@openhps/core/src/three/renderers/webgl-fallback/utils/WebGLExtensions.js

Open Hybrid Positioning System - Core component

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
/**
 * 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);
  }
}
var _default = exports.default = WebGLExtensions;