import { Loader, LoaderUtils, FileLoader, Color, SpotLight, PointLight, DirectionalLight, MeshBasicMaterial, SRGBColorSpace, MeshPhysicalMaterial, Vector2, Matrix4, Vector3, InstancedMesh, Object3D, TextureLoader, ImageBitmapLoader, BufferAttribute, InterleavedBuffer, LinearFilter, LinearMipmapLinearFilter, RepeatWrapping, PointsMaterial, Material, LineBasicMaterial, MeshStandardMaterial, DoubleSide, PropertyBinding, BufferGeometry, SkinnedMesh, Mesh, LineSegments, Line, LineLoop, Points, Group, PerspectiveCamera, MathUtils, OrthographicCamera, Skeleton, AnimationClip, Bone, InterpolateLinear, Quaternion, NearestFilter, NearestMipmapNearestFilter, LinearMipmapNearestFilter, NearestMipmapLinearFilter, ClampToEdgeWrapping, MirroredRepeatWrapping, InterpolateDiscrete, FrontSide, InterleavedBufferAttribute, Texture, TriangleStripDrawMode, TriangleFanDrawMode, VectorKeyframeTrack, NumberKeyframeTrack, QuaternionKeyframeTrack, Box3, Sphere, Interpolant } from "../../../build/three.module.js";
import { toTrianglesDrawMode } from "../utils/BufferGeometryUtils.js";
class GLTFLoader extends Loader {
  constructor(manager) {
    super(manager);
    this.dracoLoader = null;
    this.ktx2Loader = null;
    this.meshoptDecoder = null;
    this.pluginCallbacks = [];
    this.register(function(parser) {
      return new GLTFMaterialsClearcoatExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFTextureBasisUExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFTextureWebPExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFTextureAVIFExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFMaterialsSheenExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFMaterialsTransmissionExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFMaterialsVolumeExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFMaterialsIorExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFMaterialsEmissiveStrengthExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFMaterialsSpecularExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFMaterialsIridescenceExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFMaterialsAnisotropyExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFLightsExtension(parser);
    });
    this.register(function(parser) {
      return new GLTFMeshoptCompression(parser);
    });
    this.register(function(parser) {
      return new GLTFMeshGpuInstancing(parser);
    });
  }
  load(url, onLoad, onProgress, onError) {
    const scope = this;
    let resourcePath;
    if (this.resourcePath !== "") {
      resourcePath = this.resourcePath;
    } else if (this.path !== "") {
      resourcePath = this.path;
    } else {
      resourcePath = LoaderUtils.extractUrlBase(url);
    }
    this.manager.itemStart(url);
    const _onError = function(e) {
      if (onError) {
        onError(e);
      } else {
        console.error(e);
      }
      scope.manager.itemError(url);
      scope.manager.itemEnd(url);
    };
    const loader = new FileLoader(this.manager);
    loader.setPath(this.path);
    loader.setResponseType("arraybuffer");
    loader.setRequestHeader(this.requestHeader);
    loader.setWithCredentials(this.withCredentials);
    loader.load(url, function(data) {
      try {
        scope.parse(data, resourcePath, function(gltf) {
          onLoad(gltf);
          scope.manager.itemEnd(url);
        }, _onError);
      } catch (e) {
        _onError(e);
      }
    }, onProgress, _onError);
  }
  setDRACOLoader(dracoLoader) {
    this.dracoLoader = dracoLoader;
    return this;
  }
  setDDSLoader() {
    throw new Error(
      'THREE.GLTFLoader: "MSFT_texture_dds" no longer supported. Please update to "KHR_texture_basisu".'
    );
  }
  setKTX2Loader(ktx2Loader) {
    this.ktx2Loader = ktx2Loader;
    return this;
  }
  setMeshoptDecoder(meshoptDecoder) {
    this.meshoptDecoder = meshoptDecoder;
    return this;
  }
  register(callback) {
    if (this.pluginCallbacks.indexOf(callback) === -1) {
      this.pluginCallbacks.push(callback);
    }
    return this;
  }
  unregister(callback) {
    if (this.pluginCallbacks.indexOf(callback) !== -1) {
      this.pluginCallbacks.splice(this.pluginCallbacks.indexOf(callback), 1);
    }
    return this;
  }
  parse(data, path, onLoad, onError) {
    let json;
    const extensions = {};
    const plugins = {};
    const textDecoder = new TextDecoder();
    if (typeof data === "string") {
      json = JSON.parse(data);
    } else if (data instanceof ArrayBuffer) {
      const magic = textDecoder.decode(new Uint8Array(data, 0, 4));
      if (magic === BINARY_EXTENSION_HEADER_MAGIC) {
        try {
          extensions[EXTENSIONS.KHR_BINARY_GLTF] = new GLTFBinaryExtension(data);
        } catch (error) {
          if (onError)
            onError(error);
          return;
        }
        json = JSON.parse(extensions[EXTENSIONS.KHR_BINARY_GLTF].content);
      } else {
        json = JSON.parse(textDecoder.decode(data));
      }
    } else {
      json = data;
    }
    if (json.asset === void 0 || json.asset.version[0] < 2) {
      if (onError)
        onError(new Error("THREE.GLTFLoader: Unsupported asset. glTF versions >=2.0 are supported."));
      return;
    }
    const parser = new GLTFParser(json, {
      path: path || this.resourcePath || "",
      crossOrigin: this.crossOrigin,
      requestHeader: this.requestHeader,
      manager: this.manager,
      ktx2Loader: this.ktx2Loader,
      meshoptDecoder: this.meshoptDecoder
    });
    parser.fileLoader.setRequestHeader(this.requestHeader);
    for (let i = 0; i < this.pluginCallbacks.length; i++) {
      const plugin = this.pluginCallbacks[i](parser);
      plugins[plugin.name] = plugin;
      extensions[plugin.name] = true;
    }
    if (json.extensionsUsed) {
      for (let i = 0; i < json.extensionsUsed.length; ++i) {
        const extensionName = json.extensionsUsed[i];
        const extensionsRequired = json.extensionsRequired || [];
        switch (extensionName) {
          case EXTENSIONS.KHR_MATERIALS_UNLIT:
            extensions[extensionName] = new GLTFMaterialsUnlitExtension();
            break;
          case EXTENSIONS.KHR_DRACO_MESH_COMPRESSION:
            extensions[extensionName] = new GLTFDracoMeshCompressionExtension(json, this.dracoLoader);
            break;
          case EXTENSIONS.KHR_TEXTURE_TRANSFORM:
            extensions[extensionName] = new GLTFTextureTransformExtension();
            break;
          case EXTENSIONS.KHR_MESH_QUANTIZATION:
            extensions[extensionName] = new GLTFMeshQuantizationExtension();
            break;
          default:
            if (extensionsRequired.indexOf(extensionName) >= 0 && plugins[extensionName] === void 0) {
              console.warn('THREE.GLTFLoader: Unknown extension "' + extensionName + '".');
            }
        }
      }
    }
    parser.setExtensions(extensions);
    parser.setPlugins(plugins);
    parser.parse(onLoad, onError);
  }
  parseAsync(data, path) {
    const scope = this;
    return new Promise(function(resolve, reject) {
      scope.parse(data, path, resolve, reject);
    });
  }
}
function GLTFRegistry() {
  let objects = {};
  return {
    get: function(key) {
      return objects[key];
    },
    add: function(key, object) {
      objects[key] = object;
    },
    remove: function(key) {
      delete objects[key];
    },
    removeAll: function() {
      objects = {};
    }
  };
}
const EXTENSIONS = {
  KHR_BINARY_GLTF: "KHR_binary_glTF",
  KHR_DRACO_MESH_COMPRESSION: "KHR_draco_mesh_compression",
  KHR_LIGHTS_PUNCTUAL: "KHR_lights_punctual",
  KHR_MATERIALS_CLEARCOAT: "KHR_materials_clearcoat",
  KHR_MATERIALS_IOR: "KHR_materials_ior",
  KHR_MATERIALS_SHEEN: "KHR_materials_sheen",
  KHR_MATERIALS_SPECULAR: "KHR_materials_specular",
  KHR_MATERIALS_TRANSMISSION: "KHR_materials_transmission",
  KHR_MATERIALS_IRIDESCENCE: "KHR_materials_iridescence",
  KHR_MATERIALS_ANISOTROPY: "KHR_materials_anisotropy",
  KHR_MATERIALS_UNLIT: "KHR_materials_unlit",
  KHR_MATERIALS_VOLUME: "KHR_materials_volume",
  KHR_TEXTURE_BASISU: "KHR_texture_basisu",
  KHR_TEXTURE_TRANSFORM: "KHR_texture_transform",
  KHR_MESH_QUANTIZATION: "KHR_mesh_quantization",
  KHR_MATERIALS_EMISSIVE_STRENGTH: "KHR_materials_emissive_strength",
  EXT_TEXTURE_WEBP: "EXT_texture_webp",
  EXT_TEXTURE_AVIF: "EXT_texture_avif",
  EXT_MESHOPT_COMPRESSION: "EXT_meshopt_compression",
  EXT_MESH_GPU_INSTANCING: "EXT_mesh_gpu_instancing"
};
class GLTFLightsExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.KHR_LIGHTS_PUNCTUAL;
    this.cache = { refs: {}, uses: {} };
  }
  _markDefs() {
    const parser = this.parser;
    const nodeDefs = this.parser.json.nodes || [];
    for (let nodeIndex = 0, nodeLength = nodeDefs.length; nodeIndex < nodeLength; nodeIndex++) {
      const nodeDef = nodeDefs[nodeIndex];
      if (nodeDef.extensions && nodeDef.extensions[this.name] && nodeDef.extensions[this.name].light !== void 0) {
        parser._addNodeRef(this.cache, nodeDef.extensions[this.name].light);
      }
    }
  }
  _loadLight(lightIndex) {
    const parser = this.parser;
    const cacheKey = "light:" + lightIndex;
    let dependency = parser.cache.get(cacheKey);
    if (dependency)
      return dependency;
    const json = parser.json;
    const extensions = json.extensions && json.extensions[this.name] || {};
    const lightDefs = extensions.lights || [];
    const lightDef = lightDefs[lightIndex];
    let lightNode;
    const color = new Color(16777215);
    if (lightDef.color !== void 0)
      color.fromArray(lightDef.color);
    const range = lightDef.range !== void 0 ? lightDef.range : 0;
    switch (lightDef.type) {
      case "directional":
        lightNode = new DirectionalLight(color);
        lightNode.target.position.set(0, 0, -1);
        lightNode.add(lightNode.target);
        break;
      case "point":
        lightNode = new PointLight(color);
        lightNode.distance = range;
        break;
      case "spot":
        lightNode = new SpotLight(color);
        lightNode.distance = range;
        lightDef.spot = lightDef.spot || {};
        lightDef.spot.innerConeAngle = lightDef.spot.innerConeAngle !== void 0 ? lightDef.spot.innerConeAngle : 0;
        lightDef.spot.outerConeAngle = lightDef.spot.outerConeAngle !== void 0 ? lightDef.spot.outerConeAngle : Math.PI / 4;
        lightNode.angle = lightDef.spot.outerConeAngle;
        lightNode.penumbra = 1 - lightDef.spot.innerConeAngle / lightDef.spot.outerConeAngle;
        lightNode.target.position.set(0, 0, -1);
        lightNode.add(lightNode.target);
        break;
      default:
        throw new Error("THREE.GLTFLoader: Unexpected light type: " + lightDef.type);
    }
    lightNode.position.set(0, 0, 0);
    lightNode.decay = 2;
    assignExtrasToUserData(lightNode, lightDef);
    if (lightDef.intensity !== void 0)
      lightNode.intensity = lightDef.intensity;
    lightNode.name = parser.createUniqueName(lightDef.name || "light_" + lightIndex);
    dependency = Promise.resolve(lightNode);
    parser.cache.add(cacheKey, dependency);
    return dependency;
  }
  getDependency(type, index) {
    if (type !== "light")
      return;
    return this._loadLight(index);
  }
  createNodeAttachment(nodeIndex) {
    const self2 = this;
    const parser = this.parser;
    const json = parser.json;
    const nodeDef = json.nodes[nodeIndex];
    const lightDef = nodeDef.extensions && nodeDef.extensions[this.name] || {};
    const lightIndex = lightDef.light;
    if (lightIndex === void 0)
      return null;
    return this._loadLight(lightIndex).then(function(light) {
      return parser._getNodeRef(self2.cache, lightIndex, light);
    });
  }
}
class GLTFMaterialsUnlitExtension {
  constructor() {
