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// Centralized Asset Manager for LEGO 3D Models:
// Supports high-fidelity Draco-compressed .glb assets with zero-network local loading,
// and seamless fallback to built-in procedural geometry.
import * as THREE from 'three';
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';
import { DRACOLoader } from 'three/examples/jsm/loaders/DRACOLoader.js';
import { createLegoBrickMesh, getLegoMaterial } from '../view/lego-visuals';
import { ClusteredCompoundBody, PlacedPart } from './types';
import { resolveAssetUrl } from '../utils/asset-path';
export type LegoRenderMode = 'draco_glb' | 'procedural';
export interface LegoEngineStats {
mode: LegoRenderMode;
localOffline: boolean;
totalPartsRequested: number;
dracoHits: number;
proceduralFallbacks: number;
}
class LegoAssetManagerImpl {
private renderMode: LegoRenderMode = 'draco_glb';
private localOfflineMode: boolean = true;
private gltfLoader: GLTFLoader;
private dracoLoader: DRACOLoader;
private partTemplateCache = new Map<string, THREE.Group>();
private pendingLoads = new Map<string, Promise<THREE.Group | null>>();
private knownUnavailableParts = new Set<string>();
private stats: LegoEngineStats = {
mode: 'draco_glb',
localOffline: true,
totalPartsRequested: 0,
dracoHits: 0,
proceduralFallbacks: 0,
};
constructor() {
// 1. Read stored mode preferences
try {
const storedMode = localStorage.getItem('fll_lego_render_mode') as LegoRenderMode | null;
if (storedMode === 'draco_glb' || storedMode === 'procedural') {
this.renderMode = storedMode;
}
const storedOffline = localStorage.getItem('fll_local_offline_mode');
if (storedOffline !== null) {
this.localOfflineMode = storedOffline !== 'false';
}
} catch {
// Ignore if localStorage unavailable
}
this.stats.mode = this.renderMode;
this.stats.localOffline = this.localOfflineMode;
// 2. Configure Three.js GLTFLoader with local Draco WASM decoder
this.dracoLoader = new DRACOLoader();
this.dracoLoader.setDecoderPath(resolveAssetUrl('draco/'));
this.dracoLoader.setDecoderConfig({ type: 'wasm' });
this.gltfLoader = new GLTFLoader();
this.gltfLoader.setDRACOLoader(this.dracoLoader);
}
/** Current active mesh rendering mode */
public getRenderMode(): LegoRenderMode {
return this.renderMode;
}
/** Set rendering mode and persist */
public setRenderMode(mode: LegoRenderMode): void {
this.renderMode = mode;
this.stats.mode = mode;
try {
localStorage.setItem('fll_lego_render_mode', mode);
window.dispatchEvent(new CustomEvent('fll_render_mode_changed', { detail: { mode } }));
} catch {
// Ignore
}
}
/** Local offline mode: serves all files directly without external HTTP calls */
public isLocalOfflineMode(): boolean {
return this.localOfflineMode;
}
public setLocalOfflineMode(enabled: boolean): void {
this.localOfflineMode = enabled;
this.stats.localOffline = enabled;
try {
localStorage.setItem('fll_local_offline_mode', enabled ? 'true' : 'false');
} catch {
// Ignore
}
}
/** Clean part ID for asset lookups */
public cleanPartNumber(partNumber: string): string {
return partNumber
.toLowerCase()
.trim()
.replace(/\.(dat|ldr|mpd|io)$/i, '')
.replace(/^bl_/, '')
.replace(/[^a-z0-9]/g, '');
}
/** Get runtime stats for CAD inspector & debugging */
public getStats(): LegoEngineStats {
return { ...this.stats };
}
/** Reset stats counter */
public resetStats(): void {
this.stats.totalPartsRequested = 0;
this.stats.dracoHits = 0;
this.stats.proceduralFallbacks = 0;
}
/**
* Asynchronously load a LEGO piece using Draco GLB if available,
* with seamless fallback to procedural geometry.
