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507 lines
10 KiB
507 lines
10 KiB
/**
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* @author sciecode / https://github.com/sciecode
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*
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* EXR format references:
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* https://www.openexr.com/documentation/openexrfilelayout.pdf
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*/
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import {
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FloatType,
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HalfFloatType,
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RGBAFormat,
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DataUtils,
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} from 'three';
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import * as fflate from '../libs/fflate.module.js';
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const textEncoder = new TextEncoder();
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const NO_COMPRESSION = 0;
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const ZIPS_COMPRESSION = 2;
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const ZIP_COMPRESSION = 3;
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class EXRExporter {
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parse( renderer, renderTarget, options ) {
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if ( ! supported( renderer, renderTarget ) ) return undefined;
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const info = buildInfo( renderTarget, options ),
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dataBuffer = getPixelData( renderer, renderTarget, info ),
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rawContentBuffer = reorganizeDataBuffer( dataBuffer, info ),
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chunks = compressData( rawContentBuffer, info );
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return fillData( chunks, info );
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}
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}
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function supported( renderer, renderTarget ) {
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if ( ! renderer || ! renderer.isWebGLRenderer ) {
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console.error( 'EXRExporter.parse: Unsupported first parameter, expected instance of WebGLRenderer.' );
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return false;
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}
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if ( ! renderTarget || ! renderTarget.isWebGLRenderTarget ) {
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console.error( 'EXRExporter.parse: Unsupported second parameter, expected instance of WebGLRenderTarget.' );
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return false;
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}
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if ( renderTarget.texture.type !== FloatType && renderTarget.texture.type !== HalfFloatType ) {
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console.error( 'EXRExporter.parse: Unsupported WebGLRenderTarget texture type.' );
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return false;
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}
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if ( renderTarget.texture.format !== RGBAFormat ) {
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console.error( 'EXRExporter.parse: Unsupported WebGLRenderTarget texture format, expected RGBAFormat.' );
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return false;
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}
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return true;
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}
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function buildInfo( renderTarget, options = {} ) {
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const compressionSizes = {
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0: 1,
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2: 1,
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3: 16
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};
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const WIDTH = renderTarget.width,
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HEIGHT = renderTarget.height,
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TYPE = renderTarget.texture.type,
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FORMAT = renderTarget.texture.format,
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ENCODING = renderTarget.texture.encoding,
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COMPRESSION = ( options.compression !== undefined ) ? options.compression : ZIP_COMPRESSION,
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EXPORTER_TYPE = ( options.type !== undefined ) ? options.type : HalfFloatType,
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OUT_TYPE = ( EXPORTER_TYPE === FloatType ) ? 2 : 1,
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COMPRESSION_SIZE = compressionSizes[ COMPRESSION ],
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NUM_CHANNELS = 4;
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return {
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width: WIDTH,
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height: HEIGHT,
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type: TYPE,
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format: FORMAT,
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encoding: ENCODING,
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compression: COMPRESSION,
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blockLines: COMPRESSION_SIZE,
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dataType: OUT_TYPE,
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dataSize: 2 * OUT_TYPE,
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numBlocks: Math.ceil( HEIGHT / COMPRESSION_SIZE ),
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numInputChannels: 4,
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numOutputChannels: NUM_CHANNELS,
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};
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}
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function getPixelData( renderer, rtt, info ) {
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let dataBuffer;
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if ( info.type === FloatType ) {
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dataBuffer = new Float32Array( info.width * info.height * info.numInputChannels );
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} else {
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dataBuffer = new Uint16Array( info.width * info.height * info.numInputChannels );
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}
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renderer.readRenderTargetPixels( rtt, 0, 0, info.width, info.height, dataBuffer );
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return dataBuffer;
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}
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function reorganizeDataBuffer( inBuffer, info ) {
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const w = info.width,
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h = info.height,
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dec = { r: 0, g: 0, b: 0, a: 0 },
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offset = { value: 0 },
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cOffset = ( info.numOutputChannels == 4 ) ? 1 : 0,
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getValue = ( info.type == FloatType ) ? getFloat32 : getFloat16,
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setValue = ( info.dataType == 1 ) ? setFloat16 : setFloat32,
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outBuffer = new Uint8Array( info.width * info.height * info.numOutputChannels * info.dataSize ),
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dv = new DataView( outBuffer.buffer );
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for ( let y = 0; y < h; ++ y ) {
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for ( let x = 0; x < w; ++ x ) {
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const i = y * w * 4 + x * 4;
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const r = getValue( inBuffer, i );
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const g = getValue( inBuffer, i + 1 );
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const b = getValue( inBuffer, i + 2 );
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const a = getValue( inBuffer, i + 3 );
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const line = ( h - y - 1 ) * w * ( 3 + cOffset ) * info.dataSize;
