X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;ds=sidebyside;f=src%2Fmapblock.cpp;h=dd95ab77f8c3f60c93542adee12e3e2f056ddcb9;hb=c824abd7b2e199d9c7e3dcc2839a28275f4120f2;hp=2f6a4b850116522e8bd98c855f91819425ae8ec4;hpb=033ae0dcaecc37fee487e44896a0c0fb4c844e4e;p=oweals%2Fminetest.git

diff --git a/src/mapblock.cpp b/src/mapblock.cpp
index 2f6a4b850..dd95ab77f 100644
--- a/src/mapblock.cpp
+++ b/src/mapblock.cpp
@@ -1,56 +1,72 @@
 /*
-Minetest-c55
-Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
 This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
 (at your option) any later version.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
+GNU Lesser General Public License for more details.
 
-You should have received a copy of the GNU General Public License along
+You should have received a copy of the GNU Lesser General Public License along
 with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
 #include "mapblock.h"
+
+#include <sstream>
 #include "map.h"
 // For g_settings
 #include "main.h"
 #include "light.h"
-#include <sstream>
+#include "nodedef.h"
+#include "nodemetadata.h"
+#include "gamedef.h"
+#include "log.h"
+#include "nameidmapping.h"
+#include "content_mapnode.h" // For legacy name-id mapping
+#include "content_nodemeta.h" // For legacy deserialization
+#ifndef SERVER
+#include "mapblock_mesh.h"
+#endif
+#include "util/string.h"
+#include "util/serialize.h"
+
+#define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"
 
 /*
 	MapBlock
 */
 
-MapBlock::MapBlock(NodeContainer *parent, v3s16 pos, bool dummy):
+MapBlock::MapBlock(Map *parent, v3s16 pos, IGameDef *gamedef, bool dummy):
 		m_parent(parent),
 		m_pos(pos),
+		m_gamedef(gamedef),
 		m_modified(MOD_STATE_WRITE_NEEDED),
+		m_modified_reason("initial"),
+		m_modified_reason_too_long(false),
 		is_underground(false),
 		m_lighting_expired(true),
 		m_day_night_differs(false),
+		m_day_night_differs_expired(true),
 		m_generated(false),
-		m_objects(this),
 		m_timestamp(BLOCK_TIMESTAMP_UNDEFINED),
-		m_usage_timer(BLOCK_TIMESTAMP_UNDEFINED)
+		m_disk_timestamp(BLOCK_TIMESTAMP_UNDEFINED),
+		m_usage_timer(0),
+		m_refcount(0)
 {
 	data = NULL;
 	if(dummy == false)
 		reallocate();
 	
-	//m_spawn_timer = -10000;
-
 #ifndef SERVER
-	m_mesh_expired = false;
-	mesh_mutex.Init();
+	//mesh_mutex.Init();
 	mesh = NULL;
-	m_temp_mods_mutex.Init();
 #endif
 }
 
@@ -58,11 +74,11 @@ MapBlock::~MapBlock()
 {
 #ifndef SERVER
 	{
-		JMutexAutoLock lock(mesh_mutex);
+		//JMutexAutoLock lock(mesh_mutex);
 		
 		if(mesh)
 		{
-			mesh->drop();
+			delete mesh;
 			mesh = NULL;
 		}
 	}
@@ -133,78 +149,6 @@ MapNode MapBlock::getNodeParentNoEx(v3s16 p)
 	}
 }
 