    this.name = EXTENSIONS.KHR_MATERIALS_UNLIT;
  }
  getMaterialType() {
    return MeshBasicMaterial;
  }
  extendParams(materialParams, materialDef, parser) {
    const pending = [];
    materialParams.color = new Color(1, 1, 1);
    materialParams.opacity = 1;
    const metallicRoughness = materialDef.pbrMetallicRoughness;
    if (metallicRoughness) {
      if (Array.isArray(metallicRoughness.baseColorFactor)) {
        const array = metallicRoughness.baseColorFactor;
        materialParams.color.fromArray(array);
        materialParams.opacity = array[3];
      }
      if (metallicRoughness.baseColorTexture !== void 0) {
        pending.push(parser.assignTexture(materialParams, "map", metallicRoughness.baseColorTexture, SRGBColorSpace));
      }
    }
    return Promise.all(pending);
  }
}
class GLTFMaterialsEmissiveStrengthExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.KHR_MATERIALS_EMISSIVE_STRENGTH;
  }
  extendMaterialParams(materialIndex, materialParams) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name]) {
      return Promise.resolve();
    }
    const emissiveStrength = materialDef.extensions[this.name].emissiveStrength;
    if (emissiveStrength !== void 0) {
      materialParams.emissiveIntensity = emissiveStrength;
    }
    return Promise.resolve();
  }
}
class GLTFMaterialsClearcoatExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.KHR_MATERIALS_CLEARCOAT;
  }
  getMaterialType(materialIndex) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name])
      return null;
    return MeshPhysicalMaterial;
  }
  extendMaterialParams(materialIndex, materialParams) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name]) {
      return Promise.resolve();
    }
    const pending = [];
    const extension = materialDef.extensions[this.name];
    if (extension.clearcoatFactor !== void 0) {
      materialParams.clearcoat = extension.clearcoatFactor;
    }
    if (extension.clearcoatTexture !== void 0) {
      pending.push(parser.assignTexture(materialParams, "clearcoatMap", extension.clearcoatTexture));
    }
    if (extension.clearcoatRoughnessFactor !== void 0) {
      materialParams.clearcoatRoughness = extension.clearcoatRoughnessFactor;
    }
    if (extension.clearcoatRoughnessTexture !== void 0) {
      pending.push(parser.assignTexture(materialParams, "clearcoatRoughnessMap", extension.clearcoatRoughnessTexture));
    }
    if (extension.clearcoatNormalTexture !== void 0) {
      pending.push(parser.assignTexture(materialParams, "clearcoatNormalMap", extension.clearcoatNormalTexture));
      if (extension.clearcoatNormalTexture.scale !== void 0) {
        const scale = extension.clearcoatNormalTexture.scale;
        materialParams.clearcoatNormalScale = new Vector2(scale, scale);
      }
    }
    return Promise.all(pending);
  }
}
class GLTFMaterialsIridescenceExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.KHR_MATERIALS_IRIDESCENCE;
  }
  getMaterialType(materialIndex) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name])
      return null;
    return MeshPhysicalMaterial;
  }
  extendMaterialParams(materialIndex, materialParams) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name]) {
      return Promise.resolve();
    }
    const pending = [];
    const extension = materialDef.extensions[this.name];
    if (extension.iridescenceFactor !== void 0) {
      materialParams.iridescence = extension.iridescenceFactor;
    }
    if (extension.iridescenceTexture !== void 0) {
      pending.push(parser.assignTexture(materialParams, "iridescenceMap", extension.iridescenceTexture));
    }
    if (extension.iridescenceIor !== void 0) {
      materialParams.iridescenceIOR = extension.iridescenceIor;
    }
    if (materialParams.iridescenceThicknessRange === void 0) {
      materialParams.iridescenceThicknessRange = [100, 400];
    }
    if (extension.iridescenceThicknessMinimum !== void 0) {
      materialParams.iridescenceThicknessRange[0] = extension.iridescenceThicknessMinimum;
    }
    if (extension.iridescenceThicknessMaximum !== void 0) {
      materialParams.iridescenceThicknessRange[1] = extension.iridescenceThicknessMaximum;
    }
    if (extension.iridescenceThicknessTexture !== void 0) {
      pending.push(parser.assignTexture(materialParams, "iridescenceThicknessMap", extension.iridescenceThicknessTexture));
    }
    return Promise.all(pending);
  }
}
class GLTFMaterialsSheenExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.KHR_MATERIALS_SHEEN;
  }
  getMaterialType(materialIndex) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name])
      return null;
    return MeshPhysicalMaterial;
  }
  extendMaterialParams(materialIndex, materialParams) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name]) {
      return Promise.resolve();
    }
    const pending = [];
    materialParams.sheenColor = new Color(0, 0, 0);
    materialParams.sheenRoughness = 0;
    materialParams.sheen = 1;
    const extension = materialDef.extensions[this.name];
    if (extension.sheenColorFactor !== void 0) {
      materialParams.sheenColor.fromArray(extension.sheenColorFactor);
    }
    if (extension.sheenRoughnessFactor !== void 0) {
      materialParams.sheenRoughness = extension.sheenRoughnessFactor;
    }
    if (extension.sheenColorTexture !== void 0) {
      pending.push(parser.assignTexture(materialParams, "sheenColorMap", extension.sheenColorTexture, SRGBColorSpace));
    }
    if (extension.sheenRoughnessTexture !== void 0) {
      pending.push(parser.assignTexture(materialParams, "sheenRoughnessMap", extension.sheenRoughnessTexture));
    }
    return Promise.all(pending);
  }
}
class GLTFMaterialsTransmissionExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.KHR_MATERIALS_TRANSMISSION;
  }
  getMaterialType(materialIndex) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name])
      return null;
    return MeshPhysicalMaterial;
  }
  extendMaterialParams(materialIndex, materialParams) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name]) {
      return Promise.resolve();
    }
    const pending = [];
    const extension = materialDef.extensions[this.name];
    if (extension.transmissionFactor !== void 0) {
      materialParams.transmission = extension.transmissionFactor;
    }
    if (extension.transmissionTexture !== void 0) {
      pending.push(parser.assignTexture(materialParams, "transmissionMap", extension.transmissionTexture));
    }
    return Promise.all(pending);
  }
}
class GLTFMaterialsVolumeExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.KHR_MATERIALS_VOLUME;
  }
  getMaterialType(materialIndex) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name])
      return null;
    return MeshPhysicalMaterial;
  }
  extendMaterialParams(materialIndex, materialParams) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name]) {
      return Promise.resolve();
    }
    const pending = [];
    const extension = materialDef.extensions[this.name];
    materialParams.thickness = extension.thicknessFactor !== void 0 ? extension.thicknessFactor : 0;
    if (extension.thicknessTexture !== void 0) {
      pending.push(parser.assignTexture(materialParams, "thicknessMap", extension.thicknessTexture));
    }
    materialParams.attenuationDistance = extension.attenuationDistance || Infinity;
    const colorArray = extension.attenuationColor || [1, 1, 1];
    materialParams.attenuationColor = new Color(colorArray[0], colorArray[1], colorArray[2]);
    return Promise.all(pending);
  }
}
class GLTFMaterialsIorExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.KHR_MATERIALS_IOR;
  }
  getMaterialType(materialIndex) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name])
      return null;
    return MeshPhysicalMaterial;
  }
  extendMaterialParams(materialIndex, materialParams) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name]) {
      return Promise.resolve();
    }
    const extension = materialDef.extensions[this.name];
    materialParams.ior = extension.ior !== void 0 ? extension.ior : 1.5;
    return Promise.resolve();
  }
}
class GLTFMaterialsSpecularExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.KHR_MATERIALS_SPECULAR;
  }
  getMaterialType(materialIndex) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name])
      return null;
    return MeshPhysicalMaterial;
  }
  extendMaterialParams(materialIndex, materialParams) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name]) {
      return Promise.resolve();
    }
    const pending = [];
    const extension = materialDef.extensions[this.name];
    materialParams.specularIntensity = extension.specularFactor !== void 0 ? extension.specularFactor : 1;
    if (extension.specularTexture !== void 0) {
      pending.push(parser.assignTexture(materialParams, "specularIntensityMap", extension.specularTexture));
    }
    const colorArray = extension.specularColorFactor || [1, 1, 1];
    materialParams.specularColor = new Color(colorArray[0], colorArray[1], colorArray[2]);
    if (extension.specularColorTexture !== void 0) {
      pending.push(parser.assignTexture(materialParams, "specularColorMap", extension.specularColorTexture, SRGBColorSpace));
    }
    return Promise.all(pending);
  }
}
class GLTFMaterialsAnisotropyExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.KHR_MATERIALS_ANISOTROPY;
  }
  getMaterialType(materialIndex) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name])
      return null;
    return MeshPhysicalMaterial;
  }
  extendMaterialParams(materialIndex, materialParams) {
    const parser = this.parser;
    const materialDef = parser.json.materials[materialIndex];
    if (!materialDef.extensions || !materialDef.extensions[this.name]) {
      return Promise.resolve();
    }
    const pending = [];
    const extension = materialDef.extensions[this.name];
    if (extension.anisotropyStrength !== void 0) {
      materialParams.anisotropy = extension.anisotropyStrength;
    }
    if (extension.anisotropyRotation !== void 0) {
      materialParams.anisotropyRotation = extension.anisotropyRotation;
    }
    if (extension.anisotropyTexture !== void 0) {
      pending.push(parser.assignTexture(materialParams, "anisotropyMap", extension.anisotropyTexture));
    }
    return Promise.all(pending);
  }
}
class GLTFTextureBasisUExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.KHR_TEXTURE_BASISU;
  }
  loadTexture(textureIndex) {
    const parser = this.parser;
    const json = parser.json;
    const textureDef = json.textures[textureIndex];
    if (!textureDef.extensions || !textureDef.extensions[this.name]) {
      return null;
    }
    const extension = textureDef.extensions[this.name];
    const loader = parser.options.ktx2Loader;
    if (!loader) {
      if (json.extensionsRequired && json.extensionsRequired.indexOf(this.name) >= 0) {
        throw new Error("THREE.GLTFLoader: setKTX2Loader must be called before loading KTX2 textures");
      } else {
        return null;
      }
    }
    return parser.loadTextureImage(textureIndex, extension.source, loader);
  }
}
class GLTFTextureWebPExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.EXT_TEXTURE_WEBP;
    this.isSupported = null;
  }
  loadTexture(textureIndex) {
    const name = this.name;
    const parser = this.parser;
    const json = parser.json;
    const textureDef = json.textures[textureIndex];
    if (!textureDef.extensions || !textureDef.extensions[name]) {
      return null;
    }
    const extension = textureDef.extensions[name];
    const source = json.images[extension.source];
    let loader = parser.textureLoader;
    if (source.uri) {
      const handler = parser.options.manager.getHandler(source.uri);
      if (handler !== null)
        loader = handler;
    }
