X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Fmapblock.cpp;h=840cb9b3994a28da789db0f898433e8da1cc49dd;hb=ab371cc93491baf0973ecc94b96c3a1fdb4abfd5;hp=d2c3232910486771a87e3fd53b1d39ca9e837464;hpb=2a0d1a059e556afaeb7f5b72205b26447e23286f;p=oweals%2Fminetest.git

diff --git a/src/mapblock.cpp b/src/mapblock.cpp
index d2c323291..840cb9b39 100644
--- a/src/mapblock.cpp
+++ b/src/mapblock.cpp
@@ -1,694 +1,348 @@
 /*
-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_materials
-#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
+#include "serialization.h"
+#ifndef SERVER
+#include "mapblock_mesh.h"
+#endif
+#include "util/string.h"
+#include "util/serialize.h"
+#include "util/basic_macros.h"
+
+static const char *modified_reason_strings[] = {
+	"initial",
+	"reallocate",
+	"setIsUnderground",
+	"setLightingExpired",
+	"setGenerated",
+	"setNode",
+	"setNodeNoCheck",
+	"setTimestamp",
+	"NodeMetaRef::reportMetadataChange",
+	"clearAllObjects",
+	"Timestamp expired (step)",
+	"addActiveObjectRaw",
+	"removeRemovedObjects/remove",
+	"removeRemovedObjects/deactivate",
+	"Stored list cleared in activateObjects due to overflow",
+	"deactivateFarObjects: Static data moved in",
+	"deactivateFarObjects: Static data moved out",
+	"deactivateFarObjects: Static data changed considerably",
+	"finishBlockMake: expireDayNightDiff",
+	"unknown",
+};
 
 
 /*
 	MapBlock
 */
 
-bool MapBlock::isValidPositionParent(v3s16 p)
+MapBlock::MapBlock(Map *parent, v3s16 pos, IGameDef *gamedef, bool dummy):
+		m_parent(parent),
+		m_pos(pos),
+		m_pos_relative(pos * MAP_BLOCKSIZE),
+		m_gamedef(gamedef),
+		m_modified(MOD_STATE_WRITE_NEEDED),
+		m_modified_reason(MOD_REASON_INITIAL),
+		is_underground(false),
+		m_lighting_complete(0xFFFF),
+		m_day_night_differs(false),
+		m_day_night_differs_expired(true),
+		m_generated(false),
+		m_timestamp(BLOCK_TIMESTAMP_UNDEFINED),
+		m_disk_timestamp(BLOCK_TIMESTAMP_UNDEFINED),
+		m_usage_timer(0),
+		m_refcount(0)
 {
-	if(isValidPosition(p))
-	{
-		return true;
-	}
-	else{
-		return m_parent->isValidPosition(getPosRelative() + p);
-	}
-}
+	data = NULL;
+	if(dummy == false)
+		reallocate();
 
-MapNode MapBlock::getNodeParent(v3s16 p)
-{
-	if(isValidPosition(p) == false)
-	{
-		return m_parent->getNode(getPosRelative() + p);
-	}
-	else
-	{
-		if(data == NULL)
-			throw InvalidPositionException();
-		return data[p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X];
-	}
+#ifndef SERVER
+	mesh = NULL;
+#endif
 }
 
-void MapBlock::setNodeParent(v3s16 p, MapNode & n)
+MapBlock::~MapBlock()
 {
-	if(isValidPosition(p) == false)
-	{
-		m_parent->setNode(getPosRelative() + p, n);
-	}
-	else
+#ifndef SERVER
 	{
-		if(data == NULL)
-			throw InvalidPositionException();
-		data[p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X] = n;
+		//MutexAutoLock lock(mesh_mutex);
+
+		if(mesh)
+		{
+			delete mesh;
+			mesh = NULL;
+		}
 	}
-}
+#endif
 
-FastFace * MapBlock::makeFastFace(u8 material, u8 light, v3f p,
-		v3f dir, v3f scale, v3f posRelative_f)
-{
-	FastFace *f = new FastFace;
-	
-	// Position is at the center of the cube.
-	v3f pos = p * BS;
-	posRelative_f *= BS;
-
-	v3f vertex_pos[4];
-	// If looking towards z+, this is the face that is behind
-	// the center point, facing towards z+.
-	vertex_pos[0] = v3f( BS/2,-BS/2,BS/2);
-	vertex_pos[1] = v3f(-BS/2,-BS/2,BS/2);
-	vertex_pos[2] = v3f(-BS/2, BS/2,BS/2);
-	vertex_pos[3] = v3f( BS/2, BS/2,BS/2);
-	
-	/*
-		TODO: Rotate it the right way (one side comes upside down)
-	*/
-	core::CMatrix4<f32> m;
-	m.buildRotateFromTo(v3f(0,0,1), dir);
-	
-	for(u16 i=0; i<4; i++){
-		m.rotateVect(vertex_pos[i]);
-		vertex_pos[i].X *= scale.X;
-		vertex_pos[i].Y *= scale.Y;
-		vertex_pos[i].Z *= scale.Z;
-		vertex_pos[i] += pos + posRelative_f;
-	}
-
-	f32 abs_scale = 1.;
-	if     (scale.X < 0.999 || scale.X > 1.001) abs_scale = scale.X;
-	else if(scale.Y < 0.999 || scale.Y > 1.001) abs_scale = scale.Y;
-	else if(scale.Z < 0.999 || scale.Z > 1.001) abs_scale = scale.Z;
-
-	v3f zerovector = v3f(0,0,0);
-	
-	u8 li = decode_light(light);
-	//u8 li = 150;
-
-	u8 alpha = 255;
-
-	if(material == MATERIAL_WATER)
-	{
-		alpha = 128;
-	}
-
-	video::SColor c = video::SColor(alpha,li,li,li);
-
-	/*f->vertices[0] = video::S3DVertex(vertex_pos[0], zerovector, c,
-			core::vector2d<f32>(0,1));
-	f->vertices[1] = video::S3DVertex(vertex_pos[1], zerovector, c,
-			core::vector2d<f32>(abs_scale,1));
-	f->vertices[2] = video::S3DVertex(vertex_pos[2], zerovector, c,
-			core::vector2d<f32>(abs_scale,0));
-	f->vertices[3] = video::S3DVertex(vertex_pos[3], zerovector, c,
-			core::vector2d<f32>(0,0));*/
-	f->vertices[0] = video::S3DVertex(vertex_pos[0], zerovector, c,
-			core::vector2d<f32>(0,1));
-	f->vertices[1] = video::S3DVertex(vertex_pos[1], zerovector, c,
-			core::vector2d<f32>(abs_scale,1));
-	f->vertices[2] = video::S3DVertex(vertex_pos[2], zerovector, c,
-			core::vector2d<f32>(abs_scale,0));
-	f->vertices[3] = video::S3DVertex(vertex_pos[3], zerovector, c,
-			core::vector2d<f32>(0,0));
-
-	f->material = material;
-
-	return f;
+	if(data)
+		delete[] data;
 }
-	
-/*
-	Parameters must consist of air and !air.
-	Order doesn't matter.
 