-#ifndef SERVER
-
-#if 1
-void MapBlock::updateMesh(u32 daynight_ratio)
-{
-#if 0
-	/*
-		DEBUG: If mesh has been generated, don't generate it again
-	*/
-	{
-		JMutexAutoLock meshlock(mesh_mutex);
-		if(mesh != NULL)
-			return;
-	}
-#endif
-
-	MeshMakeData data;
-	data.fill(daynight_ratio, this);
-	
-	scene::SMesh *mesh_new = makeMapBlockMesh(&data);
-	
-	/*
-		Replace the mesh
-	*/
-
-	replaceMesh(mesh_new);
-
-}
-#endif
-
-void MapBlock::replaceMesh(scene::SMesh *mesh_new)
-{
-	mesh_mutex.Lock();
-
-	//scene::SMesh *mesh_old = mesh[daynight_i];
-	//mesh[daynight_i] = mesh_new;
-
-	scene::SMesh *mesh_old = mesh;
-	mesh = mesh_new;
-	setMeshExpired(false);
-	
-	if(mesh_old != NULL)
-	{
-		// Remove hardware buffers of meshbuffers of mesh
-		// NOTE: No way, this runs in a different thread and everything
-		/*u32 c = mesh_old->getMeshBufferCount();
-		for(u32 i=0; i<c; i++)
-		{
-			IMeshBuffer *buf = mesh_old->getMeshBuffer(i);
-		}*/
-		
-		/*dstream<<"mesh_old->getReferenceCount()="
-				<<mesh_old->getReferenceCount()<<std::endl;
-		u32 c = mesh_old->getMeshBufferCount();
-		for(u32 i=0; i<c; i++)
-		{
-			scene::IMeshBuffer *buf = mesh_old->getMeshBuffer(i);
-			dstream<<"buf->getReferenceCount()="
-					<<buf->getReferenceCount()<<std::endl;
-		}*/
-
-		// Drop the mesh
-		mesh_old->drop();
-
-		//delete mesh_old;
-	}
-
-	mesh_mutex.Unlock();
-}
-	
-#endif // !SERVER
-
 /*
 	Propagates sunlight down through the block.
 	Doesn't modify nodes that are not affected by sunlight.
@@ -224,9 +168,11 @@ void MapBlock::replaceMesh(scene::SMesh *mesh_new)
 	if black_air_left!=NULL, it is set to true if non-sunlighted
 	air is left in block.
 */
-bool MapBlock::propagateSunlight(core::map<v3s16, bool> & light_sources,
+bool MapBlock::propagateSunlight(std::set<v3s16> & light_sources,
 		bool remove_light, bool *black_air_left)
 {
+	INodeDefManager *nodemgr = m_gamedef->ndef();
+
 	// Whether the sunlight at the top of the bottom block is valid
 	bool block_below_is_valid = true;
 	
@@ -242,7 +188,12 @@ bool MapBlock::propagateSunlight(core::map<v3s16, bool> & light_sources,
 			// Check if node above block has sunlight
 			try{
 				MapNode n = getNodeParent(v3s16(x, MAP_BLOCKSIZE, z));
-				if(n.d == CONTENT_IGNORE || n.getLight(LIGHTBANK_DAY) != LIGHT_SUN)
+				if(n.getContent() == CONTENT_IGNORE)
+				{
+					// Trust heuristics
+					no_sunlight = is_underground;
+				}
+				else if(n.getLight(LIGHTBANK_DAY, m_gamedef->ndef()) != LIGHT_SUN)
 				{
 					no_sunlight = true;
 				}
@@ -260,8 +211,7 @@ bool MapBlock::propagateSunlight(core::map<v3s16, bool> & light_sources,
 				else
 				{
 					MapNode n = getNode(v3s16(x, MAP_BLOCKSIZE-1, z));
-					//if(n.d == CONTENT_WATER || n.d == CONTENT_WATERSOURCE)
-					if(content_features(n.d).sunlight_propagates == false)
+					if(m_gamedef->ndef()->get(n).sunlight_propagates == false)
 					{
 						no_sunlight = true;
 					}
@@ -310,32 +260,12 @@ bool MapBlock::propagateSunlight(core::map<v3s16, bool> & light_sources,
 				{
 					// Do nothing
 				}
-				else if(current_light == LIGHT_SUN && n.sunlight_propagates())
+				else if(current_light == LIGHT_SUN && nodemgr->get(n).sunlight_propagates)
 				{
 					// Do nothing: Sunlight is continued
 				}
-				else if(n.light_propagates() == false)
+				else if(nodemgr->get(n).light_propagates == false)
 				{
-					/*// DEPRECATED TODO: REMOVE
-					if(grow_grass)
-					{
-						bool upper_is_air = false;
-						try
-						{
-							if(getNodeParent(pos+v3s16(0,1,0)).d == CONTENT_AIR)
-								upper_is_air = true;
-						}
-						catch(InvalidPositionException &e)
-						{
-						}
-						// Turn mud into grass
-						if(upper_is_air && n.d == CONTENT_MUD
-								&& current_light == LIGHT_SUN)
-						{
-							n.d = CONTENT_GRASS;
-						}
-					}*/
-
 					// A solid object is on the way.
 					stopped_to_solid_object = true;
 					
@@ -348,16 +278,16 @@ bool MapBlock::propagateSunlight(core::map<v3s16, bool> & light_sources,
 					current_light = diminish_light(current_light);
 				}
 
-				u8 old_light = n.getLight(LIGHTBANK_DAY);
+				u8 old_light = n.getLight(LIGHTBANK_DAY, nodemgr);
 
 				if(current_light > old_light || remove_light)
 				{
-					n.setLight(LIGHTBANK_DAY, current_light);
+					n.setLight(LIGHTBANK_DAY, current_light, nodemgr);
 				}
 				
 				if(diminish_light(current_light) != 0)
 				{
-					light_sources.insert(pos_relative + pos, true);
+					light_sources.insert(pos_relative + pos);
 				}
 
