chore(monorepo): import hmwebviewer history at a717900

git-subtree-dir: apps/viewer-3d git-subtree-mainline: 5e10bb1be4 git-subtree-split: a71790070d
2026-07-29 09:04:52 +09:00
parent 5e10bb1be4 a71790070d
commit bedb357259
78 changed files with 15921 additions and 0 deletions
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+import * as THREE from 'three';
+import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';
+import { DRACOLoader } from 'three/examples/jsm/loaders/DRACOLoader.js';
+import { KTX2Loader } from 'three/examples/jsm/loaders/KTX2Loader.js';
+
+export interface ViewerLoaders {
+  gltf: GLTFLoader;
+  draco: DRACOLoader;
+  ktx2: KTX2Loader;
+}
+
+// SINGLETON — multiple DRACOLoader/KTX2Loader instances crash (three.js #22445).
+// Reuse across every load. Decoder WASM lives under public/draco + public/basis
+// (version-matched to the installed three.js).
+let _cache: ViewerLoaders | null = null;
+
+export function getLoaders(renderer: THREE.WebGLRenderer): ViewerLoaders {
+  if (_cache) return _cache;
+  const draco = new DRACOLoader().setDecoderPath('/draco/');
+  const ktx2 = new KTX2Loader().setTranscoderPath('/basis/').detectSupport(renderer);
+  const gltf = new GLTFLoader().setDRACOLoader(draco).setKTX2Loader(ktx2);
+  _cache = { gltf, draco, ktx2 };
+  return _cache;
+}