@needle-tools/engine/lib/asap/sessiongranted.js

Needle Engine is a web-based runtime for 3D apps. It runs on your machine for development with great integrations into editors like Unity or Blender - and can be deployed onto any device! It is flexible, extensible and networking and XR are built-in.

import { needleEngineHasLoaded } from "./utils.js";
/** @returns a new XRSession init object with defaults */
function getDefaultSessionInit(mode) {
    switch (mode) {
        case "immersive-ar":
            return {
                optionalFeatures: ['anchors', 'local-floor', 'hand-tracking', 'layers', 'dom-overlay', 'hit-test'],
            };
        case "immersive-vr":
            return {
                optionalFeatures: ['local-floor', 'bounded-floor', 'hand-tracking', 'high-fixed-foveation-level', 'layers'],
            };
        default:
            console.warn("No default session init for mode", mode);
            return {};
    }
}
let sessionGrantedHandled = false;
export function handleSessionGrantedASAP(opts) {
    if (sessionGrantedHandled)
        return;
    sessionGrantedHandled = true;
    if (!opts.debug)
        return;
    const debugContainer = document.createElement("div");
    debugContainer.style.position = "fixed";
    debugContainer.style.top = "0";
    debugContainer.style.left = "0";
    debugContainer.style.zIndex = "1000";
    debugContainer.style.gap = "10px";
    debugContainer.style.display = "flex";
    if (opts.debug)
        document.body.appendChild(debugContainer);
    if ('xr' in navigator) {
        debugContainer.appendChild(document.createTextNode("needle asap: handleSessionGranted"));
        // WebXRViewer (based on Firefox) has a bug where addEventListener
        // throws a silent exception and aborts execution entirely.
        if (/WebXRViewer\//i.test(navigator.userAgent)) {
            console.warn('WebXRViewer does not support addEventListener');
            return;
        }
        const sessionGranted = async function () {
            navigator.xr?.removeEventListener('sessiongranted', sessionGranted);
            if (needleEngineHasLoaded()) {
                debugContainer.appendChild(document.createTextNode("needle asap: Engine has already loaded"));
                return;
            }
            if (globalThis["needle:XRSession"] != undefined) {
                debugContainer.appendChild(document.createTextNode("needle asap: Session already requested"));
                return;
            }
            console.log('needle asap: Session granted');
            debugContainer.appendChild(document.createTextNode("Session granted"));
            // request immersive VR session and store it in a global variable
            const init = getDefaultSessionInit("immersive-vr");
            const request = navigator.xr?.requestSession('immersive-vr', init);
            globalThis["needle:XRSession"] = request?.catch((err) => {
                console.error('needle asap: Session request failed', err);
                debugContainer.appendChild(document.createTextNode("Session request failed: " + err.message));
                return null;
            });
        };
        navigator.xr?.addEventListener('sessiongranted', sessionGranted, { once: true });
    }
}
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