From bce16ed519add0d5398d504d2554395c43c74571 Mon Sep 17 00:00:00 2001
From: Daniel Karbach <daniel.karbach@localhorst.tv>
Date: Fri, 10 Aug 2012 20:13:48 +0200
Subject: [PATCH] added timer facility

---
 src/app/Application.cpp |   5 ++
 src/app/Application.h   |   3 ++
 src/app/State.h         |  10 ++++
 src/app/Timer.h         | 100 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 118 insertions(+)
 create mode 100644 src/app/Timer.h

diff --git a/src/app/Application.cpp b/src/app/Application.cpp
index 29eaee7..fc1d380 100644
--- a/src/app/Application.cpp
+++ b/src/app/Application.cpp
@@ -120,8 +120,12 @@ void Application::Run() {
 void Application::Loop() {
 	Uint32 now(SDL_GetTicks());
 	Uint32 deltaT(now - last);
+	GlobalTimers().Update(deltaT);
 	if (deltaT > 34) deltaT = 34;
 
+	if (CurrentState()) {
+		CurrentState()->GraphicsTimers().Update(deltaT);
+	}
 	HandleEvents();
 	if (!StateChangePending()) {
 		UpdateWorld(deltaT);
@@ -161,6 +165,7 @@ void Application::HandleEvents() {
 void Application::UpdateWorld(Uint32 deltaT) {
 	if (!CurrentState()) return;
 	for (Uint32 i(0); i < deltaT; ++i) {
+		CurrentState()->PhysicsTimers().Update(0.001f);
 		CurrentState()->UpdateWorld(0.001f);
 	}
 }
diff --git a/src/app/Application.h b/src/app/Application.h
index 5e9e888..cf1261b 100644
--- a/src/app/Application.h
+++ b/src/app/Application.h
@@ -9,6 +9,7 @@
 #define APP_APPLICATION_H_
 
 #include "Input.h"
+#include "Timer.h"
 #include "../sdl/InitScreen.h"
 
 #include <stack>
@@ -40,6 +41,7 @@ public:
 	void Quit();
 	Input &Buttons() { return input; }
 	const Input &Buttons() const { return input; }
+	Timers<Uint32> &GlobalTimers() { return globalTimers; }
 
 private:
 	struct StateCommand {
@@ -67,6 +69,7 @@ private:
 	sdl::InitScreen *screen;
 	std::stack<State *> states;
 	std::queue<StateCommand> stateChanges;
+	Timers<Uint32> globalTimers;
 	Input input;
 	Uint32 last;
 
diff --git a/src/app/State.h b/src/app/State.h
index 678f2b9..b4c26d0 100644
--- a/src/app/State.h
+++ b/src/app/State.h
@@ -8,6 +8,8 @@
 #ifndef APP_APPLICATIONSTATE_H_
 #define APP_APPLICATIONSTATE_H_
 
+#include "Timer.h"
+
 #include <SDL.h>
 
 namespace app {
@@ -40,6 +42,14 @@ public:
 	virtual void UpdateWorld(float deltaT) = 0;
 	virtual void Render(SDL_Surface *) = 0;
 
+public:
+	Timers<Uint32> &GraphicsTimers() { return graphicsTimers; }
+	Timers<float> &PhysicsTimers() { return physicsTimers; }
+
+private:
+	Timers<Uint32> graphicsTimers;
+	Timers<float> physicsTimers;
+
 };
 
 }
diff --git a/src/app/Timer.h b/src/app/Timer.h
new file mode 100644
index 0000000..465ed64
--- /dev/null
+++ b/src/app/Timer.h
@@ -0,0 +1,100 @@
+/*
+ * Timer.h
+ *
+ *  Created on: Aug 10, 2012
+ *      Author: holy
+ */
+
+#ifndef APP_TIMER_H_
+#define APP_TIMER_H_
+
+#include <algorithm>
+#include <list>
+
+namespace app {
+
+template<class Time>
+struct TimerData {
+
+	TimerData() : time(0), target(0), refCount(0) { }
+	TimerData(Time target) : time(0), target(target), refCount(0) { }
+
+	Time time;
+	Time target;
+	int refCount;
+
+};
+
+
+template<class Time>
+class Timer {
+
+public:
+	Timer() : data(0) { }
+	~Timer() { if (data) --data->refCount; }
+	Timer(TimerData<Time> *data) : data(data) { ++data->refCount; }
+	Timer(const Timer<Time> &other)
+	: data(other.data) { if (data) ++(data->refCount); }
+	Timer<Time> &operator =(const Timer<Time> &other) {
+		Timer<Time> temp(other);
+		Swap(temp);
+		return *this;
+	}
+	void Swap(Timer<Time> &other) {
+		std::swap(data, other.data);
+	}
+
+public:
+	bool Running() const {
+		return data;
+	}
+	bool Finished() const {
+		return data ? data->time >= data->target : false;
+	}
+	Time Elapsed() const {
+		return data ? data->time : Time();
+	}
+	Time Remaining() const {
+		return data ? (data->target - data->time) : Time();
+	}
+
+private:
+	TimerData<Time> *data;
+
+};
+
+
+template<class Time>
+class Timers {
+
+public:
+	Timers() { }
+
+public:
+	void Update(Time delta) {
+		for (typename std::list<TimerData<Time> >::iterator i(data.begin()), end(data.end()); i != end;) {
+			i->time += delta;
+			if (i->refCount <= 0) {
+				i = data.erase(i);
+			} else {
+				++i;
+			}
+		}
+	}
+	Timer<Time> StartTimer() {
+		data.push_back(TimerData<Time>());
+		return Timer<Time>(&data.back());
+	}
+	Timer<Time> StartCountdown(Time duration) {
+		data.push_back(TimerData<Time>(duration));
+		return Timer<Time>(&data.back());
+	}
+
+private:
+	std::list<TimerData<Time> > data;
+
+};
+
+}
+
+#endif /* APP_TIMER_H_ */
-- 
2.39.2