viewport-scaling.html - external/github.com/immersive-web/webxr-samples - Git at Google

 <!doctype html>
 <!--
 Copyright 2024 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>Immersive Viewport scaling</title>
   </head>
   <body>
     <header>
       <details open>
         <summary>Viewport scaling</summary>
         <p>
           This sample demonstrates how a session can request to render to
           a smaller area of its layer. This can be used to dynamically
           lower the number of pixels that need to be rendered. This can
           help experiences that are fragment bound for a short amount
           of time.
           <a class="back" href="./">Back</a>
           <br/>
           Use projection layer: <input id='useLayer' type='checkbox'/>
         </p>
       </details>
     </header>
     <main style='text-align: center;'>
       <p>Click 'Enter XR' to see content</p>
     </main>
     <script type="module">
       import {WebXRButton} from './js/util/webxr-button.js';
       import {Scene, WebXRView} from './js/render/scenes/scene.js';
       import {Renderer, createWebGLContext} from './js/render/core/renderer.js';
       import {Gltf2Node} from './js/render/nodes/gltf2.js';
       import {SkyboxNode} from './js/render/nodes/skybox.js';
       import {QueryArgs} from './js/util/query-args.js';

       import WebXRPolyfill from './js/third-party/webxr-polyfill/build/webxr-polyfill.module.js';
       if (QueryArgs.getBool('usePolyfill', true)) {
         let polyfill = new WebXRPolyfill();
       }

       // XR globals.
       let xrButton = null;
       let xrRefSpace = null;

       // WebGL scene globals.
       let gl = null;
       let renderer = null;
       let scene = new Scene();
       let scale = 1;
       let scale_down = true;
       let useLayerCheckbox = document.getElementById('useLayer');
       let useLayer = false;
       // layer support
       let xrGLFactory = null;
       let xrFramebuffer = null;
       let proj_layer = null;
       let count = true;

       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 WebXRButton({
           onRequestSession: onRequestSession,
           onEndSession: onEndSession
         });
         document.querySelector('header').appendChild(xrButton.domElement);

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

       function onRequestSession() {
         useLayer = useLayerCheckbox.checked;
         return navigator.xr.requestSession('immersive-vr', {
           requiredFeatures: useLayer?['layers']:[],
         }).then(onSessionStarted);
       }

       function onSessionStarted(session) {
         xrButton.setSession(session);

         session.addEventListener('end', onSessionEnded);

         gl = createWebGLContext({
           xrCompatible: true, webgl2: true
         });

         renderer = new Renderer(gl);

         scene.setRenderer(renderer);

         if (useLayer) {
             xrFramebuffer = gl.createFramebuffer();
             xrGLFactory = new XRWebGLBinding(session, gl);
         } else {
             let gllayer = new XRWebGLLayer(session, gl);
             gllayer.fixedFoveation = 1.0;
             session.updateRenderState({ baseLayer: gllayer });
         }

         session.requestReferenceSpace('local').then((refSpace) => {
           xrRefSpace = refSpace;

           if (useLayer) {
             proj_layer = xrGLFactory.createProjectionLayer({ stencil: false });
             proj_layer.fixedFoveation = 1;
             session.updateRenderState({ layers: [proj_layer] });
           }
           session.requestAnimationFrame(onXRFrame);
         });

         session.onselectstart = () => {
           count = false;
         }
         session.onselectend = () => {
           count = true;
         }
       }

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

       function onSessionEnded(event) {
         xrButton.setSession(null);

         renderer = null;
       }

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

         scene.startFrame();
         scene.updateInputSources(frame, xrRefSpace);

         session.requestAnimationFrame(onXRFrame);

         let pose = frame.getViewerPose(xrRefSpace);

         if (pose) {
           if (useLayer) {
             let views = [];
             for (let view of pose.views) {
                 view.requestViewportScale(scale);
                 let subImage = xrGLFactory.getViewSubImage(proj_layer, view);
                 subImage.framebuffer = xrFramebuffer;
                 let viewport = subImage.viewport;
                 gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);
                 gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, subImage.colorTexture, 0);
                 gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.TEXTURE_2D, subImage.depthStencilTexture, 0);

                 views.push(new WebXRView(view, subImage, viewport));
             }
             scene.drawViewArray(views);
           } else {
             let glLayer = session.renderState.baseLayer;

             gl.bindFramebuffer(gl.FRAMEBUFFER, glLayer.framebuffer);

             gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

             for (let view of pose.views) {
                 view.requestViewportScale(scale);

                 let viewport = glLayer.getViewport(view);
                 gl.viewport(viewport.x, viewport.y,
                             viewport.width, viewport.height);

                 scene.draw(view.projectionMatrix, view.transform);
             }
           }

           if (count)
             scale += scale_down ? -0.004 : 0.004;

           if (scale >= 1) {
             scale = 1;
             scale_down = true;
           } else if (scale <= 0.125) {
             scale = 0.125;
             scale_down = false;
           }
         }

