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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.
-->
<!--
This is a somewhat modified version of the xr-barebones page, which adds a
rotating color square to the DOM content as well as adding support to capture
and show the contents of the page via the WebRTC APIs.
-->
<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'>
<title>Tab Capture Test</title>
<link href='../css/common.css' rel='stylesheet'></link>
<style>
#session-info {
font-weight: bold;
font-family: monospace;
}
/* Override the default canvas styling which would make the canvas full
screen and on top of everything... */
#colorsquare {
position: relative;
z-index: auto;
width: 100px;
height: 100px;
left: auto;
top: auto;
right: auto;
bottom: auto;
margin: auto;
}
</style>
</head>
<body>
<header>
<details open>
<summary>Tab Capture Test</summary>
<p>
This sample demonstrates a simple AR page which uses DOM Overlay to
help show a capture of the current tab.
<a class="back" href="./index.html">Back</a>
</p>
<div id="session-info"></div>
<div id="warning-zone"></div>
<button id="xr-button" class="barebones-button" disabled>XR not found</button>
<button id="capture-button" class="barebones-button">Start Screen Capture</button>
<video id="capture-video" autoplay playsinline muted height=100></video>
</details>
</header>
<main style='text-align: center;'>
<p>Click 'Enter AR' to see content</p>
<canvas id="colorsquare"/>
</main>
<script type="module">
// XR globals.
const xrButton = document.getElementById('xr-button');
let xrSession = null;
let xrRefSpace = null;
// getDisplayMedia globals.
const captureButton = document.getElementById('capture-button');
const video = document.getElementById('capture-video');
let videoStream = null;
// WebGL scene globals.
let gl = null;
function checkSupportedState() {
navigator.xr.isSessionSupported('immersive-ar').then((supported) => {
if (supported) {
xrButton.innerHTML = 'Enter AR';
} else {
xrButton.innerHTML = 'AR not found';
}
xrButton.disabled = !supported;
});
}
function initXR() {
if (!window.isSecureContext) {
document.getElementById("warning-zone").innerText =
"WebXR unavailable due to insecure context";
}
if (navigator.xr) {
xrButton.addEventListener('click', onXRButtonClicked);
captureButton.addEventListener('click', oncaptureButtonClicked);
navigator.xr.addEventListener('devicechange', checkSupportedState);
checkSupportedState();
} else {
document.getElementById("warning-zone").innerText =
"WebXR unavailable.";
}
}
function oncaptureButtonClicked() {
if (!videoStream) {
navigator.mediaDevices.getDisplayMedia({video: true, preferCurrentTab: true})
.then(onCaptureSuccess, onCaptureError);
} else {
// Before we stop the tracks we need to cleanup the state of anything
// that might be using them; so we'll call onCaptureEnded. However,
// this also clears the videoStream variable, so cache the tracks that
// we need to stop ahead of time.
const tracks = videoStream.getTracks();
onCaptureEnded();
tracks.forEach(track => track.stop());
}
}
function onCaptureSuccess(stream) {
videoStream = stream;
video.srcObject = stream;
videoStream.getVideoTracks()[0].addEventListener('ended', onCaptureEnded);
captureButton.innerHTML = 'Stop Screen Capture';
}
function onCaptureEnded() {
video.pause();
video.srcObject = null;
videoStream = null;
captureButton.innerHTML = 'Start Screen Capture';
}
function onCaptureError(ex) {
document.getElementById("warning-zone").innerText =
"Failed to get display media.";
console.error(ex.message);
}
function onXRButtonClicked() {
if (!xrSession) {
// Ask for an optional DOM Overlay, see https://immersive-web.github.io/dom-overlays/
// Use BODY as the root element.
navigator.xr.requestSession('immersive-ar', {
optionalFeatures: ['dom-overlay'],
domOverlay: {root: document.body}
}).then(onSessionStarted, onRequestSessionError);
} else {
xrSession.end();
}
}
function onSessionStarted(session) {
xrSession = session;
xrButton.innerHTML = 'Exit AR';
// Show which type of DOM Overlay got enabled (if any)
document.getElementById('session-info').innerHTML = 'DOM Overlay type: ' + session.domOverlayState.type;
session.addEventListener('end', onSessionEnded);
const canvas = document.createElement('canvas');
gl = canvas.getContext('webgl', {
xrCompatible: true
});
session.updateRenderState({ baseLayer: new XRWebGLLayer(session, gl) });
session.requestReferenceSpace('local').then((refSpace) => {
xrRefSpace = refSpace;
session.requestAnimationFrame(onXRFrame);
});
}
function onRequestSessionError(ex) {
alert("Failed to start immersive AR session.");
console.error(ex.message);
}
function onEndSession(session) {
session.end();
}
function onSessionEnded(event) {
xrSession = null;
xrButton.innerHTML = 'Enter AR';
document.getElementById('session-info').innerHTML = '';
gl = null;
}
function onXRFrame(t, frame) {
const session = frame.session;
session.requestAnimationFrame(onXRFrame);
const pose = frame.getViewerPose(xrRefSpace);
if (pose) {
gl.bindFramebuffer(gl.FRAMEBUFFER, session.renderState.baseLayer.framebuffer);
// Update the clear color so that we can observe the color in the
// headset changing over time. Use a scissor rectangle to keep the AR
// scene visible.
const width = session.renderState.baseLayer.framebufferWidth;
const height = session.renderState.baseLayer.framebufferHeight;
gl.enable(gl.SCISSOR_TEST);
gl.scissor(width / 4, height / 4, width / 2, height / 2);
const time = Date.now();
gl.clearColor(Math.cos(time / 2000), Math.cos(time / 4000), Math.cos(time / 6000), 0.5);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
}
}
function initDOMColorSquare() {
// Add a box to the DOM content that cycles colors so we can ensure that
// the DOMOverlay is actually being live updated.
const colorSquare = document.getElementById('colorsquare');
const ctx = colorSquare.getContext('2d');
function paintCanvas() {
const time = Date.now();
const r = (Math.abs(Math.cos(time/2000)) * 255);
const g = (Math.abs(Math.cos(time/4000)) * 255);
const b = (Math.abs(Math.cos(time/6000)) * 255);
const color = "rgb("+r+","+g+","+b+")";
ctx.fillStyle = color;
ctx.fillRect(0,0, colorSquare.width, colorSquare.height);
}
window.setInterval(paintCanvas, 32);
}
initDOMColorSquare();
initXR();
</script>
</body>
</html>
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