Add '/clearobjects quick'

src/environment.h

@@ -203,6 +203,18 @@ public:
 private:
 };
 
+/*
+	Operation mode for ServerEnvironment::clearObjects()
+*/
+enum ClearObjectsMode {
+	// Load and go through every mapblock, clearing objects
+	CLEAR_OBJECTS_MODE_FULL,
+
+	// Clear objects immediately in loaded mapblocks;
+	// clear objects in unloaded mapblocks only when the mapblocks are next activated.
+	CLEAR_OBJECTS_MODE_QUICK,
+};
+
 /*
 	The server-side environment.
 
@@ -319,8 +331,8 @@ public:
 	// Find all active objects inside a radius around a point
 	void getObjectsInsideRadius(std::vector<u16> &objects, v3f pos, float radius);
 
-	// Clear all objects, loading and going through every MapBlock
-	void clearAllObjects();
+	// Clear objects, loading and going through every MapBlock
+	void clearObjects(ClearObjectsMode mode);
 
 	// This makes stuff happen
 	void step(f32 dtime);
@@ -410,6 +422,10 @@ private:
 	u32 m_game_time;
 	// A helper variable for incrementing the latter
 	float m_game_time_fraction_counter;
+	// Time of last clearObjects call (game time).
+	// When a mapblock older than this is loaded, its objects are cleared.
+	u32 m_last_clear_objects_time;
+	// Active block modifiers
 	std::vector<ABMWithState> m_abms;
 	// An interval for generally sending object positions and stuff
 	float m_recommended_send_interval;