source/game/director.cpp

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