 				if(current_light == 0 && stopped_to_solid_object)
@@ -385,12 +315,12 @@ bool MapBlock::propagateSunlight(core::map<v3s16, bool> & light_sources,
 			if(block_below_is_valid)
 			{
 				MapNode n = getNodeParent(v3s16(x, -1, z));
-				if(n.light_propagates())
+				if(nodemgr->get(n).light_propagates)
 				{
-					if(n.getLight(LIGHTBANK_DAY) == LIGHT_SUN
+					if(n.getLight(LIGHTBANK_DAY, nodemgr) == LIGHT_SUN
 							&& sunlight_should_go_down == false)
 						block_below_is_valid = false;
-					else if(n.getLight(LIGHTBANK_DAY) != LIGHT_SUN
+					else if(n.getLight(LIGHTBANK_DAY, nodemgr) != LIGHT_SUN
 							&& sunlight_should_go_down == true)
 						block_below_is_valid = false;
 				}
@@ -429,19 +359,12 @@ void MapBlock::copyFrom(VoxelManipulator &dst)
 			getPosRelative(), data_size);
 }
 
-void MapBlock::stepObjects(float dtime, bool server, u32 daynight_ratio)
+void MapBlock::actuallyUpdateDayNightDiff()
 {
-	/*
-		Step objects
-	*/
-	m_objects.step(dtime, server, daynight_ratio);
-
-	setChangedFlag();
-}
-
+	INodeDefManager *nodemgr = m_gamedef->ndef();
+	// Running this function un-expires m_day_night_differs
+	m_day_night_differs_expired = false;
 
-void MapBlock::updateDayNightDiff()
-{
 	if(data == NULL)
 	{
 		m_day_night_differs = false;
@@ -456,7 +379,7 @@ void MapBlock::updateDayNightDiff()
 	for(u32 i=0; i<MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++)
 	{
 		MapNode &n = data[i];
-		if(n.getLight(LIGHTBANK_DAY) != n.getLight(LIGHTBANK_NIGHT))
+		if(n.getLight(LIGHTBANK_DAY, nodemgr) != n.getLight(LIGHTBANK_NIGHT, nodemgr))
 		{
 			differs = true;
 			break;
@@ -473,7 +396,7 @@ void MapBlock::updateDayNightDiff()
 		for(u32 i=0; i<MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++)
 		{
 			MapNode &n = data[i];
-			if(n.d != CONTENT_AIR)
+			if(n.getContent() != CONTENT_AIR)
 			{
 				only_air = false;
 				break;
@@ -487,6 +410,19 @@ void MapBlock::updateDayNightDiff()
 	m_day_night_differs = differs;
 }
 
+void MapBlock::expireDayNightDiff()
+{
+	//INodeDefManager *nodemgr = m_gamedef->ndef();
+
+	if(data == NULL){
+		m_day_night_differs = false;
+		m_day_night_differs_expired = false;
+		return;
+	}
+
+	m_day_night_differs_expired = true;
+}
+
 s16 MapBlock::getGroundLevel(v2s16 p2d)
 {
 	if(isDummy())
@@ -496,8 +432,8 @@ s16 MapBlock::getGroundLevel(v2s16 p2d)
 		s16 y = MAP_BLOCKSIZE-1;
 		for(; y>=0; y--)
 		{
-			//if(is_ground_content(getNodeRef(p2d.X, y, p2d.Y).d))
-			if(content_features(getNodeRef(p2d.X, y, p2d.Y).d).walkable)
+			MapNode n = getNodeRef(p2d.X, y, p2d.Y);
+			if(m_gamedef->ndef()->get(n).walkable)
 			{
 				if(y == MAP_BLOCKSIZE-1)
 					return -2;
@@ -516,8 +452,99 @@ s16 MapBlock::getGroundLevel(v2s16 p2d)
 /*
 	Serialization
 */
+// List relevant id-name pairs for ids in the block using nodedef
+// Renumbers the content IDs (starting at 0 and incrementing
+static void getBlockNodeIdMapping(NameIdMapping *nimap, MapNode *nodes,
+		INodeDefManager *nodedef)
+{
+	std::map<content_t, content_t> mapping;
+	std::set<content_t> unknown_contents;
+	content_t id_counter = 0;
+	for(u32 i=0; i<MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++)
+	{
+		content_t global_id = nodes[i].getContent();
+		content_t id = CONTENT_IGNORE;
 
