( function () {

	class VOXLoader extends THREE.Loader {

		load( url, onLoad, onProgress, onError ) {

			const scope = this;
			const loader = new THREE.FileLoader( scope.manager );
			loader.setPath( scope.path );
			loader.setResponseType( 'arraybuffer' );
			loader.setRequestHeader( scope.requestHeader );
			loader.load( url, function ( buffer ) {

				try {

					onLoad( scope.parse( buffer ) );

				} catch ( e ) {

					if ( onError ) {

						onError( e );

					} else {

						console.error( e );

					}

					scope.manager.itemError( url );

				}

			}, onProgress, onError );

		}

		parse( buffer ) {

			const data = new DataView( buffer );
			const id = data.getUint32( 0, true );
			const version = data.getUint32( 4, true );

			if ( id !== 542658390 || version !== 150 ) {

				console.error( 'Not a valid VOX file' );
				return;

			}

			const DEFAULT_PALETTE = [ 0x00000000, 0xffffffff, 0xffccffff, 0xff99ffff, 0xff66ffff, 0xff33ffff, 0xff00ffff, 0xffffccff, 0xffccccff, 0xff99ccff, 0xff66ccff, 0xff33ccff, 0xff00ccff, 0xffff99ff, 0xffcc99ff, 0xff9999ff, 0xff6699ff, 0xff3399ff, 0xff0099ff, 0xffff66ff, 0xffcc66ff, 0xff9966ff, 0xff6666ff, 0xff3366ff, 0xff0066ff, 0xffff33ff, 0xffcc33ff, 0xff9933ff, 0xff6633ff, 0xff3333ff, 0xff0033ff, 0xffff00ff, 0xffcc00ff, 0xff9900ff, 0xff6600ff, 0xff3300ff, 0xff0000ff, 0xffffffcc, 0xffccffcc, 0xff99ffcc, 0xff66ffcc, 0xff33ffcc, 0xff00ffcc, 0xffffcccc, 0xffcccccc, 0xff99cccc, 0xff66cccc, 0xff33cccc, 0xff00cccc, 0xffff99cc, 0xffcc99cc, 0xff9999cc, 0xff6699cc, 0xff3399cc, 0xff0099cc, 0xffff66cc, 0xffcc66cc, 0xff9966cc, 0xff6666cc, 0xff3366cc, 0xff0066cc, 0xffff33cc, 0xffcc33cc, 0xff9933cc, 0xff6633cc, 0xff3333cc, 0xff0033cc, 0xffff00cc, 0xffcc00cc, 0xff9900cc, 0xff6600cc, 0xff3300cc, 0xff0000cc, 0xffffff99, 0xffccff99, 0xff99ff99, 0xff66ff99, 0xff33ff99, 0xff00ff99, 0xffffcc99, 0xffcccc99, 0xff99cc99, 0xff66cc99, 0xff33cc99, 0xff00cc99, 0xffff9999, 0xffcc9999, 0xff999999, 0xff669999, 0xff339999, 0xff009999, 0xffff6699, 0xffcc6699, 0xff996699, 0xff666699, 0xff336699, 0xff006699, 0xffff3399, 0xffcc3399, 0xff993399, 0xff663399, 0xff333399, 0xff003399, 0xffff0099, 0xffcc0099, 0xff990099, 0xff660099, 0xff330099, 0xff000099, 0xffffff66, 0xffccff66, 0xff99ff66, 0xff66ff66, 0xff33ff66, 0xff00ff66, 0xffffcc66, 0xffcccc66, 0xff99cc66, 0xff66cc66, 0xff33cc66, 0xff00cc66, 0xffff9966, 0xffcc9966, 0xff999966, 0xff669966, 0xff339966, 0xff009966, 0xffff6666, 0xffcc6666, 0xff996666, 0xff666666, 0xff336666, 0xff006666, 0xffff3366, 0xffcc3366, 0xff993366, 0xff663366, 0xff333366, 0xff003366, 0xffff0066, 0xffcc0066, 0xff990066, 0xff660066, 0xff330066, 0xff000066, 0xffffff33, 0xffccff33, 0xff99ff33, 0xff66ff33, 0xff33ff33, 0xff00ff33, 0xffffcc33, 0xffcccc33, 0xff99cc33, 0xff66cc33, 0xff33cc33, 0xff00cc33, 0xffff9933, 0xffcc9933, 0xff999933, 0xff669933, 0xff339933, 0xff009933, 0xffff6633, 0xffcc6633, 0xff996633, 0xff666633, 0xff336633, 0xff006633, 0xffff3333, 0xffcc3333, 0xff993333, 0xff663333, 0xff333333, 0xff003333, 0xffff0033, 0xffcc0033, 0xff990033, 0xff660033, 0xff330033, 0xff000033, 0xffffff00, 0xffccff00, 0xff99ff00, 0xff66ff00, 0xff33ff00, 0xff00ff00, 0xffffcc00, 0xffcccc00, 0xff99cc00, 0xff66cc00, 0xff33cc00, 0xff00cc00, 0xffff9900, 0xffcc9900, 0xff999900, 0xff669900, 0xff339900, 0xff009900, 0xffff6600, 0xffcc6600, 0xff996600, 0xff666600, 0xff336600, 0xff006600, 0xffff3300, 0xffcc3300, 0xff993300, 0xff663300, 0xff333300, 0xff003300, 0xffff0000, 0xffcc0000, 0xff990000, 0xff660000, 0xff330000, 0xff0000ee, 0xff0000dd, 0xff0000bb, 0xff0000aa, 0xff000088, 0xff000077, 0xff000055, 0xff000044, 0xff000022, 0xff000011, 0xff00ee00, 0xff00dd00, 0xff00bb00, 0xff00aa00, 0xff008800, 0xff007700, 0xff005500, 0xff004400, 0xff002200, 0xff001100, 0xffee0000, 0xffdd0000, 0xffbb0000, 0xffaa0000, 0xff880000, 0xff770000, 0xff550000, 0xff440000, 0xff220000, 0xff110000, 0xffeeeeee, 0xffdddddd, 0xffbbbbbb, 0xffaaaaaa, 0xff888888, 0xff777777, 0xff555555, 0xff444444, 0xff222222, 0xff111111 ];
			let i = 8;
			let chunk;
			const chunks = [];

			while ( i < data.byteLength ) {

				let id = '';

				for ( let j = 0; j < 4; j ++ ) {

					id += String.fromCharCode( data.getUint8( i ++, true ) );

