three.js/examples/js/loaders/EXRLoader.js

( function () {

	/**
 * OpenEXR loader currently supports uncompressed, ZIP(S), RLE, PIZ and DWA/B compression.
 * Supports reading as UnsignedByte, HalfFloat and Float type data texture.
 *
 * Referred to the original Industrial Light & Magic OpenEXR implementation and the TinyEXR / Syoyo Fujita
 * implementation, so I have preserved their copyright notices.
 */
	// /*
	// Copyright (c) 2014 - 2017, Syoyo Fujita
	// All rights reserved.
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are met:
	//     * Redistributions of source code must retain the above copyright
	//       notice, this list of conditions and the following disclaimer.
	//     * Redistributions in binary form must reproduce the above copyright
	//       notice, this list of conditions and the following disclaimer in the
	//       documentation and/or other materials provided with the distribution.
	//     * Neither the name of the Syoyo Fujita nor the
	//       names of its contributors may be used to endorse or promote products
	//       derived from this software without specific prior written permission.
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
	// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	// DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
	// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	// */
	// // TinyEXR contains some OpenEXR code, which is licensed under ------------
	// ///////////////////////////////////////////////////////////////////////////
	// //
	// // Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
	// // Digital Ltd. LLC
	// //
	// // All rights reserved.
	// //
	// // Redistribution and use in source and binary forms, with or without
	// // modification, are permitted provided that the following conditions are
	// // met:
	// // *       Redistributions of source code must retain the above copyright
	// // notice, this list of conditions and the following disclaimer.
	// // *       Redistributions in binary form must reproduce the above
	// // copyright notice, this list of conditions and the following disclaimer
	// // in the documentation and/or other materials provided with the
	// // distribution.
	// // *       Neither the name of Industrial Light & Magic nor the names of
	// // its contributors may be used to endorse or promote products derived
	// // from this software without specific prior written permission.
	// //
	// // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	// // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	// // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	// // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	// // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	// // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	// // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	// // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	// // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	// // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	// //
	// ///////////////////////////////////////////////////////////////////////////
	// // End of OpenEXR license -------------------------------------------------

	class EXRLoader extends THREE.DataTextureLoader {

		constructor( manager ) {

			super( manager );
			this.type = THREE.HalfFloatType;

		}

		parse( buffer ) {

			const USHORT_RANGE = 1 << 16;
			const BITMAP_SIZE = USHORT_RANGE >> 3;
			const HUF_ENCBITS = 16; // literal (value) bit length

			const HUF_DECBITS = 14; // decoding bit size (>= 8)

			const HUF_ENCSIZE = ( 1 << HUF_ENCBITS ) + 1; // encoding table size

			const HUF_DECSIZE = 1 << HUF_DECBITS; // decoding table size

			const HUF_DECMASK = HUF_DECSIZE - 1;
			const NBITS = 16;
			const A_OFFSET = 1 << NBITS - 1;
			const MOD_MASK = ( 1 << NBITS ) - 1;
			const SHORT_ZEROCODE_RUN = 59;
			const LONG_ZEROCODE_RUN = 63;
			const SHORTEST_LONG_RUN = 2 + LONG_ZEROCODE_RUN - SHORT_ZEROCODE_RUN;
			const ULONG_SIZE = 8;
			const FLOAT32_SIZE = 4;
			const INT32_SIZE = 4;
			const INT16_SIZE = 2;
			const INT8_SIZE = 1;
			const STATIC_HUFFMAN = 0;
			const DEFLATE = 1;
			const UNKNOWN = 0;
			const LOSSY_DCT = 1;
			const RLE = 2;
			const logBase = Math.pow( 2.7182818, 2.2 );

			function reverseLutFromBitmap( bitmap, lut ) {

				let k = 0;

				for ( let i = 0; i < USHORT_RANGE; ++ i ) {

					if ( i == 0 || bitmap[ i >> 3 ] & 1 << ( i & 7 ) ) {

						lut[ k ++ ] = i;

					}

				}

				const n = k - 1;

				while ( k < USHORT_RANGE ) lut[ k ++ ] = 0;

				return n;

			}

			function hufClearDecTable( hdec ) {

				for ( let i = 0; i < HUF_DECSIZE; i ++ ) {

					hdec[ i ] = {};
					hdec[ i ].len = 0;
					hdec[ i ].lit = 0;
					hdec[ i ].p = null;

				}

			}

			const getBitsReturn = {
				l: 0,
				c: 0,
				lc: 0
			};

			function getBits( nBits, c, lc, uInt8Array, inOffset ) {

				while ( lc < nBits ) {

					c = c << 8 | parseUint8Array( uInt8Array, inOffset );
					lc += 8;

				}

				lc -= nBits;
				getBitsReturn.l = c >> lc & ( 1 << nBits ) - 1;
				getBitsReturn.c = c;
				getBitsReturn.lc = lc;

			}

			const hufTableBuffer = new Array( 59 );

			function hufCanonicalCodeTable( hcode ) {

				for ( let i = 0; i <= 58; ++ i ) hufTableBuffer[ i ] = 0;

				for ( let i = 0; i < HUF_ENCSIZE; ++ i ) hufTableBuffer[ hcode[ i ] ] += 1;

				let c = 0;

				for ( let i = 58; i > 0; -- i ) {

					const nc = c + hufTableBuffer[ i ] >> 1;
					hufTableBuffer[ i ] = c;
					c = nc;

				}

				for ( let i = 0; i < HUF_ENCSIZE; ++ i ) {

					const l = hcode[ i ];
					if ( l > 0 ) hcode[ i ] = l | hufTableBuffer[ l ] ++ << 6;

				}

			}

			function hufUnpackEncTable( uInt8Array, inOffset, ni, im, iM, hcode ) {

				const p = inOffset;
				let c = 0;
				let lc = 0;

				for ( ; im <= iM; im ++ ) {

					if ( p.value - inOffset.value > ni ) return false;
					getBits( 6, c, lc, uInt8Array, p );
					const l = getBitsReturn.l;
					c = getBitsReturn.c;
					lc = getBitsReturn.lc;
					hcode[ im ] = l;

					if ( l == LONG_ZEROCODE_RUN ) {

						if ( p.value - inOffset.value > ni ) {

							throw new Error( 'Something wrong with hufUnpackEncTable' );

						}

						getBits( 8, c, lc, uInt8Array, p );
						let zerun = getBitsReturn.l + SHORTEST_LONG_RUN;
						c = getBitsReturn.c;
						lc = getBitsReturn.lc;

						if ( im + zerun > iM + 1 ) {

							throw new Error( 'Something wrong with hufUnpackEncTable' );

						}

						while ( zerun -- ) hcode[ im ++ ] = 0;

						im --;

					} else if ( l >= SHORT_ZEROCODE_RUN ) {

						let zerun = l - SHORT_ZEROCODE_RUN + 2;

						if ( im + zerun > iM + 1 ) {

							throw new Error( 'Something wrong with hufUnpackEncTable' );

						}

						while ( zerun -- ) hcode[ im ++ ] = 0;

						im --;

					}

				}

				hufCanonicalCodeTable( hcode );

			}

			function hufLength( code ) {

				return code & 63;

			}

			function hufCode( code ) {

				return code >> 6;

			}

			function hufBuildDecTable( hcode, im, iM, hdecod ) {

				for ( ; im <= iM; im ++ ) {

					const c = hufCode( hcode[ im ] );
					const l = hufLength( hcode[ im ] );

					if ( c >> l ) {

						throw new Error( 'Invalid table entry' );

					}

					if ( l > HUF_DECBITS ) {

						const pl = hdecod[ c >> l - HUF_DECBITS ];

						if ( pl.len ) {

							throw new Error( 'Invalid table entry' );

						}

						pl.lit ++;

						if ( pl.p ) {

							const p = pl.p;
							pl.p = new Array( pl.lit );

							for ( let i = 0; i < pl.lit - 1; ++ i ) {

								pl.p[ i ] = p[ i ];

							}

						} else {

							pl.p = new Array( 1 );

						}

						pl.p[ pl.lit - 1 ] = im;

					} else if ( l ) {

						let plOffset = 0;

						for ( let i = 1 << HUF_DECBITS - l; i > 0; i -- ) {

							const pl = hdecod[ ( c << HUF_DECBITS - l ) + plOffset ];

							if ( pl.len || pl.p ) {

								throw new Error( 'Invalid table entry' );

