Move files to subdirectories (#6599)

* Move files around

1 files changed, 1140 insertions, 0 deletions

diff --git a/src/mapgen/mapgen.cpp b/src/mapgen/mapgen.cpp
new file mode 100644
index 000000000..f73e16dd0
--- /dev/null
+++ b/src/mapgen/mapgen.cpp
@@ -0,0 +1,1140 @@
+/*
+Minetest
+Copyright (C) 2010-2015 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2013-2016 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+Copyright (C) 2015-2017 paramat
+
+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 "mapgen.h"
+#include "voxel.h"
+#include "noise.h"
+#include "gamedef.h"
+#include "mg_biome.h"
+#include "mapblock.h"
+#include "mapnode.h"
+#include "map.h"
+#include "content_sao.h"
+#include "nodedef.h"
+#include "emerge.h"
+#include "voxelalgorithms.h"
+#include "porting.h"
+#include "profiler.h"
+#include "settings.h"
+#include "treegen.h"
+#include "serialization.h"
+#include "util/serialize.h"
+#include "util/numeric.h"
+#include "filesys.h"
+#include "log.h"
+#include "mapgen_carpathian.h"
+#include "mapgen_flat.h"
+#include "mapgen_fractal.h"
+#include "mapgen_v5.h"
+#include "mapgen_v6.h"
+#include "mapgen_v7.h"
+#include "mapgen_valleys.h"
+#include "mapgen_singlenode.h"
+#include "cavegen.h"
+#include "dungeongen.h"
+
+FlagDesc flagdesc_mapgen[] = {
+	{"caves",       MG_CAVES},
+	{"dungeons",    MG_DUNGEONS},
+	{"light",       MG_LIGHT},
+	{"decorations", MG_DECORATIONS},
+	{NULL,       0}
+};
+
+FlagDesc flagdesc_gennotify[] = {
+	{"dungeon",          1 << GENNOTIFY_DUNGEON},
+	{"temple",           1 << GENNOTIFY_TEMPLE},
+	{"cave_begin",       1 << GENNOTIFY_CAVE_BEGIN},
+	{"cave_end",         1 << GENNOTIFY_CAVE_END},
+	{"large_cave_begin", 1 << GENNOTIFY_LARGECAVE_BEGIN},
+	{"large_cave_end",   1 << GENNOTIFY_LARGECAVE_END},
+	{"decoration",       1 << GENNOTIFY_DECORATION},
+	{NULL,               0}
+};
+
+struct MapgenDesc {
+	const char *name;
+	bool is_user_visible;
+};
+
+////
+//// Built-in mapgens
+////
+
+static MapgenDesc g_reg_mapgens[] = {
+	{"v5",         true},
+	{"v6",         true},
+	{"v7",         true},
+	{"flat",       true},
+	{"fractal",    true},
+	{"valleys",    true},
+	{"singlenode", true},
+	{"carpathian", true},
+};
+
+STATIC_ASSERT(
+	ARRLEN(g_reg_mapgens) == MAPGEN_INVALID,
+	registered_mapgens_is_wrong_size);
+
+////
+//// Mapgen
+////
+
+Mapgen::Mapgen(int mapgenid, MapgenParams *params, EmergeManager *emerge) :
+	gennotify(emerge->gen_notify_on, &emerge->gen_notify_on_deco_ids)
+{
+	id           = mapgenid;
+	water_level  = params->water_level;
+	mapgen_limit = params->mapgen_limit;
+	flags        = params->flags;
+	csize        = v3s16(1, 1, 1) * (params->chunksize * MAP_BLOCKSIZE);
+
+	/*
+		We are losing half our entropy by doing this, but it is necessary to
+		preserve reverse compatibility.  If the top half of our current 64 bit
+		seeds ever starts getting used, existing worlds will break due to a
+		different hash outcome and no way to differentiate between versions.
+
+		A solution could be to add a new bit to designate that the top half of
+		the seed value should be used, essentially a 1-bit version code, but
+		this would require increasing the total size of a seed to 9 bytes (yuck)
+
+		It's probably okay if this never gets fixed.  4.2 billion possibilities
+		ought to be enough for anyone.
