third_party/webxr_test_pages/webxr-samples/input-selection.html - chromium/src.git - 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
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 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
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 <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>Input Selection</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/xrray-polyfill.js' type='module'></script>
     <script src='js/webxr-polyfill.js'></script>

     <script src='js/webxr-button.js'></script>
   </head>
   <body>
     <header>
       <details open>
         <summary>Input Selection</summary>
         <p>
           This sample demonstrates handling 'select' events generated by
           XRInputSources to create clickable objects in the scene.
           <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 {Node} from './js/cottontail/src/core/node.js';
       import {PbrMaterial} from './js/cottontail/src/materials/pbr.js';
       import {BoxBuilder} from './js/cottontail/src/geometry/box-builder.js';
       import {mat4, vec3, quat} from './js/cottontail/src/math/gl-matrix.js';
       import {BoundsRenderer} from './js/cottontail/src/nodes/bounds-renderer.js';

       // If requested, initialize the WebXR polyfill
       if (QueryArgs.getBool('allowPolyfill', false)) {
         var polyfill = new WebXRPolyfill();
       }

       // Temporary
       let hideStats = QueryArgs.getBool('hideStats', false);

       // XR globals.
       let xrButton = null;
       let xrImmersiveRefSpace = null;
       let xrNonImmersiveRefSpace = null;

       // WebGL scene globals.
       let gl = null;
       let renderer = null;
       let scene = new Scene();
       let boundsRenderer = null;
       if (hideStats) {
         scene.enableStats(false);
       }
       scene.addNode(new Gltf2Node({url: '../media/gltf/cube-room/cube-room.gltf'}));
       scene.standingStats(true);

       let boxes = [];

       let trackingSpaceOriginInWorldSpace = vec3.create();
       let trackingSpaceHeadingDegrees = 0;  // around +Y axis, positive angles rotate left
       let floorSize = 10;
       let floorPosition = [0, -floorSize / 2 + 0.01, 0];
       let floorNode = null;

       let controllerTable = {};
       let boxTable = {};
       let movableBoxes = {};
       let loggedGamepadInfo = {};

       class XRControllerState {
         constructor(button_count) {
           this.buttons = [];
           for (let i = 0; i < button_count; ++i) {
             this.buttons.push(false);
           }
         }

         // returns array of buttons to fire events for
         update(gamepad) {
           let result = [];
           for (let i = 0; i < this.buttons.length; ++i) {
             let old_state = this.buttons[i];
             let new_state = gamepad.buttons[i].pressed;
             if (old_state && !new_state) {
               // Button which was previously pressed is not pressed anymore.
               result.push(i);
             }
             this.buttons[i] = new_state;
           }
           return result;
         }
       }

       class GamepadBoxSet {
         constructor(button_count, x, z) {
           this.box_list = [];
           this.box_state = [];
           for (let y = 1; y <= button_count; ++y) {
             addBox(x, y, z, 1, 0, 0, this.box_list);
             this.box_state.push(true);
           }
         }

         toggle(box_index) {
           let box = this.box_list[box_index];
           let uniforms = box.renderPrimitive.uniforms;
           if (this.box_state[box_index]) {
             uniforms.baseColorFactor.value = [0, 1, 0, 1];
           } else {
             uniforms.baseColorFactor.value = [1, 0, 0, 1];
           }
           this.box_state[box_index] = !this.box_state[box_index];
         }
       }

       class MovableBox {
         constructor(x, y, z, inv_speed) {
           this.box_list = [];
           addBox(x, y, z, 0, 0, 1, this.box_list);
           this.inv_speed = inv_speed;
         }

         update(dx, dz) {
           vec3.add(this.box_list[0].position, this.box_list[0].position, [dx / this.inv_speed, 0, dz / this.inv_speed]);
         }
       }