				}

				const chunkSize = data.getUint32( i, true );
				i += 4;
				data.getUint32( i, true );
				i += 4; // childChunks

				if ( id === 'SIZE' ) {

					const x = data.getUint32( i, true );
					i += 4;
					const y = data.getUint32( i, true );
					i += 4;
					const z = data.getUint32( i, true );
					i += 4;
					chunk = {
						palette: DEFAULT_PALETTE,
						size: {
							x: x,
							y: y,
							z: z
						}
					};
					chunks.push( chunk );
					i += chunkSize - 3 * 4;

				} else if ( id === 'XYZI' ) {

					const numVoxels = data.getUint32( i, true );
					i += 4;
					chunk.data = new Uint8Array( buffer, i, numVoxels * 4 );
					i += numVoxels * 4;

				} else if ( id === 'RGBA' ) {

					const palette = [ 0 ];

					for ( let j = 0; j < 256; j ++ ) {

						palette[ j + 1 ] = data.getUint32( i, true );
						i += 4;

					}

					chunk.palette = palette;

				} else {

					// console.log( id, chunkSize, childChunks );
					i += chunkSize;

				}

			}

			return chunks;

		}

	}

	class VOXMesh extends THREE.Mesh {

		constructor( chunk ) {

			const data = chunk.data;
			const size = chunk.size;
			const palette = chunk.palette; //

			const vertices = [];
			const colors = [];
			const nx = [ 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1 ];
			const px = [ 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 ];
			const py = [ 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1 ];
			const ny = [ 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0 ];
			const nz = [ 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0 ];
			const pz = [ 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1 ];

			function add( tile, x, y, z, r, g, b ) {

				x -= size.x / 2;
				y -= size.z / 2;
				z += size.y / 2;

				for ( let i = 0; i < 18; i += 3 ) {

					vertices.push( tile[ i + 0 ] + x, tile[ i + 1 ] + y, tile[ i + 2 ] + z );
					colors.push( r, g, b );

				}

			} // Store data in a volume for sampling


			const offsety = size.x;
			const offsetz = size.x * size.y;
			const array = new Uint8Array( size.x * size.y * size.z );

			for ( let j = 0; j < data.length; j += 4 ) {

				const x = data[ j + 0 ];
				const y = data[ j + 1 ];
				const z = data[ j + 2 ];
				const index = x + y * offsety + z * offsetz;
				array[ index ] = 255;

			} // Construct geometry


			let hasColors = false;

			for ( let j = 0; j < data.length; j += 4 ) {

				const x = data[ j + 0 ];
				const y = data[ j + 1 ];
				const z = data[ j + 2 ];
				const c = data[ j + 3 ];
				const hex = palette[ c ];
				const r = ( hex >> 0 & 0xff ) / 0xff;
				const g = ( hex >> 8 & 0xff ) / 0xff;
				const b = ( hex >> 16 & 0xff ) / 0xff;
				if ( r > 0 || g > 0 || b > 0 ) hasColors = true;
				const index = x + y * offsety + z * offsetz;
				if ( array[ index + 1 ] === 0 || x === size.x - 1 ) add( px, x, z, - y, r, g, b );
				if ( array[ index - 1 ] === 0 || x === 0 ) add( nx, x, z, - y, r, g, b );
				if ( array[ index + offsety ] === 0 || y === size.y - 1 ) add( ny, x, z, - y, r, g, b );
				if ( array[ index - offsety ] === 0 || y === 0 ) add( py, x, z, - y, r, g, b );
				if ( array[ index + offsetz ] === 0 || z === size.z - 1 ) add( pz, x, z, - y, r, g, b );
				if ( array[ index - offsetz ] === 0 || z === 0 ) add( nz, x, z, - y, r, g, b );

			}

			const geometry = new THREE.BufferGeometry();
			geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
			geometry.computeVertexNormals();
			const material = new THREE.MeshStandardMaterial();

			if ( hasColors ) {

				geometry.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );
				material.vertexColors = true;

			}

			super( geometry, material );

		}

	}

	class VOXDataTexture3D extends THREE.DataTexture3D {

		constructor( chunk ) {

			const data = chunk.data;
			const size = chunk.size;
			const offsety = size.x;
			const offsetz = size.x * size.y;
			const array = new Uint8Array( size.x * size.y * size.z );

			for ( let j = 0; j < data.length; j += 4 ) {

				const x = data[ j + 0 ];
				const y = data[ j + 1 ];
				const z = data[ j + 2 ];
				const index = x + y * offsety + z * offsetz;
				array[ index ] = 255;

			}

			super( array, size.x, size.y, size.z );
			this.format = THREE.RedFormat;
			this.minFilter = THREE.NearestFilter;
			this.magFilter = THREE.LinearFilter;
			this.unpackAlignment = 1;

		}

	}

	THREE.VOXDataTexture3D = VOXDataTexture3D;
	THREE.VOXLoader = VOXLoader;
	THREE.VOXMesh = VOXMesh;

} )();