							}

							pl.len = l;
							pl.lit = im;
							plOffset ++;

						}

					}

				}

				return true;

			}

			const getCharReturn = {
				c: 0,
				lc: 0
			};

			function getChar( c, lc, uInt8Array, inOffset ) {

				c = c << 8 | parseUint8Array( uInt8Array, inOffset );
				lc += 8;
				getCharReturn.c = c;
				getCharReturn.lc = lc;

			}

			const getCodeReturn = {
				c: 0,
				lc: 0
			};

			function getCode( po, rlc, c, lc, uInt8Array, inOffset, outBuffer, outBufferOffset, outBufferEndOffset ) {

				if ( po == rlc ) {

					if ( lc < 8 ) {

						getChar( c, lc, uInt8Array, inOffset );
						c = getCharReturn.c;
						lc = getCharReturn.lc;

					}

					lc -= 8;
					let cs = c >> lc;
					cs = new Uint8Array( [ cs ] )[ 0 ];

					if ( outBufferOffset.value + cs > outBufferEndOffset ) {

						return false;

					}

					const s = outBuffer[ outBufferOffset.value - 1 ];

					while ( cs -- > 0 ) {

						outBuffer[ outBufferOffset.value ++ ] = s;

					}

				} else if ( outBufferOffset.value < outBufferEndOffset ) {

					outBuffer[ outBufferOffset.value ++ ] = po;

				} else {

					return false;

				}

				getCodeReturn.c = c;
				getCodeReturn.lc = lc;

			}

			function UInt16( value ) {

				return value & 0xFFFF;

			}

			function Int16( value ) {

				const ref = UInt16( value );
				return ref > 0x7FFF ? ref - 0x10000 : ref;

			}

			const wdec14Return = {
				a: 0,
				b: 0
			};

			function wdec14( l, h ) {

				const ls = Int16( l );
				const hs = Int16( h );
				const hi = hs;
				const ai = ls + ( hi & 1 ) + ( hi >> 1 );
				const as = ai;
				const bs = ai - hi;
				wdec14Return.a = as;
				wdec14Return.b = bs;

			}

			function wdec16( l, h ) {

				const m = UInt16( l );
				const d = UInt16( h );
				const bb = m - ( d >> 1 ) & MOD_MASK;
				const aa = d + bb - A_OFFSET & MOD_MASK;
				wdec14Return.a = aa;
				wdec14Return.b = bb;

			}

			function wav2Decode( buffer, j, nx, ox, ny, oy, mx ) {

				const w14 = mx < 1 << 14;
				const n = nx > ny ? ny : nx;
				let p = 1;
				let p2;
				let py;

				while ( p <= n ) p <<= 1;

				p >>= 1;
				p2 = p;
				p >>= 1;

				while ( p >= 1 ) {

					py = 0;
					const ey = py + oy * ( ny - p2 );
					const oy1 = oy * p;
					const oy2 = oy * p2;
					const ox1 = ox * p;
					const ox2 = ox * p2;
					let i00, i01, i10, i11;

					for ( ; py <= ey; py += oy2 ) {

						let px = py;
						const ex = py + ox * ( nx - p2 );

						for ( ; px <= ex; px += ox2 ) {

							const p01 = px + ox1;
							const p10 = px + oy1;
							const p11 = p10 + ox1;

							if ( w14 ) {

								wdec14( buffer[ px + j ], buffer[ p10 + j ] );
								i00 = wdec14Return.a;
								i10 = wdec14Return.b;
								wdec14( buffer[ p01 + j ], buffer[ p11 + j ] );
								i01 = wdec14Return.a;
								i11 = wdec14Return.b;
								wdec14( i00, i01 );
								buffer[ px + j ] = wdec14Return.a;
								buffer[ p01 + j ] = wdec14Return.b;
								wdec14( i10, i11 );
								buffer[ p10 + j ] = wdec14Return.a;
								buffer[ p11 + j ] = wdec14Return.b;

							} else {

								wdec16( buffer[ px + j ], buffer[ p10 + j ] );
								i00 = wdec14Return.a;
								i10 = wdec14Return.b;
								wdec16( buffer[ p01 + j ], buffer[ p11 + j ] );
								i01 = wdec14Return.a;
								i11 = wdec14Return.b;
								wdec16( i00, i01 );
								buffer[ px + j ] = wdec14Return.a;
								buffer[ p01 + j ] = wdec14Return.b;
								wdec16( i10, i11 );
								buffer[ p10 + j ] = wdec14Return.a;
								buffer[ p11 + j ] = wdec14Return.b;

							}

						}

						if ( nx & p ) {

							const p10 = px + oy1;
							if ( w14 ) wdec14( buffer[ px + j ], buffer[ p10 + j ] ); else wdec16( buffer[ px + j ], buffer[ p10 + j ] );
							i00 = wdec14Return.a;
							buffer[ p10 + j ] = wdec14Return.b;
							buffer[ px + j ] = i00;

						}

					}

					if ( ny & p ) {

						let px = py;
						const ex = py + ox * ( nx - p2 );

						for ( ; px <= ex; px += ox2 ) {

							const p01 = px + ox1;
							if ( w14 ) wdec14( buffer[ px + j ], buffer[ p01 + j ] ); else wdec16( buffer[ px + j ], buffer[ p01 + j ] );
							i00 = wdec14Return.a;
							buffer[ p01 + j ] = wdec14Return.b;
							buffer[ px + j ] = i00;

						}

					}

					p2 = p;
					p >>= 1;

				}

				return py;

			}

			function hufDecode( encodingTable, decodingTable, uInt8Array, inOffset, ni, rlc, no, outBuffer, outOffset ) {

				let c = 0;
				let lc = 0;
				const outBufferEndOffset = no;
				const inOffsetEnd = Math.trunc( inOffset.value + ( ni + 7 ) / 8 );

				while ( inOffset.value < inOffsetEnd ) {

					getChar( c, lc, uInt8Array, inOffset );
					c = getCharReturn.c;
					lc = getCharReturn.lc;

					while ( lc >= HUF_DECBITS ) {

						const index = c >> lc - HUF_DECBITS & HUF_DECMASK;
						const pl = decodingTable[ index ];

						if ( pl.len ) {

							lc -= pl.len;
							getCode( pl.lit, rlc, c, lc, uInt8Array, inOffset, outBuffer, outOffset, outBufferEndOffset );
							c = getCodeReturn.c;
							lc = getCodeReturn.lc;

						} else {

							if ( ! pl.p ) {

								throw new Error( 'hufDecode issues' );

							}

							let j;

							for ( j = 0; j < pl.lit; j ++ ) {

								const l = hufLength( encodingTable[ pl.p[ j ] ] );

								while ( lc < l && inOffset.value < inOffsetEnd ) {

									getChar( c, lc, uInt8Array, inOffset );
									c = getCharReturn.c;
									lc = getCharReturn.lc;

								}

								if ( lc >= l ) {

									if ( hufCode( encodingTable[ pl.p[ j ] ] ) == ( c >> lc - l & ( 1 << l ) - 1 ) ) {

										lc -= l;
										getCode( pl.p[ j ], rlc, c, lc, uInt8Array, inOffset, outBuffer, outOffset, outBufferEndOffset );
										c = getCodeReturn.c;
										lc = getCodeReturn.lc;
										break;

									}

								}

							}

							if ( j == pl.lit ) {

								throw new Error( 'hufDecode issues' );

							}

						}

					}

				}

				const i = 8 - ni & 7;
				c >>= i;
				lc -= i;

				while ( lc > 0 ) {

					const pl = decodingTable[ c << HUF_DECBITS - lc & HUF_DECMASK ];

					if ( pl.len ) {

						lc -= pl.len;
						getCode( pl.lit, rlc, c, lc, uInt8Array, inOffset, outBuffer, outOffset, outBufferEndOffset );
						c = getCodeReturn.c;
						lc = getCodeReturn.lc;

					} else {

						throw new Error( 'hufDecode issues' );

					}

				}

				return true;

