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+<!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'>
+    <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>Input Selection</title>
+  </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 {WebXRButton} from './js/util/webxr-button.js';
+      import {Scene} from './js/render/scenes/scene.js';
+      import {Renderer, createWebGLContext} from './js/render/core/renderer.js';
+      import {Node} from './js/render/core/node.js';
+      import {Gltf2Node} from './js/render/nodes/gltf2.js';
+      import {SkyboxNode} from './js/render/nodes/skybox.js';
+      import {BoxBuilder} from './js/render/geometry/box-builder.js';
+      import {PbrMaterial} from './js/render/materials/pbr.js';
+      import {vec3, mat4} from './js/render/math/gl-matrix.js';
+      import {InlineViewerHelper} from './js/util/inline-viewer-helper.js';
+      import {QueryArgs} from './js/util/query-args.js';
+      import {Ray} from './js/render/math/ray.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 xrImmersiveRefSpace = null;
+      let inlineViewerHelper = null;
+
+      const frequency = 200; // Hz
+      const amplitude = 1;
+      const modulationFrequency = 1; // Hz
+      const modulationAmplitude = 0.8;
+      const sampleRate = 3000; // Hz
+      const duration = 8; // seconds
+
+      const bufferLength = sampleRate * duration;
+      const buffer = new Float32Array(bufferLength);
+
+      for (let i = 0; i < bufferLength; i++) {
+        const t = i / sampleRate; // time in seconds
+        const modulation = modulationAmplitude * Math.sin(2 * Math.PI * modulationFrequency * t);
+        const value = amplitude * modulation * Math.sin(2 * Math.PI * frequency * t);
+        buffer[i] = value;
+      }
+
+      let yodelBuffer;
+      const URL = 'beat.mp3';
+      const context = new AudioContext();
+
+      window.fetch(URL)
+        .then(response => response.arrayBuffer())
+        .then(arrayBuffer => context.decodeAudioData(arrayBuffer))
+        .then(audioBuffer => {
+          yodelBuffer = audioBuffer;
+        });
+      // WebGL scene globals.
+      let gl = null;
+      let renderer = null;
+      let scene = new Scene();
+      scene.addNode(new Gltf2Node({url: 'media/gltf/cube-room/cube-room.gltf'}));
+      scene.standingStats(true);
+
+      let boxes = [];
+      let currently_selected_boxes = [null, null];
+      let currently_grabbed_boxes = [null, 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;
+          });
+
+          navigator.xr.requestSession('inline').then(onSessionStarted);
+        }
+      }
+
+      function initGL() {
+        if (gl)
+          return;
+
+        gl = createWebGLContext({
+          xrCompatible: true
+        });
+        document.body.appendChild(gl.canvas);
+
+        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);
+
+        // Create several boxes to use for hit testing.
+        let boxBuilder = new BoxBuilder();
+        boxBuilder.pushCube([0, 0, 0], 0.4);
+        let boxPrimitive = boxBuilder.finishPrimitive(renderer);
+
+        function addBox(x, y, z, r, g, b) {
+          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;
+          boxes.push({
+            node: boxNode,
+            renderPrimitive: boxRenderPrimitive,
+            position: [x, y, z],
+            scale: [1, 1, 1],
+          });
+          scene.addNode(boxNode);
+        }
+
+        addBox(-1.0, 1.6, -1.3, 1.0, 0.0, 0.0);
+        addBox(0.0, 1.7, -1.5, 0.0, 1.0, 0.0);
+        addBox(1.0, 1.6, -1.3, 0.0, 0.0, 1.0);
+      }
+
+      function onRequestSession() {
+        return navigator.xr.requestSession('immersive-vr', {
+            requiredFeatures: ['local-floor']
+        }).then((session) => {
+          xrButton.setSession(session);
+          session.isImmersive = true;
+          onSessionStarted(session);
+        });
+      }
+
+      function onSessionStarted(session) {
+        session.addEventListener('end', onSessionEnded);
+
+        session.addEventListener('selectstart', onSelectStart);
+        session.addEventListener('selectend', onSelectEnd);
+        // 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);
+
+        session.addEventListener('squeezestart', onSqueezeStart);
+        session.addEventListener('squeezeend', onSqueezeEnd);
+        session.addEventListener('squeeze', onSqueeze);
+
+        initGL();
+
+        // This and all future samples that visualize controllers will use this
+        // convenience method to listen for changes to the active XRInputSources
+        // and load the right meshes based on the profiles array.