-void MapBlock::serialize(std::ostream &os, u8 version)
+		// Try to find an existing mapping
+		std::map<content_t, content_t>::iterator j = mapping.find(global_id);
+		if(j != mapping.end())
+		{
+			id = j->second;
+		}
+		else
+		{
+			// We have to assign a new mapping
+			id = id_counter++;
+			mapping.insert(std::make_pair(global_id, id));
+
+			const ContentFeatures &f = nodedef->get(global_id);
+			const std::string &name = f.name;
+			if(name == "")
+				unknown_contents.insert(global_id);
+			else
+				nimap->set(id, name);
+		}
+
+		// Update the MapNode
+		nodes[i].setContent(id);
+	}
+	for(std::set<content_t>::const_iterator
+			i = unknown_contents.begin();
+			i != unknown_contents.end(); i++){
+		errorstream<<"getBlockNodeIdMapping(): IGNORING ERROR: "
+				<<"Name for node id "<<(*i)<<" not known"<<std::endl;
+	}
+}
+// Correct ids in the block to match nodedef based on names.
+// Unknown ones are added to nodedef.
+// Will not update itself to match id-name pairs in nodedef.
+static void correctBlockNodeIds(const NameIdMapping *nimap, MapNode *nodes,
+		IGameDef *gamedef)
+{
+	INodeDefManager *nodedef = gamedef->ndef();
+	// This means the block contains incorrect ids, and we contain
+	// the information to convert those to names.
+	// nodedef contains information to convert our names to globally
+	// correct ids.
+	std::set<content_t> unnamed_contents;
+	std::set<std::string> unallocatable_contents;
+	for(u32 i=0; i<MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++)
+	{
+		content_t local_id = nodes[i].getContent();
+		std::string name;
+		bool found = nimap->getName(local_id, name);
+		if(!found){
+			unnamed_contents.insert(local_id);
+			continue;
+		}
+		content_t global_id;
+		found = nodedef->getId(name, global_id);
+		if(!found){
+			global_id = gamedef->allocateUnknownNodeId(name);
+			if(global_id == CONTENT_IGNORE){
+				unallocatable_contents.insert(name);
+				continue;
+			}
+		}
+		nodes[i].setContent(global_id);
+	}
+	for(std::set<content_t>::const_iterator
+			i = unnamed_contents.begin();
+			i != unnamed_contents.end(); i++){
+		errorstream<<"correctBlockNodeIds(): IGNORING ERROR: "
+				<<"Block contains id "<<(*i)
+				<<" with no name mapping"<<std::endl;
+	}
+	for(std::set<std::string>::const_iterator
+			i = unallocatable_contents.begin();
+			i != unallocatable_contents.end(); i++){
+		errorstream<<"correctBlockNodeIds(): IGNORING ERROR: "
+				<<"Could not allocate global id for node name \""
+				<<(*i)<<"\""<<std::endl;
+	}
+}
+
+void MapBlock::serialize(std::ostream &os, u8 version, bool disk)
 {
 	if(!ser_ver_supported(version))
 		throw VersionMismatchException("ERROR: MapBlock format not supported");
@@ -527,184 +554,226 @@ void MapBlock::serialize(std::ostream &os, u8 version)
 		throw SerializationError("ERROR: Not writing dummy block.");
 	}
 	
-	// These have no compression
-	if(version <= 3 || version == 5 || version == 6)
-	{
-		u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
+	// Can't do this anymore; we have 16-bit dynamically allocated node IDs
+	// in memory; conversion just won't work in this direction.
+	if(version < 24)
+		throw SerializationError("MapBlock::serialize: serialization to "
+				"version < 24 not possible");
 		
-		u32 buflen = 1 + nodecount * MapNode::serializedLength(version);
-		SharedBuffer<u8> dest(buflen);
-
-		dest[0] = is_underground;
+	// First byte
+	u8 flags = 0;
+	if(is_underground)
+		flags |= 0x01;
+	if(getDayNightDiff())
+		flags |= 0x02;
+	if(m_lighting_expired)
+		flags |= 0x04;
+	if(m_generated == false)
+		flags |= 0x08;
+	writeU8(os, flags);
+	
+	/*
+		Bulk node data
+	*/
+	NameIdMapping nimap;
+	u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
+	if(disk)
+	{
+		MapNode *tmp_nodes = new MapNode[nodecount];
 		for(u32 i=0; i<nodecount; i++)
-		{
-			u32 s = 1 + i * MapNode::serializedLength(version);
-			data[i].serialize(&dest[s], version);
-		}
-		
-		os.write((char*)*dest, dest.getSize());
+			tmp_nodes[i] = data[i];
+		getBlockNodeIdMapping(&nimap, tmp_nodes, m_gamedef->ndef());
+
+		u8 content_width = 2;
+		u8 params_width = 2;
+		writeU8(os, content_width);
+		writeU8(os, params_width);
+		MapNode::serializeBulk(os, version, tmp_nodes, nodecount,
+				content_width, params_width, true);
+		delete[] tmp_nodes;
 	}
-	else if(version <= 10)
+	else
 	{
-		/*
-			With compression.
-			Compress the materials and the params separately.
-		*/
-		
-		// First byte
-		os.write((char*)&is_underground, 1);
-
-		u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
+		u8 content_width = 2;
+		u8 params_width = 2;
+		writeU8(os, content_width);
+		writeU8(os, params_width);
+		MapNode::serializeBulk(os, version, data, nodecount,
+				content_width, params_width, true);
+	}
+	
+	/*
+		Node metadata
+	*/
+	std::ostringstream oss(std::ios_base::binary);
+	m_node_metadata.serialize(oss);
+	compressZlib(oss.str(), os);
 