			}

			function hufUncompress( uInt8Array, inDataView, inOffset, nCompressed, outBuffer, nRaw ) {

				const outOffset = {
					value: 0
				};
				const initialInOffset = inOffset.value;
				const im = parseUint32( inDataView, inOffset );
				const iM = parseUint32( inDataView, inOffset );
				inOffset.value += 4;
				const nBits = parseUint32( inDataView, inOffset );
				inOffset.value += 4;

				if ( im < 0 || im >= HUF_ENCSIZE || iM < 0 || iM >= HUF_ENCSIZE ) {

					throw new Error( 'Something wrong with HUF_ENCSIZE' );

				}

				const freq = new Array( HUF_ENCSIZE );
				const hdec = new Array( HUF_DECSIZE );
				hufClearDecTable( hdec );
				const ni = nCompressed - ( inOffset.value - initialInOffset );
				hufUnpackEncTable( uInt8Array, inOffset, ni, im, iM, freq );

				if ( nBits > 8 * ( nCompressed - ( inOffset.value - initialInOffset ) ) ) {

					throw new Error( 'Something wrong with hufUncompress' );

				}

				hufBuildDecTable( freq, im, iM, hdec );
				hufDecode( freq, hdec, uInt8Array, inOffset, nBits, iM, nRaw, outBuffer, outOffset );

			}

			function applyLut( lut, data, nData ) {

				for ( let i = 0; i < nData; ++ i ) {

					data[ i ] = lut[ data[ i ] ];

				}

			}

			function predictor( source ) {

				for ( let t = 1; t < source.length; t ++ ) {

					const d = source[ t - 1 ] + source[ t ] - 128;
					source[ t ] = d;

				}

			}

			function interleaveScalar( source, out ) {

				let t1 = 0;
				let t2 = Math.floor( ( source.length + 1 ) / 2 );
				let s = 0;
				const stop = source.length - 1;

				while ( true ) {

					if ( s > stop ) break;
					out[ s ++ ] = source[ t1 ++ ];
					if ( s > stop ) break;
					out[ s ++ ] = source[ t2 ++ ];

				}

			}

			function decodeRunLength( source ) {

				let size = source.byteLength;
				const out = new Array();
				let p = 0;
				const reader = new DataView( source );

				while ( size > 0 ) {

					const l = reader.getInt8( p ++ );

					if ( l < 0 ) {

						const count = - l;
						size -= count + 1;

						for ( let i = 0; i < count; i ++ ) {

							out.push( reader.getUint8( p ++ ) );

						}

					} else {

						const count = l;
						size -= 2;
						const value = reader.getUint8( p ++ );

						for ( let i = 0; i < count + 1; i ++ ) {

							out.push( value );

						}

					}

				}

				return out;

			}

			function lossyDctDecode( cscSet, rowPtrs, channelData, acBuffer, dcBuffer, outBuffer ) {

				let dataView = new DataView( outBuffer.buffer );
				const width = channelData[ cscSet.idx[ 0 ] ].width;
				const height = channelData[ cscSet.idx[ 0 ] ].height;
				const numComp = 3;
				const numFullBlocksX = Math.floor( width / 8.0 );
				const numBlocksX = Math.ceil( width / 8.0 );
				const numBlocksY = Math.ceil( height / 8.0 );
				const leftoverX = width - ( numBlocksX - 1 ) * 8;
				const leftoverY = height - ( numBlocksY - 1 ) * 8;
				const currAcComp = {
					value: 0
				};
				const currDcComp = new Array( numComp );
				const dctData = new Array( numComp );
				const halfZigBlock = new Array( numComp );
				const rowBlock = new Array( numComp );
				const rowOffsets = new Array( numComp );

				for ( let comp = 0; comp < numComp; ++ comp ) {

					rowOffsets[ comp ] = rowPtrs[ cscSet.idx[ comp ] ];
					currDcComp[ comp ] = comp < 1 ? 0 : currDcComp[ comp - 1 ] + numBlocksX * numBlocksY;
					dctData[ comp ] = new Float32Array( 64 );
					halfZigBlock[ comp ] = new Uint16Array( 64 );
					rowBlock[ comp ] = new Uint16Array( numBlocksX * 64 );

				}

				for ( let blocky = 0; blocky < numBlocksY; ++ blocky ) {

					let maxY = 8;
					if ( blocky == numBlocksY - 1 ) maxY = leftoverY;
					let maxX = 8;

					for ( let blockx = 0; blockx < numBlocksX; ++ blockx ) {

						if ( blockx == numBlocksX - 1 ) maxX = leftoverX;

						for ( let comp = 0; comp < numComp; ++ comp ) {

							halfZigBlock[ comp ].fill( 0 ); // set block DC component

							halfZigBlock[ comp ][ 0 ] = dcBuffer[ currDcComp[ comp ] ++ ]; // set block AC components

							unRleAC( currAcComp, acBuffer, halfZigBlock[ comp ] ); // UnZigZag block to float

							unZigZag( halfZigBlock[ comp ], dctData[ comp ] ); // decode float dct

							dctInverse( dctData[ comp ] );

						}

						if ( numComp == 3 ) {

							csc709Inverse( dctData );

						}

						for ( let comp = 0; comp < numComp; ++ comp ) {

							convertToHalf( dctData[ comp ], rowBlock[ comp ], blockx * 64 );

						}

					} // blockx


					let offset = 0;

					for ( let comp = 0; comp < numComp; ++ comp ) {

						const type = channelData[ cscSet.idx[ comp ] ].type;

						for ( let y = 8 * blocky; y < 8 * blocky + maxY; ++ y ) {

							offset = rowOffsets[ comp ][ y ];

							for ( let blockx = 0; blockx < numFullBlocksX; ++ blockx ) {

								const src = blockx * 64 + ( y & 0x7 ) * 8;
								dataView.setUint16( offset + 0 * INT16_SIZE * type, rowBlock[ comp ][ src + 0 ], true );
								dataView.setUint16( offset + 1 * INT16_SIZE * type, rowBlock[ comp ][ src + 1 ], true );
								dataView.setUint16( offset + 2 * INT16_SIZE * type, rowBlock[ comp ][ src + 2 ], true );
								dataView.setUint16( offset + 3 * INT16_SIZE * type, rowBlock[ comp ][ src + 3 ], true );
								dataView.setUint16( offset + 4 * INT16_SIZE * type, rowBlock[ comp ][ src + 4 ], true );
								dataView.setUint16( offset + 5 * INT16_SIZE * type, rowBlock[ comp ][ src + 5 ], true );
								dataView.setUint16( offset + 6 * INT16_SIZE * type, rowBlock[ comp ][ src + 6 ], true );
								dataView.setUint16( offset + 7 * INT16_SIZE * type, rowBlock[ comp ][ src + 7 ], true );
								offset += 8 * INT16_SIZE * type;

							}

						} // handle partial X blocks


						if ( numFullBlocksX != numBlocksX ) {

							for ( let y = 8 * blocky; y < 8 * blocky + maxY; ++ y ) {

								const offset = rowOffsets[ comp ][ y ] + 8 * numFullBlocksX * INT16_SIZE * type;
								const src = numFullBlocksX * 64 + ( y & 0x7 ) * 8;

								for ( let x = 0; x < maxX; ++ x ) {

									dataView.setUint16( offset + x * INT16_SIZE * type, rowBlock[ comp ][ src + x ], true );

								}

							}

						}

					} // comp

				} // blocky


				const halfRow = new Uint16Array( width );
				dataView = new DataView( outBuffer.buffer ); // convert channels back to float, if needed

				for ( let comp = 0; comp < numComp; ++ comp ) {

					channelData[ cscSet.idx[ comp ] ].decoded = true;
					const type = channelData[ cscSet.idx[ comp ] ].type;
					if ( channelData[ comp ].type != 2 ) continue;

					for ( let y = 0; y < height; ++ y ) {

						const offset = rowOffsets[ comp ][ y ];

						for ( let x = 0; x < width; ++ x ) {

							halfRow[ x ] = dataView.getUint16( offset + x * INT16_SIZE * type, true );

						}

						for ( let x = 0; x < width; ++ x ) {

							dataView.setFloat32( offset + x * INT16_SIZE * type, decodeFloat16( halfRow[ x ] ), true );

