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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 (For Chrome M76+), origin = storage.googleapis.com, expires = 2019-11-14 -->
<meta http-equiv="origin-trial" data-feature="WebXR Device API (For Chrome M76+)" data-expires="2019-11-14" content="AhHyLykky2f1ejF4oOiAcixprTboDwDMxntJkEYdXJY192BEsCTEYcwRa7X9TB6Qq3kEqcQsVbwjkZgh0V6FhQkAAABxeyJvcmlnaW4iOiJodHRwczovL3N0b3JhZ2UuZ29vZ2xlYXBpcy5jb206NDQzIiwiZmVhdHVyZSI6IldlYlhSRGV2aWNlTTc2IiwiZXhwaXJ5IjoxNTczNzY4NzU1LCJpc1N1YmRvbWFpbiI6dHJ1ZX0=">
<title>Multiple Magic Windows</title>
<link href='css/common.css' rel='stylesheet'></link>
<style>
#magic-window-container {
display: flex;
flex-direction: column;
}
#magic-window-container canvas {
position: relative;
box-sizing: border-box;
height: 200px;
border-width: 0px 5px 5px 5px;
border-style: solid;
border-color: white;
margin-left: auto;
margin-right: auto;
}
#magic-window-container canvas:first-child {
border-top-width: 5px;
}
</style>
<!--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/xrray-polyfill.js' type='module'></script>
<script src='js/webxr-polyfill.js'></script>
</head>
<body>
<header>
<details open>
<summary>Multiple Magic Windows</summary>
<p>
This sample demonstrates use of multiple non-immersive XRSessions to present
'Magic Window' content from multiple scenes on the same page. The viewer pose
can be adjusted by clicking and dragging with mouse or touch.
</p>
<p>
<a class="back" href="./index.html">Back</a><br>
</p>
</details>
</header>
<div id="magic-window-container"></div>
<script type="module">
import {Scene} from './js/cottontail/src/scenes/scene.js';
import {Renderer, createWebGLContext} from './js/cottontail/src/core/renderer.js';
import {Gltf2Node} from './js/cottontail/src/nodes/gltf2.js';
import {QueryArgs} from './js/cottontail/src/util/query-args.js';
import {SkyboxNode} from './js/cottontail/src/nodes/skybox.js';
import {mat4, vec3, quat} from './js/cottontail/src/math/gl-matrix.js';
// If requested, initialize the WebXR polyfill
if (QueryArgs.getBool('allowPolyfill', false)) {
var polyfill = new WebXRPolyfill();
}
function initXR(scene, lookOffset) {
// Keep track of contextual data for each session (touches, reference space, renderer, etc)
let sessionCtx = {
// Touch-related state so that users can touch and drag on
// the canvas to adjust the viewer pose in an inline session.
lookOffset: lookOffset || { x: 0, y: 0, z: 0 },
lookYaw: 0,
lookPitch: 0,
primaryTouch: null,
prevTouchX: null,
prevTouchY: null,
currentTouches: new Set(),
// Rendering and scene-related state.
scene: scene,
refSpace: null,
gl: null,
renderer: null,
};
// Pick an arbitrary device for the magic window content and start
// up a non-immersive non-local session.
requestSession(sessionCtx)
.then(session => {
// Once the initial inline session has been set up, create a session
// supporting the local reference space when we have user activation.
sessionCtx.gl.canvas.addEventListener('touchend', () => {
session.end().then(() => requestSession(sessionCtx, {optionalFeatures: ['local']}))
}, { once: true });
});
}
function requestSession(sessionCtx, options) {
if (navigator.xr) {
return navigator.xr.requestSession('inline', options).then(session => {
return onSessionStarted(sessionCtx, session);
});
} else {
return Promise.reject();
}
}
function onSessionStarted(sessionCtx, session) {
if (!sessionCtx.gl) {
sessionCtx.gl = createWebGLContext({
xrCompatible: true
});
document.getElementById("magic-window-container").appendChild(sessionCtx.gl.canvas);
function onResize () {
sessionCtx.gl.canvas.width = (sessionCtx.gl.canvas.offsetWidth * window.devicePixelRatio);
sessionCtx.gl.canvas.height = (sessionCtx.gl.canvas.offsetHeight * window.devicePixelRatio);
}
window.addEventListener('resize', onResize);
onResize();
sessionCtx.renderer = new Renderer(sessionCtx.gl);
sessionCtx.scene.setRenderer(sessionCtx.renderer);
// Make the canvas listen for touch events so that we can adjust the
// viewer pose accordingly in inline sessions.
