16 files changed, 677 insertions, 87 deletions

diff --git a/MCServer/Plugins/Core b/MCServer/Plugins/Core
-Subproject 4183d6cfb2049d0757d811a65bd4e75ed78b9f4
+Subproject 39d980e3a3447ac23f61c7d65426b33ee6c0718
diff --git a/MCServer/Plugins/Debuggers/Debuggers.lua b/MCServer/Plugins/Debuggers/Debuggers.lua
index 3dcd4ebee..a047488b5 100644
--- a/MCServer/Plugins/Debuggers/Debuggers.lua
+++ b/MCServer/Plugins/Debuggers/Debuggers.lua
@@ -35,39 +35,15 @@ function Initialize(Plugin)
 	-- _X: Disabled so that the normal operation doesn't interfere with anything
 	-- PM:AddHook(cPluginManager.HOOK_CHUNK_GENERATED,              OnChunkGenerated);
 
-	PM:BindCommand("/nick",    "debuggers", HandleNickCmd,         "- Gives you a custom name");
-	PM:BindCommand("/le",      "debuggers", HandleListEntitiesCmd, "- Shows a list of all the loaded entities");
-	PM:BindCommand("/ke",      "debuggers", HandleKillEntitiesCmd, "- Kills all the loaded entities");
-	PM:BindCommand("/wool",    "debuggers", HandleWoolCmd,         "- Sets all your armor to blue wool");
-	PM:BindCommand("/testwnd", "debuggers", HandleTestWndCmd,      "- Opens up a window using plugin API");
-	PM:BindCommand("/gc",      "debuggers", HandleGCCmd,           "- Activates the Lua garbage collector");
-	PM:BindCommand("/fast",    "debuggers", HandleFastCmd,         "- Switches between fast and normal movement speed");
-	PM:BindCommand("/dash",    "debuggers", HandleDashCmd,         "- Switches between fast and normal sprinting speed");
-	PM:BindCommand("/hunger",  "debuggers", HandleHungerCmd,       "- Lists the current hunger-related variables");
-	PM:BindCommand("/poison",  "debuggers", HandlePoisonCmd,       "- Sets food-poisoning for 15 seconds");
-	PM:BindCommand("/starve",  "debuggers", HandleStarveCmd,       "- Sets the food level to zero");
-	PM:BindCommand("/fl",      "debuggers", HandleFoodLevelCmd,    "- Sets the food level to the given value");
-	PM:BindCommand("/spidey",  "debuggers", HandleSpideyCmd,       "- Shoots a line of web blocks until it hits non-air");
-	PM:BindCommand("/ench",    "debuggers", HandleEnchCmd,         "- Provides an instant dummy enchantment window");
-	PM:BindCommand("/fs",      "debuggers", HandleFoodStatsCmd,    "- Turns regular foodstats message on or off");
-	PM:BindCommand("/arr",     "debuggers", HandleArrowCmd,        "- Creates an arrow going away from the player");
-	PM:BindCommand("/fb",      "debuggers", HandleFireballCmd,     "- Creates a ghast fireball as if shot by the player");
-	PM:BindCommand("/xpa",     "debuggers", HandleAddExperience,   "- Adds 200 experience to the player");
-	PM:BindCommand("/xpr",     "debuggers", HandleRemoveXp,        "- Remove all xp");
-	PM:BindCommand("/fill",    "debuggers", HandleFill,            "- Fills all block entities in current chunk with junk");
-	PM:BindCommand("/fr",      "debuggers", HandleFurnaceRecipe,   "- Shows the furnace recipe for the currently held item");
-	PM:BindCommand("/ff",      "debuggers", HandleFurnaceFuel,     "- Shows how long the currently held item would burn in a furnace");
-	PM:BindCommand("/sched",   "debuggers", HandleSched,           "- Schedules a simple countdown using cWorld:ScheduleTask()");
-	PM:BindCommand("/cs",      "debuggers", HandleChunkStay,       "- Tests the ChunkStay Lua integration for the specified chunk coords");
-	PM:BindCommand("/compo",   "debuggers", HandleCompo,           "- Tests the cCompositeChat bindings");
-	PM:BindCommand("/sb",      "debuggers", HandleSetBiome,        "- Sets the biome around you to the specified one");
-	PM:BindCommand("/wesel",   "debuggers", HandleWESel,           "- Expands the current WE selection by 1 block in X/Z");
-	PM:BindCommand("/rmitem",  "debuggers", HandleRMItem,          "- Remove the specified item from the inventory.");
-	PM:BindCommand("/pickups", "debuggers", HandlePickups,         "- Spawns random pickups around you");
-	PM:BindCommand("/poof",    "debuggers", HandlePoof,            "- Nudges pickups close to you away from you");
-	
-	PM:BindConsoleCommand("sched", HandleConsoleSchedule, "Tests the world scheduling");
-
+	-- Load the InfoReg shared library:
+	dofile(cPluginManager:GetPluginsPath() .. "/InfoReg.lua")
+	
+	-- Bind all the commands:
+	RegisterPluginInfoCommands();
+	
+	-- Bind all the console commands:
+	RegisterPluginInfoConsoleCommands();
+	
 	Plugin:AddWebTab("Debuggers",  HandleRequest_Debuggers)
 	Plugin:AddWebTab("StressTest", HandleRequest_StressTest)
 
@@ -1643,3 +1619,85 @@ end
 
 
 