       function ProcessGamepad(gamepad, input_source) {
         let hand = input_source.handedness;
         if (!(hand in loggedGamepadInfo)) {
           loggedGamepadInfo[hand] = true;
           console.log(gamepad);
         }
         if (!(hand in movableBoxes)) {
           let x = 2;
           let z = 2;
           if (hand == "right") {
             x = -2;
             z = -2;
           }
           movableBoxes[hand] = new MovableBox(x, 2, z, 100);
         }
         if (!(hand in boxTable)) {
           let x = 1;
           let z = 1;
           if (hand == "right") {
             x = -1;
             z = -1;
           }
           boxTable[hand] = new GamepadBoxSet(gamepad.buttons.length, x, z);
         }
         if (!(hand in controllerTable)) {
           controllerTable[hand] = new XRControllerState(gamepad.buttons.length);
         }
         let buttons_fired = controllerTable[hand].update(gamepad);
         for (let button_index of buttons_fired) {
           console.log("controller for " + hand + " hand fired button " + button_index.toString());
           boxTable[hand].toggle(button_index);
         }
         for (let i = 0; i < gamepad.axes.length; i += 2) {
           let dx = gamepad.axes[i];
           let dy = gamepad.axes[i + 1];
           if (dx != 0 || dy != 0) {
             movableBoxes[hand].update(dx, -dy);
           }
         }
       }

       function initXR() {
         xrButton = new XRDeviceButton({
           onRequestSession: onRequestSession,
           onEndSession: onEndSession,
           supportedSessionTypes: ['immersive-vr']
         });
         document.querySelector('header').appendChild(xrButton.domElement);

         if (navigator.xr) {
           const mode = 'inline';
           navigator.xr.requestSession(mode).then((session) => {
             session.mode = mode;
             onSessionStarted(session);
           });
         } else {
           initFallback();
         }
       }

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

       function addBox(x, y, z, r, g, b, box_list) {
         let boxBuilder = new BoxBuilder();
         boxBuilder.pushCube([0, 0, 0], 0.4);
         let boxPrimitive = boxBuilder.finishPrimitive(renderer);
         let boxMaterial = new PbrMaterial();
         boxMaterial.baseColorFactor.value = [r, g, b, 1.0];
         let boxRenderPrimitive = renderer.createRenderPrimitive(boxPrimitive, boxMaterial);
         let boxNode = new Node();
         boxNode.addRenderPrimitive(boxRenderPrimitive);
         // Marks the node as one that needs to be checked when hit testing.
         boxNode.selectable = true;
         box_list.push({
           node: boxNode,
           renderPrimitive: boxRenderPrimitive,
           position: [x, y, z]
         });
         scene.addNode(boxNode);
       }

       function initGL() {
         if (gl)
           return;

         gl = createWebGLContext({
           xrCompatible: true
         });

         renderer = new Renderer(gl);

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

         // Create several boxes to use for hit testing.
         addBox(-1.0, 1.6, -1.3, 1.0, 0.0, 0.0, boxes);
         addBox(0.0, 1.7, -1.5, 0.0, 1.0, 0.0, boxes);
         addBox(1.0, 1.6, -1.3, 0.0, 0.0, 1.0, boxes);

         addFloorBox();
       }

       function addFloorBox() {
         let boxBuilder = new BoxBuilder();
         boxBuilder.pushCube([0, 0, 0], floorSize);
         let boxPrimitive = boxBuilder.finishPrimitive(renderer);

         let boxMaterial = new PbrMaterial();
         boxMaterial.baseColorFactor.value = [0.3, 0.3, 0.3, 1.0];
         let boxRenderPrimitive = renderer.createRenderPrimitive(boxPrimitive, boxMaterial);

         floorNode = new Node();
         floorNode.addRenderPrimitive(boxRenderPrimitive);
         floorNode.selectable = true;
         scene.addNode(floorNode);
         mat4.identity(floorNode.matrix);
         mat4.translate(floorNode.matrix, floorNode.matrix, floorPosition);
       }

       function onRequestSession() {
         const mode = 'immersive-vr';
         navigator.xr.requestSession(mode).then((session) => {
           session.mode = mode;
           xrButton.setSession(session);
           onSessionStarted(session);
         });
       }

       function onSessionStarted(session) {
         if (!session.mode) {
           session.mode = 'inline';
         }

         session.addEventListener('end', onSessionEnded);

