From f90804b7a1042a1266cbe3075631e4fcc18b9a8a Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 26 Oct 2022 00:16:04 +0300
Subject: [PATCH] Add stage activation and events

---
 source/game/director.cpp | 13 +++++++++++++
 source/game/director.h   | 11 +++++++++++
 source/game/events.h     | 16 ++++++++++++++++
 3 files changed, 40 insertions(+)

diff --git a/source/game/director.cpp b/source/game/director.cpp
index 741965b..28d86e7 100644
--- a/source/game/director.cpp
+++ b/source/game/director.cpp
@@ -7,12 +7,25 @@ using namespace std;
 
 namespace Msp::Game {
 
+Director::Director():
+	event_source(event_bus)
+{ }
+
 Stage &Director::create_stage()
 {
 	stages.emplace_back(std::make_unique<Stage>());
+	event_source.emit<Events::StageCreated>(std::ref(*stages.back()));
 	return *stages.back();
 }
 
+void Director::activate_stage(Stage &s)
+{
+	if(active_stage)
+		event_source.emit<Events::StageDeactivated>(std::ref(s));
+	active_stage = &s;
+	event_source.emit<Events::StageActivated>(std::ref(s));
+}
+
 void Director::tick()
 {
 	Time::TimeStamp now = Time::now();
diff --git a/source/game/director.h b/source/game/director.h
index 24ef634..9d221b0 100644
--- a/source/game/director.h
+++ b/source/game/director.h
@@ -5,6 +5,9 @@
 #include <vector>
 #include <msp/time/timedelta.h>
 #include <msp/time/timestamp.h>
+#include "eventbus.h"
+#include "events.h"
+#include "eventsource.h"
 
 namespace Msp::Game {
 
@@ -12,8 +15,14 @@ class Stage;
 
 class Director
 {
+public:
+	using EventSource = Game::EventSource<Events::StageCreated, Events::StageActivated, Events::StageDeactivated>;
+
 private:
+	EventBus event_bus;
+	EventSource event_source;
 	std::vector<std::unique_ptr<Stage>> stages;
+	Stage *active_stage = nullptr;
 	Time::TimeStamp last_tick;
 	Time::TimeDelta stepsize = Time::sec/60;
 	Time::TimeDelta backlog;
@@ -21,7 +30,9 @@ private:
 	unsigned max_backlog_steps = 600;
 
 public:
+	Director();
 	Stage &create_stage();
+	void activate_stage(Stage &);
 
 	void tick();
 };
diff --git a/source/game/events.h b/source/game/events.h
index 15988e5..98a6ff0 100644
--- a/source/game/events.h
+++ b/source/game/events.h
@@ -7,6 +7,7 @@ namespace Msp::Game {
 
 class Component;
 class Entity;
+class Stage;
 
 namespace Events {
 
@@ -30,6 +31,21 @@ struct ComponentDestroyed
 	Handle<Component> component;
 };
 
+struct StageCreated
+{
+	Stage &stage;
+};
+
+struct StageActivated
+{
+	Stage &stage;
+};
+
+struct StageDeactivated
+{
+	Stage &stage;
+};
+
 } // namespace Events
 } // namespace Msp::Game
 
-- 
2.43.0