( function () {
/**
* @author sciecode / https://github.com/sciecode
*
* EXR format references:
* https://www.openexr.com/documentation/openexrfilelayout.pdf
*/
const textEncoder = new TextEncoder();
const NO_COMPRESSION = 0;
const ZIPS_COMPRESSION = 2;
const ZIP_COMPRESSION = 3;
class EXRExporter {
parse( renderer, renderTarget, options ) {
if ( ! supported( renderer, renderTarget ) ) return undefined;
const info = buildInfo( renderTarget, options ),
dataBuffer = getPixelData( renderer, renderTarget, info ),
rawContentBuffer = reorganizeDataBuffer( dataBuffer, info ),
chunks = compressData( rawContentBuffer, info );
return fillData( chunks, info );
}
}
function supported( renderer, renderTarget ) {
if ( ! renderer || ! renderer.isWebGLRenderer ) {
console.error( 'EXRExporter.parse: Unsupported first parameter, expected instance of WebGLRenderer.' );
return false;
}
if ( ! renderTarget || ! renderTarget.isWebGLRenderTarget ) {
console.error( 'EXRExporter.parse: Unsupported second parameter, expected instance of WebGLRenderTarget.' );
return false;
}
if ( renderTarget.texture.type !== THREE.FloatType && renderTarget.texture.type !== THREE.HalfFloatType ) {
console.error( 'EXRExporter.parse: Unsupported WebGLRenderTarget texture type.' );
return false;
}
if ( renderTarget.texture.format !== THREE.RGBAFormat ) {
console.error( 'EXRExporter.parse: Unsupported WebGLRenderTarget texture format, expected THREE.RGBAFormat.' );
return false;
}
return true;
}
function buildInfo( renderTarget, options = {} ) {
const compressionSizes = {
0: 1,
2: 1,
3: 16
};
const WIDTH = renderTarget.width,
HEIGHT = renderTarget.height,
TYPE = renderTarget.texture.type,
FORMAT = renderTarget.texture.format,
ENCODING = renderTarget.texture.encoding,
COMPRESSION = options.compression !== undefined ? options.compression : ZIP_COMPRESSION,
EXPORTER_TYPE = options.type !== undefined ? options.type : THREE.HalfFloatType,
OUT_TYPE = EXPORTER_TYPE === THREE.FloatType ? 2 : 1,
COMPRESSION_SIZE = compressionSizes[ COMPRESSION ],
NUM_CHANNELS = 4;
return {
width: WIDTH,
height: HEIGHT,
type: TYPE,
format: FORMAT,
encoding: ENCODING,
compression: COMPRESSION,
blockLines: COMPRESSION_SIZE,
dataType: OUT_TYPE,
dataSize: 2 * OUT_TYPE,
numBlocks: Math.ceil( HEIGHT / COMPRESSION_SIZE ),
numInputChannels: 4,
numOutputChannels: NUM_CHANNELS
};
}
function getPixelData( renderer, rtt, info ) {
let dataBuffer;
if ( info.type === THREE.FloatType ) {
dataBuffer = new Float32Array( info.width * info.height * info.numInputChannels );
} else {
dataBuffer = new Uint16Array( info.width * info.height * info.numInputChannels );
}
renderer.readRenderTargetPixels( rtt, 0, 0, info.width, info.height, dataBuffer );
return dataBuffer;
}
function reorganizeDataBuffer( inBuffer, info ) {
const w = info.width,
h = info.height,
dec = {
r: 0,
g: 0,
b: 0,
a: 0
},
offset = {
value: 0
},
cOffset = info.numOutputChannels == 4 ? 1 : 0,
getValue = info.type == THREE.FloatType ? getFloat32 : getFloat16,
setValue = info.dataType == 1 ? setFloat16 : setFloat32,
outBuffer = new Uint8Array( info.width * info.height * info.numOutputChannels * info.dataSize ),
dv = new DataView( outBuffer.buffer );
for ( let y = 0; y < h; ++ y ) {
for ( let x = 0; x < w; ++ x ) {
const i = y * w * 4 + x * 4;
const r = getValue( inBuffer, i );
