From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 22 Oct 2022 15:44:01 +0000 (+0300)
Subject: Adjust component ticking
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgame.git;a=commitdiff_plain;h=86057ab12bea9aaf40be2f1f2a0a3e64e94f0313

Adjust component ticking

Running pre_tick() for all systems before running tick() for any of
them is too inflexible.  Also remove the virtual tick() function from
Component and use a concept for BasicSystem instead.
---

diff --git a/source/game/basicsystem.h b/source/game/basicsystem.h
index 12c2725..aa5d942 100644
--- a/source/game/basicsystem.h
+++ b/source/game/basicsystem.h
@@ -1,52 +1,28 @@
 #ifndef MSP_GAME_BASICSYSTEM_
 #define MSP_GAME_BASICSYSTEM_
 
-#include <msp/time/timedelta.h>
-#include "pool.h"
 #include "stage.h"
 #include "system.h"
 
 namespace Msp::Game {
 
-template<typename T>
-concept HasPreTick = requires(T x) { x.pre_tick(); };
-
 template<typename T>
 concept HasTick = requires(T x) { x.tick(Time::TimeDelta()); };
 
 template<typename T>
-concept HasPostTick = requires(T x) { x.post_tick(); };
-
-template<typename T>
+	requires std::is_base_of_v<Component, T> && HasTick<T>
 class BasicSystem: public System
 {
 public:
 	BasicSystem(Stage &s): System(s) { }
 
-	void pre_tick() override;
 	void tick(Time::TimeDelta) override;
-	void post_tick() override;
 };
 
-template<typename T>
-void BasicSystem<T>::pre_tick()
-{
-	if constexpr(HasPreTick<T>)
-		stage.iterate_objects<T>([](T &obj){ obj.pre_tick(); });
-}
-
 template<typename T>
 void BasicSystem<T>::tick(Time::TimeDelta dt)
 {
-	if constexpr(HasTick<T>)
-		stage.iterate_objects<T>([dt](T &obj){ obj.tick(dt); });
-}
-
-template<typename T>
-void BasicSystem<T>::post_tick()
-{
-	if constexpr(HasPostTick<T>)
-		stage.iterate_objects<T>([](T &obj){ obj.post_tick(); });
+	stage.iterate_objects<T>([dt](T &obj){ obj.tick(dt); });
 }
 
 } // namespace Msp::Game
diff --git a/source/game/component.h b/source/game/component.h
index 6914c15..6b49dd1 100644
--- a/source/game/component.h
+++ b/source/game/component.h
@@ -18,10 +18,6 @@ public:
 	virtual ~Component() = default;
 
 	Handle<Entity> get_entity() const { return entity; }
-
-	virtual void pre_tick() { }
-	virtual void tick(Time::TimeDelta) { }
-	virtual void post_tick() { }
 };
 
 } // namespace Msp::Game
diff --git a/source/game/stage.cpp b/source/game/stage.cpp
index 73eb9a5..8d781f2 100644
--- a/source/game/stage.cpp
+++ b/source/game/stage.cpp
@@ -15,12 +15,8 @@ Stage::~Stage()
 
 void Stage::tick(Time::TimeDelta dt)
 {
-	for(const auto &s: systems)
-		s->pre_tick();
 	for(const auto &s: systems)
 		s->tick(dt);
-	for(const auto &s: systems)
-		s->post_tick();
 }
 
 } // namespace Msp::Game
diff --git a/source/game/system.h b/source/game/system.h
index 88ba291..2d73928 100644
--- a/source/game/system.h
+++ b/source/game/system.h
@@ -16,9 +16,7 @@ protected:
 public:
 	virtual ~System() = default;
 
-	virtual void pre_tick() = 0;
 	virtual void tick(Time::TimeDelta) = 0;
-	virtual void post_tick() = 0;
 };
 
 } // namespace Msp::Game