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():
  11         event_source(event_bus)
  12 { }
  13
  14 Stage &Director::create_stage()
  15 {
  16         stages.emplace_back(std::make_unique<Stage>());
  17         event_source.emit<Events::StageCreated>(std::ref(*stages.back()));
  18         return *stages.back();
  19 }
  20
  21 void Director::activate_stage(Stage &s)
  22 {
  23         if(active_stage)
  24                 event_source.emit<Events::StageDeactivated>(std::ref(s));
  25         active_stage = &s;
  26         event_source.emit<Events::StageActivated>(std::ref(s));
  27 }
  28
  29 void Director::tick()
  30 {
  31         Time::TimeStamp now = Time::now();
  32         Time::TimeDelta dt = (last_tick ? now-last_tick : Time::zero);
  33         last_tick = now;
  34
  35         backlog = min(backlog+dt, stepsize*max_backlog_steps);
  36         for(unsigned i=0; (i<max_steps_per_frame && backlog>=stepsize); ++i, backlog-=stepsize)
  37                 for(const auto &s: stages)
  38                         s->tick(stepsize);
  39 }
  40
  41 } // namespace Msp::Game