sessionCtx.gl.canvas.addEventListener("touchstart", ev => onTouchStart(sessionCtx, ev));
sessionCtx.gl.canvas.addEventListener("touchend", ev => onTouchEnd(sessionCtx, ev));
sessionCtx.gl.canvas.addEventListener("touchcancel", ev => onTouchCancel(sessionCtx, ev));
sessionCtx.gl.canvas.addEventListener("touchmove", ev => onTouchMove(sessionCtx, ev));
sessionCtx.gl.canvas.addEventListener("mousemove", ev => onMouseMove(sessionCtx, ev));
}
session.updateRenderState({
baseLayer: new XRWebGLLayer(session, sessionCtx.gl)
});
// Try to get a local reference space, if possible.
// Otherwise, get a viewer reference space.
session.requestReferenceSpace('local')
.catch(() => session.requestReferenceSpace('viewer'))
.then(refSpace => {
sessionCtx.refSpace = refSpace;
session.requestAnimationFrame((t, frame) => onXRFrame(sessionCtx, t, frame));
});
return session;
}
// Allow the user to click and drag the mouse (or touch and drag the
// screen on handheld devices) to adjust the viewer pose for inline
// sessions.
const lookSpeed = 0.0025;
function processMoveEvent(sessionCtx, dx, dy) {
sessionCtx.lookYaw += dx * lookSpeed;
sessionCtx.lookPitch += dy * lookSpeed;
if (sessionCtx.lookPitch < -Math.PI*0.5)
sessionCtx.lookPitch = -Math.PI*0.5;
if (sessionCtx.lookPitch > Math.PI*0.5)
sessionCtx.lookPitch = Math.PI*0.5;
}
function onMouseMove(sessionCtx, event) {
// Only rotate when the left button is pressed
if (event.buttons & 1) {
processMoveEvent(sessionCtx, event.movementX, event.movementY);
}
}
// Keep track of all active touches, but only use the first touch to
// adjust the viewer pose.
function onTouchStart(sessionCtx, event) {
for (const touch of event.changedTouches) {
const id = touch.identifier;
if (sessionCtx.primaryTouch == undefined) {
sessionCtx.primaryTouch = id;
sessionCtx.prevTouchX = touch.pageX;
sessionCtx.prevTouchY = touch.pageY;
}
sessionCtx.currentTouches.add(id);
}
}
// Update the set of active touches now that one or more touches finished.
// If the primary touch just finished, update the viewer pose based on the
// final touch movement.
function onTouchEnd(sessionCtx, event) {
for (const touch of event.changedTouches) {
const id = touch.identifier;
if (id == sessionCtx.primaryTouch) {
const dx = touch.pageX - sessionCtx.prevTouchX;
const dy = touch.pageY - sessionCtx.prevTouchY;
processMoveEvent(sessionCtx, dx, dy);
sessionCtx.primaryTouch = undefined;
}
sessionCtx.currentTouches.delete(id);
}
}
// Update the set of active touches now that one or more touches was
// cancelled. Don't update the viewer pose when the primary touch was
// cancelled.
function onTouchCancel(sessionCtx, event) {
for (const touch of event.changedTouches) {
const id = touch.identifier;
if (id == sessionCtx.primaryTouch) {
sessionCtx.primaryTouch = undefined;
}
sessionCtx.currentTouches.delete(id);
}
}
// Only use the delta between the most recent and previous events for the
// primary touch. Ignore the other touches.
function onTouchMove(sessionCtx, event) {
for (const touch of event.changedTouches) {
const id = touch.identifier;
if (id == sessionCtx.primaryTouch) {
const dx = touch.pageX - sessionCtx.prevTouchX;
const dy = touch.pageY - sessionCtx.prevTouchY;
processMoveEvent(sessionCtx, dx, dy);
sessionCtx.prevTouchX = touch.pageX;
sessionCtx.prevTouchY = touch.pageY;
}
}
}
// XRReferenceSpace offset is immutable, so return a new reference space
// that has an updated orientation.
