class FX {
  //img in and out
  Shader shader;
  String[] params; // IS THIS NECESSARY? I DOUBT IT
  FX(Shader shader_) {
    shader = shader_;
  }
}

FXManager fxManager = new FXManager();

class FXManager {
  ArrayList<FX> fxList = new ArrayList<FX>();

  void addFx(Shader shader) {
    this.fxList.add(new FX(shader));
    println("Added " + shader + " to fxList at spot. List length: " + this.fxList.size());
  }

  void addFx(Shader shader, int pos) {
    fxList.add(new FX(shader));
    swapFx(this.fxList.size(), pos);
    println("Added " + shader + " to fxList at spot. List length: " + this.fxList.size());
  }


  void swapFx(int pos1, int pos2) {
    if (pos1 >= 0 && pos2 < this.fxList.size()) Collections.swap(fxList, pos1, pos2);
  }

  void removeFx(int pos) {
    if (pos >= 0 && this.fxList.size() > pos) this.fxList.remove(pos);
  }

  void run(boolean animate, boolean apply) {
    for (int i = 0; i < fxManager.fxList.size(); i++) {
      if (animate) {
        for (int j = 0; j < this.fxList.get(i).shader.params.size(); j++) {
          if (this.fxList.get(i).shader.params.get(j).animating) {
            this.fxList.get(i).shader.params.get(j).animate();
          }
        }
      }
      if (apply) this.fxList.get(i).shader.apply();
      if (i > maxFx) break;
    }
  }
}