layers-samples/proj-multiview.html - external/github.com/immersive-web/webxr-samples - Git at Google

 <!doctype html>
 <!--
 Copyright 2021 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 with Multiview</title>
 </head>

 <body>
   <header>
     <details open>
       <summary>Projection Layer with Multiview</summary>
       <p>
         This sample demonstrates a simple technique to reduce the number of
         state changes an application needs to make while rendering, potentially
         enabling better performance.
         <a class="back" href="./">Back</a>
       </p>
       <p id="mv-status"></p>
       <input type="checkbox" id="do_stencil_buffer">stencil buffer</input>
       <input type="checkbox" id="do_antialias">antialias</input>
     </details>
   </header>
   <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 { CubeSeaNode } from '../js/render/nodes/cube-sea.js';
     import { InlineViewerHelper } from '../js/util/inline-viewer-helper.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 do_stencil_buffer = document.getElementById('do_stencil_buffer');
     let do_antialias = document.getElementById('do_antialias');
     let xrButton = null;
     let xrImmersiveRefSpace = null;
     let inlineViewerHelper = null;
     let xrGLFactory = null;
     let xrFramebuffer = null;

     // WebGL scene globals.
     let gl = null;
     let renderer = null;
     let scene = new Scene();
     let is_multisampled_supported = false;
     let samples = 1;
     let mv_ext = null;
     let depthStencilTex = null;

     scene.addNode(new CubeSeaNode({ imageUrl: '../media/textures/cube-sea.png' }));
     scene.enableStats(false);

     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) => {
           let mvCompat = testMultiViewCompatibility();
           if (!mvCompat) {
             document.querySelector('#mv-status').textContent = "❌ - Multiview Unsupported";
           } else {
             document.querySelector('#mv-status').textContent = "✔️- Multiview Supported";
           }
           xrButton.enabled = supported && mvCompat;
         });

         navigator.xr.requestSession('inline').then(onSessionStarted);
       }
     }

     function testMultiViewCompatibility() {
       let tempWebGLContext = createWebGLContext({
         xrCompatible: true,
         webgl2: true
       });

       return tempWebGLContext.getExtension('OCULUS_multiview') != null;
     }

     function initGL() {
       if (gl)
         return;

       gl = createWebGLContext({
         xrCompatible: true,
         webgl2: true
       });
       document.body.appendChild(gl.canvas);

       samples = gl.getParameter(gl.MAX_SAMPLES);

       mv_ext = gl.getExtension('OCULUS_multiview');
       if (mv_ext) {
         console.log("OCULUS_multiview extension is supported");
         is_multisampled_supported = true;
       }
       else {
         console.log("OCULUS_multiview extension is NOT supported");
       }
       if (!mv_ext) {
         mv_ext = gl.getExtension('OVR_multiview2');
         if (mv_ext) {
           console.log("OVR_multiview2 extension is supported");
         }
         else {
           console.log("Neither OCULUS_multiview nor OVR_multiview2 extension is NOT supported");
         }
       }

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

       // Set up a non-black clear color so that we can see if something renders wrong.
       gl.clearColor(0.1, 0.2, 0.3, 1.0);
     }

     function onRequestSession() {
       return navigator.xr.requestSession('immersive-vr', { requiredFeatures: ['layers'] }).then((session) => {
         xrButton.setSession(session);
         session.isImmersive = true;
         onSessionStarted(session);
       });
     }

     function onVisibilityChange(event) {
       console.log("Visibility change for "
         + (event.session.isImmersive ? "immersive" : "non-immersive")
         + " session: "
         + event.session.visibilityState);
     }

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

       initGL();

       if (session.isImmersive) {
         renderer = new Renderer(gl, true /* multiview */);

         scene.setRenderer(renderer);


         xrFramebuffer = gl.createFramebuffer();
         xrGLFactory = new XRWebGLBinding(session, gl);
         let layer = xrGLFactory.createProjectionLayer({
           textureType: "texture-array",
           depthFormat: do_stencil_buffer.checked ? gl.DEPTH24_STENCIL8 : gl.DEPTH_COMPONENT24
         });
         session.updateRenderState({ layers: [layer] });
       } else {
         renderer = new Renderer(gl, false /* multiview */);

         scene.setRenderer(renderer);

         let glLayer = new XRWebGLLayer(session, gl);
         session.updateRenderState({ baseLayer: glLayer });
       }

       let refSpaceType = session.isImmersive ? 'local' : 'viewer';
       session.requestReferenceSpace(refSpaceType).then((refSpace) => {
         if (session.isImmersive) {
           xrImmersiveRefSpace = refSpace;
         } else {
           // In most samples moving forward we'll use this helper class rather
           // than the reference space directly to inject the necessary logic
           // for looking around an inline session with mouse and touch input.
           inlineViewerHelper = new InlineViewerHelper(gl.canvas, refSpace);
         }
         session.requestAnimationFrame(onXRFrame);
       });
     }

