ar-barebones.html - external/github.com/immersive-web/webxr-samples - Git at Google

 <!doctype html>
 <!--
 Copyright 2020 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'>
     <link rel='icon' type='image/png' sizes='32x32' href='favicon-32x32.png'>
     <link rel='icon' type='image/png' sizes='96x96' href='favicon-96x96.png'>
     <link rel='stylesheet' href='css/common.css'>

     <title>Barebones AR</title>
   </head>
   <body>
     <div id="overlay">
       <header>
         <details open>
           <summary>Barebones WebXR DOM Overlay</summary>
           <p>
             This sample demonstrates extremely simple use of an "immersive-ar"
             session with no library dependencies, with an optional DOM overlay.
             It doesn't render anything exciting, just draws a rectangle with a
             slowly changing color to prove it's working.
             <a class="back" href="./index.html">Back</a>
           </p>
           <div id="session-info"></div>
           <div id="pose"></div>
           <div id="warning-zone"></div>
           <button id="xr-button" class="barebones-button" disabled>XR not found</button>
         </details>
       </header>
     </div>
     <main style='text-align: center;'>
       <p>Click 'Enter AR' to see content</p>
     </main>
     <script type="module">
       // XR globals.
       let xrButton = document.getElementById('xr-button');
       let xrSession = null;
       let xrRefSpace = null;

       // WebGL scene globals.
       let gl = null;

       function checkSupportedState() {
         navigator.xr.isSessionSupported('immersive-ar').then((supported) => {
           if (supported) {
             xrButton.innerHTML = 'Enter AR';
           } else {
             xrButton.innerHTML = 'AR not found';
           }

           xrButton.disabled = !supported;
         });
       }

       function initXR() {
         if (!window.isSecureContext) {
           let message = "WebXR unavailable due to insecure context";
           document.getElementById("warning-zone").innerText = message;
         }

         if (navigator.xr) {
           xrButton.addEventListener('click', onButtonClicked);
           navigator.xr.addEventListener('devicechange', checkSupportedState);
           checkSupportedState();
         }
       }

       function onButtonClicked() {
         if (!xrSession) {
             // Ask for an optional DOM Overlay, see https://immersive-web.github.io/dom-overlays/
             navigator.xr.requestSession('immersive-ar', {
                 optionalFeatures: ['dom-overlay'],
                 domOverlay: {root: document.getElementById('overlay')}
             }).then(onSessionStarted, onRequestSessionError);
         } else {
           xrSession.end();
         }
       }

       function onSessionStarted(session) {
         xrSession = session;
         xrButton.innerHTML = 'Exit AR';

         // Show which type of DOM Overlay got enabled (if any)
         if (session.domOverlayState) {
           document.getElementById('session-info').innerHTML = 'DOM Overlay type: ' + session.domOverlayState.type;
         }

         session.addEventListener('end', onSessionEnded);
         let canvas = document.createElement('canvas');
         gl = canvas.getContext('webgl', {
           xrCompatible: true
         });
         session.updateRenderState({ baseLayer: new XRWebGLLayer(session, gl) });
         session.requestReferenceSpace('local').then((refSpace) => {
           xrRefSpace = refSpace;
           session.requestAnimationFrame(onXRFrame);
         });
       }

       function onRequestSessionError(ex) {
         alert("Failed to start immersive AR session.");
         console.error(ex.message);
       }

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

       function onSessionEnded(event) {
         xrSession = null;
         xrButton.innerHTML = 'Enter AR';
         document.getElementById('session-info').innerHTML = '';
         gl = null;
       }

       function onXRFrame(t, frame) {
         let session = frame.session;
         session.requestAnimationFrame(onXRFrame);

         gl.bindFramebuffer(gl.FRAMEBUFFER, session.renderState.baseLayer.framebuffer);

         // Update the clear color so that we can observe the color in the
         // headset changing over time. Use a scissor rectangle to keep the AR
         // scene visible.
         const width = session.renderState.baseLayer.framebufferWidth;
         const height = session.renderState.baseLayer.framebufferHeight;
         gl.enable(gl.SCISSOR_TEST);
         gl.scissor(width / 4, height / 4, width / 2, height / 2);
         let time = Date.now();
         gl.clearColor(Math.cos(time / 2000), Math.cos(time / 4000), Math.cos(time / 6000), 0.5);
         gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

         let pose = frame.getViewerPose(xrRefSpace);
         if (pose) {
           const p = pose.transform.position;
           document.getElementById('pose').innerText = "Position: " +
             p.x.toFixed(3) + ", " + p.y.toFixed(3) + ", " + p.z.toFixed(3);
         } else {
           document.getElementById('pose').innerText = "Position: (null pose)";
         }
       }

       initXR();
     </script>
   </body>
 </html>
	<!doctype html>
	<!--
	Copyright 2020 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'>
	<link rel='icon' type='image/png' sizes='32x32' href='favicon-32x32.png'>
	<link rel='icon' type='image/png' sizes='96x96' href='favicon-96x96.png'>
	<link rel='stylesheet' href='css/common.css'>