-		// Get and compress materials
-		SharedBuffer<u8> materialdata(nodecount);
-		for(u32 i=0; i<nodecount; i++)
-		{
-			materialdata[i] = data[i].d;
+	/*
+		Data that goes to disk, but not the network
+	*/
+	if(disk)
+	{
+		if(version <= 24){
+			// Node timers
+			m_node_timers.serialize(os, version);
 		}
-		compress(materialdata, os, version);
 
-		// Get and compress lights
-		SharedBuffer<u8> lightdata(nodecount);
-		for(u32 i=0; i<nodecount; i++)
-		{
-			lightdata[i] = data[i].param;
-		}
-		compress(lightdata, os, version);
+		// Static objects
+		m_static_objects.serialize(os);
+
+		// Timestamp
+		writeU32(os, getTimestamp());
+
+		// Write block-specific node definition id mapping
+		nimap.serialize(os);
 		
-		if(version >= 10)
-		{
-			// Get and compress param2
-			SharedBuffer<u8> param2data(nodecount);
-			for(u32 i=0; i<nodecount; i++)
-			{
-				param2data[i] = data[i].param2;
-			}
-			compress(param2data, os, version);
+		if(version >= 25){
+			// Node timers
+			m_node_timers.serialize(os, version);
 		}
 	}
-	// All other versions (newest)
-	else
-	{
-		// First byte
-		u8 flags = 0;
-		if(is_underground)
-			flags |= 0x01;
-		if(m_day_night_differs)
-			flags |= 0x02;
-		if(m_lighting_expired)
-			flags |= 0x04;
-		if(version >= 18)
-		{
-			if(m_generated == false)
-				flags |= 0x08;
-		}
-		os.write((char*)&flags, 1);
+}
 
-		u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
+void MapBlock::deSerialize(std::istream &is, u8 version, bool disk)
+{
+	if(!ser_ver_supported(version))
+		throw VersionMismatchException("ERROR: MapBlock format not supported");
+	
+	TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())<<std::endl);
 
-		/*
-			Get data
-		*/
+	m_day_night_differs_expired = false;
+
+	if(version <= 21)
+	{
+		deSerialize_pre22(is, version, disk);
+		return;
+	}
 
-		SharedBuffer<u8> databuf(nodecount*3);
+	u8 flags = readU8(is);
+	is_underground = (flags & 0x01) ? true : false;
+	m_day_night_differs = (flags & 0x02) ? true : false;
+	m_lighting_expired = (flags & 0x04) ? true : false;
+	m_generated = (flags & 0x08) ? false : true;
 
-		// Get contents
-		for(u32 i=0; i<nodecount; i++)
-		{
-			databuf[i] = data[i].d;
-		}
+	/*
+		Bulk node data
+	*/
+	TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
+			<<": Bulk node data"<<std::endl);
+	u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
+	u8 content_width = readU8(is);
+	u8 params_width = readU8(is);
+	if(content_width != 1 && content_width != 2)
+		throw SerializationError("MapBlock::deSerialize(): invalid content_width");
+	if(params_width != 2)
+		throw SerializationError("MapBlock::deSerialize(): invalid params_width");
+	MapNode::deSerializeBulk(is, version, data, nodecount,
+			content_width, params_width, true);
 
-		// Get params
-		for(u32 i=0; i<nodecount; i++)
-		{
-			databuf[i+nodecount] = data[i].param;
-		}
+	/*
+		NodeMetadata
+	*/
+	TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
+			<<": Node metadata"<<std::endl);
+	// Ignore errors
+	try{
+		std::ostringstream oss(std::ios_base::binary);
+		decompressZlib(is, oss);
+		std::istringstream iss(oss.str(), std::ios_base::binary);
+		if(version >= 23)
+			m_node_metadata.deSerialize(iss, m_gamedef);
+		else
+			content_nodemeta_deserialize_legacy(iss,
+					&m_node_metadata, &m_node_timers,
+					m_gamedef);
+	}
+	catch(SerializationError &e)
+	{
+		errorstream<<"WARNING: MapBlock::deSerialize(): Ignoring an error"
+				<<" while deserializing node metadata at ("
+				<<PP(getPos())<<": "<<e.what()<<std::endl;
+	}
 