+        scene.inputRenderer.useProfileControllerMeshes(session);
+
+        let glLayer = new XRWebGLLayer(session, gl);
+        session.updateRenderState({ baseLayer: glLayer });
+
+        let refSpaceType = session.isImmersive ? 'local-floor' : 'viewer';
+        session.requestReferenceSpace(refSpaceType).then((refSpace) => {
+          if (session.isImmersive) {
+            xrImmersiveRefSpace = refSpace;
+          } else {
+            inlineViewerHelper = new InlineViewerHelper(gl.canvas, refSpace);
+            inlineViewerHelper.setHeight(1.6);
+          }
+          session.requestAnimationFrame(onXRFrame);
+        });
+      }
+
+      function onSelectStart(ev) {
+        console.log("selectstart " + currently_selected_boxes);
+        let refSpace = ev.frame.session.isImmersive ?
+                         xrImmersiveRefSpace :
+                         inlineViewerHelper.referenceSpace;
+        let targetRayPose = ev.frame.getPose(ev.inputSource.targetRaySpace, refSpace);
+        if (!targetRayPose) {
+          return;
+        }
+
+        let hitResult = scene.hitTest(targetRayPose.transform);
+        if (hitResult) {
+          // Check to see if the hit result was one of our boxes.
+          for (let box of boxes) {
+            if (hitResult.node == box.node) {
+              let i = (ev.inputSource.handedness == "left") ? 0 : 1;
+              let audio_buffer = new AudioBuffer({'sampleRate': 3000, 'length': buffer.byteLength});
+              audio_buffer.copyToChannel(buffer, 0);
+              ev.inputSource.gamepad.hapticActuators[0].playPCM(audio_buffer);
+              currently_selected_boxes[i] = box;
+              box.scale = [1.25, 1.25, 1.25];
+              box.selected = false;
+            }
+          }
+        }
+      }
+      function onSelectEnd(ev) {
+        let i = (ev.inputSource.handedness == "left") ? 0 : 1;
+        let currently_selected_box = currently_selected_boxes[i];
+        console.log("selectend " + currently_selected_box);
+        if (currently_selected_box != null) {
+          if (currently_selected_box.selected) {
+            // it is expected that the scale is 0.75 (see onSelectStart). This should make the scale 1.0
+            vec3.add(currently_selected_box.scale, currently_selected_box.scale, [0.25, 0.25, 0.25]);
+            currently_selected_box.selected = false;
+          } else {
+            // there was no 'select' event: final cube's size will be smaller.
+            currently_selected_box.scale = [0.75, 0.75, 0.75];
+          }
+          currently_selected_boxes[i] = null;
+        }
+      }
+      function onSelect(ev) {
+        let i = (ev.inputSource.handedness == "left") ? 0 : 1;
+        let currently_selected_box = currently_selected_boxes[i];
+        console.log("select " + currently_selected_box);
+        if (currently_selected_box != null) {
+          // Change the box color to something random.
+          let uniforms = currently_selected_box.renderPrimitive.uniforms;
+          uniforms.baseColorFactor.value = [Math.random(), Math.random(), Math.random(), 1.0];
+          // it is expected that the scale is 1.25 (see onSelectStart). This should make the scale 0.75
+          vec3.add(currently_selected_box.scale, currently_selected_box.scale, [-0.5, -0.5, -0.5]);
+          currently_selected_box.selected = true;
+        }
+      }
+
+      function onSqueezeStart(ev) {
+        console.log("squeezestart " + currently_grabbed_boxes);
+        let refSpace = ev.frame.session.isImmersive ?
