Help to test if Giro3D correctly deallocates memory.

100% Map style by Stamen Design, © OpenStreetMap contributors
index.js
import StadiaMaps from 'ol/source/StadiaMaps.js';

import { MapControls } from 'three/examples/jsm/controls/MapControls.js';

import Extent from '@giro3d/giro3d/core/geographic/Extent.js';
import Instance from '@giro3d/giro3d/core/Instance.js';
import ColorLayer from '@giro3d/giro3d/core/layer/ColorLayer.js';
import Map from '@giro3d/giro3d/entities/Map.js';
import Inspector from '@giro3d/giro3d/gui/Inspector.js';
import TiledImageSource from '@giro3d/giro3d/sources/TiledImageSource.js';

// Defines geographic extent: CRS, min/max X, min/max Y
const extent = new Extent(
    'EPSG:3857',
    -20037508.342789244,
    20037508.342789244,
    -20037508.342789244,
    20037508.342789244,
);
const dimensions = extent.dimensions();

// `viewerDiv` will contain Giro3D' rendering area (the canvas element)
const viewerDiv = document.getElementById('viewerDiv');

let instance = null;
let inspector = null;
let controls = null;
/** @type {Map} */
let map = null;

function init() {
    // Creates a Giro3D instance
    instance = new Instance(viewerDiv, {
        crs: extent.crs(),
        renderer: {
            clearColor: 0x0a3b59,
        },
    });

    // Creates a map that will contain the layer
    map = new Map('planar', { extent, maxSubdivisionLevel: 10 });

    instance.add(map);

    // Adds an TMS imagery layer
    map.addLayer(
        new ColorLayer({
            name: 'osm',
            source: new TiledImageSource({
                source: new StadiaMaps({ layer: 'stamen_watercolor', wrapX: false }),
            }),
        }),
    ).catch(e => console.error(e));

    // Instanciates camera
    instance.camera.camera3D.position.set(
        (Math.random() - 0.5) * dimensions.x,
        (Math.random() - 0.5) * dimensions.y,
        25000000,
    );

    // Instanciates controls
    controls = new MapControls(instance.camera.camera3D, instance.domElement);

    instance.useTHREEControls(controls);

    inspector = Inspector.attach(document.getElementById('panelDiv'), instance);
}

init();

function reload() {
    if (!instance) return;

    map.getLayers().forEach(l => l.dispose());
    inspector.detach();
    instance.dispose();
    controls.dispose();
    inspector = null;
    instance = null;
    controls = null;
    init();
}

document.getElementById('load_once').addEventListener('click', reload);

// we need to get the current state of the checkbox, as browsers remembers it
let intervalId;
const autoreloadCheckbox = document.getElementById('autoreload');
if (autoreloadCheckbox.checked) {
    intervalId = setInterval(reload, 2000);
}
autoreloadCheckbox.addEventListener('change', e => {
    if (intervalId) {
        clearInterval(intervalId);
    }
    if (e.target.checked) {
        intervalId = setInterval(reload, 2000);
    }
});
index.html
<!doctype html>
<html lang="en">
    <head>
        <title>Dispose instance</title>
        <meta charset="UTF-8" />
        <meta name="name" content="instance_disposing" />
        <meta name="description" content="Help to test if Giro3D correctly deallocates memory." />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />

        <link rel="icon" href="https://giro3d.org/images/favicon.svg" />
        <link href="https://giro3d.org/assets/bootstrap-custom.css" rel="stylesheet" />
        <script src="https://giro3d.org/assets/bootstrap.bundle.min.js"></script>
        <link
            rel="stylesheet"
            type="text/css"
            href="https://giro3d.org/next/css/example.css"
        />

        
    </head>

    <body>
        <div id="viewerDiv" class="m-0 p-0 w-100 h-100"></div>
        <div id="panelDiv" class="position-absolute top-0 start-0 mh-100 overflow-auto"></div>

        <div class="side-pane-with-status-bar">
            <div class="card" id="buttons-container">
                <div class="card-body">
                    <div class="form-check form-switch">
                        <input
                            class="form-check-input"
                            type="checkbox"
                            checked="true"
                            role="switch"
                            id="autoreload"
                            autocomplete="off"
                        />
                        <label class="form-check-label" for="autoreload"
                            >Reload Giro3D every 2 seconds</label
                        >
                    </div>

                    <button id="load_once" class="btn btn-primary">Dispose and reload Giro3D once</button>
                </div>
            </div>
        </div>

        <script type="module" src="index.js"></script>
        <script>
            /* activate popovers */
            const popoverTriggerList = [].slice.call(
                document.querySelectorAll('[data-bs-toggle="popover"]'),
            );
            popoverTriggerList.map(
                // bootstrap is used as script in the template, disable warning about undef
                // eslint-disable-next-line no-undef
                popoverTriggerEl =>
                    new bootstrap.Popover(popoverTriggerEl, {
                        trigger: 'hover',
                        placement: 'left',
                        content: document.getElementById(
                            popoverTriggerEl.getAttribute('data-bs-content'),
                        ).innerHTML,
                        html: true,
                    }),
            );
        </script>
    </body>
</html>
package.json
{
    "name": "instance_disposing",
    "dependencies": {
        "@giro3d/giro3d": "git+https://gitlab.com/giro3d/giro3d.git"
    },
    "devDependencies": {
        "vite": "^3.2.3"
    },
    "scripts": {
        "start": "vite",
        "build": "vite build"
    }
}