+
+function HandleConsoleLoadChunk(a_Split)
+	-- Check params:
+	local numParams = #a_Split
+	if (numParams ~= 3) and (numParams ~= 4) then
+		return true, "Usage: " .. a_Split[1] .. " <ChunkX> <ChunkZ> [<WorldName>]"
+	end
+	
+	-- Get the chunk coords:
+	local chunkX = tonumber(a_Split[2])
+	if (chunkX == nil) then
+		return true, "Not a number: '" .. a_Split[2] .. "'"
+	end
+	local chunkZ = tonumber(a_Split[3])
+	if (chunkZ == nil) then
+		return true, "Not a number: '" .. a_Split[3] .. "'"
+	end
+
+	-- Get the world:
+	local world
+	if (a_Split[4] == nil) then
+		world = cRoot:Get():GetDefaultWorld()
+	else
+		world = cRoot:Get():GetWorld(a_Split[4])
+		if (world == nil) then
+			return true, "There's no world named '" .. a_Split[4] .. "'."
+		end
+	end
+	
+	-- Queue a ChunkStay for the chunk, log a message when the chunk is loaded:
+	world:ChunkStay({{chunkX, chunkZ}}, nil,
+		function()
+			LOG("Chunk [" .. chunkX .. ", " .. chunkZ .. "] is loaded")
+		end
+	)
+	return true
+end
+
+
+
+
+
+function HandleConsolePrepareChunk(a_Split)
+	-- Check params:
+	local numParams = #a_Split
+	if (numParams ~= 3) and (numParams ~= 4) then
+		return true, "Usage: " .. a_Split[1] .. " <ChunkX> <ChunkZ> [<WorldName>]"
+	end
+	
+	-- Get the chunk coords:
+	local chunkX = tonumber(a_Split[2])
+	if (chunkX == nil) then
+		return true, "Not a number: '" .. a_Split[2] .. "'"
+	end
+	local chunkZ = tonumber(a_Split[3])
+	if (chunkZ == nil) then
+		return true, "Not a number: '" .. a_Split[3] .. "'"
+	end
+
+	-- Get the world:
+	local world
+	if (a_Split[4] == nil) then
+		world = cRoot:Get():GetDefaultWorld()
+	else
+		world = cRoot:Get():GetWorld(a_Split[4])
+		if (world == nil) then
+			return true, "There's no world named '" .. a_Split[4] .. "'."
+		end
+	end
+	
+	-- Queue the chunk for preparing, log a message when prepared:
+	world:PrepareChunk(chunkX, chunkZ,
+		function(a_CBChunkX, a_CBChunkZ)
+			LOG("Chunk [" .. chunkX .. ", " .. chunkZ .. "] has been prepared")
+		end
+	)
+	return true
+end
+
+
+
+
diff --git a/MCServer/Plugins/Debuggers/Info.lua b/MCServer/Plugins/Debuggers/Info.lua
new file mode 100644
index 000000000..b96ef3de5
--- /dev/null
+++ b/MCServer/Plugins/Debuggers/Info.lua
@@ -0,0 +1,223 @@
+
+-- Info.lua
+
+-- Implements the g_PluginInfo standard plugin description
+
+
+
+
+
+g_PluginInfo =
+{
+	Name = "Debuggers",
+	Version = "14",
+	Date = "2014-12-11",
+	Description = [[Contains code for testing and debugging the server. Should not be enabled on a production server!]],
+	
+	Commands =
+	{
+		["/arr"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleArrowCmd,
+			HelpString = "Creates an arrow going away from the player"
+		},
+		["/compo"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleCompo,
+			HelpString = "Tests the cCompositeChat bindings"
+		},
+		["/cs"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleChunkStay,
+			HelpString = "Tests the ChunkStay Lua integration for the specified chunk coords"
+		},
+		["/dash"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleDashCmd,
+			HelpString = "Switches between fast and normal sprinting speed"
+		},
+		["/ench"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleEnchCmd,
+			HelpString = "Provides an instant dummy enchantment window"
+		},
+		["/fast"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleFastCmd,
+			HelpString = "Switches between fast and normal movement speed"
+		},
+		["/fb"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleFireballCmd,
+			HelpString = "Creates a ghast fireball as if shot by the player"
+		},
+		["/ff"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleFurnaceFuel,
+			HelpString = "Shows how long the currently held item would burn in a furnace"
+		},
+		["/fill"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleFill,
+			HelpString = "Fills all block entities in current chunk with junk"
+		},
+		["/fl"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleFoodLevelCmd,
+			HelpString = "Sets the food level to the given value"
+		},
+		["/fr"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleFurnaceRecipe,
+			HelpString = "Shows the furnace recipe for the currently held item"
+		},
+		["/fs"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleFoodStatsCmd,
+			HelpString = "Turns regular foodstats message on or off"
+		},
+		["/gc"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleGCCmd,
+			HelpString = "Activates the Lua garbage collector"
+		},
+		["/hunger"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleHungerCmd,
+			HelpString = "Lists the current hunger-related variables"
+		},
+		["/ke"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleKillEntitiesCmd,
+			HelpString = "Kills all the loaded entities"
+		},
+		["/le"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleListEntitiesCmd,
+			HelpString = "Shows a list of all the loaded entities"
+		},
+		["/nick"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleNickCmd,
+			HelpString = "Gives you a custom name",
+		},
+		["/pickups"] =
+		{
+			Permission = "debuggers",
+			Handler = HandlePickups,
+			HelpString = "Spawns random pickups around you"
+		},
+		["/poison"] =
+		{
+			Permission = "debuggers",
+			Handler = HandlePoisonCmd,
+			HelpString = "Sets food-poisoning for 15 seconds"
+		},
+		["/poof"] =
+		{
+			Permission = "debuggers",
+			Handler = HandlePoof,
+			HelpString = "Nudges pickups close to you away from you"
+		},
+		["/rmitem"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleRMItem,
+			HelpString = "Remove the specified item from the inventory."
+		},
+		["/sb"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleSetBiome,
+			HelpString = "Sets the biome around you to the specified one"
+		},
+		["/sched"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleSched,
+			HelpString = "Schedules a simple countdown using cWorld:ScheduleTask()"
+		},
+		["/spidey"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleSpideyCmd,
+			HelpString = "Shoots a line of web blocks until it hits non-air"
+		},
+		["/starve"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleStarveCmd,
+			HelpString = "Sets the food level to zero"
+		},
+		["/testwnd"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleTestWndCmd,
+			HelpString = "Opens up a window using plugin API"
+		},
+		["/wesel"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleWESel,
+			HelpString = "Expands the current WE selection by 1 block in X/Z"
+		},
+		["/wool"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleWoolCmd,
+			HelpString = "Sets all your armor to blue wool"
+		},
+		["/xpa"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleAddExperience,
+			HelpString = "Adds 200 experience to the player"
+		},
+		["/xpr"] =
+		{
+			Permission = "debuggers",
+			Handler = HandleRemoveXp,
+			HelpString = "Remove all xp"
+		},
+	},  -- Commands
+	
+	ConsoleCommands =
+	{
+		["sched"] =
+		{
+			Handler = HandleConsoleSchedule,
+			HelpString = "Tests the world scheduling",
+		},
+		["loadchunk"] =
+		{
+			Handler = HandleConsoleLoadChunk,
+			HelpString = "Loads the specified chunk into memory",
+		},
+		["preparechunk"] =
+		{
+			Handler = HandleConsolePrepareChunk,
+			HelpString = "Prepares the specified chunk completely (load / gen / light)",
+		}
+	},  -- ConsoleCommands
+}  -- g_PluginInfo
+
+
+
+
diff --git a/src/Bindings/ManualBindings.cpp b/src/Bindings/ManualBindings.cpp
index 750f7c65a..56f2e73bc 100644
--- a/src/Bindings/ManualBindings.cpp
+++ b/src/Bindings/ManualBindings.cpp
@@ -1874,6 +1874,72 @@ static int tolua_cWorld_ChunkStay(lua_State * tolua_S)
 
