playcanvas/build/playcanvas/src/framework/xr/xr-mesh-detection.js

PlayCanvas WebGL game engine

import { platform } from '../../core/platform.js';
import { EventHandler } from '../../core/event-handler.js';
import { XrMesh } from './xr-mesh.js';

class XrMeshDetection extends EventHandler {
		update(frame) {
				if (!this._available) {
						if (!this._manager.session.enabledFeatures && frame.detectedMeshes.size) {
								this._available = true;
								this.fire('available');
						} else {
								return;
						}
				}
				for (var xrMesh of frame.detectedMeshes){
						var mesh = this._index.get(xrMesh);
						if (!mesh) {
								mesh = new XrMesh(this, xrMesh);
								this._index.set(xrMesh, mesh);
								this._list.push(mesh);
								mesh.update(frame);
								this.fire('add', mesh);
						} else {
								mesh.update(frame);
						}
				}
				for (var mesh1 of this._index.values()){
						if (frame.detectedMeshes.has(mesh1.xrMesh)) {
								continue;
						}
						this._removeMesh(mesh1);
				}
		}
		_removeMesh(mesh) {
				this._index.delete(mesh.xrMesh);
				this._list.splice(this._list.indexOf(mesh), 1);
				mesh.destroy();
				this.fire('remove', mesh);
		}
		_onSessionStart() {
				if (this._manager.session.enabledFeatures) {
						var available = this._manager.session.enabledFeatures.indexOf('mesh-detection') !== -1;
						if (!available) return;
						this._available = available;
						this.fire('available');
				}
		}
		_onSessionEnd() {
				if (!this._available) return;
				this._available = false;
				for (var mesh of this._index.values()){
						this._removeMesh(mesh);
				}
				this.fire('unavailable');
		}
		get supported() {
				return this._supported;
		}
		get available() {
				return this._available;
		}
		get meshes() {
				return this._list;
		}
		constructor(manager){
				super(), this._supported = platform.browser && !!window.XRMesh, this._available = false, this._index = new Map(), this._list = [];
				this._manager = manager;
				if (this._supported) {
						this._manager.on('start', this._onSessionStart, this);
						this._manager.on('end', this._onSessionEnd, this);
				}
		}
}
XrMeshDetection.EVENT_AVAILABLE = 'available';
XrMeshDetection.EVENT_UNAVAILABLE = 'unavailable';
XrMeshDetection.EVENT_ADD = 'add';
XrMeshDetection.EVENT_REMOVE = 'remove';

export { XrMeshDetection };