third_party/webxr_test_pages/webxr-samples/viewport-scaling.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>Viewport Scaling</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/webxr-button.js'></script>
   </head>
   <body>
     <header>
       <details open>
         <summary>Viewport Scaling</summary>
         <p>
           This sample demonstrates scaling the viewports used for a WebXR layer
           at runtime to dynamically adjust the fillrate required and improve
           performance or quality as needed.

           Viewport scaling should be used to make a performance/quality tradeoff
           in response to realtime performance monitoring.
           <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 {FallbackHelper} from './js/cottontail/src/util/fallback-helper.js';
       import {CubeSeaNode} from './js/cottontail/src/nodes/cube-sea.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 CubeSeaNode());

       let resolutionMultiplier = 1.0;
       let lastAdjustment = Date.now()-1000;

       // Called in the render loop.
       function adjustViewportScale(session) {
         // Update the viewport scale every tenth of a second.
         let t = Date.now();
         if (t - lastAdjustment < 100)
           return;
         lastAdjustment = t;

         // Modify the scale over time on a sin wave. In the real world this
         // would probably be based on scene complexity.
         // Oscillates between 1.0 to 0.5.
         resolutionMultiplier = (Math.sin(t / 1000) * 0.25) + 0.75;

         // This is the only new XRSession call in this sample. It sets a
         // requested scale to be applied to the viewports reported for each
         // XRView. The UA is allowed to ignore the request or adjust it as
         // needed. If the scaling request is honored it will take effect on the
         // *next* frame, not the current one.
         session.renderState.baseLayer.requestViewportScaling(resolutionMultiplier);
       }

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

         if (navigator.xr) {
           navigator.xr.supportsSessionMode('immersive-vr').then(() => {
             xrButton.enabled = true;
           });

           navigator.xr.requestSession().then(onSessionStarted);
         } else {
           initFallback();
         }
       }

       function initFallback() {
         initGL();
         document.body.appendChild(gl.canvas);
         let fallbackHelper = new FallbackHelper(scene, gl);
       }

       function initGL() {
         if (gl)
           return;

         gl = createWebGLContext({
           xrCompatible: true
         });

         gl.clearColor(0.1, 0.2, 0.3, 1.0);

         renderer = new Renderer(gl);

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

       function onRequestSession() {
         navigator.xr.requestSession({ mode: '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) => {
           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();

         // Adjust the viewports if needed.
         adjustViewportScale(session);

         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>Viewport Scaling</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/webxr-button.js'></script>
	</head>
	<body>
	<header>
	<details open>
	<summary>Viewport Scaling</summary>
	<p>
	This sample demonstrates scaling the viewports used for a WebXR layer
	at runtime to dynamically adjust the fillrate required and improve
	performance or quality as needed.

	Viewport scaling should be used to make a performance/quality tradeoff
	in response to realtime performance monitoring.
	<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 {FallbackHelper} from './js/cottontail/src/util/fallback-helper.js';
	import {CubeSeaNode} from './js/cottontail/src/nodes/cube-sea.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 CubeSeaNode());

	let resolutionMultiplier = 1.0;
	let lastAdjustment = Date.now()-1000;

	// Called in the render loop.
	function adjustViewportScale(session) {
	// Update the viewport scale every tenth of a second.
	let t = Date.now();
	if (t - lastAdjustment < 100)
	return;
	lastAdjustment = t;

	// Modify the scale over time on a sin wave. In the real world this
	// would probably be based on scene complexity.
	// Oscillates between 1.0 to 0.5.
	resolutionMultiplier = (Math.sin(t / 1000) * 0.25) + 0.75;

	// This is the only new XRSession call in this sample. It sets a
	// requested scale to be applied to the viewports reported for each
	// XRView. The UA is allowed to ignore the request or adjust it as
	// needed. If the scaling request is honored it will take effect on the
	// next frame, not the current one.
	session.renderState.baseLayer.requestViewportScaling(resolutionMultiplier);
	}

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

	if (navigator.xr) {
	navigator.xr.supportsSessionMode('immersive-vr').then(() => {
	xrButton.enabled = true;
	});

	navigator.xr.requestSession().then(onSessionStarted);
	} else {
	initFallback();
	}
	}

	function initFallback() {
	initGL();
	document.body.appendChild(gl.canvas);
	let fallbackHelper = new FallbackHelper(scene, gl);
	}

	function initGL() {
	if (gl)
	return;

	gl = createWebGLContext({
	xrCompatible: true
	});

	gl.clearColor(0.1, 0.2, 0.3, 1.0);

	renderer = new Renderer(gl);

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

	function onRequestSession() {
	navigator.xr.requestSession({ mode: '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) => {
	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();

	// Adjust the viewports if needed.
	adjustViewportScale(session);

	session.requestAnimationFrame(onXRFrame);

	scene.updateInputSources(frame, refSpace);

	scene.drawXRFrame(frame, pose);

	scene.endFrame();
	}

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