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+/**
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+ * @author amakaseev / https://github.com/amakaseev
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+ *
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+ * for description see https://www.khronos.org/opengles/sdk/tools/KTX/
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+ * for file layout see https://www.khronos.org/opengles/sdk/tools/KTX/file_format_spec/
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+ *
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+ * ported from https://github.com/BabylonJS/Babylon.js/blob/master/src/Tools/babylon.khronosTextureContainer.ts
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+ */
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+
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+import {
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+ CompressedTextureLoader
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+} from "../../../build/three.module.js";
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+
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+
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+var KTXLoader = function ( manager ) {
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+
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+ CompressedTextureLoader.call( this, manager );
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+
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+ this._parser = KTXLoader.parse;
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+
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+};
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+
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+KTXLoader.prototype = Object.create( CompressedTextureLoader.prototype );
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+KTXLoader.prototype.constructor = KTXLoader;
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+
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+KTXLoader.parse = function ( buffer, loadMipmaps ) {
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+
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+ var ktx = new KhronosTextureContainer( buffer, 1 );
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+
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+ return {
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+ mipmaps: ktx.mipmaps( loadMipmaps ),
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+ width: ktx.pixelWidth,
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+ height: ktx.pixelHeight,
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+ format: ktx.glInternalFormat,
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+ isCubemap: ktx.numberOfFaces === 6,
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+ mipmapCount: ktx.numberOfMipmapLevels
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+ };
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+
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+};
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+
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+var KhronosTextureContainer = ( function () {
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+
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+ /**
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+ * @param {ArrayBuffer} arrayBuffer- contents of the KTX container file
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+ * @param {number} facesExpected- should be either 1 or 6, based whether a cube texture or or
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+ * @param {boolean} threeDExpected- provision for indicating that data should be a 3D texture, not implemented
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+ * @param {boolean} textureArrayExpected- provision for indicating that data should be a texture array, not implemented
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+ */
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+ function KhronosTextureContainer( arrayBuffer, facesExpected /*, threeDExpected, textureArrayExpected */ ) {
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+
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+ this.arrayBuffer = arrayBuffer;
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+
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+ // Test that it is a ktx formatted file, based on the first 12 bytes, character representation is:
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+ // '´', 'K', 'T', 'X', ' ', '1', '1', 'ª', '\r', '\n', '\x1A', '\n'
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+ // 0xAB, 0x4B, 0x54, 0x58, 0x20, 0x31, 0x31, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A
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+ var identifier = new Uint8Array( this.arrayBuffer, 0, 12 );
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+ if ( identifier[ 0 ] !== 0xAB ||
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+ identifier[ 1 ] !== 0x4B ||
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+ identifier[ 2 ] !== 0x54 ||
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+ identifier[ 3 ] !== 0x58 ||
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+ identifier[ 4 ] !== 0x20 ||
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+ identifier[ 5 ] !== 0x31 ||
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+ identifier[ 6 ] !== 0x31 ||
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+ identifier[ 7 ] !== 0xBB ||
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+ identifier[ 8 ] !== 0x0D ||
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+ identifier[ 9 ] !== 0x0A ||
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+ identifier[ 10 ] !== 0x1A ||
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+ identifier[ 11 ] !== 0x0A ) {
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+
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+ console.error( 'texture missing KTX identifier' );
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+ return;
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+
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+ }
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+
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+ // load the reset of the header in native 32 bit uint
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+ var dataSize = Uint32Array.BYTES_PER_ELEMENT;
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+ var headerDataView = new DataView( this.arrayBuffer, 12, 13 * dataSize );
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+ var endianness = headerDataView.getUint32( 0, true );
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+ var littleEndian = endianness === 0x04030201;
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+
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+ this.glType = headerDataView.getUint32( 1 * dataSize, littleEndian ); // must be 0 for compressed textures
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+ this.glTypeSize = headerDataView.getUint32( 2 * dataSize, littleEndian ); // must be 1 for compressed textures
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+ this.glFormat = headerDataView.getUint32( 3 * dataSize, littleEndian ); // must be 0 for compressed textures
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+ this.glInternalFormat = headerDataView.getUint32( 4 * dataSize, littleEndian ); // the value of arg passed to gl.compressedTexImage2D(,,x,,,,)
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+ this.glBaseInternalFormat = headerDataView.getUint32( 5 * dataSize, littleEndian ); // specify GL_RGB, GL_RGBA, GL_ALPHA, etc (un-compressed only)
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+ this.pixelWidth = headerDataView.getUint32( 6 * dataSize, littleEndian ); // level 0 value of arg passed to gl.compressedTexImage2D(,,,x,,,)
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+ this.pixelHeight = headerDataView.getUint32( 7 * dataSize, littleEndian ); // level 0 value of arg passed to gl.compressedTexImage2D(,,,,x,,)
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+ this.pixelDepth = headerDataView.getUint32( 8 * dataSize, littleEndian ); // level 0 value of arg passed to gl.compressedTexImage3D(,,,,,x,,)
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+ this.numberOfArrayElements = headerDataView.getUint32( 9 * dataSize, littleEndian ); // used for texture arrays
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+ this.numberOfFaces = headerDataView.getUint32( 10 * dataSize, littleEndian ); // used for cubemap textures, should either be 1 or 6
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+ this.numberOfMipmapLevels = headerDataView.getUint32( 11 * dataSize, littleEndian ); // number of levels; disregard possibility of 0 for compressed textures
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+ this.bytesOfKeyValueData = headerDataView.getUint32( 12 * dataSize, littleEndian ); // the amount of space after the header for meta-data
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+
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+ // Make sure we have a compressed type. Not only reduces work, but probably better to let dev know they are not compressing.