const g = getValue( inBuffer, i + 1 );
const b = getValue( inBuffer, i + 2 );
const a = getValue( inBuffer, i + 3 );
const line = ( h - y - 1 ) * w * ( 3 + cOffset ) * info.dataSize;
decodeLinear( dec, r, g, b, a );
offset.value = line + x * info.dataSize;
setValue( dv, dec.a, offset );
offset.value = line + cOffset * w * info.dataSize + x * info.dataSize;
setValue( dv, dec.b, offset );
offset.value = line + ( 1 + cOffset ) * w * info.dataSize + x * info.dataSize;
setValue( dv, dec.g, offset );
offset.value = line + ( 2 + cOffset ) * w * info.dataSize + x * info.dataSize;
setValue( dv, dec.r, offset );
}
}
return outBuffer;
}
function compressData( inBuffer, info ) {
let compress,
tmpBuffer,
sum = 0;
const chunks = {
data: new Array(),
totalSize: 0
},
size = info.width * info.numOutputChannels * info.blockLines * info.dataSize;
switch ( info.compression ) {
case 0:
compress = compressNONE;
break;
case 2:
case 3:
compress = compressZIP;
break;
}
if ( info.compression !== 0 ) {
tmpBuffer = new Uint8Array( size );
}
for ( let i = 0; i < info.numBlocks; ++ i ) {
const arr = inBuffer.subarray( size * i, size * ( i + 1 ) );
const block = compress( arr, tmpBuffer );
sum += block.length;
chunks.data.push( {
dataChunk: block,
size: block.length
} );
}
chunks.totalSize = sum;
return chunks;
}
function compressNONE( data ) {
return data;
}
function compressZIP( data, tmpBuffer ) {
//
// Reorder the pixel data.
//
let t1 = 0,
t2 = Math.floor( ( data.length + 1 ) / 2 ),
s = 0;
const stop = data.length - 1;
while ( true ) {
if ( s > stop ) break;
tmpBuffer[ t1 ++ ] = data[ s ++ ];
if ( s > stop ) break;
tmpBuffer[ t2 ++ ] = data[ s ++ ];
} //
// Predictor.
//
let p = tmpBuffer[ 0 ];
for ( let t = 1; t < tmpBuffer.length; t ++ ) {
const d = tmpBuffer[ t ] - p + ( 128 + 256 );
p = tmpBuffer[ t ];
tmpBuffer[ t ] = d;
}
if ( typeof fflate === 'undefined' ) {
console.error( 'THREE.EXRLoader: External \`fflate.module.js\` required' );
}
const deflate = fflate.zlibSync( tmpBuffer ); // eslint-disable-line no-undef
return deflate;
}
function fillHeader( outBuffer, chunks, info ) {
const offset = {
value: 0
};
const dv = new DataView( outBuffer.buffer );
setUint32( dv, 20000630, offset ); // magic
setUint32( dv, 2, offset ); // mask
// = HEADER =
setString( dv, 'compression', offset );
setString( dv, 'compression', offset );
setUint32( dv, 1, offset );
setUint8( dv, info.compression, offset );
setString( dv, 'screenWindowCenter', offset );
setString( dv, 'v2f', offset );
setUint32( dv, 8, offset );
setUint32( dv, 0, offset );
setUint32( dv, 0, offset );
setString( dv, 'screenWindowWidth', offset );
setString( dv, 'float', offset );
setUint32( dv, 4, offset );
setFloat32( dv, 1.0, offset );
setString( dv, 'pixelAspectRatio', offset );
setString( dv, 'float', offset );
setUint32( dv, 4, offset );
setFloat32( dv, 1.0, offset );
setString( dv, 'lineOrder', offset );
setString( dv, 'lineOrder', offset );
setUint32( dv, 1, offset );
setUint8( dv, 0, offset );
setString( dv, 'dataWindow', offset );
setString( dv, 'box2i', offset );
setUint32( dv, 16, offset );
setUint32( dv, 0, offset );
setUint32( dv, 0, offset );
setUint32( dv, info.width - 1, offset );
setUint32( dv, info.height - 1, offset );
setString( dv, 'displayWindow', offset );