         // By listening for the 'select' event we can find out when the user has
         // performed some sort of primary input action and respond to it.
         session.addEventListener('select', onSelect);

         initGL();

         let outputCanvas = document.createElement('canvas');
         document.body.appendChild(outputCanvas);

         session.updateRenderState({
             baseLayer: new XRWebGLLayer(session, gl),
             outputContext: outputCanvas.getContext('xrpresent')
         });

         // Same logic for establishing a reference space as in room-scale.html
         session.requestReferenceSpace({ type: 'stationary', subtype: 'floor-level' }).then((refSpace) => {
           return refSpace;
         }, (e) => {
           if (!session.mode.startsWith('immersive')) {
             // If we're in inline mode, our underlying platform may not support
             // the stationary reference space, but an identity space is guaranteed.
             console.log("falling back to identity reference space");
             return session.requestReferenceSpace({ type: 'identity' });
           } else {
             throw e;
           }
         }).then((refSpace) => {
           if (session.mode.startsWith('immersive')) {
             xrImmersiveRefSpace = refSpace;
           } else {
             xrNonImmersiveRefSpace = refSpace;
           }

           session.requestAnimationFrame(onXRFrame);
         });
       }

       let playerInWorldSpaceOld = vec3.create();
       let playerInWorldSpaceNew = vec3.create();
       let playerOffsetInWorldSpaceOld = vec3.create();
       let playerOffsetInWorldSpaceNew = vec3.create();
       let rotationDeltaQuat = quat.create();

       function onSelect(ev) {
         let session = ev.frame.session;
         let refSpace = getRefSpace(session);

         let headPose = ev.frame.getPose(session.viewerSpace, refSpace);
         if (!headPose) return;

         // Get the position offset in world space from the tracking space origin
         // to the player's feet. The headPose position is the head position in world space.
         // Subtract the tracking space origin position in world space to get a relative world space vector.
         vec3.set(playerInWorldSpaceOld, headPose.transform.position.x, 0, headPose.transform.position.z);
         vec3.sub(playerOffsetInWorldSpaceOld, playerInWorldSpaceOld, trackingSpaceOriginInWorldSpace);

         // based on https://github.com/immersive-web/webxr/blob/master/input-explainer.md#targeting-ray-pose
         let inputSourcePose = ev.frame.getPose(ev.inputSource.targetRaySpace, refSpace);
         if (!inputSourcePose) {
           return;
         }

         vec3.copy(playerInWorldSpaceNew, playerInWorldSpaceOld);
         let rotationDelta = 0;

         // Hit test results can change teleport position and orientation.
         let targetRay = new XRRay(inputSourcePose.transform);
         let hitResult = scene.hitTest(targetRay)
         if (hitResult) {
           // Check to see if the hit result was one of our boxes.
           for (let i = 0; i < boxes.length; ++i) {
             let box = boxes[i];
             if (hitResult.node == box.node) {
               // Change the box color to something random.
               let uniforms = box.renderPrimitive.uniforms;
               uniforms.baseColorFactor.value = [Math.random(), Math.random(), Math.random(), 1.0];
               if (i == 0) {
                 // turn left
                 rotationDelta = 30;
               } else if (i == 1) {
                 // reset heading by undoing the current rotation
                 rotationDelta = -trackingSpaceHeadingDegrees;
               } else if (i == 2) {
                 // turn right
                 rotationDelta = -30;
               }
               console.log('rotate by', rotationDelta);
             }
             if (hitResult.node == floorNode) {
                // New position uses x/z values of the hit test result, keeping y at 0 (floor level)
                playerInWorldSpaceNew[0] = hitResult.intersection[0];
                playerInWorldSpaceNew[1] = 0;
                playerInWorldSpaceNew[2] = hitResult.intersection[2];
                console.log('teleport to', playerInWorldSpaceNew);
             }
           }
         }