-	If either of the nodes doesn't exist, light is 0.
-*/
-u8 MapBlock::getFaceLight(v3s16 p, v3s16 face_dir)
+bool MapBlock::isValidPositionParent(v3s16 p)
 {
-	try{
-		MapNode n = getNodeParent(p);
-		MapNode n2 = getNodeParent(p + face_dir);
-		u8 light;
-		if(n.solidness() < n2.solidness())
-			light = n.getLight();
-		else
-			light = n2.getLight();
-
-		// Make some nice difference to different sides
-		if(face_dir.X == 1 || face_dir.Z == 1 || face_dir.Y == -1)
-			light = diminish_light(diminish_light(light));
-		else if(face_dir.X == -1 || face_dir.Z == -1)
-			light = diminish_light(light);
-
-		return light;
-	}
-	catch(InvalidPositionException &e)
+	if(isValidPosition(p))
 	{
-		return 0;
-	}
-}
-
-/*
-	Gets node material from any place relative to block.
-	Returns MATERIAL_AIR if doesn't exist.
-*/
-u8 MapBlock::getNodeMaterial(v3s16 p)
-{
-	try{
-		MapNode n = getNodeParent(p);
-		return n.d;
+		return true;
 	}
-	catch(InvalidPositionException &e)
-	{
-		return MATERIAL_IGNORE;
+	else{
+		return m_parent->isValidPosition(getPosRelative() + p);
 	}
 }
 
-/*
-	startpos:
-	translate_dir: unit vector with only one of x, y or z
-	face_dir: unit vector with only one of x, y or z
-*/
-void MapBlock::updateFastFaceRow(v3s16 startpos,
-		u16 length,
-		v3s16 translate_dir,
-		v3s16 face_dir,
-		core::list<FastFace*> &dest)
+MapNode MapBlock::getNodeParent(v3s16 p, bool *is_valid_position)
 {
-	/*
-		Precalculate some variables
-	*/
-	v3f translate_dir_f(translate_dir.X, translate_dir.Y,
-			translate_dir.Z); // floating point conversion
-	v3f face_dir_f(face_dir.X, face_dir.Y,
-			face_dir.Z); // floating point conversion
-	v3f posRelative_f(getPosRelative().X, getPosRelative().Y,
-			getPosRelative().Z); // floating point conversion
-
-	v3s16 p = startpos;
-	/*
-		The light in the air lights the surface is taken from
-		the node that is air.
-	*/
-	u8 light = getFaceLight(p, face_dir);
-	
-	u16 continuous_materials_count = 0;
-	
-	u8 material0 = getNodeMaterial(p);
-	u8 material1 = getNodeMaterial(p + face_dir);
-		
-	for(u16 j=0; j<length; j++)
-	{
-		bool next_is_different = true;
-		
-		v3s16 p_next;
-		u8 material0_next = 0;
-		u8 material1_next = 0;
-		u8 light_next = 0;
-
-		if(j != length - 1){
-			p_next = p + translate_dir;
-			material0_next = getNodeMaterial(p_next);
-			material1_next = getNodeMaterial(p_next + face_dir);
-			light_next = getFaceLight(p_next, face_dir);
-
-			if(material0_next == material0
-					&& material1_next == material1
-					&& light_next == light)
-			{
-				next_is_different = false;
-			}
-		}
+	if (isValidPosition(p) == false)
+		return m_parent->getNodeNoEx(getPosRelative() + p, is_valid_position);
 
