( function () {
// http://en.wikipedia.org/wiki/RGBE_image_format
class RGBELoader extends THREE.DataTextureLoader {
constructor( manager ) {
super( manager );
this.type = THREE.HalfFloatType;
} // adapted from http://www.graphics.cornell.edu/~bjw/rgbe.html
parse( buffer ) {
const
/* return codes for rgbe routines */
//RGBE_RETURN_SUCCESS = 0,
RGBE_RETURN_FAILURE = - 1,
/* default error routine. change this to change error handling */
rgbe_read_error = 1,
rgbe_write_error = 2,
rgbe_format_error = 3,
rgbe_memory_error = 4,
rgbe_error = function ( rgbe_error_code, msg ) {
switch ( rgbe_error_code ) {
case rgbe_read_error:
console.error( 'THREE.RGBELoader Read Error: ' + ( msg || '' ) );
break;
case rgbe_write_error:
console.error( 'THREE.RGBELoader Write Error: ' + ( msg || '' ) );
break;
case rgbe_format_error:
console.error( 'THREE.RGBELoader Bad File Format: ' + ( msg || '' ) );
break;
default:
case rgbe_memory_error:
console.error( 'THREE.RGBELoader: Error: ' + ( msg || '' ) );
}
return RGBE_RETURN_FAILURE;
},
/* offsets to red, green, and blue components in a data (float) pixel */
//RGBE_DATA_RED = 0,
//RGBE_DATA_GREEN = 1,
//RGBE_DATA_BLUE = 2,
/* number of floats per pixel, use 4 since stored in rgba image format */
//RGBE_DATA_SIZE = 4,
/* flags indicating which fields in an rgbe_header_info are valid */
RGBE_VALID_PROGRAMTYPE = 1,
RGBE_VALID_FORMAT = 2,
RGBE_VALID_DIMENSIONS = 4,
NEWLINE = '\n',
fgets = function ( buffer, lineLimit, consume ) {
const chunkSize = 128;
lineLimit = ! lineLimit ? 1024 : lineLimit;
let p = buffer.pos,
i = - 1,
len = 0,
s = '',
chunk = String.fromCharCode.apply( null, new Uint16Array( buffer.subarray( p, p + chunkSize ) ) );
while ( 0 > ( i = chunk.indexOf( NEWLINE ) ) && len < lineLimit && p < buffer.byteLength ) {
s += chunk;
len += chunk.length;
p += chunkSize;
chunk += String.fromCharCode.apply( null, new Uint16Array( buffer.subarray( p, p + chunkSize ) ) );
}
if ( - 1 < i ) {
/*for (i=l-1; i>=0; i--) {
byteCode = m.charCodeAt(i);
if (byteCode > 0x7f && byteCode <= 0x7ff) byteLen++;
else if (byteCode > 0x7ff && byteCode <= 0xffff) byteLen += 2;
if (byteCode >= 0xDC00 && byteCode <= 0xDFFF) i--; //trail surrogate
}*/
if ( false !== consume ) buffer.pos += len + i + 1;
return s + chunk.slice( 0, i );
}
return false;
},
/* minimal header reading. modify if you want to parse more information */
RGBE_ReadHeader = function ( buffer ) {
// regexes to parse header info fields
const magic_token_re = /^#\?(\S+)/,
gamma_re = /^\s*GAMMA\s*=\s*(\d+(\.\d+)?)\s*$/,
exposure_re = /^\s*EXPOSURE\s*=\s*(\d+(\.\d+)?)\s*$/,
format_re = /^\s*FORMAT=(\S+)\s*$/,
dimensions_re = /^\s*\-Y\s+(\d+)\s+\+X\s+(\d+)\s*$/,
// RGBE format header struct
header = {
valid: 0,
/* indicate which fields are valid */
string: '',
/* the actual header string */
comments: '',
/* comments found in header */
programtype: 'RGBE',
/* listed at beginning of file to identify it after "#?". defaults to "RGBE" */
format: '',
/* RGBE format, default 32-bit_rle_rgbe */
gamma: 1.0,
/* image has already been gamma corrected with given gamma. defaults to 1.0 (no correction) */
exposure: 1.0,
/* a value of 1.0 in an image corresponds to <exposure> watts/steradian/m^2. defaults to 1.0 */
width: 0,
height: 0
/* image dimensions, width/height */
};
let line, match;
if ( buffer.pos >= buffer.byteLength || ! ( line = fgets( buffer ) ) ) {
