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import DataAccessHelper from 'vtk.js/Sources/IO/Core/DataAccessHelper';
import vtkCellArray from 'vtk.js/Sources/Common/Core/CellArray';
import vtkDataArray from 'vtk.js/Sources/Common/Core/DataArray';
import vtkPolyData from 'vtk.js/Sources/Common/DataModel/PolyData';
import vtkPolyDataNormals from 'vtk.js/Sources/Filters/Core/PolyDataNormals';
// Enable data soure for DataAccessHelper
import 'vtk.js/Sources/IO/Core/DataAccessHelper/LiteHttpDataAccessHelper'; // Just need HTTP
// import 'vtk.js/Sources/IO/Core/DataAccessHelper/HttpDataAccessHelper'; // HTTP + zip
// import 'vtk.js/Sources/IO/Core/DataAccessHelper/HtmlDataAccessHelper'; // html + base64 + zip
// import 'vtk.js/Sources/IO/Core/DataAccessHelper/JSZipDataAccessHelper'; // zip
const { vtkErrorMacro } = macro;
let decoderModule = null;
// ----------------------------------------------------------------------------
// static methods
// ----------------------------------------------------------------------------
/**
* Load the WASM decoder from url and set the decoderModule
* @param url
* @param binaryName
* @return {Promise<boolean>}
*/
function setWasmBinary(url, binaryName) {
const dracoDecoderType = {};
return new Promise((resolve, reject) => {
dracoDecoderType.wasmBinaryFile = binaryName;
const xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.responseType = 'arraybuffer';
xhr.onload = () => {
if (xhr.status === 200) {
dracoDecoderType.wasmBinary = xhr.response;
// Use Promise.resolve to be compatible with versions before Draco 1.4.0
Promise.resolve(window.DracoDecoderModule(dracoDecoderType)).then(
(module) => {
decoderModule = module;
resolve(true);
},
reject
);
} else {
reject(Error(`WASM binary could not be loaded: ${xhr.statusText}`));
}
};
xhr.send(null);
});
}
/**
* Set the Draco decoder module
* @param {*} dracoDecoder
*/
async function setDracoDecoder(dracoDecoder) {
decoderModule = await dracoDecoder({});
}
function getDracoDecoder() {
return decoderModule;
}
// ----------------------------------------------------------------------------
// vtkDracoReader methods
// ----------------------------------------------------------------------------
function getDracoDataType(attributeType) {
switch (attributeType) {
case Float32Array:
return decoderModule.DT_FLOAT32;
case Int8Array:
return decoderModule.DT_INT8;
case Int16Array:
return decoderModule.DT_INT16;
case Int32Array:
return decoderModule.DT_INT32;
case Uint8Array:
return decoderModule.DT_UINT8;
case Uint16Array:
return decoderModule.DT_UINT16;
case Uint32Array:
return decoderModule.DT_UINT32;
default:
return decoderModule.DT_FLOAT32;
}
}
/**
* Decode a single attribute
* @param {*} decoder The Draco decoder
* @param {*} dracoGeometry The geometry to decode
* @param {*} attributeName The name of the attribute
* @param {*} attributeType The type of the attribute
* @param {*} attribute The attribute to decode
* @returns object with name, array, itemSize
*/
function decodeAttribute(
decoder,
dracoGeometry,
attributeName,
attributeType,
attribute
) {
const numComponents = attribute.num_components();
const numPoints = dracoGeometry.num_points();
const numValues = numPoints * numComponents;
const byteLength = numValues * attributeType.BYTES_PER_ELEMENT;
const dataType = getDracoDataType(attributeType);
const ptr = decoderModule._malloc(byteLength);
decoder.GetAttributeDataArrayForAllPoints(
dracoGeometry,
attribute,
dataType,
byteLength,
ptr
);
// eslint-disable-next-line new-cap
const array = new attributeType(
decoderModule.HEAPF32.buffer,
ptr,
numValues
).slice();
decoderModule._free(ptr);
return {
name: attributeName,
array,
itemSize: numComponents,
};
}
/**
* Decode the indices of the geometry
* @param {*} decoder The Draco decoder
* @param {*} dracoGeometry The geometry to decode
* @returns The indices array of the geometry
*/
function decodeIndices(decoder, dracoGeometry) {
const numFaces = dracoGeometry.num_faces();
const numIndices = numFaces * 3;
const byteLength = numIndices * 4;
const ptr = decoderModule._malloc(byteLength);
decoder.GetTrianglesUInt32Array(dracoGeometry, byteLength, ptr);
const indices = new Uint32Array(
decoderModule.HEAPF32.buffer,
ptr,
numIndices
).slice();
decoderModule._free(ptr);
return indices;
}
/**
* Get the polyData from the Draco geometry
* @param {*} decoder The Draco decoder
* @param {*} dracoGeometry The geometry to decode
* @returns {vtkPolyData} The polyData of the geometry
*/
function getPolyDataFromDracoGeometry(decoder, dracoGeometry) {
const indices = decodeIndices(decoder, dracoGeometry);
const nCells = indices.length - 2;
const cells = vtkCellArray.newInstance();
cells.resize((4 * indices.length) / 3);
for (let cellId = 0; cellId < nCells; cellId += 3) {
