13 files changed, 164 insertions, 16 deletions
diff --git a/src/crepe/CMakeLists.txt b/src/crepe/CMakeLists.txt
index d7d563e..d85aef0 100644
--- a/src/crepe/CMakeLists.txt
+++ b/src/crepe/CMakeLists.txt
@@ -8,6 +8,8 @@ target_sources(crepe PUBLIC
 	Collider.cpp
 	Rigidbody.cpp
 	Sprite.cpp
+	ScriptSystem.cpp
+	Script.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -22,6 +24,8 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Collider.h
 	Rigidbody.h
 	Sprite.h
+	System.h
+	ScriptSystem.h
 )
 
 add_subdirectory(api)
diff --git a/src/crepe/ComponentManager.hpp b/src/crepe/ComponentManager.hpp
index 999cdcf..084cd33 100644
--- a/src/crepe/ComponentManager.hpp
+++ b/src/crepe/ComponentManager.hpp
@@ -1,13 +1,17 @@
 #pragma once
 
+#include <type_traits>
+
 #include "ComponentManager.h"
 
 namespace crepe {
 
-template <typename T, typename... Args>
+template <class T, typename... Args>
 void ComponentManager::add_component(uint32_t id, Args &&... args) {
 	using namespace std;
 
+	static_assert(is_base_of<Component, T>::value, "add_component must recieve a derivative class of Component");
+
 	// Determine the type of T (this is used as the key of the unordered_map<>)
 	type_index type = typeid(T);
 
@@ -23,9 +27,11 @@ void ComponentManager::add_component(uint32_t id, Args &&... args) {
 		components[type].resize(id + 1);
 	}
 
-	// Create a new component of type T using perfect forwarding and store its
-	// unique_ptr in the vector<>
-	components[type][id].push_back(make_unique<T>(forward<Args>(args)...));
+	// Create a new component of type T (arguments directly forwarded). The
+	// constructor must be called by ComponentManager.
+	T * instance = new T(forward<Args>(args)...);
+	// store its unique_ptr in the vector<>
+	components[type][id].push_back(unique_ptr<T>(instance));
 }
 
