Merge branch 'feature/33-get-beats-for-killing' into 'develop'

Resolve "Get Beats for Killing"

Closes #33

See merge request !23

src/audio/sound_manager.cpp

@@ -67,7 +67,7 @@ namespace phase_shifter::audio {
 		if(effect != _sound_effects.end()) {
 			auto ctx = _audio.generate_context(effect->second.get_random(_random_gen));
 			ctx.get_object()->set_loops(0);
-			ctx.get_object()->set_volume(_effect_volume * 100);
+			ctx.get_object()->set_volume(static_cast<int>(_effect_volume * 100));
 			ctx.play();
 		}
 	}

src/gameplay/beat_system.cpp

@@ -80,6 +80,11 @@ namespace phase_shifter::gameplay {
 		}
 	}
 
+	void Beat_system::increase_beats_left(int count) {
+		_beat_offset += count;
+		_state.beats_left += count;
+	}
+
 	const std::vector<float>& Beat_system::time_stamps() const { return _time_stamps; }
 
 	int Beat_system::beat_index() const { return _beat_index; }

src/gameplay/beat_system.hpp

@@ -27,6 +27,8 @@ namespace phase_shifter::gameplay {
 
 		void decrease_beats_left(int count);
 
+		void increase_beats_left(int count);
+
 		auto graphic_time_scale() const -> float;
 
 		const std::vector<float>& time_stamps() const ;

src/gameplay/combat_system.cpp

@@ -16,6 +16,7 @@ namespace phase_shifter::gameplay {
 
 	namespace {
 		constexpr auto damage_beat_penalty = 10;
+		constexpr auto kill_beat_gain      = 5;
 	}
 
 	Combat_system::Combat_system(mirrage::util::Message_bus&   bus,
@@ -39,6 +40,9 @@ namespace phase_shifter::gameplay {
 					_ecs.erase(entity);
 			});
 		});
+		_mailbox.subscribe_to([&](Enemy_killed_msg& e) {
+			_beat_system.increase_beats_left(kill_beat_gain);
+		});
 	}
 
 	void Combat_system::update(mirrage::util::Time)