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{ DracoCompression } from \"@babylonjs/core/Meshes/Compression/dracoCompression\";\r\nimport { Nullable } from \"@babylonjs/core/types\";\r\nimport { VertexBuffer } from \"@babylonjs/core/Meshes/buffer\";\r\nimport { Geometry } from \"@babylonjs/core/Meshes/geometry\";\r\nimport { Mesh } from \"@babylonjs/core/Meshes/mesh\";\r\n\r\nimport { MeshPrimitiveMode } from \"babylonjs-gltf2interface\";\r\nimport { IBufferView, IMeshPrimitive } from \"../glTFLoaderInterfaces\";\r\nimport { IGLTFLoaderExtension } from \"../glTFLoaderExtension\";\r\nimport { GLTFLoader, ArrayItem } from \"../glTFLoader\";\r\n\r\nconst NAME = \"KHR_draco_mesh_compression\";\r\n\r\ninterface IKHRDracoMeshCompression {\r\n bufferView: number;\r\n attributes: { [name: string]: number };\r\n}\r\n\r\ninterface IBufferViewDraco extends IBufferView {\r\n _dracoBabylonGeometry?: Promise<Geometry>;\r\n}\r\n\r\n/**\r\n * [Specification](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_draco_mesh_compression)\r\n */\r\nexport class KHR_draco_mesh_compression implements IGLTFLoaderExtension {\r\n /** The name of this extension. */\r\n public readonly name = NAME;\r\n\r\n /** Defines whether this extension is enabled. */\r\n public enabled = DracoCompression.DecoderAvailable;\r\n\r\n private _loader: GLTFLoader;\r\n private _dracoCompression?: DracoCompression;\r\n\r\n /** @hidden */\r\n constructor(loader: GLTFLoader) {\r\n this._loader = loader;\r\n }\r\n\r\n /** @hidden */\r\n public dispose(): void {\r\n if (this._dracoCompression) {\r\n this._dracoCompression.dispose();\r\n delete this._dracoCompression;\r\n }\r\n\r\n delete this._loader;\r\n }\r\n\r\n /** @hidden */\r\n public _loadVertexDataAsync(context: string, primitive: IMeshPrimitive, babylonMesh: Mesh): Nullable<Promise<Geometry>> {\r\n return GLTFLoader.LoadExtensionAsync<IKHRDracoMeshCompression, Geometry>(context, primitive, this.name, (extensionContext, extension) => {\r\n if (primitive.mode != undefined) {\r\n if (primitive.mode !== MeshPrimitiveMode.TRIANGLE_STRIP &&\r\n primitive.mode !== MeshPrimitiveMode.TRIANGLES) {\r\n throw new Error(`${context}: Unsupported mode ${primitive.mode}`);\r\n }\r\n\r\n // TODO: handle triangle strips\r\n if (primitive.mode === MeshPrimitiveMode.TRIANGLE_STRIP) {\r\n throw new Error(`${context}: Mode ${primitive.mode} is not currently supported`);\r\n }\r\n }\r\n\r\n const attributes: { [kind: string]: number } = {};\r\n const loadAttribute = (name: string, kind: string) => {\r\n const uniqueId = extension.attributes[name];\r\n if (uniqueId == undefined) {\r\n return;\r\n }\r\n\r\n babylonMesh._delayInfo = babylonMesh._delayInfo || [];\r\n if (babylonMesh._delayInfo.indexOf(kind) === -1) {\r\n babylonMesh._delayInfo.push(kind);\r\n }\r\n\r\n attributes[kind] = uniqueId;\r\n };\r\n\r\n loadAttribute(\"POSITION\", VertexBuffer.PositionKind);\r\n loadAttribute(\"NORMAL\", VertexBuffer.NormalKind);\r\n loadAttribute(\"TANGENT\", VertexBuffer.TangentKind);\r\n loadAttribute(\"TEXCOORD_0\", VertexBuffer.UVKind);\r\n loadAttribute(\"TEXCOORD_1\", VertexBuffer.UV2Kind);\r\n loadAttribute(\"JOINTS_0\", VertexBuffer.MatricesIndicesKind);\r\n loadAttribute(\"WEIGHTS_0\", VertexBuffer.MatricesWeightsKind);\r\n loadAttribute(\"COLOR_0\", VertexBuffer.ColorKind);\r\n\r\n var bufferView = ArrayItem.Get(extensionContext, this._loader.gltf.bufferViews, extension.bufferView) as IBufferViewDraco;\r\n if (!bufferView._dracoBabylonGeometry) {\r\n bufferView._dracoBabylonGeometry = this._loader.loadBufferViewAsync(`#/bufferViews/${bufferView.index}`, bufferView).then((data) => {\r\n if (!this._dracoCompression) {\r\n this._dracoCompression = new DracoCompression();\r\n }\r\n\r\n return this._dracoCompression.decodeMeshAsync(data, attributes).then((babylonVertexData) => {\r\n const babylonGeometry = new Geometry(babylonMesh.name, this._loader.babylonScene);\r\n babylonVertexData.applyToGeometry(babylonGeometry);\r\n return babylonGeometry;\r\n }).catch((error) => {\r\n throw new Error(`${context}: ${error.message}`);\r\n });\r\n });\r\n }\r\n\r\n return bufferView._dracoBabylonGeometry;\r\n });\r\n }\r\n}\r\n\r\nGLTFLoader.RegisterExtension(NAME, (loader) => new KHR_draco_mesh_compression(loader));"]} |