demo-controller.cpp

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/*
  DemoController  -  playback controller object
 
   Copyright (C)
     2008,            Joel Holdsworth <joel@airwebreathe.org.uk>
     2025,            Hermann Vosseler <Ichthyostega@web.de>
 
 **Lumiera** is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License as published by the
 Free Software Foundation; either version 2 of the License, or (at your
 option) any later version. See the file COPYING for further details.
 
* *****************************************************************/
 
 
#include "stage/ctrl/demo-controller.hpp"
#include "steam/engine/worker/dummy-tick-service.hpp"
#include "steam/engine/worker/dummy-image-generator.hpp"
 
#include <utility>
 
 
namespace stage {
namespace ctrl {
  namespace error = lumiera::error;
 
  namespace {
    const uint FPS = 4;
  }
  
  using std::make_unique;
  using steam::node::DummyTickService;
  using steam::node::DummyImageGenerator;
  using lumiera::DisplayerInput;
  
  
  DemoController::DemoController()
    : imageGen_{make_unique<DummyImageGenerator>(FPS)}
    , tick_{}
    , output_{}
    , playing_{false}
    { }
  
  DemoController::~DemoController() { stop(); }
  
  void
  DemoController::activate (lumiera::DisplayerInput displayFormat)
  {
    REQUIRE (imageGen_);
    imageGen_->configure (displayFormat);
  }
  
  void
  DemoController::processFrame()
  {
    REQUIRE (tick_);
    REQUIRE (imageGen_);
    
    if (playing_)
      output_(imageGen_->next());
    else
      output_(imageGen_->current());
  }
  
  
  void
  DemoController::play()
  {
    if (not tick_)
        tick_.reset (new DummyTickService{[this]{ processFrame(); }});
    ASSERT (tick_);
    tick_->activate (FPS);
    playing_ = true;
  }
  
  void
  DemoController::pause()
  {
    if (tick_)
      tick_->activate(0);
    playing_ = false;
  }
  
  void
  DemoController::stop()
  {
    tick_.reset(); // blocks for one cycle to join()
    playing_ = false;
  }
  
  
}} // namespace stage::ctrl