						}

					}

				}

			}

			function unRleAC( currAcComp, acBuffer, halfZigBlock ) {

				let acValue;
				let dctComp = 1;

				while ( dctComp < 64 ) {

					acValue = acBuffer[ currAcComp.value ];

					if ( acValue == 0xff00 ) {

						dctComp = 64;

					} else if ( acValue >> 8 == 0xff ) {

						dctComp += acValue & 0xff;

					} else {

						halfZigBlock[ dctComp ] = acValue;
						dctComp ++;

					}

					currAcComp.value ++;

				}

			}

			function unZigZag( src, dst ) {

				dst[ 0 ] = decodeFloat16( src[ 0 ] );
				dst[ 1 ] = decodeFloat16( src[ 1 ] );
				dst[ 2 ] = decodeFloat16( src[ 5 ] );
				dst[ 3 ] = decodeFloat16( src[ 6 ] );
				dst[ 4 ] = decodeFloat16( src[ 14 ] );
				dst[ 5 ] = decodeFloat16( src[ 15 ] );
				dst[ 6 ] = decodeFloat16( src[ 27 ] );
				dst[ 7 ] = decodeFloat16( src[ 28 ] );
				dst[ 8 ] = decodeFloat16( src[ 2 ] );
				dst[ 9 ] = decodeFloat16( src[ 4 ] );
				dst[ 10 ] = decodeFloat16( src[ 7 ] );
				dst[ 11 ] = decodeFloat16( src[ 13 ] );
				dst[ 12 ] = decodeFloat16( src[ 16 ] );
				dst[ 13 ] = decodeFloat16( src[ 26 ] );
				dst[ 14 ] = decodeFloat16( src[ 29 ] );
				dst[ 15 ] = decodeFloat16( src[ 42 ] );
				dst[ 16 ] = decodeFloat16( src[ 3 ] );
				dst[ 17 ] = decodeFloat16( src[ 8 ] );
				dst[ 18 ] = decodeFloat16( src[ 12 ] );
				dst[ 19 ] = decodeFloat16( src[ 17 ] );
				dst[ 20 ] = decodeFloat16( src[ 25 ] );
				dst[ 21 ] = decodeFloat16( src[ 30 ] );
				dst[ 22 ] = decodeFloat16( src[ 41 ] );
				dst[ 23 ] = decodeFloat16( src[ 43 ] );
				dst[ 24 ] = decodeFloat16( src[ 9 ] );
				dst[ 25 ] = decodeFloat16( src[ 11 ] );
				dst[ 26 ] = decodeFloat16( src[ 18 ] );
				dst[ 27 ] = decodeFloat16( src[ 24 ] );
				dst[ 28 ] = decodeFloat16( src[ 31 ] );
				dst[ 29 ] = decodeFloat16( src[ 40 ] );
				dst[ 30 ] = decodeFloat16( src[ 44 ] );
				dst[ 31 ] = decodeFloat16( src[ 53 ] );
				dst[ 32 ] = decodeFloat16( src[ 10 ] );
				dst[ 33 ] = decodeFloat16( src[ 19 ] );
				dst[ 34 ] = decodeFloat16( src[ 23 ] );
				dst[ 35 ] = decodeFloat16( src[ 32 ] );
				dst[ 36 ] = decodeFloat16( src[ 39 ] );
				dst[ 37 ] = decodeFloat16( src[ 45 ] );
				dst[ 38 ] = decodeFloat16( src[ 52 ] );
				dst[ 39 ] = decodeFloat16( src[ 54 ] );
				dst[ 40 ] = decodeFloat16( src[ 20 ] );
				dst[ 41 ] = decodeFloat16( src[ 22 ] );
				dst[ 42 ] = decodeFloat16( src[ 33 ] );
				dst[ 43 ] = decodeFloat16( src[ 38 ] );
				dst[ 44 ] = decodeFloat16( src[ 46 ] );
				dst[ 45 ] = decodeFloat16( src[ 51 ] );
				dst[ 46 ] = decodeFloat16( src[ 55 ] );
				dst[ 47 ] = decodeFloat16( src[ 60 ] );
				dst[ 48 ] = decodeFloat16( src[ 21 ] );
				dst[ 49 ] = decodeFloat16( src[ 34 ] );
				dst[ 50 ] = decodeFloat16( src[ 37 ] );
				dst[ 51 ] = decodeFloat16( src[ 47 ] );
				dst[ 52 ] = decodeFloat16( src[ 50 ] );
				dst[ 53 ] = decodeFloat16( src[ 56 ] );
				dst[ 54 ] = decodeFloat16( src[ 59 ] );
				dst[ 55 ] = decodeFloat16( src[ 61 ] );
				dst[ 56 ] = decodeFloat16( src[ 35 ] );
				dst[ 57 ] = decodeFloat16( src[ 36 ] );
				dst[ 58 ] = decodeFloat16( src[ 48 ] );
				dst[ 59 ] = decodeFloat16( src[ 49 ] );
				dst[ 60 ] = decodeFloat16( src[ 57 ] );
				dst[ 61 ] = decodeFloat16( src[ 58 ] );
				dst[ 62 ] = decodeFloat16( src[ 62 ] );
				dst[ 63 ] = decodeFloat16( src[ 63 ] );

			}

			function dctInverse( data ) {

				const a = 0.5 * Math.cos( 3.14159 / 4.0 );
				const b = 0.5 * Math.cos( 3.14159 / 16.0 );
				const c = 0.5 * Math.cos( 3.14159 / 8.0 );
				const d = 0.5 * Math.cos( 3.0 * 3.14159 / 16.0 );
				const e = 0.5 * Math.cos( 5.0 * 3.14159 / 16.0 );
				const f = 0.5 * Math.cos( 3.0 * 3.14159 / 8.0 );
				const g = 0.5 * Math.cos( 7.0 * 3.14159 / 16.0 );
				const alpha = new Array( 4 );
				const beta = new Array( 4 );
				const theta = new Array( 4 );
				const gamma = new Array( 4 );

				for ( let row = 0; row < 8; ++ row ) {

					const rowPtr = row * 8;
					alpha[ 0 ] = c * data[ rowPtr + 2 ];
					alpha[ 1 ] = f * data[ rowPtr + 2 ];
					alpha[ 2 ] = c * data[ rowPtr + 6 ];
					alpha[ 3 ] = f * data[ rowPtr + 6 ];
					beta[ 0 ] = b * data[ rowPtr + 1 ] + d * data[ rowPtr + 3 ] + e * data[ rowPtr + 5 ] + g * data[ rowPtr + 7 ];
					beta[ 1 ] = d * data[ rowPtr + 1 ] - g * data[ rowPtr + 3 ] - b * data[ rowPtr + 5 ] - e * data[ rowPtr + 7 ];
					beta[ 2 ] = e * data[ rowPtr + 1 ] - b * data[ rowPtr + 3 ] + g * data[ rowPtr + 5 ] + d * data[ rowPtr + 7 ];
					beta[ 3 ] = g * data[ rowPtr + 1 ] - e * data[ rowPtr + 3 ] + d * data[ rowPtr + 5 ] - b * data[ rowPtr + 7 ];
					theta[ 0 ] = a * ( data[ rowPtr + 0 ] + data[ rowPtr + 4 ] );
					theta[ 3 ] = a * ( data[ rowPtr + 0 ] - data[ rowPtr + 4 ] );
					theta[ 1 ] = alpha[ 0 ] + alpha[ 3 ];
					theta[ 2 ] = alpha[ 1 ] - alpha[ 2 ];
					gamma[ 0 ] = theta[ 0 ] + theta[ 1 ];
					gamma[ 1 ] = theta[ 3 ] + theta[ 2 ];
					gamma[ 2 ] = theta[ 3 ] - theta[ 2 ];
					gamma[ 3 ] = theta[ 0 ] - theta[ 1 ];
					data[ rowPtr + 0 ] = gamma[ 0 ] + beta[ 0 ];
					data[ rowPtr + 1 ] = gamma[ 1 ] + beta[ 1 ];
					data[ rowPtr + 2 ] = gamma[ 2 ] + beta[ 2 ];
					data[ rowPtr + 3 ] = gamma[ 3 ] + beta[ 3 ];
					data[ rowPtr + 4 ] = gamma[ 3 ] - beta[ 3 ];
					data[ rowPtr + 5 ] = gamma[ 2 ] - beta[ 2 ];
					data[ rowPtr + 6 ] = gamma[ 1 ] - beta[ 1 ];
					data[ rowPtr + 7 ] = gamma[ 0 ] - beta[ 0 ];