-		continuous_materials_count++;
-		
-		if(next_is_different)
-		{
-			/*
-				Create a face if there should be one
-			*/
-			u8 mf = face_materials(material0, material1);
-			
-			if(mf != 0)
-			{
-				// Floating point conversion of the position vector
-				v3f pf(p.X, p.Y, p.Z);
-				// Center point of face (kind of)
-				v3f sp = pf - ((f32)continuous_materials_count / 2. - 0.5) * translate_dir_f;
-				v3f scale(1,1,1);
-				if(translate_dir.X != 0){
-					scale.X = continuous_materials_count;
-				}
-				if(translate_dir.Y != 0){
-					scale.Y = continuous_materials_count;
-				}
-				if(translate_dir.Z != 0){
-					scale.Z = continuous_materials_count;
-				}
-				
-				FastFace *f;
-
-				// If node at sp (material0) is more solid
-				if(mf == 1)
-				{
-					f = makeFastFace(material0, light,
-							sp, face_dir_f, scale,
-							posRelative_f);
-				}
-				// If node at sp is less solid (mf == 2)
-				else
-				{
-					f = makeFastFace(material1, light,
-							sp+face_dir_f, -1*face_dir_f, scale,
-							posRelative_f);
-				}
-				dest.push_back(f);
-			}
-
-			continuous_materials_count = 0;
-			material0 = material0_next;
-			material1 = material1_next;
-			light = light_next;
-		}
-		
-		p = p_next;
+	if (data == NULL) {
+		if (is_valid_position)
+			*is_valid_position = false;
+		return MapNode(CONTENT_IGNORE);
 	}
+	if (is_valid_position)
+		*is_valid_position = true;
+	return data[p.Z * zstride + p.Y * ystride + p.X];
 }
 
-/*
-	This is used because CMeshBuffer::append() is very slow
-*/
-struct PreMeshBuffer
+std::string MapBlock::getModifiedReasonString()
 {
-	video::SMaterial material;
-	core::array<u16> indices;
-	core::array<video::S3DVertex> vertices;
-};
+	std::string reason;
 
-class MeshCollector
-{
-public:
-	void append(
-			video::SMaterial material,
-			const video::S3DVertex* const vertices,
-			u32 numVertices,
-			const u16* const indices,
-			u32 numIndices
-		)
-	{
-		PreMeshBuffer *p = NULL;
-		for(u32 i=0; i<m_prebuffers.size(); i++)
-		{
-			PreMeshBuffer &pp = m_prebuffers[i];
-			if(pp.material != material)
-				continue;
+	const u32 ubound = MYMIN(sizeof(m_modified_reason) * CHAR_BIT,
+		ARRLEN(modified_reason_strings));
 
-			p = &pp;
-			break;
-		}
-
-		if(p == NULL)
-		{
-			PreMeshBuffer pp;
-			pp.material = material;
-			m_prebuffers.push_back(pp);
-			p = &m_prebuffers[m_prebuffers.size()-1];
-		}
-
-		u32 vertex_count = p->vertices.size();
-		for(u32 i=0; i<numIndices; i++)
-		{
-			u32 j = indices[i] + vertex_count;
-			if(j > 65535)
-			{
-				dstream<<"FIXME: Meshbuffer ran out of indices"<<std::endl;
-				// NOTE: Fix is to just add an another MeshBuffer
-			}
-			p->indices.push_back(j);
-		}
-		for(u32 i=0; i<numVertices; i++)
-		{
-			p->vertices.push_back(vertices[i]);
-		}
-	}
-
-	void fillMesh(scene::SMesh *mesh)
-	{
-		/*dstream<<"Filling mesh with "<<m_prebuffers.size()
-				<<" meshbuffers"<<std::endl;*/
-		for(u32 i=0; i<m_prebuffers.size(); i++)
-		{
-			PreMeshBuffer &p = m_prebuffers[i];
+	for (u32 i = 0; i != ubound; i++) {
+		if ((m_modified_reason & (1 << i)) == 0)
+			continue;
 
-			/*dstream<<"p.vertices.size()="<<p.vertices.size()
-					<<", p.indices.size()="<<p.indices.size()
-					<<std::endl;*/
-			
-			// Create meshbuffer
-			
-			// This is a "Standard MeshBuffer",
-			// it's a typedeffed CMeshBuffer<video::S3DVertex>
-			scene::SMeshBuffer *buf = new scene::SMeshBuffer();
-			// Set material
-			buf->Material = p.material;
-			//((scene::SMeshBuffer*)buf)->Material = p.material;
-			// Use VBO
-			//buf->setHardwareMappingHint(scene::EHM_STATIC);
-			// Add to mesh
-			mesh->addMeshBuffer(buf);
-			// Mesh grabbed it
-			buf->drop();
-
-			buf->append(p.vertices.pointer(), p.vertices.size(),
-					p.indices.pointer(), p.indices.size());
-		}
+		reason += modified_reason_strings[i];
+		reason += ", ";
 	}
 
-private:
-	core::array<PreMeshBuffer> m_prebuffers;
-};
-
-void MapBlock::updateMesh()
-{
-	/*v3s16 p = getPosRelative();
-	std::cout<<"MapBlock("<<p.X<<","<<p.Y<<","<<p.Z<<")"
-			<<"::updateMesh(): ";*/
-			//<<"::updateMesh()"<<std::endl;
-	
-	/*
-		TODO: Change this to directly generate the mesh (and get rid
-		      of FastFaces)
-	*/
-
-	core::list<FastFace*> *fastfaces_new = new core::list<FastFace*>;
-	
-	/*
-		We are including the faces of the trailing edges of the block.
-		This means that when something changes, the caller must
-		also update the meshes of the blocks at the leading edges.
-	*/
+	if (reason.length() > 2)
+		reason.resize(reason.length() - 2);
 
