Node definition names

src/CMakeLists.txt

@@ -94,6 +94,7 @@ configure_file(
 )
 
 set(common_SRCS
+	nameidmapping.cpp
 	tooldef.cpp
 	nodedef.cpp
 	luaentity_common.cpp

src/client.cpp

@@ -848,7 +848,7 @@ void Client::ProcessData(u8 *data, u32 datasize, u16 sender_peer_id)
 		//TimeTaker t1("TOCLIENT_ADDNODE");
 
 		MapNode n;
-		n.deSerialize(&data[8], ser_version, m_nodedef);
+		n.deSerialize(&data[8], ser_version);
 		
 		addNode(p, n);
 	}
@@ -2331,4 +2331,11 @@ ITextureSource* Client::getTextureSource()
 {
 	return m_tsrc;
 }
+u16 Client::allocateUnknownNodeId(const std::string &name)
+{
+	errorstream<<"Client::allocateUnknownNodeId(): "
+			<<"Client cannot allocate node IDs"<<std::endl;
+	assert(0);
+	return CONTENT_IGNORE;
+}
 

src/client.h

@@ -324,10 +324,10 @@ public:
 	float getRTT(void);
 
 	// IGameDef interface
-	// Under envlock
 	virtual IToolDefManager* getToolDefManager();
 	virtual INodeDefManager* getNodeDefManager();
 	virtual ITextureSource* getTextureSource();
+	virtual u16 allocateUnknownNodeId(const std::string &name);
 
 private:
 	

src/content_mapnode.h

@@ -42,6 +42,10 @@ extern content_t trans_table_19[21][2];
 MapNode mapnode_translate_from_internal(MapNode n_from, u8 version);
 MapNode mapnode_translate_to_internal(MapNode n_from, u8 version);
 
+// Get legacy node name mapping
+class NameIdMapping;
+void content_mapnode_get_name_id_mapping(NameIdMapping *nimap);
+
 /*
 	Node content type IDs
 	Ranges:

src/gamedef.h

@@ -20,6 +20,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #ifndef GAMEDEF_HEADER
 #define GAMEDEF_HEADER
 
+#include <string>
+
 class IToolDefManager;
 class INodeDefManager;
 //class IItemDefManager; //TODO
@@ -43,6 +45,9 @@ public:
 	// This is always thread-safe, but referencing the irrlicht texture
 	// pointers in other threads than main thread will make things explode.
 	virtual ITextureSource* getTextureSource()=0;
+	
+	// Used for keeping track of names/ids of unknown nodes
+	virtual u16 allocateUnknownNodeId(const std::string &name)=0;
 
 	// Shorthands
 	IToolDefManager* tdef(){return getToolDefManager();}

src/map.cpp

@@ -3367,10 +3367,10 @@ void ServerMap::loadBlock(std::string *blob, v3s16 p3d, MapSector *sector, bool
 			Save blocks loaded in old format in new format
 		*/
 
-		if(version < SER_FMT_VER_HIGHEST || save_after_load)
+		//if(version < SER_FMT_VER_HIGHEST || save_after_load)
-		{
+		// Only save if asked to; no need to update version
+		if(save_after_load)
 			saveBlock(block);
-		}
 		
 		// We just loaded it from, so it's up-to-date.
 		block->resetModified();

src/mapblock.cpp

@@ -18,14 +18,18 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 */
 
 #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
 
 /*
 	MapBlock
@@ -188,13 +192,13 @@ void MapBlock::replaceMesh(scene::SMesh *mesh_new)
 			IMeshBuffer *buf = mesh_old->getMeshBuffer(i);
 		}*/
 		
-		/*dstream<<"mesh_old->getReferenceCount()="
+		/*infostream<<"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()="
+			infostream<<"buf->getReferenceCount()="
 					<<buf->getReferenceCount()<<std::endl;
 		}*/
 
