81 lines
3.8 KiB
JavaScript
81 lines
3.8 KiB
JavaScript
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define([
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'../../Core/ComponentDatatype'
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], function(
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ComponentDatatype) {
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'use strict';
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/**
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* Returns a function to read and convert data from a DataView into an array.
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*
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* @param {Number} componentType Type to convert the data to.
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* @returns {ComponentReader} Function that reads and converts data.
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*
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* @private
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*/
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function getComponentReader(componentType) {
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switch (componentType) {
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case ComponentDatatype.BYTE:
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return function (dataView, byteOffset, numberOfComponents, componentTypeByteLength, result) {
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for (var i = 0; i < numberOfComponents; ++i) {
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result[i] = dataView.getInt8(byteOffset + i * componentTypeByteLength);
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}
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};
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case ComponentDatatype.UNSIGNED_BYTE:
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return function (dataView, byteOffset, numberOfComponents, componentTypeByteLength, result) {
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for (var i = 0; i < numberOfComponents; ++i) {
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result[i] = dataView.getUint8(byteOffset + i * componentTypeByteLength);
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}
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};
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case ComponentDatatype.SHORT:
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return function (dataView, byteOffset, numberOfComponents, componentTypeByteLength, result) {
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for (var i = 0; i < numberOfComponents; ++i) {
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result[i] = dataView.getInt16(byteOffset + i * componentTypeByteLength, true);
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}
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};
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case ComponentDatatype.UNSIGNED_SHORT:
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return function (dataView, byteOffset, numberOfComponents, componentTypeByteLength, result) {
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for (var i = 0; i < numberOfComponents; ++i) {
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result[i] = dataView.getUint16(byteOffset + i * componentTypeByteLength, true);
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}
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};
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case ComponentDatatype.INT:
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return function (dataView, byteOffset, numberOfComponents, componentTypeByteLength, result) {
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for (var i = 0; i < numberOfComponents; ++i) {
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result[i] = dataView.getInt32(byteOffset + i * componentTypeByteLength, true);
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}
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};
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case ComponentDatatype.UNSIGNED_INT:
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return function (dataView, byteOffset, numberOfComponents, componentTypeByteLength, result) {
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for (var i = 0; i < numberOfComponents; ++i) {
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result[i] = dataView.getUint32(byteOffset + i * componentTypeByteLength, true);
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}
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};
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case ComponentDatatype.FLOAT:
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return function (dataView, byteOffset, numberOfComponents, componentTypeByteLength, result) {
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for (var i = 0; i < numberOfComponents; ++i) {
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result[i] = dataView.getFloat32(byteOffset + i * componentTypeByteLength, true);
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}
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};
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case ComponentDatatype.DOUBLE:
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return function (dataView, byteOffset, numberOfComponents, componentTypeByteLength, result) {
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for (var i = 0; i < numberOfComponents; ++i) {
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result[i] = dataView.getFloat64(byteOffset + i * componentTypeByteLength, true);
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}
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};
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}
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}
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/**
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* A callback function that logs messages.
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* @callback ComponentReader
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*
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* @param {DataView} dataView The data view to read from.
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* @param {Number} byteOffset The byte offset applied when reading from the data view.
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* @param {Number} numberOfComponents The number of components to read.
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* @param {Number} componentTypeByteLength The byte length of each component.
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* @param {Number} result An array storing the components that are read.
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*/
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return getComponentReader;
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});
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