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{\n\tDataTextureLoader,\n\tDataUtils,\n\tFloatType,\n\tHalfFloatType,\n\tLinearFilter,\n\tLinearSRGBColorSpace\n} from 'three';\n\n// https://github.com/mrdoob/three.js/issues/5552\n// http://en.wikipedia.org/wiki/RGBE_image_format\n\nclass RGBELoader extends DataTextureLoader {\n\n\tconstructor( manager ) {\n\n\t\tsuper( manager );\n\n\t\tthis.type = HalfFloatType;\n\n\t}\n\n\t// adapted from http://www.graphics.cornell.edu/~bjw/rgbe.html\n\n\tparse( buffer ) {\n\n\t\tconst\n\t\t\t/* default error routine.  change this to change error handling */\n\t\t\trgbe_read_error = 1,\n\t\t\trgbe_write_error = 2,\n\t\t\trgbe_format_error = 3,\n\t\t\trgbe_memory_error = 4,\n\t\t\trgbe_error = function ( rgbe_error_code, msg ) {\n\n\t\t\t\tswitch ( rgbe_error_code ) {\n\n\t\t\t\t\tcase rgbe_read_error: throw new Error( 'THREE.RGBELoader: Read Error: ' + ( msg || '' ) );\n\t\t\t\t\tcase rgbe_write_error: throw new Error( 'THREE.RGBELoader: Write Error: ' + ( msg || '' ) );\n\t\t\t\t\tcase 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( match = line.match( magic_token_re ) ) ) {\n\n\t\t\t\t\trgbe_error( rgbe_format_error, 'bad initial token' );\n\n\t\t\t\t}\n\n\t\t\t\theader.valid |= RGBE_VALID_PROGRAMTYPE;\n\t\t\t\theader.programtype = match[ 1 ];\n\t\t\t\theader.string += line + '\\n';\n\n\t\t\t\twhile ( true ) {\n\n\t\t\t\t\tline = fgets( buffer );\n\t\t\t\t\tif ( false === line ) break;\n\t\t\t\t\theader.string += line + '\\n';\n\n\t\t\t\t\tif ( '#' === line.charAt( 0 ) ) {\n\n\t\t\t\t\t\theader.comments += line + '\\n';\n\t\t\t\t\t\tcontinue; // comment line\n\n\t\t\t\t\t}\n\n\t\t\t\t\tif ( match = line.match( gamma_re ) ) {\n\n\t\t\t\t\t\theader.gamma = parseFloat( match[ 1 ] );\n\n\t\t\t\t\t}\n\n\t\t\t\t\tif ( match = line.match( exposure_re ) ) {\n\n\t\t\t\t\t\theader.exposure = parseFloat( match[ 1 ] );\n\n\t\t\t\t\t}\n\n\t\t\t\t\tif ( match = line.match( format_re ) ) {\n\n\t\t\t\t\t\theader.valid |= RGBE_VALID_FORMAT;\n\t\t\t\t\t\theader.format = match[ 1 ];//'32-bit_rle_rgbe';\n\n\t\t\t\t\t}\n\n\t\t\t\t\tif ( match = line.match( dimensions_re ) ) {\n\n\t\t\t\t\t\theader.valid |= RGBE_VALID_DIMENSIONS;\n\t\t\t\t\t\theader.height = parseInt( match[ 1 ], 10 );\n\t\t\t\t\t\theader.width = parseInt( match[ 2 ], 10 );\n\n\t\t\t\t\t}\n\n\t\t\t\t\tif ( ( header.valid \u0026 RGBE_VALID_FORMAT ) \u0026\u0026 ( header.valid \u0026 RGBE_VALID_DIMENSIONS ) ) break;\n\n\t\t\t\t}\n\n\t\t\t\tif ( ! ( header.valid \u0026 RGBE_VALID_FORMAT ) ) {\n\n\t\t\t\t\trgbe_error( rgbe_format_error, 'missing format specifier' );\n\n\t\t\t\t}\n\n\t\t\t\tif ( ! ( header.valid \u0026 RGBE_VALID_DIMENSIONS ) ) {\n\n\t\t\t\t\trgbe_error( rgbe_format_error, 'missing image size specifier' );\n\n\t\t\t\t}\n\n\t\t\t\treturn header;\n\n\t\t\t},\n\n\t\t\tRGBE_ReadPixels_RLE = function ( buffer, w, h ) {\n\n\t\t\t\tconst scanline_width = w;\n\n\t\t\t\tif (\n\t\t\t\t\t// run length encoding is not allowed so read flat\n\t\t\t\t\t( ( scanline_width \u003c 8 ) || ( scanline_width \u003e 0x7fff ) ) ||\n\t\t\t\t\t// this file is not run length encoded\n\t\t\t\t\t( ( 2 !== buffer[ 0 ] ) || ( 2 !== buffer[ 1 ] ) || ( buffer[ 2 ] \u0026 0x80 ) )\n\t\t\t\t) {\n\n\t\t\t\t\t// return the flat buffer\n\t\t\t\t\treturn new Uint8Array( buffer );\n\n\t\t\t\t}\n\n\t\t\t\tif ( scanline_width !== ( ( buffer[ 2 ] \u003c\u003c 8 ) | buffer[ 3 ] ) ) {\n\n\t\t\t\t\trgbe_error( rgbe_format_error, 'wrong scanline width' );\n\n\t\t\t\t}\n\n\t\t\t\tconst data_rgba = new Uint8Array( 4 * w * h );\n\n\t\t\t\tif ( ! data_rgba.length ) {\n\n\t\t\t\t\trgbe_error( rgbe_memory_error, 'unable to allocate buffer space' );\n\n\t\t\t\t}\n\n\t\t\t\tlet offset = 0, pos = 0;\n\n\t\t\t\tconst ptr_end = 4 * scanline_width;\n\t\t\t\tconst rgbeStart = new Uint8Array( 4 );\n\t\t\t\tconst scanline_buffer = new Uint8Array( ptr_end );\n\t\t\t\tlet num_scanlines = h;\n\n\t\t\t\t// read in each successive scanline\n\t\t\t\twhile ( ( num_scanlines \u003e 0 ) \u0026\u0026 ( pos \u003c buffer.byteLength ) ) {\n\n\t\t\t\t\tif ( pos + 4 \u003e buffer.byteLength ) {\n\n\t\t\t\t\t\trgbe_error( rgbe_read_error );\n\n\t\t\t\t\t}\n\n\t\t\t\t\trgbeStart[ 0 ] = buffer[ pos ++ ];\n\t\t\t\t\trgbeStart[ 1 ] = buffer[ pos ++ ];\n\t\t\t\t\trgbeStart[ 2 ] = buffer[ pos ++ ];\n\t\t\t\t\trgbeStart[ 3 ] = buffer[ pos ++ ];\n\n\t\t\t\t\tif ( ( 2 != rgbeStart[ 0 ] ) || ( 2 != rgbeStart[ 1 ] ) || ( ( ( rgbeStart[ 2 ] \u003c\u003c 8 ) | rgbeStart[ 3 ] ) != scanline_width ) ) {\n\n\t\t\t\t\t\trgbe_error( rgbe_format_error, 'bad rgbe scanline format' );\n\n\t\t\t\t\t}\n\n\t\t\t\t\t// read each of the four channels for the scanline into the buffer\n\t\t\t\t\t// first red, then green, then blue, then exponent\n\t\t\t\t\tlet ptr = 0, count;\n\n\t\t\t\t\twhile ( ( ptr \u003c ptr_end ) \u0026\u0026 ( pos \u003c buffer.byteLength ) ) {\n\n\t\t\t\t\t\tcount = buffer[ pos ++ ];\n\t\t\t\t\t\tconst isEncodedRun = count \u003e 