samples/test-vr-links.html - external/github.com/toji/webvr.info - Git at Google

 <!doctype html>
 <!--
 Copyright 2016 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 <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 = WebVR, origin = https://webvr.info, expires = 2017-07-18 -->
     <meta http-equiv="origin-trial" data-feature="WebVR" data-expires="2017-07-18" content="AmcZQ9UIoWBHR8Q3p/7GHNVux0D2rIfqemrRFSPBaSBb8BViQVPqx3zd8i4mMIf8J70oRhdQqCvafYfBEGAonwkAAABJeyJvcmlnaW4iOiJodHRwczovL3dlYnZyLmluZm86NDQzIiwiZmVhdHVyZSI6IldlYlZSIiwiZXhwaXJ5IjoxNTAwMzM2MDAwfQ==">
     <!-- Origin Trial Token, feature = WebVR (For Chrome M59+), origin = https://webvr.info, expires = 2017-07-21 -->
     <meta http-equiv="origin-trial" data-feature="WebVR (For Chrome M59+)" data-expires="2017-07-21" content="AtJLsI9hT0/XyPU7DEDDxER7jyMU1oNeMk4diF9djsHCkwjulNzizKykf+CKW11B6+0ABoazxbd13jMxBvnUTQIAAABfeyJvcmlnaW4iOiJodHRwczovL3dlYnZyLmluZm86NDQzIiwiZmVhdHVyZSI6IldlYlZSMS4xIiwiZXhwaXJ5IjoxNTAwNjc3MDE3LCJpc1N1YmRvbWFpbiI6dHJ1ZX0=">

     <title>TEST - VR Links</title>

     <!--
       This test provides a couple of interactive VR elements that link to other
       pages, both 2D and WebVR-enabled, so that user agents can test their
       navigation behavior.
     -->

     <style>
       #webgl-canvas, #presenting-message {
         box-sizing: border-box;
         height: 100%;
         left: 0;
         margin: 0;
         position: absolute;
         top: 0;
         width: 100%;
       }
       #presenting-message {
         color: white;
         font-family: sans-serif;
         font-size: 2em;
         font-weight: bold;
         z-index: 1;
         text-align: center;
         padding: 0.5em;
         background-color: #444;
         display: none;
       }
     </style>

     <!-- This entire block in only to facilitate dynamically enabling and
     disabling the WebVR polyfill, and is not necessary for most WebVR apps.
     If you want to use the polyfill in your app, just include the js file and
     everything will work the way you want it to by default. -->
     <script>
       var WebVRConfig = {
         // Prevents the polyfill from initializing automatically.
         DEFER_INITIALIZATION: true,
         // Ensures the polyfill is always active when initialized, even if the
         // native API is available. This is probably NOT what most pages want.
         ALWAYS_APPEND_POLYFILL_DISPLAY: true,
         // Polyfill optimizations
         DIRTY_SUBMIT_FRAME_BINDINGS: true,
         BUFFER_SCALE: 0.75,
       };
     </script>
     <script src="js/third-party/webvr-polyfill.js"></script>
     <script src="js/third-party/wglu/wglu-url.js"></script>
     <script>
       // Dynamically turn the polyfill on if requested by the query args.
       if (WGLUUrl.getBool('polyfill', false)) {
         InitializeWebVRPolyfill();
       } else {
         // Shim for migration from older version of WebVR. Shouldn't be necessary for very long.
         InitializeSpecShim();
       }
     </script>
     <!-- End sample polyfill enabling logic -->

     <script src="js/third-party/gl-matrix-min.js"></script>

     <script src="js/third-party/wglu/wglu-debug-geometry.js"></script>
     <script src="js/third-party/wglu/wglu-program.js"></script>
     <script src="js/third-party/wglu/wglu-stats.js"></script>
     <script src="js/third-party/wglu/wglu-texture.js"></script>

     <script src="js/vr-cube-island.js"></script>
     <script src="js/vr-samples-util.js"></script>
   </head>
   <body>
     <canvas id="webgl-canvas"></canvas>
     <div id="presenting-message">Put on your headset now</div>
     <script>
       /* global mat4, VRCubeSea, WGLUStats, WGLUTextureLoader, VRSamplesUtil */
       (function () {
       "use strict";

       var PLAYER_HEIGHT = 1.65;

       var vrDisplay = null;
       var frameData = null;
       var projectionMat = mat4.create();
       var viewMat = mat4.create();

       var vrPresentButton = null;