@@ -519,6 +523,86 @@ s16 MapBlock::getGroundLevel(v2s16 p2d)
 	Serialization
 */
 
+// List relevant id-name pairs for ids in the block using nodedef
+static void getBlockNodeIdMapping(NameIdMapping *nimap, MapBlock *block,
+		INodeDefManager *nodedef)
+{
+	std::set<content_t> unknown_contents;
+	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 id = n.getContent();
+		const ContentFeatures &f = nodedef->get(id);
+		const std::string &name = f.name;
+		if(name == "")
+			unknown_contents.insert(id);
+		else
+			nimap->set(id, name);
+	}
+	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.
+void correctBlockNodeIds(const NameIdMapping *nimap, MapBlock *block,
+		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(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 local_id = n.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;
+			}
+		}
+		n.setContent(global_id);
+		block->setNode(p, n);
+	}
+	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)
 {
 	if(!ser_ver_supported(version))
@@ -602,7 +686,7 @@ void MapBlock::serialize(std::ostream &os, u8 version)
 				flags |= 0x08;
 		}
 		os.write((char*)&flags, 1);
-
+		
 		u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
 
 		/*
@@ -663,8 +747,6 @@ void MapBlock::serialize(std::ostream &os, u8 version)
 
 void MapBlock::deSerialize(std::istream &is, u8 version)
 {
-	INodeDefManager *nodemgr = m_gamedef->ndef();
-
 	if(!ser_ver_supported(version))
 		throw VersionMismatchException("ERROR: MapBlock format not supported");
 
@@ -698,7 +780,7 @@ void MapBlock::deSerialize(std::istream &is, u8 version)
 			if(is.gcount() != len)
 				throw SerializationError
 						("MapBlock::deSerialize: no enough input data");
-			data[i].deSerialize(*d, version, nodemgr);
+			data[i].deSerialize(*d, version);
 		}
 	}
 	else if(version <= 10)
@@ -780,7 +862,7 @@ void MapBlock::deSerialize(std::istream &is, u8 version)
 			buf[0] = s[i];
 			buf[1] = s[i+nodecount];
 			buf[2] = s[i+nodecount*2];
-			data[i].deSerialize(buf, version, m_gamedef->getNodeDefManager());
+			data[i].deSerialize(buf, version);
 		}
 		
 		/*
@@ -807,7 +889,7 @@ void MapBlock::deSerialize(std::istream &is, u8 version)
 			}
 			catch(SerializationError &e)
 			{
-				dstream<<"WARNING: MapBlock::deSerialize(): Ignoring an error"
+				errorstream<<"WARNING: MapBlock::deSerialize(): Ignoring an error"
 						<<" while deserializing node metadata"<<std::endl;
 			}
 		}
@@ -834,6 +916,13 @@ void MapBlock::serializeDiskExtra(std::ostream &os, u8 version)
 	{
 		writeU32(os, getTimestamp());
 	}
+
+	// Scan and write node definition id mapping
+	if(version >= 21){
+		NameIdMapping nimap;
+		getBlockNodeIdMapping(&nimap, this, m_gamedef->ndef());
+		nimap.serialize(os);
+	}
 }
 
 void MapBlock::deSerializeDiskExtra(std::istream &is, u8 version)
@@ -841,12 +930,11 @@ void MapBlock::deSerializeDiskExtra(std::istream &is, u8 version)
 	/*
 		Versions up from 9 have block objects. (DEPRECATED)
 	*/
-	if(version >= 9)
+	if(version >= 9){
-	{
 		u16 count = readU16(is);
 		// Not supported and length not known if count is not 0
 		if(count != 0){
-			dstream<<"WARNING: MapBlock::deSerializeDiskExtra(): "
+			errorstream<<"WARNING: MapBlock::deSerializeDiskExtra(): "
 					<<"Ignoring stuff coming at and after MBOs"<<std::endl;
 			return;
 		}
@@ -856,19 +944,24 @@ void MapBlock::deSerializeDiskExtra(std::istream &is, u8 version)
 		Versions up from 15 have static objects.
 	*/
 	if(version >= 15)
-	{
 		m_static_objects.deSerialize(is);
-	}
 		
 	// Timestamp
 	if(version >= 17)
-	{
 		setTimestamp(readU32(is));
-	}
 	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, this, m_gamedef);
 }
 
 /*
@@ -877,9 +970,7 @@ void MapBlock::deSerializeDiskExtra(std::istream &is, u8 version)
 std::string analyze_block(MapBlock *block)
 {
 	if(block == NULL)
-	{
 		return "NULL";
-	}
 
 	std::ostringstream desc;
 	

src/mapblock.h

@@ -39,6 +39,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 class Map;
 class NodeMetadataList;
 class IGameDef;
+class IWritableNodeDefManager;
 