 
 
+static int tolua_cWorld_PrepareChunk(lua_State * tolua_S)
+{
+	/* Function signature:
+	World:PrepareChunk(ChunkX, ChunkZ, Callback)
+	*/
+	
+	// Check the param types:
+	cLuaState L(tolua_S);
+	if (
+		!L.CheckParamUserType     (1, "cWorld") ||
+		!L.CheckParamNumber       (2, 3) ||
+		!L.CheckParamFunctionOrNil(4)
+	)
+	{
+		return 0;
+	}
+	
+	// Read the params:
+	cWorld * world = nullptr;
+	int chunkX = 0, chunkZ = 0;
+	L.GetStackValues(1, world, chunkX, chunkZ);
+	if (world == nullptr)
+	{
+		LOGWARNING("World:PrepareChunk(): invalid world parameter");
+		L.LogStackTrace();
+		return 0;
+	}
+
+	// Wrap the Lua callback inside a C++ callback class:
+	class cCallback:
+		public cChunkCoordCallback
+	{
+	public:
+		cCallback(lua_State * a_LuaState):
+			m_LuaState(a_LuaState),
+			m_Callback(m_LuaState, 4)
+		{
+		}
+
+		// cChunkCoordCallback override:
+		virtual void Call(int a_CBChunkX, int a_CBChunkZ) override
+		{
+			if (m_Callback.IsValid())
+			{
+				m_LuaState.Call(m_Callback, a_CBChunkX, a_CBChunkZ);
+			}
+
+			// This is the last reference of this object, we must delete it so that it doesn't leak:
+			delete this;
+		}
+
+	protected:
+		cLuaState m_LuaState;
+		cLuaState::cRef m_Callback;
+	};
+	cCallback * callback = new cCallback(tolua_S);
+
+	// Call the chunk preparation:
+	world->PrepareChunk(chunkX, chunkZ, callback);
+	return 0;
+}
+
+
+
+
+
 static int tolua_cPlayer_GetPermissions(lua_State * tolua_S)
 {
 	// Function signature: cPlayer:GetPermissions() -> {permissions-array}
@@ -3401,6 +3467,7 @@ void ManualBindings::Bind(lua_State * tolua_S)
 			tolua_function(tolua_S, "GetBlockInfo",              tolua_cWorld_GetBlockInfo);
 			tolua_function(tolua_S, "GetBlockTypeMeta",          tolua_cWorld_GetBlockTypeMeta);
 			tolua_function(tolua_S, "GetSignLines",              tolua_cWorld_GetSignLines);
+			tolua_function(tolua_S, "PrepareChunk",              tolua_cWorld_PrepareChunk);
 			tolua_function(tolua_S, "QueueTask",                 tolua_cWorld_QueueTask);
 			tolua_function(tolua_S, "ScheduleTask",              tolua_cWorld_ScheduleTask);
 			tolua_function(tolua_S, "SetSignLines",              tolua_cWorld_SetSignLines);
diff --git a/src/ChunkDef.h b/src/ChunkDef.h
index 260aace58..8f1d416ad 100644
--- a/src/ChunkDef.h
+++ b/src/ChunkDef.h
@@ -410,7 +410,7 @@ typedef std::list<cChunkCoordsWithBool> cChunkCoordsWithBoolList;
 