*/
public async loadPartMesh(
partNumber: string,
colorHex: number,
role?: string
): Promise<THREE.Object3D> {
this.stats.totalPartsRequested++;
// Procedural mode requested by user
if (this.renderMode === 'procedural') {
this.stats.proceduralFallbacks++;
return createLegoBrickMesh(partNumber, colorHex, role);
}
const cleanId = this.cleanPartNumber(partNumber);
// If known not available in local GLB library, fast fallback
if (this.knownUnavailableParts.has(cleanId)) {
this.stats.proceduralFallbacks++;
return createLegoBrickMesh(partNumber, colorHex, role);
}
try {
const template = await this.getTemplate(cleanId);
if (template) {
this.stats.dracoHits++;
return this.instantiateTemplate(template, colorHex);
}
} catch {
// Ignore error and fall through to procedural
}
this.knownUnavailableParts.add(cleanId);
this.stats.proceduralFallbacks++;
return createLegoBrickMesh(partNumber, colorHex, role);
}
/**
* Synchronous load for instant rendering; returns cached Draco mesh if available,
* otherwise procedural mesh.
*/
public loadPartMeshSync(
partNumber: string,
colorHex: number,
role?: string
): THREE.Object3D {
this.stats.totalPartsRequested++;
if (this.renderMode === 'draco_glb') {
const cleanId = this.cleanPartNumber(partNumber);
const cached = this.partTemplateCache.get(cleanId);
if (cached) {
this.stats.dracoHits++;
return this.instantiateTemplate(cached, colorHex);
}
}
this.stats.proceduralFallbacks++;
return createLegoBrickMesh(partNumber, colorHex, role);
}
/**
* Builds all 3D meshes for a cluster concurrently.
*/
public async buildClusterMeshes(
cluster: ClusteredCompoundBody,
defaultColor: number
): Promise<THREE.Object3D[]> {
if (!cluster.parts || cluster.parts.length === 0) {
return [];
}
const promises = cluster.parts.map(async (part: PlacedPart) => {
const pColor = part.colorHex ?? defaultColor;
const mesh = await this.loadPartMesh(part.partNumber, pColor, part.role);
mesh.position.set(part.position[0] / 1000, part.position[1] / 1000, part.position[2] / 1000);
mesh.quaternion.set(part.rotation[0], part.rotation[1], part.rotation[2], part.rotation[3]);
return mesh;
});
return Promise.all(promises);
}
/** Fetch or retrieve cached template */
private async getTemplate(cleanId: string): Promise<THREE.Group | null> {
if (this.partTemplateCache.has(cleanId)) {
return this.partTemplateCache.get(cleanId)!;
}
if (this.pendingLoads.has(cleanId)) {
return this.pendingLoads.get(cleanId)!;
}
const loadPromise = (async () => {
try {
const url = resolveAssetUrl(`parts/draco/${cleanId}.glb`);
const gltf = await this.gltfLoader.loadAsync(url);
const group = gltf.scene as THREE.Group;
this.partTemplateCache.set(cleanId, group);
return group;
} catch {
this.knownUnavailableParts.add(cleanId);
return null;
} finally {
this.pendingLoads.delete(cleanId);
}
})();
this.pendingLoads.set(cleanId, loadPromise);
return loadPromise;
}
/** Clone template and apply assigned LEGO color material */
private instantiateTemplate(template: THREE.Group, colorHex: number): THREE.Group {
const clone = template.clone(true);
const mat = getLegoMaterial(colorHex);
clone.traverse((child) => {
if ((child as THREE.Mesh).isMesh) {
const mesh = child as THREE.Mesh;
mesh.material = mat;
mesh.castShadow = true;
mesh.receiveShadow = true;
}
});
return clone;
}
}
export const legoAssetManager = new LegoAssetManagerImpl();
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