text: import {
  	BufferGeometry
  } from "../../../build/three.module.js";
  
  /**
   * Export draco compressed files from threejs geometry objects.
   *
   * Draco files are compressed and usually are smaller than conventional 3D file formats.
   *
   * The exporter receives a options object containing
   *  - decodeSpeed, indicates how to tune the encoder regarding decode speed (0 gives better speed but worst quality)
   *  - encodeSpeed, indicates how to tune the encoder parameters (0 gives better speed but worst quality)
   *  - encoderMethod
   *  - quantization, indicates the presision of each type of data stored in the draco file in the order (POSITION, NORMAL, COLOR, TEX_COORD, GENERIC)
   *  - exportUvs
   *  - exportNormals
   */
  
  /* global DracoEncoderModule */
  
  var DRACOExporter = function () {};
  
  DRACOExporter.prototype = {
  
  	constructor: DRACOExporter,
  
  	parse: function ( object, options ) {
  
  		if ( object.isBufferGeometry === true || object.isGeometry === true ) {
  
  			throw new Error( 'DRACOExporter: The first parameter of parse() is now an instance of Mesh or Points.' );
  
  		}
  
  		if ( DracoEncoderModule === undefined ) {
  
  			throw new Error( 'THREE.DRACOExporter: required the draco_decoder to work.' );
  
  		}
  
  		if ( options === undefined ) {
  
  			options = {
  
  				decodeSpeed: 5,
  				encodeSpeed: 5,
  				encoderMethod: DRACOExporter.MESH_EDGEBREAKER_ENCODING,
  				quantization: [ 16, 8, 8, 8, 8 ],
  				exportUvs: true,
  				exportNormals: true,
  				exportColor: false,
  
  			};
  
  		}
  
  		var geometry = object.geometry;
  
  		var dracoEncoder = DracoEncoderModule();
  		var encoder = new dracoEncoder.Encoder();
  		var builder;
  		var dracoObject;
  
  		if ( geometry.isGeometry === true ) {
  
  			var bufferGeometry = new BufferGeometry();
  			bufferGeometry.setFromObject( object );
  			geometry = bufferGeometry;
  
  		}
  
  		if ( geometry.isBufferGeometry !== true ) {
  
  			throw new Error( 'THREE.DRACOExporter.parse(geometry, options): geometry is not a THREE.Geometry or BufferGeometry instance.' );
  
  		}
  
  		if ( object.isMesh === true ) {
  
  			builder = new dracoEncoder.MeshBuilder();
  			dracoObject = new dracoEncoder.Mesh();
  
  			var vertices = geometry.getAttribute( 'position' );
  			builder.AddFloatAttributeToMesh( dracoObject, dracoEncoder.POSITION, vertices.count, vertices.itemSize, vertices.array );
  
  			var faces = geometry.getIndex();
  
  			if ( faces !== null ) {
  
  				builder.AddFacesToMesh( dracoObject, faces.count / 3, faces.array );
  
  			} else {
  
  				var faces = new ( vertices.count > 65535 ? Uint32Array : Uint16Array )( vertices.count );
  
  				for ( var i = 0; i < faces.length; i ++ ) {
  
  					faces[ i ] = i;
  
  				}
  
  				builder.AddFacesToMesh( dracoObject, vertices.count, faces );
  
  			}
  
  			if ( options.exportNormals === true ) {
  
  				var normals = geometry.getAttribute( 'normal' );
  
  				if ( normals !== undefined ) {
  
  					builder.AddFloatAttributeToMesh( dracoObject, dracoEncoder.NORMAL, normals.count, normals.itemSize, normals.array );
  
  				}
  
  			}
  
  			if ( options.exportUvs === true ) {
  
  				var uvs = geometry.getAttribute( 'uv' );
  
  				if ( uvs !== undefined ) {
  
  					builder.AddFloatAttributeToMesh( dracoObject, dracoEncoder.TEX_COORD, uvs.count, uvs.itemSize, uvs.array );
  