128;\n\t\t\t\t\t\tif ( isEncodedRun ) count -= 128;\n\n\t\t\t\t\t\tif ( ( 0 === count ) || ( ptr + count \u003e ptr_end ) ) {\n\n\t\t\t\t\t\t\trgbe_error( rgbe_format_error, 'bad scanline data' );\n\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tif ( isEncodedRun ) {\n\n\t\t\t\t\t\t\t// a (encoded) run of the same value\n\t\t\t\t\t\t\tconst byteValue = buffer[ pos ++ ];\n\t\t\t\t\t\t\tfor ( let i = 0; i \u003c count; i ++ ) {\n\n\t\t\t\t\t\t\t\tscanline_buffer[ ptr ++ ] = byteValue;\n\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t//ptr += count;\n\n\t\t\t\t\t\t} else {\n\n\t\t\t\t\t\t\t// a literal-run\n\t\t\t\t\t\t\tscanline_buffer.set( buffer.subarray( pos, pos + count ), ptr );\n\t\t\t\t\t\t\tptr += count; pos += count;\n\n\t\t\t\t\t\t}\n\n\t\t\t\t\t}\n\n\n\t\t\t\t\t// now convert data from buffer into rgba\n\t\t\t\t\t// first red, then green, then blue, then exponent (alpha)\n\t\t\t\t\tconst l = scanline_width; //scanline_buffer.byteLength;\n\t\t\t\t\tfor ( let i = 0; i \u003c l; i ++ ) {\n\n\t\t\t\t\t\tlet off = 0;\n\t\t\t\t\t\tdata_rgba[ offset ] = scanline_buffer[ i + off ];\n\t\t\t\t\t\toff += scanline_width; //1;\n\t\t\t\t\t\tdata_rgba[ offset + 1 ] = scanline_buffer[ i + off ];\n\t\t\t\t\t\toff += scanline_width; //1;\n\t\t\t\t\t\tdata_rgba[ offset + 2 ] = scanline_buffer[ i + off ];\n\t\t\t\t\t\toff += scanline_width; //1;\n\t\t\t\t\t\tdata_rgba[ offset + 3 ] = scanline_buffer[ i + off ];\n\t\t\t\t\t\toffset += 4;\n\n\t\t\t\t\t}\n\n\t\t\t\t\tnum_scanlines --;\n\n\t\t\t\t}\n\n\t\t\t\treturn data_rgba;\n\n\t\t\t};\n\n\t\tconst RGBEByteToRGBFloat = function ( sourceArray, sourceOffset, destArray, destOffset ) {\n\n\t\t\tconst e = sourceArray[ sourceOffset + 3 ];\n\t\t\tconst scale = Math.pow( 2.0, e - 128.0 ) / 255.0;\n\n\t\t\tdestArray[ destOffset + 0 ] = sourceArray[ sourceOffset + 0 ] * scale;\n\t\t\tdestArray[ destOffset + 1 ] = sourceArray[ sourceOffset + 1 ] * scale;\n\t\t\tdestArray[ destOffset + 2 ] = sourceArray[ sourceOffset + 2 ] * scale;\n\t\t\tdestArray[ destOffset + 3 ] = 1;\n\n\t\t};\n\n\t\tconst RGBEByteToRGBHalf = function ( sourceArray, sourceOffset, destArray, destOffset ) {\n\n\t\t\tconst e = sourceArray[ sourceOffset + 3 ];\n\t\t\tconst scale = Math.pow( 2.0, e - 128.0 ) / 255.0;\n\n\t\t\t// clamping to 65504, the maximum representable value in float16\n\t\t\tdestArray[ destOffset + 0 ] = DataUtils.toHalfFloat( Math.min( sourceArray[ sourceOffset + 0 ] * scale, 65504 ) );\n\t\t\tdestArray[ destOffset + 1 ] = DataUtils.toHalfFloat( Math.min( sourceArray[ sourceOffset + 1 ] * scale, 65504 ) );\n\t\t\tdestArray[ destOffset + 2 ] = DataUtils.toHalfFloat( Math.min( sourceArray[ sourceOffset + 2 ] * scale, 65504 ) );\n\t\t\tdestArray[ destOffset + 3 ] = DataUtils.toHalfFloat( 1 );\n\n\t\t};\n\n\t\tconst byteArray = new Uint8Array( buffer );\n\t\tbyteArray.pos = 0;\n\t\tconst rgbe_header_info = RGBE_ReadHeader( byteArray );\n\n\t\tconst w = rgbe_header_info.width,\n\t\t\th = rgbe_header_info.height,\n\t\t\timage_rgba_data = RGBE_ReadPixels_RLE( byteArray.subarray( byteArray.pos ), w, h );\n\n\n\t\tlet data, type;\n\t\tlet numElements;\n\n\t\tswitch ( this.type ) {\n\n\t\t\tcase FloatType:\n\n\t\t\t\tnumElements = image_rgba_data.length / 4;\n\t\t\t\tconst floatArray = new Float32Array( numElements * 4 );\n\n\t\t\t\tfor ( let j = 0; j \u003c numElements; j ++ ) {\n\n\t\t\t\t\tRGBEByteToRGBFloat( image_rgba_data, j * 4, floatArray, j * 4 );\n\n\t\t\t\t}\n\n\t\t\t\tdata = floatArray;\n\t\t\t\ttype = FloatType;\n\t\t\t\tbreak;\n\n\t\t\tcase HalfFloatType:\n\n\t\t\t\tnumElements = image_rgba_data.length / 4;\n\t\t\t\tconst halfArray = new Uint16Array( numElements * 4 );\n\n\t\t\t\tfor ( let j = 0; j \u003c numElements; j ++ ) {\n\n\t\t\t\t\tRGBEByteToRGBHalf( image_rgba_data, j * 4, halfArray, j * 4 );\n\n\t\t\t\t}\n\n\t\t\t\tdata = halfArray;\n\t\t\t\ttype = HalfFloatType;\n\t\t\t\tbreak;\n\n\t\t\tdefault:\n\n\t\t\t\tthrow new Error( 'THREE.RGBELoader: Unsupported type: ' + this.type );\n\t\t\t\tbreak;\n\n\t\t}\n\n\t\treturn {\n\t\t\twidth: w, height: h,\n\t\t\tdata: data,\n\t\t\theader: rgbe_header_info.string,\n\t\t\tgamma: rgbe_header_info.gamma,\n\t\t\texposure: rgbe_header_info.exposure,\n\t\t\ttype: type\n\t\t};\n\n\t}\n\n\tsetDataType( value ) {\n\n\t\tthis.type = value;\n\t\treturn this;\n\n\t}\n\n\tload( url, onLoad, onProgress, onError ) {\n\n\t\tfunction onLoadCallback( texture, texData ) {\n\n\t\t\tswitch ( texture.type ) {\n\n\t\t\t\tcase FloatType:\n\t\t\t\tcase HalfFloatType:\n\n\t\t\t\t\ttexture.colorSpace = LinearSRGBColorSpace;\n\t\t\t\t\ttexture.minFilter = LinearFilter;\n\t\t\t\t\ttexture.magFilter = LinearFilter;\n\t\t\t\t\ttexture.generateMipmaps = false;\n\t\t\t\t\ttexture.flipY = true;\n\n\t\t\t\t\tbreak;\n\n\t\t\t}\n\n\t\t\tif ( onLoad ) onLoad( texture, texData );\n\n\t\t}\n\n\t\treturn super.load( url, onLoadCallback, onProgress, onError );\n\n\t}\n\n}\n\nexport { RGBELoader };\n"],"version":3}