source/game/director.cpp

   1 #include "director.h"
   2 #include <stdexcept>
   3 #include <msp/time/utils.h>
   4 #include "component.h"
   5 #include "entity.h"
   6 #include "stage.h"
   7
   8 using namespace std;
   9
  10 namespace Msp::Game {
  11
  12 Director::Director(DataFile::Collection &r):
  13         resources(r),
  14         event_source(event_bus)
  15 {
  16 #if DEBUG
  17         access_guard.emplace();
  18 #endif
  19
  20         reflector.get_or_create_class<Entity>().set_polymorphic_base<Entity>();
  21         reflector.get_or_create_class<Component>().set_polymorphic_base<Component>();
  22 }
  23
  24 // Hide ~unique_ptr<Stage> from the header
  25 Director::~Director()
  26 { }
  27
  28 Stage &Director::create_stage()
  29 {
  30         stages.emplace_back(std::make_unique<Stage>(std::ref(reflector), std::ref(resources)));
  31         event_source.emit<Events::StageCreated>(std::ref(*stages.back()));
  32         return *stages.back();
  33 }
  34
  35 void Director::activate_stage(Stage &s)
  36 {
  37         if(active_stage)
  38                 event_source.emit<Events::StageDeactivated>(std::ref(s));
  39         active_stage = &s;
  40         event_source.emit<Events::StageActivated>(std::ref(s));
  41 }
  42
  43 void Director::tick()
  44 {
  45         Time::TimeStamp now = Time::now();
  46         Time::TimeDelta dt = (last_tick ? now-last_tick : Time::zero);
  47         last_tick = now;
  48
  49         backlog = min(backlog+dt, stepsize*max_backlog_steps);
  50         for(unsigned i=0; (i<max_steps_per_frame && backlog>=stepsize); ++i, backlog-=stepsize)
  51                 for(const auto &s: stages)
  52                         s->tick(stepsize);
  53 }
  54
  55 } // namespace Msp::Game