+                         xrImmersiveRefSpace :
+                         inlineViewerHelper.referenceSpace;
+        let targetRayPose = ev.frame.getPose(ev.inputSource.targetRaySpace, refSpace);
+        if (!targetRayPose) {
+          return;
+        }
+
+        let hitResult = scene.hitTest(targetRayPose.transform);
+        if (hitResult) {
+          // Check to see if the hit result was one of our boxes.
+          for (let box of boxes) {
+            if (hitResult.node == box.node && !box.grabbed) {
+              let i = (ev.inputSource.handedness == "left") ? 0 : 1;
+              currently_grabbed_boxes[i] = box;
+              box.scale = [0.1, 0.1, 0.1];
+              box.originalPos = box.position;
+              box.grabbed = true;
+            }
+          }
+        }
+      }
+      function onSqueezeEnd(ev) {
+        let i = (ev.inputSource.handedness == "left") ? 0 : 1;
+        let currently_grabbed_box = currently_grabbed_boxes[i];
+        console.log("squeezeend " + currently_grabbed_box);
+        if (currently_grabbed_box != null && currently_grabbed_box.grabbed) {
+          // the scale of 'grabbed' box is 0.1. Restore the original scale.
+          vec3.add(currently_grabbed_box.scale, currently_grabbed_box.scale, [1, 1, 1]);
+          currently_grabbed_box.position = currently_grabbed_box.originalPos;
+          currently_grabbed_box.grabbed = false;
+          currently_grabbed_boxes[i] = null;
+        }
+      }
+      function onSqueeze(ev) {
+        let i = (ev.inputSource.handedness == "left") ? 0 : 1;
+        let currently_grabbed_box = currently_grabbed_boxes[i];
+        console.log("squeeze " + currently_grabbed_box);
+        if (currently_grabbed_box != null && currently_grabbed_box.grabbed) {
+          // Change the box color to something random, so we can see that 'squeeze' was invoked.
+          let uniforms = currently_grabbed_box.renderPrimitive.uniforms;
+          uniforms.baseColorFactor.value = [Math.random(), Math.random(), Math.random(), 1.0];
+        }
+      }
+
+      function onEndSession(session) {
+        session.end();
+      }
+
+      function onSessionEnded(event) {
+        if (event.session.isImmersive) {
+          xrButton.setSession(null);
+        }
+      }
+
+      function onXRFrame(time, frame) {
+        let session = frame.session;
+        let refSpace = session.isImmersive ?
+                         xrImmersiveRefSpace :
+                         inlineViewerHelper.referenceSpace;
+        let pose = frame.getViewerPose(refSpace);
+
+        scene.startFrame();
+
+        session.requestAnimationFrame(onXRFrame);
+
+        // check if we can move grabbed objects
+        for (let inputSource of frame.session.inputSources) {
+          let targetRayPose = frame.getPose(inputSource.targetRaySpace, refSpace);
+
+          if (!targetRayPose) {
+            continue;
+          }
+          let i = (inputSource.handedness == "left") ? 0 : 1;
+          if (currently_grabbed_boxes[i] != null && currently_grabbed_boxes[i].grabbed) {
+            let targetRay = new Ray(targetRayPose.transform.matrix);
+            let grabDistance = 0.1; // 10 cm
+            let grabPos = vec3.fromValues(
+                targetRay.origin[0], //x
+                targetRay.origin[1], //y
+                targetRay.origin[2]  //z
+                );
+            vec3.add(grabPos, grabPos, [
+                targetRay.direction[0] * grabDistance,
+                targetRay.direction[1] * grabDistance + 0.06, // 6 cm up to avoid collision with a ray
+                targetRay.direction[2] * grabDistance,
+                ]);
+            currently_grabbed_boxes[i].position = grabPos;
+          }
+        }
+
+        // Update the matrix for each box
+        for (let box of boxes) {
+          let node = box.node;
+          mat4.identity(node.matrix);
+          mat4.translate(node.matrix, node.matrix, box.position);
+          mat4.rotateX(node.matrix, node.matrix, time/1000);
+          mat4.rotateY(node.matrix, node.matrix, time/1500);
+          mat4.scale(node.matrix, node.matrix, box.scale);
+        }
+
+        // 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>
