Split up mapgen.cpp

20 files changed, 1178 insertions, 962 deletions

diff --git a/build/android/jni/Android.mk b/build/android/jni/Android.mk
index 96693fa4d..335802d85 100644
--- a/build/android/jni/Android.mk
+++ b/build/android/jni/Android.mk
@@ -102,7 +102,6 @@ LOCAL_C_INCLUDES :=                               \
 LOCAL_SRC_FILES :=                                \
 		jni/src/ban.cpp                           \
 		jni/src/base64.cpp                        \
-		jni/src/biome.cpp                         \
 		jni/src/camera.cpp                        \
 		jni/src/cavegen.cpp                       \
 		jni/src/chat.cpp                          \
@@ -165,6 +164,10 @@ LOCAL_SRC_FILES :=                                \
 		jni/src/mapnode.cpp                       \
 		jni/src/mapsector.cpp                     \
 		jni/src/mesh.cpp                          \
+		jni/src/mg_biome.cpp                      \
+		jni/src/mg_decoration.cpp                 \
+		jni/src/mg_ore.cpp                        \
+		jni/src/mg_schematic.cpp                  \
 		jni/src/mods.cpp                          \
 		jni/src/nameidmapping.cpp                 \
 		jni/src/nodedef.cpp                       \
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 4c1522fac..5de5834d3 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -335,7 +335,6 @@ add_subdirectory(util)
 set(common_SRCS
 	ban.cpp
 	base64.cpp
-	biome.cpp
 	cavegen.cpp
 	clientiface.cpp
 	collision.cpp
@@ -373,6 +372,10 @@ set(common_SRCS
 	mapgen_v7.cpp
 	mapnode.cpp
 	mapsector.cpp
+	mg_biome.cpp
+	mg_decoration.cpp
+	mg_ore.cpp
+	mg_schematic.cpp
 	mods.cpp
 	nameidmapping.cpp
 	nodedef.cpp
diff --git a/src/emerge.cpp b/src/emerge.cpp
index a4b0752e5..fc0193656 100644
--- a/src/emerge.cpp
+++ b/src/emerge.cpp
@@ -39,7 +39,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "profiler.h"
 #include "log.h"
 #include "nodedef.h"
-#include "biome.h"
+#include "mg_biome.h"
 #include "mapgen_v6.h"
 #include "mapgen_v7.h"
 #include "mapgen_singlenode.h"
diff --git a/src/emerge.h b/src/emerge.h
index b4c8e9ffd..c8b99a6e1 100644
--- a/src/emerge.h
+++ b/src/emerge.h
@@ -38,8 +38,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 	infostream << "EmergeThread: " x << std::endl; }
 
 class EmergeThread;
-//class Mapgen;
-//struct MapgenFactory;
 class Biome;
 class BiomeDefManager;
 class Decoration;
diff --git a/src/map.cpp b/src/map.cpp
index 1fe0ca9ad..7903f3050 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -37,7 +37,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "environment.h"
 #include "emerge.h"
 #include "mapgen_v6.h"
-#include "biome.h"
+#include "mg_biome.h"
 #include "config.h"
 #include "server.h"
 #include "database.h"
diff --git a/src/mapgen.cpp b/src/mapgen.cpp
index 11f76984d..3627675dc 100644
--- a/src/mapgen.cpp
+++ b/src/mapgen.cpp
@@ -20,7 +20,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "mapgen.h"
 #include "voxel.h"
 #include "noise.h"
-#include "biome.h"
+#include "mg_biome.h"
 #include "mapblock.h"
 #include "mapnode.h"
 #include "map.h"
@@ -32,8 +32,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "settings.h" // For g_settings
 #include "main.h" // For g_profiler
 #include "treegen.h"
-#include "mapgen_v6.h"
-#include "mapgen_v7.h"
 #include "serialization.h"
 #include "util/serialize.h"
 #include "filesys.h"
@@ -49,20 +47,6 @@ FlagDesc flagdesc_mapgen[] = {
 	{NULL,       0}
 };
 
-FlagDesc flagdesc_ore[] = {
-	{"absheight",            OREFLAG_ABSHEIGHT},
-	{"scatter_noisedensity", OREFLAG_DENSITY},
-	{"claylike_nodeisnt",    OREFLAG_NODEISNT},
-	{NULL,                   0}
-};
-
-FlagDesc flagdesc_deco_schematic[] = {
-	{"place_center_x", DECO_PLACE_CENTER_X},
-	{"place_center_y", DECO_PLACE_CENTER_Y},
-	{"place_center_z", DECO_PLACE_CENTER_Z},
-	{NULL,             0}
-};
-
 FlagDesc flagdesc_gennotify[] = {
 	{"dungeon",          1 << GENNOTIFY_DUNGEON},
 	{"temple",           1 << GENNOTIFY_TEMPLE},
@@ -76,759 +60,12 @@ FlagDesc flagdesc_gennotify[] = {
 ///////////////////////////////////////////////////////////////////////////////
 
