/**
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* Cesium - https://github.com/CesiumGS/cesium
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*
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* Copyright 2011-2020 Cesium Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Columbus View (Pat. Pend.)
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*
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* Portions licensed separately.
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* See https://github.com/CesiumGS/cesium/blob/master/LICENSE.md for full licensing details.
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*/
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define(['exports', './when-8d13db60', './Check-70bec281', './Math-61ede240', './WebGLConstants-4c11ee5f'], function (exports, when, Check, _Math, WebGLConstants) { 'use strict';
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/**
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* Constants for WebGL index datatypes. These corresponds to the
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* <code>type</code> parameter of {@link http://www.khronos.org/opengles/sdk/docs/man/xhtml/glDrawElements.xml|drawElements}.
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*
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* @exports IndexDatatype
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*/
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var IndexDatatype = {
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/**
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* 8-bit unsigned byte corresponding to <code>UNSIGNED_BYTE</code> and the type
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* of an element in <code>Uint8Array</code>.
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*
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* @type {Number}
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* @constant
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*/
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UNSIGNED_BYTE : WebGLConstants.WebGLConstants.UNSIGNED_BYTE,
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/**
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* 16-bit unsigned short corresponding to <code>UNSIGNED_SHORT</code> and the type
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* of an element in <code>Uint16Array</code>.
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*
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* @type {Number}
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* @constant
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*/
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UNSIGNED_SHORT : WebGLConstants.WebGLConstants.UNSIGNED_SHORT,
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/**
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* 32-bit unsigned int corresponding to <code>UNSIGNED_INT</code> and the type
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* of an element in <code>Uint32Array</code>.
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*
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* @type {Number}
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* @constant
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*/
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UNSIGNED_INT : WebGLConstants.WebGLConstants.UNSIGNED_INT
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};
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/**
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* Returns the size, in bytes, of the corresponding datatype.
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*
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* @param {IndexDatatype} indexDatatype The index datatype to get the size of.
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* @returns {Number} The size in bytes.
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*
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* @example
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* // Returns 2
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* var size = Cesium.IndexDatatype.getSizeInBytes(Cesium.IndexDatatype.UNSIGNED_SHORT);
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*/
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IndexDatatype.getSizeInBytes = function(indexDatatype) {
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switch(indexDatatype) {
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case IndexDatatype.UNSIGNED_BYTE:
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return Uint8Array.BYTES_PER_ELEMENT;
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case IndexDatatype.UNSIGNED_SHORT:
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return Uint16Array.BYTES_PER_ELEMENT;
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case IndexDatatype.UNSIGNED_INT:
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return Uint32Array.BYTES_PER_ELEMENT;
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}
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//>>includeStart('debug', pragmas.debug);
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throw new Check.DeveloperError('indexDatatype is required and must be a valid IndexDatatype constant.');
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//>>includeEnd('debug');
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};
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/**
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* Gets the datatype with a given size in bytes.
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*
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* @param {Number} sizeInBytes The size of a single index in bytes.
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* @returns {IndexDatatype} The index datatype with the given size.
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*/
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IndexDatatype.fromSizeInBytes = function(sizeInBytes) {
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switch (sizeInBytes) {
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case 2:
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return IndexDatatype.UNSIGNED_SHORT;
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case 4:
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return IndexDatatype.UNSIGNED_INT;
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case 1:
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return IndexDatatype.UNSIGNED_BYTE;
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//>>includeStart('debug', pragmas.debug);
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default:
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throw new Check.DeveloperError('Size in bytes cannot be mapped to an IndexDatatype');
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//>>includeEnd('debug');
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}
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};
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/**
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* Validates that the provided index datatype is a valid {@link IndexDatatype}.
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*
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* @param {IndexDatatype} indexDatatype The index datatype to validate.
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* @returns {Boolean} <code>true</code> if the provided index datatype is a valid value; otherwise, <code>false</code>.
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*
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* @example
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* if (!Cesium.IndexDatatype.validate(indexDatatype)) {
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* throw new Cesium.DeveloperError('indexDatatype must be a valid value.');
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* }
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*/
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IndexDatatype.validate = function(indexDatatype) {
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return when.defined(indexDatatype) &&
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(indexDatatype === IndexDatatype.UNSIGNED_BYTE ||
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indexDatatype === IndexDatatype.UNSIGNED_SHORT ||
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indexDatatype === IndexDatatype.UNSIGNED_INT);
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};
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/**
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* Creates a typed array that will store indices, using either <code><Uint16Array</code>
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* or <code>Uint32Array</code> depending on the number of vertices.
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*
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* @param {Number} numberOfVertices Number of vertices that the indices will reference.
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* @param {Number|Array} indicesLengthOrArray Passed through to the typed array constructor.
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* @returns {Uint16Array|Uint32Array} A <code>Uint16Array</code> or <code>Uint32Array</code> constructed with <code>indicesLengthOrArray</code>.
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*
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* @example
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* this.indices = Cesium.IndexDatatype.createTypedArray(positions.length / 3, numberOfIndices);
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*/
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IndexDatatype.createTypedArray = function(numberOfVertices, indicesLengthOrArray) {
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//>>includeStart('debug', pragmas.debug);
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if (!when.defined(numberOfVertices)) {
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throw new Check.DeveloperError('numberOfVertices is required.');
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}
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//>>includeEnd('debug');
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if (numberOfVertices >= _Math.CesiumMath.SIXTY_FOUR_KILOBYTES) {
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return new Uint32Array(indicesLengthOrArray);
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}
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return new Uint16Array(indicesLengthOrArray);
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};
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/**
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* Creates a typed array from a source array buffer. The resulting typed array will store indices, using either <code><Uint16Array</code>
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* or <code>Uint32Array</code> depending on the number of vertices.
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*
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* @param {Number} numberOfVertices Number of vertices that the indices will reference.
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* @param {ArrayBuffer} sourceArray Passed through to the typed array constructor.
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* @param {Number} byteOffset Passed through to the typed array constructor.
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* @param {Number} length Passed through to the typed array constructor.
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* @returns {Uint16Array|Uint32Array} A <code>Uint16Array</code> or <code>Uint32Array</code> constructed with <code>sourceArray</code>, <code>byteOffset</code>, and <code>length</code>.
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*
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*/
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IndexDatatype.createTypedArrayFromArrayBuffer = function(numberOfVertices, sourceArray, byteOffset, length) {
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//>>includeStart('debug', pragmas.debug);
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if (!when.defined(numberOfVertices)) {
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throw new Check.DeveloperError('numberOfVertices is required.');
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}
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if (!when.defined(sourceArray)) {
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throw new Check.DeveloperError('sourceArray is required.');
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}
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if (!when.defined(byteOffset)) {
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throw new Check.DeveloperError('byteOffset is required.');
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}
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//>>includeEnd('debug');
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if (numberOfVertices >= _Math.CesiumMath.SIXTY_FOUR_KILOBYTES) {
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return new Uint32Array(sourceArray, byteOffset, length);
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}
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return new Uint16Array(sourceArray, byteOffset, length);
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};
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var IndexDatatype$1 = Object.freeze(IndexDatatype);
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exports.IndexDatatype = IndexDatatype$1;
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});
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