    return this.detectSupport().then(function(isSupported) {
      if (isSupported)
        return parser.loadTextureImage(textureIndex, extension.source, loader);
      if (json.extensionsRequired && json.extensionsRequired.indexOf(name) >= 0) {
        throw new Error("THREE.GLTFLoader: WebP required by asset but unsupported.");
      }
      return parser.loadTexture(textureIndex);
    });
  }
  detectSupport() {
    if (!this.isSupported) {
      this.isSupported = new Promise(function(resolve) {
        const image = new Image();
        image.src = "data:image/webp;base64,UklGRiIAAABXRUJQVlA4IBYAAAAwAQCdASoBAAEADsD+JaQAA3AAAAAA";
        image.onload = image.onerror = function() {
          resolve(image.height === 1);
        };
      });
    }
    return this.isSupported;
  }
}
class GLTFTextureAVIFExtension {
  constructor(parser) {
    this.parser = parser;
    this.name = EXTENSIONS.EXT_TEXTURE_AVIF;
    this.isSupported = null;
  }
  loadTexture(textureIndex) {
    const name = this.name;
    const parser = this.parser;
    const json = parser.json;
    const textureDef = json.textures[textureIndex];
    if (!textureDef.extensions || !textureDef.extensions[name]) {
      return null;
    }
    const extension = textureDef.extensions[name];
    const source = json.images[extension.source];
    let loader = parser.textureLoader;
    if (source.uri) {
      const handler = parser.options.manager.getHandler(source.uri);
      if (handler !== null)
        loader = handler;
    }
    return this.detectSupport().then(function(isSupported) {
      if (isSupported)
        return parser.loadTextureImage(textureIndex, extension.source, loader);
      if (json.extensionsRequired && json.extensionsRequired.indexOf(name) >= 0) {
        throw new Error("THREE.GLTFLoader: AVIF required by asset but unsupported.");
      }
      return parser.loadTexture(textureIndex);
    });
  }
  detectSupport() {
    if (!this.isSupported) {
      this.isSupported = new Promise(function(resolve) {
        const image = new Image();
        image.src = "data:image/avif;base64,AAAAIGZ0eXBhdmlmAAAAAGF2aWZtaWYxbWlhZk1BMUIAAADybWV0YQAAAAAAAAAoaGRscgAAAAAAAAAAcGljdAAAAAAAAAAAAAAAAGxpYmF2aWYAAAAADnBpdG0AAAAAAAEAAAAeaWxvYwAAAABEAAABAAEAAAABAAABGgAAABcAAAAoaWluZgAAAAAAAQAAABppbmZlAgAAAAABAABhdjAxQ29sb3IAAAAAamlwcnAAAABLaXBjbwAAABRpc3BlAAAAAAAAAAEAAAABAAAAEHBpeGkAAAAAAwgICAAAAAxhdjFDgQAMAAAAABNjb2xybmNseAACAAIABoAAAAAXaXBtYQAAAAAAAAABAAEEAQKDBAAAAB9tZGF0EgAKCBgABogQEDQgMgkQAAAAB8dSLfI=";
        image.onload = image.onerror = function() {
          resolve(image.height === 1);
        };
      });
    }
    return this.isSupported;
  }
}
class GLTFMeshoptCompression {
  constructor(parser) {
    this.name = EXTENSIONS.EXT_MESHOPT_COMPRESSION;
    this.parser = parser;
  }
  loadBufferView(index) {
    const json = this.parser.json;
    const bufferView = json.bufferViews[index];
    if (bufferView.extensions && bufferView.extensions[this.name]) {
      const extensionDef = bufferView.extensions[this.name];
      const buffer = this.parser.getDependency("buffer", extensionDef.buffer);
      const decoder = this.parser.options.meshoptDecoder;
      if (!decoder || !decoder.supported) {
        if (json.extensionsRequired && json.extensionsRequired.indexOf(this.name) >= 0) {
          throw new Error("THREE.GLTFLoader: setMeshoptDecoder must be called before loading compressed files");
        } else {
          return null;
        }
      }
      return buffer.then(function(res) {
        const byteOffset = extensionDef.byteOffset || 0;
        const byteLength = extensionDef.byteLength || 0;
        const count = extensionDef.count;
        const stride = extensionDef.byteStride;
        const source = new Uint8Array(res, byteOffset, byteLength);
        if (decoder.decodeGltfBufferAsync) {
          return decoder.decodeGltfBufferAsync(count, stride, source, extensionDef.mode, extensionDef.filter).then(function(res2) {
            return res2.buffer;
          });
        } else {
          return decoder.ready.then(function() {
            const result = new ArrayBuffer(count * stride);
            decoder.decodeGltfBuffer(new Uint8Array(result), count, stride, source, extensionDef.mode, extensionDef.filter);
            return result;
          });
        }
      });
    } else {
      return null;
    }
  }
}
class GLTFMeshGpuInstancing {
  constructor(parser) {
    this.name = EXTENSIONS.EXT_MESH_GPU_INSTANCING;
    this.parser = parser;
  }
  createNodeMesh(nodeIndex) {
    const json = this.parser.json;
    const nodeDef = json.nodes[nodeIndex];
    if (!nodeDef.extensions || !nodeDef.extensions[this.name] || nodeDef.mesh === void 0) {
      return null;
    }
    const meshDef = json.meshes[nodeDef.mesh];
    for (const primitive of meshDef.primitives) {
      if (primitive.mode !== WEBGL_CONSTANTS.TRIANGLES && primitive.mode !== WEBGL_CONSTANTS.TRIANGLE_STRIP && primitive.mode !== WEBGL_CONSTANTS.TRIANGLE_FAN && primitive.mode !== void 0) {
        return null;
      }
    }
    const extensionDef = nodeDef.extensions[this.name];
    const attributesDef = extensionDef.attributes;
    const pending = [];
    const attributes = {};
    for (const key in attributesDef) {
      pending.push(this.parser.getDependency("accessor", attributesDef[key]).then((accessor) => {
        attributes[key] = accessor;
        return attributes[key];
      }));
    }
    if (pending.length < 1) {
      return null;
    }
    pending.push(this.parser.createNodeMesh(nodeIndex));
    return Promise.all(pending).then((results) => {
      const nodeObject = results.pop();
      const meshes = nodeObject.isGroup ? nodeObject.children : [nodeObject];
      const count = results[0].count;
      const instancedMeshes = [];
      for (const mesh of meshes) {
        const m = new Matrix4();
        const p = new Vector3();
        const q = new Quaternion();
        const s = new Vector3(1, 1, 1);
        const instancedMesh = new InstancedMesh(mesh.geometry, mesh.material, count);
        for (let i = 0; i < count; i++) {
          if (attributes.TRANSLATION) {
            p.fromBufferAttribute(attributes.TRANSLATION, i);
          }
          if (attributes.ROTATION) {
            q.fromBufferAttribute(attributes.ROTATION, i);
          }
          if (attributes.SCALE) {
            s.fromBufferAttribute(attributes.SCALE, i);
          }
          instancedMesh.setMatrixAt(i, m.compose(p, q, s));
        }
        for (const attributeName in attributes) {
          if (attributeName !== "TRANSLATION" && attributeName !== "ROTATION" && attributeName !== "SCALE") {
            mesh.geometry.setAttribute(attributeName, attributes[attributeName]);
          }
        }
        Object3D.prototype.copy.call(instancedMesh, mesh);
        this.parser.assignFinalMaterial(instancedMesh);
        instancedMeshes.push(instancedMesh);
      }
      if (nodeObject.isGroup) {
        nodeObject.clear();
        nodeObject.add(...instancedMeshes);
        return nodeObject;
      }
      return instancedMeshes[0];
    });
  }
}
const BINARY_EXTENSION_HEADER_MAGIC = "glTF";
const BINARY_EXTENSION_HEADER_LENGTH = 12;
const BINARY_EXTENSION_CHUNK_TYPES = { JSON: 1313821514, BIN: 5130562 };
class GLTFBinaryExtension {
  constructor(data) {
    this.name = EXTENSIONS.KHR_BINARY_GLTF;
    this.content = null;
    this.body = null;
    const headerView = new DataView(data, 0, BINARY_EXTENSION_HEADER_LENGTH);
    const textDecoder = new TextDecoder();
    this.header = {
      magic: textDecoder.decode(new Uint8Array(data.slice(0, 4))),
      version: headerView.getUint32(4, true),
      length: headerView.getUint32(8, true)
    };
    if (this.header.magic !== BINARY_EXTENSION_HEADER_MAGIC) {
      throw new Error("THREE.GLTFLoader: Unsupported glTF-Binary header.");
    } else if (this.header.version < 2) {
      throw new Error("THREE.GLTFLoader: Legacy binary file detected.");
    }
    const chunkContentsLength = this.header.length - BINARY_EXTENSION_HEADER_LENGTH;
    const chunkView = new DataView(data, BINARY_EXTENSION_HEADER_LENGTH);
    let chunkIndex = 0;
    while (chunkIndex < chunkContentsLength) {
      const chunkLength = chunkView.getUint32(chunkIndex, true);
      chunkIndex += 4;
      const chunkType = chunkView.getUint32(chunkIndex, true);
      chunkIndex += 4;
      if (chunkType === BINARY_EXTENSION_CHUNK_TYPES.JSON) {
        const contentArray = new Uint8Array(data, BINARY_EXTENSION_HEADER_LENGTH + chunkIndex, chunkLength);
        this.content = textDecoder.decode(contentArray);
      } else if (chunkType === BINARY_EXTENSION_CHUNK_TYPES.BIN) {
        const byteOffset = BINARY_EXTENSION_HEADER_LENGTH + chunkIndex;
        this.body = data.slice(byteOffset, byteOffset + chunkLength);
      }
      chunkIndex += chunkLength;
    }
    if (this.content === null) {
      throw new Error("THREE.GLTFLoader: JSON content not found.");
    }
  }
}
class GLTFDracoMeshCompressionExtension {
  constructor(json, dracoLoader) {
    if (!dracoLoader) {
      throw new Error("THREE.GLTFLoader: No DRACOLoader instance provided.");
    }
    this.name = EXTENSIONS.KHR_DRACO_MESH_COMPRESSION;
    this.json = json;
    this.dracoLoader = dracoLoader;
    this.dracoLoader.preload();
  }
  decodePrimitive(primitive, parser) {
    const json = this.json;
    const dracoLoader = this.dracoLoader;
    const bufferViewIndex = primitive.extensions[this.name].bufferView;
    const gltfAttributeMap = primitive.extensions[this.name].attributes;
    const threeAttributeMap = {};
    const attributeNormalizedMap = {};
    const attributeTypeMap = {};
    for (const attributeName in gltfAttributeMap) {
      const threeAttributeName = ATTRIBUTES[attributeName] || attributeName.toLowerCase();
      threeAttributeMap[threeAttributeName] = gltfAttributeMap[attributeName];
    }
    for (const attributeName in primitive.attributes) {
      const threeAttributeName = ATTRIBUTES[attributeName] || attributeName.toLowerCase();
      if (gltfAttributeMap[attributeName] !== void 0) {
        const accessorDef = json.accessors[primitive.attributes[attributeName]];
        const componentType = WEBGL_COMPONENT_TYPES[accessorDef.componentType];
        attributeTypeMap[threeAttributeName] = componentType.name;
        attributeNormalizedMap[threeAttributeName] = accessorDef.normalized === true;
      }
    }
    return parser.getDependency("bufferView", bufferViewIndex).then(function(bufferView) {
      return new Promise(function(resolve) {
        dracoLoader.decodeDracoFile(bufferView, function(geometry) {
          for (const attributeName in geometry.attributes) {
            const attribute = geometry.attributes[attributeName];
            const normalized = attributeNormalizedMap[attributeName];
            if (normalized !== void 0)
              attribute.normalized = normalized;
          }
          resolve(geometry);
        }, threeAttributeMap, attributeTypeMap);
      });
    });
  }
}
class GLTFTextureTransformExtension {
  constructor() {
    this.name = EXTENSIONS.KHR_TEXTURE_TRANSFORM;
  }
  extendTexture(texture, transform) {
    if ((transform.texCoord === void 0 || transform.texCoord === texture.channel) && transform.offset === void 0 && transform.rotation === void 0 && transform.scale === void 0) {
      return texture;
    }
    texture = texture.clone();
    if (transform.texCoord !== void 0) {
      texture.channel = transform.texCoord;
    }
    if (transform.offset !== void 0) {
      texture.offset.fromArray(transform.offset);
    }
    if (transform.rotation !== void 0) {
      texture.rotation = transform.rotation;
    }
    if (transform.scale !== void 0) {
      texture.repeat.fromArray(transform.scale);