 
-Ore *createOre(OreType type) {
-	switch (type) {
-		case ORE_SCATTER:
-			return new OreScatter;
-		case ORE_SHEET:
-			return new OreSheet;
-		//case ORE_CLAYLIKE: //TODO: implement this!
-		//	return new OreClaylike;
-		default:
-			return NULL;
-	}
-}
-
-
-Ore::~Ore() {
-	delete np;
-	delete noise;
-}
-
-
-void Ore::placeOre(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax) {
-	int in_range = 0;
-
-	in_range |= (nmin.Y <= height_max && nmax.Y >= height_min);
-	if (flags & OREFLAG_ABSHEIGHT)
-		in_range |= (nmin.Y >= -height_max && nmax.Y <= -height_min) << 1;
-	if (!in_range)
-		return;
-
-	int ymin, ymax;
-	if (in_range & ORE_RANGE_MIRROR) {
-		ymin = MYMAX(nmin.Y, -height_max);
-		ymax = MYMIN(nmax.Y, -height_min);
-	} else {
-		ymin = MYMAX(nmin.Y, height_min);
-		ymax = MYMIN(nmax.Y, height_max);
-	}
-	if (clust_size >= ymax - ymin + 1)
-		return;
-
-	nmin.Y = ymin;
-	nmax.Y = ymax;
-	generate(mg->vm, mg->seed, blockseed, nmin, nmax);
-}
-
-
-void OreScatter::generate(ManualMapVoxelManipulator *vm, int seed,
-						  u32 blockseed, v3s16 nmin, v3s16 nmax) {
-	PseudoRandom pr(blockseed);
-	MapNode n_ore(c_ore, 0, ore_param2);
-
-	int volume = (nmax.X - nmin.X + 1) *
-				 (nmax.Y - nmin.Y + 1) *
-				 (nmax.Z - nmin.Z + 1);
-	int csize     = clust_size;
-	int orechance = (csize * csize * csize) / clust_num_ores;
-	int nclusters = volume / clust_scarcity;
-
-	for (int i = 0; i != nclusters; i++) {
-		int x0 = pr.range(nmin.X, nmax.X - csize + 1);
-		int y0 = pr.range(nmin.Y, nmax.Y - csize + 1);
-		int z0 = pr.range(nmin.Z, nmax.Z - csize + 1);
-
-		if (np && (NoisePerlin3D(np, x0, y0, z0, seed) < nthresh))
-			continue;
-
-		for (int z1 = 0; z1 != csize; z1++)
-		for (int y1 = 0; y1 != csize; y1++)
-		for (int x1 = 0; x1 != csize; x1++) {
-			if (pr.range(1, orechance) != 1)
-				continue;
-
-			u32 i = vm->m_area.index(x0 + x1, y0 + y1, z0 + z1);
-			if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
-				continue;
-
-			vm->m_data[i] = n_ore;
-		}
-	}
-}
-
-
-void OreSheet::generate(ManualMapVoxelManipulator *vm, int seed,
-						u32 blockseed, v3s16 nmin, v3s16 nmax) {
-	PseudoRandom pr(blockseed + 4234);
-	MapNode n_ore(c_ore, 0, ore_param2);
-
-	int max_height = clust_size;
-	int y_start = pr.range(nmin.Y, nmax.Y - max_height);
-
-	if (!noise) {
-		int sx = nmax.X - nmin.X + 1;
-		int sz = nmax.Z - nmin.Z + 1;
-		noise = new Noise(np, 0, sx, sz);
-	}
-	noise->seed = seed + y_start;
-	noise->perlinMap2D(nmin.X, nmin.Z);
-
-	int index = 0;
-	for (int z = nmin.Z; z <= nmax.Z; z++)
-	for (int x = nmin.X; x <= nmax.X; x++) {
-		float noiseval = noise->result[index++];
-		if (noiseval < nthresh)
-			continue;
-
-		int height = max_height * (1. / pr.range(1, 3));
-		int y0 = y_start + np->scale * noiseval; //pr.range(1, 3) - 1;
-		int y1 = y0 + height;
-		for (int y = y0; y != y1; y++) {
-			u32 i = vm->m_area.index(x, y, z);
-			if (!vm->m_area.contains(i))
-				continue;
-			if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
-				continue;
-
-			vm->m_data[i] = n_ore;
-		}
-	}
-}
-
-
-///////////////////////////////////////////////////////////////////////////////
-
-
-Decoration *createDecoration(DecorationType type) {
-	switch (type) {
-		case DECO_SIMPLE:
-			return new DecoSimple;
-		case DECO_SCHEMATIC:
-			return new DecoSchematic;
-		//case DECO_LSYSTEM:
-		//	return new DecoLSystem;
-		default:
-			return NULL;
-	}
-}
-
-
-Decoration::Decoration() {
-	mapseed    = 0;
-	np         = NULL;
-	fill_ratio = 0;
-	sidelen    = 1;
-}
-
-
-Decoration::~Decoration() {
-	delete np;
-}
-
-
-void Decoration::placeDeco(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax) {
-	PseudoRandom ps(blockseed + 53);
-	int carea_size = nmax.X - nmin.X + 1;
-
-	// Divide area into parts
-	if (carea_size % sidelen) {
-		errorstream << "Decoration::placeDeco: chunk size is not divisible by "
-			"sidelen; setting sidelen to " << carea_size << std::endl;
-		sidelen = carea_size;
-	}
-
-	s16 divlen = carea_size / sidelen;
-	int area = sidelen * sidelen;
-
-	for (s16 z0 = 0; z0 < divlen; z0++)
-	for (s16 x0 = 0; x0 < divlen; x0++) {
-		v2s16 p2d_center( // Center position of part of division
-			nmin.X + sidelen / 2 + sidelen * x0,
-			nmin.Z + sidelen / 2 + sidelen * z0
-		);
-		v2s16 p2d_min( // Minimum edge of part of division
-			nmin.X + sidelen * x0,
-			nmin.Z + sidelen * z0
-		);
-		v2s16 p2d_max( // Maximum edge of part of division
-			nmin.X + sidelen + sidelen * x0 - 1,
-			nmin.Z + sidelen + sidelen * z0 - 1
-		);
-
-		// Amount of decorations
-		float nval = np ?
-			NoisePerlin2D(np, p2d_center.X, p2d_center.Y, mapseed) :
-			fill_ratio;
-		u32 deco_count = area * MYMAX(nval, 0.f);
-
-		for (u32 i = 0; i < deco_count; i++) {
-			s16 x = ps.range(p2d_min.X, p2d_max.X);
-			s16 z = ps.range(p2d_min.Y, p2d_max.Y);
-
-			int mapindex = carea_size * (z - nmin.Z) + (x - nmin.X);
-
-			s16 y = mg->heightmap ?
-					mg->heightmap[mapindex] :
-					mg->findGroundLevel(v2s16(x, z), nmin.Y, nmax.Y);
-
-			if (y < nmin.Y || y > nmax.Y)
-				continue;
-
-			int height = getHeight();
-			int max_y = nmax.Y;// + MAP_BLOCKSIZE - 1;
-			if (y + 1 + height > max_y) {
-				continue;
-#if 0
-				printf("Decoration at (%d %d %d) cut off\n", x, y, z);
-				//add to queue
-				JMutexAutoLock cutofflock(cutoff_mutex);
-				cutoffs.push_back(CutoffData(x, y, z, height));
-#endif
-			}
-
-			if (mg->biomemap) {
-				std::set<u8>::iterator iter;
-
-				if (biomes.size()) {
-					iter = biomes.find(mg->biomemap[mapindex]);
-					if (iter == biomes.end())
-						continue;
-				}
-			}
-
-			generate(mg, &ps, max_y, v3s16(x, y, z));
-		}
-	}
-}
-
-
-#if 0
-void Decoration::placeCutoffs(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax) {
-	PseudoRandom pr(blockseed + 53);
-	std::vector<CutoffData> handled_cutoffs;
-
-	// Copy over the cutoffs we're interested in so we don't needlessly hold a lock
-	{
-		JMutexAutoLock cutofflock(cutoff_mutex);
-		for (std::list<CutoffData>::iterator i = cutoffs.begin();
-			i != cutoffs.end(); ++i) {
-			CutoffData cutoff = *i;
-			v3s16 p    = cutoff.p;
-			s16 height = cutoff.height;
-			if (p.X < nmin.X || p.X > nmax.X ||
-				p.Z < nmin.Z || p.Z > nmax.Z)
-				continue;
-			if (p.Y + height < nmin.Y || p.Y > nmax.Y)
-				continue;
-
-			handled_cutoffs.push_back(cutoff);
-		}
-	}
-
-	// Generate the cutoffs
-	for (size_t i = 0; i != handled_cutoffs.size(); i++) {
-		v3s16 p    = handled_cutoffs[i].p;
-		s16 height = handled_cutoffs[i].height;
-
-		if (p.Y + height > nmax.Y) {
-			//printf("Decoration at (%d %d %d) cut off again!\n", p.X, p.Y, p.Z);
-			cuttoffs.push_back(v3s16(p.X, p.Y, p.Z));
-		}
-
-		generate(mg, &pr, nmax.Y, nmin.Y - p.Y, v3s16(p.X, nmin.Y, p.Z));
-	}
-
-	// Remove cutoffs that were handled from the cutoff list
-	{
-		JMutexAutoLock cutofflock(cutoff_mutex);
-		for (std::list<CutoffData>::iterator i = cutoffs.begin();
-			i != cutoffs.end(); ++i) {
-
-			for (size_t j = 0; j != handled_cutoffs.size(); j++) {
-				CutoffData coff = *i;
-				if (coff.p == handled_cutoffs[j].p)
-					i = cutoffs.erase(i);
-			}
-		}
-	}
-}
-#endif
-
-
-///////////////////////////////////////////////////////////////////////////////
-
-bool DecoSimple::canPlaceDecoration(ManualMapVoxelManipulator *vm, v3s16 p) {
-	// Don't bother if there aren't any decorations to place
-	if (c_decos.size() == 0)
-		return false;
-
-	u32 vi = vm->m_area.index(p);
-
-	// Check if the decoration can be placed on this node
-	if (!CONTAINS(c_place_on, vm->m_data[vi].getContent()))
-		return false;
-
-	// Don't continue if there are no spawnby constraints
-	if (nspawnby == -1)
-		return true;
-
-	int nneighs = 0;
-	v3s16 dirs[8] = {
-		v3s16( 0, 0,  1),
-		v3s16( 0, 0, -1),
-		v3s16( 1, 0,  0),
-		v3s16(-1, 0,  0),
-		v3s16( 1, 0,  1),
-		v3s16(-1, 0,  1),
-		v3s16(-1, 0, -1),
-		v3s16( 1, 0, -1)
-	};
-
-	// Check a Moore neighborhood if there are enough spawnby nodes
-	for (size_t i = 0; i != ARRLEN(dirs); i++) {
-		u32 index = vm->m_area.index(p + dirs[i]);
-		if (!vm->m_area.contains(index))
-			continue;
-
-		if (CONTAINS(c_spawnby, vm->m_data[index].getContent()))
-			nneighs++;
-	}
-
-	if (nneighs < nspawnby)
-		return false;
-
-	return true;
-}
-
-
-void DecoSimple::generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p) {
-	ManualMapVoxelManipulator *vm = mg->vm;
-
-	if (!canPlaceDecoration(vm, p))
-		return;
-
-	content_t c_place = c_decos[pr->range(0, c_decos.size() - 1)];
-
-	s16 height = (deco_height_max > 0) ?
-		pr->range(deco_height, deco_height_max) : deco_height;
-
-	height = MYMIN(height, max_y - p.Y);
-
-	v3s16 em = vm->m_area.getExtent();
-	u32 vi = vm->m_area.index(p);
-	for (int i = 0; i < height; i++) {
-		vm->m_area.add_y(em, vi, 1);
-
-		content_t c = vm->m_data[vi].getContent();
-		if (c != CONTENT_AIR && c != CONTENT_IGNORE)
-			break;
-
-		vm->m_data[vi] = MapNode(c_place);
-	}
-}
-
-
-int DecoSimple::getHeight() {
-	return (deco_height_max > 0) ? deco_height_max : deco_height;
-}
-
 