       // ===================================================
       // WebGL scene setup. This code is not WebVR specific.
       // ===================================================

       // WebGL setup.
       var webglCanvas = document.getElementById("webgl-canvas");
       var glAttribs = {
         alpha: false,
       };
       var pageId = WGLUUrl.getInt('id', 0);
       var nextPageId = pageId + 1;
       var useWebgl2 = WGLUUrl.getBool('webgl2', false);
       var contextTypes = useWebgl2 ? ["webgl2"] : ["webgl", "experimental-webgl"];
       var gl = null;
       for (var i in contextTypes) {
         gl = webglCanvas.getContext(contextTypes[i], glAttribs);
         if (gl)
           break;
       }
       if (!gl) {
         var webglType = (useWebgl2 ? "WebGL 2" : "WebGL")
         VRSamplesUtil.addError("Your browser does not support " + webglType + ".");
         return;
       }
       gl.clearColor(0.1, 0.2, 0.3, 1.0);
       gl.enable(gl.DEPTH_TEST);
       gl.enable(gl.CULL_FACE);

       var textureLoader = new WGLUTextureLoader(gl);
       var texture = textureLoader.loadTexture("media/textures/cube-sea.png");
       var cubeIsland = new VRCubeIsland(gl, texture, 2, 2);
       var debugGeom = new WGLUDebugGeometry(gl);

       var enablePerformanceMonitoring = WGLUUrl.getBool(
           'enablePerformanceMonitoring', false);
       var stats = new WGLUStats(gl, enablePerformanceMonitoring);

       var presentingMessage = document.getElementById("presenting-message");

       // ================================
       // WebVR-specific code begins here.
       // ================================

       function onVRRequestPresent () {
         // This can only be called in response to a user gesture.
         vrDisplay.requestPresent([{ source: webglCanvas }]).then(function () {
           // Nothing to do because we're handling things in onVRPresentChange.
         }, function (err) {
           var errMsg = "requestPresent failed.";
           if (err && err.message) {
             errMsg += "<br/>" + err.message
           }
           VRSamplesUtil.addError(errMsg, 2000);
         });
       }

       function onVRExitPresent () {
         if (!vrDisplay.isPresenting)
           return;

         vrDisplay.exitPresent().then(function () {
           // Nothing to do because we're handling things in onVRPresentChange.
         }, function (err) {
           var errMsg = "exitPresent failed.";
           if (err && err.message) {
             errMsg += "<br/>" + err.message
           }
           VRSamplesUtil.addError(errMsg, 2000);
         });
       }

       function onVRPresentChange () {
         onResize();

         if (vrDisplay.isPresenting) {
           if (vrDisplay.capabilities.hasExternalDisplay) {
             presentingMessage.style.display = "block";

             VRSamplesUtil.removeButton(vrPresentButton);
             vrPresentButton = VRSamplesUtil.addButton("Exit VR", "E", "media/icons/cardboard64.png", onVRExitPresent);
           }
         } else {
           if (vrDisplay.capabilities.hasExternalDisplay) {
             presentingMessage.style.display = "";

             VRSamplesUtil.removeButton(vrPresentButton);
             vrPresentButton = VRSamplesUtil.addButton("Enter VR", "E", "media/icons/cardboard64.png", onVRRequestPresent);
           }
         }
       }

       if (navigator.getVRDisplays) {
         frameData = new VRFrameData();

         navigator.getVRDisplays().then(function (displays) {
           if (displays.length > 0) {
             vrDisplay = displays[displays.length - 1];

             vrDisplay.depthNear = 0.1;
             vrDisplay.depthFar = 1024.0;

             if (vrDisplay.stageParameters &&
                 vrDisplay.stageParameters.sizeX > 0 &&
                 vrDisplay.stageParameters.sizeZ > 0) {
               cubeIsland.resize(vrDisplay.stageParameters.sizeX, vrDisplay.stageParameters.sizeZ);
             }

             if (vrDisplay.capabilities.canPresent)
               vrPresentButton = VRSamplesUtil.addButton("Enter VR", "E", "media/icons/cardboard64.png", onVRRequestPresent);