+	*/
+	seed = (s32)params->seed;
+
+	ndef      = emerge->ndef;
+}
+
+
+MapgenType Mapgen::getMapgenType(const std::string &mgname)
+{
+	for (size_t i = 0; i != ARRLEN(g_reg_mapgens); i++) {
+		if (mgname == g_reg_mapgens[i].name)
+			return (MapgenType)i;
+	}
+
+	return MAPGEN_INVALID;
+}
+
+
+const char *Mapgen::getMapgenName(MapgenType mgtype)
+{
+	size_t index = (size_t)mgtype;
+	if (index == MAPGEN_INVALID || index >= ARRLEN(g_reg_mapgens))
+		return "invalid";
+
+	return g_reg_mapgens[index].name;
+}
+
+
+Mapgen *Mapgen::createMapgen(MapgenType mgtype, int mgid,
+	MapgenParams *params, EmergeManager *emerge)
+{
+	switch (mgtype) {
+	case MAPGEN_CARPATHIAN:
+		return new MapgenCarpathian(mgid, (MapgenCarpathianParams *)params, emerge);
+	case MAPGEN_FLAT:
+		return new MapgenFlat(mgid, (MapgenFlatParams *)params, emerge);
+	case MAPGEN_FRACTAL:
+		return new MapgenFractal(mgid, (MapgenFractalParams *)params, emerge);
+	case MAPGEN_SINGLENODE:
+		return new MapgenSinglenode(mgid, (MapgenSinglenodeParams *)params, emerge);
+	case MAPGEN_V5:
+		return new MapgenV5(mgid, (MapgenV5Params *)params, emerge);
+	case MAPGEN_V6:
+		return new MapgenV6(mgid, (MapgenV6Params *)params, emerge);
+	case MAPGEN_V7:
+		return new MapgenV7(mgid, (MapgenV7Params *)params, emerge);
+	case MAPGEN_VALLEYS:
+		return new MapgenValleys(mgid, (MapgenValleysParams *)params, emerge);
+	default:
+		return NULL;
+	}
+}
+
+
+MapgenParams *Mapgen::createMapgenParams(MapgenType mgtype)
+{
+	switch (mgtype) {
+	case MAPGEN_CARPATHIAN:
+		return new MapgenCarpathianParams;
+	case MAPGEN_FLAT:
+		return new MapgenFlatParams;
+	case MAPGEN_FRACTAL:
+		return new MapgenFractalParams;
+	case MAPGEN_SINGLENODE:
+		return new MapgenSinglenodeParams;
+	case MAPGEN_V5:
+		return new MapgenV5Params;
+	case MAPGEN_V6:
+		return new MapgenV6Params;
+	case MAPGEN_V7:
+		return new MapgenV7Params;
+	case MAPGEN_VALLEYS:
+		return new MapgenValleysParams;
+	default:
+		return NULL;
+	}
+}
+
+
+void Mapgen::getMapgenNames(std::vector<const char *> *mgnames, bool include_hidden)
+{
+	for (u32 i = 0; i != ARRLEN(g_reg_mapgens); i++) {
+		if (include_hidden || g_reg_mapgens[i].is_user_visible)
+			mgnames->push_back(g_reg_mapgens[i].name);
+	}
+}
+
+
+u32 Mapgen::getBlockSeed(v3s16 p, s32 seed)
+{
+	return (u32)seed   +
+		p.Z * 38134234 +
+		p.Y * 42123    +
+		p.X * 23;
+}
+
+
+u32 Mapgen::getBlockSeed2(v3s16 p, s32 seed)
+{
+	u32 n = 1619 * p.X + 31337 * p.Y + 52591 * p.Z + 1013 * seed;
+	n = (n >> 13) ^ n;
+	return (n * (n * n * 60493 + 19990303) + 1376312589);
+}
+
+
+// Returns Y one under area minimum if not found
+s16 Mapgen::findGroundLevelFull(v2s16 p2d)
+{
+	const v3s16 &em = vm->m_area.getExtent();
+	s16 y_nodes_max = vm->m_area.MaxEdge.Y;
+	s16 y_nodes_min = vm->m_area.MinEdge.Y;
+	u32 i = vm->m_area.index(p2d.X, y_nodes_max, p2d.Y);
+	s16 y;
+
+	for (y = y_nodes_max; y >= y_nodes_min; y--) {
+		MapNode &n = vm->m_data[i];
+		if (ndef->get(n).walkable)
+			break;
+
+		vm->m_area.add_y(em, i, -1);
+	}
+	return (y >= y_nodes_min) ? y : y_nodes_min - 1;
+}
+
+
+// Returns -MAX_MAP_GENERATION_LIMIT if not found
