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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>Mirroring</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/webxr-polyfill.js'></script>
<!--This script patches up around implementation differences in past browser versions
so that the samples can always be written against the most recent spec changes.
It won't be necessary after the API has been officially shipped for a bit.-->
<script src='js/webxr-version-shim.js'></script>
<script src='js/cottontail/build/cottontail.js'></script>
<script src='js/webxr-button.js'></script>
</head>
<body>
<header>
<details open>
<summary>Mirroring</summary>
<p>
This sample demonstrates how to present a simple WebGL scene to a
XRDevice while mirroring to a context. The scene is not rendered to
the page prior to XR presentation. Mirroring has no effect on mobile
or standalone devices.
<a class="back" href="./">Back</a>
</p>
</details>
</header>
<main style='text-align: center;'>
<p>Click 'Enter XR' to see content</p>
</main>
<script>
(function () {
'use strict';
// If requested, initialize the WebXR polyfill
if (QueryArgs.getBool('allowPolyfill', false)) {
var polyfill = new WebXRPolyfill();
}
// Apply the version shim after the polyfill is instantiated, to ensure
// that the polyfill also gets patched if necessary.
var versionShim = new WebXRVersionShim();
// XR globals.
let xrButton = null;
let xrFrameOfRef = null;
// WebGL scene globals.
let gl = null;
let renderer = null;
let scene = new Scene();
scene.addNode(new Gltf2Node({url: 'media/gltf/space/space.gltf'}));
scene.addNode(new SkyboxNode({url: 'media/textures/milky-way-4k.png'}));
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({immersive: true}).then(() => {
xrButton.setDevice(device);
});
});
}
}
function onRequestSession(device) {
// In order to mirror an exclusive session, we must provide
// an XRPresentationContext, which indicates the canvas that will
// contain results of the session's rendering.
let mirrorCanvas = document.createElement('canvas');
let ctx = mirrorCanvas.getContext('xrpresent');
mirrorCanvas.setAttribute('id', 'mirror-canvas');
// Add the canvas to the document.
document.body.appendChild(mirrorCanvas);
// Providing an outputContext when requesting an exclusive session
// indicates that it should be used as the mirror destination.
device.requestSession({
immersive: true,
outputContext: ctx
}).then(onSessionStarted);
}
function onSessionStarted(session) {
xrButton.setSession(session);
session.addEventListener('end', onSessionEnded);
if (!gl) {
gl = createWebGLContext({
compatibleXRDevice: session.device
});
renderer = new Renderer(gl);
scene.setRenderer(renderer);
}
session.baseLayer = new XRWebGLLayer(session, gl);
// Set the mirroring context to be the same size as one eye on the
// layer context.
let outputCanvas = document.querySelector('#mirror-canvas');
outputCanvas.width = session.baseLayer.framebufferWidth / 2;
outputCanvas.height = session.baseLayer.framebufferHeight;
session.requestFrameOfReference('eye-level').then((frameOfRef) => {
xrFrameOfRef = frameOfRef;
session.requestAnimationFrame(onXRFrame);
});
}
function onEndSession(session) {
session.end();
}
function onSessionEnded(event) {
xrButton.setSession(null);
gl = null;
// Remove the injected mirroring canvas from the DOM.
document.body.removeChild(document.querySelector('#mirror-canvas'));
}
function onXRFrame(t, frame) {
let session = frame.session;
scene.startFrame();
session.requestAnimationFrame(onXRFrame);
let pose = frame.getDevicePose(xrFrameOfRef);
if (pose) {
gl.bindFramebuffer(gl.FRAMEBUFFER, session.baseLayer.framebuffer);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
for (let view of frame.views) {
let viewport = session.baseLayer.getViewport(view);
gl.viewport(viewport.x, viewport.y,
viewport.width, viewport.height);
scene.draw(view.projectionMatrix, pose.getViewMatrix(view));
}
}
// Per-frame scene teardown. Nothing WebXR specific here.
scene.endFrame();
}
// Start the XR application.
initXR();
})();
</script>
</body>
</html>