text: var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
      return new (P || (P = Promise))(function (resolve, reject) {
          function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
          function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
          function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
          step((generator = generator.apply(thisArg, _arguments || [])).next());
      });
  };
  var __generator = (this && this.__generator) || function (thisArg, body) {
      var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
      return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
      function verb(n) { return function (v) { return step([n, v]); }; }
      function step(op) {
          if (f) throw new TypeError("Generator is already executing.");
          while (_) try {
              if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
              if (y = 0, t) op = [op[0] & 2, t.value];
              switch (op[0]) {
                  case 0: case 1: t = op; break;
                  case 4: _.label++; return { value: op[1], done: false };
                  case 5: _.label++; y = op[1]; op = [0]; continue;
                  case 7: op = _.ops.pop(); _.trys.pop(); continue;
                  default:
                      if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                      if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                      if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                      if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                      if (t[2]) _.ops.pop();
                      _.trys.pop(); continue;
              }
              op = body.call(thisArg, _);
          } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
          if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
      }
  };
  var DemoFX = /** @class */ (function () {
      function DemoFX() {
          this.effects = {};
          this.runningEl = null;
          this.running = null;
      }
      DemoFX.prototype.register = function (name, effect) {
          if (this.effects[name] != undefined) {
              throw new Error("Effect '" + name + "' is already registered.");
          }
          this.effects[name] = { effect: effect, ctx: null };
      };
      DemoFX.prototype.loadImage = function (path) {
          return __awaiter(this, void 0, void 0, function () {
              return __generator(this, function (_a) {
                  return [2 /*return*/, new Promise(function (resolve) {
                          var img = document.createElement("img");
                          img.onload = function () {
                              var width = img.width;
                              var height = img.height;
                              var canvas = document.createElement("canvas");
                              canvas.width = width;
                              canvas.height = height;
                              document.body.appendChild(canvas);
                              var ctx = canvas.getContext("2d");
                              if (ctx != null) {
                                  ctx.drawImage(img, 0, 0, width, height);
                                  var pixels = ctx.getImageData(0, 0, width, height);
                                  document.body.removeChild(canvas);
                                  resolve(pixels);
                              }
                          };
                          img.src = path;
                      })];
              });
          });
      };
      DemoFX.prototype.toggle = function (name, el) {
          return __awaiter(this, void 0, void 0, function () {
              var fx, canvas, ctx, render;
              var _this = this;
              return __generator(this, function (_a) {
                  switch (_a.label) {
                      case 0:
                          fx = this.effects[name];
                          if (fx == undefined) {
                              throw new Error("Effect not found: " + name);
                          }
                          if (!(fx.ctx == null)) return [3 /*break*/, 2];
                          canvas = document.getElementById(name);
                          if (canvas == null) {
                              throw new Error("Canvas not found: " + name);
                          }
                          ctx = canvas.getContext("2d");
                          if (ctx == null) {
                              throw new Error("No canvas suppport");
                          }
                          fx.ctx = ctx;
                          return [4 /*yield*/, fx.effect.init(canvas.width, canvas.height)];
                      case 1:
                          _a.sent();
                          _a.label = 2;
                      case 2:
                          // stop previous effect
                          if (this.running != null) {
                              window.cancelAnimationFrame(this.running);
                              this.running = null;
                              if (this.runningEl != null) {
                                  this.runningEl.value = "Run";
                              }
                          }
                          // was previous effect this effect?
                          if (el == this.runningEl) {
                              this.runningEl = null;
                              return [2 /*return*/];
                          }
                          // start new effect
                          el.value = "Pause";
                          this.runningEl = el;
                          render = function (time) {
                              if (fx.ctx != null) {
                                  fx.effect.render(fx.ctx, time);
                                  _this.running = window.requestAnimationFrame(render);
                              }
                              else {
                                  _this.running = null;
                              }
                          };
                          this.running = window.requestAnimationFrame(render);
                          return [2 /*return*/];
                  }
              });
          });
      };
      return DemoFX;
  }());
  var demoFX = new DemoFX();
  function toggle(name, el) {
      return __awaiter(this, void 0, void 0, function () {
          return __generator(this, function (_a) {
              switch (_a.label) {
                  case 0: return [4 /*yield*/, demoFX.toggle(name, el)];
                  case 1:
                      _a.sent();
                      return [2 /*return*/];
              }
          });
      });
  }
  