| 1 | 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{ Nullable } from \"@babylonjs/core/types\";\nimport { Observable } from \"@babylonjs/core/Misc/observable\";\nimport { Deferred } from \"@babylonjs/core/Misc/deferred\";\nimport { Material } from \"@babylonjs/core/Materials/material\";\nimport { TransformNode } from \"@babylonjs/core/Meshes/transformNode\";\nimport { Mesh } from \"@babylonjs/core/Meshes/mesh\";\n\nimport { INode, IMaterial } from \"../glTFLoaderInterfaces\";\nimport { IGLTFLoaderExtension } from \"../glTFLoaderExtension\";\nimport { GLTFLoader, ArrayItem } from \"../glTFLoader\";\nimport { IProperty } from 'babylonjs-gltf2interface';\n\nconst NAME = \"MSFT_lod\";\n\ninterface IMSFTLOD {\n ids: number[];\n}\n\n/**\n * [Specification](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/MSFT_lod)\n */\nexport class MSFT_lod implements IGLTFLoaderExtension {\n /** The name of this extension. */\n public readonly name = NAME;\n\n /** Defines whether this extension is enabled. */\n public enabled = true;\n\n /**\n * Maximum number of LODs to load, starting from the lowest LOD.\n */\n public maxLODsToLoad = Number.MAX_VALUE;\n\n /**\n * Observable raised when all node LODs of one level are loaded.\n * The event data is the index of the loaded LOD starting from zero.\n * Dispose the loader to cancel the loading of the next level of LODs.\n */\n public onNodeLODsLoadedObservable = new Observable<number>();\n\n /**\n * Observable raised when all material LODs of one level are loaded.\n * The event data is the index of the loaded LOD starting from zero.\n * Dispose the loader to cancel the loading of the next level of LODs.\n */\n public onMaterialLODsLoadedObservable = new Observable<number>();\n\n private _loader: GLTFLoader;\n\n private _nodeIndexLOD: Nullable<number> = null;\n private _nodeSignalLODs = new Array<Deferred<void>>();\n private _nodePromiseLODs = new Array<Array<Promise<any>>>();\n\n private _materialIndexLOD: Nullable<number> = null;\n private _materialSignalLODs = new Array<Deferred<void>>();\n private _materialPromiseLODs = new Array<Array<Promise<any>>>();\n\n /** @hidden */\n constructor(loader: GLTFLoader) {\n this._loader = loader;\n }\n\n /** @hidden */\n public dispose() {\n delete this._loader;\n\n this._nodeIndexLOD = null;\n this._nodeSignalLODs.length = 0;\n this._nodePromiseLODs.length = 0;\n\n this._materialIndexLOD = null;\n this._materialSignalLODs.length = 0;\n this._materialPromiseLODs.length = 0;\n\n this.onMaterialLODsLoadedObservable.clear();\n this.onNodeLODsLoadedObservable.clear();\n }\n\n /** @hidden */\n public onReady(): void {\n for (let indexLOD = 0; indexLOD < this._nodePromiseLODs.length; indexLOD++) {\n const promise = Promise.all(this._nodePromiseLODs[indexLOD]).then(() => {\n if (indexLOD !== 0) {\n this._loader.endPerformanceCounter(`Node LOD ${indexLOD}`);\n }\n\n this._loader.log(`Loaded node LOD ${indexLOD}`);\n this.onNodeLODsLoadedObservable.notifyObservers(indexLOD);\n\n if (indexLOD !== this._nodePromiseLODs.length - 1) {\n this._loader.startPerformanceCounter(`Node LOD ${indexLOD + 1}`);\n if (this._nodeSignalLODs[indexLOD]) {\n this._nodeSignalLODs[indexLOD].resolve();\n }\n }\n });\n\n this._loader._completePromises.push(promise);\n }\n\n for (let indexLOD = 0; indexLOD < this._materialPromiseLODs.length; indexLOD++) {\n const promise = Promise.all(this._materialPromiseLODs[indexLOD]).then(() => {\n if (indexLOD !== 0) {\n this._loader.endPerformanceCounter(`Material LOD ${indexLOD}`);\n }\n\n this._loader.log(`Loaded material LOD ${indexLOD}`);\n this.onMaterialLODsLoadedObservable.notifyObservers(indexLOD);\n\n if (indexLOD !== this._materialPromiseLODs.length - 1) {\n this._loader.startPerformanceCounter(`Material LOD ${indexLOD + 1}`);\n if (this._materialSignalLODs[indexLOD]) {\n this._materialSignalLODs[indexLOD].resolve();\n }\n }\n });\n\n this._loader._completePromises.push(promise);\n }\n }\n\n /** @hidden */\n public loadNodeAsync(context: string, node: INode, assign: (babylonTransformNode: TransformNode) => void): Nullable<Promise<TransformNode>> {\n return GLTFLoader.LoadExtensionAsync<IMSFTLOD, TransformNode>(context, node, this.name, (extensionContext, extension) => {\n let firstPromise: Promise<TransformNode>;\n\n const nodeLODs = this._getLODs(extensionContext, node, this._loader.gltf.nodes, extension.ids);\n this._loader.logOpen(`${extensionContext}`);\n\n for (let indexLOD = 0; indexLOD < nodeLODs.length; indexLOD++) {\n const nodeLOD = nodeLODs[indexLOD];\n\n if (indexLOD !