             // For the benefit of automated testing. Safe to ignore.
             if (vrDisplay.capabilities.canPresent && WGLUUrl.getBool('canvasClickPresents', false))
               webglCanvas.addEventListener("click", onVRRequestPresent, false);

             window.addEventListener('vrdisplaypresentchange', onVRPresentChange, false);
             window.addEventListener('vrdisplayactivate', onVRRequestPresent, false);
             window.addEventListener('vrdisplaydeactivate', onVRExitPresent, false);
           } else {
             VRSamplesUtil.addInfo("WebVR supported, but no VRDisplays found.", 3000);
           }
         });
       } else if (navigator.getVRDevices) {
         VRSamplesUtil.addError("Your browser supports WebVR but not the latest version. See <a href='http://webvr.info'>webvr.info</a> for more info.");
       } else {
         VRSamplesUtil.addError("Your browser does not support WebVR. See <a href='http://webvr.info'>webvr.info</a> for assistance.");
       }

       function onResize () {
         if (vrDisplay && vrDisplay.isPresenting) {
           var leftEye = vrDisplay.getEyeParameters("left");
           var rightEye = vrDisplay.getEyeParameters("right");

           webglCanvas.width = Math.max(leftEye.renderWidth, rightEye.renderWidth) * 2;
           webglCanvas.height = Math.max(leftEye.renderHeight, rightEye.renderHeight);
         } else {
           webglCanvas.width = webglCanvas.offsetWidth * window.devicePixelRatio;
           webglCanvas.height = webglCanvas.offsetHeight * window.devicePixelRatio;
         }
       }
       window.addEventListener("resize", onResize, false);
       onResize();

       var leftIntersect = false;
       var rightIntersect = false;

       var playerPosition = [0, PLAYER_HEIGHT, 0];
       var leftPosition = [-0.5, PLAYER_HEIGHT, -1.0];
       var rightPosition = [0.5, PLAYER_HEIGHT, -1.0];

       function onClick () {
         if (leftIntersect) {
           // Navigate back to this page (with a different query string to force
           // navigation)
           window.location = "test-vr-links.html?id=" + nextPageId;
         } else if (rightIntersect) {
           // Navigate to a 2D site
           window.location = "index.html"
         } else {
           // Reset the background color to a random value
           gl.clearColor(
               Math.random() * 0.5,
               Math.random() * 0.5,
               Math.random() * 0.5, 1.0);
         }
       }
       webglCanvas.addEventListener("click", onClick, false);

       function getStandingViewMatrix (out, view) {
         if (vrDisplay.stageParameters) {
           // If the headset provides stageParameters use the
           // sittingToStandingTransform to transform the view matrix into a
           // space where the floor in the center of the users play space is the
           // origin.
           mat4.invert(out, vrDisplay.stageParameters.sittingToStandingTransform);
           mat4.multiply(out, view, out);
         } else {
           // Otherwise you'll want to translate the view to compensate for the
           // scene floor being at Y=0. Ideally this should match the user's
           // height (you may want to make it configurable). For this demo we'll
           // just assume all human beings are 1.65 meters (~5.4ft) tall.
           mat4.identity(out);
           mat4.translate(out, out, [0, PLAYER_HEIGHT, 0]);
           mat4.invert(out, out);
           mat4.multiply(out, view, out);
         }
       }

       function renderSceneView (projection, view) {
         cubeIsland.render(projection, view, stats);

         debugGeom.bind(projection, view);

         if (leftIntersect) {
           debugGeom.drawCube(0, leftPosition, 0.35, [0.5, 0, 1, 1]);
         } else {
           debugGeom.drawCube(0, leftPosition, 0.3, [0, 0, 1, 1]);
         }

         if (rightIntersect) {
           debugGeom.drawCube(0, rightPosition, 0.35, [0.5, 1, 0, 1]);
         } else {
           debugGeom.drawCube(0, rightPosition, 0.3, [0, 1, 0, 1]);
         }
       }

       function lookingAtSphere(position, radius, pose) {
         var lookVec = vec3.fromValues(0, 0, -1);
         vec3.transformQuat(lookVec, lookVec, pose.orientation);

         var m = vec3.create();
         vec3.sub(m, playerPosition, position);
         var b = vec3.dot(m, lookVec);
         var c = vec3.dot(m, m) - radius * radius;

         // Exit if player's origin outside of sphere (c > 0) and lookVec is pointing away from sphere (b > 0)
         if (c > 0.0 && b > 0.0)
           return false;
         var discr = b*b - c;