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decodeLinear( dec, r, g, b, a );
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offset.value = line + x * info.dataSize;
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setValue( dv, dec.a, offset );
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offset.value = line + ( cOffset ) * w * info.dataSize + x * info.dataSize;
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setValue( dv, dec.b, offset );
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offset.value = line + ( 1 + cOffset ) * w * info.dataSize + x * info.dataSize;
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setValue( dv, dec.g, offset );
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offset.value = line + ( 2 + cOffset ) * w * info.dataSize + x * info.dataSize;
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setValue( dv, dec.r, offset );
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}
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}
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return outBuffer;
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}
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function compressData( inBuffer, info ) {
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let compress,
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tmpBuffer,
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sum = 0;
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const chunks = { data: new Array(), totalSize: 0 },
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size = info.width * info.numOutputChannels * info.blockLines * info.dataSize;
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switch ( info.compression ) {
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case 0:
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compress = compressNONE;
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break;
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case 2:
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case 3:
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compress = compressZIP;
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break;
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}
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if ( info.compression !== 0 ) {
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tmpBuffer = new Uint8Array( size );
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}
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for ( let i = 0; i < info.numBlocks; ++ i ) {
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const arr = inBuffer.subarray( size * i, size * ( i + 1 ) );
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const block = compress( arr, tmpBuffer );
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sum += block.length;
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chunks.data.push( { dataChunk: block, size: block.length } );
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}
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chunks.totalSize = sum;
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return chunks;
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}
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function compressNONE( data ) {
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return data;
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}
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function compressZIP( data, tmpBuffer ) {
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//
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// Reorder the pixel data.
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//
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let t1 = 0,
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t2 = Math.floor( ( data.length + 1 ) / 2 ),
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s = 0;
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const stop = data.length - 1;
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while ( true ) {
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if ( s > stop ) break;
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tmpBuffer[ t1 ++ ] = data[ s ++ ];
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if ( s > stop ) break;
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tmpBuffer[ t2 ++ ] = data[ s ++ ];
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}
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//
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// Predictor.
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//
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let p = tmpBuffer[ 0 ];
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for ( let t = 1; t < tmpBuffer.length; t ++ ) {
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const d = tmpBuffer[ t ] - p + ( 128 + 256 );
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p = tmpBuffer[ t ];
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tmpBuffer[ t ] = d;
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}
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if ( typeof fflate === 'undefined' ) {
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console.error( 'THREE.EXRLoader: External \`fflate.module.js\` required' );
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}
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const deflate = fflate.zlibSync( tmpBuffer ); // eslint-disable-line no-undef
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return deflate;
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}
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function fillHeader( outBuffer, chunks, info ) {
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const offset = { value: 0 };
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const dv = new DataView( outBuffer.buffer );
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setUint32( dv, 20000630, offset ); // magic
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setUint32( dv, 2, offset ); // mask
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// = HEADER =
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setString( dv, 'compression', offset );
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setString( dv, 'compression', offset );
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setUint32( dv, 1, offset );
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setUint8( dv, info.compression, offset );
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setString( dv, 'screenWindowCenter', offset );
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setString( dv, 'v2f', offset );
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setUint32( dv, 8, offset );
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setUint32( dv, 0, offset );
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setUint32( dv, 0, offset );
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setString( dv, 'screenWindowWidth', offset );
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setString( dv, 'float', offset );
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setUint32( dv, 4, offset );
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setFloat32( dv, 1.0, offset );
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setString( dv, 'pixelAspectRatio', offset );
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setString( dv, 'float', offset );
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setUint32( dv, 4, offset );
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setFloat32( dv, 1.0, offset );
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setString( dv, 'lineOrder', offset );
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setString( dv, 'lineOrder', offset );
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setUint32( dv, 1, offset );
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setUint8( dv, 0, offset );
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setString( dv, 'dataWindow', offset );
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setString( dv, 'box2i', offset );
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setUint32( dv, 16, offset );
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setUint32( dv, 0, offset );
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setUint32( dv, 0, offset );
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setUint32( dv, info.width - 1, offset );
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setUint32( dv, info.height - 1, offset );
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setString( dv, 'displayWindow', offset );
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setString( dv, 'box2i', offset );
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setUint32( dv, 16, offset );
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setUint32( dv, 0, offset );
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setUint32( dv, 0, offset );
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setUint32( dv, info.width - 1, offset );