         // Get the new world space offset vector from tracking space origin
         // to the player's feet, for the updated tracking space rotation.
         // Formally, this is the old world-space player offset transformed
         // into tracking space using the old originOffset's rotation component,
         // then transformed back into world space using the inverse of the
         // new originOffset. This simplifies to a rotation of the old player
         // offset by (new angle - old angle):
         //   worldOffsetNew = inv(rot_of(originoffsetNew)) * rot_of(originoffsetOld) * worldOffsetOld
         //       = inv(rotY(-angleNew)) * rotY(-angleOld) * worldOffsetOld
         //       = rotY(angleNew) * rotY(-angleOld) * worldOffsetOld
         //       = rotY(angleNew - angleOld) * worldOffsetOld
         quat.identity(rotationDeltaQuat);
         quat.rotateY(rotationDeltaQuat, rotationDeltaQuat, rotationDelta * Math.PI / 180);
         vec3.transformQuat(playerOffsetInWorldSpaceNew, playerOffsetInWorldSpaceOld, rotationDeltaQuat);
         trackingSpaceHeadingDegrees += rotationDelta;

         // Update tracking space origin so that origin + playerOffset == player location in world space
         vec3.sub(trackingSpaceOriginInWorldSpace, playerInWorldSpaceNew, playerOffsetInWorldSpaceNew);

         // Compute the origin offset
         quat.identity(invOrientation);
         quat.rotateY(invOrientation, invOrientation, -trackingSpaceHeadingDegrees * Math.PI / 180);
         vec3.negate(invPosition, trackingSpaceOriginInWorldSpace);
         vec3.transformQuat(invPosition, invPosition, invOrientation);
         let xform = new XRRigidTransform(
           {x: invPosition[0], y: invPosition[1], z: invPosition[2]},
           {x: invOrientation[0], y: invOrientation[1], z: invOrientation[2], w: invOrientation[3]});

         // Update refSpace to use a new originOffset with the teleported player position and orientation
         refSpace = refSpace.getOffsetReferenceSpace(xform);

         console.log('teleport to', trackingSpaceOriginInWorldSpace);
       }

       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);
         }
       }

       let invPosition = vec3.create();
       let invOrientation = quat.create();

       function getRefSpace(session) {
         return session.mode.startsWith('immersive') ?
                xrImmersiveRefSpace :
                xrNonImmersiveRefSpace;
       }

       function onXRFrame(time, frame) {
         let session = frame.session;
         let refSpace = getRefSpace(session);

         let pose = frame.getViewerPose(refSpace);
         scene.startFrame();
         session.requestAnimationFrame(onXRFrame);

         function updateBoxes(box_list, rotate) {
           // Update the matrix for each box
           for (let box of box_list) {
             let node = box.node;
             mat4.identity(node.matrix);
             mat4.translate(node.matrix, node.matrix, box.position);
             if (rotate) {
               mat4.rotateX(node.matrix, node.matrix, time/1000);
               mat4.rotateY(node.matrix, node.matrix, time/1500);
             }
           }
         }

         for (let source of session.inputSources) {
           let gamepad = source.gamepad;
           if (gamepad) {
             ProcessGamepad(gamepad, source);
           }
         }

         updateBoxes(boxes, true);
         for (let hand in boxTable) {
           updateBoxes(boxTable[hand].box_list, false);
         }
         for (let hand in movableBoxes) {
           updateBoxes(movableBoxes[hand].box_list, false);
         }

         // In this sample and most samples after it we'll use a helper function
         // to automatically add the right meshes for the session's input sources
         // each frame. This also does simple hit detection to position the
         // cursors correctly on the surface of selectable nodes.
         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>Input Selection</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/xrray-polyfill.js' type='module'></script>
	<script src='js/webxr-polyfill.js'></script>