    }
    texture.needsUpdate = true;
    return texture;
  }
}
class GLTFMeshQuantizationExtension {
  constructor() {
    this.name = EXTENSIONS.KHR_MESH_QUANTIZATION;
  }
}
class GLTFCubicSplineInterpolant extends Interpolant {
  constructor(parameterPositions, sampleValues, sampleSize, resultBuffer) {
    super(parameterPositions, sampleValues, sampleSize, resultBuffer);
  }
  copySampleValue_(index) {
    const result = this.resultBuffer, values = this.sampleValues, valueSize = this.valueSize, offset = index * valueSize * 3 + valueSize;
    for (let i = 0; i !== valueSize; i++) {
      result[i] = values[offset + i];
    }
    return result;
  }
  interpolate_(i1, t0, t, t1) {
    const result = this.resultBuffer;
    const values = this.sampleValues;
    const stride = this.valueSize;
    const stride2 = stride * 2;
    const stride3 = stride * 3;
    const td = t1 - t0;
    const p = (t - t0) / td;
    const pp = p * p;
    const ppp = pp * p;
    const offset1 = i1 * stride3;
    const offset0 = offset1 - stride3;
    const s2 = -2 * ppp + 3 * pp;
    const s3 = ppp - pp;
    const s0 = 1 - s2;
    const s1 = s3 - pp + p;
    for (let i = 0; i !== stride; i++) {
      const p0 = values[offset0 + i + stride];
      const m0 = values[offset0 + i + stride2] * td;
      const p1 = values[offset1 + i + stride];
      const m1 = values[offset1 + i] * td;
      result[i] = s0 * p0 + s1 * m0 + s2 * p1 + s3 * m1;
    }
    return result;
  }
}
const _q = new Quaternion();
class GLTFCubicSplineQuaternionInterpolant extends GLTFCubicSplineInterpolant {
  interpolate_(i1, t0, t, t1) {
    const result = super.interpolate_(i1, t0, t, t1);
    _q.fromArray(result).normalize().toArray(result);
    return result;
  }
}
const WEBGL_CONSTANTS = {
  FLOAT: 5126,
  //FLOAT_MAT2: 35674,
  FLOAT_MAT3: 35675,
  FLOAT_MAT4: 35676,
  FLOAT_VEC2: 35664,
  FLOAT_VEC3: 35665,
  FLOAT_VEC4: 35666,
  LINEAR: 9729,
  REPEAT: 10497,
  SAMPLER_2D: 35678,
  POINTS: 0,
  LINES: 1,
  LINE_LOOP: 2,
  LINE_STRIP: 3,
  TRIANGLES: 4,
  TRIANGLE_STRIP: 5,
  TRIANGLE_FAN: 6,
  UNSIGNED_BYTE: 5121,
  UNSIGNED_SHORT: 5123
};
const WEBGL_COMPONENT_TYPES = {
  5120: Int8Array,
  5121: Uint8Array,
  5122: Int16Array,
  5123: Uint16Array,
  5125: Uint32Array,
  5126: Float32Array
};
const WEBGL_FILTERS = {
  9728: NearestFilter,
  9729: LinearFilter,
  9984: NearestMipmapNearestFilter,
  9985: LinearMipmapNearestFilter,
  9986: NearestMipmapLinearFilter,
  9987: LinearMipmapLinearFilter
};
const WEBGL_WRAPPINGS = {
  33071: ClampToEdgeWrapping,
  33648: MirroredRepeatWrapping,
  10497: RepeatWrapping
};
const WEBGL_TYPE_SIZES = {
  "SCALAR": 1,
  "VEC2": 2,
  "VEC3": 3,
  "VEC4": 4,
  "MAT2": 4,
  "MAT3": 9,
  "MAT4": 16
};
const ATTRIBUTES = {
  POSITION: "position",
  NORMAL: "normal",
  TANGENT: "tangent",
  TEXCOORD_0: "uv",
  TEXCOORD_1: "uv1",
  TEXCOORD_2: "uv2",
  TEXCOORD_3: "uv3",
  COLOR_0: "color",
  WEIGHTS_0: "skinWeight",
  JOINTS_0: "skinIndex"
};
const PATH_PROPERTIES = {
  scale: "scale",
  translation: "position",
  rotation: "quaternion",
  weights: "morphTargetInfluences"
};
const INTERPOLATION = {
  CUBICSPLINE: void 0,
  // We use a custom interpolant (GLTFCubicSplineInterpolation) for CUBICSPLINE tracks. Each
  // keyframe track will be initialized with a default interpolation type, then modified.
  LINEAR: InterpolateLinear,
  STEP: InterpolateDiscrete
};
const ALPHA_MODES = {
  OPAQUE: "OPAQUE",
  MASK: "MASK",
  BLEND: "BLEND"
};
function createDefaultMaterial(cache) {
  if (cache["DefaultMaterial"] === void 0) {
    cache["DefaultMaterial"] = new MeshStandardMaterial({
      color: 16777215,
      emissive: 0,
      metalness: 1,
      roughness: 1,
      transparent: false,
      depthTest: true,
      side: FrontSide
    });
  }
  return cache["DefaultMaterial"];
}
function addUnknownExtensionsToUserData(knownExtensions, object, objectDef) {
  for (const name in objectDef.extensions) {
    if (knownExtensions[name] === void 0) {
      object.userData.gltfExtensions = object.userData.gltfExtensions || {};
      object.userData.gltfExtensions[name] = objectDef.extensions[name];
    }
  }
}
function assignExtrasToUserData(object, gltfDef) {
  if (gltfDef.extras !== void 0) {
    if (typeof gltfDef.extras === "object") {
      Object.assign(object.userData, gltfDef.extras);
    } else {
      console.warn("THREE.GLTFLoader: Ignoring primitive type .extras, " + gltfDef.extras);
    }
  }
}
function addMorphTargets(geometry, targets, parser) {
  let hasMorphPosition = false;
  let hasMorphNormal = false;
  let hasMorphColor = false;
  for (let i = 0, il = targets.length; i < il; i++) {
    const target = targets[i];
    if (target.POSITION !== void 0)
      hasMorphPosition = true;
    if (target.NORMAL !== void 0)
      hasMorphNormal = true;
    if (target.COLOR_0 !== void 0)
      hasMorphColor = true;
    if (hasMorphPosition && hasMorphNormal && hasMorphColor)
      break;
  }
  if (!hasMorphPosition && !hasMorphNormal && !hasMorphColor)
    return Promise.resolve(geometry);
  const pendingPositionAccessors = [];
  const pendingNormalAccessors = [];
  const pendingColorAccessors = [];
  for (let i = 0, il = targets.length; i < il; i++) {
    const target = targets[i];
    if (hasMorphPosition) {
      const pendingAccessor = target.POSITION !== void 0 ? parser.getDependency("accessor", target.POSITION) : geometry.attributes.position;
      pendingPositionAccessors.push(pendingAccessor);
    }
    if (hasMorphNormal) {
      const pendingAccessor = target.NORMAL !== void 0 ? parser.getDependency("accessor", target.NORMAL) : geometry.attributes.normal;
      pendingNormalAccessors.push(pendingAccessor);
    }
    if (hasMorphColor) {
      const pendingAccessor = target.COLOR_0 !== void 0 ? parser.getDependency("accessor", target.COLOR_0) : geometry.attributes.color;
      pendingColorAccessors.push(pendingAccessor);
    }
  }
  return Promise.all([
    Promise.all(pendingPositionAccessors),
    Promise.all(pendingNormalAccessors),
    Promise.all(pendingColorAccessors)
  ]).then(function(accessors) {
    const morphPositions = accessors[0];
    const morphNormals = accessors[1];
    const morphColors = accessors[2];
    if (hasMorphPosition)
      geometry.morphAttributes.position = morphPositions;
    if (hasMorphNormal)
      geometry.morphAttributes.normal = morphNormals;
    if (hasMorphColor)
      geometry.morphAttributes.color = morphColors;
    geometry.morphTargetsRelative = true;
    return geometry;
  });
}
function updateMorphTargets(mesh, meshDef) {
  mesh.updateMorphTargets();
  if (meshDef.weights !== void 0) {
    for (let i = 0, il = meshDef.weights.length; i < il; i++) {
      mesh.morphTargetInfluences[i] = meshDef.weights[i];
    }
  }
  if (meshDef.extras && Array.isArray(meshDef.extras.targetNames)) {
    const targetNames = meshDef.extras.targetNames;
    if (mesh.morphTargetInfluences.length === targetNames.length) {
      mesh.morphTargetDictionary = {};
      for (let i = 0, il = targetNames.length; i < il; i++) {
        mesh.morphTargetDictionary[targetNames[i]] = i;
      }
    } else {
      console.warn("THREE.GLTFLoader: Invalid extras.targetNames length. Ignoring names.");
    }
  }
}
function createPrimitiveKey(primitiveDef) {
  let geometryKey;
  const dracoExtension = primitiveDef.extensions && primitiveDef.extensions[EXTENSIONS.KHR_DRACO_MESH_COMPRESSION];
  if (dracoExtension) {
    geometryKey = "draco:" + dracoExtension.bufferView + ":" + dracoExtension.indices + ":" + createAttributesKey(dracoExtension.attributes);
  } else {
    geometryKey = primitiveDef.indices + ":" + createAttributesKey(primitiveDef.attributes) + ":" + primitiveDef.mode;
  }
  if (primitiveDef.targets !== void 0) {
    for (let i = 0, il = primitiveDef.targets.length; i < il; i++) {
      geometryKey += ":" + createAttributesKey(primitiveDef.targets[i]);
    }
  }
  return geometryKey;
}
function createAttributesKey(attributes) {
  let attributesKey = "";
  const keys = Object.keys(attributes).sort();
  for (let i = 0, il = keys.length; i < il; i++) {
    attributesKey += keys[i] + ":" + attributes[keys[i]] + ";";
  }
  return attributesKey;
}
function getNormalizedComponentScale(constructor) {
  switch (constructor) {
    case Int8Array:
      return 1 / 127;
    case Uint8Array:
      return 1 / 255;
    case Int16Array:
      return 1 / 32767;
    case Uint16Array:
      return 1 / 65535;
    default:
      throw new Error("THREE.GLTFLoader: Unsupported normalized accessor component type.");
  }
}
function getImageURIMimeType(uri) {
  if (uri.search(/\.jpe?g($|\?)/i) > 0 || uri.search(/^data\:image\/jpeg/) === 0)
    return "image/jpeg";
  if (uri.search(/\.webp($|\?)/i) > 0 || uri.search(/^data\:image\/webp/) === 0)
    return "image/webp";
  return "image/png";
}
const _identityMatrix = new Matrix4();
class GLTFParser {
  constructor(json = {}, options = {}) {
    this.json = json;
    this.extensions = {};
    this.plugins = {};
    this.options = options;
    this.cache = new GLTFRegistry();
    this.associations = /* @__PURE__ */ new Map();
    this.primitiveCache = {};
    this.nodeCache = {};
    this.meshCache = { refs: {}, uses: {} };
    this.cameraCache = { refs: {}, uses: {} };
    this.lightCache = { refs: {}, uses: {} };
    this.sourceCache = {};
    this.textureCache = {};
    this.nodeNamesUsed = {};
    let isSafari = false;
    let isFirefox = false;
    let firefoxVersion = -1;
    if (typeof navigator !== "undefined") {
      isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent) === true;
      isFirefox = navigator.userAgent.indexOf("Firefox") > -1;
      firefoxVersion = isFirefox ? navigator.userAgent.match(/Firefox\/([0-9]+)\./)[1] : -1;
    }
    if (typeof createImageBitmap === "undefined" || isSafari || isFirefox && firefoxVersion < 98) {
      this.textureLoader = new TextureLoader(this.options.manager);
    } else {
      this.textureLoader = new ImageBitmapLoader(this.options.manager);
    }
    this.textureLoader.setCrossOrigin(this.options.crossOrigin);
    this.textureLoader.setRequestHeader(this.options.requestHeader);
    this.fileLoader = new FileLoader(this.options.manager);
    this.fileLoader.setResponseType("arraybuffer");
    if (this.options.crossOrigin === "use-credentials") {
      this.fileLoader.setWithCredentials(true);
    }
  }
  setExtensions(extensions) {
    this.extensions = extensions;
  }
  setPlugins(plugins) {
    this.plugins = plugins;
  }
  parse(onLoad, onError) {
    const parser = this;
    const json = this.json;
    const extensions = this.extensions;
    this.cache.removeAll();
    this.nodeCache = {};
    this._invokeAll(function(ext) {
      return ext._markDefs && ext._markDefs();
    });
    Promise.all(this._invokeAll(function(ext) {
      return ext.beforeRoot && ext.beforeRoot();
    })).then(function() {
      return Promise.all([
        parser.getDependencies("scene"),
        parser.getDependencies("animation"),
        parser.getDependencies("camera")
      ]);
    }).then(function(dependencies) {
      const result = {
        scene: dependencies[0][json.scene || 0],
        scenes: dependencies[0],
        animations: dependencies[1],
        cameras: dependencies[2],
        asset: json.asset,
        parser,
        userData: {}
      };
      addUnknownExtensionsToUserData(extensions, result, json);
      assignExtrasToUserData(result, json);
      Promise.all(parser._invokeAll(function(ext) {
        return ext.afterRoot && ext.afterRoot(result);
      })).then(function() {
        onLoad(result);
      });
    }).catch(onError);
  }
  /**
   * Marks the special nodes/meshes in json for efficient parse.