-std::string DecoSimple::getName() {
-	return "";
-}
 
 
 ///////////////////////////////////////////////////////////////////////////////
 
 
-DecoSchematic::DecoSchematic() {
-	schematic   = NULL;
-	slice_probs = NULL;
-	flags       = 0;
-	size        = v3s16(0, 0, 0);
-}
-
-
-DecoSchematic::~DecoSchematic() {
-	delete []schematic;
-	delete []slice_probs;
-}
-
-
-void DecoSchematic::updateContentIds() {
-	if (flags & DECO_SCHEM_CIDS_UPDATED)
-		return;
-
-	flags |= DECO_SCHEM_CIDS_UPDATED;
-
-	for (int i = 0; i != size.X * size.Y * size.Z; i++)
-		schematic[i].setContent(c_nodes[schematic[i].getContent()]);
-}
-
-
-void DecoSchematic::generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p) {
-	ManualMapVoxelManipulator *vm = mg->vm;
-
-	if (flags & DECO_PLACE_CENTER_X)
-		p.X -= (size.X + 1) / 2;
-	if (flags & DECO_PLACE_CENTER_Y)
-		p.Y -= (size.Y + 1) / 2;
-	if (flags & DECO_PLACE_CENTER_Z)
-		p.Z -= (size.Z + 1) / 2;
-
-	u32 vi = vm->m_area.index(p);
-	content_t c = vm->m_data[vi].getContent();
-	if (!CONTAINS(c_place_on, c))
-		return;
-
-	Rotation rot = (rotation == ROTATE_RAND) ?
-		(Rotation)pr->range(ROTATE_0, ROTATE_270) : rotation;
-
-	blitToVManip(p, vm, rot, false);
-}
-
-
-int DecoSchematic::getHeight() {
-	return size.Y;
-}
-
-
-std::string DecoSchematic::getName() {
-	return filename;
-}
-
-
-void DecoSchematic::blitToVManip(v3s16 p, ManualMapVoxelManipulator *vm,
-								Rotation rot, bool force_placement) {
-	int xstride = 1;
-	int ystride = size.X;
-	int zstride = size.X * size.Y;
-
-	updateContentIds();
-
-	s16 sx = size.X;
-	s16 sy = size.Y;
-	s16 sz = size.Z;
-
-	int i_start, i_step_x, i_step_z;
-	switch (rot) {
-		case ROTATE_90:
-			i_start  = sx - 1;
-			i_step_x = zstride;
-			i_step_z = -xstride;
-			SWAP(s16, sx, sz);
-			break;
-		case ROTATE_180:
-			i_start  = zstride * (sz - 1) + sx - 1;
-			i_step_x = -xstride;
-			i_step_z = -zstride;
-			break;
-		case ROTATE_270:
-			i_start  = zstride * (sz - 1);
-			i_step_x = -zstride;
-			i_step_z = xstride;
-			SWAP(s16, sx, sz);
-			break;
-		default:
-			i_start  = 0;
-			i_step_x = xstride;
-			i_step_z = zstride;
-	}
-
-	s16 y_map = p.Y;
-	for (s16 y = 0; y != sy; y++) {
-		if (slice_probs[y] != MTSCHEM_PROB_ALWAYS &&
-			myrand_range(1, 255) > slice_probs[y])
-			continue;
-
-		for (s16 z = 0; z != sz; z++) {
-			u32 i = z * i_step_z + y * ystride + i_start;
-			for (s16 x = 0; x != sx; x++, i += i_step_x) {
-				u32 vi = vm->m_area.index(p.X + x, y_map, p.Z + z);
-				if (!vm->m_area.contains(vi))
-					continue;
-
-				if (schematic[i].getContent() == CONTENT_IGNORE)
-					continue;
-
-				if (schematic[i].param1 == MTSCHEM_PROB_NEVER)
-					continue;
-
-				if (!force_placement) {
-					content_t c = vm->m_data[vi].getContent();
-					if (c != CONTENT_AIR && c != CONTENT_IGNORE)
-						continue;
-				}
-
-				if (schematic[i].param1 != MTSCHEM_PROB_ALWAYS &&
-					myrand_range(1, 255) > schematic[i].param1)
-					continue;
-
-				vm->m_data[vi] = schematic[i];
-				vm->m_data[vi].param1 = 0;
-
-				if (rot)
-					vm->m_data[vi].rotateAlongYAxis(ndef, rot);
-			}
-		}
-		y_map++;
-	}
-}
-
-
-void DecoSchematic::placeStructure(Map *map, v3s16 p, bool force_placement) {
-	assert(schematic != NULL);
-	ManualMapVoxelManipulator *vm = new ManualMapVoxelManipulator(map);
-
-	Rotation rot = (rotation == ROTATE_RAND) ?
-		(Rotation)myrand_range(ROTATE_0, ROTATE_270) : rotation;
-
-	v3s16 s = (rot == ROTATE_90 || rot == ROTATE_270) ?
-				v3s16(size.Z, size.Y, size.X) : size;
-
-	if (flags & DECO_PLACE_CENTER_X)
-		p.X -= (s.X + 1) / 2;
-	if (flags & DECO_PLACE_CENTER_Y)
-		p.Y -= (s.Y + 1) / 2;
-	if (flags & DECO_PLACE_CENTER_Z)
-		p.Z -= (s.Z + 1) / 2;
-
-	v3s16 bp1 = getNodeBlockPos(p);
-	v3s16 bp2 = getNodeBlockPos(p + s - v3s16(1,1,1));
-	vm->initialEmerge(bp1, bp2);
-
-	blitToVManip(p, vm, rot, force_placement);
-
-	std::map<v3s16, MapBlock *> lighting_modified_blocks;
-	std::map<v3s16, MapBlock *> modified_blocks;
-	vm->blitBackAll(&modified_blocks);
-
-	// TODO: Optimize this by using Mapgen::calcLighting() instead
-	lighting_modified_blocks.insert(modified_blocks.begin(), modified_blocks.end());
-	map->updateLighting(lighting_modified_blocks, modified_blocks);
-
-	MapEditEvent event;
-	event.type = MEET_OTHER;
-	for (std::map<v3s16, MapBlock *>::iterator
-		it = modified_blocks.begin();
-		it != modified_blocks.end(); ++it)
-		event.modified_blocks.insert(it->first);
-
-	map->dispatchEvent(&event);
-}
-
-
-bool DecoSchematic::loadSchematicFile(NodeResolver *resolver,
-	std::map<std::string, std::string> &replace_names)
-{
-	content_t cignore = CONTENT_IGNORE;
-	bool have_cignore = false;
-
-	std::ifstream is(filename.c_str(), std::ios_base::binary);
-
-	u32 signature = readU32(is);
-	if (signature != MTSCHEM_FILE_SIGNATURE) {
-		errorstream << "loadSchematicFile: invalid schematic "
-			"file" << std::endl;
-		return false;
-	}
-
-	u16 version = readU16(is);
-	if (version > MTSCHEM_FILE_VER_HIGHEST_READ) {
-		errorstream << "loadSchematicFile: unsupported schematic "
-			"file version" << std::endl;
-		return false;
-	}
-
-	size = readV3S16(is);
-
-	delete []slice_probs;
-	slice_probs = new u8[size.Y];
-	if (version >= 3) {
-		for (int y = 0; y != size.Y; y++)
-			slice_probs[y] = readU8(is);
-	} else {
-		for (int y = 0; y != size.Y; y++)
-			slice_probs[y] = MTSCHEM_PROB_ALWAYS;
-	}
-
-	int nodecount = size.X * size.Y * size.Z;
-
-	u16 nidmapcount = readU16(is);
-
-	for (int i = 0; i != nidmapcount; i++) {
-		std::string name = deSerializeString(is);
-		if (name == "ignore") {
-			name = "air";
-			cignore = i;
-			have_cignore = true;
-		}
-
-		std::map<std::string, std::string>::iterator it;
-
-		it = replace_names.find(name);
-		if (it != replace_names.end())
-			name = it->second;
-
-		resolver->addNodeList(name.c_str(), &c_nodes);
-	}
-
-	delete []schematic;
-	schematic = new MapNode[nodecount];
-	MapNode::deSerializeBulk(is, SER_FMT_VER_HIGHEST_READ, schematic,
-				nodecount, 2, 2, true);
-
-	if (version == 1) { // fix up the probability values
-		for (int i = 0; i != nodecount; i++) {
-			if (schematic[i].param1 == 0)
-				schematic[i].param1 = MTSCHEM_PROB_ALWAYS;
-			if (have_cignore && schematic[i].getContent() == cignore)
-				schematic[i].param1 = MTSCHEM_PROB_NEVER;
-		}
-	}
-
-	return true;
-}
-
-
-/*
-	Minetest Schematic File Format
-
-	All values are stored in big-endian byte order.
-	[u32] signature: 'MTSM'
-	[u16] version: 3
-	[u16] size X
-	[u16] size Y
-	[u16] size Z
-	For each Y:
-		[u8] slice probability value
-	[Name-ID table] Name ID Mapping Table
-		[u16] name-id count
-		For each name-id mapping:
-			[u16] name length
-			[u8[]] name
-	ZLib deflated {
-	For each node in schematic:  (for z, y, x)
-		[u16] content
-	For each node in schematic:
-		[u8] probability of occurance (param1)
-	For each node in schematic:
-		[u8] param2
-	}
-
-	Version changes:
-	1 - Initial version
-	2 - Fixed messy never/always place; 0 probability is now never, 0xFF is always
-	3 - Added y-slice probabilities; this allows for variable height structures
-*/
-void DecoSchematic::saveSchematicFile(INodeDefManager *ndef) {
-	std::ostringstream ss(std::ios_base::binary);
-
-	writeU32(ss, MTSCHEM_FILE_SIGNATURE);         // signature
-	writeU16(ss, MTSCHEM_FILE_VER_HIGHEST_WRITE); // version
-	writeV3S16(ss, size);                         // schematic size
-
-	for (int y = 0; y != size.Y; y++)             // Y slice probabilities
-		writeU8(ss, slice_probs[y]);
-
-	std::vector<content_t> usednodes;
-	int nodecount = size.X * size.Y * size.Z;
-	build_nnlist_and_update_ids(schematic, nodecount, &usednodes);
-
-	u16 numids = usednodes.size();
-	writeU16(ss, numids); // name count
-	for (int i = 0; i != numids; i++)
-		ss << serializeString(ndef->get(usednodes[i]).name); // node names
-
-	// compressed bulk node data
-	MapNode::serializeBulk(ss, SER_FMT_VER_HIGHEST_WRITE, schematic,
-				nodecount, 2, 2, true);
-
-	fs::safeWriteToFile(filename, ss.str());
-}
-
-
-void build_nnlist_and_update_ids(MapNode *nodes, u32 nodecount,
-						std::vector<content_t> *usednodes) {
-	std::map<content_t, content_t> nodeidmap;
-	content_t numids = 0;
-
-	for (u32 i = 0; i != nodecount; i++) {
-		content_t id;
-		content_t c = nodes[i].getContent();
-
-		std::map<content_t, content_t>::const_iterator it = nodeidmap.find(c);
-		if (it == nodeidmap.end()) {
-			id = numids;
-			numids++;
-
-			usednodes->push_back(c);
-			nodeidmap.insert(std::make_pair(c, id));
-		} else {
-			id = it->second;
-		}
-		nodes[i].setContent(id);
-	}
-}
-
-
-bool DecoSchematic::getSchematicFromMap(Map *map, v3s16 p1, v3s16 p2) {
-	ManualMapVoxelManipulator *vm = new ManualMapVoxelManipulator(map);
-
-	v3s16 bp1 = getNodeBlockPos(p1);
-	v3s16 bp2 = getNodeBlockPos(p2);
-	vm->initialEmerge(bp1, bp2);
-
-	size = p2 - p1 + 1;
-
-	slice_probs = new u8[size.Y];
-	for (s16 y = 0; y != size.Y; y++)
-		slice_probs[y] = MTSCHEM_PROB_ALWAYS;
-
-	schematic = new MapNode[size.X * size.Y * size.Z];
-
-	u32 i = 0;
-	for (s16 z = p1.Z; z <= p2.Z; z++)
-	for (s16 y = p1.Y; y <= p2.Y; y++) {
-		u32 vi = vm->m_area.index(p1.X, y, z);
-		for (s16 x = p1.X; x <= p2.X; x++, i++, vi++) {
-			schematic[i] = vm->m_data[vi];
-			schematic[i].param1 = MTSCHEM_PROB_ALWAYS;
-		}
-	}
-
-	delete vm;
-	return true;
-}
-
-
-void DecoSchematic::applyProbabilities(v3s16 p0,
-	std::vector<std::pair<v3s16, u8> > *plist,
-	std::vector<std::pair<s16, u8> > *splist) {
-
-	for (size_t i = 0; i != plist->size(); i++) {
-		v3s16 p = (*plist)[i].first - p0;
-		int index = p.Z * (size.Y * size.X) + p.Y * size.X + p.X;
-		if (index < size.Z * size.Y * size.X) {
-			u8 prob = (*plist)[i].second;
-			schematic[index].param1 = prob;
-
-			// trim unnecessary node names from schematic
-			if (prob == MTSCHEM_PROB_NEVER)
-				schematic[index].setContent(CONTENT_AIR);
-		}
-	}
-
-	for (size_t i = 0; i != splist->size(); i++) {
-		s16 y = (*splist)[i].first - p0.Y;
-		slice_probs[y] = (*splist)[i].second;
-	}
-}
-
-
-///////////////////////////////////////////////////////////////////////////////
-
 