	<script src='js/webxr-button.js'></script>
	</head>
	<body>
	<header>
	<details open>
	<summary>Input Selection</summary>
	<p>
	This sample demonstrates handling 'select' events generated by
	XRInputSources to create clickable objects in the scene.
	<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 {Node} from './js/cottontail/src/core/node.js';
	import {PbrMaterial} from './js/cottontail/src/materials/pbr.js';
	import {BoxBuilder} from './js/cottontail/src/geometry/box-builder.js';
	import {mat4, vec3, quat} from './js/cottontail/src/math/gl-matrix.js';
	import {BoundsRenderer} from './js/cottontail/src/nodes/bounds-renderer.js';

	// If requested, initialize the WebXR polyfill
	if (QueryArgs.getBool('allowPolyfill', false)) {
	var polyfill = new WebXRPolyfill();
	}

	// Temporary
	let hideStats = QueryArgs.getBool('hideStats', false);

	// XR globals.
	let xrButton = null;
	let xrImmersiveRefSpace = null;
	let xrNonImmersiveRefSpace = null;

	// WebGL scene globals.
	let gl = null;
	let renderer = null;
	let scene = new Scene();
	let boundsRenderer = null;
	if (hideStats) {
	scene.enableStats(false);
	}
	scene.addNode(new Gltf2Node({url: '../media/gltf/cube-room/cube-room.gltf'}));
	scene.standingStats(true);

	let boxes = [];

	let trackingSpaceOriginInWorldSpace = vec3.create();
	let trackingSpaceHeadingDegrees = 0; // around +Y axis, positive angles rotate left
	let floorSize = 10;
	let floorPosition = [0, -floorSize / 2 + 0.01, 0];
	let floorNode = null;

	let controllerTable = {};
	let boxTable = {};
	let movableBoxes = {};
	let loggedGamepadInfo = {};

	class XRControllerState {
	constructor(button_count) {
	this.buttons = [];
	for (let i = 0; i < button_count; ++i) {
	this.buttons.push(false);
	}
	}

	// returns array of buttons to fire events for
	update(gamepad) {
	let result = [];
	for (let i = 0; i < this.buttons.length; ++i) {
	let old_state = this.buttons[i];
	let new_state = gamepad.buttons[i].pressed;
	if (old_state && !new_state) {
	// Button which was previously pressed is not pressed anymore.
	result.push(i);
	}
	this.buttons[i] = new_state;
	}
	return result;
	}
	}

	class GamepadBoxSet {
	constructor(button_count, x, z) {
	this.box_list = [];
	this.box_state = [];
	for (let y = 1; y <= button_count; ++y) {
	addBox(x, y, z, 1, 0, 0, this.box_list);
	this.box_state.push(true);
	}
	}

	toggle(box_index) {
	let box = this.box_list[box_index];
	let uniforms = box.renderPrimitive.uniforms;
	if (this.box_state[box_index]) {
	uniforms.baseColorFactor.value = [0, 1, 0, 1];
	} else {
	uniforms.baseColorFactor.value = [1, 0, 0, 1];
	}
	this.box_state[box_index] = !this.box_state[box_index];
	}
	}

	class MovableBox {
	constructor(x, y, z, inv_speed) {
	this.box_list = [];
	addBox(x, y, z, 0, 0, 1, this.box_list);
	this.inv_speed = inv_speed;
	}

	update(dx, dz) {
	vec3.add(this.box_list[0].position, this.box_list[0].position, [dx / this.inv_speed, 0, dz / this.inv_speed]);
	}
	}