 
 
-/// Interface class used as a callback for operations that involve chunk coords
+/** Interface class used as a callback for operations that involve chunk coords */
 class cChunkCoordCallback
 {
 public:
@@ -424,6 +424,27 @@ public:
 
 
 
+/** Provides storage for a set of chunk coords together with a callback.
+Used for chunk queues that notify about processed items. */
+class cChunkCoordsWithCallback
+{
+public:
+	cChunkCoordsWithCallback(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback * a_Callback):
+		m_ChunkX(a_ChunkX),
+		m_ChunkZ(a_ChunkZ),
+		m_Callback(a_Callback)
+	{
+	}
+
+	int m_ChunkX;
+	int m_ChunkZ;
+	cChunkCoordCallback * m_Callback;
+};
+
+
+
+
+
 /** Generic template that can store any kind of data together with a triplet of 3 coords*/
 template <typename X> class cCoordWithData
 {
diff --git a/src/ChunkMap.cpp b/src/ChunkMap.cpp
index 8a8f17a1b..222a756b1 100644
--- a/src/ChunkMap.cpp
+++ b/src/ChunkMap.cpp
@@ -2349,6 +2349,103 @@ void cChunkMap::TouchChunk(int a_ChunkX, int a_ChunkZ)
 
 
 
+void cChunkMap::PrepareChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback * a_Callback)
+{
+	cCSLock Lock(m_CSLayers);
+	cChunkPtr Chunk = GetChunkNoLoad(a_ChunkX, a_ChunkZ);
+
+	// If the chunk is not prepared, queue it in the lighting thread, that will do all the needed processing:
+	if ((Chunk == nullptr) || !Chunk->IsValid() || !Chunk->IsLightValid())
+	{
+		m_World->GetLightingThread().QueueChunk(a_ChunkX, a_ChunkZ, a_Callback);
+		return;
+	}
+
+	// The chunk is present and lit, just call the callback:
+	if (a_Callback != nullptr)
+	{
+		a_Callback->Call(a_ChunkX, a_ChunkZ);
+	}
+}
+
+
+
+
+
+bool cChunkMap::GenerateChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback * a_Callback)
+{
+	cCSLock Lock(m_CSLayers);
+	cChunkPtr Chunk = GetChunkNoLoad(a_ChunkX, a_ChunkZ);
+	if (Chunk == nullptr)
+	{
+		// Generic error while getting the chunk - out of memory?
+		return false;
+	}
+
+	// Try loading the chunk:
+	if ((Chunk == nullptr) || (!Chunk->IsValid()))
+	{
+		class cPrepareLoadCallback: public cChunkCoordCallback
+		{
+		public:
+			cPrepareLoadCallback(cWorld & a_World, cChunkMap & a_ChunkMap, cChunkCoordCallback * a_Callback):
+				m_World(a_World),
+				m_ChunkMap(a_ChunkMap),
+				m_Callback(a_Callback)
+			{
+			}
+
+			// cChunkCoordCallback override:
+			virtual void Call(int a_CBChunkX, int a_CBChunkZ) override
+			{
+				// The chunk has been loaded or an error occurred, check if it's valid now:
+				cChunkPtr CBChunk = m_ChunkMap.GetChunkNoLoad(a_CBChunkX, a_CBChunkZ);
+
+				if (CBChunk == nullptr)
+				{
+					// An error occurred, but we promised to call the callback, so call it even when there's no real chunk data:
+					if (m_Callback != nullptr)
+					{
+						m_Callback->Call(a_CBChunkX, a_CBChunkZ);
+					}
+					return;
+				}
+
+				// If the chunk is not valid, queue it in the generator:
+				if (!CBChunk->IsValid())
+				{
+					m_World.GetGenerator().QueueGenerateChunk(a_CBChunkX, a_CBChunkZ, false, m_Callback);
+					return;
+				}
+
+				// The chunk was loaded, call the callback:
+				if (m_Callback != nullptr)
+				{
+					m_Callback->Call(a_CBChunkX, a_CBChunkZ);
+				}
+			}
+
+		protected:
+			cWorld & m_World;
+			cChunkMap & m_ChunkMap;
+			cChunkCoordCallback * m_Callback;
+		};
+		m_World->GetStorage().QueueLoadChunk(a_ChunkX, a_ChunkZ, new cPrepareLoadCallback(*m_World, *this, a_Callback));
+		return true;
+	}
+
+	// The chunk is valid, just call the callback:
+	if (a_Callback != nullptr)
+	{
+		a_Callback->Call(a_ChunkX, a_ChunkZ);
+	}
+	return true;
+}
+
+
+
+
+
 void cChunkMap::ChunkLoadFailed(int a_ChunkX, int a_ChunkZ)
 {
 	cCSLock Lock(m_CSLayers);
diff --git a/src/ChunkMap.h b/src/ChunkMap.h
index 51be5cb3d..6a858b06d 100644
--- a/src/ChunkMap.h
+++ b/src/ChunkMap.h
@@ -280,6 +280,20 @@ public:
 