 Mapgen::Mapgen() {
 	seed        = 0;
diff --git a/src/mapgen.h b/src/mapgen.h
index b6efe8200..e29616342 100644
--- a/src/mapgen.h
+++ b/src/mapgen.h
@@ -37,30 +37,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #define MG_FLAT          0x08
 #define MG_LIGHT         0x10
 
-/////////////////// Ore generation flags
-// Use absolute value of height to determine ore placement
-#define OREFLAG_ABSHEIGHT 0x01
-// Use 3d noise to get density of ore placement, instead of just the position
-#define OREFLAG_DENSITY   0x02 // not yet implemented
-// For claylike ore types, place ore if the number of surrounding
-// nodes isn't the specified node
-#define OREFLAG_NODEISNT  0x04 // not yet implemented
-
-/////////////////// Decoration flags
-#define DECO_PLACE_CENTER_X     1
-#define DECO_PLACE_CENTER_Y     2
-#define DECO_PLACE_CENTER_Z     4
-#define DECO_SCHEM_CIDS_UPDATED 8
-
-#define ORE_RANGE_ACTUAL 1
-#define ORE_RANGE_MIRROR 2
-
 #define NUM_GEN_NOTIFY 6
 
 
 extern FlagDesc flagdesc_mapgen[];
-extern FlagDesc flagdesc_ore[];
-extern FlagDesc flagdesc_deco_schematic[];
 extern FlagDesc flagdesc_gennotify[];
 
 class BiomeDefManager;
@@ -92,13 +72,6 @@ enum GenNotify {
 	GENNOTIFY_LARGECAVE_END
 };
 
-enum OreType {
-	ORE_SCATTER,
-	ORE_SHEET,
-	ORE_CLAYLIKE
-};
-
-
 struct MapgenSpecificParams {
 	virtual void readParams(Settings *settings) = 0;
 	virtual void writeParams(Settings *settings) = 0;
@@ -163,163 +136,5 @@ struct MapgenFactory {
 	virtual ~MapgenFactory() {}
 };
 
-class Ore {
-public:
-	content_t c_ore;                  // the node to place
-	std::vector<content_t> c_wherein; // the nodes to be placed in
-	u32 clust_scarcity; // ore cluster has a 1-in-clust_scarcity chance of appearing at a node
-	s16 clust_num_ores; // how many ore nodes are in a chunk
-	s16 clust_size;     // how large (in nodes) a chunk of ore is
-	s16 height_min;
-	s16 height_max;
-	u8 ore_param2;		// to set node-specific attributes
-	u32 flags;          // attributes for this ore
-	float nthresh;      // threshhold for noise at which an ore is placed
-	NoiseParams *np;    // noise for distribution of clusters (NULL for uniform scattering)
-	Noise *noise;
-
-	Ore() {
-		c_ore   = CONTENT_IGNORE;
-		np      = NULL;
-		noise   = NULL;
-	}
-
-	virtual ~Ore();
-
-	void placeOre(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
-	virtual void generate(ManualMapVoxelManipulator *vm, int seed,
-						u32 blockseed, v3s16 nmin, v3s16 nmax) = 0;
-};
-
-class OreScatter : public Ore {
-	~OreScatter() {}
-	virtual void generate(ManualMapVoxelManipulator *vm, int seed,
-						u32 blockseed, v3s16 nmin, v3s16 nmax);
-};
-
-class OreSheet : public Ore {
-	~OreSheet() {}
-	virtual void generate(ManualMapVoxelManipulator *vm, int seed,
-						u32 blockseed, v3s16 nmin, v3s16 nmax);
-};
-
-Ore *createOre(OreType type);
-
-
-enum DecorationType {
-	DECO_SIMPLE,
-	DECO_SCHEMATIC,
-	DECO_LSYSTEM
-};
-
-#if 0
-struct CutoffData {
-	VoxelArea a;
-	Decoration *deco;
-	//v3s16 p;
-	//v3s16 size;
-	//s16 height;
-
-	CutoffData(s16 x, s16 y, s16 z, s16 h) {
-		p = v3s16(x, y, z);
-		height = h;
-	}
-};
-#endif
-
-class Decoration {
-public:
-	INodeDefManager *ndef;
-
-	int mapseed;
-	std::vector<content_t> c_place_on;
-	s16 sidelen;
-	float fill_ratio;
-	NoiseParams *np;
-
-	std::set<u8> biomes;
-	//std::list<CutoffData> cutoffs;
-	//JMutex cutoff_mutex;
-
-	Decoration();
-	virtual ~Decoration();
-
-	void placeDeco(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
-	void placeCutoffs(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
-
-	virtual void generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p) = 0;
-	virtual int getHeight() = 0;
-	virtual std::string getName() = 0;
-};
-
-class DecoSimple : public Decoration {
-public:
-	std::vector<content_t> c_decos;
-	std::vector<content_t> c_spawnby;
-	s16 deco_height;
-	s16 deco_height_max;
-	s16 nspawnby;
-
-	~DecoSimple() {}
-
-	bool canPlaceDecoration(ManualMapVoxelManipulator *vm, v3s16 p);
-	virtual void generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p);
-	virtual int getHeight();
-	virtual std::string getName();
-};
-
-#define MTSCHEM_FILE_SIGNATURE 0x4d54534d // 'MTSM'
-#define MTSCHEM_FILE_VER_HIGHEST_READ  3
-#define MTSCHEM_FILE_VER_HIGHEST_WRITE 3
-
-#define MTSCHEM_PROB_NEVER  0x00
-#define MTSCHEM_PROB_ALWAYS 0xFF
-
-class DecoSchematic : public Decoration {
-public:
-	std::string filename;
-
-	std::vector<content_t> c_nodes;
-
-	u32 flags;
-	Rotation rotation;
-	v3s16 size;
-	MapNode *schematic;
-	u8 *slice_probs;
-
-	DecoSchematic();
-	~DecoSchematic();
-
-	void updateContentIds();
-	virtual void generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p);
-	virtual int getHeight();
-	virtual std::string getName();
-
-	void blitToVManip(v3s16 p, ManualMapVoxelManipulator *vm,
-					Rotation rot, bool force_placement);
-
-	bool loadSchematicFile(NodeResolver *resolver,
-		std::map<std::string, std::string> &replace_names);
-	void saveSchematicFile(INodeDefManager *ndef);
-
-	bool getSchematicFromMap(Map *map, v3s16 p1, v3s16 p2);
-	void placeStructure(Map *map, v3s16 p, bool force_placement);
-	void applyProbabilities(v3s16 p0,
-		std::vector<std::pair<v3s16, u8> > *plist,
-		std::vector<std::pair<s16, u8> > *splist);
-};
-
-void build_nnlist_and_update_ids(MapNode *nodes, u32 nodecount,
-					std::vector<content_t> *usednodes);
-
-/*
-class DecoLSystem : public Decoration {
-public:
-	virtual void generate(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
-};
-*/
-
-Decoration *createDecoration(DecorationType type);
-
 #endif
 
diff --git a/src/mapgen_v6.cpp b/src/mapgen_v6.cpp
index 227b57311..c126165dc 100644
--- a/src/mapgen_v6.cpp
+++ b/src/mapgen_v6.cpp
@@ -35,6 +35,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "dungeongen.h"
 #include "cavegen.h"
 #include "treegen.h"
+#include "mg_ore.h"
+#include "mg_decoration.h"
 #include "mapgen_v6.h"
 