+s16 Mapgen::findGroundLevel(v2s16 p2d, s16 ymin, s16 ymax)
+{
+	const v3s16 &em = vm->m_area.getExtent();
+	u32 i = vm->m_area.index(p2d.X, ymax, p2d.Y);
+	s16 y;
+
+	for (y = ymax; y >= ymin; y--) {
+		MapNode &n = vm->m_data[i];
+		if (ndef->get(n).walkable)
+			break;
+
+		vm->m_area.add_y(em, i, -1);
+	}
+	return (y >= ymin) ? y : -MAX_MAP_GENERATION_LIMIT;
+}
+
+
+// Returns -MAX_MAP_GENERATION_LIMIT if not found or if ground is found first
+s16 Mapgen::findLiquidSurface(v2s16 p2d, s16 ymin, s16 ymax)
+{
+	const v3s16 &em = vm->m_area.getExtent();
+	u32 i = vm->m_area.index(p2d.X, ymax, p2d.Y);
+	s16 y;
+
+	for (y = ymax; y >= ymin; y--) {
+		MapNode &n = vm->m_data[i];
+		if (ndef->get(n).walkable)
+			return -MAX_MAP_GENERATION_LIMIT;
+
+		if (ndef->get(n).isLiquid())
+			break;
+
+		vm->m_area.add_y(em, i, -1);
+	}
+	return (y >= ymin) ? y : -MAX_MAP_GENERATION_LIMIT;
+}
+
+
+void Mapgen::updateHeightmap(v3s16 nmin, v3s16 nmax)
+{
+	if (!heightmap)
+		return;
+
+	//TimeTaker t("Mapgen::updateHeightmap", NULL, PRECISION_MICRO);
+	int index = 0;
+	for (s16 z = nmin.Z; z <= nmax.Z; z++) {
+		for (s16 x = nmin.X; x <= nmax.X; x++, index++) {
+			s16 y = findGroundLevel(v2s16(x, z), nmin.Y, nmax.Y);
+
+			heightmap[index] = y;
+		}
+	}
+}
+
+
+void Mapgen::getSurfaces(v2s16 p2d, s16 ymin, s16 ymax,
+	s16 *floors, s16 *ceilings, u16 *num_floors, u16 *num_ceilings)
+{
+	u16 floor_i = 0;
+	u16 ceiling_i = 0;
+	const v3s16 &em = vm->m_area.getExtent();
+
+	bool is_walkable = false;
+	u32 vi = vm->m_area.index(p2d.X, ymax, p2d.Y);
+	MapNode mn_max = vm->m_data[vi];
+	bool walkable_above = ndef->get(mn_max).walkable;
+	vm->m_area.add_y(em, vi, -1);
+
+	for (s16 y = ymax - 1; y >= ymin; y--) {
+		MapNode mn = vm->m_data[vi];
+		is_walkable = ndef->get(mn).walkable;
+
+		if (is_walkable && !walkable_above) {
+			floors[floor_i] = y;
+			floor_i++;
+		} else if (!is_walkable && walkable_above) {
+			ceilings[ceiling_i] = y + 1;
+			ceiling_i++;
+		}
+
+		vm->m_area.add_y(em, vi, -1);
+		walkable_above = is_walkable;
+	}
+
+	*num_floors = floor_i;
+	*num_ceilings = ceiling_i;
+}
+
+
+inline bool Mapgen::isLiquidHorizontallyFlowable(u32 vi, v3s16 em)
+{
+	u32 vi_neg_x = vi;
+	vm->m_area.add_x(em, vi_neg_x, -1);
+	if (vm->m_data[vi_neg_x].getContent() != CONTENT_IGNORE) {
+		const ContentFeatures &c_nx = ndef->get(vm->m_data[vi_neg_x]);
+		if (c_nx.floodable && !c_nx.isLiquid())
+			return true;
+	}
+	u32 vi_pos_x = vi;
+	vm->m_area.add_x(em, vi_pos_x, +1);
+	if (vm->m_data[vi_pos_x].getContent() != CONTENT_IGNORE) {
+		const ContentFeatures &c_px = ndef->get(vm->m_data[vi_pos_x]);
+		if (c_px.floodable && !c_px.isLiquid())
+			return true;
+	}
+	u32 vi_neg_z = vi;
+	vm->m_area.add_z(em, vi_neg_z, -1);
+	if (vm->m_data[vi_neg_z].getContent() != CONTENT_IGNORE) {
+		const ContentFeatures &c_nz = ndef->get(vm->m_data[vi_neg_z]);
+		if (c_nz.floodable && !c_nz.isLiquid())
+			return true;
+	}
+	u32 vi_pos_z = vi;
+	vm->m_area.add_z(em, vi_pos_z, +1);
+	if (vm->m_data[vi_pos_z].getContent() != CONTENT_IGNORE) {
+		const ContentFeatures &c_pz = ndef->get(vm->m_data[vi_pos_z]);