	function ProcessGamepad(gamepad, input_source) {
	let hand = input_source.handedness;
	if (!(hand in loggedGamepadInfo)) {
	loggedGamepadInfo[hand] = true;
	console.log(gamepad);
	}
	if (!(hand in movableBoxes)) {
	let x = 2;
	let z = 2;
	if (hand == "right") {
	x = -2;
	z = -2;
	}
	movableBoxes[hand] = new MovableBox(x, 2, z, 100);
	}
	if (!(hand in boxTable)) {
	let x = 1;
	let z = 1;
	if (hand == "right") {
	x = -1;
	z = -1;
	}
	boxTable[hand] = new GamepadBoxSet(gamepad.buttons.length, x, z);
	}
	if (!(hand in controllerTable)) {
	controllerTable[hand] = new XRControllerState(gamepad.buttons.length);
	}
	let buttons_fired = controllerTable[hand].update(gamepad);
	for (let button_index of buttons_fired) {
	console.log("controller for " + hand + " hand fired button " + button_index.toString());
	boxTable[hand].toggle(button_index);
	}
	for (let i = 0; i < gamepad.axes.length; i += 2) {
	let dx = gamepad.axes[i];
	let dy = gamepad.axes[i + 1];
	if (dx != 0 \|\| dy != 0) {
	movableBoxes[hand].update(dx, -dy);
	}
	}
	}

	function initXR() {
	xrButton = new XRDeviceButton({
	onRequestSession: onRequestSession,
	onEndSession: onEndSession,
	supportedSessionTypes: ['immersive-vr']
	});
	document.querySelector('header').appendChild(xrButton.domElement);

	if (navigator.xr) {
	const mode = 'inline';
	navigator.xr.requestSession(mode).then((session) => {
	session.mode = mode;
	onSessionStarted(session);
	});
	} else {
	initFallback();
	}
	}

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

	function addBox(x, y, z, r, g, b, box_list) {
	let boxBuilder = new BoxBuilder();
	boxBuilder.pushCube([0, 0, 0], 0.4);
	let boxPrimitive = boxBuilder.finishPrimitive(renderer);
	let boxMaterial = new PbrMaterial();
	boxMaterial.baseColorFactor.value = [r, g, b, 1.0];
	let boxRenderPrimitive = renderer.createRenderPrimitive(boxPrimitive, boxMaterial);
	let boxNode = new Node();
	boxNode.addRenderPrimitive(boxRenderPrimitive);
	// Marks the node as one that needs to be checked when hit testing.
	boxNode.selectable = true;
	box_list.push({
	node: boxNode,
	renderPrimitive: boxRenderPrimitive,
	position: [x, y, z]
	});
	scene.addNode(boxNode);
	}

	function initGL() {
	if (gl)
	return;

	gl = createWebGLContext({
	xrCompatible: true
	});

	renderer = new Renderer(gl);

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

	// Create several boxes to use for hit testing.
	addBox(-1.0, 1.6, -1.3, 1.0, 0.0, 0.0, boxes);
	addBox(0.0, 1.7, -1.5, 0.0, 1.0, 0.0, boxes);
	addBox(1.0, 1.6, -1.3, 0.0, 0.0, 1.0, boxes);

	addFloorBox();
	}

	function addFloorBox() {
	let boxBuilder = new BoxBuilder();
	boxBuilder.pushCube([0, 0, 0], floorSize);
	let boxPrimitive = boxBuilder.finishPrimitive(renderer);

	let boxMaterial = new PbrMaterial();
	boxMaterial.baseColorFactor.value = [0.3, 0.3, 0.3, 1.0];
	let boxRenderPrimitive = renderer.createRenderPrimitive(boxPrimitive, boxMaterial);

	floorNode = new Node();
	floorNode.addRenderPrimitive(boxRenderPrimitive);
	floorNode.selectable = true;
	scene.addNode(floorNode);
	mat4.identity(floorNode.matrix);
	mat4.translate(floorNode.matrix, floorNode.matrix, floorPosition);
	}

	function onRequestSession() {
	const mode = 'immersive-vr';
	navigator.xr.requestSession(mode).then((session) => {
	session.mode = mode;
	xrButton.setSession(session);
	onSessionStarted(session);
	});
	}

	function onSessionStarted(session) {
	if (!session.mode) {
	session.mode = 'inline';
	}

	session.addEventListener('end', onSessionEnded);