 	/** Touches the chunk, causing it to be loaded or generated */
 	void TouchChunk(int a_ChunkX, int a_ChunkZ);
+
+	/** Queues the chunk for preparing - making sure that it's generated and lit.
+	The specified chunk is queued to be loaded or generated, and lit if needed.
+	The specified callback is called after the chunk has been prepared. If there's no preparation to do, only the callback is called.
+	It is legal to call without the callback. */
+	void PrepareChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback * a_CallAfter = nullptr);  // Lua-accessible
+
+	/** Queues the chunk for generating.
+	First attempts to load the chunk from the storage. If that fails, queues the chunk for generating.
+	The specified callback is called after the chunk has been loaded / generated.
+	It is legal to call without the callback.
+	Returns true if successful, false if not (possibly an out-of-memory error).
+	If the return value is true, the callback was / will be called. */
+	bool GenerateChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback * a_CallAfter = nullptr);  // Lua-accessible
 	
 	/** Marks the chunk as failed-to-load */
 	void ChunkLoadFailed(int a_ChunkX, int a_ChunkZ);
diff --git a/src/Generating/ChunkGenerator.cpp b/src/Generating/ChunkGenerator.cpp
index d2e7b47b4..854aac60d 100644
--- a/src/Generating/ChunkGenerator.cpp
+++ b/src/Generating/ChunkGenerator.cpp
@@ -110,29 +110,19 @@ void cChunkGenerator::Stop(void)
 
 
 
-void cChunkGenerator::QueueGenerateChunk(int a_ChunkX, int a_ChunkZ, bool a_ForceGenerate)
+void cChunkGenerator::QueueGenerateChunk(int a_ChunkX, int a_ChunkZ, bool a_ForceGenerate, cChunkCoordCallback * a_Callback)
 {
 	ASSERT(m_ChunkSink->IsChunkQueued(a_ChunkX, a_ChunkZ));
 
 	{
 		cCSLock Lock(m_CS);
 
-		// Check if it is already in the queue:
-		for (cChunkCoordsWithBoolList::iterator itr = m_Queue.begin(); itr != m_Queue.end(); ++itr)
-		{
-			if ((itr->m_ChunkX == a_ChunkX) && (itr->m_ChunkZ == a_ChunkZ))
-			{
-				// Already in the queue, bail out
-				return;
-			}
-		}  // for itr - m_Queue[]
-
 		// Add to queue, issue a warning if too many:
 		if (m_Queue.size() >= QUEUE_WARNING_LIMIT)
 		{
 			LOGWARN("WARNING: Adding chunk [%i, %i] to generation queue; Queue is too big! (" SIZE_T_FMT ")", a_ChunkX, a_ChunkZ, m_Queue.size());
 		}
-		m_Queue.push_back(cChunkCoordsWithBool(a_ChunkX, a_ChunkZ, a_ForceGenerate));
+		m_Queue.push_back(cQueueItem{a_ChunkX, a_ChunkZ, a_ForceGenerate, a_Callback});
 	}
 
 	m_Event.Set();
@@ -242,9 +232,9 @@ void cChunkGenerator::Execute(void)
 			continue;
 		}
 
-		cChunkCoordsWithBool coords = m_Queue.front();  // Get next coord from queue
+		cQueueItem item = m_Queue.front();  // Get next chunk from the queue
 		bool SkipEnabled = (m_Queue.size() > QUEUE_SKIP_LIMIT);
-		m_Queue.erase(m_Queue.begin());  // Remove coordinate from queue
+		m_Queue.erase(m_Queue.begin());  // Remove the item from the queue
 		Lock.Unlock();  // Unlock ASAP
 		m_evtRemoved.Set();
 
@@ -258,22 +248,35 @@ void cChunkGenerator::Execute(void)
 			LastReportTick = clock();
 		}
 
-		if (!coords.m_ForceGenerate && m_ChunkSink->IsChunkValid(coords.m_ChunkX, coords.m_ChunkZ))
+		// Skip the chunk if it's already generated and regeneration is not forced:
+		if (!item.m_ForceGenerate && m_ChunkSink->IsChunkValid(item.m_ChunkX, item.m_ChunkZ))
 		{
-			LOGD("Chunk [%d, %d] already generated, skipping generation", coords.m_ChunkX, coords.m_ChunkZ);
-			// Already generated, ignore request
+			LOGD("Chunk [%d, %d] already generated, skipping generation", item.m_ChunkX, item.m_ChunkZ);
+			if (item.m_Callback != nullptr)
+			{
+				item.m_Callback->Call(item.m_ChunkX, item.m_ChunkZ);
+			}
 			continue;
 		}
 
-		if (SkipEnabled && !m_ChunkSink->HasChunkAnyClients(coords.m_ChunkX, coords.m_ChunkZ))
+		// Skip the chunk if the generator is overloaded:
+		if (SkipEnabled && !m_ChunkSink->HasChunkAnyClients(item.m_ChunkX, item.m_ChunkZ))
 		{
-			LOGWARNING("Chunk generator overloaded, skipping chunk [%d, %d]", coords.m_ChunkX, coords.m_ChunkZ);
+			LOGWARNING("Chunk generator overloaded, skipping chunk [%d, %d]", item.m_ChunkX, item.m_ChunkZ);
+			if (item.m_Callback != nullptr)
+			{
+				item.m_Callback->Call(item.m_ChunkX, item.m_ChunkZ);
+			}
 			continue;
 		}
 