   */
  _markDefs() {
    const nodeDefs = this.json.nodes || [];
    const skinDefs = this.json.skins || [];
    const meshDefs = this.json.meshes || [];
    for (let skinIndex = 0, skinLength = skinDefs.length; skinIndex < skinLength; skinIndex++) {
      const joints = skinDefs[skinIndex].joints;
      for (let i = 0, il = joints.length; i < il; i++) {
        nodeDefs[joints[i]].isBone = true;
      }
    }
    for (let nodeIndex = 0, nodeLength = nodeDefs.length; nodeIndex < nodeLength; nodeIndex++) {
      const nodeDef = nodeDefs[nodeIndex];
      if (nodeDef.mesh !== void 0) {
        this._addNodeRef(this.meshCache, nodeDef.mesh);
        if (nodeDef.skin !== void 0) {
          meshDefs[nodeDef.mesh].isSkinnedMesh = true;
        }
      }
      if (nodeDef.camera !== void 0) {
        this._addNodeRef(this.cameraCache, nodeDef.camera);
      }
    }
  }
  /**
   * Counts references to shared node / Object3D resources. These resources
   * can be reused, or "instantiated", at multiple nodes in the scene
   * hierarchy. Mesh, Camera, and Light instances are instantiated and must
   * be marked. Non-scenegraph resources (like Materials, Geometries, and
   * Textures) can be reused directly and are not marked here.
   *
   * Example: CesiumMilkTruck sample model reuses "Wheel" meshes.
   */
  _addNodeRef(cache, index) {
    if (index === void 0)
      return;
    if (cache.refs[index] === void 0) {
      cache.refs[index] = cache.uses[index] = 0;
    }
    cache.refs[index]++;
  }
  /** Returns a reference to a shared resource, cloning it if necessary. */
  _getNodeRef(cache, index, object) {
    if (cache.refs[index] <= 1)
      return object;
    const ref = object.clone();
    const updateMappings = (original, clone) => {
      const mappings = this.associations.get(original);
      if (mappings != null) {
        this.associations.set(clone, mappings);
      }
      for (const [i, child] of original.children.entries()) {
        updateMappings(child, clone.children[i]);
      }
    };
    updateMappings(object, ref);
    ref.name += "_instance_" + cache.uses[index]++;
    return ref;
  }
  _invokeOne(func) {
    const extensions = Object.values(this.plugins);
    extensions.push(this);
    for (let i = 0; i < extensions.length; i++) {
      const result = func(extensions[i]);
      if (result)
        return result;
    }
    return null;
  }
  _invokeAll(func) {
    const extensions = Object.values(this.plugins);
    extensions.unshift(this);
    const pending = [];
    for (let i = 0; i < extensions.length; i++) {
      const result = func(extensions[i]);
      if (result)
        pending.push(result);
    }
    return pending;
  }
  /**
   * Requests the specified dependency asynchronously, with caching.
   * @param {string} type
   * @param {number} index
   * @return {Promise<Object3D|Material|THREE.Texture|AnimationClip|ArrayBuffer|Object>}
   */
  getDependency(type, index) {
    const cacheKey = type + ":" + index;
    let dependency = this.cache.get(cacheKey);
    if (!dependency) {
      switch (type) {
        case "scene":
          dependency = this.loadScene(index);
          break;
        case "node":
          dependency = this._invokeOne(function(ext) {
            return ext.loadNode && ext.loadNode(index);
          });
          break;
        case "mesh":
          dependency = this._invokeOne(function(ext) {
            return ext.loadMesh && ext.loadMesh(index);
          });
          break;
        case "accessor":
          dependency = this.loadAccessor(index);
          break;
        case "bufferView":
          dependency = this._invokeOne(function(ext) {
            return ext.loadBufferView && ext.loadBufferView(index);
          });
          break;
        case "buffer":
          dependency = this.loadBuffer(index);
          break;
        case "material":
          dependency = this._invokeOne(function(ext) {
            return ext.loadMaterial && ext.loadMaterial(index);
          });
          break;
        case "texture":
          dependency = this._invokeOne(function(ext) {
            return ext.loadTexture && ext.loadTexture(index);
          });
          break;
        case "skin":
          dependency = this.loadSkin(index);
          break;
        case "animation":
          dependency = this._invokeOne(function(ext) {
            return ext.loadAnimation && ext.loadAnimation(index);
          });
          break;
        case "camera":
          dependency = this.loadCamera(index);
          break;
        default:
          dependency = this._invokeOne(function(ext) {
            return ext != this && ext.getDependency && ext.getDependency(type, index);
          });
          if (!dependency) {
            throw new Error("Unknown type: " + type);
          }
          break;
      }
      this.cache.add(cacheKey, dependency);
    }
    return dependency;
  }
  /**
   * Requests all dependencies of the specified type asynchronously, with caching.
   * @param {string} type
   * @return {Promise<Array<Object>>}
   */
  getDependencies(type) {
    let dependencies = this.cache.get(type);
    if (!dependencies) {
      const parser = this;
      const defs = this.json[type + (type === "mesh" ? "es" : "s")] || [];
      dependencies = Promise.all(defs.map(function(def, index) {
        return parser.getDependency(type, index);
      }));
      this.cache.add(type, dependencies);
    }
    return dependencies;
  }
  /**
   * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#buffers-and-buffer-views
   * @param {number} bufferIndex
   * @return {Promise<ArrayBuffer>}
   */
  loadBuffer(bufferIndex) {
    const bufferDef = this.json.buffers[bufferIndex];
    const loader = this.fileLoader;
    if (bufferDef.type && bufferDef.type !== "arraybuffer") {
      throw new Error("THREE.GLTFLoader: " + bufferDef.type + " buffer type is not supported.");
    }
    if (bufferDef.uri === void 0 && bufferIndex === 0) {
      return Promise.resolve(this.extensions[EXTENSIONS.KHR_BINARY_GLTF].body);
    }
    const options = this.options;
    return new Promise(function(resolve, reject) {
      loader.load(LoaderUtils.resolveURL(bufferDef.uri, options.path), resolve, void 0, function() {
        reject(new Error('THREE.GLTFLoader: Failed to load buffer "' + bufferDef.uri + '".'));
      });
    });
  }
  /**
   * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#buffers-and-buffer-views
   * @param {number} bufferViewIndex
   * @return {Promise<ArrayBuffer>}
   */
  loadBufferView(bufferViewIndex) {
    const bufferViewDef = this.json.bufferViews[bufferViewIndex];
    return this.getDependency("buffer", bufferViewDef.buffer).then(function(buffer) {
      const byteLength = bufferViewDef.byteLength || 0;
      const byteOffset = bufferViewDef.byteOffset || 0;
      return buffer.slice(byteOffset, byteOffset + byteLength);
    });
  }
  /**
   * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#accessors
   * @param {number} accessorIndex
   * @return {Promise<BufferAttribute|InterleavedBufferAttribute>}
   */
  loadAccessor(accessorIndex) {
    const parser = this;
    const json = this.json;
    const accessorDef = this.json.accessors[accessorIndex];
    if (accessorDef.bufferView === void 0 && accessorDef.sparse === void 0) {
      const itemSize = WEBGL_TYPE_SIZES[accessorDef.type];
      const TypedArray = WEBGL_COMPONENT_TYPES[accessorDef.componentType];
      const normalized = accessorDef.normalized === true;
      const array = new TypedArray(accessorDef.count * itemSize);
      return Promise.resolve(new BufferAttribute(array, itemSize, normalized));
    }
    const pendingBufferViews = [];
    if (accessorDef.bufferView !== void 0) {
      pendingBufferViews.push(this.getDependency("bufferView", accessorDef.bufferView));
    } else {
      pendingBufferViews.push(null);
    }
    if (accessorDef.sparse !== void 0) {
      pendingBufferViews.push(this.getDependency("bufferView", accessorDef.sparse.indices.bufferView));
      pendingBufferViews.push(this.getDependency("bufferView", accessorDef.sparse.values.bufferView));
    }
    return Promise.all(pendingBufferViews).then(function(bufferViews) {
      const bufferView = bufferViews[0];
      const itemSize = WEBGL_TYPE_SIZES[accessorDef.type];
      const TypedArray = WEBGL_COMPONENT_TYPES[accessorDef.componentType];
      const elementBytes = TypedArray.BYTES_PER_ELEMENT;
      const itemBytes = elementBytes * itemSize;
      const byteOffset = accessorDef.byteOffset || 0;
      const byteStride = accessorDef.bufferView !== void 0 ? json.bufferViews[accessorDef.bufferView].byteStride : void 0;
      const normalized = accessorDef.normalized === true;
      let array, bufferAttribute;
      if (byteStride && byteStride !== itemBytes) {
        const ibSlice = Math.floor(byteOffset / byteStride);
        const ibCacheKey = "InterleavedBuffer:" + accessorDef.bufferView + ":" + accessorDef.componentType + ":" + ibSlice + ":" + accessorDef.count;
        let ib = parser.cache.get(ibCacheKey);
        if (!ib) {
          array = new TypedArray(bufferView, ibSlice * byteStride, accessorDef.count * byteStride / elementBytes);
          ib = new InterleavedBuffer(array, byteStride / elementBytes);
          parser.cache.add(ibCacheKey, ib);
        }
        bufferAttribute = new InterleavedBufferAttribute(ib, itemSize, byteOffset % byteStride / elementBytes, normalized);
      } else {
        if (bufferView === null) {
          array = new TypedArray(accessorDef.count * itemSize);
        } else {
          array = new TypedArray(bufferView, byteOffset, accessorDef.count * itemSize);
        }
        bufferAttribute = new BufferAttribute(array, itemSize, normalized);
      }
      if (accessorDef.sparse !== void 0) {
        const itemSizeIndices = WEBGL_TYPE_SIZES.SCALAR;
        const TypedArrayIndices = WEBGL_COMPONENT_TYPES[accessorDef.sparse.indices.componentType];
        const byteOffsetIndices = accessorDef.sparse.indices.byteOffset || 0;
        const byteOffsetValues = accessorDef.sparse.values.byteOffset || 0;
        const sparseIndices = new TypedArrayIndices(bufferViews[1], byteOffsetIndices, accessorDef.sparse.count * itemSizeIndices);
        const sparseValues = new TypedArray(bufferViews[2], byteOffsetValues, accessorDef.sparse.count * itemSize);
        if (bufferView !== null) {
          bufferAttribute = new BufferAttribute(bufferAttribute.array.slice(), bufferAttribute.itemSize, bufferAttribute.normalized);
        }
        for (let i = 0, il = sparseIndices.length; i < il; i++) {
          const index = sparseIndices[i];
          bufferAttribute.setX(index, sparseValues[i * itemSize]);
          if (itemSize >= 2)
            bufferAttribute.setY(index, sparseValues[i * itemSize + 1]);
          if (itemSize >= 3)
            bufferAttribute.setZ(index, sparseValues[i * itemSize + 2]);
          if (itemSize >= 4)
            bufferAttribute.setW(index, sparseValues[i * itemSize + 3]);
          if (itemSize >= 5)
            throw new Error("THREE.GLTFLoader: Unsupported itemSize in sparse BufferAttribute.");
        }
      }
      return bufferAttribute;
    });
  }
  /**
   * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#textures
   * @param {number} textureIndex
   * @return {Promise<THREE.Texture|null>}
   */
  loadTexture(textureIndex) {
    const json = this.json;
    const options = this.options;
    const textureDef = json.textures[textureIndex];
    const sourceIndex = textureDef.source;
    const sourceDef = json.images[sourceIndex];
    let loader = this.textureLoader;
    if (sourceDef.uri) {
      const handler = options.manager.getHandler(sourceDef.uri);
      if (handler !== null)
        loader = handler;
    }
    return this.loadTextureImage(textureIndex, sourceIndex, loader);
  }
  loadTextureImage(textureIndex, sourceIndex, loader) {
    const parser = this;