 FlagDesc flagdesc_mapgen_v6[] = {
diff --git a/src/mapgen_v7.cpp b/src/mapgen_v7.cpp
index 332865304..77aff6e06 100644
--- a/src/mapgen_v7.cpp
+++ b/src/mapgen_v7.cpp
@@ -34,7 +34,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "dungeongen.h"
 #include "cavegen.h"
 #include "treegen.h"
-#include "biome.h"
+#include "mg_biome.h"
+#include "mg_ore.h"
+#include "mg_decoration.h"
 #include "mapgen_v7.h"
 
 
diff --git a/src/biome.cpp b/src/mg_biome.cpp
index fc92ad603..b1172a09d 100644
--- a/src/biome.cpp
+++ b/src/mg_biome.cpp
@@ -17,7 +17,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
-#include "biome.h"
+#include "mg_biome.h"
 #include "nodedef.h"
 #include "map.h" //for ManualMapVoxelManipulator
 #include "log.h"
diff --git a/src/biome.h b/src/mg_biome.h
index 554a61f4e..3724652bd 100644
--- a/src/biome.h
+++ b/src/mg_biome.h
@@ -17,8 +17,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
-#ifndef BIOME_HEADER
-#define BIOME_HEADER
+#ifndef MG_BIOME_HEADER
+#define MG_BIOME_HEADER
 
