helper.js

/*
 * Copyright 2019 Gregg Tavares
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

/* eslint no-console: "off" */

/**
 * Copy named properties
 *
 * @param {string[]} names names of properties to copy
 * @param {object} src object to copy properties from
 * @param {object} dst object to copy properties to
 * @private
 */
function copyNamedProperties(names, src, dst) {
  names.forEach(function(name) {
    const value = src[name];
    if (value !== undefined) {
      dst[name] = value;
    }
  });
}

/**
 * Copies properties from source to dest only if a matching key is in dest
 *
 * @param {Object.<string, ?>} src the source
 * @param {Object.<string, ?>} dst the dest
 * @private
 */
function copyExistingProperties(src, dst) {
  Object.keys(dst).forEach(function(key) {
    if (dst.hasOwnProperty(key) && src.hasOwnProperty(key)) {  /* eslint no-prototype-builtins: 0 */
      dst[key] = src[key];
    }
  });
}

function error(...args) {
  console.error(...args);
}

function warn(...args) {
  console.warn(...args);
}

const isTypeWeakMaps = new Map();

function isType(object, type) {
  if (!object || typeof object !== 'object') {
    return false;
  }
  let weakMap = isTypeWeakMaps.get(type);
  if (!weakMap) {
    weakMap = new WeakMap();
    isTypeWeakMaps.set(type, weakMap);
  }
  let isOfType = weakMap.get(object);
  if (isOfType === undefined) {
    const s = Object.prototype.toString.call(object);
    isOfType = s.substring(8, s.length - 1) === type;
    weakMap.set(object, isOfType);
  }
  return isOfType;
}

function isBuffer(gl, t) {
  return typeof WebGLBuffer !== 'undefined' && isType(t, 'WebGLBuffer');
}

function isRenderbuffer(gl, t) {
  return typeof WebGLRenderbuffer !== 'undefined' && isType(t, 'WebGLRenderbuffer');
}

function isShader(gl, t) {
  return typeof WebGLShader !== 'undefined' && isType(t, 'WebGLShader');
}

function isTexture(gl, t) {
  return typeof WebGLTexture !== 'undefined' && isType(t, 'WebGLTexture');
}

function isSampler(gl, t) {
  return typeof WebGLSampler !== 'undefined' && isType(t, 'WebGLSampler');
}

export {
  copyExistingProperties,
  copyNamedProperties,
  error,
  warn,
  isBuffer,
  isRenderbuffer,
  isShader,
  isTexture,
  isSampler,
};