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input-selection.html
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input-selection.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'>
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate">
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Expires" content="0">
<title>Input Selection</title>
<link href='css/common.css' rel='stylesheet'></link>
<script src='js/cottontail/build/cottontail.js'></script>
<script src='js/webxr-button.js'></script>
</head>
<body>
<header>
<details open>
<summary>Input Selection</summary>
<p>
This sample demonstrates handling 'select' events generated by
XRInputSources to create clickable objects in the scene.
<a class="back" href="./">Back</a>
</p>
</details>
</header>
<script>
(function () {
'use strict';
// XR globals.
let xrButton = null;
let xrExclusiveFrameOfRef = null;
let xrNonExclusiveFrameOfRef = null;
// WebGL scene globals.
let gl = null;
let renderer = null;
let scene = new Scene();
scene.addNode(new Gltf2Node({url: 'media/gltf/cube-room/cube-room.gltf'}));
scene.standingStats(true);
let boxes = [];
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({exclusive: true}).then(() => {
xrButton.setDevice(device);
});
}).catch(() => {
initFallback();
});
} else {
initFallback();
}
}
function initFallback() {
initGL();
document.body.appendChild(gl.canvas);
let fallbackHelper = new FallbackHelper(scene, gl);
fallbackHelper.emulateStage = true;
}
function initGL(compatibleDevice) {
if (gl)
return;
gl = createWebGLContext({
compatibleXRDevice: compatibleDevice
});
renderer = new Renderer(gl);
scene.setRenderer(renderer);
scene.inputRenderer.setControllerMesh(new Gltf2Node({url: 'media/gltf/controller/controller.gltf'}));
// Create several boxes to use for hit testing.
let boxBuilder = new BoxBuilder();
boxBuilder.pushCube([0, 0, 0], 0.4);
let boxPrimitive = boxBuilder.finishPrimitive(renderer);
function addBox(x, y, z, r, g, b) {
let boxMaterial = new PbrMaterial();
boxMaterial.baseColorFactor.value = [r, g, b, 1.0];
let boxRenderPrimitive = renderer.createRenderPrimitive(boxPrimitive, boxMaterial);
let boxNode = new Node();
boxNode.addRenderPrimitive(boxRenderPrimitive);
// Marks the node as one that needs to be checked when hit testing.
boxNode.selectable = true;
boxes.push({
node: boxNode,
renderPrimitive: boxRenderPrimitive,
position: [x, y, z]
});
scene.addNode(boxNode);
}
addBox(-1.0, 1.6, -1.3, 1.0, 0.0, 0.0);
addBox(0.0, 1.7, -1.5, 0.0, 1.0, 0.0);
addBox(1.0, 1.6, -1.3, 0.0, 0.0, 1.0);
}
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({ exclusive: true }).then((session) => {
xrButton.setSession(session);
onSessionStarted(session);
});
}
function onSessionStarted(session) {
session.addEventListener('end', onSessionEnded);
// By listening for the 'select' event we can find out when the user has
// performed some sort of primary input action and respond to it.
session.addEventListener('select', onSelect);
initGL(session.device);
session.baseLayer = new XRWebGLLayer(session, gl);
session.requestFrameOfReference('stage').then((frameOfRef) => {
if (session.exclusive) {
xrExclusiveFrameOfRef = frameOfRef;
} else {
xrNonExclusiveFrameOfRef = frameOfRef;
}
session.requestAnimationFrame(onXRFrame);
});
}
function onSelect(ev) {
let frameOfRef = ev.frame.session.exclusive ?
xrExclusiveFrameOfRef :
xrNonExclusiveFrameOfRef;
let inputPose = ev.frame.getInputPose(ev.inputSource, frameOfRef);
if (!inputPose) {
return;
}
if (inputPose.pointerMatrix) {
let hitResult = scene.hitTest(inputPose.pointerMatrix)
if (hitResult) {
// Check to see if the hit result was one of our boxes.
for (let box of boxes) {
if (hitResult.node == box.node) {
// Change the box color to something random.
let uniforms = box.renderPrimitive.uniforms;
uniforms.baseColorFactor.value = [Math.random(), Math.random(), Math.random(), 1.0];
}
}
}
}
}
function onEndSession(session) {
session.end();
}
function onSessionEnded(event) {
if (event.session.exclusive) {
document.body.removeChild(document.querySelector('#mirror-canvas'));
xrButton.setSession(null);
}
}
function onXRFrame(t, frame) {
let session = frame.session;
let frameOfRef = session.exclusive ?
xrExclusiveFrameOfRef :
xrNonExclusiveFrameOfRef;
let pose = frame.getDevicePose(frameOfRef);
scene.startFrame();
session.requestAnimationFrame(onXRFrame);
// Update the matrix for each box
let time = Date.now();
for (let box of boxes) {
let node = box.node;
mat4.identity(node.matrix);
mat4.translate(node.matrix, node.matrix, box.position);
mat4.rotateX(node.matrix, node.matrix, time/1000);
mat4.rotateY(node.matrix, node.matrix, time/1500);
}
// In this sample and most samples after it we'll use a helper function
// to automatically add the right meshes for the session's input sources
// each frame. This also does simple hit detection to position the
// cursors correctly on the surface of selectable nodes.
scene.updateInputSources(frame, frameOfRef);
scene.drawXRFrame(frame, pose);
scene.endFrame();
}
// Start the XR application.
initXR();
})();
</script>
</body>
</html>