	// By listening for the 'select' event we can find out when the user has
	// performed some sort of primary input action and respond to it.
	session.addEventListener('select', onSelect);

	initGL();

	let outputCanvas = document.createElement('canvas');
	document.body.appendChild(outputCanvas);

	session.updateRenderState({
	baseLayer: new XRWebGLLayer(session, gl),
	outputContext: outputCanvas.getContext('xrpresent')
	});

	// Same logic for establishing a reference space as in room-scale.html
	session.requestReferenceSpace({ type: 'stationary', subtype: 'floor-level' }).then((refSpace) => {
	return refSpace;
	}, (e) => {
	if (!session.mode.startsWith('immersive')) {
	// If we're in inline mode, our underlying platform may not support
	// the stationary reference space, but an identity space is guaranteed.
	console.log("falling back to identity reference space");
	return session.requestReferenceSpace({ type: 'identity' });
	} else {
	throw e;
	}
	}).then((refSpace) => {
	if (session.mode.startsWith('immersive')) {
	xrImmersiveRefSpace = refSpace;
	} else {
	xrNonImmersiveRefSpace = refSpace;
	}

	session.requestAnimationFrame(onXRFrame);
	});
	}

	let playerInWorldSpaceOld = vec3.create();
	let playerInWorldSpaceNew = vec3.create();
	let playerOffsetInWorldSpaceOld = vec3.create();
	let playerOffsetInWorldSpaceNew = vec3.create();
	let rotationDeltaQuat = quat.create();

	function onSelect(ev) {
	let session = ev.frame.session;
	let refSpace = getRefSpace(session);

	let headPose = ev.frame.getPose(session.viewerSpace, refSpace);
	if (!headPose) return;

	// Get the position offset in world space from the tracking space origin
	// to the player's feet. The headPose position is the head position in world space.
	// Subtract the tracking space origin position in world space to get a relative world space vector.
	vec3.set(playerInWorldSpaceOld, headPose.transform.position.x, 0, headPose.transform.position.z);
	vec3.sub(playerOffsetInWorldSpaceOld, playerInWorldSpaceOld, trackingSpaceOriginInWorldSpace);

	// based on https://github.com/immersive-web/webxr/blob/master/input-explainer.md#targeting-ray-pose
	let inputSourcePose = ev.frame.getPose(ev.inputSource.targetRaySpace, refSpace);
	if (!inputSourcePose) {
	return;
	}

	vec3.copy(playerInWorldSpaceNew, playerInWorldSpaceOld);
	let rotationDelta = 0;

	// Hit test results can change teleport position and orientation.
	let targetRay = new XRRay(inputSourcePose.transform);
	let hitResult = scene.hitTest(targetRay)
	if (hitResult) {
	// Check to see if the hit result was one of our boxes.
	for (let i = 0; i < boxes.length; ++i) {
	let box = boxes[i];
	if (hitResult.node == box.node) {
	// Change the box color to something random.
	let uniforms = box.renderPrimitive.uniforms;
	uniforms.baseColorFactor.value = [Math.random(), Math.random(), Math.random(), 1.0];
	if (i == 0) {
	// turn left
	rotationDelta = 30;
	} else if (i == 1) {
	// reset heading by undoing the current rotation
	rotationDelta = -trackingSpaceHeadingDegrees;
	} else if (i == 2) {
	// turn right
	rotationDelta = -30;
	}
	console.log('rotate by', rotationDelta);
	}
	if (hitResult.node == floorNode) {
	// New position uses x/z values of the hit test result, keeping y at 0 (floor level)
	playerInWorldSpaceNew[0] = hitResult.intersection[0];
	playerInWorldSpaceNew[1] = 0;
	playerInWorldSpaceNew[2] = hitResult.intersection[2];
	console.log('teleport to', playerInWorldSpaceNew);
	}
	}
	}