-		LOGD("Generating chunk [%d, %d]", coords.m_ChunkX, coords.m_ChunkZ);
-		DoGenerate(coords.m_ChunkX, coords.m_ChunkZ);
-
+		// Generate the chunk:
+		LOGD("Generating chunk [%d, %d]", item.m_ChunkX, item.m_ChunkZ);
+		DoGenerate(item.m_ChunkX, item.m_ChunkZ);
+		if (item.m_Callback != nullptr)
+		{
+			item.m_Callback->Call(item.m_ChunkX, item.m_ChunkZ);
+		}
 		NumChunksGenerated++;
 	}  // while (!bStop)
 }
diff --git a/src/Generating/ChunkGenerator.h b/src/Generating/ChunkGenerator.h
index 190d9e616..4af486ae1 100644
--- a/src/Generating/ChunkGenerator.h
+++ b/src/Generating/ChunkGenerator.h
@@ -119,8 +119,12 @@ public:
 	bool Start(cPluginInterface & a_PluginInterface, cChunkSink & a_ChunkSink, cIniFile & a_IniFile);
 	void Stop(void);
 
-	/// Queues the chunk for generation; removes duplicate requests
-	void QueueGenerateChunk(int a_ChunkX, int a_ChunkZ, bool a_ForceGenerate);
+	/** Queues the chunk for generation
+	If a-ForceGenerate is set, the chunk is regenerated even if the data is already present in the chunksink.
+	a_Callback is called after the chunk is generated. If the chunk was already present, the callback is still called, even if not regenerating.
+	It is legal to set the callback to nullptr, no callback is called then.
+	If the generator becomes overloaded and skips this chunk, the callback is still called. */
+	void QueueGenerateChunk(int a_ChunkX, int a_ChunkZ, bool a_ForceGenerate, cChunkCoordCallback * a_Callback = nullptr);
 	
 	/// Generates the biomes for the specified chunk (directly, not in a separate thread). Used by the world loader if biomes failed loading.
 	void GenerateBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap);
@@ -131,22 +135,46 @@ public:
 	
 	int GetSeed(void) const { return m_Seed; }
 	
-	/// Returns the biome at the specified coords. Used by ChunkMap if an invalid chunk is queried for biome
+	/** Returns the biome at the specified coords. Used by ChunkMap if an invalid chunk is queried for biome */
 	EMCSBiome GetBiomeAt(int a_BlockX, int a_BlockZ);
 
-	/// Reads a block type from the ini file; returns the blocktype on success, emits a warning and returns a_Default's representation on failure.
+	/** Reads a block type from the ini file; returns the blocktype on success, emits a warning and returns a_Default's representation on failure. */
 	static BLOCKTYPE GetIniBlock(cIniFile & a_IniFile, const AString & a_SectionName, const AString & a_ValueName, const AString & a_Default);
 	
 private:
 
+	struct cQueueItem
+	{
+		/** The chunk coords */
+		int m_ChunkX, m_ChunkZ;
+
+		/** Force the regeneration of an already existing chunk */
+		bool m_ForceGenerate;
+
+		/** Callback to call after generating.*/
+		cChunkCoordCallback * m_Callback;
+	};
+
+	typedef std::list<cQueueItem> cGenQueue;
+
+
+	/** Seed used for the generator. */
 	int m_Seed;
 
-	cCriticalSection         m_CS;
-	cChunkCoordsWithBoolList m_Queue;
-	cEvent                   m_Event;       ///< Set when an item is added to the queue or the thread should terminate
-	cEvent                   m_evtRemoved;  ///< Set when an item is removed from the queue
+	/** CS protecting access to the queue. */
+	cCriticalSection m_CS;
+
+	/** Queue of the chunks to be generated. Protected against multithreaded access by m_CS. */
+	cGenQueue m_Queue;
+
+	/** Set when an item is added to the queue or the thread should terminate. */
+	cEvent m_Event;
+
+	/** Set when an item is removed from the queue. */
+	cEvent m_evtRemoved;
 	
-	cGenerator * m_Generator;  ///< The actual generator engine used to generate chunks
+	/** The actual generator engine used to generate chunks. */
+	cGenerator * m_Generator;
 	
 	/** The plugin interface that may modify the generated chunks */
 	cPluginInterface * m_PluginInterface;
@@ -158,6 +186,7 @@ private:
 	// cIsThread override:
 	virtual void Execute(void) override;
 
+	/** Generates the specified chunk and sets it into the chunksink. */
 	void DoGenerate(int a_ChunkX, int a_ChunkZ);
 };
 
diff --git a/src/LightingThread.cpp b/src/LightingThread.cpp
index ae5e746e7..ced95d4e1 100644
--- a/src/LightingThread.cpp
+++ b/src/LightingThread.cpp
@@ -226,6 +226,8 @@ void cLightingThread::Execute(void)
 		}  // CSLock(m_CS)
 		
 		LightChunk(*Item);
+		Item->Disable();
+		delete Item;
 	}
 }
 
@@ -236,6 +238,16 @@ void cLightingThread::Execute(void)
 
 void cLightingThread::LightChunk(cLightingChunkStay & a_Item)
 {
+	// If the chunk is already lit, skip it:
+	if (m_World->IsChunkLighted(a_Item.m_ChunkX, a_Item.m_ChunkZ))
+	{
+		if (a_Item.m_CallbackAfter != nullptr)
+		{
+			a_Item.m_CallbackAfter->Call(a_Item.m_ChunkX, a_Item.m_ChunkZ);
+		}
+		return;
+	}
+
 	cChunkDef::BlockNibbles BlockLight, SkyLight;
 	