+		if (c_pz.floodable && !c_pz.isLiquid())
+			return true;
+	}
+	return false;
+}
+
+void Mapgen::updateLiquid(UniqueQueue<v3s16> *trans_liquid, v3s16 nmin, v3s16 nmax)
+{
+	bool isignored, isliquid, wasignored, wasliquid, waschecked, waspushed;
+	const v3s16 &em  = vm->m_area.getExtent();
+
+	for (s16 z = nmin.Z + 1; z <= nmax.Z - 1; z++)
+	for (s16 x = nmin.X + 1; x <= nmax.X - 1; x++) {
+		wasignored = true;
+		wasliquid = false;
+		waschecked = false;
+		waspushed = false;
+
+		u32 vi = vm->m_area.index(x, nmax.Y, z);
+		for (s16 y = nmax.Y; y >= nmin.Y; y--) {
+			isignored = vm->m_data[vi].getContent() == CONTENT_IGNORE;
+			isliquid = ndef->get(vm->m_data[vi]).isLiquid();
+
+			if (isignored || wasignored || isliquid == wasliquid) {
+				// Neither topmost node of liquid column nor topmost node below column
+				waschecked = false;
+				waspushed = false;
+			} else if (isliquid) {
+				// This is the topmost node in the column
+				bool ispushed = false;
+				if (isLiquidHorizontallyFlowable(vi, em)) {
+					trans_liquid->push_back(v3s16(x, y, z));
+					ispushed = true;
+				}
+				// Remember waschecked and waspushed to avoid repeated
+				// checks/pushes in case the column consists of only this node
+				waschecked = true;
+				waspushed = ispushed;
+			} else {
+				// This is the topmost node below a liquid column
+				u32 vi_above = vi;
+				vm->m_area.add_y(em, vi_above, 1);
+				if (!waspushed && (ndef->get(vm->m_data[vi]).floodable ||
+						(!waschecked && isLiquidHorizontallyFlowable(vi_above, em)))) {
+					// Push back the lowest node in the column which is one
+					// node above this one
+					trans_liquid->push_back(v3s16(x, y + 1, z));
+				}
+			}
+
+			wasliquid = isliquid;
+			wasignored = isignored;
+			vm->m_area.add_y(em, vi, -1);
+		}
+	}
+}
+
+
+void Mapgen::setLighting(u8 light, v3s16 nmin, v3s16 nmax)
+{
+	ScopeProfiler sp(g_profiler, "EmergeThread: mapgen lighting update", SPT_AVG);
+	VoxelArea a(nmin, nmax);
+
+	for (int z = a.MinEdge.Z; z <= a.MaxEdge.Z; z++) {
+		for (int y = a.MinEdge.Y; y <= a.MaxEdge.Y; y++) {
+			u32 i = vm->m_area.index(a.MinEdge.X, y, z);
+			for (int x = a.MinEdge.X; x <= a.MaxEdge.X; x++, i++)
+				vm->m_data[i].param1 = light;
+		}
+	}
+}
+
+
+void Mapgen::lightSpread(VoxelArea &a, v3s16 p, u8 light)
+{
+	if (light <= 1 || !a.contains(p))
+		return;
+
+	u32 vi = vm->m_area.index(p);
+	MapNode &n = vm->m_data[vi];
+
+	// Decay light in each of the banks separately
+	u8 light_day = light & 0x0F;
+	if (light_day > 0)
+		light_day -= 0x01;
+
+	u8 light_night = light & 0xF0;
+	if (light_night > 0)
+		light_night -= 0x10;
+
+	// Bail out only if we have no more light from either bank to propogate, or
+	// we hit a solid block that light cannot pass through.
+	if ((light_day  <= (n.param1 & 0x0F) &&
+		light_night <= (n.param1 & 0xF0)) ||
+		!ndef->get(n).light_propagates)
+		return;
+
+	// Since this recursive function only terminates when there is no light from
+	// either bank left, we need to take the max of both banks into account for
+	// the case where spreading has stopped for one light bank but not the other.