         // negative discriminant = lookVec misses sphere
         return (discr >= 0.0);
       }

       function onAnimationFrame (t) {
         stats.begin();

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

         if (vrDisplay) {
           vrDisplay.requestAnimationFrame(onAnimationFrame);

           vrDisplay.getFrameData(frameData);

           leftIntersect = lookingAtSphere(leftPosition, 0.35, frameData.pose);
           rightIntersect = lookingAtSphere(rightPosition, 0.35, frameData.pose);

           if (vrDisplay.isPresenting) {
             gl.viewport(0, 0, webglCanvas.width * 0.5, webglCanvas.height);
             getStandingViewMatrix(viewMat, frameData.leftViewMatrix);
             renderSceneView(frameData.leftProjectionMatrix, viewMat);

             gl.viewport(webglCanvas.width * 0.5, 0, webglCanvas.width * 0.5, webglCanvas.height);
             getStandingViewMatrix(viewMat, frameData.rightViewMatrix);
             renderSceneView(frameData.rightProjectionMatrix, viewMat);

             vrDisplay.submitFrame();
           } else {
             gl.viewport(0, 0, webglCanvas.width, webglCanvas.height);
             mat4.perspective(projectionMat, Math.PI*0.4, webglCanvas.width / webglCanvas.height, 0.1, 1024.0);
             getStandingViewMatrix(viewMat, frameData.leftViewMatrix);
             renderSceneView(projectionMat, viewMat);
             stats.renderOrtho();
           }
         } else {
           window.requestAnimationFrame(onAnimationFrame);

           // No VRDisplay found.
           gl.viewport(0, 0, webglCanvas.width, webglCanvas.height);
           mat4.perspective(projectionMat, Math.PI*0.4, webglCanvas.width / webglCanvas.height, 0.1, 1024.0);
           mat4.identity(viewMat);
           mat4.translate(viewMat, viewMat, [0, -PLAYER_HEIGHT, 0]);
           renderSceneView(projectionMat, viewMat);

           stats.renderOrtho();
         }

         stats.end();
       }
       window.requestAnimationFrame(onAnimationFrame);
       })();
     </script>
   </body>
 </html>
	<!doctype html>
	<!--
	Copyright 2016 The Chromium Authors. All rights reserved.
	Use of this source code is governed by a BSD-style license that can be
	found in the LICENSE file.
	-->
	<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 = WebVR, origin = https://webvr.info, expires = 2017-07-18 -->
	<meta http-equiv="origin-trial" data-feature="WebVR" data-expires="2017-07-18" content="AmcZQ9UIoWBHR8Q3p/7GHNVux0D2rIfqemrRFSPBaSBb8BViQVPqx3zd8i4mMIf8J70oRhdQqCvafYfBEGAonwkAAABJeyJvcmlnaW4iOiJodHRwczovL3dlYnZyLmluZm86NDQzIiwiZmVhdHVyZSI6IldlYlZSIiwiZXhwaXJ5IjoxNTAwMzM2MDAwfQ==">
	<!-- Origin Trial Token, feature = WebVR (For Chrome M59+), origin = https://webvr.info, expires = 2017-07-21 -->
	<meta http-equiv="origin-trial" data-feature="WebVR (For Chrome M59+)" data-expires="2017-07-21" content="AtJLsI9hT0/XyPU7DEDDxER7jyMU1oNeMk4diF9djsHCkwjulNzizKykf+CKW11B6+0ABoazxbd13jMxBvnUTQIAAABfeyJvcmlnaW4iOiJodHRwczovL3dlYnZyLmluZm86NDQzIiwiZmVhdHVyZSI6IldlYlZSMS4xIiwiZXhwaXJ5IjoxNTAwNjc3MDE3LCJpc1N1YmRvbWFpbiI6dHJ1ZX0=">

	<title>TEST - VR Links</title>

	<!--
	This test provides a couple of interactive VR elements that link to other
	pages, both 2D and WebVR-enabled, so that user agents can test their
	navigation behavior.
	-->

	<style>
	#webgl-canvas, #presenting-message {
	box-sizing: border-box;
	height: 100%;
	left: 0;
	margin: 0;
	position: absolute;
	top: 0;
	width: 100%;
	}
	#presenting-message {
	color: white;
	font-family: sans-serif;
	font-size: 2em;
	font-weight: bold;
	z-index: 1;
	text-align: center;
	padding: 0.5em;
	background-color: #444;
	display: none;
	}
	</style>