	// Get the new world space offset vector from tracking space origin
	// to the player's feet, for the updated tracking space rotation.
	// Formally, this is the old world-space player offset transformed
	// into tracking space using the old originOffset's rotation component,
	// then transformed back into world space using the inverse of the
	// new originOffset. This simplifies to a rotation of the old player
	// offset by (new angle - old angle):
	// worldOffsetNew = inv(rot_of(originoffsetNew)) * rot_of(originoffsetOld) * worldOffsetOld
	// = inv(rotY(-angleNew)) * rotY(-angleOld) * worldOffsetOld
	// = rotY(angleNew) * rotY(-angleOld) * worldOffsetOld
	// = rotY(angleNew - angleOld) * worldOffsetOld
	quat.identity(rotationDeltaQuat);
	quat.rotateY(rotationDeltaQuat, rotationDeltaQuat, rotationDelta * Math.PI / 180);
	vec3.transformQuat(playerOffsetInWorldSpaceNew, playerOffsetInWorldSpaceOld, rotationDeltaQuat);
	trackingSpaceHeadingDegrees += rotationDelta;

	// Update tracking space origin so that origin + playerOffset == player location in world space
	vec3.sub(trackingSpaceOriginInWorldSpace, playerInWorldSpaceNew, playerOffsetInWorldSpaceNew);

	// Compute the origin offset
	quat.identity(invOrientation);
	quat.rotateY(invOrientation, invOrientation, -trackingSpaceHeadingDegrees * Math.PI / 180);
	vec3.negate(invPosition, trackingSpaceOriginInWorldSpace);
	vec3.transformQuat(invPosition, invPosition, invOrientation);
	let xform = new XRRigidTransform(
	{x: invPosition[0], y: invPosition[1], z: invPosition[2]},
	{x: invOrientation[0], y: invOrientation[1], z: invOrientation[2], w: invOrientation[3]});

	// Update refSpace to use a new originOffset with the teleported player position and orientation
	refSpace = refSpace.getOffsetReferenceSpace(xform);

	console.log('teleport to', trackingSpaceOriginInWorldSpace);
	}

	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);
	}
	}

	let invPosition = vec3.create();
	let invOrientation = quat.create();

	function getRefSpace(session) {
	return session.mode.startsWith('immersive') ?
	xrImmersiveRefSpace :
	xrNonImmersiveRefSpace;
	}

	function onXRFrame(time, frame) {
	let session = frame.session;
	let refSpace = getRefSpace(session);

	let pose = frame.getViewerPose(refSpace);
	scene.startFrame();
	session.requestAnimationFrame(onXRFrame);

	function updateBoxes(box_list, rotate) {
	// Update the matrix for each box
	for (let box of box_list) {
	let node = box.node;
	mat4.identity(node.matrix);
	mat4.translate(node.matrix, node.matrix, box.position);
	if (rotate) {
	mat4.rotateX(node.matrix, node.matrix, time/1000);
	mat4.rotateY(node.matrix, node.matrix, time/1500);
	}
	}
	}

	for (let source of session.inputSources) {
	let gamepad = source.gamepad;
	if (gamepad) {
	ProcessGamepad(gamepad, source);
	}
	}

	updateBoxes(boxes, true);
	for (let hand in boxTable) {
	updateBoxes(boxTable[hand].box_list, false);
	}
	for (let hand in movableBoxes) {
	updateBoxes(movableBoxes[hand].box_list, false);
	}

	// In this sample and most samples after it we'll use a helper function
	// to automatically add the right meshes for the session's input sources
	// each frame. This also does simple hit detection to position the
	// cursors correctly on the surface of selectable nodes.
	scene.updateInputSources(frame, refSpace);
	scene.drawXRFrame(frame, pose);
	scene.endFrame();
	}

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