+	light = MYMAX(light_day, n.param1 & 0x0F) |
+			MYMAX(light_night, n.param1 & 0xF0);
+
+	n.param1 = light;
+
+	lightSpread(a, p + v3s16(0, 0, 1), light);
+	lightSpread(a, p + v3s16(0, 1, 0), light);
+	lightSpread(a, p + v3s16(1, 0, 0), light);
+	lightSpread(a, p - v3s16(0, 0, 1), light);
+	lightSpread(a, p - v3s16(0, 1, 0), light);
+	lightSpread(a, p - v3s16(1, 0, 0), light);
+}
+
+
+void Mapgen::calcLighting(v3s16 nmin, v3s16 nmax, v3s16 full_nmin, v3s16 full_nmax,
+	bool propagate_shadow)
+{
+	ScopeProfiler sp(g_profiler, "EmergeThread: mapgen lighting update", SPT_AVG);
+	//TimeTaker t("updateLighting");
+
+	propagateSunlight(nmin, nmax, propagate_shadow);
+	spreadLight(full_nmin, full_nmax);
+
+	//printf("updateLighting: %dms\n", t.stop());
+}
+
+
+void Mapgen::propagateSunlight(v3s16 nmin, v3s16 nmax, bool propagate_shadow)
+{
+	//TimeTaker t("propagateSunlight");
+	VoxelArea a(nmin, nmax);
+	bool block_is_underground = (water_level >= nmax.Y);
+	const v3s16 &em = vm->m_area.getExtent();
+
+	// NOTE: Direct access to the low 4 bits of param1 is okay here because,
+	// by definition, sunlight will never be in the night lightbank.
+
+	for (int z = a.MinEdge.Z; z <= a.MaxEdge.Z; z++) {
+		for (int x = a.MinEdge.X; x <= a.MaxEdge.X; x++) {
+			// see if we can get a light value from the overtop
+			u32 i = vm->m_area.index(x, a.MaxEdge.Y + 1, z);
+			if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
+				if (block_is_underground)
+					continue;
+			} else if ((vm->m_data[i].param1 & 0x0F) != LIGHT_SUN &&
+					propagate_shadow) {
+				continue;
+			}
+			vm->m_area.add_y(em, i, -1);
+
+			for (int y = a.MaxEdge.Y; y >= a.MinEdge.Y; y--) {
+				MapNode &n = vm->m_data[i];
+				if (!ndef->get(n).sunlight_propagates)
+					break;
+				n.param1 = LIGHT_SUN;
+				vm->m_area.add_y(em, i, -1);
+			}
+		}
+	}
+	//printf("propagateSunlight: %dms\n", t.stop());
+}
+
+
+void Mapgen::spreadLight(v3s16 nmin, v3s16 nmax)
+{
+	//TimeTaker t("spreadLight");
+	VoxelArea a(nmin, nmax);
+
+	for (int z = a.MinEdge.Z; z <= a.MaxEdge.Z; z++) {
+		for (int y = a.MinEdge.Y; y <= a.MaxEdge.Y; y++) {
+			u32 i = vm->m_area.index(a.MinEdge.X, y, z);
+			for (int x = a.MinEdge.X; x <= a.MaxEdge.X; x++, i++) {
+				MapNode &n = vm->m_data[i];
+				if (n.getContent() == CONTENT_IGNORE)
+					continue;
+
+				const ContentFeatures &cf = ndef->get(n);
+				if (!cf.light_propagates)
+					continue;
+
+				// TODO(hmmmmm): Abstract away direct param1 accesses with a
+				// wrapper, but something lighter than MapNode::get/setLight
+
+				u8 light_produced = cf.light_source;
+				if (light_produced)
+					n.param1 = light_produced | (light_produced << 4);
+
+				u8 light = n.param1;
+				if (light) {
+					lightSpread(a, v3s16(x,     y,     z + 1), light);
+					lightSpread(a, v3s16(x,     y + 1, z    ), light);
+					lightSpread(a, v3s16(x + 1, y,     z    ), light);
+					lightSpread(a, v3s16(x,     y,     z - 1), light);
+					lightSpread(a, v3s16(x,     y - 1, z    ), light);
+					lightSpread(a, v3s16(x - 1, y,     z    ), light);
+				}
+			}
+		}
+	}
+
+	//printf("spreadLight: %dms\n", t.stop());
+}
+
+
+////
+//// MapgenBasic
+////
+
+MapgenBasic::MapgenBasic(int mapgenid, MapgenParams *params, EmergeManager *emerge)
+	: Mapgen(mapgenid, params, emerge)
+{
+	this->m_emerge = emerge;
+	this->m_bmgr   = emerge->biomemgr;
+
+	//// Here, 'stride' refers to the number of elements needed to skip to index
+	//// an adjacent element for that coordinate in noise/height/biome maps
+	//// (*not* vmanip content map!)
