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