const cell = indices.slice(cellId, cellId + 3);
cells.insertNextCell(cell);
}
const polyData = vtkPolyData.newInstance({ polys: cells });
// Look for attributes
const attributeIDs = {
points: 'POSITION',
normals: 'NORMAL',
scalars: 'COLOR',
tcoords: 'TEX_COORD',
};
Object.keys(attributeIDs).forEach((attributeName) => {
const attributeType = Float32Array;
const attributeID = decoder.GetAttributeId(
dracoGeometry,
decoderModule[attributeIDs[attributeName]]
);
if (attributeID === -1) return;
const attribute = decoder.GetAttribute(dracoGeometry, attributeID);
const attributeResult = decodeAttribute(
decoder,
dracoGeometry,
attributeName,
attributeType,
attribute
);
const pointData = polyData.getPointData();
switch (attributeName) {
case 'points':
polyData
.getPoints()
.setData(attributeResult.array, attributeResult.itemSize);
break;
case 'normals':
pointData.setNormals(
vtkDataArray.newInstance({
numberOfComponents: attributeResult.itemSize,
values: attributeResult.array,
name: 'Normals',
})
);
break;
case 'scalars':
pointData.setScalars(
vtkDataArray.newInstance({
numberOfComponents: attributeResult.itemSize,
values: attributeResult.array,
name: 'Scalars',
})
);
break;
case 'tcoords':
pointData.setTCoords(
vtkDataArray.newInstance({
numberOfComponents: attributeResult.itemSize,
values: attributeResult.array,
name: 'TCoords',
})
);
break;
default:
break;
}
});
// we will generate normals if they're missing
const hasNormals = polyData.getPointData().getNormals();
if (!hasNormals) {
const pdn = vtkPolyDataNormals.newInstance();
pdn.setInputData(polyData);
pdn.setComputePointNormals(true);
return pdn.getOutputData();
}
return polyData;
}
function vtkDracoReader(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkDracoReader');
// Create default dataAccessHelper if not available
if (!model.dataAccessHelper) {
model.dataAccessHelper = DataAccessHelper.get('http');
}
// Internal method to fetch Array
function fetchData(url, option = {}) {
const { compression, progressCallback } = model;
if (option.binary) {
return model.dataAccessHelper.fetchBinary(url, {
compression,
progressCallback,
});
}
return model.dataAccessHelper.fetchText(publicAPI, url, {
compression,
progressCallback,
});
}
// Set DataSet url
publicAPI.setUrl = (url, option = { binary: true }) => {
model.url = url;
// Remove the file in the URL
const path = url.split('/');
path.pop();
model.baseURL = path.join('/');
model.compression = option.compression;
// Fetch metadata
return publicAPI.loadData({
progressCallback: option.progressCallback,
binary: !!option.binary,
});
};
// Fetch the actual data arrays
publicAPI.loadData = (option = {}) => {
const promise = fetchData(model.url, option);
promise.then(publicAPI.parse);
return promise;
};
publicAPI.parse = (content) => {
publicAPI.parseAsArrayBuffer(content);
};
publicAPI.parseAsArrayBuffer = (content) => {
if (!content) {
return;
}
if (content !== model.parseData) {
publicAPI.modified();
} else {
return;
}
model.parseData = content;
const byteArray = new Int8Array(content);
const decoder = new decoderModule.Decoder();
const buffer = new decoderModule.DecoderBuffer();
buffer.Init(byteArray, byteArray.length);
const geometryType = decoder.GetEncodedGeometryType(buffer);
let dracoGeometry;
if (geometryType === decoderModule.TRIANGULAR_MESH) {
dracoGeometry = new decoderModule.Mesh();
const status = decoder.DecodeBufferToMesh(buffer, dracoGeometry);
if (!status.ok()) {
vtkErrorMacro(`Could not decode Draco file: ${status.error_msg()}`);
return;
}
} else {
vtkErrorMacro('Wrong geometry type, expected mesh, got point cloud.');
return;
}
const polyData = getPolyDataFromDracoGeometry(decoder, dracoGeometry);
decoderModule.destroy(dracoGeometry);
decoderModule.destroy(buffer);
decoderModule.destroy(decoder);
model.output[0] = polyData;
};
publicAPI.requestData = () => {
publicAPI.parse(model.parseData);
};
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
// baseURL: null,
// dataAccessHelper: null,
// url: null,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Build VTK API
macro.obj(publicAPI, model);
macro.get(publicAPI, model, ['url', 'baseURL']);
macro.setGet(publicAPI, model, ['dataAccessHelper']);
macro.algo(publicAPI, model, 0, 1);
// vtkDracoReader methods
vtkDracoReader(publicAPI, model);
// To support destructuring
if (!model.compression) {
model.compression = null;
}
if (!model.progressCallback) {
model.progressCallback = null;
}
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(extend, 'vtkDracoReader');
// ----------------------------------------------------------------------------
export default {
extend,
newInstance,
setDracoDecoder,
setWasmBinary,
getDracoDecoder,
};
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