-	/*
-		Go through every y,z and get top faces in rows of x+
-	*/
-	for(s16 y=0; y<MAP_BLOCKSIZE; y++){
-	//for(s16 y=-1; y<MAP_BLOCKSIZE; y++){
-		for(s16 z=0; z<MAP_BLOCKSIZE; z++){
-			updateFastFaceRow(v3s16(0,y,z), MAP_BLOCKSIZE,
-					v3s16(1,0,0),
-					v3s16(0,1,0),
-					*fastfaces_new);
-		}
-	}
-	/*
-		Go through every x,y and get right faces in rows of z+
-	*/
-	for(s16 x=0; x<MAP_BLOCKSIZE; x++){
-	//for(s16 x=-1; x<MAP_BLOCKSIZE; x++){
-		for(s16 y=0; y<MAP_BLOCKSIZE; y++){
-			updateFastFaceRow(v3s16(x,y,0), MAP_BLOCKSIZE,
-					v3s16(0,0,1),
-					v3s16(1,0,0),
-					*fastfaces_new);
-		}
-	}
-	/*
-		Go through every y,z and get back faces in rows of x+
-	*/
-	for(s16 z=0; z<MAP_BLOCKSIZE; z++){
-	//for(s16 z=-1; z<MAP_BLOCKSIZE; z++){
-		for(s16 y=0; y<MAP_BLOCKSIZE; y++){
-			updateFastFaceRow(v3s16(0,y,z), MAP_BLOCKSIZE,
-					v3s16(1,0,0),
-					v3s16(0,0,1),
-					*fastfaces_new);
-		}
-	}
-
-	scene::SMesh *mesh_new = NULL;
-	
-	if(fastfaces_new->getSize() > 0)
-	{
-		MeshCollector collector;
-
-		core::list<FastFace*>::Iterator i = fastfaces_new->begin();
-
-		for(; i != fastfaces_new->end(); i++)
-		{
-			FastFace *f = *i;
-
-			const u16 indices[] = {0,1,2,2,3,0};
-
-			collector.append(g_materials[f->material], f->vertices, 4,
-					indices, 6);
-		}
-
-		mesh_new = new scene::SMesh();
-		
-		collector.fillMesh(mesh_new);
-
-#if 0
-		scene::IMeshBuffer *buf = NULL;
-
-		core::list<FastFace*>::Iterator i = fastfaces_new->begin();
-
-		// MATERIAL_AIR shouldn't be used by any face
-		u8 material_in_use = MATERIAL_AIR;
-
-		for(; i != fastfaces_new->end(); i++)
-		{
-			FastFace *f = *i;
-			
-			if(f->material != material_in_use || buf == NULL)
-			{
-				// Try to get a meshbuffer associated with the material
-				buf = mesh_new->getMeshBuffer(g_materials[f->material]);
-				// If not found, create one
-				if(buf == NULL)
-				{
-					// This is a "Standard MeshBuffer",
-					// it's a typedeffed CMeshBuffer<video::S3DVertex>
-					buf = new scene::SMeshBuffer();
-					// Set material
-					((scene::SMeshBuffer*)buf)->Material = g_materials[f->material];
-					// Use VBO
-					//buf->setHardwareMappingHint(scene::EHM_STATIC);
-					// Add to mesh
-					mesh_new->addMeshBuffer(buf);
-					// Mesh grabbed it
-					buf->drop();
-				}
-				material_in_use = f->material;
-			}
-			
-			u16 new_indices[] = {0,1,2,2,3,0};
-			
-			//buf->append(f->vertices, 4, indices, 6);
-		}
-#endif
-
-		// Use VBO for mesh (this just would set this for ever buffer)
-		//mesh_new->setHardwareMappingHint(scene::EHM_STATIC);
-		
-		/*std::cout<<"MapBlock has "<<fastfaces_new->getSize()<<" faces "
-				<<"and uses "<<mesh_new->getMeshBufferCount()
-				<<" materials (meshbuffers)"<<std::endl;*/
-	}
-
-	// TODO: Get rid of the FastFace stage
-	core::list<FastFace*>::Iterator i;
-	i = fastfaces_new->begin();
-	for(; i != fastfaces_new->end(); i++)
-	{
-		delete *i;
-	}
-	fastfaces_new->clear();
-	delete fastfaces_new;
-
-	/*
-		Replace the mesh
-	*/
-
-	mesh_mutex.Lock();
-
-	scene::SMesh *mesh_old = mesh;
-
-	mesh = mesh_new;
-	
-	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);
-		}*/
-		// Drop the mesh
-		mesh_old->drop();
-		//delete mesh_old;
-	}
-
-	mesh_mutex.Unlock();
-	
-	//std::cout<<"added "<<fastfaces.getSize()<<" faces."<<std::endl;
+	return reason;
 }
 
 /*
 	Propagates sunlight down through the block.
 	Doesn't modify nodes that are not affected by sunlight.
-	
-	Returns false if sunlight at bottom block is invalid
+
+	Returns false if sunlight at bottom block is invalid.
+	Returns true if sunlight at bottom block is valid.
 	Returns true if bottom block doesn't exist.
 
 	If there is a block above, continues from it.
 	If there is no block above, assumes there is sunlight, unless
-	is_underground is set.
+	is_underground is set or highest node is water.
+
+	All sunlighted nodes are added to light_sources.
+
+	if remove_light==true, sets non-sunlighted nodes black.
 