 #define BLOCK_TIMESTAMP_UNDEFINED 0xffffffff
 
@@ -540,8 +541,11 @@ public:
 	// These don't write or read version by itself
 	void serialize(std::ostream &os, u8 version);
 	void deSerialize(std::istream &is, u8 version);
+
 	// Used after the basic ones when writing on disk (serverside)
 	void serializeDiskExtra(std::ostream &os, u8 version);
+	// In addition to doing other things, will add unknown blocks from
+	// id-name mapping to wndef
 	void deSerializeDiskExtra(std::istream &is, u8 version);
 
 private:

src/mapnode.cpp

@@ -268,7 +268,7 @@ void MapNode::serialize(u8 *dest, u8 version)
 		dest[2] = n_foreign.param2;
 	}
 }
-void MapNode::deSerialize(u8 *source, u8 version, INodeDefManager *nodemgr)
+void MapNode::deSerialize(u8 *source, u8 version)
 {
 	if(!ser_ver_supported(version))
 		throw VersionMismatchException("ERROR: MapNode format not supported");
@@ -280,11 +280,6 @@ void MapNode::deSerialize(u8 *source, u8 version, INodeDefManager *nodemgr)
 	else if(version == 1)
 	{
 		param0 = source[0];
-		// This version doesn't support saved lighting
-		if(nodemgr->get(*this).light_propagates || nodemgr->get(*this).light_source > 0)
-			param1 = 0;
-		else
-			param1 = source[1];
 	}
 	else if(version <= 9)
 	{

src/mapnode.h

@@ -221,7 +221,7 @@ struct MapNode
 
 	static u32 serializedLength(u8 version);
 	void serialize(u8 *dest, u8 version);
-	void deSerialize(u8 *source, u8 version, INodeDefManager *nodemgr);
+	void deSerialize(u8 *source, u8 version);
 	
 };
 

src/nameidmapping.cpp

@@ -0,0 +1,50 @@
+/*
+Minetest-c55
+Copyright (C) 2011 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
+(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.
+
+You should have received a copy of the GNU 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 "nameidmapping.h"
+#include "utility.h"
+
+void NameIdMapping::serialize(std::ostream &os) const
+{
+	writeU8(os, 0); // version
+	writeU16(os, m_id_to_name.size());
+	for(std::map<u16, std::string>::const_iterator
+			i = m_id_to_name.begin();
+			i != m_id_to_name.end(); i++){
+		writeU16(os, i->first);
+		os<<serializeString(i->second);
+	}
+}
+
+void NameIdMapping::deSerialize(std::istream &is)
+{
+	int version = readU8(is);
+	if(version != 0)
+		throw SerializationError("unsupported NameIdMapping version");
+	u32 count = readU16(is);
+	m_id_to_name.clear();
+	m_name_to_id.clear();
+	for(u32 i=0; i<count; i++){
+		u16 id = readU16(is);
+		std::string name = deSerializeString(is);
+		m_id_to_name[id] = name;
+		m_name_to_id[name] = id;
+	}
+}
+

src/nameidmapping.h

@@ -0,0 +1,79 @@
+/*
+Minetest-c55
+Copyright (C) 2011 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
+(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.
+
+You should have received a copy of the GNU 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.
+*/
+
+#ifndef NAMEIDMAPPING_HEADER
+#define NAMEIDMAPPING_HEADER
+
+#include <string>
+#include <iostream>
+#include <set>
+#include <map>
+#include "irrlichttypes.h"
+
+class NameIdMapping
+{
+public:
+	void serialize(std::ostream &os) const;
+	void deSerialize(std::istream &is);
+	
+	void clear(){
+		m_id_to_name.clear();
+		m_name_to_id.clear();
+	}
+	void set(u16 id, const std::string &name){
+		m_id_to_name[id] = name;
+		m_name_to_id[name] = id;
+	}
+	void removeId(u16 id){
+		std::string name;
+		bool found = getName(id, name);
+		if(!found) return;
+		m_id_to_name.erase(id);
+		m_name_to_id.erase(name);
+	}
+	void eraseName(const std::string &name){
+		u16 id;
+		bool found = getId(name, id);
+		if(!found) return;
+		m_id_to_name.erase(id);
+		m_name_to_id.erase(name);
+	}
+	bool getName(u16 id, std::string &result) const{
+		std::map<u16, std::string>::const_iterator i;
+		i = m_id_to_name.find(id);
+		if(i == m_id_to_name.end())
+			return false;
+		result = i->second;
+		return true;
+	}
+	bool getId(const std::string &name, u16 &result) const{
+		std::map<std::string, u16>::const_iterator i;
+		i = m_name_to_id.find(name);
+		if(i == m_name_to_id.end())
+			return false;
+		result = i->second;
+		return true;
+	}
+private:
+	std::map<u16, std::string> m_id_to_name;
+	std::map<std::string, u16> m_name_to_id;
+};
+
+#endif
+