				}

				for ( let column = 0; column < 8; ++ column ) {

					alpha[ 0 ] = c * data[ 16 + column ];
					alpha[ 1 ] = f * data[ 16 + column ];
					alpha[ 2 ] = c * data[ 48 + column ];
					alpha[ 3 ] = f * data[ 48 + column ];
					beta[ 0 ] = b * data[ 8 + column ] + d * data[ 24 + column ] + e * data[ 40 + column ] + g * data[ 56 + column ];
					beta[ 1 ] = d * data[ 8 + column ] - g * data[ 24 + column ] - b * data[ 40 + column ] - e * data[ 56 + column ];
					beta[ 2 ] = e * data[ 8 + column ] - b * data[ 24 + column ] + g * data[ 40 + column ] + d * data[ 56 + column ];
					beta[ 3 ] = g * data[ 8 + column ] - e * data[ 24 + column ] + d * data[ 40 + column ] - b * data[ 56 + column ];
					theta[ 0 ] = a * ( data[ column ] + data[ 32 + column ] );
					theta[ 3 ] = a * ( data[ column ] - data[ 32 + column ] );
					theta[ 1 ] = alpha[ 0 ] + alpha[ 3 ];
					theta[ 2 ] = alpha[ 1 ] - alpha[ 2 ];
					gamma[ 0 ] = theta[ 0 ] + theta[ 1 ];
					gamma[ 1 ] = theta[ 3 ] + theta[ 2 ];
					gamma[ 2 ] = theta[ 3 ] - theta[ 2 ];
					gamma[ 3 ] = theta[ 0 ] - theta[ 1 ];
					data[ 0 + column ] = gamma[ 0 ] + beta[ 0 ];
					data[ 8 + column ] = gamma[ 1 ] + beta[ 1 ];
					data[ 16 + column ] = gamma[ 2 ] + beta[ 2 ];
					data[ 24 + column ] = gamma[ 3 ] + beta[ 3 ];
					data[ 32 + column ] = gamma[ 3 ] - beta[ 3 ];
					data[ 40 + column ] = gamma[ 2 ] - beta[ 2 ];
					data[ 48 + column ] = gamma[ 1 ] - beta[ 1 ];
					data[ 56 + column ] = gamma[ 0 ] - beta[ 0 ];

				}

			}

			function csc709Inverse( data ) {

				for ( let i = 0; i < 64; ++ i ) {

					const y = data[ 0 ][ i ];
					const cb = data[ 1 ][ i ];
					const cr = data[ 2 ][ i ];
					data[ 0 ][ i ] = y + 1.5747 * cr;
					data[ 1 ][ i ] = y - 0.1873 * cb - 0.4682 * cr;
					data[ 2 ][ i ] = y + 1.8556 * cb;

				}

			}

			function convertToHalf( src, dst, idx ) {

				for ( let i = 0; i < 64; ++ i ) {

					dst[ idx + i ] = THREE.DataUtils.toHalfFloat( toLinear( src[ i ] ) );

				}

			}

			function toLinear( float ) {

				if ( float <= 1 ) {

					return Math.sign( float ) * Math.pow( Math.abs( float ), 2.2 );

				} else {

					return Math.sign( float ) * Math.pow( logBase, Math.abs( float ) - 1.0 );

				}

			}

			function uncompressRAW( info ) {

				return new DataView( info.array.buffer, info.offset.value, info.size );

			}

			function uncompressRLE( info ) {

				const compressed = info.viewer.buffer.slice( info.offset.value, info.offset.value + info.size );
				const rawBuffer = new Uint8Array( decodeRunLength( compressed ) );
				const tmpBuffer = new Uint8Array( rawBuffer.length );
				predictor( rawBuffer ); // revert predictor

				interleaveScalar( rawBuffer, tmpBuffer ); // interleave pixels

				return new DataView( tmpBuffer.buffer );

			}

			function uncompressZIP( info ) {

				const compressed = info.array.slice( info.offset.value, info.offset.value + info.size );

				if ( typeof fflate === 'undefined' ) {

					console.error( 'THREE.EXRLoader: External library fflate.min.js required.' );

				}

				const rawBuffer = fflate.unzlibSync( compressed ); // eslint-disable-line no-undef

				const tmpBuffer = new Uint8Array( rawBuffer.length );
				predictor( rawBuffer ); // revert predictor

				interleaveScalar( rawBuffer, tmpBuffer ); // interleave pixels

				return new DataView( tmpBuffer.buffer );

			}

			function uncompressPIZ( info ) {

				const inDataView = info.viewer;
				const inOffset = {
					value: info.offset.value
				};
				const outBuffer = new Uint16Array( info.width * info.scanlineBlockSize * ( info.channels * info.type ) );
				const bitmap = new Uint8Array( BITMAP_SIZE ); // Setup channel info

				let outBufferEnd = 0;
				const pizChannelData = new Array( info.channels );

				for ( let i = 0; i < info.channels; i ++ ) {

					pizChannelData[ i ] = {};
					pizChannelData[ i ][ 'start' ] = outBufferEnd;
					pizChannelData[ i ][ 'end' ] = pizChannelData[ i ][ 'start' ];
					pizChannelData[ i ][ 'nx' ] = info.width;
					pizChannelData[ i ][ 'ny' ] = info.lines;
					pizChannelData[ i ][ 'size' ] = info.type;
					outBufferEnd += pizChannelData[ i ].nx * pizChannelData[ i ].ny * pizChannelData[ i ].size;

				} // Read range compression data


				const minNonZero = parseUint16( inDataView, inOffset );
				const maxNonZero = parseUint16( inDataView, inOffset );

				if ( maxNonZero >= BITMAP_SIZE ) {

					throw new Error( 'Something is wrong with PIZ_COMPRESSION BITMAP_SIZE' );

				}

				if ( minNonZero <= maxNonZero ) {

					for ( let i = 0; i < maxNonZero - minNonZero + 1; i ++ ) {

						bitmap[ i + minNonZero ] = parseUint8( inDataView, inOffset );

					}

				} // Reverse LUT


				const lut = new Uint16Array( USHORT_RANGE );
				const maxValue = reverseLutFromBitmap( bitmap, lut );
				const length = parseUint32( inDataView, inOffset ); // Huffman decoding

				hufUncompress( info.array, inDataView, inOffset, length, outBuffer, outBufferEnd ); // Wavelet decoding

				for ( let i = 0; i < info.channels; ++ i ) {

					const cd = pizChannelData[ i ];

					for ( let j = 0; j < pizChannelData[ i ].size; ++ j ) {

						wav2Decode( outBuffer, cd.start + j, cd.nx, cd.size, cd.ny, cd.nx * cd.size, maxValue );

					}

				} // Expand the pixel data to their original range


				applyLut( lut, outBuffer, outBufferEnd ); // Rearrange the pixel data into the format expected by the caller.

				let tmpOffset = 0;
				const tmpBuffer = new Uint8Array( outBuffer.buffer.byteLength );

				for ( let y = 0; y < info.lines; y ++ ) {

					for ( let c = 0; c < info.channels; c ++ ) {

						const cd = pizChannelData[ c ];
						const n = cd.nx * cd.size;
						const cp = new Uint8Array( outBuffer.buffer, cd.end * INT16_SIZE, n * INT16_SIZE );
						tmpBuffer.set( cp, tmpOffset );
						tmpOffset += n * INT16_SIZE;
						cd.end += n;

					}

				}

				return new DataView( tmpBuffer.buffer );

			}

			function uncompressPXR( info ) {

				const compressed = info.array.slice( info.offset.value, info.offset.value + info.size );

				if ( typeof fflate === 'undefined' ) {

					console.error( 'THREE.EXRLoader: External library fflate.min.js required.' );