    const json = this.json;
    const textureDef = json.textures[textureIndex];
    const sourceDef = json.images[sourceIndex];
    const cacheKey = (sourceDef.uri || sourceDef.bufferView) + ":" + textureDef.sampler;
    if (this.textureCache[cacheKey]) {
      return this.textureCache[cacheKey];
    }
    const promise = this.loadImageSource(sourceIndex, loader).then(function(texture) {
      texture.flipY = false;
      texture.name = textureDef.name || sourceDef.name || "";
      if (texture.name === "" && typeof sourceDef.uri === "string" && sourceDef.uri.startsWith("data:image/") === false) {
        texture.name = sourceDef.uri;
      }
      const samplers = json.samplers || {};
      const sampler = samplers[textureDef.sampler] || {};
      texture.magFilter = WEBGL_FILTERS[sampler.magFilter] || LinearFilter;
      texture.minFilter = WEBGL_FILTERS[sampler.minFilter] || LinearMipmapLinearFilter;
      texture.wrapS = WEBGL_WRAPPINGS[sampler.wrapS] || RepeatWrapping;
      texture.wrapT = WEBGL_WRAPPINGS[sampler.wrapT] || RepeatWrapping;
      parser.associations.set(texture, { textures: textureIndex });
      return texture;
    }).catch(function() {
      return null;
    });
    this.textureCache[cacheKey] = promise;
    return promise;
  }
  loadImageSource(sourceIndex, loader) {
    const parser = this;
    const json = this.json;
    const options = this.options;
    if (this.sourceCache[sourceIndex] !== void 0) {
      return this.sourceCache[sourceIndex].then((texture) => texture.clone());
    }
    const sourceDef = json.images[sourceIndex];
    const URL = self.URL || self.webkitURL;
    let sourceURI = sourceDef.uri || "";
    let isObjectURL = false;
    if (sourceDef.bufferView !== void 0) {
      sourceURI = parser.getDependency("bufferView", sourceDef.bufferView).then(function(bufferView) {
        isObjectURL = true;
        const blob = new Blob([bufferView], { type: sourceDef.mimeType });
        sourceURI = URL.createObjectURL(blob);
        return sourceURI;
      });
    } else if (sourceDef.uri === void 0) {
      throw new Error("THREE.GLTFLoader: Image " + sourceIndex + " is missing URI and bufferView");
    }
    const promise = Promise.resolve(sourceURI).then(function(sourceURI2) {
      return new Promise(function(resolve, reject) {
        let onLoad = resolve;
        if (loader.isImageBitmapLoader === true) {
          onLoad = function(imageBitmap) {
            const texture = new Texture(imageBitmap);
            texture.needsUpdate = true;
            resolve(texture);
          };
        }
        loader.load(LoaderUtils.resolveURL(sourceURI2, options.path), onLoad, void 0, reject);
      });
    }).then(function(texture) {
      if (isObjectURL === true) {
        URL.revokeObjectURL(sourceURI);
      }
      texture.userData.mimeType = sourceDef.mimeType || getImageURIMimeType(sourceDef.uri);
      return texture;
    }).catch(function(error) {
      console.error("THREE.GLTFLoader: Couldn't load texture", sourceURI);
      throw error;
    });
    this.sourceCache[sourceIndex] = promise;
    return promise;
  }
  /**
   * Asynchronously assigns a texture to the given material parameters.
   * @param {Object} materialParams
   * @param {string} mapName
   * @param {Object} mapDef
   * @return {Promise<Texture>}
   */
  assignTexture(materialParams, mapName, mapDef, colorSpace) {
    const parser = this;
    return this.getDependency("texture", mapDef.index).then(function(texture) {
      if (!texture)
        return null;
      if (mapDef.texCoord !== void 0 && mapDef.texCoord > 0) {
        texture = texture.clone();
        texture.channel = mapDef.texCoord;
      }
      if (parser.extensions[EXTENSIONS.KHR_TEXTURE_TRANSFORM]) {
        const transform = mapDef.extensions !== void 0 ? mapDef.extensions[EXTENSIONS.KHR_TEXTURE_TRANSFORM] : void 0;
        if (transform) {
          const gltfReference = parser.associations.get(texture);
          texture = parser.extensions[EXTENSIONS.KHR_TEXTURE_TRANSFORM].extendTexture(texture, transform);
          parser.associations.set(texture, gltfReference);
        }
      }
      if (colorSpace !== void 0) {
        texture.colorSpace = colorSpace;
      }
      materialParams[mapName] = texture;
      return texture;
    });
  }
  /**
   * Assigns final material to a Mesh, Line, or Points instance. The instance
   * already has a material (generated from the glTF material options alone)
   * but reuse of the same glTF material may require multiple threejs materials
   * to accommodate different primitive types, defines, etc. New materials will
   * be created if necessary, and reused from a cache.
   * @param  {Object3D} mesh Mesh, Line, or Points instance.
   */
  assignFinalMaterial(mesh) {
    const geometry = mesh.geometry;
    let material = mesh.material;
    const useDerivativeTangents = geometry.attributes.tangent === void 0;
    const useVertexColors = geometry.attributes.color !== void 0;
    const useFlatShading = geometry.attributes.normal === void 0;
    if (mesh.isPoints) {
      const cacheKey = "PointsMaterial:" + material.uuid;
      let pointsMaterial = this.cache.get(cacheKey);
      if (!pointsMaterial) {
        pointsMaterial = new PointsMaterial();
        Material.prototype.copy.call(pointsMaterial, material);
        pointsMaterial.color.copy(material.color);
        pointsMaterial.map = material.map;
        pointsMaterial.sizeAttenuation = false;
        this.cache.add(cacheKey, pointsMaterial);
      }
      material = pointsMaterial;
    } else if (mesh.isLine) {
      const cacheKey = "LineBasicMaterial:" + material.uuid;
      let lineMaterial = this.cache.get(cacheKey);
      if (!lineMaterial) {
        lineMaterial = new LineBasicMaterial();
        Material.prototype.copy.call(lineMaterial, material);
        lineMaterial.color.copy(material.color);
        lineMaterial.map = material.map;
        this.cache.add(cacheKey, lineMaterial);
      }
      material = lineMaterial;
    }
    if (useDerivativeTangents || useVertexColors || useFlatShading) {
      let cacheKey = "ClonedMaterial:" + material.uuid + ":";
      if (useDerivativeTangents)
        cacheKey += "derivative-tangents:";
      if (useVertexColors)
        cacheKey += "vertex-colors:";
      if (useFlatShading)
        cacheKey += "flat-shading:";
      let cachedMaterial = this.cache.get(cacheKey);
      if (!cachedMaterial) {
        cachedMaterial = material.clone();
        if (useVertexColors)
          cachedMaterial.vertexColors = true;
        if (useFlatShading)
          cachedMaterial.flatShading = true;
        if (useDerivativeTangents) {
          if (cachedMaterial.normalScale)
            cachedMaterial.normalScale.y *= -1;
          if (cachedMaterial.clearcoatNormalScale)
            cachedMaterial.clearcoatNormalScale.y *= -1;
        }
        this.cache.add(cacheKey, cachedMaterial);
        this.associations.set(cachedMaterial, this.associations.get(material));
      }
      material = cachedMaterial;
    }
    mesh.material = material;
  }
  getMaterialType() {
    return MeshStandardMaterial;
  }
  /**
   * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#materials
   * @param {number} materialIndex
   * @return {Promise<Material>}
   */
  loadMaterial(materialIndex) {
    const parser = this;
    const json = this.json;
    const extensions = this.extensions;
    const materialDef = json.materials[materialIndex];
    let materialType;
    const materialParams = {};
    const materialExtensions = materialDef.extensions || {};
    const pending = [];
    if (materialExtensions[EXTENSIONS.KHR_MATERIALS_UNLIT]) {
      const kmuExtension = extensions[EXTENSIONS.KHR_MATERIALS_UNLIT];
      materialType = kmuExtension.getMaterialType();
      pending.push(kmuExtension.extendParams(materialParams, materialDef, parser));
    } else {
      const metallicRoughness = materialDef.pbrMetallicRoughness || {};
      materialParams.color = new Color(1, 1, 1);
      materialParams.opacity = 1;
      if (Array.isArray(metallicRoughness.baseColorFactor)) {
        const array = metallicRoughness.baseColorFactor;
        materialParams.color.fromArray(array);
        materialParams.opacity = array[3];
      }
      if (metallicRoughness.baseColorTexture !== void 0) {
        pending.push(parser.assignTexture(materialParams, "map", metallicRoughness.baseColorTexture, SRGBColorSpace));
      }
      materialParams.metalness = metallicRoughness.metallicFactor !== void 0 ? metallicRoughness.metallicFactor : 1;
      materialParams.roughness = metallicRoughness.roughnessFactor !== void 0 ? metallicRoughness.roughnessFactor : 1;
      if (metallicRoughness.metallicRoughnessTexture !== void 0) {
        pending.push(parser.assignTexture(materialParams, "metalnessMap", metallicRoughness.metallicRoughnessTexture));
        pending.push(parser.assignTexture(materialParams, "roughnessMap", metallicRoughness.metallicRoughnessTexture));
      }
      materialType = this._invokeOne(function(ext) {
        return ext.getMaterialType && ext.getMaterialType(materialIndex);
      });
      pending.push(Promise.all(this._invokeAll(function(ext) {
        return ext.extendMaterialParams && ext.extendMaterialParams(materialIndex, materialParams);
      })));
    }
    if (materialDef.doubleSided === true) {
      materialParams.side = DoubleSide;
    }
    const alphaMode = materialDef.alphaMode || ALPHA_MODES.OPAQUE;
    if (alphaMode === ALPHA_MODES.BLEND) {
      materialParams.transparent = true;
      materialParams.depthWrite = false;
    } else {
      materialParams.transparent = false;
      if (alphaMode === ALPHA_MODES.MASK) {
        materialParams.alphaTest = materialDef.alphaCutoff !== void 0 ? materialDef.alphaCutoff : 0.5;
      }
    }
    if (materialDef.normalTexture !== void 0 && materialType !== MeshBasicMaterial) {
      pending.push(parser.assignTexture(materialParams, "normalMap", materialDef.normalTexture));
      materialParams.normalScale = new Vector2(1, 1);
      if (materialDef.normalTexture.scale !== void 0) {
        const scale = materialDef.normalTexture.scale;
        materialParams.normalScale.set(scale, scale);
      }
    }
    if (materialDef.occlusionTexture !== void 0 && materialType !== MeshBasicMaterial) {
      pending.push(parser.assignTexture(materialParams, "aoMap", materialDef.occlusionTexture));
      if (materialDef.occlusionTexture.strength !== void 0) {
        materialParams.aoMapIntensity = materialDef.occlusionTexture.strength;
      }
    }
    if (materialDef.emissiveFactor !== void 0 && materialType !== MeshBasicMaterial) {
      materialParams.emissive = new Color().fromArray(materialDef.emissiveFactor);
    }
    if (materialDef.emissiveTexture !== void 0 && materialType !== MeshBasicMaterial) {
      pending.push(parser.assignTexture(materialParams, "emissiveMap", materialDef.emissiveTexture, SRGBColorSpace));
    }
    return Promise.all(pending).then(function() {
      const material = new materialType(materialParams);
      if (materialDef.name)
        material.name = materialDef.name;
      assignExtrasToUserData(material, materialDef);
      parser.associations.set(material, { materials: materialIndex });
      if (materialDef.extensions)
        addUnknownExtensionsToUserData(extensions, material, materialDef);
      return material;
    });
  }
  /** When Object3D instances are targeted by animation, they need unique names. */
  createUniqueName(originalName) {
    const sanitizedName = PropertyBinding.sanitizeNodeName(originalName || "");
    if (sanitizedName in this.nodeNamesUsed) {
      return sanitizedName + "_" + ++this.nodeNamesUsed[sanitizedName];
    } else {
      this.nodeNamesUsed[sanitizedName] = 0;
      return sanitizedName;
    }
  }
  /**
   * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#geometry
   *
   * Creates BufferGeometries from primitives.
