source/game/stage.cpp

   1 #include "stage.h"
   2 #include "camera.h"
   3 #include "root.h"
   4 #include "system.h"
   5
   6 using namespace std;
   7
   8 namespace Msp::Game {
   9
  10 Stage::Stage(DataFile::Collection &r):
  11         resources(r),
  12         event_source(event_bus),
  13         event_observer(event_bus),
  14         root(std::make_unique<Root>(*this))
  15 {
  16         event_observer.observe<Events::ComponentCreated>([this](auto &e){
  17                 if(!active_camera)
  18                         if(Handle<Camera> camera = dynamic_handle_cast<Camera>(e.component))
  19                                 set_active_camera(camera);
  20         });
  21 }
  22
  23 // Hide unique_ptr destructors from the header
  24 Stage::~Stage()
  25 { }
  26
  27 void Stage::remove_system(System &s)
  28 {
  29         erase_if(systems, [&s](auto &p){ return p.get()==&s; });
  30 }
  31
  32 void Stage::set_active_camera(Handle<Camera> c)
  33 {
  34         active_camera = c;
  35         event_source.emit<Events::CameraChanged>(active_camera);
  36 }
  37
  38 void Stage::synthesize_initial_events(EventObserver &target_observer)
  39 {
  40         synthesize_initial_events(Handle<Entity>::from_object(root.get()), target_observer);
  41         if(active_camera)
  42                 event_source.emit_to<Events::CameraChanged>(target_observer, active_camera);
  43 }
  44
  45 void Stage::synthesize_initial_events(Handle<Entity> entity, EventObserver &target_observer)
  46 {
  47         for(Handle<Component> c: entity->get_components())
  48                 event_source.emit_to<Events::ComponentCreated>(target_observer, c);
  49         for(Handle<Entity> e: entity->get_children())
  50                 synthesize_initial_events(e, target_observer);
  51         event_source.emit_to<Events::EntityCreated>(target_observer, entity);
  52 }
  53
  54 void Stage::tick(Time::TimeDelta dt)
  55 {
  56         for(const auto &s: systems)
  57                 s->tick(dt);
  58         for(const auto &s: systems)
  59                 s->deferred_tick();
  60 }
  61
  62 } // namespace Msp::Game