				}

				const rawBuffer = fflate.unzlibSync( compressed ); // eslint-disable-line no-undef

				const sz = info.lines * info.channels * info.width;
				const tmpBuffer = info.type == 1 ? new Uint16Array( sz ) : new Uint32Array( sz );
				let tmpBufferEnd = 0;
				let writePtr = 0;
				const ptr = new Array( 4 );

				for ( let y = 0; y < info.lines; y ++ ) {

					for ( let c = 0; c < info.channels; c ++ ) {

						let pixel = 0;

						switch ( info.type ) {

							case 1:
								ptr[ 0 ] = tmpBufferEnd;
								ptr[ 1 ] = ptr[ 0 ] + info.width;
								tmpBufferEnd = ptr[ 1 ] + info.width;

								for ( let j = 0; j < info.width; ++ j ) {

									const diff = rawBuffer[ ptr[ 0 ] ++ ] << 8 | rawBuffer[ ptr[ 1 ] ++ ];
									pixel += diff;
									tmpBuffer[ writePtr ] = pixel;
									writePtr ++;

								}

								break;

							case 2:
								ptr[ 0 ] = tmpBufferEnd;
								ptr[ 1 ] = ptr[ 0 ] + info.width;
								ptr[ 2 ] = ptr[ 1 ] + info.width;
								tmpBufferEnd = ptr[ 2 ] + info.width;

								for ( let j = 0; j < info.width; ++ j ) {

									const diff = rawBuffer[ ptr[ 0 ] ++ ] << 24 | rawBuffer[ ptr[ 1 ] ++ ] << 16 | rawBuffer[ ptr[ 2 ] ++ ] << 8;
									pixel += diff;
									tmpBuffer[ writePtr ] = pixel;
									writePtr ++;

								}

								break;

						}

					}

				}

				return new DataView( tmpBuffer.buffer );

			}

			function uncompressDWA( info ) {

				const inDataView = info.viewer;
				const inOffset = {
					value: info.offset.value
				};
				const outBuffer = new Uint8Array( info.width * info.lines * ( info.channels * info.type * INT16_SIZE ) ); // Read compression header information

				const dwaHeader = {
					version: parseInt64( inDataView, inOffset ),
					unknownUncompressedSize: parseInt64( inDataView, inOffset ),
					unknownCompressedSize: parseInt64( inDataView, inOffset ),
					acCompressedSize: parseInt64( inDataView, inOffset ),
					dcCompressedSize: parseInt64( inDataView, inOffset ),
					rleCompressedSize: parseInt64( inDataView, inOffset ),
					rleUncompressedSize: parseInt64( inDataView, inOffset ),
					rleRawSize: parseInt64( inDataView, inOffset ),
					totalAcUncompressedCount: parseInt64( inDataView, inOffset ),
					totalDcUncompressedCount: parseInt64( inDataView, inOffset ),
					acCompression: parseInt64( inDataView, inOffset )
				};
				if ( dwaHeader.version < 2 ) throw new Error( 'EXRLoader.parse: ' + EXRHeader.compression + ' version ' + dwaHeader.version + ' is unsupported' ); // Read channel ruleset information

				const channelRules = new Array();
				let ruleSize = parseUint16( inDataView, inOffset ) - INT16_SIZE;

				while ( ruleSize > 0 ) {

					const name = parseNullTerminatedString( inDataView.buffer, inOffset );
					const value = parseUint8( inDataView, inOffset );
					const compression = value >> 2 & 3;
					const csc = ( value >> 4 ) - 1;
					const index = new Int8Array( [ csc ] )[ 0 ];
					const type = parseUint8( inDataView, inOffset );
					channelRules.push( {
						name: name,
						index: index,
						type: type,
						compression: compression
					} );
					ruleSize -= name.length + 3;

				} // Classify channels


				const channels = EXRHeader.channels;
				const channelData = new Array( info.channels );

				for ( let i = 0; i < info.channels; ++ i ) {

					const cd = channelData[ i ] = {};
					const channel = channels[ i ];
					cd.name = channel.name;
					cd.compression = UNKNOWN;
					cd.decoded = false;
					cd.type = channel.pixelType;
					cd.pLinear = channel.pLinear;
					cd.width = info.width;
					cd.height = info.lines;

				}

				const cscSet = {
					idx: new Array( 3 )
				};

				for ( let offset = 0; offset < info.channels; ++ offset ) {

					const cd = channelData[ offset ];

					for ( let i = 0; i < channelRules.length; ++ i ) {

						const rule = channelRules[ i ];

						if ( cd.name == rule.name ) {

							cd.compression = rule.compression;

							if ( rule.index >= 0 ) {

								cscSet.idx[ rule.index ] = offset;

							}

							cd.offset = offset;

						}

					}

				}

				let acBuffer, dcBuffer, rleBuffer; // Read DCT - AC component data

				if ( dwaHeader.acCompressedSize > 0 ) {

					switch ( dwaHeader.acCompression ) {

						case STATIC_HUFFMAN:
							acBuffer = new Uint16Array( dwaHeader.totalAcUncompressedCount );
							hufUncompress( info.array, inDataView, inOffset, dwaHeader.acCompressedSize, acBuffer, dwaHeader.totalAcUncompressedCount );
							break;

						case DEFLATE:
							const compressed = info.array.slice( inOffset.value, inOffset.value + dwaHeader.totalAcUncompressedCount );
							const data = fflate.unzlibSync( compressed ); // eslint-disable-line no-undef

							acBuffer = new Uint16Array( data.buffer );
							inOffset.value += dwaHeader.totalAcUncompressedCount;
							break;

					}

				} // Read DCT - DC component data


				if ( dwaHeader.dcCompressedSize > 0 ) {

					const zlibInfo = {
						array: info.array,
						offset: inOffset,
						size: dwaHeader.dcCompressedSize
					};
					dcBuffer = new Uint16Array( uncompressZIP( zlibInfo ).buffer );
					inOffset.value += dwaHeader.dcCompressedSize;

				} // Read RLE compressed data


				if ( dwaHeader.rleRawSize > 0 ) {

					const compressed = info.array.slice( inOffset.value, inOffset.value + dwaHeader.rleCompressedSize );
					const data = fflate.unzlibSync( compressed ); // eslint-disable-line no-undef

					rleBuffer = decodeRunLength( data.buffer );
					inOffset.value += dwaHeader.rleCompressedSize;

				} // Prepare outbuffer data offset


				let outBufferEnd = 0;
				const rowOffsets = new Array( channelData.length );

				for ( let i = 0; i < rowOffsets.length; ++ i ) {

					rowOffsets[ i ] = new Array();

				}

				for ( let y = 0; y < info.lines; ++ y ) {

					for ( let chan = 0; chan < channelData.length; ++ chan ) {

						rowOffsets[ chan ].push( outBufferEnd );
						outBufferEnd += channelData[ chan ].width * info.type * INT16_SIZE;

					}

				} // Lossy DCT decode RGB channels


				lossyDctDecode( cscSet, rowOffsets, channelData, acBuffer, dcBuffer, outBuffer ); // Decode other channels

				for ( let i = 0; i < channelData.length; ++ i ) {

					const cd = channelData[ i ];
					if ( cd.decoded ) continue;

					switch ( cd.compression ) {

						case RLE:
							let row = 0;
							let rleOffset = 0;

							for ( let y = 0; y < info.lines; ++ y ) {

								let rowOffsetBytes = rowOffsets[ i ][ row ];

								for ( let x = 0; x < cd.width; ++ x ) {

									for ( let byte = 0; byte < INT16_SIZE * cd.type; ++ byte ) {

										outBuffer[ rowOffsetBytes ++ ] = rleBuffer[ rleOffset + byte * cd.width * cd.height ];

									}

									rleOffset ++;

								}

								row ++;

							}

							break;

						case LOSSY_DCT: // skip

						default:
							throw new Error( 'EXRLoader.parse: unsupported channel compression' );

					}

				}

				return new DataView( outBuffer.buffer );

			}

			function parseNullTerminatedString( buffer, offset ) {

				const uintBuffer = new Uint8Array( buffer );
				let endOffset = 0;

				while ( uintBuffer[ offset.value + endOffset ] != 0 ) {

					endOffset += 1;

				}

				const stringValue = new TextDecoder().decode( uintBuffer.slice( offset.value, offset.value + endOffset ) );
				offset.value = offset.value + endOffset + 1;
				return stringValue;

			}

			function parseFixedLengthString( buffer, offset, size ) {

				const stringValue = new TextDecoder().decode( new Uint8Array( buffer ).slice( offset.value, offset.value + size ) );
				offset.value = offset.value + size;
				return stringValue;

