Function glFunctionArgToString

docs/tests/v2/es6/js/sanddance.js:34523–34559

* Returns the string version of a WebGL argument. * Attempts to convert enum arguments to strings. * @param {string} functionName the name of the WebGL function. * @param {number} numArgs the number of arguments passed to the function. * @param {number} argumentIndx the index of the argument. *

(functionName, numArgs, argumentIndex, value)

 * @return {string} The value as a string.
 */
function glFunctionArgToString(functionName, numArgs, argumentIndex, value) {
  var funcInfo = glValidEnumContexts[functionName];
  if (funcInfo !== undefined) {
    var funcInfo = funcInfo[numArgs];
    if (funcInfo !== undefined) {
      if (funcInfo[argumentIndex]) {
        if (typeof funcInfo[argumentIndex] === 'object' &&
            funcInfo[argumentIndex]['enumBitwiseOr'] !== undefined) {
          var enums = funcInfo[argumentIndex]['enumBitwiseOr'];
          var orResult = 0;
          var orEnums = [];
          for (var i = 0; i < enums.length; ++i) {
            var enumValue = enumStringToValue[enums[i]];
            if ((value & enumValue) !== 0) {
              orResult |= enumValue;
              orEnums.push(glEnumToString(enumValue));
            }
          }
          if (orResult === value) {
            return orEnums.join(' | ');
          } else {
            return glEnumToString(value);
          }
        } else {
          return glEnumToString(value);
        }
      }
    }
  }
  if (value === null) {
    return "null";
  } else if (value === undefined) {
    return "undefined";
  } else {
    return value.toString();
  }
}

/**
 * Converts the arguments of a WebGL function to a string.