mipmaps method

Implementation

List mipmaps(bool loadMipmaps ) {
	const mipmaps = [];

	// initialize width & height for level 1
	int dataOffset = HEADER_LEN + bytesOfKeyValueData;
	int width = pixelWidth;
	int height = pixelHeight;
	final mipmapCount = loadMipmaps ? numberOfMipmapLevels : 1;

	for ( int level = 0; level < mipmapCount; level ++ ) {
		final imageSize = arrayBuffer.asInt32List(dataOffset, 1)[0];// Int32Array(arrayBuffer,  )[ 0 ]; // size per face, since not supporting array cubemaps
		dataOffset += 4; // size of the image + 4 for the imageSize field

		for ( int face = 0; face < numberOfFaces; face ++ ) {
			final byteArray = arrayBuffer.asUint8List().sublist(dataOffset, imageSize);//Uint8Array(arrayBuffer, dataOffset, imageSize );

			mipmaps.add( { 'data': byteArray, 'width': width, 'height': height } );
			dataOffset += imageSize;
			dataOffset += 3 - ( ( imageSize + 3 ) % 4 ); // add padding for odd sized image
		}

		width = math.max( 1.0, width * 0.5 ).toInt();
		height = math.max( 1.0, height * 0.5 ).toInt();
	}

	return mipmaps;
}