	<!-- This entire block in only to facilitate dynamically enabling and
	disabling the WebVR polyfill, and is not necessary for most WebVR apps.
	If you want to use the polyfill in your app, just include the js file and
	everything will work the way you want it to by default. -->
	<script>
	var WebVRConfig = {
	// Prevents the polyfill from initializing automatically.
	DEFER_INITIALIZATION: true,
	// Ensures the polyfill is always active when initialized, even if the
	// native API is available. This is probably NOT what most pages want.
	ALWAYS_APPEND_POLYFILL_DISPLAY: true,
	// Polyfill optimizations
	DIRTY_SUBMIT_FRAME_BINDINGS: true,
	BUFFER_SCALE: 0.75,
	};
	</script>
	<script src="js/third-party/webvr-polyfill.js"></script>
	<script src="js/third-party/wglu/wglu-url.js"></script>
	<script>
	// Dynamically turn the polyfill on if requested by the query args.
	if (WGLUUrl.getBool('polyfill', false)) {
	InitializeWebVRPolyfill();
	} else {
	// Shim for migration from older version of WebVR. Shouldn't be necessary for very long.
	InitializeSpecShim();
	}
	</script>
	<!-- End sample polyfill enabling logic -->

	<script src="js/third-party/gl-matrix-min.js"></script>

	<script src="js/third-party/wglu/wglu-debug-geometry.js"></script>
	<script src="js/third-party/wglu/wglu-program.js"></script>
	<script src="js/third-party/wglu/wglu-stats.js"></script>
	<script src="js/third-party/wglu/wglu-texture.js"></script>

	<script src="js/vr-cube-island.js"></script>
	<script src="js/vr-samples-util.js"></script>
	</head>
	<body>
	<canvas id="webgl-canvas"></canvas>
	<div id="presenting-message">Put on your headset now</div>
	<script>
	/* global mat4, VRCubeSea, WGLUStats, WGLUTextureLoader, VRSamplesUtil */
	(function () {
	"use strict";

	var PLAYER_HEIGHT = 1.65;

	var vrDisplay = null;
	var frameData = null;
	var projectionMat = mat4.create();
	var viewMat = mat4.create();

	var vrPresentButton = null;

	// ===================================================
	// WebGL scene setup. This code is not WebVR specific.
	// ===================================================

	// WebGL setup.
	var webglCanvas = document.getElementById("webgl-canvas");
	var glAttribs = {
	alpha: false,
	};
	var pageId = WGLUUrl.getInt('id', 0);
	var nextPageId = pageId + 1;
	var useWebgl2 = WGLUUrl.getBool('webgl2', false);
	var contextTypes = useWebgl2 ? ["webgl2"] : ["webgl", "experimental-webgl"];
	var gl = null;
	for (var i in contextTypes) {
	gl = webglCanvas.getContext(contextTypes[i], glAttribs);
	if (gl)
	break;
	}
	if (!gl) {
	var webglType = (useWebgl2 ? "WebGL 2" : "WebGL")
	VRSamplesUtil.addError("Your browser does not support " + webglType + ".");
	return;
	}
	gl.clearColor(0.1, 0.2, 0.3, 1.0);
	gl.enable(gl.DEPTH_TEST);
	gl.enable(gl.CULL_FACE);

	var textureLoader = new WGLUTextureLoader(gl);
	var texture = textureLoader.loadTexture("media/textures/cube-sea.png");
	var cubeIsland = new VRCubeIsland(gl, texture, 2, 2);
	var debugGeom = new WGLUDebugGeometry(gl);

	var enablePerformanceMonitoring = WGLUUrl.getBool(
	'enablePerformanceMonitoring', false);
	var stats = new WGLUStats(gl, enablePerformanceMonitoring);

	var presentingMessage = document.getElementById("presenting-message");