-	At the moment, all sunlighted nodes are added to light_sources.
-	TODO: This could be optimized.
+	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;
-	
+
 	v3s16 pos_relative = getPosRelative();
-	
+
 	for(s16 x=0; x<MAP_BLOCKSIZE; x++)
 	{
 		for(s16 z=0; z<MAP_BLOCKSIZE; z++)
 		{
+#if 1
 			bool no_sunlight = false;
-			bool no_top_block = false;
+			//bool no_top_block = false;
+
 			// Check if node above block has sunlight
-			try{
-				MapNode n = getNodeParent(v3s16(x, MAP_BLOCKSIZE, z));
-				if(n.getLight() != LIGHT_SUN)
+
+			bool is_valid_position;
+			MapNode n = getNodeParent(v3s16(x, MAP_BLOCKSIZE, z),
+				&is_valid_position);
+			if (is_valid_position)
+			{
+				if(n.getContent() == CONTENT_IGNORE)
+				{
+					// Trust heuristics
+					no_sunlight = is_underground;
+				}
+				else if(n.getLight(LIGHTBANK_DAY, m_gamedef->ndef()) != LIGHT_SUN)
 				{
-					/*if(is_underground)
-					{
-						no_sunlight = true;
-					}*/
 					no_sunlight = true;
 				}
 			}
-			catch(InvalidPositionException &e)
+			else
 			{
-				no_top_block = true;
-				
-				// TODO: This makes over-ground roofed places sunlighted
+				//no_top_block = true;
+
+				// NOTE: This makes over-ground roofed places sunlighted
 				// Assume sunlight, unless is_underground==true
 				if(is_underground)
 				{
 					no_sunlight = true;
 				}
-				
-				// TODO: There has to be some way to allow this behaviour
-				// As of now, it just makes everything dark.
+				else
+				{
+					MapNode n = getNodeNoEx(v3s16(x, MAP_BLOCKSIZE-1, z));
+					if(m_gamedef->ndef()->get(n).sunlight_propagates == false)
+					{
+						no_sunlight = true;
+					}
+				}
+				// NOTE: As of now, this just would make everything dark.
 				// No sunlight here
 				//no_sunlight = true;
 			}
+#endif
+#if 0 // Doesn't work; nothing gets light.
+			bool no_sunlight = true;
+			bool no_top_block = false;
+			// Check if node above block has sunlight
+			try{
+				MapNode n = getNodeParent(v3s16(x, MAP_BLOCKSIZE, z));
+				if(n.getLight(LIGHTBANK_DAY) == LIGHT_SUN)
+				{
+					no_sunlight = false;
+				}
+			}
+			catch(InvalidPositionException &e)
+			{
+				no_top_block = true;
+			}
+#endif
 
 			/*std::cout<<"("<<x<<","<<z<<"): "
 					<<"no_top_block="<<no_top_block
 					<<", is_underground="<<is_underground
 					<<", no_sunlight="<<no_sunlight
 					<<std::endl;*/
-		
+
 			s16 y = MAP_BLOCKSIZE-1;
-			
-			if(no_sunlight == false)
+
+			// This makes difference to diminishing in water.
+			bool stopped_to_solid_object = false;
+
+			u8 current_light = no_sunlight ? 0 : LIGHT_SUN;
+
+			for(; y >= 0; y--)
 			{
-				// Continue spreading sunlight downwards through transparent
-				// nodes
-				for(; y >= 0; y--)
-				{
-					v3s16 pos(x, y, z);
-					
-					MapNode &n = getNodeRef(pos);
+				v3s16 pos(x, y, z);
+				MapNode &n = getNodeRef(pos);
 
-					if(n.sunlight_propagates())
-					{
-						n.setLight(LIGHT_SUN);
+				if(current_light == 0)
+				{
+					// Do nothing
+				}
+				else if(current_light == LIGHT_SUN && nodemgr->get(n).sunlight_propagates)
+				{
+					// Do nothing: Sunlight is continued
+				}
+				else if(nodemgr->get(n).light_propagates == false)
+				{
+					// A solid object is on the way.
+					stopped_to_solid_object = true;
 
-						light_sources.insert(pos_relative + pos, true);
-					}
-					else{
-						break;
-					}
+					// Light stops.
+					current_light = 0;
+				}
+				else
+				{
+					// Diminish light
+					current_light = diminish_light(current_light);
 				}
-			}
 
-			bool sunlight_should_go_down = (y==-1);
+				u8 old_light = n.getLight(LIGHTBANK_DAY, nodemgr);
 
-			// Fill rest with black (only transparent ones)
-			for(; y >= 0; y--){
-				v3s16 pos(x, y, z);
-				
-				MapNode &n = getNodeRef(pos);
+				if(current_light > old_light || remove_light)
+				{
+					n.setLight(LIGHTBANK_DAY, current_light, nodemgr);
+				}
 
-				if(n.light_propagates())
+				if(diminish_light(current_light) != 0)
 				{
-					n.setLight(0);
+					light_sources.insert(pos_relative + pos);
 				}
-				else{
-					break;
+
+				if(current_light == 0 && stopped_to_solid_object)
+				{
+					if(black_air_left)
+					{
+						*black_air_left = true;
+					}
 				}
 			}
 
+			// Whether or not the block below should see LIGHT_SUN
+			bool sunlight_should_go_down = (current_light == LIGHT_SUN);
+
 			/*
 				If the block below hasn't already been marked invalid:
 