-		// Get param2
-		for(u32 i=0; i<nodecount; i++)
-		{
-			databuf[i+nodecount*2] = data[i].param2;
+	/*
+		Data that is only on disk
+	*/
+	if(disk)
+	{
+		// Node timers
+		if(version == 23){
+			// Read unused zero
+			readU8(is);
+		}
+		if(version == 24){
+			TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
+					<<": Node timers (ver==24)"<<std::endl);
+			m_node_timers.deSerialize(is, version);
 		}
 
-		/*
-			Compress data to output stream
-		*/
-
-		compress(databuf, os, version);
+		// Static objects
+		TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
+				<<": Static objects"<<std::endl);
+		m_static_objects.deSerialize(is);
 		
-		/*
-			NodeMetadata
-		*/
-		if(version >= 14)
-		{
-			if(version <= 15)
-			{
-				try{
-					std::ostringstream oss(std::ios_base::binary);
-					m_node_metadata.serialize(oss);
-					os<<serializeString(oss.str());
-				}
-				// This will happen if the string is longer than 65535
-				catch(SerializationError &e)
-				{
-					// Use an empty string
-					os<<serializeString("");
-				}
-			}
-			else
-			{
-				std::ostringstream oss(std::ios_base::binary);
-				m_node_metadata.serialize(oss);
-				compressZlib(oss.str(), os);
-				//os<<serializeLongString(oss.str());
-			}
+		// Timestamp
+		TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
+				<<": Timestamp"<<std::endl);
+		setTimestamp(readU32(is));
+		m_disk_timestamp = m_timestamp;
+		
+		// Dynamically re-set ids based on node names
+		TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
+				<<": NameIdMapping"<<std::endl);
+		NameIdMapping nimap;
+		nimap.deSerialize(is);
+		correctBlockNodeIds(&nimap, data, m_gamedef);
+
+		if(version >= 25){
+			TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
+					<<": Node timers (ver>=25)"<<std::endl);
+			m_node_timers.deSerialize(is, version);
 		}
 	}
+		
+	TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
+			<<": Done."<<std::endl);
 }
 
-void MapBlock::deSerialize(std::istream &is, u8 version)
+/*
+	Legacy serialization
+*/
+
+void MapBlock::deSerialize_pre22(std::istream &is, u8 version, bool disk)
 {
-	if(!ser_ver_supported(version))
-		throw VersionMismatchException("ERROR: MapBlock format not supported");
+	u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
 
-	// These have no lighting info
-	if(version <= 1)
-	{
-		setLightingExpired(true);
-	}
+	// Initialize default flags
+	is_underground = false;
+	m_day_night_differs = false;
+	m_lighting_expired = false;
+	m_generated = true;
 
-	// These have no "generated" field
-	if(version < 18)
-	{
-		m_generated = true;
-	}
+	// Make a temporary buffer
+	u32 ser_length = MapNode::serializedLength(version);
+	SharedBuffer<u8> databuf_nodelist(nodecount * ser_length);
 
 	// These have no compression
 	if(version <= 3 || version == 5 || version == 6)
 	{
-		u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
 		char tmp;
 		is.read(&tmp, 1);
 		if(is.gcount() != 1)
 			throw SerializationError
 					("MapBlock::deSerialize: no enough input data");
 		is_underground = tmp;
-		for(u32 i=0; i<nodecount; i++)
-		{
-			s32 len = MapNode::serializedLength(version);
-			SharedBuffer<u8> d(len);
-			is.read((char*)*d, len);
-			if(is.gcount() != len)
-				throw SerializationError
-						("MapBlock::deSerialize: no enough input data");
-			data[i].deSerialize(*d, version);
-		}
+		is.read((char*)*databuf_nodelist, nodecount * ser_length);
+		if((u32)is.gcount() != nodecount * ser_length)
+			throw SerializationError
+					("MapBlock::deSerialize: no enough input data");
 	}
 	else if(version <= 10)
 	{
-		u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
-
 		u8 t8;
 		is.read((char*)&t8, 1);
 		is_underground = t8;
@@ -719,7 +788,7 @@ void MapBlock::deSerialize(std::istream &is, u8 version)
 						("MapBlock::deSerialize: invalid format");
 			for(u32 i=0; i<s.size(); i++)
 			{
-				data[i].d = s[i];
+				databuf_nodelist[i*ser_length] = s[i];
 			}
 		}
 		{
@@ -732,7 +801,7 @@ void MapBlock::deSerialize(std::istream &is, u8 version)
 						("MapBlock::deSerialize: invalid format");
 			for(u32 i=0; i<s.size(); i++)
 			{
-				data[i].param = s[i];
+				databuf_nodelist[i*ser_length + 1] = s[i];
 			}
 		}
 	
