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| <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' /> | ||
| <link rel='icon' type='image/png' sizes='32x32' href='favicon-32x32.png' /> | ||
| <link rel='icon' type='image/png' sizes='96x96' href='favicon-96x96.png' /> | ||
| <link rel='stylesheet' href='https://raw.githubusercontent.com/immersive-web/webxr-samples/main/css/common.css' /> | ||
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| # Immersive VR Session | ||
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| <header> | ||
| <details open> | ||
| <summary>Immersive VR Session</summary> | ||
| <p> | ||
| This sample demonstrates how to use an 'immersive-vr' XRSession to | ||
| present a simple WebGL scene to an XR device. The scene is not | ||
| rendered to the page. | ||
| <a class="back" href="./">Back</a> | ||
| </p> | ||
| </details> | ||
| </header> | ||
| <main style='text-align: center;'> | ||
| <p>Click 'Enter XR' to see content</p> | ||
| </main> | ||
| <script type="module"> | ||
| import {} from './webxr.js'; | ||
| initXR(this); | ||
| </script> |
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| import {WebXRButton} from 'https://raw.githubusercontent.com/immersive-web/webxr-samples/main/js/util/webxr-button.js'; | ||
| import {Scene} from 'https://raw.githubusercontent.com/immersive-web/webxr-samples/main/js/render/scenes/scene.js'; | ||
| import {Renderer, createWebGLContext} from 'https://raw.githubusercontent.com/immersive-web/webxr-samples/main/js/render/core/renderer.js'; | ||
| import {Gltf2Node} from 'https://raw.githubusercontent.com/immersive-web/webxr-samples/main/js/render/nodes/gltf2.js'; | ||
| import {SkyboxNode} from 'https://raw.githubusercontent.com/immersive-web/webxr-samples/main/js/render/nodes/skybox.js'; | ||
| import {QueryArgs} from 'https://raw.githubusercontent.com/immersive-web/webxr-samples/main/js/util/query-args.js'; | ||
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| // If requested, use the polyfill to provide support for mobile devices | ||
| // and devices which only support WebVR. | ||
| import WebXRPolyfill from 'https://raw.githubusercontent.com/immersive-web/webxr-samples/main/js/third-party/webxr-polyfill/build/webxr-polyfill.module.js'; | ||
| if (QueryArgs.getBool('usePolyfill', true)) { | ||
| let polyfill = new WebXRPolyfill(); | ||
| } | ||
|
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| // XR globals. | ||
| let xrButton = null; | ||
| let xrRefSpace = null; | ||
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| // WebGL scene globals. | ||
| let gl = null; | ||
| let renderer = null; | ||
| let scene = new Scene(); | ||
| scene.addNode(new Gltf2Node({url: 'https://raw.githubusercontent.com/immersive-web/webxr-samples/main/media/gltf/space/space.gltf'})); | ||
| scene.addNode(new SkyboxNode({url: 'https://raw.githubusercontent.com/immersive-web/webxr-samples/main/media/textures/milky-way-4k.png'})); | ||
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| // Checks to see if WebXR is available and, if so, queries a list of | ||
| // XRDevices that are connected to the system. | ||
| export default function initXR(context) { | ||
| // Adds a helper button to the page that indicates if any XRDevices are | ||
| // available and let's the user pick between them if there's multiple. | ||
| xrButton = new WebXRButton({ | ||
| onRequestSession: onRequestSession, | ||
| onEndSession: onEndSession | ||
| }); | ||
| lively.query(context, 'header').appendChild(xrButton.domElement); | ||
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| // Is WebXR available on this UA? | ||
| if (navigator.xr) { | ||
| // If the device allows creation of exclusive sessions set it as the | ||
| // target of the 'Enter XR' button. | ||
| navigator.xr.isSessionSupported('immersive-vr').then((supported) => { | ||
| xrButton.enabled = supported; | ||
| }); | ||
| } | ||
| } | ||
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| // Called when the user selects a device to present to. In response we | ||
| // will request an exclusive session from that device. | ||
| function onRequestSession() { | ||
| return navigator.xr.requestSession('immersive-vr').then(onSessionStarted); | ||
| } | ||
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| // Called when we've successfully acquired a XRSession. In response we | ||
| // will set up the necessary session state and kick off the frame loop. | ||
| function onSessionStarted(session) { | ||
| // This informs the 'Enter XR' button that the session has started and | ||
| // that it should display 'Exit XR' instead. | ||
| xrButton.setSession(session); | ||
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| // Listen for the sessions 'end' event so we can respond if the user | ||
| // or UA ends the session for any reason. | ||
