234 lines
4.7 KiB
JavaScript
234 lines
4.7 KiB
JavaScript
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class VRButton {
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static createButton( renderer, sessionInit = {} ) {
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const button = document.createElement( 'button' );
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function showEnterVR( /*device*/ ) {
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let currentSession = null;
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async function onSessionStarted( session ) {
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session.addEventListener( 'end', onSessionEnded );
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await renderer.xr.setSession( session );
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button.textContent = 'EXIT VR';
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currentSession = session;
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}
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function onSessionEnded( /*event*/ ) {
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currentSession.removeEventListener( 'end', onSessionEnded );
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button.textContent = 'ENTER VR';
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currentSession = null;
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}
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//
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button.style.display = '';
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button.style.cursor = 'pointer';
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button.style.left = 'calc(50% - 50px)';
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button.style.width = '100px';
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button.textContent = 'ENTER VR';
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// WebXR's requestReferenceSpace only works if the corresponding feature
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// was requested at session creation time. For simplicity, just ask for
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// the interesting ones as optional features, but be aware that the
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// requestReferenceSpace call will fail if it turns out to be unavailable.
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// ('local' is always available for immersive sessions and doesn't need to
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// be requested separately.)
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const sessionOptions = {
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...sessionInit,
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optionalFeatures: [
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'local-floor',
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'bounded-floor',
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'layers',
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...( sessionInit.optionalFeatures || [] )
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],
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};
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button.onmouseenter = function () {
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button.style.opacity = '1.0';
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};
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button.onmouseleave = function () {
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button.style.opacity = '0.5';
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};
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button.onclick = function () {
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if ( currentSession === null ) {
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navigator.xr.requestSession( 'immersive-vr', sessionOptions ).then( onSessionStarted );
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} else {
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currentSession.end();
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if ( navigator.xr.offerSession !== undefined ) {
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navigator.xr.offerSession( 'immersive-vr', sessionOptions )
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.then( onSessionStarted )
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.catch( ( err ) => {
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console.warn( err );
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} );
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}
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}
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};
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if ( navigator.xr.offerSession !== undefined ) {
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navigator.xr.offerSession( 'immersive-vr', sessionOptions )
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.then( onSessionStarted )
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.catch( ( err ) => {
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console.warn( err );
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} );
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}
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}
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function disableButton() {
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button.style.display = '';
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button.style.cursor = 'auto';
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button.style.left = 'calc(50% - 75px)';
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button.style.width = '150px';
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button.onmouseenter = null;
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button.onmouseleave = null;
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button.onclick = null;
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}
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function showWebXRNotFound() {
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disableButton();
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button.textContent = 'VR NOT SUPPORTED';
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}
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function showVRNotAllowed( exception ) {
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disableButton();
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console.warn( 'Exception when trying to call xr.isSessionSupported', exception );
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button.textContent = 'VR NOT ALLOWED';
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}
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function stylizeElement( element ) {
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element.style.position = 'absolute';
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element.style.bottom = '20px';
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element.style.padding = '12px 6px';
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element.style.border = '1px solid #fff';
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element.style.borderRadius = '4px';
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element.style.background = 'rgba(0,0,0,0.1)';
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element.style.color = '#fff';
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element.style.font = 'normal 13px sans-serif';
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element.style.textAlign = 'center';
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element.style.opacity = '0.5';
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element.style.outline = 'none';
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element.style.zIndex = '999';
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}
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if ( 'xr' in navigator ) {
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button.id = 'VRButton';
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button.style.display = 'none';
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stylizeElement( button );
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navigator.xr.isSessionSupported( 'immersive-vr' ).then( function ( supported ) {
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supported ? showEnterVR() : showWebXRNotFound();
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if ( supported && VRButton.xrSessionIsGranted ) {
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button.click();
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}
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} ).catch( showVRNotAllowed );
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return button;
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} else {
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const message = document.createElement( 'a' );
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if ( window.isSecureContext === false ) {
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message.href = document.location.href.replace( /^http:/, 'https:' );
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message.innerHTML = 'WEBXR NEEDS HTTPS'; // TODO Improve message
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} else {
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message.href = 'https://immersiveweb.dev/';
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message.innerHTML = 'WEBXR NOT AVAILABLE';
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}
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message.style.left = 'calc(50% - 90px)';
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message.style.width = '180px';
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message.style.textDecoration = 'none';
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stylizeElement( message );
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return message;
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}
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}
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static registerSessionGrantedListener() {
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if ( typeof navigator !== 'undefined' && 'xr' in navigator ) {
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// WebXRViewer (based on Firefox) has a bug where addEventListener
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// throws a silent exception and aborts execution entirely.
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if ( /WebXRViewer\//i.test( navigator.userAgent ) ) return;
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navigator.xr.addEventListener( 'sessiongranted', () => {
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VRButton.xrSessionIsGranted = true;
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} );
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}
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}
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}
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VRButton.xrSessionIsGranted = false;
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VRButton.registerSessionGrantedListener();
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export { VRButton };
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