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

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

     function onXRFrame(t, frame) {
       let session = frame.session;
       let refSpace = session.isImmersive ?
         xrImmersiveRefSpace :
         inlineViewerHelper.referenceSpace;
       let pose = frame.getViewerPose(refSpace);

       scene.startFrame();

       session.requestAnimationFrame(onXRFrame);

       if (pose) {
         let glLayer = null;

         if (session.isImmersive) {
           gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);
         } else {
           glLayer = session.renderState.baseLayer;
           gl.bindFramebuffer(gl.FRAMEBUFFER, glLayer.framebuffer);
           gl.disable(gl.SCISSOR_TEST);
           gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
         }

         let views = [];
         for (let view of pose.views) {
           let viewport = null;
           if (session.isImmersive) {
             glLayer = xrGLFactory.getViewSubImage(session.renderState.layers[0], view);
             viewport = glLayer.viewport;
             glLayer.framebuffer = xrFramebuffer;
             gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);
             if (views.length == 0) { // for multiview we need to set fbo only once
               if (!is_multisampled_supported || !do_antialias.checked)
                 mv_ext.framebufferTextureMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, glLayer.colorTexture, 0, 0, 2);
               else
                 mv_ext.framebufferTextureMultisampleMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, glLayer.colorTexture, 0, samples, 0, 2);

               if (glLayer.depthStencilTexture === null) {
                 if (depthStencilTex === null) {
                   console.log("MaxViews = " + gl.getParameter(mv_ext.MAX_VIEWS_OVR));
                   depthStencilTex = gl.createTexture();
                   gl.bindTexture(gl.TEXTURE_2D_ARRAY, depthStencilTex);
                   gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.DEPTH_COMPONENT24, viewport.width, viewport.height, 2);
                 }
               } else {
                 depthStencilTex = glLayer.depthStencilTexture;
               }
               if (!is_multisampled_supported || !do_antialias.checked)
                 mv_ext.framebufferTextureMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.DEPTH_ATTACHMENT, depthStencilTex, 0, 0, 2);
               else
                 mv_ext.framebufferTextureMultisampleMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.DEPTH_ATTACHMENT, depthStencilTex, 0, samples, 0, 2);

               gl.disable(gl.SCISSOR_TEST);
               gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
             }
           } else {
             viewport = glLayer.getViewport(view);
           }
           views.push(new WebXRView(view, glLayer, viewport));
         }

         scene.drawViewArray(views);
       }

       scene.endFrame();
     }

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

 </html>
	<!doctype html>
	<!--
	Copyright 2021 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 with Multiview</title>
	</head>

	<body>
	<header>
	<details open>
	<summary>Projection Layer with Multiview</summary>
	<p>
	This sample demonstrates a simple technique to reduce the number of
	state changes an application needs to make while rendering, potentially
	enabling better performance.
	<a class="back" href="./">Back</a>
	</p>
	<p id="mv-status"></p>
	<input type="checkbox" id="do_stencil_buffer">stencil buffer</input>
	<input type="checkbox" id="do_antialias">antialias</input>
	</details>
	</header>
	<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 { CubeSeaNode } from '../js/render/nodes/cube-sea.js';
	import { InlineViewerHelper } from '../js/util/inline-viewer-helper.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 do_stencil_buffer = document.getElementById('do_stencil_buffer');
	let do_antialias = document.getElementById('do_antialias');
	let xrButton = null;
	let xrImmersiveRefSpace = null;
	let inlineViewerHelper = null;
	let xrGLFactory = null;
	let xrFramebuffer = null;

	// WebGL scene globals.
	let gl = null;
	let renderer = null;
	let scene = new Scene();
	let is_multisampled_supported = false;
	let samples = 1;
	let mv_ext = null;
	let depthStencilTex = null;

	scene.addNode(new CubeSeaNode({ imageUrl: '../media/textures/cube-sea.png' }));
	scene.enableStats(false);

	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) => {
	let mvCompat = testMultiViewCompatibility();
	if (!mvCompat) {
	document.querySelector('#mv-status').textContent = "❌ - Multiview Unsupported";
	} else {
	document.querySelector('#mv-status').textContent = "✔️- Multiview Supported";
	}
	xrButton.enabled = supported && mvCompat;
	});

	navigator.xr.requestSession('inline').then(onSessionStarted);
	}
	}

	function testMultiViewCompatibility() {
	let tempWebGLContext = createWebGLContext({
	xrCompatible: true,
	webgl2: true
	});

	return tempWebGLContext.getExtension('OCULUS_multiview') != null;
	}

	function initGL() {
	if (gl)
	return;

	gl = createWebGLContext({
	xrCompatible: true,
	webgl2: true
	});
	document.body.appendChild(gl.canvas);

	samples = gl.getParameter(gl.MAX_SAMPLES);

	mv_ext = gl.getExtension('OCULUS_multiview');
	if (mv_ext) {
	console.log("OCULUS_multiview extension is supported");
	is_multisampled_supported = true;
	}
	else {
	console.log("OCULUS_multiview extension is NOT supported");
	}
	if (!mv_ext) {
	mv_ext = gl.getExtension('OVR_multiview2');
	if (mv_ext) {
	console.log("OVR_multiview2 extension is supported");
	}
	else {
	console.log("Neither OCULUS_multiview nor OVR_multiview2 extension is NOT supported");
	}
	}

