viewer.js

// viewer.js
// ==============================

export let app = null;
let cameraEntity = null;
let modelEntity = null;
let viewerInitialized = false;
let resizeObserver = null;

let chosenCameraX, chosenCameraY, chosenCameraZ;
let minZoom, maxZoom, minAngle, maxAngle, minAzimuth, maxAzimuth, minPivotY, minY;
let modelX, modelY, modelZ, modelScale, modelRotationX, modelRotationY, modelRotationZ;
let sogsUrl, glbUrl, canvasBg;

function getDeviceTypes() {
    const ua = navigator.userAgent;
    if (/iPad|iPhone|iPod/.test(ua) || (ua.includes("Macintosh") && "ontouchend" in document)) {
        return ['webgl2', 'webgl1']; // Try both on iOS
    }
    return ['webgl2', 'webgl1'];
}

export async function initializeViewer(config, instanceId) {
    try {
        alert("initializeViewer: start");
        if (viewerInitialized) return;

        const isIOS = /iPad|iPhone|iPod/.test(navigator.userAgent);
        const isMobile = isIOS || /Android/i.test(navigator.userAgent);

        // Parse config fields
        sogsUrl   = config.sogs_json_url;
        glbUrl    = config.glb_url;
        canvasBg  = config.canvas_background || "#ffffff";
        minZoom   = parseFloat(config.minZoom || "1");
        maxZoom   = parseFloat(config.maxZoom || "20");
        minAngle  = parseFloat(config.minAngle || "-45");
        maxAngle  = parseFloat(config.maxAngle || "90");
        minAzimuth= (config.minAzimuth !== undefined) ? parseFloat(config.minAzimuth) : -360;
        maxAzimuth= (config.maxAzimuth !== undefined) ? parseFloat(config.maxAzimuth) : 360;
        minPivotY = parseFloat(config.minPivotY || "0");
        minY      = (config.minY !== undefined) ? parseFloat(config.minY) : 0;

        modelX          = (config.modelX !== undefined) ? parseFloat(config.modelX) : 0;
        modelY          = (config.modelY !== undefined) ? parseFloat(config.modelY) : 0;
        modelZ          = (config.modelZ !== undefined) ? parseFloat(config.modelZ) : 0;
        modelScale      = (config.modelScale !== undefined) ? parseFloat(config.modelScale) : 1;
        modelRotationX  = (config.modelRotationX !== undefined) ? parseFloat(config.modelRotationX) : 0;
        modelRotationY  = (config.modelRotationY !== undefined) ? parseFloat(config.modelRotationY) : 0;
        modelRotationZ  = (config.modelRotationZ !== undefined) ? parseFloat(config.modelRotationZ) : 0;

        const cameraX      = (config.cameraX !== undefined) ? parseFloat(config.cameraX) : 0;
        const cameraY      = (config.cameraY !== undefined) ? parseFloat(config.cameraY) : 2;
        const cameraZ      = (config.cameraZ !== undefined) ? parseFloat(config.cameraZ) : 5;
        const cameraXPhone = (config.cameraXPhone !== undefined) ? parseFloat(config.cameraXPhone) : cameraX;
        const cameraYPhone = (config.cameraYPhone !== undefined) ? parseFloat(config.cameraYPhone) : cameraY;
        const cameraZPhone = (config.cameraZPhone !== undefined) ? parseFloat(config.cameraZPhone) : (cameraZ * 1.5);

        chosenCameraX = isMobile ? cameraXPhone : cameraX;
        chosenCameraY = isMobile ? cameraYPhone : cameraY;
        chosenCameraZ = isMobile ? cameraZPhone : cameraZ;

        const canvasId         = 'canvas-' + instanceId;
        const progressDialog   = document.getElementById('progress-dialog-' + instanceId);
        const viewerContainer  = document.getElementById('viewer-container-' + instanceId);

        let oldCanvas = document.getElementById(canvasId);
        if (oldCanvas) oldCanvas.remove();

        const canvas = document.createElement('canvas');
        canvas.id = canvasId;
        canvas.className = 'ply-canvas';
        canvas.style.width = "100%";
        canvas.style.height = "100%";
        canvas.setAttribute('tabindex', '0');
        viewerContainer.insertBefore(canvas, progressDialog);

        canvas.style.background = canvasBg;
        canvas.style.touchAction = "none";
        canvas.style.webkitTouchCallout = "none";
        canvas.addEventListener('gesturestart', e => e.preventDefault());
        canvas.addEventListener('gesturechange', e => e.preventDefault());
        canvas.addEventListener('gestureend', e => e.preventDefault());
        canvas.addEventListener('dblclick', e => e.preventDefault());
        canvas.addEventListener('touchstart', e => { if (e.touches.length > 1) e.preventDefault(); }, { passive: false });
        canvas.addEventListener('wheel', (e) => { e.preventDefault(); }, { passive: false });

        progressDialog.style.display = 'block';
        alert("Canvas created. Loading PlayCanvas...");