@@ -747,15 +816,13 @@ void MapBlock::deSerialize(std::istream &is, u8 version)
 						("MapBlock::deSerialize: invalid format");
 			for(u32 i=0; i<s.size(); i++)
 			{
-				data[i].param2 = s[i];
+				databuf_nodelist[i*ser_length + 2] = s[i];
 			}
 		}
 	}
 	// All other versions (newest)
 	else
 	{
-		u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
-
 		u8 flags;
 		is.read((char*)&flags, 1);
 		is_underground = (flags & 0x01) ? true : false;
@@ -773,20 +840,12 @@ void MapBlock::deSerialize(std::istream &is, u8 version)
 					("MapBlock::deSerialize: decompress resulted in size"
 					" other than nodecount*3");
 
-		// Set contents
+		// deserialize nodes from buffer
 		for(u32 i=0; i<nodecount; i++)
 		{
-			data[i].d = s[i];
-		}
-		// Set params
-		for(u32 i=0; i<nodecount; i++)
-		{
-			data[i].param = s[i+nodecount];
-		}
-		// Set param2
-		for(u32 i=0; i<nodecount; i++)
-		{
-			data[i].param2 = s[i+nodecount*2];
+			databuf_nodelist[i*ser_length] = s[i];
+			databuf_nodelist[i*ser_length + 1] = s[i+nodecount];
+			databuf_nodelist[i*ser_length + 2] = s[i+nodecount*2];
 		}
 		
 		/*
@@ -800,7 +859,9 @@ void MapBlock::deSerialize(std::istream &is, u8 version)
 				{
 					std::string data = deSerializeString(is);
 					std::istringstream iss(data, std::ios_base::binary);
-					m_node_metadata.deSerialize(iss);
+					content_nodemeta_deserialize_legacy(iss,
+							&m_node_metadata, &m_node_timers,
+							m_gamedef);
 				}
 				else
 				{
@@ -808,87 +869,205 @@ void MapBlock::deSerialize(std::istream &is, u8 version)
 					std::ostringstream oss(std::ios_base::binary);
 					decompressZlib(is, oss);
 					std::istringstream iss(oss.str(), std::ios_base::binary);
-					m_node_metadata.deSerialize(iss);
+					content_nodemeta_deserialize_legacy(iss,
+							&m_node_metadata, &m_node_timers,
+							m_gamedef);
 				}
 			}
 			catch(SerializationError &e)
 			{
-				dstream<<"WARNING: MapBlock::deSerialize(): Ignoring an error"
+				errorstream<<"WARNING: MapBlock::deSerialize(): Ignoring an error"
 						<<" while deserializing node metadata"<<std::endl;
 			}
 		}
 	}
-	
-	/*
-		Translate nodes as specified in the translate_to fields of
-		node features
 
-		NOTE: This isn't really used. Should it be removed?
-	*/
-	for(u32 i=0; i<MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++)
+	// Deserialize node data
+	for(u32 i=0; i<nodecount; i++)
 	{
-		MapNode &n = data[i];
-
-		MapNode *translate_to = content_features(n.d).translate_to;
-		if(translate_to)
-		{
-			dstream<<"MapBlock: WARNING: Translating node "<<n.d<<" to "
-					<<translate_to->d<<std::endl;
-			n = *translate_to;
-		}
+		data[i].deSerialize(&databuf_nodelist[i*ser_length], version);
 	}
-}
 
-void MapBlock::serializeDiskExtra(std::ostream &os, u8 version)
-{
-	// Versions up from 9 have block objects.
-	if(version >= 9)
+	if(disk)
 	{
-		//serializeObjects(os, version); // DEPRECATED
-		// count=0
-		writeU16(os, 0);
-	}
-	
-	// Versions up from 15 have static objects.
-	if(version >= 15)
-	{
-		m_static_objects.serialize(os);
+		/*
+			Versions up from 9 have block objects. (DEPRECATED)
+		*/
+		if(version >= 9){
+			u16 count = readU16(is);
+			// Not supported and length not known if count is not 0
+			if(count != 0){
+				errorstream<<"WARNING: MapBlock::deSerialize_pre22(): "
+						<<"Ignoring stuff coming at and after MBOs"<<std::endl;
+				return;
+			}
+		}
+
+		/*
+			Versions up from 15 have static objects.
+		*/
+		if(version >= 15)
+			m_static_objects.deSerialize(is);
+
+		// Timestamp
+		if(version >= 17){
+			setTimestamp(readU32(is));
+			m_disk_timestamp = m_timestamp;
+		} else {
+			setTimestamp(BLOCK_TIMESTAMP_UNDEFINED);
+		}
+
+		// Dynamically re-set ids based on node names
+		NameIdMapping nimap;
+		// If supported, read node definition id mapping
+		if(version >= 21){
+			nimap.deSerialize(is);
+		// Else set the legacy mapping
+		} else {
+			content_mapnode_get_name_id_mapping(&nimap);
+		}
+		correctBlockNodeIds(&nimap, data, m_gamedef);
 	}
 