         scene.endFrame();
       }

       initXR();
     </script>
   </body>
 </html>
	<!doctype html>
	<!--
	Copyright 2024 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>Immersive Viewport scaling</title>
	</head>
	<body>
	<header>
	<details open>
	<summary>Viewport scaling</summary>
	<p>
	This sample demonstrates how a session can request to render to
	a smaller area of its layer. This can be used to dynamically
	lower the number of pixels that need to be rendered. This can
	help experiences that are fragment bound for a short amount
	of time.
	<a class="back" href="./">Back</a>
	<br/>
	Use projection layer: <input id='useLayer' type='checkbox'/>
	</p>
	</details>
	</header>
	<main style='text-align: center;'>
	<p>Click 'Enter XR' to see content</p>
	</main>
	<script type="module">
	import {WebXRButton} from './js/util/webxr-button.js';
	import {Scene, WebXRView} from './js/render/scenes/scene.js';
	import {Renderer, createWebGLContext} from './js/render/core/renderer.js';
	import {Gltf2Node} from './js/render/nodes/gltf2.js';
	import {SkyboxNode} from './js/render/nodes/skybox.js';
	import {QueryArgs} from './js/util/query-args.js';

	import WebXRPolyfill from './js/third-party/webxr-polyfill/build/webxr-polyfill.module.js';
	if (QueryArgs.getBool('usePolyfill', true)) {
	let polyfill = new WebXRPolyfill();
	}

	// XR globals.
	let xrButton = null;
	let xrRefSpace = null;

	// WebGL scene globals.
	let gl = null;
	let renderer = null;
	let scene = new Scene();
	let scale = 1;
	let scale_down = true;
	let useLayerCheckbox = document.getElementById('useLayer');
	let useLayer = false;
	// layer support
	let xrGLFactory = null;
	let xrFramebuffer = null;
	let proj_layer = null;
	let count = true;

	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 WebXRButton({
	onRequestSession: onRequestSession,
	onEndSession: onEndSession
	});
	document.querySelector('header').appendChild(xrButton.domElement);

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

	function onRequestSession() {
	useLayer = useLayerCheckbox.checked;
	return navigator.xr.requestSession('immersive-vr', {
	requiredFeatures: useLayer?['layers']:[],
	}).then(onSessionStarted);
	}

	function onSessionStarted(session) {
	xrButton.setSession(session);

	session.addEventListener('end', onSessionEnded);

	gl = createWebGLContext({
	xrCompatible: true, webgl2: true
	});

	renderer = new Renderer(gl);

	scene.setRenderer(renderer);

	if (useLayer) {
	xrFramebuffer = gl.createFramebuffer();
	xrGLFactory = new XRWebGLBinding(session, gl);
	} else {
	let gllayer = new XRWebGLLayer(session, gl);
	gllayer.fixedFoveation = 1.0;
	session.updateRenderState({ baseLayer: gllayer });
	}

	session.requestReferenceSpace('local').then((refSpace) => {
	xrRefSpace = refSpace;

	if (useLayer) {
	proj_layer = xrGLFactory.createProjectionLayer({ stencil: false });
	proj_layer.fixedFoveation = 1;
	session.updateRenderState({ layers: [proj_layer] });
	}
	session.requestAnimationFrame(onXRFrame);
	});

	session.onselectstart = () => {
	count = false;
	}
	session.onselectend = () => {
	count = true;
	}
	}

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

	function onSessionEnded(event) {
	xrButton.setSession(null);

	renderer = null;
	}

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

	scene.startFrame();
	scene.updateInputSources(frame, xrRefSpace);

	session.requestAnimationFrame(onXRFrame);

	let pose = frame.getViewerPose(xrRefSpace);

	if (pose) {
	if (useLayer) {
	let views = [];
	for (let view of pose.views) {
	view.requestViewportScale(scale);
	let subImage = xrGLFactory.getViewSubImage(proj_layer, view);
	subImage.framebuffer = xrFramebuffer;
	let viewport = subImage.viewport;
	gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);
	gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, subImage.colorTexture, 0);
	gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.TEXTURE_2D, subImage.depthStencilTexture, 0);

	views.push(new WebXRView(view, subImage, viewport));
	}
	scene.drawViewArray(views);
	} else {
	let glLayer = session.renderState.baseLayer;

	gl.bindFramebuffer(gl.FRAMEBUFFER, glLayer.framebuffer);

	gl.clear(gl.COLOR_BUFFER_BIT \| gl.DEPTH_BUFFER_BIT);

	for (let view of pose.views) {
	view.requestViewportScale(scale);

	let viewport = glLayer.getViewport(view);
	gl.viewport(viewport.x, viewport.y,
	viewport.width, viewport.height);

	scene.draw(view.projectionMatrix, view.transform);
	}
	}

	if (count)
	scale += scale_down ? -0.004 : 0.004;

	if (scale >= 1) {
	scale = 1;
	scale_down = true;
	} else if (scale <= 0.125) {
	scale = 0.125;
	scale_down = false;
	}
	}

	scene.endFrame();
	}

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