	<title>Barebones AR</title>
	</head>
	<body>
	<div id="overlay">
	<header>
	<details open>
	<summary>Barebones WebXR DOM Overlay</summary>
	<p>
	This sample demonstrates extremely simple use of an "immersive-ar"
	session with no library dependencies, with an optional DOM overlay.
	It doesn't render anything exciting, just draws a rectangle with a
	slowly changing color to prove it's working.
	<a class="back" href="./index.html">Back</a>
	</p>
	<div id="session-info"></div>
	<div id="pose"></div>
	<div id="warning-zone"></div>
	<button id="xr-button" class="barebones-button" disabled>XR not found</button>
	</details>
	</header>
	</div>
	<main style='text-align: center;'>
	<p>Click 'Enter AR' to see content</p>
	</main>
	<script type="module">
	// XR globals.
	let xrButton = document.getElementById('xr-button');
	let xrSession = null;
	let xrRefSpace = null;

	// WebGL scene globals.
	let gl = null;

	function checkSupportedState() {
	navigator.xr.isSessionSupported('immersive-ar').then((supported) => {
	if (supported) {
	xrButton.innerHTML = 'Enter AR';
	} else {
	xrButton.innerHTML = 'AR not found';
	}

	xrButton.disabled = !supported;
	});
	}

	function initXR() {
	if (!window.isSecureContext) {
	let message = "WebXR unavailable due to insecure context";
	document.getElementById("warning-zone").innerText = message;
	}

	if (navigator.xr) {
	xrButton.addEventListener('click', onButtonClicked);
	navigator.xr.addEventListener('devicechange', checkSupportedState);
	checkSupportedState();
	}
	}

	function onButtonClicked() {
	if (!xrSession) {
	// Ask for an optional DOM Overlay, see https://immersive-web.github.io/dom-overlays/
	navigator.xr.requestSession('immersive-ar', {
	optionalFeatures: ['dom-overlay'],
	domOverlay: {root: document.getElementById('overlay')}
	}).then(onSessionStarted, onRequestSessionError);
	} else {
	xrSession.end();
	}
	}

	function onSessionStarted(session) {
	xrSession = session;
	xrButton.innerHTML = 'Exit AR';

	// Show which type of DOM Overlay got enabled (if any)
	if (session.domOverlayState) {
	document.getElementById('session-info').innerHTML = 'DOM Overlay type: ' + session.domOverlayState.type;
	}

	session.addEventListener('end', onSessionEnded);
	let canvas = document.createElement('canvas');
	gl = canvas.getContext('webgl', {
	xrCompatible: true
	});
	session.updateRenderState({ baseLayer: new XRWebGLLayer(session, gl) });
	session.requestReferenceSpace('local').then((refSpace) => {
	xrRefSpace = refSpace;
	session.requestAnimationFrame(onXRFrame);
	});
	}

	function onRequestSessionError(ex) {
	alert("Failed to start immersive AR session.");
	console.error(ex.message);
	}

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

	function onSessionEnded(event) {
	xrSession = null;
	xrButton.innerHTML = 'Enter AR';
	document.getElementById('session-info').innerHTML = '';
	gl = null;
	}

	function onXRFrame(t, frame) {
	let session = frame.session;
	session.requestAnimationFrame(onXRFrame);

	gl.bindFramebuffer(gl.FRAMEBUFFER, session.renderState.baseLayer.framebuffer);

	// Update the clear color so that we can observe the color in the
	// headset changing over time. Use a scissor rectangle to keep the AR
	// scene visible.
	const width = session.renderState.baseLayer.framebufferWidth;
	const height = session.renderState.baseLayer.framebufferHeight;
	gl.enable(gl.SCISSOR_TEST);
	gl.scissor(width / 4, height / 4, width / 2, height / 2);
	let time = Date.now();
	gl.clearColor(Math.cos(time / 2000), Math.cos(time / 4000), Math.cos(time / 6000), 0.5);
	gl.clear(gl.COLOR_BUFFER_BIT \| gl.DEPTH_BUFFER_BIT);

	let pose = frame.getViewerPose(xrRefSpace);
	if (pose) {
	const p = pose.transform.position;
	document.getElementById('pose').innerText = "Position: " +
	p.x.toFixed(3) + ", " + p.y.toFixed(3) + ", " + p.z.toFixed(3);
	} else {
	document.getElementById('pose').innerText = "Position: (null pose)";
	}
	}

	initXR();
	</script>
	</body>
	</html>