 				Check if the node below the block has proper sunlight at top.
 				If not, the block below is invalid.
-				
+
 				Ignore non-transparent nodes as they always have no light
 			*/
-			try
-			{
+
 			if(block_below_is_valid)
 			{
-				MapNode n = getNodeParent(v3s16(x, -1, z));
-				if(n.light_propagates())
+				MapNode n = getNodeParent(v3s16(x, -1, z), &is_valid_position);
+				if (is_valid_position) {
+					if(nodemgr->get(n).light_propagates)
+					{
+						if(n.getLight(LIGHTBANK_DAY, nodemgr) == LIGHT_SUN
+								&& sunlight_should_go_down == false)
+							block_below_is_valid = false;
+						else if(n.getLight(LIGHTBANK_DAY, nodemgr) != LIGHT_SUN
+								&& sunlight_should_go_down == true)
+							block_below_is_valid = false;
+					}
+				}
+				else
 				{
-					if(n.getLight() == LIGHT_SUN
-							&& sunlight_should_go_down == false)
-						block_below_is_valid = false;
-					else if(n.getLight() != LIGHT_SUN
-							&& sunlight_should_go_down == true)
-						block_below_is_valid = false;
+					/*std::cout<<"InvalidBlockException for bottom block node"
+							<<std::endl;*/
+					// Just no block below, no need to panic.
 				}
-			}//if
-			}//try
-			catch(InvalidPositionException &e)
-			{
-				/*std::cout<<"InvalidBlockException for bottom block node"
-						<<std::endl;*/
-				// Just no block below, no need to panic.
 			}
 		}
 	}
@@ -696,121 +350,466 @@ bool MapBlock::propagateSunlight(core::map<v3s16, bool> & light_sources)
 	return block_below_is_valid;
 }
 
+
 void MapBlock::copyTo(VoxelManipulator &dst)
 {
 	v3s16 data_size(MAP_BLOCKSIZE, MAP_BLOCKSIZE, MAP_BLOCKSIZE);
 	VoxelArea data_area(v3s16(0,0,0), data_size - v3s16(1,1,1));
-	
+
+	// Copy from data to VoxelManipulator
 	dst.copyFrom(data, data_area, v3s16(0,0,0),
 			getPosRelative(), data_size);
 }
 
+void MapBlock::copyFrom(VoxelManipulator &dst)
+{
+	v3s16 data_size(MAP_BLOCKSIZE, MAP_BLOCKSIZE, MAP_BLOCKSIZE);
+	VoxelArea data_area(v3s16(0,0,0), data_size - v3s16(1,1,1));
+
+	// Copy from VoxelManipulator to data
+	dst.copyTo(data, data_area, v3s16(0,0,0),
+			getPosRelative(), data_size);
+}
+
+void MapBlock::actuallyUpdateDayNightDiff()
+{
+	INodeDefManager *nodemgr = m_gamedef->ndef();
+
+	// Running this function un-expires m_day_night_differs
+	m_day_night_differs_expired = false;
+
+	if (data == NULL) {
+		m_day_night_differs = false;
+		return;
+	}
+
+	bool differs;
+
+	/*
+		Check if any lighting value differs
+	*/
+	for (u32 i = 0; i < nodecount; i++) {
+		MapNode &n = data[i];
+
+		differs = !n.isLightDayNightEq(nodemgr);
+		if (differs)
+			break;
+	}
+
+	/*
+		If some lighting values differ, check if the whole thing is
+		just air. If it is just air, differs = false
+	*/
+	if (differs) {
+		bool only_air = true;
+		for (u32 i = 0; i < nodecount; i++) {
+			MapNode &n = data[i];
+			if (n.getContent() != CONTENT_AIR) {
+				only_air = false;
+				break;
+			}
+		}
+		if (only_air)
+			differs = false;
+	}
+
+	// Set member variable
+	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())
+		return -3;
+	try
+	{
+		s16 y = MAP_BLOCKSIZE-1;
+		for(; y>=0; y--)
+		{
+			MapNode n = getNodeRef(p2d.X, y, p2d.Y);
+			if(m_gamedef->ndef()->get(n).walkable)
+			{
+				if(y == MAP_BLOCKSIZE-1)
+					return -2;
+				else
+					return y;
+			}
+		}
+		return -1;
+	}
+	catch(InvalidPositionException &e)
+	{
+		return -3;
+	}
+}
+
 /*
 	Serialization
 */
+// List relevant id-name pairs for ids in the block using nodedef
+// Renumbers the content IDs (starting at 0 and incrementing
+// use static memory requires about 65535 * sizeof(int) ram in order to be
+// sure we can handle all content ids. But it's absolutely worth it as it's
+// a speedup of 4 for one of the major time consuming functions on storing
+// mapblocks.
+static content_t getBlockNodeIdMapping_mapping[USHRT_MAX + 1];
+static void getBlockNodeIdMapping(NameIdMapping *nimap, MapNode *nodes,
+		INodeDefManager *nodedef)
+{
+	memset(getBlockNodeIdMapping_mapping, 0xFF, (USHRT_MAX + 1) * sizeof(content_t));
 
-void MapBlock::serialize(std::ostream &os, u8 version)
+	std::set<content_t> unknown_contents;
+	content_t id_counter = 0;
+	for (u32 i = 0; i < MapBlock::nodecount; i++) {
+		content_t global_id = nodes[i].getContent();
+		content_t id = CONTENT_IGNORE;
+
+		// Try to find an existing mapping
+		if (getBlockNodeIdMapping_mapping[global_id] != 0xFFFF) {
+			id = getBlockNodeIdMapping_mapping[global_id];
+		}
+		else
+		{
+			// We have to assign a new mapping
+			id = id_counter++;
+			getBlockNodeIdMapping_mapping[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 < MapBlock::nodecount; 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");
-	
+
 	if(data == NULL)
 	{
 		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;
-		
-		u32 buflen = 1 + nodecount * MapNode::serializedLength(version);
-		SharedBuffer<u8> dest(buflen);
 