 	ReadChunks(a_Item.m_ChunkX, a_Item.m_ChunkZ);
@@ -314,8 +326,6 @@ void cLightingThread::LightChunk(cLightingChunkStay & a_Item)
 	{
 		a_Item.m_CallbackAfter->Call(a_Item.m_ChunkX, a_Item.m_ChunkZ);
 	}
-	a_Item.Disable();
-	delete &a_Item;
 }
 
 
diff --git a/src/OSSupport/Queue.h b/src/OSSupport/Queue.h
index 8d096fe29..82f221453 100644
--- a/src/OSSupport/Queue.h
+++ b/src/OSSupport/Queue.h
@@ -163,6 +163,29 @@ public:
 		return false;
 	}
 
+
+	/** Removes all items for which the predicate returns true. */
+	template <class Predicate>
+	void RemoveIf(Predicate a_Predicate)
+	{
+		cCSLock Lock(m_CS);
+		for (auto itr = m_Contents.begin(); itr != m_Contents.end();)
+		{
+			if (a_Predicate(*itr))
+			{
+				auto itr2 = itr;
+				++itr2;
+				m_Contents.erase(itr);
+				m_evtRemoved.Set();
+				itr = itr2;
+			}
+			else
+			{
+				++itr;
+			}
+		}  // for itr - m_Contents[]
+	}
+
 private:
 	/// The contents of the queue
 	QueueType m_Contents;
diff --git a/src/Root.cpp b/src/Root.cpp
index 29daaedcc..9f8ffeeff 100644
--- a/src/Root.cpp
+++ b/src/Root.cpp
@@ -196,7 +196,7 @@ void cRoot::Start(void)
 		}
 		#endif
 
-		LOG("Startup complete, took %ld ms!", std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::steady_clock::now() - BeginTime).count());
+		LOG("Startup complete, took %ld ms!", static_cast<long int>(std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::steady_clock::now() - BeginTime).count()));
 		#ifdef _WIN32
 		EnableMenuItem(hmenu, SC_CLOSE, MF_ENABLED);  // Re-enable close button
 		#endif
diff --git a/src/World.cpp b/src/World.cpp
index db19649f3..1bee6e344 100644
--- a/src/World.cpp
+++ b/src/World.cpp
@@ -115,7 +115,7 @@ public:
 		{
 			int chunkX, chunkZ;
 			DecodeChunkCoords(i, chunkX, chunkZ);
-			m_World.GetLightingThread().QueueChunk(chunkX, chunkZ, this);
+			m_World.PrepareChunk(chunkX, chunkZ, this);
 		}  // for i
 
 		// Wait for the lighting thread to prepare everything. Event is set in the Call() callback:
@@ -2907,6 +2907,15 @@ void cWorld::TouchChunk(int a_ChunkX, int a_ChunkZ)
 
 
 
+void cWorld::PrepareChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback * a_CallAfter)
+{
+	m_ChunkMap->PrepareChunk(a_ChunkX, a_ChunkZ, a_CallAfter);
+}
+
+
+
+
+
 void cWorld::ChunkLoadFailed(int a_ChunkX, int a_ChunkZ)
 {
 	m_ChunkMap->ChunkLoadFailed(a_ChunkX, a_ChunkZ);
@@ -3017,7 +3026,7 @@ void cWorld::RegenerateChunk(int a_ChunkX, int a_ChunkZ)
 
 void cWorld::GenerateChunk(int a_ChunkX, int a_ChunkZ)
 {
-	m_ChunkMap->TouchChunk(a_ChunkX, a_ChunkZ);
+	m_ChunkMap->GenerateChunk(a_ChunkX, a_ChunkZ);
 }
 
 
diff --git a/src/World.h b/src/World.h
index 2f51d60a1..6f28ba534 100644
--- a/src/World.h
+++ b/src/World.h
@@ -375,6 +375,12 @@ public:
 	
 	/** Touches the chunk, causing it to be loaded or generated */
 	void TouchChunk(int a_ChunkX, int a_ChunkZ);
+
+	/** Queues the chunk for preparing - making sure that it's generated and lit.
+	The specified chunk is queued to be loaded or generated, and lit if needed.
+	The specified callback is called after the chunk has been prepared. If there's no preparation to do, only the callback is called.
+	It is legal to call with no callback. */
+	void PrepareChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback * a_CallAfter = nullptr);
 	
 	/** Marks the chunk as failed-to-load: */
 	void ChunkLoadFailed(int a_ChunkX, int a_ChunkZ);
diff --git a/src/WorldStorage/WorldStorage.cpp b/src/WorldStorage/WorldStorage.cpp
index 31318ee67..c7a295175 100644
--- a/src/WorldStorage/WorldStorage.cpp
+++ b/src/WorldStorage/WorldStorage.cpp
@@ -140,11 +140,11 @@ size_t cWorldStorage::GetSaveQueueLength(void)
 
 
 
-void cWorldStorage::QueueLoadChunk(int a_ChunkX, int a_ChunkZ)
+void cWorldStorage::QueueLoadChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback * a_Callback)
 {
 	ASSERT(m_World->IsChunkQueued(a_ChunkX, a_ChunkZ));
 
-	m_LoadQueue.EnqueueItem(cChunkCoords(a_ChunkX, a_ChunkZ));
+	m_LoadQueue.EnqueueItem(cChunkCoordsWithCallback(a_ChunkX, a_ChunkZ, a_Callback));
 	m_Event.Set();
 }
 
@@ -152,11 +152,11 @@ void cWorldStorage::QueueLoadChunk(int a_ChunkX, int a_ChunkZ)
 
 
 
