magic-window.html - external/github.com/immersive-web/webxr-samples - 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'>

     <title>Magic Window</title>

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

     <script src='js/third-party/gl-matrix-min.js'></script>
     <script src='js/cottontail/build/cottontail.js'></script>

     <script src='js/webxr-button.js'></script>
   </head>
   <body>
     <header>
       <details open>
         <summary>Magic Window</summary>
         <p>
           This sample demonstrates use of a non-exclusive XRSession to present
           'Magic Window' content prior to entering XR presentation with an
           exclusive.
         </p>
       </details>
     </header>
     <script>
       (function () {
       'use strict';

       // XR globals.
       let xrButton = null;
       let xrExclusiveFrameOfRef = null;
       let xrNonExclusiveFrameOfRef = null;

       // WebGL scene globals.
       let gl = null;
       let renderer = null;
       let scene = new CubeSeaScene();

       function initXR() {
         xrButton = new XRDeviceButton({
           onRequestSession: onRequestSession,
           onEndSession: onEndSession
         });
         document.querySelector('header').appendChild(xrButton.domElement);

         if (navigator.xr) {
           navigator.xr.requestDevice().then((device) => {
             xrButton.setDevice(device);

             if (!device)
               return;

             // In order for a non-exclusive session to be used we must provide
             // an outputContext, which indicates the canvas that will contain
             // results of the session's rendering.
             let outputCanvas = document.createElement('canvas');
             let ctx = outputCanvas.getContext('xrpresent');

             // Pick an arbitrary device for the magic window content and start
             // up a non-exclusive session if possible.
             device.requestSession({ outputContext: ctx })
                 .then((session) => {
                   // Add the canvas to the document once we know that it will be
                   // rendered to.
                   document.body.appendChild(outputCanvas);
                   onSessionStarted(session);
                 });
           });
         }
       }

       function onRequestSession(device) {
         device.requestSession({ exclusive: true }).then((session) => {
           xrButton.setSession(session);
           onSessionStarted(session);
         });
       }

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

         if (!gl) {
           gl = createWebGLContext({
             compatibleXRDevice: session.device
           });

           renderer = new Renderer(gl);

           scene.setRenderer(renderer);
         }

         session.baseLayer = new XRWebGLLayer(session, gl);

         session.requestFrameOfReference('eyeLevel').then((frameOfRef) => {
           // Since we're dealing with multple sessions now we need to track
           // which XRFrameOfReference is associated with which XRSession.
           if (session.exclusive) {
             xrExclusiveFrameOfRef = frameOfRef;
           } else {
             xrNonExclusiveFrameOfRef = frameOfRef;
           }
           session.requestAnimationFrame(onXRFrame);
         });
       }

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

       function onSessionEnded(event) {
         // Only reset the button when the exclusive session ends.
         if (event.session.exclusive)
           xrButton.setSession(null);
       }

       // Called every time a XRSession requests that a new frame be drawn.
       function onXRFrame(t, frame) {
         let session = frame.session;
         // Ensure that we're using the right frame of reference for the session.
         let frameOfRef = session.exclusive ?
                          xrExclusiveFrameOfRef :
                          xrNonExclusiveFrameOfRef;
         let pose = frame.getDevicePose(frameOfRef);

         scene.startFrame();

         session.requestAnimationFrame(onXRFrame);

         gl.bindFramebuffer(gl.FRAMEBUFFER, session.baseLayer.framebuffer);
         gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

         if (pose) {
           for (let view of frame.views) {
             let viewport = view.getViewport(session.baseLayer);
             gl.viewport(viewport.x, viewport.y,
                         viewport.width, viewport.height);

             scene.draw(view.projectionMatrix, pose.getViewMatrix(view));
           }
         }

         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'>

	<title>Magic Window</title>

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

	<script src='js/third-party/gl-matrix-min.js'></script>
	<script src='js/cottontail/build/cottontail.js'></script>

	<script src='js/webxr-button.js'></script>
	</head>
	<body>
	<header>
	<details open>
	<summary>Magic Window</summary>
	<p>
	This sample demonstrates use of a non-exclusive XRSession to present
	'Magic Window' content prior to entering XR presentation with an
	exclusive.
	</p>
	</details>
	</header>
	<script>
	(function () {
	'use strict';

	// XR globals.
	let xrButton = null;
	let xrExclusiveFrameOfRef = null;
	let xrNonExclusiveFrameOfRef = null;

	// WebGL scene globals.
	let gl = null;
	let renderer = null;
	let scene = new CubeSeaScene();

	function initXR() {
	xrButton = new XRDeviceButton({
	onRequestSession: onRequestSession,
	onEndSession: onEndSession
	});
	document.querySelector('header').appendChild(xrButton.domElement);

	if (navigator.xr) {
	navigator.xr.requestDevice().then((device) => {
	xrButton.setDevice(device);

	if (!device)
	return;

	// In order for a non-exclusive session to be used we must provide
	// an outputContext, which indicates the canvas that will contain
	// results of the session's rendering.
	let outputCanvas = document.createElement('canvas');
	let ctx = outputCanvas.getContext('xrpresent');

	// Pick an arbitrary device for the magic window content and start
	// up a non-exclusive session if possible.
	device.requestSession({ outputContext: ctx })
	.then((session) => {
	// Add the canvas to the document once we know that it will be
	// rendered to.
	document.body.appendChild(outputCanvas);
	onSessionStarted(session);
	});
	});
	}
	}

	function onRequestSession(device) {
	device.requestSession({ exclusive: true }).then((session) => {
	xrButton.setSession(session);
	onSessionStarted(session);
	});
	}

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

	if (!gl) {
	gl = createWebGLContext({
	compatibleXRDevice: session.device
	});

	renderer = new Renderer(gl);

	scene.setRenderer(renderer);
	}

	session.baseLayer = new XRWebGLLayer(session, gl);

	session.requestFrameOfReference('eyeLevel').then((frameOfRef) => {
	// Since we're dealing with multple sessions now we need to track
	// which XRFrameOfReference is associated with which XRSession.
	if (session.exclusive) {
	xrExclusiveFrameOfRef = frameOfRef;
	} else {
	xrNonExclusiveFrameOfRef = frameOfRef;
	}
	session.requestAnimationFrame(onXRFrame);
	});
	}

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

	function onSessionEnded(event) {
	// Only reset the button when the exclusive session ends.
	if (event.session.exclusive)
	xrButton.setSession(null);
	}

	// Called every time a XRSession requests that a new frame be drawn.
	function onXRFrame(t, frame) {
	let session = frame.session;
	// Ensure that we're using the right frame of reference for the session.
	let frameOfRef = session.exclusive ?
	xrExclusiveFrameOfRef :
	xrNonExclusiveFrameOfRef;
	let pose = frame.getDevicePose(frameOfRef);

	scene.startFrame();

	session.requestAnimationFrame(onXRFrame);

	gl.bindFramebuffer(gl.FRAMEBUFFER, session.baseLayer.framebuffer);
	gl.clear(gl.COLOR_BUFFER_BIT \| gl.DEPTH_BUFFER_BIT);

	if (pose) {
	for (let view of frame.views) {
	let viewport = view.getViewport(session.baseLayer);
	gl.viewport(viewport.x, viewport.y,
	viewport.width, viewport.height);

	scene.draw(view.projectionMatrix, pose.getViewMatrix(view));
	}
	}

	scene.endFrame();
	}

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