src/nodedef.cpp

@@ -26,6 +26,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #endif
 #include "log.h"
 #include "settings.h"
+#include "nameidmapping.h"
 
 /*
 	NodeBox
@@ -318,20 +319,63 @@ class CNodeDefManager: public IWritableNodeDefManager
 public:
 	void clear()
 	{
+		m_name_id_mapping.clear();
 		for(u16 i=0; i<=MAX_CONTENT; i++)
 		{
-			ContentFeatures *f = &m_content_features[i];
+			ContentFeatures &f = m_content_features[i];
-			f->reset(); // Reset to defaults
+			f.reset(); // Reset to defaults
-			if(i == CONTENT_IGNORE || i == CONTENT_AIR){
+			f.setAllTextures("unknown_block.png");
-				f->drawtype = NDT_AIRLIKE;
-				continue;
-			}
-			f->setAllTextures("unknown_block.png");
 		}
-#ifndef SERVER
+		
-		// Make CONTENT_IGNORE to not block the view when occlusion culling
+		// Set CONTENT_AIR
-		m_content_features[CONTENT_IGNORE].solidness = 0;
+		{
-#endif
+			ContentFeatures f;
+			f.name = "air";
+			f.drawtype = NDT_AIRLIKE;
+			f.param_type = CPT_LIGHT;
+			f.light_propagates = true;
+			f.sunlight_propagates = true;
+			f.walkable = false;
+			f.pointable = false;
+			f.diggable = false;
+			f.buildable_to = true;
+			f.air_equivalent = true;
+			set(CONTENT_AIR, f);
+		}
+		// Set CONTENT_IGNORE
+		{
+			ContentFeatures f;
+			f.name = "ignore";
+			f.drawtype = NDT_AIRLIKE;
+			f.param_type = CPT_LIGHT;
+			f.light_propagates = true;
+			f.sunlight_propagates = true;
+			f.walkable = false;
+			f.pointable = false;
+			f.diggable = false;
+			f.buildable_to = true;
+			f.air_equivalent = true;
+			set(CONTENT_AIR, f);
+		}
+	}
+	// CONTENT_IGNORE = not found
+	content_t getFreeId(bool require_full_param2)
+	{
+		// If allowed, first search in the large 4-byte-param2 pool
+		if(!require_full_param2){
+			for(u16 i=0x800; i<=0xfff; i++){
+				const ContentFeatures &f = m_content_features[i];
+				if(f.name == "")
+					return i;
+			}
+		}
+		// Then search from the small 8-byte-param2 pool
+		for(u16 i=0; i<=125; i++){
+			const ContentFeatures &f = m_content_features[i];
+			if(f.name == "")
+				return i;
+		}
+		return CONTENT_IGNORE;
 	}
 	CNodeDefManager()
 	{
@@ -358,18 +402,54 @@ public:
 	{
 		return get(n.getContent());
 	}
-	// Writable
+	virtual bool getId(const std::string &name, content_t &result) const
+	{
+		return m_name_id_mapping.getId(name, result);
+	}
+	// IWritableNodeDefManager
 	virtual void set(content_t c, const ContentFeatures &def)
 	{
 		infostream<<"registerNode: registering content id \""<<c
 				<<"\": name=\""<<def.name<<"\""<<std::endl;
 		assert(c <= MAX_CONTENT);
 		m_content_features[c] = def;
+		if(def.name != "")
+			m_name_id_mapping.set(c, def.name);
 	}
-	virtual ContentFeatures* getModifiable(content_t c)
+	virtual content_t set(const std::string &name,
+			const ContentFeatures &def)
 	{
-		assert(c <= MAX_CONTENT);
+		assert(name == def.name);
-		return &m_content_features[c];
+		u16 id = CONTENT_IGNORE;
+		bool found = m_name_id_mapping.getId(name, id);
+		if(!found){
+			// Determine if full param2 is required
+			bool require_full_param2 = (
+				def.liquid_type == LIQUID_FLOWING
+				||
+				def.drawtype == NDT_FLOWINGLIQUID
+				||
+				def.drawtype == NDT_TORCHLIKE
+				||
+				def.drawtype == NDT_SIGNLIKE
+			);
+			// Get some id
+			id = getFreeId(require_full_param2);
+			if(id == CONTENT_IGNORE)
+				return CONTENT_IGNORE;
+			if(name != "")
+				m_name_id_mapping.set(id, name);
+		}
+		set(id, def);
+		return id;
+	}
+	virtual content_t allocateDummy(const std::string &name)
+	{
+		assert(name != "");
+		ContentFeatures f;
+		f.name = name;
+		f.setAllTextures("unknown_block.png");
+		return set(name, f);
 	}
 	virtual void updateTextures(ITextureSource *tsrc)
 	{
@@ -499,6 +579,8 @@ public:
 		std::ostringstream tmp_os(std::ios::binary);
 		for(u16 i=0; i<=MAX_CONTENT; i++)
 		{
+			if(i == CONTENT_IGNORE || i == CONTENT_AIR)
+				continue;
 			ContentFeatures *f = &m_content_features[i];
 			if(f->name == "")
 				continue;
@@ -523,10 +605,13 @@ public:
 			}
 			ContentFeatures *f = &m_content_features[i];
 			f->deSerialize(tmp_is, gamedef);
+			if(f->name != "")
+				m_name_id_mapping.set(i, f->name);
 		}
 	}
 private:
 	ContentFeatures m_content_features[MAX_CONTENT+1];
+	NameIdMapping m_name_id_mapping;
 };
 