-void cWorldStorage::QueueSaveChunk(int a_ChunkX, int a_ChunkZ)
+void cWorldStorage::QueueSaveChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback * a_Callback)
 {
 	ASSERT(m_World->IsChunkValid(a_ChunkX, a_ChunkZ));
 
-	m_SaveQueue.EnqueueItemIfNotPresent(cChunkCoords(a_ChunkX, a_ChunkZ));
+	m_SaveQueue.EnqueueItem(cChunkCoordsWithCallback(a_ChunkX, a_ChunkZ, a_Callback));
 	m_Event.Set();
 }
 
@@ -166,7 +166,11 @@ void cWorldStorage::QueueSaveChunk(int a_ChunkX, int a_ChunkZ)
 
 void cWorldStorage::UnqueueLoad(int a_ChunkX, int a_ChunkZ)
 {
-	m_LoadQueue.Remove(cChunkCoords(a_ChunkX, a_ChunkZ));
+	m_LoadQueue.RemoveIf([=](cChunkCoordsWithCallback & a_Item)
+		{
+			return (a_Item.m_ChunkX == a_ChunkX) && (a_Item.m_ChunkZ == a_ChunkZ);
+		}
+	);
 }
 
 
@@ -175,7 +179,11 @@ void cWorldStorage::UnqueueLoad(int a_ChunkX, int a_ChunkZ)
 
 void cWorldStorage::UnqueueSave(const cChunkCoords & a_Chunk)
 {
-	m_SaveQueue.Remove(a_Chunk);
+	m_SaveQueue.RemoveIf([=](cChunkCoordsWithCallback & a_Item)
+		{
+			return (a_Item.m_ChunkX == a_Chunk.m_ChunkX) && (a_Item.m_ChunkZ == a_Chunk.m_ChunkZ);
+		}
+	);
 }
 
 
@@ -244,14 +252,23 @@ void cWorldStorage::Execute(void)
 
 bool cWorldStorage::LoadOneChunk(void)
 {
-	cChunkCoords ToLoad(0, 0);
+	// Dequeue an item, bail out if there's none left:
+	cChunkCoordsWithCallback ToLoad(0, 0, nullptr);
 	bool ShouldLoad = m_LoadQueue.TryDequeueItem(ToLoad);
+	if (!ShouldLoad)
+	{
+		return false;
+	}
 
-	if (ShouldLoad)
+	// Load the chunk:
+	bool res = LoadChunk(ToLoad.m_ChunkX, ToLoad.m_ChunkZ);
+
+	// Call the callback, if specified:
+	if (ToLoad.m_Callback != nullptr)
 	{
-		return LoadChunk(ToLoad.m_ChunkX, ToLoad.m_ChunkZ);
+		ToLoad.m_Callback->Call(ToLoad.m_ChunkX, ToLoad.m_ChunkZ);
 	}
-	return false;
+	return res;
 }
 
 
@@ -260,17 +277,30 @@ bool cWorldStorage::LoadOneChunk(void)
 
 bool cWorldStorage::SaveOneChunk(void)
 {
-	cChunkCoords ToSave(0, 0);
+	// Dequeue one chunk to save:
+	cChunkCoordsWithCallback ToSave(0, 0, nullptr);
 	bool ShouldSave = m_SaveQueue.TryDequeueItem(ToSave);
-	if (ShouldSave && m_World->IsChunkValid(ToSave.m_ChunkX, ToSave.m_ChunkZ))
+	if (!ShouldSave)
+	{
+		return false;
+	}
+	
+	// Save the chunk, if it's valid:
+	if (m_World->IsChunkValid(ToSave.m_ChunkX, ToSave.m_ChunkZ))
 	{
 		m_World->MarkChunkSaving(ToSave.m_ChunkX, ToSave.m_ChunkZ);
-		if (m_SaveSchema->SaveChunk(ToSave))
+		if (m_SaveSchema->SaveChunk(cChunkCoords(ToSave.m_ChunkX, ToSave.m_ChunkZ)))
 		{
 			m_World->MarkChunkSaved(ToSave.m_ChunkX, ToSave.m_ChunkZ);
 		}
 	}
-	return ShouldSave;
+
+	// Call the callback, if specified:
+	if (ToSave.m_Callback != nullptr)
+	{
+		ToSave.m_Callback->Call(ToSave.m_ChunkX, ToSave.m_ChunkZ);
+	}
+	return true;
 }
 
 
diff --git a/src/WorldStorage/WorldStorage.h b/src/WorldStorage/WorldStorage.h
index fc7e9f84c..e9ba2a8e2 100644
--- a/src/WorldStorage/WorldStorage.h
+++ b/src/WorldStorage/WorldStorage.h
@@ -25,7 +25,7 @@
 // fwd:
 class cWorld;
 
-typedef cQueue<cChunkCoords> cChunkCoordsQueue;
+typedef cQueue<cChunkCoordsWithCallback> cChunkCoordsQueue;
 
 
 
@@ -64,8 +64,8 @@ public:
 	cWorldStorage(void);
 	~cWorldStorage();
 	
-	void QueueLoadChunk(int a_ChunkX, int a_ChunkZ);
-	void QueueSaveChunk(int a_ChunkX, int a_ChunkZ);
+	void QueueLoadChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback * a_Callback = nullptr);
+	void QueueSaveChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback * a_Callback = nullptr);
 	
 	void UnqueueLoad(int a_ChunkX, int a_ChunkZ);
 	void UnqueueSave(const cChunkCoords & a_Chunk);