return rgbe_error( rgbe_read_error, 'no header found' );
}
/* if you want to require the magic token then uncomment the next line */
if ( ! ( match = line.match( magic_token_re ) ) ) {
return rgbe_error( rgbe_format_error, 'bad initial token' );
}
header.valid |= RGBE_VALID_PROGRAMTYPE;
header.programtype = match[ 1 ];
header.string += line + '\n';
while ( true ) {
line = fgets( buffer );
if ( false === line ) break;
header.string += line + '\n';
if ( '#' === line.charAt( 0 ) ) {
header.comments += line + '\n';
continue; // comment line
}
if ( match = line.match( gamma_re ) ) {
header.gamma = parseFloat( match[ 1 ] );
}
if ( match = line.match( exposure_re ) ) {
header.exposure = parseFloat( match[ 1 ] );
}
if ( match = line.match( format_re ) ) {
header.valid |= RGBE_VALID_FORMAT;
header.format = match[ 1 ]; //'32-bit_rle_rgbe';
}
if ( match = line.match( dimensions_re ) ) {
header.valid |= RGBE_VALID_DIMENSIONS;
header.height = parseInt( match[ 1 ], 10 );
header.width = parseInt( match[ 2 ], 10 );
}
if ( header.valid & RGBE_VALID_FORMAT && header.valid & RGBE_VALID_DIMENSIONS ) break;
}
if ( ! ( header.valid & RGBE_VALID_FORMAT ) ) {
return rgbe_error( rgbe_format_error, 'missing format specifier' );
}
if ( ! ( header.valid & RGBE_VALID_DIMENSIONS ) ) {
return rgbe_error( rgbe_format_error, 'missing image size specifier' );
}
return header;
},
RGBE_ReadPixels_RLE = function ( buffer, w, h ) {
const scanline_width = w;
if ( // run length encoding is not allowed so read flat
scanline_width < 8 || scanline_width > 0x7fff || // this file is not run length encoded
2 !== buffer[ 0 ] || 2 !== buffer[ 1 ] || buffer[ 2 ] & 0x80 ) {
// return the flat buffer
return new Uint8Array( buffer );
}
if ( scanline_width !== ( buffer[ 2 ] << 8 | buffer[ 3 ] ) ) {
return rgbe_error( rgbe_format_error, 'wrong scanline width' );
}
const data_rgba = new Uint8Array( 4 * w * h );
if ( ! data_rgba.length ) {
return rgbe_error( rgbe_memory_error, 'unable to allocate buffer space' );
}
let offset = 0,
pos = 0;
const ptr_end = 4 * scanline_width;
const rgbeStart = new Uint8Array( 4 );
const scanline_buffer = new Uint8Array( ptr_end );
let num_scanlines = h; // read in each successive scanline
while ( num_scanlines > 0 && pos < buffer.byteLength ) {
if ( pos + 4 > buffer.byteLength ) {
return rgbe_error( rgbe_read_error );
}
rgbeStart[ 0 ] = buffer[ pos ++ ];
rgbeStart[ 1 ] = buffer[ pos ++ ];
rgbeStart[ 2 ] = buffer[ pos ++ ];
rgbeStart[ 3 ] = buffer[ pos ++ ];
if ( 2 != rgbeStart[ 0 ] || 2 != rgbeStart[ 1 ] || ( rgbeStart[ 2 ] << 8 | rgbeStart[ 3 ] ) != scanline_width ) {
return rgbe_error( rgbe_format_error, 'bad rgbe scanline format' );
} // read each of the four channels for the scanline into the buffer
// first red, then green, then blue, then exponent
let ptr = 0,
count;
while ( ptr < ptr_end && pos < buffer.byteLength ) {
count = buffer[ pos ++ ];
const isEncodedRun = count > 128;
if ( isEncodedRun ) count -= 128;
if ( 0 === count || ptr + count > ptr_end ) {
return rgbe_error( rgbe_format_error, 'bad scanline data' );
}
if ( isEncodedRun ) {
// a (encoded) run of the same value
const byteValue = buffer[ pos ++ ];
for ( let i = 0; i < count; i ++ ) {
scanline_buffer[ ptr ++ ] = byteValue;
} //ptr += count;
} else {
// a literal-run
scanline_buffer.set( buffer.subarray( pos, pos + count ), ptr );
ptr += count;
pos += count;
}
} // now convert data from buffer into rgba