        // 1. Import PlayCanvas
        const pcMod = await import("https://cdn.jsdelivr.net/npm/playcanvas@2.8.0/+esm");
        alert("PlayCanvas imported.");
        window.pc = pcMod; // ensures global for script-based scripts
        // 2. Now all use window.pc from here
        const pc = window.pc;

        // 3. Graphics Device
        const gfxOptions = {
            deviceTypes: getDeviceTypes(),
            glslangUrl: "https://mikafil-viewer-sgos.static.hf.space/static/lib/glslang/glslang.js",
            twgslUrl:   "https://mikafil-viewer-sgos.static.hf.space/static/lib/twgsl/twgsl.js",
            antialias: false
        };
        const device = await pc.createGraphicsDevice(canvas, gfxOptions);
        device.maxPixelRatio = Math.min(window.devicePixelRatio, 2);
        alert("Graphics device created.");

        // 4. App creation (Application, not AppBase for max compatibility)
        app = new pc.Application(canvas, {
            graphicsDevice: device,
            mouse: new pc.Mouse(canvas),
            touch: new pc.TouchDevice(canvas),
            componentSystems: [
                pc.RenderComponentSystem,
                pc.CameraComponentSystem,
                pc.LightComponentSystem,
                pc.ScriptComponentSystem,
                pc.GSplatComponentSystem,
                pc.CollisionComponentSystem,
                pc.RigidbodyComponentSystem
            ],
            resourceHandlers: [
                pc.TextureHandler,
                pc.ContainerHandler,
                pc.ScriptHandler,
                pc.GSplatHandler
            ]
        });
        alert("App created.");

        app.setCanvasFillMode(pc.FILLMODE_NONE);
        app.setCanvasResolution(pc.RESOLUTION_AUTO);

        // Resize observer logic
        resizeObserver = new ResizeObserver(entries => {
            entries.forEach(entry => {
                app.resizeCanvas(entry.contentRect.width, entry.contentRect.height);
            });
        });
        resizeObserver.observe(viewerContainer);
        window.addEventListener('resize', () => app.resizeCanvas(viewerContainer.clientWidth, viewerContainer.clientHeight));
        app.on('destroy', () => resizeObserver.disconnect());

        // Asset loading
        const assets = {
            sogs: new pc.Asset('gsplat', 'gsplat', { url: sogsUrl }),
            orbit: new pc.Asset('script', 'script', { url: "https://mikafil-viewer-sgos.static.hf.space/orbit-camera.js" }),
            glb: new pc.Asset('glb', 'container', { url: glbUrl }),
        };
        for (const key in assets) app.assets.add(assets[key]);

        const assetList = Object.values(assets).filter(asset => asset.url);
        const assetListLoader = new pc.AssetListLoader(assetList, app.assets);

        assetListLoader.load(() => {
            alert("Asset loader started.");
            if (!assets.sogs.resource) {
                alert("SOGS asset failed to load.");
                return;
            }
            modelEntity = new pc.Entity('model');
            modelEntity.addComponent('gsplat', { asset: assets.sogs });
            modelEntity.setLocalPosition(modelX, modelY, modelZ);
            modelEntity.setLocalEulerAngles(modelRotationX, modelRotationY, modelRotationZ);
            modelEntity.setLocalScale(modelScale, modelScale, modelScale);
            app.root.addChild(modelEntity);

            if (!assets.orbit.resource) {
                alert("orbit-camera.js asset failed to load!");
                return;
            }
            alert("orbit-camera.js asset ready.");

            if (assets.glb && assets.glb.resource && assets.glb.resource.instantiateRenderEntity) {
                const glbEntity = assets.glb.resource.instantiateRenderEntity();
                app.root.addChild(glbEntity);
                alert("GLB asset ready.");
            } else {
                alert("GLB not provided or failed to load.");
            }