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+ if ( this.glType !== 0 ) {
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+
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+ console.warn( 'only compressed formats currently supported' );
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+ return;
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+
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+ } else {
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+
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+ // value of zero is an indication to generate mipmaps @ runtime. Not usually allowed for compressed, so disregard.
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+ this.numberOfMipmapLevels = Math.max( 1, this.numberOfMipmapLevels );
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+
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+ }
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+ if ( this.pixelHeight === 0 || this.pixelDepth !== 0 ) {
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+
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+ console.warn( 'only 2D textures currently supported' );
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+ return;
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+
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+ }
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+ if ( this.numberOfArrayElements !== 0 ) {
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+
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+ console.warn( 'texture arrays not currently supported' );
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+ return;
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+
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+ }
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+ if ( this.numberOfFaces !== facesExpected ) {
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+
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+ console.warn( 'number of faces expected' + facesExpected + ', but found ' + this.numberOfFaces );
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+ return;
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+
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+ }
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+ // we now have a completely validated file, so could use existence of loadType as success
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+ // would need to make this more elaborate & adjust checks above to support more than one load type
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+ this.loadType = KhronosTextureContainer.COMPRESSED_2D;
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+
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+ }
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+
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+ // return mipmaps for js
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+ KhronosTextureContainer.prototype.mipmaps = function ( loadMipmaps ) {
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+
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+ var mipmaps = [];
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+
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+ // initialize width & height for level 1
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+ var dataOffset = KhronosTextureContainer.HEADER_LEN + this.bytesOfKeyValueData;
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+ var width = this.pixelWidth;
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+ var height = this.pixelHeight;
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+ var mipmapCount = loadMipmaps ? this.numberOfMipmapLevels : 1;
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+
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+ for ( var level = 0; level < mipmapCount; level ++ ) {
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+
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+ var imageSize = new Int32Array( this.arrayBuffer, dataOffset, 1 )[ 0 ]; // size per face, since not supporting array cubemaps
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+ dataOffset += 4; // size of the image + 4 for the imageSize field
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+
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+ for ( var face = 0; face < this.numberOfFaces; face ++ ) {
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+
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+ var byteArray = new Uint8Array( this.arrayBuffer, dataOffset, imageSize );
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+
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+ mipmaps.push( { "data": byteArray, "width": width, "height": height } );
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+
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+ dataOffset += imageSize;
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+ dataOffset += 3 - ( ( imageSize + 3 ) % 4 ); // add padding for odd sized image
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+
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+ }
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+ width = Math.max( 1.0, width * 0.5 );
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+ height = Math.max( 1.0, height * 0.5 );
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+
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+ }
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+
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+ return mipmaps;
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+
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+ };
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+
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+ KhronosTextureContainer.HEADER_LEN = 12 + ( 13 * 4 ); // identifier + header elements (not including key value meta-data pairs)
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+ // load types
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+ KhronosTextureContainer.COMPRESSED_2D = 0; // uses a gl.compressedTexImage2D()
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+ KhronosTextureContainer.COMPRESSED_3D = 1; // uses a gl.compressedTexImage3D()
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+ KhronosTextureContainer.TEX_2D = 2; // uses a gl.texImage2D()
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+ KhronosTextureContainer.TEX_3D = 3; // uses a gl.texImage3D()
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+
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+ return KhronosTextureContainer;
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+
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+}() );
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+
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+export { KTXLoader };
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Mugen87