 template <typename T>
diff --git a/src/crepe/Script.cpp b/src/crepe/Script.cpp
new file mode 100644
index 0000000..42e3666
--- /dev/null
+++ b/src/crepe/Script.cpp
@@ -0,0 +1,7 @@
+#include "Script.h"
+
+using namespace crepe;
+
+void Script::init() { }
+void Script::update() { }
+
diff --git a/src/crepe/Script.h b/src/crepe/Script.h
new file mode 100644
index 0000000..ba4073a
--- /dev/null
+++ b/src/crepe/Script.h
@@ -0,0 +1,16 @@
+#pragma once
+
+namespace crepe {
+
+class Script {
+protected:
+	virtual void init();
+	virtual void update();
+	// NOTE: additional *events* (like unity's OnDisable and OnEnable) should be
+	// implemented as member methods in derivative user script classes and
+	// registered in init(), otherwise this class will balloon in size with each
+	// added event.
+};
+
+}
+
diff --git a/src/crepe/ScriptSystem.cpp b/src/crepe/ScriptSystem.cpp
new file mode 100644
index 0000000..e301c71
--- /dev/null
+++ b/src/crepe/ScriptSystem.cpp
@@ -0,0 +1,22 @@
+#include "util/log.h"
+
+#include "ScriptSystem.h"
+
+using namespace crepe;
+
+ScriptSystem::ScriptSystem() {
+	dbg_trace();
+}
+ScriptSystem::~ScriptSystem() {
+	dbg_trace();
+}
+
+ScriptSystem & ScriptSystem::get_instance() {
+	static ScriptSystem instance;
+	return instance;
+}
+
+void ScriptSystem::update() {
+	dbg_trace();
+}
+
diff --git a/src/crepe/ScriptSystem.h b/src/crepe/ScriptSystem.h
new file mode 100644
index 0000000..e1ed290
--- /dev/null
+++ b/src/crepe/ScriptSystem.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include "System.h"
+
+namespace crepe {
+
+class ScriptSystem : public System {
+public:
+	static ScriptSystem & get_instance();
+	virtual void update();
+
+private:
+	ScriptSystem();
+	~ScriptSystem();
+};
+
+}
+
diff --git a/src/crepe/System.h b/src/crepe/System.h
new file mode 100644
index 0000000..3fe3d66
--- /dev/null
+++ b/src/crepe/System.h
@@ -0,0 +1,23 @@
+#pragma once
+
+namespace crepe {
+
+class System {
+public:
+	static System & get_instance();
+	virtual void update() = 0;
+
+protected:
+	System() { };
+	virtual ~System() { };
+
+private:
+	// singleton
+	System(const System &) = delete;
+	System(System &&) = delete;
+	System & operator=(const System &) = delete;
+	System & operator=(System &&) = delete;
+};
+
+}
+
diff --git a/src/crepe/api/BehaviorScript.cpp b/src/crepe/api/BehaviorScript.cpp
new file mode 100644
index 0000000..2dd933e
--- /dev/null
+++ b/src/crepe/api/BehaviorScript.cpp
@@ -0,0 +1,10 @@
+#include "../util/log.h"
+
+#include "BehaviorScript.h"
+
+using namespace crepe::api;
+
+BehaviorScript::BehaviorScript() {
+	dbg_trace();
+}
+
diff --git a/src/crepe/api/BehaviorScript.h b/src/crepe/api/BehaviorScript.h
new file mode 100644
index 0000000..e9542c1
--- /dev/null
+++ b/src/crepe/api/BehaviorScript.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include "../Script.h"
+#include "../Component.h"
+
+namespace crepe::api {
+
+class BehaviorScript : public Script, public Component {
+	// only allow ComponentManager to instantiate scripts
+	friend class ComponentManager;
+
+protected:
+	BehaviorScript();
+};
+
+}
+
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index 9548594..86623de 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -1,9 +1,10 @@
 target_sources(crepe PUBLIC
 	# AudioSource.cpp
+	BehaviorScript.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
-	AudioSource.h
-	Component.h
+	# AudioSource.h
+	BehaviorScript.h
 )
 
diff --git a/src/crepe/api/Component.h b/src/crepe/api/Component.h
deleted file mode 100644
index d5e0499..0000000
--- a/src/crepe/api/Component.h
+++ /dev/null
@@ -1,10 +0,0 @@
-#pragma once
-
-namespace crepe::api {
-
-class Component {
-public:
-	bool active;
-};
-
-} // namespace crepe::api
diff --git a/src/example/CMakeLists.txt b/src/example/CMakeLists.txt
index eef38fd..6df4ce7 100644
--- a/src/example/CMakeLists.txt
+++ b/src/example/CMakeLists.txt
@@ -14,4 +14,5 @@ endfunction()
 
 add_example(audio_internal)
 add_example(components_internal)
+add_example(script)
 
diff --git a/src/example/script.cpp b/src/example/script.cpp
new file mode 100644
index 0000000..28605c7
--- /dev/null
+++ b/src/example/script.cpp
@@ -0,0 +1,33 @@
+/** \file
+ * 
+ * Standalone example for usage of the script component and system
+ */
+
+#include <crepe/util/log.h>
+#include <crepe/ScriptSystem.h>
+#include <crepe/ComponentManager.h>
+#include <crepe/GameObject.h>
+
+#include <crepe/api/BehaviorScript.h>
+
+using namespace crepe;
+using namespace std;
+
+class MyScript : public api::BehaviorScript {
+	void update() {
+		dbg_trace();
+	}
+};
+
+int main() {
+	dbg_trace();
+
+	auto obj = GameObject(0, "name", "tag", 0);
+	obj.add_component<MyScript>();
+
+	auto & sys = ScriptSystem::get_instance();
+	sys.update(); // -> MyScript::update
+
+	return 0;
+}
+