	// ================================
	// WebVR-specific code begins here.
	// ================================

	function onVRRequestPresent () {
	// This can only be called in response to a user gesture.
	vrDisplay.requestPresent([{ source: webglCanvas }]).then(function () {
	// Nothing to do because we're handling things in onVRPresentChange.
	}, function (err) {
	var errMsg = "requestPresent failed.";
	if (err && err.message) {
	errMsg += "<br/>" + err.message
	}
	VRSamplesUtil.addError(errMsg, 2000);
	});
	}

	function onVRExitPresent () {
	if (!vrDisplay.isPresenting)
	return;

	vrDisplay.exitPresent().then(function () {
	// Nothing to do because we're handling things in onVRPresentChange.
	}, function (err) {
	var errMsg = "exitPresent failed.";
	if (err && err.message) {
	errMsg += "<br/>" + err.message
	}
	VRSamplesUtil.addError(errMsg, 2000);
	});
	}

	function onVRPresentChange () {
	onResize();

	if (vrDisplay.isPresenting) {
	if (vrDisplay.capabilities.hasExternalDisplay) {
	presentingMessage.style.display = "block";

	VRSamplesUtil.removeButton(vrPresentButton);
	vrPresentButton = VRSamplesUtil.addButton("Exit VR", "E", "media/icons/cardboard64.png", onVRExitPresent);
	}
	} else {
	if (vrDisplay.capabilities.hasExternalDisplay) {
	presentingMessage.style.display = "";

	VRSamplesUtil.removeButton(vrPresentButton);
	vrPresentButton = VRSamplesUtil.addButton("Enter VR", "E", "media/icons/cardboard64.png", onVRRequestPresent);
	}
	}
	}

	if (navigator.getVRDisplays) {
	frameData = new VRFrameData();

	navigator.getVRDisplays().then(function (displays) {
	if (displays.length > 0) {
	vrDisplay = displays[displays.length - 1];

	vrDisplay.depthNear = 0.1;
	vrDisplay.depthFar = 1024.0;

	if (vrDisplay.stageParameters &&
	vrDisplay.stageParameters.sizeX > 0 &&
	vrDisplay.stageParameters.sizeZ > 0) {
	cubeIsland.resize(vrDisplay.stageParameters.sizeX, vrDisplay.stageParameters.sizeZ);
	}

	if (vrDisplay.capabilities.canPresent)
	vrPresentButton = VRSamplesUtil.addButton("Enter VR", "E", "media/icons/cardboard64.png", onVRRequestPresent);

	// For the benefit of automated testing. Safe to ignore.
	if (vrDisplay.capabilities.canPresent && WGLUUrl.getBool('canvasClickPresents', false))
	webglCanvas.addEventListener("click", onVRRequestPresent, false);

	window.addEventListener('vrdisplaypresentchange', onVRPresentChange, false);
	window.addEventListener('vrdisplayactivate', onVRRequestPresent, false);
	window.addEventListener('vrdisplaydeactivate', onVRExitPresent, false);
	} else {
	VRSamplesUtil.addInfo("WebVR supported, but no VRDisplays found.", 3000);
	}
	});
	} else if (navigator.getVRDevices) {
	VRSamplesUtil.addError("Your browser supports WebVR but not the latest version. See <a href='http://webvr.info'>webvr.info</a> for more info.");
	} else {
	VRSamplesUtil.addError("Your browser does not support WebVR. See <a href='http://webvr.info'>webvr.info</a> for assistance.");
	}

	function onResize () {
	if (vrDisplay && vrDisplay.isPresenting) {
	var leftEye = vrDisplay.getEyeParameters("left");
	var rightEye = vrDisplay.getEyeParameters("right");

	webglCanvas.width = Math.max(leftEye.renderWidth, rightEye.renderWidth) * 2;
	webglCanvas.height = Math.max(leftEye.renderHeight, rightEye.renderHeight);
	} else {
	webglCanvas.width = webglCanvas.offsetWidth * window.devicePixelRatio;
	webglCanvas.height = webglCanvas.offsetHeight * window.devicePixelRatio;
	}
	}
	window.addEventListener("resize", onResize, false);
	onResize();

	var leftIntersect = false;
	var rightIntersect = false;

	var playerPosition = [0, PLAYER_HEIGHT, 0];
	var leftPosition = [-0.5, PLAYER_HEIGHT, -1.0];
	var rightPosition = [0.5, PLAYER_HEIGHT, -1.0];

	function onClick () {
	if (leftIntersect) {
	// Navigate back to this page (with a different query string to force
	// navigation)
	window.location = "test-vr-links.html?id=" + nextPageId;
	} else if (rightIntersect) {
	// Navigate to a 2D site
	window.location = "index.html"
	} else {
	// Reset the background color to a random value
	gl.clearColor(
	Math.random() * 0.5,
	Math.random() * 0.5,
	Math.random() * 0.5, 1.0);
	}
	}
	webglCanvas.addEventListener("click", onClick, false);