			}

			function parseRational( dataView, offset ) {

				const x = parseInt32( dataView, offset );
				const y = parseUint32( dataView, offset );
				return [ x, y ];

			}

			function parseTimecode( dataView, offset ) {

				const x = parseUint32( dataView, offset );
				const y = parseUint32( dataView, offset );
				return [ x, y ];

			}

			function parseInt32( dataView, offset ) {

				const Int32 = dataView.getInt32( offset.value, true );
				offset.value = offset.value + INT32_SIZE;
				return Int32;

			}

			function parseUint32( dataView, offset ) {

				const Uint32 = dataView.getUint32( offset.value, true );
				offset.value = offset.value + INT32_SIZE;
				return Uint32;

			}

			function parseUint8Array( uInt8Array, offset ) {

				const Uint8 = uInt8Array[ offset.value ];
				offset.value = offset.value + INT8_SIZE;
				return Uint8;

			}

			function parseUint8( dataView, offset ) {

				const Uint8 = dataView.getUint8( offset.value );
				offset.value = offset.value + INT8_SIZE;
				return Uint8;

			}

			const parseInt64 = function ( dataView, offset ) {

				const Int64 = Number( dataView.getBigInt64( offset.value, true ) );
				offset.value += ULONG_SIZE;
				return Int64;

			};

			function parseFloat32( dataView, offset ) {

				const float = dataView.getFloat32( offset.value, true );
				offset.value += FLOAT32_SIZE;
				return float;

			}

			function decodeFloat32( dataView, offset ) {

				return THREE.DataUtils.toHalfFloat( parseFloat32( dataView, offset ) );

			} // https://stackoverflow.com/questions/5678432/decompressing-half-precision-floats-in-javascript


			function decodeFloat16( binary ) {

				const exponent = ( binary & 0x7C00 ) >> 10,
					fraction = binary & 0x03FF;
				return ( binary >> 15 ? - 1 : 1 ) * ( exponent ? exponent === 0x1F ? fraction ? NaN : Infinity : Math.pow( 2, exponent - 15 ) * ( 1 + fraction / 0x400 ) : 6.103515625e-5 * ( fraction / 0x400 ) );

			}

			function parseUint16( dataView, offset ) {

				const Uint16 = dataView.getUint16( offset.value, true );
				offset.value += INT16_SIZE;
				return Uint16;

			}

			function parseFloat16( buffer, offset ) {

				return decodeFloat16( parseUint16( buffer, offset ) );

			}

			function parseChlist( dataView, buffer, offset, size ) {

				const startOffset = offset.value;
				const channels = [];

				while ( offset.value < startOffset + size - 1 ) {

					const name = parseNullTerminatedString( buffer, offset );
					const pixelType = parseInt32( dataView, offset );
					const pLinear = parseUint8( dataView, offset );
					offset.value += 3; // reserved, three chars

					const xSampling = parseInt32( dataView, offset );
					const ySampling = parseInt32( dataView, offset );
					channels.push( {
						name: name,
						pixelType: pixelType,
						pLinear: pLinear,
						xSampling: xSampling,
						ySampling: ySampling
					} );

				}

				offset.value += 1;
				return channels;

			}

			function parseChromaticities( dataView, offset ) {

				const redX = parseFloat32( dataView, offset );
				const redY = parseFloat32( dataView, offset );
				const greenX = parseFloat32( dataView, offset );
				const greenY = parseFloat32( dataView, offset );
				const blueX = parseFloat32( dataView, offset );
				const blueY = parseFloat32( dataView, offset );
				const whiteX = parseFloat32( dataView, offset );
				const whiteY = parseFloat32( dataView, offset );
				return {
					redX: redX,
					redY: redY,
					greenX: greenX,
					greenY: greenY,
					blueX: blueX,
					blueY: blueY,
					whiteX: whiteX,
					whiteY: whiteY
				};

			}

			function parseCompression( dataView, offset ) {

				const compressionCodes = [ 'NO_COMPRESSION', 'RLE_COMPRESSION', 'ZIPS_COMPRESSION', 'ZIP_COMPRESSION', 'PIZ_COMPRESSION', 'PXR24_COMPRESSION', 'B44_COMPRESSION', 'B44A_COMPRESSION', 'DWAA_COMPRESSION', 'DWAB_COMPRESSION' ];
				const compression = parseUint8( dataView, offset );
				return compressionCodes[ compression ];

			}

			function parseBox2i( dataView, offset ) {

				const xMin = parseUint32( dataView, offset );
				const yMin = parseUint32( dataView, offset );
				const xMax = parseUint32( dataView, offset );
				const yMax = parseUint32( dataView, offset );
				return {
					xMin: xMin,
					yMin: yMin,
					xMax: xMax,
					yMax: yMax
				};

			}

			function parseLineOrder( dataView, offset ) {

				const lineOrders = [ 'INCREASING_Y' ];
				const lineOrder = parseUint8( dataView, offset );
				return lineOrders[ lineOrder ];

			}

			function parseV2f( dataView, offset ) {

				const x = parseFloat32( dataView, offset );
				const y = parseFloat32( dataView, offset );
				return [ x, y ];

			}

			function parseV3f( dataView, offset ) {

				const x = parseFloat32( dataView, offset );
				const y = parseFloat32( dataView, offset );
				const z = parseFloat32( dataView, offset );
				return [ x, y, z ];

			}

			function parseValue( dataView, buffer, offset, type, size ) {

				if ( type === 'string' || type === 'stringvector' || type === 'iccProfile' ) {

					return parseFixedLengthString( buffer, offset, size );

				} else if ( type === 'chlist' ) {

					return parseChlist( dataView, buffer, offset, size );

				} else if ( type === 'chromaticities' ) {

					return parseChromaticities( dataView, offset );

				} else if ( type === 'compression' ) {

					return parseCompression( dataView, offset );

				} else if ( type === 'box2i' ) {

					return parseBox2i( dataView, offset );

				} else if ( type === 'lineOrder' ) {

					return parseLineOrder( dataView, offset );

				} else if ( type === 'float' ) {

					return parseFloat32( dataView, offset );

				} else if ( type === 'v2f' ) {

					return parseV2f( dataView, offset );

				} else if ( type === 'v3f' ) {

					return parseV3f( dataView, offset );

				} else if ( type === 'int' ) {

					return parseInt32( dataView, offset );

				} else if ( type === 'rational' ) {

					return parseRational( dataView, offset );

				} else if ( type === 'timecode' ) {

					return parseTimecode( dataView, offset );

				} else if ( type === 'preview' ) {

					offset.value += size;
					return 'skipped';

				} else {

					offset.value += size;
					return undefined;

				}

			}

			function parseHeader( dataView, buffer, offset ) {

				const EXRHeader = {};

				if ( dataView.getUint32( 0, true ) != 20000630 ) {

					// magic
					throw new Error( 'THREE.EXRLoader: provided file doesn\'t appear to be in OpenEXR format.' );

				}

				EXRHeader.version = dataView.getUint8( 4 );
				const spec = dataView.getUint8( 5 ); // fullMask

				EXRHeader.spec = {
					singleTile: !! ( spec & 2 ),
					longName: !! ( spec & 4 ),
					deepFormat: !! ( spec & 8 ),
					multiPart: !! ( spec & 16 )
				}; // start of header

				offset.value = 8; // start at 8 - after pre-amble

				let keepReading = true;

				while ( keepReading ) {

					const attributeName = parseNullTerminatedString( buffer, offset );

					if ( attributeName == 0 ) {

						keepReading = false;

					} else {

						const attributeType = parseNullTerminatedString( buffer, offset );
						const attributeSize = parseUint32( dataView, offset );
						const attributeValue = parseValue( dataView, buffer, offset, attributeType, attributeSize );

						if ( attributeValue === undefined ) {

							console.warn( `EXRLoader.parse: skipped unknown header attribute type \'${attributeType}\'.` );

						} else {

							EXRHeader[ attributeName ] = attributeValue;

						}

					}

				}

				if ( ( spec & ~ 0x04 ) != 0 ) {

					// unsupported tiled, deep-image, multi-part
					console.error( 'EXRHeader:', EXRHeader );
					throw new Error( 'THREE.EXRLoader: provided file is currently unsupported.' );

				}

				return EXRHeader;

