.jsdelivr.net/npm/webxr-polyfill@latest/build/webxr-polyfill.js'></script-->
     <script src='../js/webxr-polyfill.js'></script>

     <script src='../js/third-party/dat.gui/dat.gui.min.js'></script>

     <script src='../js/webxr-button.js'></script>
   </head>
   <body>
     <header>
       <details id='details-panel' open>
         <summary>Offscreen Canvas</summary>
         <p>
           A simple test to ensure that the browser's WebXR implementation works with a WebGL context created
           from an OffscreenCanvas.
           <a class="back" href="./">Back</a>
         </p>
       </details>
     </header>
    <script type="module">
       import {Scene} from '../js/cottontail/src/scenes/scene.js';
       import {Renderer, createWebGLContext} from '../js/cottontail/src/core/renderer.js';
       import {Gltf2Node} from '../js/cottontail/src/nodes/gltf2.js';
       import {QueryArgs} from '../js/cottontail/src/util/query-args.js';
       import {SkyboxNode} from '../js/cottontail/src/nodes/skybox.js';

       // If requested, initialize the WebXR polyfill
       if (QueryArgs.getBool('allowPolyfill', false)) {
         var polyfill = new WebXRPolyfill();
       }

       // XR globals.
       let xrButton = null;
       let xrImmersiveRefSpace = null;
       let xrNonImmersiveRefSpace = null;

       // WebGL scene globals.
       let gl = null;
       let renderer = null;
       let scene = new Scene();
       scene.addNode(new Gltf2Node({url: '../../media/gltf/space/space.gltf'}));
       scene.addNode(new SkyboxNode({url: '../../media/textures/milky-way-4k.png'}));

       function initXR() {
         xrButton = new XRDeviceButton({
           onRequestSession: onRequestSession,
           onEndSession: onEndSession,
           supportedSessionTypes: ['immersive-vr']
         });
         document.querySelector('header').appendChild(xrButton.domElement);

         if (navigator.xr) {
           navigator.xr.requestSession('inline').then(onSessionStarted);
         }
       }

       function initGL() {
         if (gl)
           return;

         let offscreenCanvas = new OffscreenCanvas(16, 16);
         gl = offscreenCanvas.getContext('webgl', {
           xrCompatible: true
         });

         renderer = new Renderer(gl);
         scene.setRenderer(renderer);
         scene.inputRenderer.setControllerMesh(new Gltf2Node({url: '../../media/gltf/controller/controller.gltf'}));
       }

       function onRequestSession() {
         navigator.xr.requestSession('immersive-vr').then((session) => {
           xrButton.setSession(session);
           onSessionStarted(session);
         });
       }

       function onSessionStarted(session) {
         session.addEventListener('end', onSessionEnded);

         initGL();

         let outputCanvas = document.createElement('canvas');
         document.body.appendChild(outputCanvas);

         session.updateRenderState({
             baseLayer: new XRWebGLLayer(session, gl),
             outputContext: outputCanvas.getContext('xrpresent')
         });

         session.requestReferenceSpace({ type: 'stationary', subtype: 'eye-level' }).then((refSpace) => {
           return refSpace;
         }, (e) => {
           if (!session.mode.startsWith('immersive')) {
             // If we're in inline mode, our underlying platform may not support
             // the stationary reference space, but an identity space is guaranteed.
             return session.requestReferenceSpace({ type: 'identity' });
           } else {
             throw e;
           }
         }).then((refSpace) => {
           if (session.mode.startsWith('immersive')) {
             xrImmersiveRefSpace = refSpace;
           } else {
             xrNonImmersiveRefSpace = refSpace;
           }
           session.requestAnimationFrame(onXRFrame);
         });
       }

       function onEndSession(session) {
         session.end();
       }

       function onSessionEnded(event) {
         if (event.session.mode.startsWith('immersive')) {
           xrButton.setSession(null);
         }

         if (event.session.renderState.outputContext) {
           document.body.removeChild(event.session.renderState.outputContext.canvas);
         }
       }

       function onXRFrame(t, frame) {
         let session = frame.session;
         let refSpace = session.mode.startsWith('immersive') ?
                          xrImmersiveRefSpace :
                          xrNonImmersiveRefSpace;
         let pose = frame.getViewerPose(refSpace);

         scene.startFrame();

         session.requestAnimationFrame(onXRFrame);

         scene.updateInputSources(frame, refSpace);

         scene.drawXRFrame(frame, pose);

         scene.endFrame();
       }

       // Start the XR application.
       initXR();
     </script>
   </body>
 </html>
	<!doctype html>
	<!--
	Copyright 2018 The Immersive Web Community Group

	Permission is hereby granted, free of charge, to any person obtaining a copy of
	this software and associated documentation files (the "Software"), to deal in
	the Software without restriction, including without limitation the rights to
	use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
	the Software, and to permit persons to whom the Software is furnished to do so,
	subject to the following conditions:

	The above copyright notice and this permission notice shall be included in all
	copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
	FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
	COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
	IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	-->
	<html>
	<head>
	<meta charset='utf-8'>
	<meta name='viewport' content='width=device-width, initial-scale=1, user-scalable=no'>
	<meta name='mobile-web-app-capable' content='yes'>
	<meta name='apple-mobile-web-app-capable' content='yes'>