-		dest[0] = is_underground;
+	FATAL_ERROR_IF(version < SER_FMT_VER_LOWEST_WRITE, "Serialisation version error");
+
+	// First byte
+	u8 flags = 0;
+	if(is_underground)
+		flags |= 0x01;
+	if(getDayNightDiff())
+		flags |= 0x02;
+	if(m_generated == false)
+		flags |= 0x08;
+	writeU8(os, flags);
+	if (version >= 27) {
+		writeU16(os, m_lighting_complete);
+	}
+
+	/*
+		Bulk node data
+	*/
+	NameIdMapping nimap;
+	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;
 	}
-	// All otherversions
 	else
 	{
-		/*
-			With compression.
-			Compress the materials and the params separately.
-		*/
-		
-		// First byte
-		os.write((char*)&is_underground, 1);
+		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);
+	}
 
-		u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
+	/*
+		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 params
-		SharedBuffer<u8> paramdata(nodecount);
-		for(u32 i=0; i<nodecount; i++)
-		{
-			paramdata[i] = data[i].param;
-		}
-		compress(paramdata, os, version);
-		
-		if(version >= 10)
-		{
-			// Get and compress pressure
-			SharedBuffer<u8> pressuredata(nodecount);
-			for(u32 i=0; i<nodecount; i++)
-			{
-				pressuredata[i] = data[i].pressure;
-			}
-			compress(pressuredata, 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 >= 25){
+			// Node timers
+			m_node_timers.serialize(os, version);
 		}
 	}
 }
 
-void MapBlock::deSerialize(std::istream &is, u8 version)
+void MapBlock::serializeNetworkSpecific(std::ostream &os, u16 net_proto_version)
+{
+	if(data == NULL)
+	{
+		throw SerializationError("ERROR: Not writing dummy block.");
+	}
+
+	if(net_proto_version >= 21){
+		int version = 1;
+		writeU8(os, version);
+		writeF1000(os, 0); // deprecated heat
+		writeF1000(os, 0); // deprecated humidity
+	}
+}
+
+void MapBlock::deSerialize(std::istream &is, u8 version, bool disk)
 {
 	if(!ser_ver_supported(version))
 		throw VersionMismatchException("ERROR: MapBlock format not supported");
 
-	// These have no compression
-	if(version <= 3 || version == 5 || version == 6)
+	TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())<<std::endl);
+
+	m_day_night_differs_expired = false;
+
+	if(version <= 21)
 	{
-		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);
+		deSerialize_pre22(is, version, disk);
+		return;
+	}
+
+	u8 flags = readU8(is);
+	is_underground = (flags & 0x01) ? true : false;
+	m_day_night_differs = (flags & 0x02) ? true : false;
+	if (version < 27) {
+		m_lighting_complete = 0xFFFF;
+	} else {
+		m_lighting_complete = readU16(is);
+	}
+	m_generated = (flags & 0x08) ? false : true;
+
+	/*
+		Bulk node data
+	*/
+	TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
+			<<": Bulk node data"<<std::endl);
+	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);
+
+	/*
+		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->idef());
+		else
+			content_nodemeta_deserialize_legacy(iss,
+				&m_node_metadata, &m_node_timers,
+				m_gamedef->idef());
+	} catch(SerializationError &e) {
+		warningstream<<"MapBlock::deSerialize(): Ignoring an error"
+				<<" while deserializing node metadata at ("
+				<<PP(getPos())<<": "<<e.what()<<std::endl;
+	}
+
+	/*
+		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);
+		}
+
+		// Static objects
+		TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
+				<<": Static objects"<<std::endl);
+		m_static_objects.deSerialize(is);
+
+		// 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);
 		}
 	}
-	// All other versions
-	else
+
+	TRACESTREAM(<<"MapBlock::deSerialize "<<PP(getPos())
+			<<": Done."<<std::endl);
+}
+
+void MapBlock::deSerializeNetworkSpecific(std::istream &is)
+{
+	try {
+		int version = readU8(is);
+		//if(version != 1)
+		//	throw SerializationError("unsupported MapBlock version");
+		if(version >= 1) {
+			readF1000(is); // deprecated heat
+			readF1000(is); // deprecated humidity
+		}
+	}
+	catch(SerializationError &e)
 	{
-		u32 nodecount = MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE;
+		warningstream<<"MapBlock::deSerializeNetworkSpecific(): Ignoring an error"
+				<<": "<<e.what()<<std::endl;
+	}
+}
+
+/*
+	Legacy serialization
+*/
+
+void MapBlock::deSerialize_pre22(std::istream &is, u8 version, bool disk)
+{
+	// Initialize default flags
+	is_underground = false;
+	m_day_night_differs = false;
+	m_lighting_complete = 0xFFFF;
+	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) {
+		char tmp;
+		is.read(&tmp, 1);
+		if (is.gcount() != 1)
+			throw SerializationError(std::string(FUNCTION_NAME)
+				+ ": not enough input data");
+		is_underground = tmp;
+		is.read((char *)*databuf_nodelist, nodecount * ser_length);
+		if ((u32)is.gcount() != nodecount * ser_length)
+			throw SerializationError(std::string(FUNCTION_NAME)
+				+ ": not enough input data");
+	} else if (version <= 10) {
 		u8 t8;
-		is.read((char*)&t8, 1);
+		is.read((char *)&t8, 1);
 		is_underground = t8;
 