            cameraEntity = new pc.Entity('camera');
            // Parse and apply background color
            let bg = [1, 1, 1, 1];
            if (canvasBg && /^#?[0-9a-f]{6,8}$/i.test(canvasBg.replace("#", ""))) {
                let hex = canvasBg.replace("#", "");
                if (hex.length === 6) hex += "FF";
                const num = parseInt(hex, 16);
                bg = [
                    ((num >> 24) & 0xFF) / 255,
                    ((num >> 16) & 0xFF) / 255,
                    ((num >> 8)  & 0xFF) / 255,
                    (num & 0xFF) / 255
                ];
            }
            cameraEntity.addComponent('camera', { clearColor: new pc.Color(bg[0], bg[1], bg[2], bg[3]) });
            cameraEntity.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
            cameraEntity.lookAt(modelEntity.getPosition());
            cameraEntity.addComponent('script');

            cameraEntity.script.create('orbitCamera', {
                attributes: {
                    focusEntity: modelEntity,
                    inertiaFactor: 0.2,
                    distanceMax: maxZoom,
                    distanceMin: minZoom,
                    pitchAngleMax: maxAngle,
                    pitchAngleMin: minAngle,
                    yawAngleMax: maxAzimuth,
                    yawAngleMin: minAzimuth,
                    minY: minY,
                    frameOnStart: false
                }
            });
            cameraEntity.script.create('orbitCameraInputMouse');
            cameraEntity.script.create('orbitCameraInputTouch');
            app.root.addChild(cameraEntity);

            app.setCanvasFillMode(pc.FILLMODE_NONE);
            app.setCanvasResolution(pc.RESOLUTION_AUTO);
            app.resizeCanvas(viewerContainer.clientWidth, viewerContainer.clientHeight);

            app.once('update', () => resetViewerCamera());

            // Tooltips support (optional)
            try {
                if (config.tooltips_url) {
                    import('https://mikafil-viewer-sgos.static.hf.space/tooltips.js').then(tooltipsModule => {
                        tooltipsModule.initializeTooltips({
                            app,
                            cameraEntity,
                            modelEntity,
                            tooltipsUrl: config.tooltips_url,
                            defaultVisible: !!config.showTooltipsDefault,
                            moveDuration: config.tooltipMoveDuration || 0.6
                        });
                    }).catch(e => {
                        alert("Tooltips import failed: " + e);
                    });
                }
            } catch (e) {
                alert("Tooltips error: " + e);
            }

            progressDialog.style.display = 'none';
            alert("App finished initializing. (Last alert)");
            viewerInitialized = true;
        });

    } catch (e) {
        alert("viewer.js error: " + e);
    }
}

export function resetViewerCamera() {
    try {
        if (!cameraEntity || !modelEntity || !app) return;
        const orbitCam = cameraEntity.script.orbitCamera;
        if (!orbitCam) return;

        const modelPos = modelEntity.getPosition();
        const tempEnt = new window.pc.Entity();
        tempEnt.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
        tempEnt.lookAt(modelPos);

        const dist = new window.pc.Vec3().sub2(
            new window.pc.Vec3(chosenCameraX, chosenCameraY, chosenCameraZ),
            modelPos
        ).length();

        cameraEntity.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
        cameraEntity.lookAt(modelPos);

        orbitCam.pivotPoint = modelPos.clone();
        orbitCam._targetDistance = dist;
        orbitCam._distance       = dist;

        const rot = tempEnt.getRotation();
        const fwd = new window.pc.Vec3();
        rot.transformVector(window.pc.Vec3.FORWARD, fwd);

        const yaw = Math.atan2(-fwd.x, -fwd.z) * window.pc.math.RAD_TO_DEG;
        const yawQuat = new window.pc.Quat().setFromEulerAngles(0, -yaw, 0);
        const rotNoYaw = new window.pc.Quat().mul2(yawQuat, rot);
        const fNoYaw = new window.pc.Vec3();
        rotNoYaw.transformVector(window.pc.Vec3.FORWARD, fNoYaw);
        const pitch = Math.atan2(fNoYaw.y, -fNoYaw.z) * window.pc.math.RAD_TO_DEG;

        orbitCam._targetYaw   = yaw;
        orbitCam._yaw         = yaw;
        orbitCam._targetPitch = pitch;
        orbitCam._pitch       = pitch;
        if (orbitCam._updatePosition) orbitCam._updatePosition();

        tempEnt.destroy();
    } catch (e) {
        alert("resetViewerCamera error: " + e);
    }
}