	<!-- Origin Trial Token, feature = WebXR Device API, origin = https://immersive-web.github.io, expires = 2018-08-28 -->
	<meta http-equiv="origin-trial" data-feature="WebXR Device API" data-expires="2018-08-28" content="AnNpu7ceXvLew05ccD8Zr1OZsdZiB2hLQKK82kTTMDwF7oRKtP3QEJ4RzkeHrmB8Sq0vSV6ZNmszpBCZ0I8p9gAAAABceyJvcmlnaW4iOiJodHRwczovL2ltbWVyc2l2ZS13ZWIuZ2l0aHViLmlvOjQ0MyIsImZlYXR1cmUiOiJXZWJYUkRldmljZSIsImV4cGlyeSI6MTUzNTQxNDQwMH0=">

	<title>Offscreen Canvas</title>

	<link href='../css/common.css' rel='stylesheet'></link>

	<!--The polyfill is not needed for browser that have native API support,
	but is linked by these samples for wider compatibility.-->
	<!--script src='https://cdn.jsdelivr.net/npm/webxr-polyfill@latest/build/webxr-polyfill.js'></script-->
	<script src='../js/webxr-polyfill.js'></script>

	<script src='../js/third-party/dat.gui/dat.gui.min.js'></script>

	<script src='../js/webxr-button.js'></script>
	</head>
	<body>
	<header>
	<details id='details-panel' open>
	<summary>Offscreen Canvas</summary>
	<p>
	A simple test to ensure that the browser's WebXR implementation works with a WebGL context created
	from an OffscreenCanvas.
	<a class="back" href="./">Back</a>
	</p>
	</details>
	</header>
	<script type="module">
	import {Scene} from '../js/cottontail/src/scenes/scene.js';
	import {Renderer, createWebGLContext} from '../js/cottontail/src/core/renderer.js';
	import {Gltf2Node} from '../js/cottontail/src/nodes/gltf2.js';
	import {QueryArgs} from '../js/cottontail/src/util/query-args.js';
	import {SkyboxNode} from '../js/cottontail/src/nodes/skybox.js';

	// If requested, initialize the WebXR polyfill
	if (QueryArgs.getBool('allowPolyfill', false)) {
	var polyfill = new WebXRPolyfill();
	}

	// XR globals.
	let xrButton = null;
	let xrImmersiveRefSpace = null;
	let xrNonImmersiveRefSpace = null;

	// WebGL scene globals.
	let gl = null;
	let renderer = null;
	let scene = new Scene();
	scene.addNode(new Gltf2Node({url: '../../media/gltf/space/space.gltf'}));
	scene.addNode(new SkyboxNode({url: '../../media/textures/milky-way-4k.png'}));

	function initXR() {
	xrButton = new XRDeviceButton({
	onRequestSession: onRequestSession,
	onEndSession: onEndSession,
	supportedSessionTypes: ['immersive-vr']
	});
	document.querySelector('header').appendChild(xrButton.domElement);

	if (navigator.xr) {
	navigator.xr.requestSession('inline').then(onSessionStarted);
	}
	}

	function initGL() {
	if (gl)
	return;

	let offscreenCanvas = new OffscreenCanvas(16, 16);
	gl = offscreenCanvas.getContext('webgl', {
	xrCompatible: true
	});

	renderer = new Renderer(gl);
	scene.setRenderer(renderer);
	scene.inputRenderer.setControllerMesh(new Gltf2Node({url: '../../media/gltf/controller/controller.gltf'}));
	}

	function onRequestSession() {
	navigator.xr.requestSession('immersive-vr').then((session) => {
	xrButton.setSession(session);
	onSessionStarted(session);
	});
	}

	function onSessionStarted(session) {
	session.addEventListener('end', onSessionEnded);

	initGL();

	let outputCanvas = document.createElement('canvas');
	document.body.appendChild(outputCanvas);

	session.updateRenderState({
	baseLayer: new XRWebGLLayer(session, gl),
	outputContext: outputCanvas.getContext('xrpresent')
	});

	session.requestReferenceSpace({ type: 'stationary', subtype: 'eye-level' }).then((refSpace) => {
	return refSpace;
	}, (e) => {
	if (!session.mode.startsWith('immersive')) {
	// If we're in inline mode, our underlying platform may not support
	// the stationary reference space, but an identity space is guaranteed.
	return session.requestReferenceSpace({ type: 'identity' });
	} else {
	throw e;
	}
	}).then((refSpace) => {
	if (session.mode.startsWith('immersive')) {
	xrImmersiveRefSpace = refSpace;
	} else {
	xrNonImmersiveRefSpace = refSpace;
	}
	session.requestAnimationFrame(onXRFrame);
	});
	}

	function onEndSession(session) {
	session.end();
	}

	function onSessionEnded(event) {
	if (event.session.mode.startsWith('immersive')) {
	xrButton.setSession(null);
	}

	if (event.session.renderState.outputContext) {
	document.body.removeChild(event.session.renderState.outputContext.canvas);
	}
	}

	function onXRFrame(t, frame) {
	let session = frame.session;
	let refSpace = session.mode.startsWith('immersive') ?
	xrImmersiveRefSpace :
	xrNonImmersiveRefSpace;
	let pose = frame.getViewerPose(refSpace);

	scene.startFrame();

	session.requestAnimationFrame(onXRFrame);

	scene.updateInputSources(frame, refSpace);

	scene.drawXRFrame(frame, pose);

	scene.endFrame();
	}

	// Start the XR application.
	initXR();
	</script>
	</body>
	</html>