   *
   * @param {Array<GLTF.Primitive>} primitives
   * @return {Promise<Array<BufferGeometry>>}
   */
  loadGeometries(primitives) {
    const parser = this;
    const extensions = this.extensions;
    const cache = this.primitiveCache;
    function createDracoPrimitive(primitive) {
      return extensions[EXTENSIONS.KHR_DRACO_MESH_COMPRESSION].decodePrimitive(primitive, parser).then(function(geometry) {
        return addPrimitiveAttributes(geometry, primitive, parser);
      });
    }
    const pending = [];
    for (let i = 0, il = primitives.length; i < il; i++) {
      const primitive = primitives[i];
      const cacheKey = createPrimitiveKey(primitive);
      const cached = cache[cacheKey];
      if (cached) {
        pending.push(cached.promise);
      } else {
        let geometryPromise;
        if (primitive.extensions && primitive.extensions[EXTENSIONS.KHR_DRACO_MESH_COMPRESSION]) {
          geometryPromise = createDracoPrimitive(primitive);
        } else {
          geometryPromise = addPrimitiveAttributes(new BufferGeometry(), primitive, parser);
        }
        cache[cacheKey] = { primitive, promise: geometryPromise };
        pending.push(geometryPromise);
      }
    }
    return Promise.all(pending);
  }
  /**
   * Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#meshes
   * @param {number} meshIndex
   * @return {Promise<Group|Mesh|SkinnedMesh>}
   */
  loadMesh(meshIndex) {
    const parser = this;
    const json = this.json;
    const extensions = this.extensions;
    const meshDef = json.meshes[meshIndex];
    const primitives = meshDef.primitives;
    const pending = [];
    for (let i = 0, il = primitives.length; i < il; i++) {
      const material = primitives[i].material === void 0 ? createDefaultMaterial(this.cache) : this.getDependency("material", primitives[i].material);
      pending.push(material);
    }
    pending.push(parser.loadGeometries(primitives));
    return Promise.all(pending).then(function(results) {
      const materials = results.slice(0, results.length - 1);
      const geometries = results[results.length - 1];
      const meshes = [];
      for (let i = 0, il = geometries.length; i < il; i++) {
        const geometry = geometries[i];
        const primitive = primitives[i];
        let mesh;
        const material = materials[i];
        if (primitive.mode === WEBGL_CONSTANTS.TRIANGLES || primitive.mode === WEBGL_CONSTANTS.TRIANGLE_STRIP || primitive.mode === WEBGL_CONSTANTS.TRIANGLE_FAN || primitive.mode === void 0) {
          mesh = meshDef.isSkinnedMesh === true ? new SkinnedMesh(geometry, material) : new Mesh(geometry, material);
          if (mesh.isSkinnedMesh === true) {
            mesh.normalizeSkinWeights();
          }
          if (primitive.mode === WEBGL_CONSTANTS.TRIANGLE_STRIP) {
            mesh.geometry = toTrianglesDrawMode(mesh.geometry, TriangleStripDrawMode);
          } else if (primitive.mode === WEBGL_CONSTANTS.TRIANGLE_FAN) {
            mesh.geometry = toTrianglesDrawMode(mesh.geometry, TriangleFanDrawMode);
          }
        } else if (primitive.mode === WEBGL_CONSTANTS.LINES) {
          mesh = new LineSegments(geometry, material);
        } else if (primitive.mode === WEBGL_CONSTANTS.LINE_STRIP) {
          mesh = new Line(geometry, material);
        } else if (primitive.mode === WEBGL_CONSTANTS.LINE_LOOP) {
          mesh = new LineLoop(geometry, material);
        } else if (primitive.mode === WEBGL_CONSTANTS.POINTS) {
          mesh = new Points(geometry, material);
        } else {
          throw new Error("THREE.GLTFLoader: Primitive mode unsupported: " + primitive.mode);
        }
        if (Object.keys(mesh.geometry.morphAttributes).length > 0) {
          updateMorphTargets(mesh, meshDef);
        }
        mesh.name = parser.createUniqueName(meshDef.name || "mesh_" + meshIndex);
        assignExtrasToUserData(mesh, meshDef);
        if (primitive.extensions)
          addUnknownExtensionsToUserData(extensions, mesh, primitive);
        parser.assignFinalMaterial(mesh);
        meshes.push(mesh);
      }
      for (let i = 0, il = meshes.length; i < il; i++) {
        parser.associations.set(meshes[i], {
          meshes: meshIndex,
          primitives: i
        });
      }
      if (meshes.length === 1) {
        if (meshDef.extensions)
          addUnknownExtensionsToUserData(extensions, meshes[0], meshDef);
        return meshes[0];
      }
      const group = new Group();
      if (meshDef.extensions)
        addUnknownExtensionsToUserData(extensions, group, meshDef);
      parser.associations.set(group, { meshes: meshIndex });
      for (let i = 0, il = meshes.length; i < il; i++) {
        group.add(meshes[i]);
      }
      return group;
    });
  }
  /**
   * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#cameras
   * @param {number} cameraIndex
   * @return {Promise<THREE.Camera>}
   */
  loadCamera(cameraIndex) {
    let camera;
    const cameraDef = this.json.cameras[cameraIndex];
    const params = cameraDef[cameraDef.type];
    if (!params) {
      console.warn("THREE.GLTFLoader: Missing camera parameters.");
      return;
    }
    if (cameraDef.type === "perspective") {
      camera = new PerspectiveCamera(MathUtils.radToDeg(params.yfov), params.aspectRatio || 1, params.znear || 1, params.zfar || 2e6);
    } else if (cameraDef.type === "orthographic") {
      camera = new OrthographicCamera(-params.xmag, params.xmag, params.ymag, -params.ymag, params.znear, params.zfar);
    }
    if (cameraDef.name)
      camera.name = this.createUniqueName(cameraDef.name);
    assignExtrasToUserData(camera, cameraDef);
    return Promise.resolve(camera);
  }
  /**
   * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#skins
   * @param {number} skinIndex
   * @return {Promise<Skeleton>}
   */
  loadSkin(skinIndex) {
    const skinDef = this.json.skins[skinIndex];
    const pending = [];
    for (let i = 0, il = skinDef.joints.length; i < il; i++) {
      pending.push(this._loadNodeShallow(skinDef.joints[i]));
    }
    if (skinDef.inverseBindMatrices !== void 0) {
      pending.push(this.getDependency("accessor", skinDef.inverseBindMatrices));
    } else {
      pending.push(null);
    }
    return Promise.all(pending).then(function(results) {
      const inverseBindMatrices = results.pop();
      const jointNodes = results;
      const bones = [];
      const boneInverses = [];
      for (let i = 0, il = jointNodes.length; i < il; i++) {
        const jointNode = jointNodes[i];
        if (jointNode) {
          bones.push(jointNode);
          const mat = new Matrix4();
          if (inverseBindMatrices !== null) {
            mat.fromArray(inverseBindMatrices.array, i * 16);
          }
          boneInverses.push(mat);
        } else {
          console.warn('THREE.GLTFLoader: Joint "%s" could not be found.', skinDef.joints[i]);
        }
      }
      return new Skeleton(bones, boneInverses);
    });
  }
  /**
   * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#animations
   * @param {number} animationIndex
   * @return {Promise<AnimationClip>}
   */
  loadAnimation(animationIndex) {
    const json = this.json;
    const parser = this;
    const animationDef = json.animations[animationIndex];
    const animationName = animationDef.name ? animationDef.name : "animation_" + animationIndex;
    const pendingNodes = [];
    const pendingInputAccessors = [];
    const pendingOutputAccessors = [];
    const pendingSamplers = [];
    const pendingTargets = [];
    for (let i = 0, il = animationDef.channels.length; i < il; i++) {
      const channel = animationDef.channels[i];
      const sampler = animationDef.samplers[channel.sampler];
      const target = channel.target;
      const name = target.node;
      const input = animationDef.parameters !== void 0 ? animationDef.parameters[sampler.input] : sampler.input;
      const output = animationDef.parameters !== void 0 ? animationDef.parameters[sampler.output] : sampler.output;
      if (target.node === void 0)
        continue;
      pendingNodes.push(this.getDependency("node", name));
      pendingInputAccessors.push(this.getDependency("accessor", input));
      pendingOutputAccessors.push(this.getDependency("accessor", output));
      pendingSamplers.push(sampler);
      pendingTargets.push(target);
    }
    return Promise.all([
      Promise.all(pendingNodes),
      Promise.all(pendingInputAccessors),
      Promise.all(pendingOutputAccessors),
      Promise.all(pendingSamplers),
      Promise.all(pendingTargets)
    ]).then(function(dependencies) {
      const nodes = dependencies[0];
      const inputAccessors = dependencies[1];
      const outputAccessors = dependencies[2];
      const samplers = dependencies[3];
      const targets = dependencies[4];
      const tracks = [];
      for (let i = 0, il = nodes.length; i < il; i++) {
        const node = nodes[i];
        const inputAccessor = inputAccessors[i];
        const outputAccessor = outputAccessors[i];
        const sampler = samplers[i];
        const target = targets[i];
        if (node === void 0)
          continue;
        if (node.updateMatrix) {
          node.updateMatrix();
          node.matrixAutoUpdate = true;
        }
        const createdTracks = parser._createAnimationTracks(node, inputAccessor, outputAccessor, sampler, target);
        if (createdTracks) {
          for (let k = 0; k < createdTracks.length; k++) {
            tracks.push(createdTracks[k]);
          }
        }
      }
      return new AnimationClip(animationName, void 0, tracks);
    });
  }
  createNodeMesh(nodeIndex) {
    const json = this.json;
    const parser = this;
    const nodeDef = json.nodes[nodeIndex];
    if (nodeDef.mesh === void 0)
      return null;
    return parser.getDependency("mesh", nodeDef.mesh).then(function(mesh) {
      const node = parser._getNodeRef(parser.meshCache, nodeDef.mesh, mesh);
      if (nodeDef.weights !== void 0) {
        node.traverse(function(o) {
          if (!o.isMesh)
            return;
          for (let i = 0, il = nodeDef.weights.length; i < il; i++) {
            o.morphTargetInfluences[i] = nodeDef.weights[i];
          }
        });
      }
      return node;
    });
  }
  /**
   * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#nodes-and-hierarchy
   * @param {number} nodeIndex
   * @return {Promise<Object3D>}
   */
  loadNode(nodeIndex) {
    const json = this.json;
    const parser = this;
    const nodeDef = json.nodes[nodeIndex];
    const nodePending = parser._loadNodeShallow(nodeIndex);
    const childPending = [];
    const childrenDef = nodeDef.children || [];
    for (let i = 0, il = childrenDef.length; i < il; i++) {
      childPending.push(parser.getDependency("node", childrenDef[i]));
    }
    const skeletonPending = nodeDef.skin === void 0 ? Promise.resolve(null) : parser.getDependency("skin", nodeDef.skin);
    return Promise.all([
      nodePending,
      Promise.all(childPending),
      skeletonPending
    ]).then(function(results) {
      const node = results[0];
      const children = results[1];
      const skeleton = results[2];
      if (skeleton !== null) {
        node.traverse(function(mesh) {
          if (!mesh.isSkinnedMesh)
            return;
          mesh.bind(skeleton, _identityMatrix);
        });
      }
      for (let i = 0, il = children.length; i < il; i++) {
        node.add(children[i]);
      }
      return node;
    });
  }
  // ._loadNodeShallow() parses a single node.