	function getStandingViewMatrix (out, view) {
	if (vrDisplay.stageParameters) {
	// If the headset provides stageParameters use the
	// sittingToStandingTransform to transform the view matrix into a
	// space where the floor in the center of the users play space is the
	// origin.
	mat4.invert(out, vrDisplay.stageParameters.sittingToStandingTransform);
	mat4.multiply(out, view, out);
	} else {
	// Otherwise you'll want to translate the view to compensate for the
	// scene floor being at Y=0. Ideally this should match the user's
	// height (you may want to make it configurable). For this demo we'll
	// just assume all human beings are 1.65 meters (~5.4ft) tall.
	mat4.identity(out);
	mat4.translate(out, out, [0, PLAYER_HEIGHT, 0]);
	mat4.invert(out, out);
	mat4.multiply(out, view, out);
	}
	}

	function renderSceneView (projection, view) {
	cubeIsland.render(projection, view, stats);

	debugGeom.bind(projection, view);

	if (leftIntersect) {
	debugGeom.drawCube(0, leftPosition, 0.35, [0.5, 0, 1, 1]);
	} else {
	debugGeom.drawCube(0, leftPosition, 0.3, [0, 0, 1, 1]);
	}

	if (rightIntersect) {
	debugGeom.drawCube(0, rightPosition, 0.35, [0.5, 1, 0, 1]);
	} else {
	debugGeom.drawCube(0, rightPosition, 0.3, [0, 1, 0, 1]);
	}
	}

	function lookingAtSphere(position, radius, pose) {
	var lookVec = vec3.fromValues(0, 0, -1);
	vec3.transformQuat(lookVec, lookVec, pose.orientation);

	var m = vec3.create();
	vec3.sub(m, playerPosition, position);
	var b = vec3.dot(m, lookVec);
	var c = vec3.dot(m, m) - radius * radius;

	// Exit if player's origin outside of sphere (c > 0) and lookVec is pointing away from sphere (b > 0)
	if (c > 0.0 && b > 0.0)
	return false;
	var discr = b*b - c;

	// negative discriminant = lookVec misses sphere
	return (discr >= 0.0);
	}

	function onAnimationFrame (t) {
	stats.begin();

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

	if (vrDisplay) {
	vrDisplay.requestAnimationFrame(onAnimationFrame);

	vrDisplay.getFrameData(frameData);

	leftIntersect = lookingAtSphere(leftPosition, 0.35, frameData.pose);
	rightIntersect = lookingAtSphere(rightPosition, 0.35, frameData.pose);

	if (vrDisplay.isPresenting) {
	gl.viewport(0, 0, webglCanvas.width * 0.5, webglCanvas.height);
	getStandingViewMatrix(viewMat, frameData.leftViewMatrix);
	renderSceneView(frameData.leftProjectionMatrix, viewMat);

	gl.viewport(webglCanvas.width * 0.5, 0, webglCanvas.width * 0.5, webglCanvas.height);
	getStandingViewMatrix(viewMat, frameData.rightViewMatrix);
	renderSceneView(frameData.rightProjectionMatrix, viewMat);

	vrDisplay.submitFrame();
	} else {
	gl.viewport(0, 0, webglCanvas.width, webglCanvas.height);
	mat4.perspective(projectionMat, Math.PI*0.4, webglCanvas.width / webglCanvas.height, 0.1, 1024.0);
	getStandingViewMatrix(viewMat, frameData.leftViewMatrix);
	renderSceneView(projectionMat, viewMat);
	stats.renderOrtho();
	}
	} else {
	window.requestAnimationFrame(onAnimationFrame);

	// No VRDisplay found.
	gl.viewport(0, 0, webglCanvas.width, webglCanvas.height);
	mat4.perspective(projectionMat, Math.PI*0.4, webglCanvas.width / webglCanvas.height, 0.1, 1024.0);
	mat4.identity(viewMat);
	mat4.translate(viewMat, viewMat, [0, -PLAYER_HEIGHT, 0]);
	renderSceneView(projectionMat, viewMat);

	stats.renderOrtho();
	}

	stats.end();
	}
	window.requestAnimationFrame(onAnimationFrame);
	})();
	</script>
	</body>
	</html>