| session.addEventListener('end', onSessionEnded); | ||
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| // Create a WebGL context to render with, initialized to be compatible | ||
| // with the XRDisplay we're presenting to. | ||
| gl = createWebGLContext({ | ||
| xrCompatible: true | ||
| }); | ||
|
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| // Create a renderer with that GL context (this is just for the samples | ||
| // framework and has nothing to do with WebXR specifically.) | ||
| renderer = new Renderer(gl); | ||
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| // Set the scene's renderer, which creates the necessary GPU resources. | ||
| scene.setRenderer(renderer); | ||
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| // Use the new WebGL context to create a XRWebGLLayer and set it as the | ||
| // sessions baseLayer. This allows any content rendered to the layer to | ||
| // be displayed on the XRDevice. | ||
| session.updateRenderState({ baseLayer: new XRWebGLLayer(session, gl) }); | ||
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| // Get a frame of reference, which is required for querying poses. In | ||
| // this case an 'local' frame of reference means that all poses will | ||
| // be relative to the location where the XRDevice was first detected. | ||
| session.requestReferenceSpace('local').then((refSpace) => { | ||
| xrRefSpace = refSpace; | ||
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| // Inform the session that we're ready to begin drawing. | ||
| session.requestAnimationFrame(onXRFrame); | ||
| }); | ||
| } | ||
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| // Called when the user clicks the 'Exit XR' button. In response we end | ||
| // the session. | ||
| function onEndSession(session) { | ||
| session.end(); | ||
| } | ||
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| // Called either when the user has explicitly ended the session (like in | ||
| // onEndSession()) or when the UA has ended the session for any reason. | ||
| // At this point the session object is no longer usable and should be | ||
| // discarded. | ||
| function onSessionEnded(event) { | ||
| xrButton.setSession(null); | ||
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| // In this simple case discard the WebGL context too, since we're not | ||
| // rendering anything else to the screen with it. | ||
| renderer = null; | ||
| } | ||
|
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| // Called every time the XRSession requests that a new frame be drawn. | ||
| function onXRFrame(t, frame) { | ||
| let session = frame.session; | ||
|
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| // Per-frame scene setup. Nothing WebXR specific here. | ||
| scene.startFrame(); | ||
|
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| // Inform the session that we're ready for the next frame. | ||
| session.requestAnimationFrame(onXRFrame); | ||
|
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| // Get the XRDevice pose relative to the Frame of Reference we created | ||
| // earlier. | ||
| let pose = frame.getViewerPose(xrRefSpace); | ||
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| // Getting the pose may fail if, for example, tracking is lost. So we | ||
| // have to check to make sure that we got a valid pose before attempting | ||
| // to render with it. If not in this case we'll just leave the | ||
| // framebuffer cleared, so tracking loss means the scene will simply | ||
| // disappear. | ||
| if (pose) { | ||
| let glLayer = session.renderState.baseLayer; | ||
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| // If we do have a valid pose, bind the WebGL layer's framebuffer, | ||
| // which is where any content to be displayed on the XRDevice must be | ||
| // rendered. | ||
| gl.bindFramebuffer(gl.FRAMEBUFFER, glLayer.framebuffer); | ||
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| // Clear the framebuffer | ||
| gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); | ||
|
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| // 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 = glLayer.getViewport(view); | ||
| gl.viewport(viewport.x, viewport.y, | ||
| viewport.width, viewport.height); | ||
|
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| // 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 matrix and view transform from the current view. | ||
| // We bound the framebuffer and viewport up above, and are passing | ||
| // in the appropriate matrices here to be used when rendering. | ||
| scene.draw(view.projectionMatrix, view.transform); | ||
| } | ||
| } 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 reprojection. 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 teardown. Nothing WebXR specific here. | ||
| scene.endFrame(); | ||
| } |
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