IndexDatatype

Core/IndexDatatype.js 12
Constants for WebGL index datatypes. These corresponds to the type parameter of drawElements.
Properties:
Name Type Description
UNSIGNED_BYTE Number 8-bit unsigned byte corresponding to UNSIGNED_BYTE and the type of an element in Uint8Array.
UNSIGNED_SHORT Number 16-bit unsigned short corresponding to UNSIGNED_SHORT and the type of an element in Uint16Array.
UNSIGNED_INT Number 32-bit unsigned int corresponding to UNSIGNED_INT and the type of an element in Uint32Array.

Members

static constant Cesium.IndexDatatype.UNSIGNED_BYTE : Number
Core/IndexDatatype.js 20

8-bit unsigned byte corresponding to UNSIGNED_BYTE and the type of an element in Uint8Array.
Default Value: WebGLConstants.UNSIGNED_BYTE

static constant Cesium.IndexDatatype.UNSIGNED_INT : Number
Core/IndexDatatype.js 38

32-bit unsigned int corresponding to UNSIGNED_INT and the type of an element in Uint32Array.
Default Value: WebGLConstants.UNSIGNED_INT

static constant Cesium.IndexDatatype.UNSIGNED_SHORT : Number
Core/IndexDatatype.js 29

16-bit unsigned short corresponding to UNSIGNED_SHORT and the type of an element in Uint16Array.
Default Value: WebGLConstants.UNSIGNED_SHORT

Methods

static Cesium.IndexDatatype.createTypedArray(numberOfVertices, indicesLengthOrArray) → Uint16Array|Uint32Array
Core/IndexDatatype.js 122

Creates a typed array that will store indices, using either or Uint32Array depending on the number of vertices.
Name Type Description
numberOfVertices Number Number of vertices that the indices will reference.
indicesLengthOrArray Number | Array Passed through to the typed array constructor.
Returns:
A Uint16Array or Uint32Array constructed with indicesLengthOrArray.
Example:
this.indices = Cesium.IndexDatatype.createTypedArray(positions.length / 3, numberOfIndices);

static Cesium.IndexDatatype.createTypedArrayFromArrayBuffer(numberOfVertices, sourceArray, byteOffset, length) → Uint16Array|Uint32Array
Core/IndexDatatype.js 150

Creates a typed array from a source array buffer. The resulting typed array will store indices, using either or Uint32Array depending on the number of vertices.
Name Type Description
numberOfVertices Number Number of vertices that the indices will reference.
sourceArray ArrayBuffer Passed through to the typed array constructor.
byteOffset Number Passed through to the typed array constructor.
length Number Passed through to the typed array constructor.
Returns:
A Uint16Array or Uint32Array constructed with sourceArray, byteOffset, and length.

static Cesium.IndexDatatype.fromSizeInBytes(sizeInBytes) → IndexDatatype
Core/IndexDatatype.js 74

Gets the datatype with a given size in bytes.
Name Type Description
sizeInBytes Number The size of a single index in bytes.
Returns:
The index datatype with the given size.

static Cesium.IndexDatatype.getSizeInBytes(indexDatatype) → Number
Core/IndexDatatype.js 51

Returns the size, in bytes, of the corresponding datatype.
Name Type Description
indexDatatype IndexDatatype The index datatype to get the size of.
Returns:
The size in bytes.
Example:
// Returns 2
var size = Cesium.IndexDatatype.getSizeInBytes(Cesium.IndexDatatype.UNSIGNED_SHORT);

static Cesium.IndexDatatype.validate(indexDatatype) → Boolean
Core/IndexDatatype.js 102

Validates that the provided index datatype is a valid IndexDatatype.
Name Type Description
indexDatatype IndexDatatype The index datatype to validate.
Returns:
true if the provided index datatype is a valid value; otherwise, false.
Example:
if (!Cesium.IndexDatatype.validate(indexDatatype)) {
  throw new Cesium.DeveloperError('indexDatatype must be a valid value.');
}