  // skin and child nodes are created and added in .loadNode() (no '_' prefix).
  _loadNodeShallow(nodeIndex) {
    const json = this.json;
    const extensions = this.extensions;
    const parser = this;
    if (this.nodeCache[nodeIndex] !== void 0) {
      return this.nodeCache[nodeIndex];
    }
    const nodeDef = json.nodes[nodeIndex];
    const nodeName = nodeDef.name ? parser.createUniqueName(nodeDef.name) : "";
    const pending = [];
    const meshPromise = parser._invokeOne(function(ext) {
      return ext.createNodeMesh && ext.createNodeMesh(nodeIndex);
    });
    if (meshPromise) {
      pending.push(meshPromise);
    }
    if (nodeDef.camera !== void 0) {
      pending.push(parser.getDependency("camera", nodeDef.camera).then(function(camera) {
        return parser._getNodeRef(parser.cameraCache, nodeDef.camera, camera);
      }));
    }
    parser._invokeAll(function(ext) {
      return ext.createNodeAttachment && ext.createNodeAttachment(nodeIndex);
    }).forEach(function(promise) {
      pending.push(promise);
    });
    this.nodeCache[nodeIndex] = Promise.all(pending).then(function(objects) {
      let node;
      if (nodeDef.isBone === true) {
        node = new Bone();
      } else if (objects.length > 1) {
        node = new Group();
      } else if (objects.length === 1) {
        node = objects[0];
      } else {
        node = new Object3D();
      }
      if (node !== objects[0]) {
        for (let i = 0, il = objects.length; i < il; i++) {
          node.add(objects[i]);
        }
      }
      if (nodeDef.name) {
        node.userData.name = nodeDef.name;
        node.name = nodeName;
      }
      assignExtrasToUserData(node, nodeDef);
      if (nodeDef.extensions)
        addUnknownExtensionsToUserData(extensions, node, nodeDef);
      if (nodeDef.matrix !== void 0) {
        const matrix = new Matrix4();
        matrix.fromArray(nodeDef.matrix);
        node.applyMatrix4(matrix);
      } else {
        if (nodeDef.translation !== void 0) {
          node.position.fromArray(nodeDef.translation);
        }
        if (nodeDef.rotation !== void 0) {
          node.quaternion.fromArray(nodeDef.rotation);
        }
        if (nodeDef.scale !== void 0) {
          node.scale.fromArray(nodeDef.scale);
        }
      }
      if (!parser.associations.has(node)) {
        parser.associations.set(node, {});
      }
      parser.associations.get(node).nodes = nodeIndex;
      return node;
    });
    return this.nodeCache[nodeIndex];
  }
  /**
   * Specification: https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#scenes
   * @param {number} sceneIndex
   * @return {Promise<Group>}
   */
  loadScene(sceneIndex) {
    const extensions = this.extensions;
    const sceneDef = this.json.scenes[sceneIndex];
    const parser = this;
    const scene = new Group();
    if (sceneDef.name)
      scene.name = parser.createUniqueName(sceneDef.name);
    assignExtrasToUserData(scene, sceneDef);
    if (sceneDef.extensions)
      addUnknownExtensionsToUserData(extensions, scene, sceneDef);
    const nodeIds = sceneDef.nodes || [];
    const pending = [];
    for (let i = 0, il = nodeIds.length; i < il; i++) {
      pending.push(parser.getDependency("node", nodeIds[i]));
    }
    return Promise.all(pending).then(function(nodes) {
      for (let i = 0, il = nodes.length; i < il; i++) {
        scene.add(nodes[i]);
      }
      const reduceAssociations = (node) => {
        const reducedAssociations = /* @__PURE__ */ new Map();
        for (const [key, value] of parser.associations) {
          if (key instanceof Material || key instanceof Texture) {
            reducedAssociations.set(key, value);
          }
        }
        node.traverse((node2) => {
          const mappings = parser.associations.get(node2);
          if (mappings != null) {
            reducedAssociations.set(node2, mappings);
          }
        });
        return reducedAssociations;
      };
      parser.associations = reduceAssociations(scene);
      return scene;
    });
  }
  _createAnimationTracks(node, inputAccessor, outputAccessor, sampler, target) {
    const tracks = [];
    const targetName = node.name ? node.name : node.uuid;
    const targetNames = [];
    if (PATH_PROPERTIES[target.path] === PATH_PROPERTIES.weights) {
      node.traverse(function(object) {
        if (object.morphTargetInfluences) {
          targetNames.push(object.name ? object.name : object.uuid);
        }
      });
    } else {
      targetNames.push(targetName);
    }
    let TypedKeyframeTrack;
    switch (PATH_PROPERTIES[target.path]) {
      case PATH_PROPERTIES.weights:
        TypedKeyframeTrack = NumberKeyframeTrack;
        break;
      case PATH_PROPERTIES.rotation:
        TypedKeyframeTrack = QuaternionKeyframeTrack;
        break;
      case PATH_PROPERTIES.position:
      case PATH_PROPERTIES.scale:
      default:
        switch (outputAccessor.itemSize) {
          case 1:
            TypedKeyframeTrack = NumberKeyframeTrack;
            break;
          case 2:
          case 3:
            TypedKeyframeTrack = VectorKeyframeTrack;
            break;
        }
        break;
    }
    const interpolation = sampler.interpolation !== void 0 ? INTERPOLATION[sampler.interpolation] : InterpolateLinear;
    const outputArray = this._getArrayFromAccessor(outputAccessor);
    for (let j = 0, jl = targetNames.length; j < jl; j++) {
      const track = new TypedKeyframeTrack(
        targetNames[j] + "." + PATH_PROPERTIES[target.path],
        inputAccessor.array,
        outputArray,
        interpolation
      );
      if (interpolation === "CUBICSPLINE") {
        this._createCubicSplineTrackInterpolant(track);
      }
      tracks.push(track);
    }
    return tracks;
  }
  _getArrayFromAccessor(accessor) {
    let outputArray = accessor.array;
    if (accessor.normalized) {
      const scale = getNormalizedComponentScale(outputArray.constructor);
      const scaled = new Float32Array(outputArray.length);
      for (let j = 0, jl = outputArray.length; j < jl; j++) {
        scaled[j] = outputArray[j] * scale;
      }
      outputArray = scaled;
    }
    return outputArray;
  }
  _createCubicSplineTrackInterpolant(track) {
    track.createInterpolant = function InterpolantFactoryMethodGLTFCubicSpline(result) {
      const interpolantType = this instanceof QuaternionKeyframeTrack ? GLTFCubicSplineQuaternionInterpolant : GLTFCubicSplineInterpolant;
      return new interpolantType(this.times, this.values, this.getValueSize() / 3, result);
    };
    track.createInterpolant.isInterpolantFactoryMethodGLTFCubicSpline = true;
  }
}
function computeBounds(geometry, primitiveDef, parser) {
  const attributes = primitiveDef.attributes;
  const box = new Box3();
  if (attributes.POSITION !== void 0) {
    const accessor = parser.json.accessors[attributes.POSITION];
    const min = accessor.min;
    const max = accessor.max;
    if (min !== void 0 && max !== void 0) {
      box.set(
        new Vector3(min[0], min[1], min[2]),
        new Vector3(max[0], max[1], max[2])
      );
      if (accessor.normalized) {
        const boxScale = getNormalizedComponentScale(WEBGL_COMPONENT_TYPES[accessor.componentType]);
        box.min.multiplyScalar(boxScale);
        box.max.multiplyScalar(boxScale);
      }
    } else {
      console.warn("THREE.GLTFLoader: Missing min/max properties for accessor POSITION.");
      return;
    }
  } else {
    return;
  }
  const targets = primitiveDef.targets;
  if (targets !== void 0) {
    const maxDisplacement = new Vector3();
    const vector = new Vector3();
    for (let i = 0, il = targets.length; i < il; i++) {
      const target = targets[i];
      if (target.POSITION !== void 0) {
        const accessor = parser.json.accessors[target.POSITION];
        const min = accessor.min;
        const max = accessor.max;
        if (min !== void 0 && max !== void 0) {
          vector.setX(Math.max(Math.abs(min[0]), Math.abs(max[0])));
          vector.setY(Math.max(Math.abs(min[1]), Math.abs(max[1])));
          vector.setZ(Math.max(Math.abs(min[2]), Math.abs(max[2])));
          if (accessor.normalized) {
            const boxScale = getNormalizedComponentScale(WEBGL_COMPONENT_TYPES[accessor.componentType]);
            vector.multiplyScalar(boxScale);
          }
          maxDisplacement.max(vector);
        } else {
          console.warn("THREE.GLTFLoader: Missing min/max properties for accessor POSITION.");
        }
      }
    }
    box.expandByVector(maxDisplacement);
  }
  geometry.boundingBox = box;
  const sphere = new Sphere();
  box.getCenter(sphere.center);
  sphere.radius = box.min.distanceTo(box.max) / 2;
  geometry.boundingSphere = sphere;
}
function addPrimitiveAttributes(geometry, primitiveDef, parser) {
  const attributes = primitiveDef.attributes;
  const pending = [];
  function assignAttributeAccessor(accessorIndex, attributeName) {
    return parser.getDependency("accessor", accessorIndex).then(function(accessor) {
      geometry.setAttribute(attributeName, accessor);
    });
  }
  for (const gltfAttributeName in attributes) {
    const threeAttributeName = ATTRIBUTES[gltfAttributeName] || gltfAttributeName.toLowerCase();
    if (threeAttributeName in geometry.attributes)
      continue;
    pending.push(assignAttributeAccessor(attributes[gltfAttributeName], threeAttributeName));
  }
  if (primitiveDef.indices !== void 0 && !geometry.index) {
    const accessor = parser.getDependency("accessor", primitiveDef.indices).then(function(accessor2) {
      geometry.setIndex(accessor2);
    });
    pending.push(accessor);
  }
  assignExtrasToUserData(geometry, primitiveDef);
  computeBounds(geometry, primitiveDef, parser);
  return Promise.all(pending).then(function() {
    return primitiveDef.targets !== void 0 ? addMorphTargets(geometry, primitiveDef.targets, parser) : geometry;
  });
}
export {
  GLTFLoader
};
//# sourceMappingURL=GLTFLoader.js.map
