nes-emu/apu/synthesis/LinearLengthCounter.js

A NES emulator

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _LengthCounter = _interopRequireDefault(require("./LengthCounter"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
function ownKeys(e, r) { var t = Object.keys(e); if (Object.getOwnPropertySymbols) { var o = Object.getOwnPropertySymbols(e); r && (o = o.filter(function (r) { return Object.getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? ownKeys(Object(t), !0).forEach(function (r) { _defineProperty(e, r, t[r]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(e, Object.getOwnPropertyDescriptors(t)) : ownKeys(Object(t)).forEach(function (r) { Object.defineProperty(e, r, Object.getOwnPropertyDescriptor(t, r)); }); } return e; }
function _defineProperty(e, r, t) { return (r = _toPropertyKey(r)) in e ? Object.defineProperty(e, r, { value: t, enumerable: !0, configurable: !0, writable: !0 }) : e[r] = t, e; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == typeof i ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != typeof t || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != typeof i) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
/** A length counter that postpones changes until the next quarter beat. */
class LinearLengthCounter extends _LengthCounter.default {
  constructor() {
    super();
    this.reload = 0;
    this.reloadFlag = false;
  }

  /**
   * Sets the counter with the reload value or clocks the length counter as normal.
   * Unless `isHalted`, the reload flag is cleared.
   */
  clock(isEnabled, isHalted) {
    if (!isEnabled) {
      this.counter = 0;
      return;
    }
    if (this.reloadFlag) this.counter = this.reload;else super.clock(isEnabled, false);
    if (!isHalted) this.reloadFlag = false;
  }

  /** Returns a snapshot of the current state. */
  getSaveState() {
    return _objectSpread(_objectSpread({}, super.getSaveState()), {}, {
      reload: this.reload,
      reloadFlag: this.reloadFlag
    });
  }

  /** Restores state from a snapshot. */
  setSaveState(saveState) {
    super.setSaveState(saveState);
    this.reload = saveState.reload;
    this.reloadFlag = saveState.reloadFlag;
  }
}
exports.default = LinearLengthCounter;