== 0) {\n this._nodeIndexLOD = indexLOD;\n this._nodeSignalLODs[indexLOD] = this._nodeSignalLODs[indexLOD] || new Deferred();\n }\n\n const assign = (babylonTransformNode: TransformNode) => { babylonTransformNode.setEnabled(false); };\n const promise = this._loader.loadNodeAsync(`#/nodes/${nodeLOD.index}`, nodeLOD, assign).then((babylonMesh) => {\n if (indexLOD !== 0) {\n // TODO: should not rely on _babylonMesh\n const previousNodeLOD = nodeLODs[indexLOD - 1];\n if (previousNodeLOD._babylonTransformNode) {\n previousNodeLOD._babylonTransformNode.dispose();\n delete previousNodeLOD._babylonTransformNode;\n this._disposeUnusedMaterials();\n }\n }\n\n babylonMesh.setEnabled(true);\n return babylonMesh;\n });\n\n if (indexLOD === 0) {\n firstPromise = promise;\n }\n else {\n this._nodeIndexLOD = null;\n }\n\n this._nodePromiseLODs[indexLOD] = this._nodePromiseLODs[indexLOD] || [];\n this._nodePromiseLODs[indexLOD].push(promise);\n }\n\n this._loader.logClose();\n return firstPromise!;\n });\n }\n\n /** @hidden */\n public _loadMaterialAsync(context: string, material: IMaterial, babylonMesh: Mesh, babylonDrawMode: number, assign: (babylonMaterial: Material) => void): Nullable<Promise<Material>> {\n // Don't load material LODs if already loading a node LOD.\n if (this._nodeIndexLOD) {\n return null;\n }\n\n return GLTFLoader.LoadExtensionAsync<IMSFTLOD, Material>(context, material, this.name, (extensionContext, extension) => {\n let firstPromise: Promise<Material>;\n\n const materialLODs = this._getLODs(extensionContext, material, this._loader.gltf.materials, extension.ids);\n this._loader.logOpen(`${extensionContext}`);\n\n for (let indexLOD = 0; indexLOD < materialLODs.length; indexLOD++) {\n const materialLOD = materialLODs[indexLOD];\n\n if (indexLOD !== 0) {\n this._materialIndexLOD = indexLOD;\n }\n\n const promise = this._loader._loadMaterialAsync(`#/materials/${materialLOD.index}`, materialLOD, babylonMesh, babylonDrawMode, (babylonMaterial) => {\n if (indexLOD === 0) {\n assign(babylonMaterial);\n }\n }).then((babylonMaterial) => {\n if (indexLOD !== 0) {\n assign(babylonMaterial);\n\n // TODO: should not rely on _data\n const previousDataLOD = materialLODs[indexLOD - 1]._data!;\n if (previousDataLOD[babylonDrawMode]) {\n previousDataLOD[babylonDrawMode].babylonMaterial.dispose();\n delete previousDataLOD[babylonDrawMode];\n }\n }\n\n return babylonMaterial;\n });\n\n if (indexLOD === 0) {\n firstPromise = promise;\n }\n else {\n this._materialIndexLOD = null;\n }\n\n this._materialPromiseLODs[indexLOD] = this._materialPromiseLODs[indexLOD] || [];\n this._materialPromiseLODs[indexLOD].push(promise);\n }\n\n this._loader.logClose();\n return firstPromise!;\n });\n }\n\n /** @hidden */\n public _loadUriAsync(context: string, property: IProperty, uri: string): Nullable<Promise<ArrayBufferView>> {\n // Defer the loading of uris if loading a material or node LOD.\n if (this._materialIndexLOD !== null) {\n this._loader.log(`deferred`);\n const previousIndexLOD = this._materialIndexLOD - 1;\n this._materialSignalLODs[previousIndexLOD] = this._materialSignalLODs[previousIndexLOD] || new Deferred<void>();\n return this._materialSignalLODs[previousIndexLOD].promise.then(() => {\n return this._loader.loadUriAsync(context, property, uri);\n });\n }\n else if (this._nodeIndexLOD !== null) {\n this._loader.log(`deferred`);\n const previousIndexLOD = this._nodeIndexLOD - 1;\n this._nodeSignalLODs[previousIndexLOD] = this._nodeSignalLODs[previousIndexLOD] || new Deferred<void>();\n return this._nodeSignalLODs[this._nodeIndexLOD - 1].promise.then(() => {\n return this._loader.loadUriAsync(context, property, uri);\n });\n }\n\n return null;\n }\n\n /**\n * Gets an array of LOD properties from lowest to highest.\n */\n private _getLODs<T>(context: string, property: T, array: ArrayLike<T> | undefined, ids: number[]): T[] {\n if (this.maxLODsToLoad <= 0) {\n throw new Error(\"maxLODsToLoad must be greater than zero\");\n }\n\n const properties = new Array<T>();\n\n for (let i = ids.length - 1; i >= 0; i--) {\n properties.push(ArrayItem.Get(`${context}/ids/${ids[i]}`, array, ids[i]));\n if (properties.length === this.maxLODsToLoad) {\n return properties;\n }\n }\n\n properties.push(property);\n return properties;\n }\n\n private _disposeUnusedMaterials(): void {\n // TODO: should not rely on _data\n const materials = this._loader.gltf.materials;\n if (materials) {\n for (const material of materials) {\n if (material._data) {\n for (const drawMode in material._data) {\n const data = material._data[drawMode];\n if (data.babylonMeshes.length === 0) {\n data.babylonMaterial.dispose(false, true);\n delete material._data[drawMode];\n }\n }\n }\n }\n }\n }\n}\n\nGLTFLoader.RegisterExtension(NAME, (loader) => new MSFT_lod(loader));"]} |