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

	// Set up a non-black clear color so that we can see if something renders wrong.
	gl.clearColor(0.1, 0.2, 0.3, 1.0);
	}

	function onRequestSession() {
	return navigator.xr.requestSession('immersive-vr', { requiredFeatures: ['layers'] }).then((session) => {
	xrButton.setSession(session);
	session.isImmersive = true;
	onSessionStarted(session);
	});
	}

	function onVisibilityChange(event) {
	console.log("Visibility change for "
	+ (event.session.isImmersive ? "immersive" : "non-immersive")
	+ " session: "
	+ event.session.visibilityState);
	}

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

	initGL();

	if (session.isImmersive) {
	renderer = new Renderer(gl, true /* multiview */);

	scene.setRenderer(renderer);


	xrFramebuffer = gl.createFramebuffer();
	xrGLFactory = new XRWebGLBinding(session, gl);
	let layer = xrGLFactory.createProjectionLayer({
	textureType: "texture-array",
	depthFormat: do_stencil_buffer.checked ? gl.DEPTH24_STENCIL8 : gl.DEPTH_COMPONENT24
	});
	session.updateRenderState({ layers: [layer] });
	} else {
	renderer = new Renderer(gl, false /* multiview */);

	scene.setRenderer(renderer);

	let glLayer = new XRWebGLLayer(session, gl);
	session.updateRenderState({ baseLayer: glLayer });
	}

	let refSpaceType = session.isImmersive ? 'local' : 'viewer';
	session.requestReferenceSpace(refSpaceType).then((refSpace) => {
	if (session.isImmersive) {
	xrImmersiveRefSpace = refSpace;
	} else {
	// In most samples moving forward we'll use this helper class rather
	// than the reference space directly to inject the necessary logic
	// for looking around an inline session with mouse and touch input.
	inlineViewerHelper = new InlineViewerHelper(gl.canvas, refSpace);
	}
	session.requestAnimationFrame(onXRFrame);
	});
	}

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

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

	function onXRFrame(t, frame) {
	let session = frame.session;
	let refSpace = session.isImmersive ?
	xrImmersiveRefSpace :
	inlineViewerHelper.referenceSpace;
	let pose = frame.getViewerPose(refSpace);

	scene.startFrame();

	session.requestAnimationFrame(onXRFrame);

	if (pose) {
	let glLayer = null;

	if (session.isImmersive) {
	gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);
	} else {
	glLayer = session.renderState.baseLayer;
	gl.bindFramebuffer(gl.FRAMEBUFFER, glLayer.framebuffer);
	gl.disable(gl.SCISSOR_TEST);
	gl.clear(gl.COLOR_BUFFER_BIT \| gl.DEPTH_BUFFER_BIT);
	}

	let views = [];
	for (let view of pose.views) {
	let viewport = null;
	if (session.isImmersive) {
	glLayer = xrGLFactory.getViewSubImage(session.renderState.layers[0], view);
	viewport = glLayer.viewport;
	glLayer.framebuffer = xrFramebuffer;
	gl.bindFramebuffer(gl.FRAMEBUFFER, xrFramebuffer);
	if (views.length == 0) { // for multiview we need to set fbo only once
	if (!is_multisampled_supported \|\| !do_antialias.checked)
	mv_ext.framebufferTextureMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, glLayer.colorTexture, 0, 0, 2);
	else
	mv_ext.framebufferTextureMultisampleMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, glLayer.colorTexture, 0, samples, 0, 2);

	if (glLayer.depthStencilTexture === null) {
	if (depthStencilTex === null) {
	console.log("MaxViews = " + gl.getParameter(mv_ext.MAX_VIEWS_OVR));
	depthStencilTex = gl.createTexture();
	gl.bindTexture(gl.TEXTURE_2D_ARRAY, depthStencilTex);
	gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.DEPTH_COMPONENT24, viewport.width, viewport.height, 2);
	}
	} else {
	depthStencilTex = glLayer.depthStencilTexture;
	}
	if (!is_multisampled_supported \|\| !do_antialias.checked)
	mv_ext.framebufferTextureMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.DEPTH_ATTACHMENT, depthStencilTex, 0, 0, 2);
	else
	mv_ext.framebufferTextureMultisampleMultiviewOVR(gl.DRAW_FRAMEBUFFER, gl.DEPTH_ATTACHMENT, depthStencilTex, 0, samples, 0, 2);

	gl.disable(gl.SCISSOR_TEST);
	gl.clear(gl.COLOR_BUFFER_BIT \| gl.DEPTH_BUFFER_BIT);
	}
	} else {
	viewport = glLayer.getViewport(view);
	}
	views.push(new WebXRView(view, glLayer, viewport));
	}

	scene.drawViewArray(views);
	}

	scene.endFrame();
	}

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

	</html>