WebGLExtensions.js•1.54 kB
/**
* A WebGL 2 backend utility module for managing extensions.
*
* @private
*/
class WebGLExtensions {
/**
* Constructs a new utility object.
*
* @param {WebGLBackend} backend - The WebGL 2 backend.
*/
constructor( backend ) {
/**
* A reference to the WebGL 2 backend.
*
* @type {WebGLBackend}
*/
this.backend = backend;
/**
* A reference to the rendering context.
*
* @type {WebGL2RenderingContext}
*/
this.gl = this.backend.gl;
/**
* A list with all the supported WebGL extensions.
*
* @type {Array<String>}
*/
this.availableExtensions = this.gl.getSupportedExtensions();
/**
* A dictionary with requested WebGL extensions.
* The key is the name of the extension, the value
* the requested extension object.
*
* @type {Object<String,Object>}
*/
this.extensions = {};
}
/**
* Returns the extension object for the given extension name.
*
* @param {String} name - The extension name.
* @return {Object} The extension object.
*/
get( name ) {
let extension = this.extensions[ name ];
if ( extension === undefined ) {
extension = this.gl.getExtension( name );
this.extensions[ name ] = extension;
}
return extension;
}
/**
* Returns `true` if the requested extension is available.
*
* @param {String} name - The extension name.
* @return {Boolean} Whether the given extension is available or not.
*/
has( name ) {
return this.availableExtensions.includes( name );
}
}
export default WebGLExtensions;