@openhps/core/src/three/renderers/webgl-fallback/utils/WebGLCapabilities.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 the device's capabilities.
 *
 * @private
 */
class WebGLCapabilities {
  /**
   * 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;

    /**
     * This value holds the cached max anisotropy value.
     *
     * @type {?number}
     * @default null
     */
    this.maxAnisotropy = null;
  }

  /**
   * Returns the maximum anisotropy texture filtering value. This value
   * depends on the device and is reported by the `EXT_texture_filter_anisotropic`
   * WebGL extension.
   *
   * @return {number} The maximum anisotropy texture filtering value.
   */
  getMaxAnisotropy() {
    if (this.maxAnisotropy !== null) return this.maxAnisotropy;
    const gl = this.backend.gl;
    const extensions = this.backend.extensions;
    if (extensions.has('EXT_texture_filter_anisotropic') === true) {
      const extension = extensions.get('EXT_texture_filter_anisotropic');
      this.maxAnisotropy = gl.getParameter(extension.MAX_TEXTURE_MAX_ANISOTROPY_EXT);
    } else {
      this.maxAnisotropy = 0;
    }
    return this.maxAnisotropy;
  }
}
var _default = exports.default = WebGLCapabilities;