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viewport-scaling.html
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viewport-scaling.html
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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'>
<!-- 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>Viewport 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='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>Viewport Scaling</summary>
<p>
This sample demonstrates scaling the viewports used for a WebXR layer
at runtime to dynamically adjust the fillrate required and improve
performance or quality as needed.
Viewport scaling should be used to make a performance/quality tradeoff
in response to realtime performance monitoring.
<a class="back" href="./">Back</a>
</p>
</details>
</header>
<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 xrImmersiveFrameOfRef = null;
let xrNonImmersiveFrameOfRef = null;
// WebGL scene globals.
let gl = null;
let renderer = null;
let scene = new Scene();
scene.addNode(new CubeSeaNode());
let resolutionMultiplier = 1.0;
let lastAdjustment = Date.now()-1000;
// Called in the render loop.
function adjustViewportScale(session) {
// Update the viewport scale every tenth of a second.
let t = Date.now();
if (t - lastAdjustment < 100)
return;
lastAdjustment = t;
// Modify the scale over time on a sin wave. In the real world this
// would probably be based on scene complexity.
// Oscillates between 1.0 to 0.5.
resolutionMultiplier = (Math.sin(t / 1000) * 0.25) + 0.75;
// This is the only new XRSession call in this sample. It sets a
// requested scale to be applied to the viewports reported for each
// XRView. The UA is allowed to ignore the request or adjust it as
// needed. If the scaling request is honored it will take effect on the
// *next* frame, not the current one.
session.baseLayer.requestViewportScaling(resolutionMultiplier);
}
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);
});
let outputCanvas = document.createElement('canvas');
let ctx = outputCanvas.getContext('xrpresent');
device.requestSession({outputContext: ctx})
.then((session) => {
document.body.appendChild(outputCanvas);
onSessionStarted(session);
});
}).catch(() => {
initFallback();
});
} else {
initFallback();
}
}
function initFallback() {
initGL();
document.body.appendChild(gl.canvas);
let fallbackHelper = new FallbackHelper(scene, gl);
}
function initGL(compatibleDevice) {
if (gl)
return;
gl = createWebGLContext({
compatibleXRDevice: compatibleDevice
});
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'}));
}
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((session) => {
xrButton.setSession(session);
onSessionStarted(session);
});
}
function onSessionStarted(session) {
session.addEventListener('end', onSessionEnded);
initGL(session.device);
session.baseLayer = new XRWebGLLayer(session, gl);
session.requestFrameOfReference('eye-level').then((frameOfRef) => {
if (session.immersive) {
xrImmersiveFrameOfRef = frameOfRef;
} else {
xrNonImmersiveFrameOfRef = frameOfRef;
}
session.requestAnimationFrame(onXRFrame);
});
}
function onEndSession(session) {
session.end();
}
function onSessionEnded(event) {
if (event.session.immersive) {
document.body.removeChild(document.querySelector('#mirror-canvas'));
xrButton.setSession(null);
}
}
function onXRFrame(t, frame) {
let session = frame.session;
let frameOfRef = session.immersive ?
xrImmersiveFrameOfRef :
xrNonImmersiveFrameOfRef;
let pose = frame.getViewerPose(frameOfRef);
scene.startFrame();
// Adjust the viewports if needed.
adjustViewportScale(session);
session.requestAnimationFrame(onXRFrame);
scene.updateInputSources(frame, frameOfRef);
scene.drawXRFrame(frame, pose);
scene.endFrame();
}
// Start the XR application.
initXR();
})();
</script>
</body>
</html>