  				}
  
  			}
  
  			if ( options.exportColor === true ) {
  
  				var colors = geometry.getAttribute( 'color' );
  
  				if ( colors !== undefined ) {
  
  					builder.AddFloatAttributeToMesh( dracoObject, dracoEncoder.COLOR, colors.count, colors.itemSize, colors.array );
  
  				}
  
  			}
  
  		} else if ( object.isPoints === true ) {
  
  			builder = new dracoEncoder.PointCloudBuilder();
  			dracoObject = new dracoEncoder.PointCloud();
  
  			var vertices = geometry.getAttribute( 'position' );
  			builder.AddFloatAttribute( dracoObject, dracoEncoder.POSITION, vertices.count, vertices.itemSize, vertices.array );
  
  			if ( options.exportColor === true ) {
  
  				var colors = geometry.getAttribute( 'color' );
  
  				if ( colors !== undefined ) {
  
  					builder.AddFloatAttribute( dracoObject, dracoEncoder.COLOR, colors.count, colors.itemSize, colors.array );
  
  				}
  
  			}
  
  		} else {
  
  			throw new Error( 'DRACOExporter: Unsupported object type.' );
  
  		}
  
  		//Compress using draco encoder
  
  		var encodedData = new dracoEncoder.DracoInt8Array();
  
  		//Sets the desired encoding and decoding speed for the given options from 0 (slowest speed, but the best compression) to 10 (fastest, but the worst compression).
  
  		var encodeSpeed = ( options.encodeSpeed !== undefined ) ? options.encodeSpeed : 5;
  		var decodeSpeed = ( options.decodeSpeed !== undefined ) ? options.decodeSpeed : 5;
  
  		encoder.SetSpeedOptions( encodeSpeed, decodeSpeed );
  
  		// Sets the desired encoding method for a given geometry.
  
  		if ( options.encoderMethod !== undefined ) {
  
  			encoder.SetEncodingMethod( options.encoderMethod );
  
  		}
  
  		// Sets the quantization (number of bits used to represent) compression options for a named attribute.
  		// The attribute values will be quantized in a box defined by the maximum extent of the attribute values.
  		if ( options.quantization !== undefined ) {
  
  			for ( var i = 0; i < 5; i ++ ) {
  
  				if ( options.quantization[ i ] !== undefined ) {
  
  					encoder.SetAttributeQuantization( i, options.quantization[ i ] );
  
  				}
  
  			}
  
  		}
  
  		var length;
  
  		if ( object.isMesh === true ) {
  
  			length = encoder.EncodeMeshToDracoBuffer( dracoObject, encodedData );
  
  		} else {
  
  			length = encoder.EncodePointCloudToDracoBuffer( dracoObject, true, encodedData );
  
  		}
  
  		dracoEncoder.destroy( dracoObject );
  
  		if ( length === 0 ) {
  
  			throw new Error( 'THREE.DRACOExporter: Draco encoding failed.' );
  
  		}
  
  		//Copy encoded data to buffer.
  		var outputData = new Int8Array( new ArrayBuffer( length ) );
  
  		for ( var i = 0; i < length; i ++ ) {
  
  			outputData[ i ] = encodedData.GetValue( i );
  
  		}
  
  		dracoEncoder.destroy( encodedData );
  		dracoEncoder.destroy( encoder );
  		dracoEncoder.destroy( builder );
  
  		return outputData;
  
  	}
  
  };
  
  // Encoder methods
  
  DRACOExporter.MESH_EDGEBREAKER_ENCODING = 1;
  DRACOExporter.MESH_SEQUENTIAL_ENCODING = 0;
  
  // Geometry type
  
  DRACOExporter.POINT_CLOUD = 0;
  DRACOExporter.TRIANGULAR_MESH = 1;
  
  // Attribute type
  
  DRACOExporter.INVALID = - 1;
  DRACOExporter.POSITION = 0;
  DRACOExporter.NORMAL = 1;
  DRACOExporter.COLOR = 2;
  DRACOExporter.TEX_COORD = 3;
  DRACOExporter.GENERIC = 4;
  
  export { DRACOExporter };
  