-	// Timestamp
-	if(version >= 17)
+
+	// Legacy data changes
+	// This code has to convert from pre-22 to post-22 format.
+	INodeDefManager *nodedef = m_gamedef->ndef();
+	for(u32 i=0; i<nodecount; i++)
 	{
-		writeU32(os, getTimestamp());
+		const ContentFeatures &f = nodedef->get(data[i].getContent());
+		// Mineral
+		if(nodedef->getId("default:stone") == data[i].getContent()
+				&& data[i].getParam1() == 1)
+		{
+			data[i].setContent(nodedef->getId("default:stone_with_coal"));
+			data[i].setParam1(0);
+		}
+		else if(nodedef->getId("default:stone") == data[i].getContent()
+				&& data[i].getParam1() == 2)
+		{
+			data[i].setContent(nodedef->getId("default:stone_with_iron"));
+			data[i].setParam1(0);
+		}
+		// facedir_simple
+		if(f.legacy_facedir_simple)
+		{
+			data[i].setParam2(data[i].getParam1());
+			data[i].setParam1(0);
+		}
+		// wall_mounted
+		if(f.legacy_wallmounted)
+		{
+			u8 wallmounted_new_to_old[8] = {0x04, 0x08, 0x01, 0x02, 0x10, 0x20, 0, 0};
+			u8 dir_old_format = data[i].getParam2();
+			u8 dir_new_format = 0;
+			for(u8 j=0; j<8; j++)
+			{
+				if((dir_old_format & wallmounted_new_to_old[j]) != 0)
+				{
+					dir_new_format = j;
+					break;
+				}
+			}
+			data[i].setParam2(dir_new_format);
+		}
 	}
+
 }
 
-void MapBlock::deSerializeDiskExtra(std::istream &is, u8 version)
+/*
+	Get a quick string to describe what a block actually contains
+*/
+std::string analyze_block(MapBlock *block)
 {
-	/*
-		Versions up from 9 have block objects.
-	*/
-	if(version >= 9)
-	{
-		updateObjects(is, version, NULL, 0);
-	}
+	if(block == NULL)
+		return "NULL";
 
-	/*
-		Versions up from 15 have static objects.
-	*/
-	if(version >= 15)
+	std::ostringstream desc;
+	
+	v3s16 p = block->getPos();
+	char spos[20];
+	snprintf(spos, 20, "(%2d,%2d,%2d), ", p.X, p.Y, p.Z);
+	desc<<spos;
+	
+	switch(block->getModified())
 	{
-		m_static_objects.deSerialize(is);
+	case MOD_STATE_CLEAN:
+		desc<<"CLEAN,           ";
+		break;
+	case MOD_STATE_WRITE_AT_UNLOAD:
+		desc<<"WRITE_AT_UNLOAD, ";
+		break;
+	case MOD_STATE_WRITE_NEEDED:
+		desc<<"WRITE_NEEDED,    ";
+		break;
+	default:
+		desc<<"unknown getModified()="+itos(block->getModified())+", ";
 	}
-		
-	// Timestamp
-	if(version >= 17)
+
+	if(block->isGenerated())
+		desc<<"is_gen [X], ";
+	else
+		desc<<"is_gen [ ], ";
+
+	if(block->getIsUnderground())
+		desc<<"is_ug [X], ";
+	else
+		desc<<"is_ug [ ], ";
+
+	if(block->getLightingExpired())
+		desc<<"lighting_exp [X], ";
+	else
+		desc<<"lighting_exp [ ], ";
+
+	if(block->isDummy())
 	{
-		setTimestamp(readU32(is));
+		desc<<"Dummy, ";
 	}
 	else
 	{
-		setTimestamp(BLOCK_TIMESTAMP_UNDEFINED);
+		bool full_ignore = true;
+		bool some_ignore = false;
+		bool full_air = true;
+		bool some_air = false;
+		for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
+		for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
+		for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
+		{
+			v3s16 p(x0,y0,z0);
+			MapNode n = block->getNode(p);
+			content_t c = n.getContent();
+			if(c == CONTENT_IGNORE)
+				some_ignore = true;
+			else
+				full_ignore = false;
+			if(c == CONTENT_AIR)
+				some_air = true;
+			else
+				full_air = false;
+		}
+		
+		desc<<"content {";
+		
+		std::ostringstream ss;
+		
+		if(full_ignore)
+			ss<<"IGNORE (full), ";
+		else if(some_ignore)
+			ss<<"IGNORE, ";
+		
+		if(full_air)
+			ss<<"AIR (full), ";
+		else if(some_air)
+			ss<<"AIR, ";
+		
+		if(ss.str().size()>=2)
+			desc<<ss.str().substr(0, ss.str().size()-2);
+
+		desc<<"}, ";
 	}
+
+	return desc.str().substr(0, desc.str().size()-2);
 }