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