 #include <string>
 #include "nodedef.h"
diff --git a/src/mg_decoration.cpp b/src/mg_decoration.cpp
new file mode 100644
index 000000000..7f6126bfc
--- /dev/null
+++ b/src/mg_decoration.cpp
@@ -0,0 +1,275 @@
+/*
+Minetest
+Copyright (C) 2010-2014 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+
+This program is free software; you can redistribute it and/or modify
+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 Lesser General Public License for more details.
+
+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 "mg_decoration.h"
+#include "mg_schematic.h"
+#include "mapgen.h"
+#include "map.h"
+#include "log.h"
+#include "util/numeric.h"
+
+///////////////////////////////////////////////////////////////////////////////
+
+
+Decoration *createDecoration(DecorationType type)
+{
+	switch (type) {
+	case DECO_SIMPLE:
+		return new DecoSimple;
+	case DECO_SCHEMATIC:
+		return new DecoSchematic;
+	//case DECO_LSYSTEM:
+	//	return new DecoLSystem;
+	default:
+		return NULL;
+	}
+}
+
+
+Decoration::Decoration()
+{
+	mapseed    = 0;
+	np         = NULL;
+	fill_ratio = 0;
+	sidelen    = 1;
+}
+
+
+Decoration::~Decoration()
+{
+	delete np;
+}
+
+
+void Decoration::placeDeco(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
+{
+	PseudoRandom ps(blockseed + 53);
+	int carea_size = nmax.X - nmin.X + 1;
+
+	// Divide area into parts
+	if (carea_size % sidelen) {
+		errorstream << "Decoration::placeDeco: chunk size is not divisible by "
+			"sidelen; setting sidelen to " << carea_size << std::endl;
+		sidelen = carea_size;
+	}
+
+	s16 divlen = carea_size / sidelen;
+	int area = sidelen * sidelen;
+
+	for (s16 z0 = 0; z0 < divlen; z0++)
+	for (s16 x0 = 0; x0 < divlen; x0++) {
+		v2s16 p2d_center( // Center position of part of division
+			nmin.X + sidelen / 2 + sidelen * x0,
+			nmin.Z + sidelen / 2 + sidelen * z0
+		);
+		v2s16 p2d_min( // Minimum edge of part of division
+			nmin.X + sidelen * x0,
+			nmin.Z + sidelen * z0
+		);
+		v2s16 p2d_max( // Maximum edge of part of division
+			nmin.X + sidelen + sidelen * x0 - 1,
+			nmin.Z + sidelen + sidelen * z0 - 1
+		);
+
+		// Amount of decorations
+		float nval = np ?
+			NoisePerlin2D(np, p2d_center.X, p2d_center.Y, mapseed) :
+			fill_ratio;
+		u32 deco_count = area * MYMAX(nval, 0.f);
+
+		for (u32 i = 0; i < deco_count; i++) {
+			s16 x = ps.range(p2d_min.X, p2d_max.X);
+			s16 z = ps.range(p2d_min.Y, p2d_max.Y);
+
+			int mapindex = carea_size * (z - nmin.Z) + (x - nmin.X);
+
+			s16 y = mg->heightmap ?
+					mg->heightmap[mapindex] :
+					mg->findGroundLevel(v2s16(x, z), nmin.Y, nmax.Y);
+
+			if (y < nmin.Y || y > nmax.Y)
+				continue;
+
+			int height = getHeight();
+			int max_y = nmax.Y;// + MAP_BLOCKSIZE - 1;
+			if (y + 1 + height > max_y) {
+				continue;
+#if 0
+				printf("Decoration at (%d %d %d) cut off\n", x, y, z);
+				//add to queue
+				JMutexAutoLock cutofflock(cutoff_mutex);
+				cutoffs.push_back(CutoffData(x, y, z, height));
+#endif
+			}
+
+			if (mg->biomemap) {
+				std::set<u8>::iterator iter;
+
+				if (biomes.size()) {
+					iter = biomes.find(mg->biomemap[mapindex]);
+					if (iter == biomes.end())
+						continue;
+				}
+			}
+
+			generate(mg, &ps, max_y, v3s16(x, y, z));
+		}
+	}
+}
+
+
+#if 0
+void Decoration::placeCutoffs(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
+{
+	PseudoRandom pr(blockseed + 53);
+	std::vector<CutoffData> handled_cutoffs;
+
+	// Copy over the cutoffs we're interested in so we don't needlessly hold a lock
+	{
+		JMutexAutoLock cutofflock(cutoff_mutex);
+		for (std::list<CutoffData>::iterator i = cutoffs.begin();
+			i != cutoffs.end(); ++i) {
+			CutoffData cutoff = *i;
+			v3s16 p    = cutoff.p;
+			s16 height = cutoff.height;
+			if (p.X < nmin.X || p.X > nmax.X ||
+				p.Z < nmin.Z || p.Z > nmax.Z)
+				continue;
+			if (p.Y + height < nmin.Y || p.Y > nmax.Y)
+				continue;
+
+			handled_cutoffs.push_back(cutoff);
+		}
+	}
+
+	// Generate the cutoffs
+	for (size_t i = 0; i != handled_cutoffs.size(); i++) {
+		v3s16 p    = handled_cutoffs[i].p;
+		s16 height = handled_cutoffs[i].height;
+
+		if (p.Y + height > nmax.Y) {
+			//printf("Decoration at (%d %d %d) cut off again!\n", p.X, p.Y, p.Z);
+			cuttoffs.push_back(v3s16(p.X, p.Y, p.Z));
+		}
+
+		generate(mg, &pr, nmax.Y, nmin.Y - p.Y, v3s16(p.X, nmin.Y, p.Z));
+	}
+
+	// Remove cutoffs that were handled from the cutoff list
+	{
+		JMutexAutoLock cutofflock(cutoff_mutex);
+		for (std::list<CutoffData>::iterator i = cutoffs.begin();
+			i != cutoffs.end(); ++i) {
+
+			for (size_t j = 0; j != handled_cutoffs.size(); j++) {
+				CutoffData coff = *i;
+				if (coff.p == handled_cutoffs[j].p)
+					i = cutoffs.erase(i);
+			}
+		}
+	}
+}
+#endif
+
+
+///////////////////////////////////////////////////////////////////////////////
+
+bool DecoSimple::canPlaceDecoration(ManualMapVoxelManipulator *vm, v3s16 p)
+{
+	// Don't bother if there aren't any decorations to place
+	if (c_decos.size() == 0)
+		return false;
+
+	u32 vi = vm->m_area.index(p);
+
+	// Check if the decoration can be placed on this node
+	if (!CONTAINS(c_place_on, vm->m_data[vi].getContent()))
+		return false;
+
+	// Don't continue if there are no spawnby constraints
+	if (nspawnby == -1)
+		return true;
+
+	int nneighs = 0;
+	v3s16 dirs[8] = {
+		v3s16( 0, 0,  1),
+		v3s16( 0, 0, -1),
+		v3s16( 1, 0,  0),
+		v3s16(-1, 0,  0),
+		v3s16( 1, 0,  1),
+		v3s16(-1, 0,  1),
+		v3s16(-1, 0, -1),
+		v3s16( 1, 0, -1)
+	};
+
+	// Check a Moore neighborhood if there are enough spawnby nodes
+	for (size_t i = 0; i != ARRLEN(dirs); i++) {
+		u32 index = vm->m_area.index(p + dirs[i]);
+		if (!vm->m_area.contains(index))
+			continue;
+
+		if (CONTAINS(c_spawnby, vm->m_data[index].getContent()))
+			nneighs++;
+	}
+
+	if (nneighs < nspawnby)
+		return false;
+
+	return true;
+}
+
+
+void DecoSimple::generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p)
+{
+	ManualMapVoxelManipulator *vm = mg->vm;
+
+	if (!canPlaceDecoration(vm, p))
+		return;
+
+	content_t c_place = c_decos[pr->range(0, c_decos.size() - 1)];
+
+	s16 height = (deco_height_max > 0) ?
+		pr->range(deco_height, deco_height_max) : deco_height;
+
+	height = MYMIN(height, max_y - p.Y);
+
+	v3s16 em = vm->m_area.getExtent();
+	u32 vi = vm->m_area.index(p);
+	for (int i = 0; i < height; i++) {
+		vm->m_area.add_y(em, vi, 1);
+
+		content_t c = vm->m_data[vi].getContent();
+		if (c != CONTENT_AIR && c != CONTENT_IGNORE)
+			break;
+
+		vm->m_data[vi] = MapNode(c_place);
+	}
+}
+
+
+int DecoSimple::getHeight()
+{
+	return (deco_height_max > 0) ? deco_height_max : deco_height;
+}
+
+
+std::string DecoSimple::getName()
+{
+	return "";
+}
diff --git a/src/mg_decoration.h b/src/mg_decoration.h
new file mode 100644
index 000000000..78ff9dc2e
--- /dev/null
+++ b/src/mg_decoration.h
@@ -0,0 +1,102 @@
+/*
+Minetest
+Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+
+This program is free software; you can redistribute it and/or modify
+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 Lesser General Public License for more details.
+
+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.
+*/
+
+#ifndef MG_DECORATION_HEADER
+#define MG_DECORATION_HEADER
+
+#include <set>
+#include "mapnode.h"
+
+class NoiseParams;
+class Mapgen;
+class ManualMapVoxelManipulator;
+class PseudoRandom;
+
+enum DecorationType {
+	DECO_SIMPLE,
+	DECO_SCHEMATIC,
+	DECO_LSYSTEM
+};
+
+#if 0
+struct CutoffData {
+	VoxelArea a;
+	Decoration *deco;
+	//v3s16 p;
+	//v3s16 size;
+	//s16 height;
+
+	CutoffData(s16 x, s16 y, s16 z, s16 h) {
+		p = v3s16(x, y, z);
+		height = h;
+	}
+};
+#endif
+
+class Decoration {
+public:
+	INodeDefManager *ndef;
+
+	int mapseed;
+	std::vector<content_t> c_place_on;
+	s16 sidelen;
+	float fill_ratio;
+	NoiseParams *np;
+
+	std::set<u8> biomes;
+	//std::list<CutoffData> cutoffs;
+	//JMutex cutoff_mutex;
+
+	Decoration();
+	virtual ~Decoration();
+
+	void placeDeco(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
+	void placeCutoffs(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
+
+	virtual void generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p) = 0;
+	virtual int getHeight() = 0;
+	virtual std::string getName() = 0;
+};
+
+class DecoSimple : public Decoration {
+public:
+	std::vector<content_t> c_decos;
+	std::vector<content_t> c_spawnby;
+	s16 deco_height;
+	s16 deco_height_max;
+	s16 nspawnby;
+
+	~DecoSimple() {}
+
+	bool canPlaceDecoration(ManualMapVoxelManipulator *vm, v3s16 p);
+	virtual void generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p);
+	virtual int getHeight();
+	virtual std::string getName();
+};
+
+/*
+class DecoLSystem : public Decoration {
+public:
+	virtual void generate(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
+};
+*/
+
+Decoration *createDecoration(DecorationType type);
+
+#endif
diff --git a/src/mg_ore.cpp b/src/mg_ore.cpp
new file mode 100644
index 000000000..c8d224dc6
--- /dev/null
+++ b/src/mg_ore.cpp
@@ -0,0 +1,161 @@
+/*
+Minetest
+Copyright (C) 2010-2014 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+
+This program is free software; you can redistribute it and/or modify
+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 Lesser General Public License for more details.
+
+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 "mg_ore.h"
+#include "mapgen.h"
+#include "util/numeric.h"
+#include "map.h"
+#include "log.h"
+
+
+FlagDesc flagdesc_ore[] = {
+	{"absheight",            OREFLAG_ABSHEIGHT},
+	{"scatter_noisedensity", OREFLAG_DENSITY},
+	{"claylike_nodeisnt",    OREFLAG_NODEISNT},
+	{NULL,                   0}
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+
+Ore *createOre(OreType type)
+{
+	switch (type) {
+	case ORE_SCATTER:
+		return new OreScatter;
+	case ORE_SHEET:
+		return new OreSheet;
+	//case ORE_CLAYLIKE: //TODO: implement this!
+	//	return new OreClaylike;
+	default:
+		return NULL;