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setUint32( dv, info.height - 1, offset );
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setString( dv, 'channels', offset );
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setString( dv, 'chlist', offset );
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setUint32( dv, info.numOutputChannels * 18 + 1, offset );
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setString( dv, 'A', offset );
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setUint32( dv, info.dataType, offset );
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offset.value += 4;
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setUint32( dv, 1, offset );
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setUint32( dv, 1, offset );
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setString( dv, 'B', offset );
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setUint32( dv, info.dataType, offset );
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offset.value += 4;
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setUint32( dv, 1, offset );
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setUint32( dv, 1, offset );
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setString( dv, 'G', offset );
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setUint32( dv, info.dataType, offset );
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offset.value += 4;
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setUint32( dv, 1, offset );
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setUint32( dv, 1, offset );
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setString( dv, 'R', offset );
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setUint32( dv, info.dataType, offset );
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offset.value += 4;
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setUint32( dv, 1, offset );
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setUint32( dv, 1, offset );
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setUint8( dv, 0, offset );
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// null-byte
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setUint8( dv, 0, offset );
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// = OFFSET TABLE =
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let sum = offset.value + info.numBlocks * 8;
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for ( let i = 0; i < chunks.data.length; ++ i ) {
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setUint64( dv, sum, offset );
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sum += chunks.data[ i ].size + 8;
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}
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}
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function fillData( chunks, info ) {
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const TableSize = info.numBlocks * 8,
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HeaderSize = 259 + ( 18 * info.numOutputChannels ), // 259 + 18 * chlist
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offset = { value: HeaderSize + TableSize },
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outBuffer = new Uint8Array( HeaderSize + TableSize + chunks.totalSize + info.numBlocks * 8 ),
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dv = new DataView( outBuffer.buffer );
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fillHeader( outBuffer, chunks, info );
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for ( let i = 0; i < chunks.data.length; ++ i ) {
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const data = chunks.data[ i ].dataChunk;
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const size = chunks.data[ i ].size;
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setUint32( dv, i * info.blockLines, offset );
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setUint32( dv, size, offset );
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outBuffer.set( data, offset.value );
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offset.value += size;
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}
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return outBuffer;
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}
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function decodeLinear( dec, r, g, b, a ) {
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dec.r = r;
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dec.g = g;
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dec.b = b;
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dec.a = a;
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}
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// function decodeSRGB( dec, r, g, b, a ) {
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// dec.r = r > 0.04045 ? Math.pow( r * 0.9478672986 + 0.0521327014, 2.4 ) : r * 0.0773993808;
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// dec.g = g > 0.04045 ? Math.pow( g * 0.9478672986 + 0.0521327014, 2.4 ) : g * 0.0773993808;
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// dec.b = b > 0.04045 ? Math.pow( b * 0.9478672986 + 0.0521327014, 2.4 ) : b * 0.0773993808;
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// dec.a = a;
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// }
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function setUint8( dv, value, offset ) {
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dv.setUint8( offset.value, value );
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offset.value += 1;
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}
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function setUint32( dv, value, offset ) {
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dv.setUint32( offset.value, value, true );
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offset.value += 4;
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}
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function setFloat16( dv, value, offset ) {
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dv.setUint16( offset.value, DataUtils.toHalfFloat( value ), true );
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offset.value += 2;
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}
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function setFloat32( dv, value, offset ) {
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dv.setFloat32( offset.value, value, true );
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offset.value += 4;
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}
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function setUint64( dv, value, offset ) {
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dv.setBigUint64( offset.value, BigInt( value ), true );
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offset.value += 8;
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}
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function setString( dv, string, offset ) {
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const tmp = textEncoder.encode( string + '\0' );
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for ( let i = 0; i < tmp.length; ++ i ) {
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setUint8( dv, tmp[ i ], offset );
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}
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}
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function decodeFloat16( binary ) {
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const exponent = ( binary & 0x7C00 ) >> 10,
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fraction = binary & 0x03FF;
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return ( binary >> 15 ? - 1 : 1 ) * (
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exponent ?
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(
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exponent === 0x1F ?
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fraction ? NaN : Infinity :
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Math.pow( 2, exponent - 15 ) * ( 1 + fraction / 0x400 )
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) :
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6.103515625e-5 * ( fraction / 0x400 )
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);
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}
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function getFloat16( arr, i ) {
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return decodeFloat16( arr[ i ] );
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}
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function getFloat32( arr, i ) {
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return arr[ i ];
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}
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export { EXRExporter, NO_COMPRESSION, ZIP_COMPRESSION, ZIPS_COMPRESSION };
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