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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>Framebuffer Scaling</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='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>Framebuffer Scaling</summary>
<p>
This sample demonstrates scaling the framebuffer used for a WebXR layer
at creation time to control the memory and fillrate required and improve
performance or quality as needed. (The system may clamp the actual
buffer sizes)
Framebuffer scaling should be used to make a performance/memory/quality
tradeoff for the lifetime of the session.
<a class="back" href="./">Back</a>
<br/>
<hr/>
<input id='framebufferScaleSelect' value='1.0' min='0.25' max='2.0' step='0.125' type='range'/><br/>
<span id='framebufferScaleLabel'></span>
</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();
let scaleSelect = document.getElementById('framebufferScaleSelect');
let scaleLabel = document.getElementById('framebufferScaleLabel');
function updateLabel() {
let value = parseFloat(scaleSelect.value);
let label = `Framebuffer scale: ${scaleSelect.value}`;
switch (value) {
case 0.5: label += ' - 50% recommended res'; break;
case 1.0: label += ' - Default, system recommendation'; break;
case 1.5: label += ' - 150% recommended res'; break;
case 2.0: label += ' - 200% recommended res'; break;
}
scaleLabel.innerHTML = label;
}
scaleSelect.addEventListener('change', updateLabel);
updateLabel();
// XR globals.
let xrButton = null;
let xrFrameOfRef = null;
// WebGL scene globals.
let gl = null;
let renderer = null;
let scene = new Scene();
scene.addNode(new CubeSeaNode());
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) {
// 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({ immersive: true, outputContext: ctx }).then(onSessionStarted);
}
function onSessionStarted(session) {
xrButton.setSession(session);
session.addEventListener('end', onSessionEnded);
if (!gl) {
gl = createWebGLContext({
compatibleXRDevice: session.device
});
// Set up a non-black clear color so that we can see if something renders wrong.
gl.clearColor(0.1, 0.2, 0.3, 1.0);
renderer = new Renderer(gl);
scene.setRenderer(renderer);
scene.inputRenderer.setControllerMesh(new Gltf2Node({url: 'media/gltf/controller/controller.gltf'}));
}
// This is the only meaningful change in this sample from xr-presentation.js.
// It sets a requested scale to be applied to the framebuffer created
// for the layer. The UA is allowed to ignore the request or adjust it
// as needed. The scale of the framebuffer cannot be changed after the
// layer is created, though the UA is allowed to resize the framebuffer
// at any time.
let scale = parseFloat(scaleSelect.value);
session.baseLayer = new XRWebGLLayer(session, gl, {
framebufferScaleFactor: scale
});
session.requestFrameOfReference('eye-level').then((frameOfRef) => {
xrFrameOfRef = frameOfRef;
session.requestAnimationFrame(onXRFrame);
});
}
function onEndSession(session) {
session.end();
}
function onSessionEnded(event) {
document.body.removeChild(document.querySelector('#mirror-canvas'));
xrButton.setSession(null);
gl = null;
}
function onXRFrame(t, frame) {
let session = frame.session;
let pose = frame.getDevicePose(xrFrameOfRef);
scene.startFrame();
session.requestAnimationFrame(onXRFrame);
scene.updateInputSources(frame, xrFrameOfRef);
scene.drawXRFrame(frame, pose);
scene.endFrame();
}
// Start the XR application.
initXR();
})();
</script>
</body>
</html>