function getAdjustedRefSpace(sessionCtx, refSpace) {
// Represent the rotational component of the reference space as a
// quaternion.
let invOrientation = quat.create();
quat.rotateX(invOrientation, invOrientation, -sessionCtx.lookPitch);
quat.rotateY(invOrientation, invOrientation, -sessionCtx.lookYaw);
// Rotate the camera based on lookYaw and lookPitch
let xform = new XRRigidTransform(
{x: 0, y: 0, z: 0},
{x: invOrientation[0], y: invOrientation[1], z: invOrientation[2], w: invOrientation[3]});
refSpace = refSpace.getOffsetReferenceSpace(xform);
// Translate the camera based on lookOffset
xform = new XRRigidTransform(
sessionCtx.lookOffset,
{x: 0, y: 0, z: 0, w: 1});
return refSpace.getOffsetReferenceSpace(xform);
}
// Called every time a XRSession requests that a new frame be drawn.
function onXRFrame(sessionCtx, t, frame) {
let session = frame.session;
// Per-frame scene setup. Nothing WebXR specific here.
sessionCtx.scene.startFrame();
// Inform the session that we're ready for the next frame.
session.requestAnimationFrame((t, frame) => onXRFrame(sessionCtx, t, frame));
// Account for the click-and-drag mouse movement or touch movement when
// calculating the viewer pose for inline sessions.
let refSpace = getAdjustedRefSpace(sessionCtx, sessionCtx.refSpace);
let pose = frame.getViewerPose(refSpace);
// In most other samples, these rendering details will be handled by
// cottontail by calling |scene.drawXRFrame|.
if (pose) {
sessionCtx.gl.bindFramebuffer(sessionCtx.gl.FRAMEBUFFER, session.renderState.baseLayer.framebuffer);
sessionCtx.gl.clear(sessionCtx.gl.COLOR_BUFFER_BIT | sessionCtx.gl.DEPTH_BUFFER_BIT);
// Loop through each of the views reported by the frame and draw them
// into the corresponding viewport.
for (let view of pose.views) {
let viewport = session.renderState.baseLayer.getViewport(view);
sessionCtx.gl.viewport(viewport.x, viewport.y, viewport.width, viewport.height);
// Draw this view of the scene. What happens in this function really
// isn't all that important. What is important is that it renders
// into the XRWebGLLayer's framebuffer, using the viewport into that
// framebuffer reported by the current view, and using the
// projection and view matrices from the current view and pose.
// We bound the framebuffer and viewport up above, and are passing
// in the appropriate matrices here to be used when rendering.
sessionCtx.scene.draw(view.projectionMatrix, view.transform.inverse.matrix);
}
} else {
// There's several options for handling cases where no pose is given.
// The simplest, which these samples opt for, is to simply not draw
// anything. That way the device will continue to show the last frame
// drawn, possibly even with re-projection. Alternately you could
// re-draw the scene again with the last known good pose (which is now
// likely to be wrong), clear to black, or draw a head-locked message
// for the user indicating that they should try to get back to an area
// with better tracking. In all cases it's possible that the device
// may override what is drawn here to show the user it's own error
// message, so it should not be anything critical to the application's
// use.
}
// Per-frame scene tear-down. Nothing WebXR specific here.
sessionCtx.scene.endFrame();
}
// Create two XR Sessions
let scene1 = new Scene();
scene1.addNode(new Gltf2Node({url: '../media/gltf/space/space.gltf'}));
scene1.addNode(new SkyboxNode({url: '../media/textures/milky-way-4k.png'}));
initXR(scene1);
let scene2 = new Scene();
scene2.addNode(new Gltf2Node({url: '../media/gltf/cave/cave.gltf'}))
scene2.addNode(new SkyboxNode({url: '../media/textures/eilenriede-park-2k.png'}))
initXR(scene2, {x: 0, y: -1.5, z: 0});
</script>
</body>
</html>
|