			}

			function setupDecoder( EXRHeader, dataView, uInt8Array, offset, outputType ) {

				const EXRDecoder = {
					size: 0,
					viewer: dataView,
					array: uInt8Array,
					offset: offset,
					width: EXRHeader.dataWindow.xMax - EXRHeader.dataWindow.xMin + 1,
					height: EXRHeader.dataWindow.yMax - EXRHeader.dataWindow.yMin + 1,
					channels: EXRHeader.channels.length,
					bytesPerLine: null,
					lines: null,
					inputSize: null,
					type: EXRHeader.channels[ 0 ].pixelType,
					uncompress: null,
					getter: null,
					format: null,
					encoding: null
				};

				switch ( EXRHeader.compression ) {

					case 'NO_COMPRESSION':
						EXRDecoder.lines = 1;
						EXRDecoder.uncompress = uncompressRAW;
						break;

					case 'RLE_COMPRESSION':
						EXRDecoder.lines = 1;
						EXRDecoder.uncompress = uncompressRLE;
						break;

					case 'ZIPS_COMPRESSION':
						EXRDecoder.lines = 1;
						EXRDecoder.uncompress = uncompressZIP;
						break;

					case 'ZIP_COMPRESSION':
						EXRDecoder.lines = 16;
						EXRDecoder.uncompress = uncompressZIP;
						break;

					case 'PIZ_COMPRESSION':
						EXRDecoder.lines = 32;
						EXRDecoder.uncompress = uncompressPIZ;
						break;

					case 'PXR24_COMPRESSION':
						EXRDecoder.lines = 16;
						EXRDecoder.uncompress = uncompressPXR;
						break;

					case 'DWAA_COMPRESSION':
						EXRDecoder.lines = 32;
						EXRDecoder.uncompress = uncompressDWA;
						break;

					case 'DWAB_COMPRESSION':
						EXRDecoder.lines = 256;
						EXRDecoder.uncompress = uncompressDWA;
						break;

					default:
						throw new Error( 'EXRLoader.parse: ' + EXRHeader.compression + ' is unsupported' );

				}

				EXRDecoder.scanlineBlockSize = EXRDecoder.lines;

				if ( EXRDecoder.type == 1 ) {

					// half
					switch ( outputType ) {

						case THREE.FloatType:
							EXRDecoder.getter = parseFloat16;
							EXRDecoder.inputSize = INT16_SIZE;
							break;

						case THREE.HalfFloatType:
							EXRDecoder.getter = parseUint16;
							EXRDecoder.inputSize = INT16_SIZE;
							break;

					}

				} else if ( EXRDecoder.type == 2 ) {

					// float
					switch ( outputType ) {

						case THREE.FloatType:
							EXRDecoder.getter = parseFloat32;
							EXRDecoder.inputSize = FLOAT32_SIZE;
							break;

						case THREE.HalfFloatType:
							EXRDecoder.getter = decodeFloat32;
							EXRDecoder.inputSize = FLOAT32_SIZE;

					}

				} else {

					throw new Error( 'EXRLoader.parse: unsupported pixelType ' + EXRDecoder.type + ' for ' + EXRHeader.compression + '.' );

				}

				EXRDecoder.blockCount = ( EXRHeader.dataWindow.yMax + 1 ) / EXRDecoder.scanlineBlockSize;

				for ( let i = 0; i < EXRDecoder.blockCount; i ++ ) parseInt64( dataView, offset ); // scanlineOffset
				// we should be passed the scanline offset table, ready to start reading pixel data.
				// RGB images will be converted to RGBA format, preventing software emulation in select devices.


				EXRDecoder.outputChannels = EXRDecoder.channels == 3 ? 4 : EXRDecoder.channels;
				const size = EXRDecoder.width * EXRDecoder.height * EXRDecoder.outputChannels;

				switch ( outputType ) {

					case THREE.FloatType:
						EXRDecoder.byteArray = new Float32Array( size ); // Fill initially with 1s for the alpha value if the texture is not RGBA, RGB values will be overwritten

						if ( EXRDecoder.channels < EXRDecoder.outputChannels ) EXRDecoder.byteArray.fill( 1, 0, size );
						break;

					case THREE.HalfFloatType:
						EXRDecoder.byteArray = new Uint16Array( size );
						if ( EXRDecoder.channels < EXRDecoder.outputChannels ) EXRDecoder.byteArray.fill( 0x3C00, 0, size ); // Uint16Array holds half float data, 0x3C00 is 1

						break;

					default:
						console.error( 'THREE.EXRLoader: unsupported type: ', outputType );
						break;

				}

				EXRDecoder.bytesPerLine = EXRDecoder.width * EXRDecoder.inputSize * EXRDecoder.channels;

				if ( EXRDecoder.outputChannels == 4 ) {

					EXRDecoder.format = THREE.RGBAFormat;
					EXRDecoder.encoding = THREE.LinearEncoding;

				} else {

					EXRDecoder.format = THREE.RedFormat;
					EXRDecoder.encoding = THREE.LinearEncoding;

				}

				return EXRDecoder;

			} // start parsing file [START]


			const bufferDataView = new DataView( buffer );
			const uInt8Array = new Uint8Array( buffer );
			const offset = {
				value: 0
			}; // get header information and validate format.

			const EXRHeader = parseHeader( bufferDataView, buffer, offset ); // get input compression information and prepare decoding.

			const EXRDecoder = setupDecoder( EXRHeader, bufferDataView, uInt8Array, offset, this.type );
			const tmpOffset = {
				value: 0
			};
			const channelOffsets = {
				R: 0,
				G: 1,
				B: 2,
				A: 3,
				Y: 0
			};

			for ( let scanlineBlockIdx = 0; scanlineBlockIdx < EXRDecoder.height / EXRDecoder.scanlineBlockSize; scanlineBlockIdx ++ ) {

				const line = parseUint32( bufferDataView, offset ); // line_no

				EXRDecoder.size = parseUint32( bufferDataView, offset ); // data_len

				EXRDecoder.lines = line + EXRDecoder.scanlineBlockSize > EXRDecoder.height ? EXRDecoder.height - line : EXRDecoder.scanlineBlockSize;
				const isCompressed = EXRDecoder.size < EXRDecoder.lines * EXRDecoder.bytesPerLine;
				const viewer = isCompressed ? EXRDecoder.uncompress( EXRDecoder ) : uncompressRAW( EXRDecoder );
				offset.value += EXRDecoder.size;

				for ( let line_y = 0; line_y < EXRDecoder.scanlineBlockSize; line_y ++ ) {

					const true_y = line_y + scanlineBlockIdx * EXRDecoder.scanlineBlockSize;
					if ( true_y >= EXRDecoder.height ) break;

					for ( let channelID = 0; channelID < EXRDecoder.channels; channelID ++ ) {

						const cOff = channelOffsets[ EXRHeader.channels[ channelID ].name ];

						for ( let x = 0; x < EXRDecoder.width; x ++ ) {

							tmpOffset.value = ( line_y * ( EXRDecoder.channels * EXRDecoder.width ) + channelID * EXRDecoder.width + x ) * EXRDecoder.inputSize;
							const outIndex = ( EXRDecoder.height - 1 - true_y ) * ( EXRDecoder.width * EXRDecoder.outputChannels ) + x * EXRDecoder.outputChannels + cOff;
							EXRDecoder.byteArray[ outIndex ] = EXRDecoder.getter( viewer, tmpOffset );

						}

					}

				}

			}

			return {
				header: EXRHeader,
				width: EXRDecoder.width,
				height: EXRDecoder.height,
				data: EXRDecoder.byteArray,
				format: EXRDecoder.format,
				encoding: EXRDecoder.encoding,
				type: this.type
			};

		}

		setDataType( value ) {

			this.type = value;
			return this;

		}

		load( url, onLoad, onProgress, onError ) {

			function onLoadCallback( texture, texData ) {

				texture.encoding = texData.encoding;
				texture.minFilter = THREE.LinearFilter;
				texture.magFilter = THREE.LinearFilter;
				texture.generateMipmaps = false;
				texture.flipY = false;
				if ( onLoad ) onLoad( texture, texData );

			}

			return super.load( url, onLoadCallback, onProgress, onError );

		}

	}

	THREE.EXRLoader = EXRLoader;

} )();