+	}
+}
+
+
+Ore::~Ore()
+{
+	delete np;
+	delete noise;
+}
+
+
+void Ore::placeOre(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
+{
+	int in_range = 0;
+
+	in_range |= (nmin.Y <= height_max && nmax.Y >= height_min);
+	if (flags & OREFLAG_ABSHEIGHT)
+		in_range |= (nmin.Y >= -height_max && nmax.Y <= -height_min) << 1;
+	if (!in_range)
+		return;
+
+	int ymin, ymax;
+	if (in_range & ORE_RANGE_MIRROR) {
+		ymin = MYMAX(nmin.Y, -height_max);
+		ymax = MYMIN(nmax.Y, -height_min);
+	} else {
+		ymin = MYMAX(nmin.Y, height_min);
+		ymax = MYMIN(nmax.Y, height_max);
+	}
+	if (clust_size >= ymax - ymin + 1)
+		return;
+
+	nmin.Y = ymin;
+	nmax.Y = ymax;
+	generate(mg->vm, mg->seed, blockseed, nmin, nmax);
+}
+
+
+void OreScatter::generate(ManualMapVoxelManipulator *vm, int seed,
+	u32 blockseed, v3s16 nmin, v3s16 nmax)
+{
+	PseudoRandom pr(blockseed);
+	MapNode n_ore(c_ore, 0, ore_param2);
+
+	int volume = (nmax.X - nmin.X + 1) *
+				 (nmax.Y - nmin.Y + 1) *
+				 (nmax.Z - nmin.Z + 1);
+	int csize     = clust_size;
+	int orechance = (csize * csize * csize) / clust_num_ores;
+	int nclusters = volume / clust_scarcity;
+
+	for (int i = 0; i != nclusters; i++) {
+		int x0 = pr.range(nmin.X, nmax.X - csize + 1);
+		int y0 = pr.range(nmin.Y, nmax.Y - csize + 1);
+		int z0 = pr.range(nmin.Z, nmax.Z - csize + 1);
+
+		if (np && (NoisePerlin3D(np, x0, y0, z0, seed) < nthresh))
+			continue;
+
+		for (int z1 = 0; z1 != csize; z1++)
+		for (int y1 = 0; y1 != csize; y1++)
+		for (int x1 = 0; x1 != csize; x1++) {
+			if (pr.range(1, orechance) != 1)
+				continue;
+
+			u32 i = vm->m_area.index(x0 + x1, y0 + y1, z0 + z1);
+			if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
+				continue;
+
+			vm->m_data[i] = n_ore;
+		}
+	}
+}
+
+
+void OreSheet::generate(ManualMapVoxelManipulator *vm, int seed,
+	u32 blockseed, v3s16 nmin, v3s16 nmax)
+{
+	PseudoRandom pr(blockseed + 4234);
+	MapNode n_ore(c_ore, 0, ore_param2);
+
+	int max_height = clust_size;
+	int y_start = pr.range(nmin.Y, nmax.Y - max_height);
+
+	if (!noise) {
+		int sx = nmax.X - nmin.X + 1;
+		int sz = nmax.Z - nmin.Z + 1;
+		noise = new Noise(np, 0, sx, sz);
+	}
+	noise->seed = seed + y_start;
+	noise->perlinMap2D(nmin.X, nmin.Z);
+
+	int index = 0;
+	for (int z = nmin.Z; z <= nmax.Z; z++)
+	for (int x = nmin.X; x <= nmax.X; x++) {
+		float noiseval = noise->result[index++];
+		if (noiseval < nthresh)
+			continue;
+
+		int height = max_height * (1. / pr.range(1, 3));
+		int y0 = y_start + np->scale * noiseval; //pr.range(1, 3) - 1;
+		int y1 = y0 + height;
+		for (int y = y0; y != y1; y++) {
+			u32 i = vm->m_area.index(x, y, z);
+			if (!vm->m_area.contains(i))
+				continue;
+			if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
+				continue;
+
+			vm->m_data[i] = n_ore;
+		}
+	}
+}
+
diff --git a/src/mg_ore.h b/src/mg_ore.h
new file mode 100644
index 000000000..c279703a8
--- /dev/null
+++ b/src/mg_ore.h
@@ -0,0 +1,94 @@
+/*
+Minetest
+Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+
+This program is free software; you can redistribute it and/or modify
+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 Lesser General Public License for more details.
+
+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.
+*/
+
+#ifndef MG_ORE_HEADER
+#define MG_ORE_HEADER
+
+#include "util/string.h"
+#include "mapnode.h"
+
+class NoiseParams;
+class Noise;
+class Mapgen;
+class ManualMapVoxelManipulator;
+
+/////////////////// Ore generation flags
+// Use absolute value of height to determine ore placement
+#define OREFLAG_ABSHEIGHT 0x01
+// Use 3d noise to get density of ore placement, instead of just the position
+#define OREFLAG_DENSITY   0x02 // not yet implemented
+// For claylike ore types, place ore if the number of surrounding
+// nodes isn't the specified node
+#define OREFLAG_NODEISNT  0x04 // not yet implemented
+
+#define ORE_RANGE_ACTUAL 1
+#define ORE_RANGE_MIRROR 2
+
+extern FlagDesc flagdesc_ore[];
+
+enum OreType {
+	ORE_SCATTER,
+	ORE_SHEET,
+	ORE_CLAYLIKE
+};
+
+class Ore {
+public:
+	content_t c_ore;                  // the node to place
+	std::vector<content_t> c_wherein; // the nodes to be placed in
+	u32 clust_scarcity; // ore cluster has a 1-in-clust_scarcity chance of appearing at a node
+	s16 clust_num_ores; // how many ore nodes are in a chunk
+	s16 clust_size;     // how large (in nodes) a chunk of ore is
+	s16 height_min;
+	s16 height_max;
+	u8 ore_param2;		// to set node-specific attributes
+	u32 flags;          // attributes for this ore
+	float nthresh;      // threshhold for noise at which an ore is placed
+	NoiseParams *np;    // noise for distribution of clusters (NULL for uniform scattering)
+	Noise *noise;
+
+	Ore() {
+		c_ore   = CONTENT_IGNORE;
+		np      = NULL;
+		noise   = NULL;
+	}
+
+	virtual ~Ore();
+
+	void placeOre(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax);
+	virtual void generate(ManualMapVoxelManipulator *vm, int seed,
+						u32 blockseed, v3s16 nmin, v3s16 nmax) = 0;
+};
+
+class OreScatter : public Ore {
+	~OreScatter() {}
+	virtual void generate(ManualMapVoxelManipulator *vm, int seed,
+						u32 blockseed, v3s16 nmin, v3s16 nmax);
+};
+
+class OreSheet : public Ore {
+	~OreSheet() {}
+	virtual void generate(ManualMapVoxelManipulator *vm, int seed,
+						u32 blockseed, v3s16 nmin, v3s16 nmax);
+};
+
+Ore *createOre(OreType type);
+
+
+#endif
diff --git a/src/mg_schematic.cpp b/src/mg_schematic.cpp
new file mode 100644
index 000000000..8b34fb4fd
--- /dev/null
+++ b/src/mg_schematic.cpp
@@ -0,0 +1,432 @@
+/*
+Minetest
+Copyright (C) 2010-2014 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+
+This program is free software; you can redistribute it and/or modify
+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 Lesser General Public License for more details.
+
+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 <fstream>
+#include "mg_schematic.h"
+#include "mapgen.h"
+#include "map.h"
+#include "mapblock.h"
+#include "log.h"
+#include "util/numeric.h"
+#include "util/serialize.h"
+#include "serialization.h"
+#include "filesys.h"
+
+FlagDesc flagdesc_deco_schematic[] = {
+	{"place_center_x", DECO_PLACE_CENTER_X},
+	{"place_center_y", DECO_PLACE_CENTER_Y},
+	{"place_center_z", DECO_PLACE_CENTER_Z},
+	{NULL,             0}
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+
+DecoSchematic::DecoSchematic()
+{
+	schematic   = NULL;
+	slice_probs = NULL;
+	flags       = 0;
+	size        = v3s16(0, 0, 0);
+}
+
+
+DecoSchematic::~DecoSchematic()
+{
+	delete []schematic;
+	delete []slice_probs;
+}
+
+
+void DecoSchematic::updateContentIds()
+{
+	if (flags & DECO_SCHEM_CIDS_UPDATED)
+		return;
+
+	flags |= DECO_SCHEM_CIDS_UPDATED;
+
+	for (int i = 0; i != size.X * size.Y * size.Z; i++)
+		schematic[i].setContent(c_nodes[schematic[i].getContent()]);
+}
+
+
+void DecoSchematic::generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p)
+{
+	ManualMapVoxelManipulator *vm = mg->vm;
+
+	if (flags & DECO_PLACE_CENTER_X)
+		p.X -= (size.X + 1) / 2;
+	if (flags & DECO_PLACE_CENTER_Y)
+		p.Y -= (size.Y + 1) / 2;
+	if (flags & DECO_PLACE_CENTER_Z)
+		p.Z -= (size.Z + 1) / 2;
+
+	u32 vi = vm->m_area.index(p);
+	content_t c = vm->m_data[vi].getContent();
+	if (!CONTAINS(c_place_on, c))
+		return;
+
+	Rotation rot = (rotation == ROTATE_RAND) ?
+		(Rotation)pr->range(ROTATE_0, ROTATE_270) : rotation;
+
+	blitToVManip(p, vm, rot, false);
+}
+
+
+int DecoSchematic::getHeight() {
+	return size.Y;
+}
+
+
+std::string DecoSchematic::getName() {
+	return filename;
+}
+
+
+void DecoSchematic::blitToVManip(v3s16 p, ManualMapVoxelManipulator *vm,
+	Rotation rot, bool force_placement)
+{
+	int xstride = 1;
+	int ystride = size.X;
+	int zstride = size.X * size.Y;
+
+	updateContentIds();
+
+	s16 sx = size.X;
+	s16 sy = size.Y;
+	s16 sz = size.Z;
+
+	int i_start, i_step_x, i_step_z;
+	switch (rot) {
+		case ROTATE_90:
+			i_start  = sx - 1;
+			i_step_x = zstride;
+			i_step_z = -xstride;
+			SWAP(s16, sx, sz);
+			break;
+		case ROTATE_180:
+			i_start  = zstride * (sz - 1) + sx - 1;
+			i_step_x = -xstride;
+			i_step_z = -zstride;
+			break;
+		case ROTATE_270:
+			i_start  = zstride * (sz - 1);
+			i_step_x = -zstride;
+			i_step_z = xstride;
+			SWAP(s16, sx, sz);
+			break;
+		default:
+			i_start  = 0;
+			i_step_x = xstride;
+			i_step_z = zstride;
+	}
+
+	s16 y_map = p.Y;
+	for (s16 y = 0; y != sy; y++) {
+		if (slice_probs[y] != MTSCHEM_PROB_ALWAYS &&
+			myrand_range(1, 255) > slice_probs[y])
+			continue;
+
+		for (s16 z = 0; z != sz; z++) {
+			u32 i = z * i_step_z + y * ystride + i_start;
+			for (s16 x = 0; x != sx; x++, i += i_step_x) {
+				u32 vi = vm->m_area.index(p.X + x, y_map, p.Z + z);
+				if (!vm->m_area.contains(vi))
+					continue;
+
+				if (schematic[i].getContent() == CONTENT_IGNORE)
+					continue;
+
+				if (schematic[i].param1 == MTSCHEM_PROB_NEVER)
+					continue;
+
+				if (!force_placement) {
+					content_t c = vm->m_data[vi].getContent();
+					if (c != CONTENT_AIR && c != CONTENT_IGNORE)
+						continue;
+				}
+
+				if (schematic[i].param1 != MTSCHEM_PROB_ALWAYS &&
+					myrand_range(1, 255) > schematic[i].param1)
+					continue;
+
+				vm->m_data[vi] = schematic[i];
+				vm->m_data[vi].param1 = 0;
+
+				if (rot)
+					vm->m_data[vi].rotateAlongYAxis(ndef, rot);
+			}
+		}
+		y_map++;
+	}
+}
+
+
+void DecoSchematic::placeStructure(Map *map, v3s16 p, bool force_placement)
+{
+	assert(schematic != NULL);
+	ManualMapVoxelManipulator *vm = new ManualMapVoxelManipulator(map);
+
+	Rotation rot = (rotation == ROTATE_RAND) ?
+		(Rotation)myrand_range(ROTATE_0, ROTATE_270) : rotation;
+
+	v3s16 s = (rot == ROTATE_90 || rot == ROTATE_270) ?
+				v3s16(size.Z, size.Y, size.X) : size;
+
+	if (flags & DECO_PLACE_CENTER_X)
+		p.X -= (s.X + 1) / 2;
+	if (flags & DECO_PLACE_CENTER_Y)
+		p.Y -= (s.Y + 1) / 2;
+	if (flags & DECO_PLACE_CENTER_Z)