setString( dv, 'box2i', offset );
setUint32( dv, 16, offset );
setUint32( dv, 0, offset );
setUint32( dv, 0, offset );
setUint32( dv, info.width - 1, offset );
setUint32( dv, info.height - 1, offset );
setString( dv, 'channels', offset );
setString( dv, 'chlist', offset );
setUint32( dv, info.numOutputChannels * 18 + 1, offset );
setString( dv, 'A', offset );
setUint32( dv, info.dataType, offset );
offset.value += 4;
setUint32( dv, 1, offset );
setUint32( dv, 1, offset );
setString( dv, 'B', offset );
setUint32( dv, info.dataType, offset );
offset.value += 4;
setUint32( dv, 1, offset );
setUint32( dv, 1, offset );
setString( dv, 'G', offset );
setUint32( dv, info.dataType, offset );
offset.value += 4;
setUint32( dv, 1, offset );
setUint32( dv, 1, offset );
setString( dv, 'R', offset );
setUint32( dv, info.dataType, offset );
offset.value += 4;
setUint32( dv, 1, offset );
setUint32( dv, 1, offset );
setUint8( dv, 0, offset ); // null-byte
setUint8( dv, 0, offset ); // = OFFSET TABLE =
let sum = offset.value + info.numBlocks * 8;
for ( let i = 0; i < chunks.data.length; ++ i ) {
setUint64( dv, sum, offset );
sum += chunks.data[ i ].size + 8;
}
}
function fillData( chunks, info ) {
const TableSize = info.numBlocks * 8,
HeaderSize = 259 + 18 * info.numOutputChannels,
// 259 + 18 * chlist
offset = {
value: HeaderSize + TableSize
},
outBuffer = new Uint8Array( HeaderSize + TableSize + chunks.totalSize + info.numBlocks * 8 ),
dv = new DataView( outBuffer.buffer );
fillHeader( outBuffer, chunks, info );
for ( let i = 0; i < chunks.data.length; ++ i ) {
const data = chunks.data[ i ].dataChunk;
const size = chunks.data[ i ].size;
setUint32( dv, i * info.blockLines, offset );
setUint32( dv, size, offset );
outBuffer.set( data, offset.value );
offset.value += size;
}
return outBuffer;
}
function decodeLinear( dec, r, g, b, a ) {
dec.r = r;
dec.g = g;
dec.b = b;
dec.a = a;
} // function decodeSRGB( dec, r, g, b, a ) {
// dec.r = r > 0.04045 ? Math.pow( r * 0.9478672986 + 0.0521327014, 2.4 ) : r * 0.0773993808;
// dec.g = g > 0.04045 ? Math.pow( g * 0.9478672986 + 0.0521327014, 2.4 ) : g * 0.0773993808;
// dec.b = b > 0.04045 ? Math.pow( b * 0.9478672986 + 0.0521327014, 2.4 ) : b * 0.0773993808;
// dec.a = a;
// }
function setUint8( dv, value, offset ) {
dv.setUint8( offset.value, value );
offset.value += 1;
}
function setUint32( dv, value, offset ) {
dv.setUint32( offset.value, value, true );
offset.value += 4;
}
function setFloat16( dv, value, offset ) {
dv.setUint16( offset.value, THREE.DataUtils.toHalfFloat( value ), true );
offset.value += 2;
}
function setFloat32( dv, value, offset ) {
dv.setFloat32( offset.value, value, true );
offset.value += 4;
}
function setUint64( dv, value, offset ) {
dv.setBigUint64( offset.value, BigInt( value ), true );
offset.value += 8;
}
function setString( dv, string, offset ) {
const tmp = textEncoder.encode( string + '\0' );
for ( let i = 0; i < tmp.length; ++ i ) {
setUint8( dv, tmp[ i ], offset );
}
}
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 getFloat16( arr, i ) {
return decodeFloat16( arr[ i ] );
}
function getFloat32( arr, i ) {
return arr[ i ];
}
THREE.EXRExporter = EXRExporter;
THREE.NO_COMPRESSION = NO_COMPRESSION;
THREE.ZIPS_COMPRESSION = ZIPS_COMPRESSION;
THREE.ZIP_COMPRESSION = ZIP_COMPRESSION;
} )();