 		{
@@ -818,12 +817,11 @@ void MapBlock::deSerialize(std::istream &is, u8 version)
 			std::ostringstream os(std::ios_base::binary);
 			decompress(is, os, version);
 			std::string s = os.str();
-			if(s.size() != nodecount)
-				throw SerializationError
-						("MapBlock::deSerialize: invalid format");
-			for(u32 i=0; i<s.size(); i++)
-			{
-				data[i].d = s[i];
+			if (s.size() != nodecount)
+				throw SerializationError(std::string(FUNCTION_NAME)
+					+ ": not enough input data");
+			for (u32 i = 0; i < s.size(); i++) {
+				databuf_nodelist[i*ser_length] = s[i];
 			}
 		}
 		{
@@ -831,30 +829,258 @@ void MapBlock::deSerialize(std::istream &is, u8 version)
 			std::ostringstream os(std::ios_base::binary);
 			decompress(is, os, version);
 			std::string s = os.str();
-			if(s.size() != nodecount)
-				throw SerializationError
-						("MapBlock::deSerialize: invalid format");
-			for(u32 i=0; i<s.size(); i++)
-			{
-				data[i].param = s[i];
+			if (s.size() != nodecount)
+				throw SerializationError(std::string(FUNCTION_NAME)
+					+ ": not enough input data");
+			for (u32 i = 0; i < s.size(); i++) {
+				databuf_nodelist[i*ser_length + 1] = s[i];
 			}
 		}
-	
-		if(version >= 10)
-		{
-			// Uncompress and set pressure data
+
+		if (version >= 10) {
+			// Uncompress and set param2 data
 			std::ostringstream os(std::ios_base::binary);
 			decompress(is, os, version);
 			std::string s = os.str();
-			if(s.size() != nodecount)
-				throw SerializationError
-						("MapBlock::deSerialize: invalid format");
-			for(u32 i=0; i<s.size(); i++)
+			if (s.size() != nodecount)
+				throw SerializationError(std::string(FUNCTION_NAME)
+					+ ": not enough input data");
+			for (u32 i = 0; i < s.size(); i++) {
+				databuf_nodelist[i*ser_length + 2] = s[i];
+			}
+		}
+	} else { // All other versions (10 to 21)
+		u8 flags;
+		is.read((char*)&flags, 1);
+		is_underground = (flags & 0x01) ? true : false;
+		m_day_night_differs = (flags & 0x02) ? true : false;
+		if(version >= 18)
+			m_generated = (flags & 0x08) ? false : true;
+
+		// Uncompress data
+		std::ostringstream os(std::ios_base::binary);
+		decompress(is, os, version);
+		std::string s = os.str();
+		if (s.size() != nodecount * 3)
+			throw SerializationError(std::string(FUNCTION_NAME)
+				+ ": decompress resulted in size other than nodecount*3");
+
+		// deserialize nodes from buffer
+		for (u32 i = 0; i < nodecount; i++) {
+			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];
+		}
+
+		/*
+			NodeMetadata
+		*/
+		if (version >= 14) {
+			// Ignore errors
+			try {
+				if (version <= 15) {
+					std::string data = deSerializeString(is);
+					std::istringstream iss(data, std::ios_base::binary);
+					content_nodemeta_deserialize_legacy(iss,
+						&m_node_metadata, &m_node_timers,
+						m_gamedef->idef());
+				} else {
+					//std::string data = deSerializeLongString(is);
+					std::ostringstream oss(std::ios_base::binary);
+					decompressZlib(is, oss);
+					std::istringstream iss(oss.str(), std::ios_base::binary);
+					content_nodemeta_deserialize_legacy(iss,
+						&m_node_metadata, &m_node_timers,
+						m_gamedef->idef());
+				}
+			} catch(SerializationError &e) {
+				warningstream<<"MapBlock::deSerialize(): Ignoring an error"
+						<<" while deserializing node metadata"<<std::endl;
+			}
+		}
+	}
+
+	// Deserialize node data
+	for (u32 i = 0; i < nodecount; i++) {
+		data[i].deSerialize(&databuf_nodelist[i * ser_length], version);
+	}
+
+	if (disk) {
+		/*
+			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){
+				warningstream<<"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);
+	}
+
+
+	// 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++)
+	{
+		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++)
 			{
-				data[i].pressure = s[i];
+				if((dir_old_format & wallmounted_new_to_old[j]) != 0)
+				{
+					dir_new_format = j;
+					break;
+				}
 			}
+			data[i].setParam2(dir_new_format);
 		}
 	}
+
+}
+
+/*
+	Get a quick string to describe what a block actually contains
+*/
+std::string analyze_block(MapBlock *block)
+{
+	if(block == NULL)
+		return "NULL";
+
+	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())
+	{
+	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())+", ";
+	}
+
+	if(block->isGenerated())
+		desc<<"is_gen [X], ";
+	else
+		desc<<"is_gen [ ], ";
+
+	if(block->getIsUnderground())
+		desc<<"is_ug [X], ";
+	else
+		desc<<"is_ug [ ], ";
+
+	desc<<"lighting_complete: "<<block->getLightingComplete()<<", ";
+
+	if(block->isDummy())
+	{
+		desc<<"Dummy, ";
+	}
+	else
+	{
+		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->getNodeNoEx(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);
 }