@babylonjs/loaders/glTF/2.0/Extensions/KHR_draco_mesh_compression.js

import { DracoCompression } from "@babylonjs/core/Meshes/Compression/dracoCompression";
import { VertexBuffer } from "@babylonjs/core/Meshes/buffer";
import { Geometry } from "@babylonjs/core/Meshes/geometry";
import { GLTFLoader, ArrayItem } from "../glTFLoader";
var NAME = "KHR_draco_mesh_compression";
/**
 * [Specification](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_draco_mesh_compression)
 */
var KHR_draco_mesh_compression = /** @class */ (function () {
    /** @hidden */
    function KHR_draco_mesh_compression(loader) {
        /** The name of this extension. */
        this.name = NAME;
        /** Defines whether this extension is enabled. */
        this.enabled = DracoCompression.DecoderAvailable;
        this._loader = loader;
    }
    /** @hidden */
    KHR_draco_mesh_compression.prototype.dispose = function () {
        if (this._dracoCompression) {
            this._dracoCompression.dispose();
            delete this._dracoCompression;
        }
        delete this._loader;
    };
    /** @hidden */
    KHR_draco_mesh_compression.prototype._loadVertexDataAsync = function (context, primitive, babylonMesh) {
        var _this = this;
        return GLTFLoader.LoadExtensionAsync(context, primitive, this.name, function (extensionContext, extension) {
            if (primitive.mode != undefined) {
                if (primitive.mode !== 5 /* TRIANGLE_STRIP */ &&
                    primitive.mode !== 4 /* TRIANGLES */) {
                    throw new Error(context + ": Unsupported mode " + primitive.mode);
                }
                // TODO: handle triangle strips
                if (primitive.mode === 5 /* TRIANGLE_STRIP */) {
                    throw new Error(context + ": Mode " + primitive.mode + " is not currently supported");
                }
            }
            var attributes = {};
            var loadAttribute = function (name, kind) {
                var uniqueId = extension.attributes[name];
                if (uniqueId == undefined) {
                    return;
                }
                babylonMesh._delayInfo = babylonMesh._delayInfo || [];
                if (babylonMesh._delayInfo.indexOf(kind) === -1) {
                    babylonMesh._delayInfo.push(kind);
                }
                attributes[kind] = uniqueId;
            };
            loadAttribute("POSITION", VertexBuffer.PositionKind);
            loadAttribute("NORMAL", VertexBuffer.NormalKind);
            loadAttribute("TANGENT", VertexBuffer.TangentKind);
            loadAttribute("TEXCOORD_0", VertexBuffer.UVKind);
            loadAttribute("TEXCOORD_1", VertexBuffer.UV2Kind);
            loadAttribute("JOINTS_0", VertexBuffer.MatricesIndicesKind);
            loadAttribute("WEIGHTS_0", VertexBuffer.MatricesWeightsKind);
            loadAttribute("COLOR_0", VertexBuffer.ColorKind);
            var bufferView = ArrayItem.Get(extensionContext, _this._loader.gltf.bufferViews, extension.bufferView);
            if (!bufferView._dracoBabylonGeometry) {
                bufferView._dracoBabylonGeometry = _this._loader.loadBufferViewAsync("#/bufferViews/" + bufferView.index, bufferView).then(function (data) {
                    if (!_this._dracoCompression) {
                        _this._dracoCompression = new DracoCompression();
                    }
                    return _this._dracoCompression.decodeMeshAsync(data, attributes).then(function (babylonVertexData) {
                        var babylonGeometry = new Geometry(babylonMesh.name, _this._loader.babylonScene);
                        babylonVertexData.applyToGeometry(babylonGeometry);
                        return babylonGeometry;
                    }).catch(function (error) {
                        throw new Error(context + ": " + error.message);
                    });
                });
            }
            return bufferView._dracoBabylonGeometry;
        });
    };
    return KHR_draco_mesh_compression;
}());
export { KHR_draco_mesh_compression };
GLTFLoader.RegisterExtension(NAME, function (loader) { return new KHR_draco_mesh_compression(loader); });
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