// first red, then green, then blue, then exponent (alpha)
const l = scanline_width; //scanline_buffer.byteLength;
for ( let i = 0; i < l; i ++ ) {
let off = 0;
data_rgba[ offset ] = scanline_buffer[ i + off ];
off += scanline_width; //1;
data_rgba[ offset + 1 ] = scanline_buffer[ i + off ];
off += scanline_width; //1;
data_rgba[ offset + 2 ] = scanline_buffer[ i + off ];
off += scanline_width; //1;
data_rgba[ offset + 3 ] = scanline_buffer[ i + off ];
offset += 4;
}
num_scanlines --;
}
return data_rgba;
};
const RGBEByteToRGBFloat = function ( sourceArray, sourceOffset, destArray, destOffset ) {
const e = sourceArray[ sourceOffset + 3 ];
const scale = Math.pow( 2.0, e - 128.0 ) / 255.0;
destArray[ destOffset + 0 ] = sourceArray[ sourceOffset + 0 ] * scale;
destArray[ destOffset + 1 ] = sourceArray[ sourceOffset + 1 ] * scale;
destArray[ destOffset + 2 ] = sourceArray[ sourceOffset + 2 ] * scale;
destArray[ destOffset + 3 ] = 1;
};
const RGBEByteToRGBHalf = function ( sourceArray, sourceOffset, destArray, destOffset ) {
const e = sourceArray[ sourceOffset + 3 ];
const scale = Math.pow( 2.0, e - 128.0 ) / 255.0; // clamping to 65504, the maximum representable value in float16
destArray[ destOffset + 0 ] = THREE.DataUtils.toHalfFloat( Math.min( sourceArray[ sourceOffset + 0 ] * scale, 65504 ) );
destArray[ destOffset + 1 ] = THREE.DataUtils.toHalfFloat( Math.min( sourceArray[ sourceOffset + 1 ] * scale, 65504 ) );
destArray[ destOffset + 2 ] = THREE.DataUtils.toHalfFloat( Math.min( sourceArray[ sourceOffset + 2 ] * scale, 65504 ) );
destArray[ destOffset + 3 ] = THREE.DataUtils.toHalfFloat( 1 );
};
const byteArray = new Uint8Array( buffer );
byteArray.pos = 0;
const rgbe_header_info = RGBE_ReadHeader( byteArray );
if ( RGBE_RETURN_FAILURE !== rgbe_header_info ) {
const w = rgbe_header_info.width,
h = rgbe_header_info.height,
image_rgba_data = RGBE_ReadPixels_RLE( byteArray.subarray( byteArray.pos ), w, h );
if ( RGBE_RETURN_FAILURE !== image_rgba_data ) {
let data, type;
let numElements;
switch ( this.type ) {
case THREE.FloatType:
numElements = image_rgba_data.length / 4;
const floatArray = new Float32Array( numElements * 4 );
for ( let j = 0; j < numElements; j ++ ) {
RGBEByteToRGBFloat( image_rgba_data, j * 4, floatArray, j * 4 );
}
data = floatArray;
type = THREE.FloatType;
break;
case THREE.HalfFloatType:
numElements = image_rgba_data.length / 4;
const halfArray = new Uint16Array( numElements * 4 );
for ( let j = 0; j < numElements; j ++ ) {
RGBEByteToRGBHalf( image_rgba_data, j * 4, halfArray, j * 4 );
}
data = halfArray;
type = THREE.HalfFloatType;
break;
default:
console.error( 'THREE.RGBELoader: unsupported type: ', this.type );
break;
}
return {
width: w,
height: h,
data: data,
header: rgbe_header_info.string,
gamma: rgbe_header_info.gamma,
exposure: rgbe_header_info.exposure,
type: type
};
}
}
return null;
}
setDataType( value ) {
this.type = value;
return this;
}
load( url, onLoad, onProgress, onError ) {
function onLoadCallback( texture, texData ) {
switch ( texture.type ) {
case THREE.FloatType:
case THREE.HalfFloatType:
texture.encoding = THREE.LinearEncoding;
texture.minFilter = THREE.LinearFilter;
texture.magFilter = THREE.LinearFilter;
texture.generateMipmaps = false;
texture.flipY = true;
break;
}
if ( onLoad ) onLoad( texture, texData );
}
return super.load( url, onLoadCallback, onProgress, onError );
}
}
THREE.RGBELoader = RGBELoader;
} )();
