testproject/input-tracking.html at master · lehoangphu/testproject · GitHub

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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,
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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'>
    <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate">
    <meta http-equiv="Pragma" content="no-cache">
    <meta http-equiv="Expires" content="0">

    <title>Input Tracking</title>

    <link href='css/common.css' rel='stylesheet'></link>

    <script src='js/cottontail/build/cottontail.js'></script>

    <script src='js/webxr-button.js'></script>
  </head>
  <body>
    <header>
      <details open>
        <summary>Input Tracking</summary>
        <p>
          This sample demonstrates basic tracking and rendering of
          XRInputSources. It does not respond to button presses or other
          controller interactions.
          <a class="back" href="./">Back</a>
        </p>
      </details>
    </header>
    <script>
      (function () {
      'use strict';

      // XR globals.
      let xrButton = null;
      let xrExclusiveFrameOfRef = null;
      let xrNonExclusiveFrameOfRef = null;

      // WebGL scene globals.
      let gl = null;
      let renderer = null;
      let scene = new Scene();
      scene.addNode(new Gltf2Node({url: 'media/gltf/cave/cave.gltf'}));
      scene.addNode(new SkyboxNode({url: 'media/textures/eilenriede-park-2k.png'}));
      scene.standingStats(true);

      function initXR() {
        xrButton = new XRDeviceButton({
          onRequestSession: onRequestSession,
          onEndSession: onEndSession
        });
        document.querySelector('header').appendChild(xrButton.domElement);

        if (navigator.xr) {
          navigator.xr.requestDevice().then((device) => {
            device.supportsSession({exclusive: true}).then(() => {
              xrButton.setDevice(device);
            });


          }).catch(() => {
            initFallback();
          });
        } else {
          initFallback();
        }
      }

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

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

        gl = createWebGLContext({
          compatibleXRDevice: compatibleDevice
        });

        renderer = new Renderer(gl);

        scene.setRenderer(renderer);

        // Loads a generic controller mesh.
        scene.inputRenderer.setControllerMesh(new Gltf2Node({url: 'media/gltf/controller/controller.gltf'}));
      }

      function onRequestSession(device) {
        // Set up a mirror canvas
        let mirrorCanvas = document.createElement('canvas');
        let ctx = mirrorCanvas.getContext('xrpresent');
        mirrorCanvas.setAttribute('id', 'mirror-canvas');
        document.body.appendChild(mirrorCanvas);

        device.requestSession({ exclusive: true }).then((session) => {
          xrButton.setSession(session);
          onSessionStarted(session);
        });
      }

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

        initGL(session.device);

        session.baseLayer = new XRWebGLLayer(session, gl);

        session.requestFrameOfReference('stage').then((frameOfRef) => {
          if (session.exclusive) {
            xrExclusiveFrameOfRef = frameOfRef;
          } else {
            xrNonExclusiveFrameOfRef = frameOfRef;
          }

          session.requestAnimationFrame(onXRFrame);
        });
      }

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

      function onSessionEnded(event) {
        if (event.session.exclusive) {
          document.body.removeChild(document.querySelector('#mirror-canvas'));
          xrButton.setSession(null);
        }
      }

      function updateInputSources(session, frame, frameOfRef) {
        let inputSources = session.getInputSources();

        for (let inputSource of inputSources) {
          let inputPose = frame.getInputPose(inputSource, frameOfRef);

          // We may not get a pose back in cases where the input source has lost
          // tracking or does not know where it is relative to the given frame
          // of reference.
          if (!inputPose) {
            continue;
          }

          if (inputPose.gripMatrix) {
            // If we have a grip matrix use it to render a mesh showing the
            // position of the controller.
            scene.inputRenderer.addController(inputPose.gripMatrix);
          }

          if (inputPose.pointerMatrix) {
            if (inputSource.pointerOrigin == 'hand') {
              // If we have a pointer matrix and the pointer origin is the users
              // hand (as opposed to their head or the screen) use it to render
              // a ray coming out of the input device to indicate the pointer
              // direction.
              scene.inputRenderer.addLaserPointer(inputPose.pointerMatrix);
            }

            // If we have a pointer matrix we can also use it to render a cursor
            // for both handheld and gaze-based input sources.

            // Statically render the cursor 2 meters down the ray since we're
            // not calculating any intersections in this sample.
            let cursorPos = vec3.fromValues(0, 0, -2.0);
            vec3.transformMat4(cursorPos, cursorPos, inputPose.pointerMatrix);

            scene.inputRenderer.addCursor(cursorPos);
          }
        }
      }

      function onXRFrame(t, frame) {
        let session = frame.session;
        let frameOfRef = session.exclusive ?
                         xrExclusiveFrameOfRef :
                         xrNonExclusiveFrameOfRef;
        let pose = frame.getDevicePose(frameOfRef);

        scene.startFrame();

        session.requestAnimationFrame(onXRFrame);

        updateInputSources(session, frame, frameOfRef);

        scene.drawXRFrame(frame, pose);

        scene.endFrame();
      }

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