layers-samples/proj-layer.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>Projection Layer</title>
 </head>

 <body>
   <header style="max-width: 800px;">
     <details open>
       <summary>Projection Layer</summary>
       <p>
         This sample shows how to draw a scene into a projection layer.
         Projection layers are used for rendering interactive/constantly
         changing elements that need to be redrawn every frame, like
         controllers or menu systems/other UI elements.
         <a class="back" href="./index.html">Back</a>
       </p>
     </details>
   </header>
   <main style='text-align: center;'>
     <p>Click 'Enter VR' 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';

     // If requested, use the polyfill to provide support for mobile devices
     // and devices which only support WebVR.
     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 xrSession = null;
     let xrRefSpace = null;
     let xrGLFactory = null;
     let xrFramebuffer = 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' }));

     // Layer globals
     let proj_layer = null;

     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() {
       if (!xrSession) {
         navigator.xr.requestSession('immersive-vr', {
           requiredFeatures: ['layers'],
         }).then(onSessionStarted);
       } else {
         onEndSession();
       }
     }

     function initGL() {
       if (gl) { return; }

       // Create a WebGL context to render with, initialized to be compatible
       // with the XRDisplay we're presenting to.
       gl = createWebGLContext({ xrCompatible: true, webgl2: true, });
       document.body.appendChild(gl.canvas);
       gl.clearColor(0.8, 0.8, 0.8, 1);

       function onResize() {
         gl.canvas.width = gl.canvas.clientWidth * window.devicePixelRatio;
         gl.canvas.height = gl.canvas.clientHeight * window.devicePixelRatio;
       }
       window.addEventListener('resize', onResize);
       onResize();

       renderer = new Renderer(gl);
       scene.setRenderer(renderer);
     }

     // Called when we've successfully acquired a XRSession. In response we
     // will set up the necessary session state and kick off the frame loop.
     function onSessionStarted(session) {
       xrSession = session;

       // Render correct controller models if supported by WebXR input profile
       scene.inputRenderer.useProfileControllerMeshes(session);

       // Listen for the sessions 'end' event so we can respond if the user
       // or UA ends the session for any reason.
       session.addEventListener('end', onSessionEnded);

       initGL();

       xrFramebuffer = gl.createFramebuffer();
       xrGLFactory = new XRWebGLBinding(session, gl);

       session.requestReferenceSpace('local').then((refSpace) => {
         xrRefSpace = refSpace;
         proj_layer = xrGLFactory.createProjectionLayer({ space: refSpace, stencil: false });
         session.updateRenderState({ layers: [proj_layer] });

         session.requestAnimationFrame(onXRFrame);
       });
     }

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

     function onSessionEnded(event) {
       if (event.session.isImmersive) {
         xrButton.setSession(null);
       }
       xrSession = null;

       // In this simple case discard the WebGL context too, since we're not
       // rendering anything else to the screen with it.
       gl = null;
     }

     function onXRFrame(time, frame) {
       let pose = frame.getViewerPose(xrRefSpace);
       xrSession.requestAnimationFrame(onXRFrame);

       if (pose) {
         gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);

         // process input and update input sources every frame
         scene.updateInputSources(frame, xrRefSpace);

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

           gl.enable(gl.SCISSOR_TEST);
           gl.scissor(viewport.x, viewport.y, viewport.width, viewport.height);
           gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
           gl.disable(gl.SCISSOR_TEST);

           // Gather all the values needed for one view and push it into the
           // array of views to be drawn. WebXRView is a utility class that
           // holds all the necessary values for drawing a single view.

           // In future samples we'll hide this part away as well by using the
           // scene.drawXRViews() function, which handles gathering these
           // values internally.
           views.push(new WebXRView(view, glLayer, viewport));
         }
         scene.drawViewArray(views);
       }
       scene.endFrame();
     }

     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>Projection Layer</title>
	</head>

	<body>
	<header style="max-width: 800px;">
	<details open>
	<summary>Projection Layer</summary>
	<p>
	This sample shows how to draw a scene into a projection layer.
	Projection layers are used for rendering interactive/constantly
	changing elements that need to be redrawn every frame, like
	controllers or menu systems/other UI elements.
	<a class="back" href="./index.html">Back</a>
	</p>
	</details>
	</header>
	<main style='text-align: center;'>
	<p>Click 'Enter VR' 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';

	// If requested, use the polyfill to provide support for mobile devices
	// and devices which only support WebVR.
	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 xrSession = null;
	let xrRefSpace = null;
	let xrGLFactory = null;
	let xrFramebuffer = 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' }));

	// Layer globals
	let proj_layer = null;

	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() {
	if (!xrSession) {
	navigator.xr.requestSession('immersive-vr', {
	requiredFeatures: ['layers'],
	}).then(onSessionStarted);
	} else {
	onEndSession();
	}
	}

	function initGL() {
	if (gl) { return; }

	// Create a WebGL context to render with, initialized to be compatible
	// with the XRDisplay we're presenting to.
	gl = createWebGLContext({ xrCompatible: true, webgl2: true, });
	document.body.appendChild(gl.canvas);
	gl.clearColor(0.8, 0.8, 0.8, 1);

	function onResize() {
	gl.canvas.width = gl.canvas.clientWidth * window.devicePixelRatio;
	gl.canvas.height = gl.canvas.clientHeight * window.devicePixelRatio;
	}
	window.addEventListener('resize', onResize);
	onResize();

	renderer = new Renderer(gl);
	scene.setRenderer(renderer);
	}

	// Called when we've successfully acquired a XRSession. In response we
	// will set up the necessary session state and kick off the frame loop.
	function onSessionStarted(session) {
	xrSession = session;

	// Render correct controller models if supported by WebXR input profile
	scene.inputRenderer.useProfileControllerMeshes(session);

	// Listen for the sessions 'end' event so we can respond if the user
	// or UA ends the session for any reason.
	session.addEventListener('end', onSessionEnded);

	initGL();

	xrFramebuffer = gl.createFramebuffer();
	xrGLFactory = new XRWebGLBinding(session, gl);

	session.requestReferenceSpace('local').then((refSpace) => {
	xrRefSpace = refSpace;
	proj_layer = xrGLFactory.createProjectionLayer({ space: refSpace, stencil: false });
	session.updateRenderState({ layers: [proj_layer] });

	session.requestAnimationFrame(onXRFrame);
	});
	}

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

	function onSessionEnded(event) {
	if (event.session.isImmersive) {
	xrButton.setSession(null);
	}
	xrSession = null;

	// In this simple case discard the WebGL context too, since we're not
	// rendering anything else to the screen with it.
	gl = null;
	}

	function onXRFrame(time, frame) {
	let pose = frame.getViewerPose(xrRefSpace);
	xrSession.requestAnimationFrame(onXRFrame);

	if (pose) {
	gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);

	// process input and update input sources every frame
	scene.updateInputSources(frame, xrRefSpace);

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

	gl.enable(gl.SCISSOR_TEST);
	gl.scissor(viewport.x, viewport.y, viewport.width, viewport.height);
	gl.clear(gl.COLOR_BUFFER_BIT \| gl.DEPTH_BUFFER_BIT);
	gl.disable(gl.SCISSOR_TEST);

	// Gather all the values needed for one view and push it into the
	// array of views to be drawn. WebXRView is a utility class that
	// holds all the necessary values for drawing a single view.

	// In future samples we'll hide this part away as well by using the
	// scene.drawXRViews() function, which handles gathering these
	// values internally.
	views.push(new WebXRView(view, glLayer, viewport));
	}
	scene.drawViewArray(views);
	}
	scene.endFrame();
	}

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

	</html>