 IWritableNodeDefManager* createNodeDefManager()

src/nodedef.h

@@ -253,6 +253,7 @@ public:
 	// Get node definition
 	virtual const ContentFeatures& get(content_t c) const=0;
 	virtual const ContentFeatures& get(const MapNode &n) const=0;
+	virtual bool getId(const std::string &name, content_t &result) const=0;
 	
 	virtual void serialize(std::ostream &os)=0;
 };
@@ -266,10 +267,16 @@ public:
 	// Get node definition
 	virtual const ContentFeatures& get(content_t c) const=0;
 	virtual const ContentFeatures& get(const MapNode &n) const=0;
+	virtual bool getId(const std::string &name, content_t &result) const=0;
 		
 	// Register node definition
 	virtual void set(content_t c, const ContentFeatures &def)=0;
-	virtual ContentFeatures* getModifiable(content_t c)=0;
+	// Register node definition by name (allocate an id)
+	// If returns CONTENT_IGNORE, could not allocate id
+	virtual content_t set(const std::string &name,
+			const ContentFeatures &def)=0;
+	// If returns CONTENT_IGNORE, could not allocate id
+	virtual content_t allocateDummy(const std::string &name)=0;
 
 	/*
 		Update tile textures to latest return values of TextueSource.

src/serialization.h

@@ -56,11 +56,12 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 	18: new generator (not really necessary, but it's there)
 	19: new content type handling
 	20: many existing content types translated to extended ones
+	21: dynamic content type allocation
 */
 // This represents an uninitialized or invalid format
 #define SER_FMT_VER_INVALID 255
 // Highest supported serialization version
-#define SER_FMT_VER_HIGHEST 20
+#define SER_FMT_VER_HIGHEST 21
 // Lowest supported serialization version
 #define SER_FMT_VER_LOWEST 0
 

src/server.cpp

@@ -4428,6 +4428,10 @@ ITextureSource* Server::getTextureSource()
 {
 	return NULL;
 }
+u16 Server::allocateUnknownNodeId(const std::string &name)
+{
+	return m_nodemgr->allocateDummy(name);
+}
 
 IWritableToolDefManager* Server::getWritableToolDefManager()
 {

src/server.h

@@ -491,6 +491,7 @@ public:
 	virtual IToolDefManager* getToolDefManager();
 	virtual INodeDefManager* getNodeDefManager();
 	virtual ITextureSource* getTextureSource();
+	virtual u16 allocateUnknownNodeId(const std::string &name);
 	
 	IWritableToolDefManager* getWritableToolDefManager();
 	IWritableNodeDefManager* getWritableNodeDefManager();