Merge remote-tracking branch 'origin/master' into niels/RenderingParticle

1 files changed, 63 insertions, 13 deletions

diff --git a/src/crepe/api/Script.h b/src/crepe/api/Script.h
index 49e625f..2b70379 100644
--- a/src/crepe/api/Script.h
+++ b/src/crepe/api/Script.h
@@ -2,35 +2,85 @@
 
 #include <vector>
 
-namespace crepe {
-class ScriptSystem;
-}
+#include "../types.h"
 
 namespace crepe {
 
+class ScriptSystem;
 class BehaviorScript;
+class ComponentManager;
 
+/**
+ * \brief Script interface
+ *
+ * This class is used as a base class for user-defined scripts that can be added to game
+ * objects using the \c BehaviorScript component.
+ *
+ * \note Additional *events* (like Unity's OnDisable and OnEnable) should be implemented as
+ * member or lambda methods in derivative user script classes and registered in \c init().
+ */
 class Script {
-	friend class crepe::ScriptSystem;
-
 protected:
+	/**
+	 * \brief Script initialization function
+	 *
+	 * This function is called during the ScriptSystem::update() routine *before*
+	 * Script::update() if it (a) has not yet been called and (b) the \c BehaviorScript component
+	 * holding this script instance is active.
+	 */
 	virtual void init() {}
+	/**
+	 * \brief Script update function
+	 *
+	 * This function is called during the ScriptSystem::update() routine if the \c BehaviorScript
+	 * component holding this script instance is active.
+	 */
 	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.
+	//! ScriptSystem calls \c init() and \c update()
+	friend class crepe::ScriptSystem;
 
 protected:
+	/**
+	 * \brief Get single component of type \c T on this game object (utility)
+	 *
+	 * \tparam T Type of component
+	 *
+	 * \returns Reference to component
+	 *
+	 * \throws nullptr if this game object does not have a component matching type \c T
+	 */
 	template <typename T>
-	T & get_component();
+	T & get_component() const;
+	// TODO: make get_component calls for component types that can have more than 1 instance
+	// cause compile-time errors
 
+	/**
+	 * \brief Get all components of type \c T on this game object (utility)
+	 *
+	 * \tparam T Type of component
+	 *
+	 * \returns List of component references
+	 */
 	template <typename T>
-	std::vector<std::reference_wrapper<T>> get_components();
+	std::vector<std::reference_wrapper<T>> get_components() const;
+
+protected:
+	// NOTE: Script must have a constructor without arguments so the game programmer doesn't need
+	// to manually add `using Script::Script` to their concrete script class.
+	Script() = default;
+	//! Only \c BehaviorScript instantiates Script
+	friend class BehaviorScript;
+
+private:
+	// These references are set by BehaviorScript immediately after calling the constructor of
+	// Script.
+	game_object_id_t game_object_id = -1;
+	ComponentManager * component_manager_ref = nullptr;
+	// TODO: use OptionalRef instead of pointer
 
 private:
-	friend class crepe::BehaviorScript;
-	BehaviorScript * parent = nullptr;
+	//! Flag to indicate if \c init() has been called already
+	bool initialized = false;
 };
 
 } // namespace crepe