+		p.Z -= (s.Z + 1) / 2;
+
+	v3s16 bp1 = getNodeBlockPos(p);
+	v3s16 bp2 = getNodeBlockPos(p + s - v3s16(1,1,1));
+	vm->initialEmerge(bp1, bp2);
+
+	blitToVManip(p, vm, rot, force_placement);
+
+	std::map<v3s16, MapBlock *> lighting_modified_blocks;
+	std::map<v3s16, MapBlock *> modified_blocks;
+	vm->blitBackAll(&modified_blocks);
+
+	// TODO: Optimize this by using Mapgen::calcLighting() instead
+	lighting_modified_blocks.insert(modified_blocks.begin(), modified_blocks.end());
+	map->updateLighting(lighting_modified_blocks, modified_blocks);
+
+	MapEditEvent event;
+	event.type = MEET_OTHER;
+	for (std::map<v3s16, MapBlock *>::iterator
+		it = modified_blocks.begin();
+		it != modified_blocks.end(); ++it)
+		event.modified_blocks.insert(it->first);
+
+	map->dispatchEvent(&event);
+}
+
+
+bool DecoSchematic::loadSchematicFile(NodeResolver *resolver,
+	std::map<std::string, std::string> &replace_names)
+{
+	content_t cignore = CONTENT_IGNORE;
+	bool have_cignore = false;
+
+	std::ifstream is(filename.c_str(), std::ios_base::binary);
+
+	u32 signature = readU32(is);
+	if (signature != MTSCHEM_FILE_SIGNATURE) {
+		errorstream << "loadSchematicFile: invalid schematic "
+			"file" << std::endl;
+		return false;
+	}
+
+	u16 version = readU16(is);
+	if (version > MTSCHEM_FILE_VER_HIGHEST_READ) {
+		errorstream << "loadSchematicFile: unsupported schematic "
+			"file version" << std::endl;
+		return false;
+	}
+
+	size = readV3S16(is);
+
+	delete []slice_probs;
+	slice_probs = new u8[size.Y];
+	if (version >= 3) {
+		for (int y = 0; y != size.Y; y++)
+			slice_probs[y] = readU8(is);
+	} else {
+		for (int y = 0; y != size.Y; y++)
+			slice_probs[y] = MTSCHEM_PROB_ALWAYS;
+	}
+
+	int nodecount = size.X * size.Y * size.Z;
+
+	u16 nidmapcount = readU16(is);
+
+	for (int i = 0; i != nidmapcount; i++) {
+		std::string name = deSerializeString(is);
+		if (name == "ignore") {
+			name = "air";
+			cignore = i;
+			have_cignore = true;
+		}
+
+		std::map<std::string, std::string>::iterator it;
+
+		it = replace_names.find(name);
+		if (it != replace_names.end())
+			name = it->second;
+
+		resolver->addNodeList(name.c_str(), &c_nodes);
+	}
+
+	delete []schematic;
+	schematic = new MapNode[nodecount];
+	MapNode::deSerializeBulk(is, SER_FMT_VER_HIGHEST_READ, schematic,
+				nodecount, 2, 2, true);
+
+	if (version == 1) { // fix up the probability values
+		for (int i = 0; i != nodecount; i++) {
+			if (schematic[i].param1 == 0)
+				schematic[i].param1 = MTSCHEM_PROB_ALWAYS;
+			if (have_cignore && schematic[i].getContent() == cignore)
+				schematic[i].param1 = MTSCHEM_PROB_NEVER;
+		}
+	}
+
+	return true;
+}
+
+
+/*
+	Minetest Schematic File Format
+
+	All values are stored in big-endian byte order.
+	[u32] signature: 'MTSM'
+	[u16] version: 3
+	[u16] size X
+	[u16] size Y
+	[u16] size Z
+	For each Y:
+		[u8] slice probability value
+	[Name-ID table] Name ID Mapping Table
+		[u16] name-id count
+		For each name-id mapping:
+			[u16] name length
+			[u8[]] name
+	ZLib deflated {
+	For each node in schematic:  (for z, y, x)
+		[u16] content
+	For each node in schematic:
+		[u8] probability of occurance (param1)
+	For each node in schematic:
+		[u8] param2
+	}
+
+	Version changes:
+	1 - Initial version
+	2 - Fixed messy never/always place; 0 probability is now never, 0xFF is always
+	3 - Added y-slice probabilities; this allows for variable height structures
+*/
+void DecoSchematic::saveSchematicFile(INodeDefManager *ndef)
+{
+	std::ostringstream ss(std::ios_base::binary);
+
+	writeU32(ss, MTSCHEM_FILE_SIGNATURE);         // signature
+	writeU16(ss, MTSCHEM_FILE_VER_HIGHEST_WRITE); // version
+	writeV3S16(ss, size);                         // schematic size
+
+	for (int y = 0; y != size.Y; y++)             // Y slice probabilities
+		writeU8(ss, slice_probs[y]);
+
+	std::vector<content_t> usednodes;
+	int nodecount = size.X * size.Y * size.Z;
+	build_nnlist_and_update_ids(schematic, nodecount, &usednodes);
+
+	u16 numids = usednodes.size();
+	writeU16(ss, numids); // name count
+	for (int i = 0; i != numids; i++)
+		ss << serializeString(ndef->get(usednodes[i]).name); // node names
+
+	// compressed bulk node data
+	MapNode::serializeBulk(ss, SER_FMT_VER_HIGHEST_WRITE, schematic,
+				nodecount, 2, 2, true);
+
+	fs::safeWriteToFile(filename, ss.str());
+}
+
+
+void build_nnlist_and_update_ids(MapNode *nodes, u32 nodecount,
+	std::vector<content_t> *usednodes)
+{
+	std::map<content_t, content_t> nodeidmap;
+	content_t numids = 0;
+
+	for (u32 i = 0; i != nodecount; i++) {
+		content_t id;
+		content_t c = nodes[i].getContent();
+
+		std::map<content_t, content_t>::const_iterator it = nodeidmap.find(c);
+		if (it == nodeidmap.end()) {
+			id = numids;
+			numids++;
+
+			usednodes->push_back(c);
+			nodeidmap.insert(std::make_pair(c, id));
+		} else {
+			id = it->second;
+		}
+		nodes[i].setContent(id);
+	}
+}
+
+
+bool DecoSchematic::getSchematicFromMap(Map *map, v3s16 p1, v3s16 p2)
+{
+	ManualMapVoxelManipulator *vm = new ManualMapVoxelManipulator(map);
+
+	v3s16 bp1 = getNodeBlockPos(p1);
+	v3s16 bp2 = getNodeBlockPos(p2);
+	vm->initialEmerge(bp1, bp2);
+
+	size = p2 - p1 + 1;
+
+	slice_probs = new u8[size.Y];
+	for (s16 y = 0; y != size.Y; y++)
+		slice_probs[y] = MTSCHEM_PROB_ALWAYS;
+
+	schematic = new MapNode[size.X * size.Y * size.Z];
+
+	u32 i = 0;
+	for (s16 z = p1.Z; z <= p2.Z; z++)
+	for (s16 y = p1.Y; y <= p2.Y; y++) {
+		u32 vi = vm->m_area.index(p1.X, y, z);
+		for (s16 x = p1.X; x <= p2.X; x++, i++, vi++) {
+			schematic[i] = vm->m_data[vi];
+			schematic[i].param1 = MTSCHEM_PROB_ALWAYS;
+		}
+	}
+
+	delete vm;
+	return true;
+}
+
+
+void DecoSchematic::applyProbabilities(v3s16 p0,
+	std::vector<std::pair<v3s16, u8> > *plist,
+	std::vector<std::pair<s16, u8> > *splist)
+{
+	for (size_t i = 0; i != plist->size(); i++) {
+		v3s16 p = (*plist)[i].first - p0;
+		int index = p.Z * (size.Y * size.X) + p.Y * size.X + p.X;
+		if (index < size.Z * size.Y * size.X) {
+			u8 prob = (*plist)[i].second;
+			schematic[index].param1 = prob;
+
+			// trim unnecessary node names from schematic
+			if (prob == MTSCHEM_PROB_NEVER)
+				schematic[index].setContent(CONTENT_AIR);
+		}
+	}
+
+	for (size_t i = 0; i != splist->size(); i++) {
+		s16 y = (*splist)[i].first - p0.Y;
+		slice_probs[y] = (*splist)[i].second;
+	}
+}
diff --git a/src/mg_schematic.h b/src/mg_schematic.h
new file mode 100644
index 000000000..8a495fef2
--- /dev/null
+++ b/src/mg_schematic.h
@@ -0,0 +1,87 @@
+/*
+Minetest
+Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+
+This program is free software; you can redistribute it and/or modify
+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 Lesser General Public License for more details.
+
+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.
+*/
+
+#ifndef MG_SCHEMATIC_HEADER
+#define MG_SCHEMATIC_HEADER
+
+#include <map>
+#include "mg_decoration.h"
+#include "util/string.h"
+
+class Map;
+class Mapgen;
+class ManualMapVoxelManipulator;
+class PseudoRandom;
+class NodeResolver;
+
+/////////////////// Decoration flags
+#define DECO_PLACE_CENTER_X     1
+#define DECO_PLACE_CENTER_Y     2
+#define DECO_PLACE_CENTER_Z     4
+#define DECO_SCHEM_CIDS_UPDATED 8
+
+
+#define MTSCHEM_FILE_SIGNATURE 0x4d54534d // 'MTSM'
+#define MTSCHEM_FILE_VER_HIGHEST_READ  3
+#define MTSCHEM_FILE_VER_HIGHEST_WRITE 3
+
+#define MTSCHEM_PROB_NEVER  0x00
+#define MTSCHEM_PROB_ALWAYS 0xFF
+
+extern FlagDesc flagdesc_deco_schematic[];
+
+class DecoSchematic : public Decoration {
+public:
+	std::string filename;
+
+	std::vector<content_t> c_nodes;
+
+	u32 flags;
+	Rotation rotation;
+	v3s16 size;
+	MapNode *schematic;
+	u8 *slice_probs;
+
+	DecoSchematic();
+	~DecoSchematic();
+
+	void updateContentIds();
+	virtual void generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p);
+	virtual int getHeight();
+	virtual std::string getName();
+
+	void blitToVManip(v3s16 p, ManualMapVoxelManipulator *vm,
+					Rotation rot, bool force_placement);
+
+	bool loadSchematicFile(NodeResolver *resolver,
+		std::map<std::string, std::string> &replace_names);
+	void saveSchematicFile(INodeDefManager *ndef);
+
+	bool getSchematicFromMap(Map *map, v3s16 p1, v3s16 p2);
+	void placeStructure(Map *map, v3s16 p, bool force_placement);
+	void applyProbabilities(v3s16 p0,
+		std::vector<std::pair<v3s16, u8> > *plist,
+		std::vector<std::pair<s16, u8> > *splist);
+};
+
+void build_nnlist_and_update_ids(MapNode *nodes, u32 nodecount,
+					std::vector<content_t> *usednodes);
+
+
+#endif
diff --git a/src/script/common/c_content.cpp b/src/script/common/c_content.cpp
index 58d8c473e..88bbedec5 100644
--- a/src/script/common/c_content.cpp
+++ b/src/script/common/c_content.cpp
@@ -31,7 +31,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "tool.h"
 #include "serverobject.h"
 #include "porting.h"
-#include "mapgen.h"
+#include "mg_schematic.h"
+#include "noise.h"
 #include "json/json.h"
 
 struct EnumString es_TileAnimationType[] =
diff --git a/src/script/lua_api/l_mapgen.cpp b/src/script/lua_api/l_mapgen.cpp
index fdbeafb31..2ed9fadf9 100644
--- a/src/script/lua_api/l_mapgen.cpp
+++ b/src/script/lua_api/l_mapgen.cpp
@@ -25,8 +25,12 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/serialize.h"
 #include "server.h"
 #include "environment.h"
-#include "biome.h"
+#include "mg_biome.h"
 #include "emerge.h"
+#include "mg_biome.h"
+#include "mg_ore.h"
+#include "mg_decoration.h"
+#include "mg_schematic.h"
 #include "mapgen_v7.h"
 #include "main.h"
 #include "log.h"
diff --git a/src/server.cpp b/src/server.cpp
index 812ab6410..2558d0d6f 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -44,7 +44,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "craftdef.h"
 #include "emerge.h"
 #include "mapgen.h"
-#include "biome.h"
+#include "mg_biome.h"
 #include "content_mapnode.h"
 #include "content_nodemeta.h"
 #include "content_abm.h"