+
+	// Note there is no X stride explicitly defined.  Items adjacent in the X
+	// coordinate are assumed to be adjacent in memory as well (i.e. stride of 1).
+
+	// Number of elements to skip to get to the next Y coordinate
+	this->ystride = csize.X;
+
+	// Number of elements to skip to get to the next Z coordinate
+	this->zstride = csize.X * csize.Y;
+
+	// Z-stride value for maps oversized for 1-down overgeneration
+	this->zstride_1d = csize.X * (csize.Y + 1);
+
+	// Z-stride value for maps oversized for 1-up 1-down overgeneration
+	this->zstride_1u1d = csize.X * (csize.Y + 2);
+
+	//// Allocate heightmap
+	this->heightmap = new s16[csize.X * csize.Z];
+
+	//// Initialize biome generator
+	// TODO(hmmmm): should we have a way to disable biomemanager biomes?
+	biomegen = m_bmgr->createBiomeGen(BIOMEGEN_ORIGINAL, params->bparams, csize);
+	biomemap = biomegen->biomemap;
+
+	//// Look up some commonly used content
+	c_stone              = ndef->getId("mapgen_stone");
+	c_desert_stone       = ndef->getId("mapgen_desert_stone");
+	c_sandstone          = ndef->getId("mapgen_sandstone");
+	c_water_source       = ndef->getId("mapgen_water_source");
+	c_river_water_source = ndef->getId("mapgen_river_water_source");
+	c_lava_source        = ndef->getId("mapgen_lava_source");
+
+	// Fall back to more basic content if not defined
+	// river_water_source cannot fallback to water_source because river water
+	// needs to be non-renewable and have a short flow range.
+	if (c_desert_stone == CONTENT_IGNORE)
+		c_desert_stone = c_stone;
+	if (c_sandstone == CONTENT_IGNORE)
+		c_sandstone = c_stone;
+
+	//// Content used for dungeon generation
+	c_cobble                = ndef->getId("mapgen_cobble");
+	c_mossycobble           = ndef->getId("mapgen_mossycobble");
+	c_stair_cobble          = ndef->getId("mapgen_stair_cobble");
+	c_stair_desert_stone    = ndef->getId("mapgen_stair_desert_stone");
+	c_sandstonebrick        = ndef->getId("mapgen_sandstonebrick");
+	c_stair_sandstone_block = ndef->getId("mapgen_stair_sandstone_block");
+
+	// Fall back to more basic content if not defined
+	if (c_mossycobble == CONTENT_IGNORE)
+		c_mossycobble = c_cobble;
+	if (c_stair_cobble == CONTENT_IGNORE)
+		c_stair_cobble = c_cobble;
+	if (c_stair_desert_stone == CONTENT_IGNORE)
+		c_stair_desert_stone = c_desert_stone;
+	if (c_sandstonebrick == CONTENT_IGNORE)
+		c_sandstonebrick = c_sandstone;
+	if (c_stair_sandstone_block == CONTENT_IGNORE)
+		c_stair_sandstone_block = c_sandstonebrick;
+}
+
+
+MapgenBasic::~MapgenBasic()
+{
+	delete biomegen;
+	delete []heightmap;
+}
+
+
+void MapgenBasic::generateBiomes(MgStoneType *mgstone_type,
+	content_t *biome_stone)
+{
+	// can't generate biomes without a biome generator!
+	assert(biomegen);
+	assert(biomemap);
+
+	const v3s16 &em = vm->m_area.getExtent();
+	u32 index = 0;
+	MgStoneType stone_type = MGSTONE_OTHER;
+	content_t c_biome_stone = c_stone;
+
+	noise_filler_depth->perlinMap2D(node_min.X, node_min.Z);
+
+	for (s16 z = node_min.Z; z <= node_max.Z; z++)
+	for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
+		Biome *biome = NULL;
+		u16 depth_top = 0;
+		u16 base_filler = 0;
+		u16 depth_water_top = 0;
+		u16 depth_riverbed = 0;
+		s16 biome_y_min = -MAX_MAP_GENERATION_LIMIT;
+		u32 vi = vm->m_area.index(x, node_max.Y, z);
+
+		// Check node at base of mapchunk above, either a node of a previously
+		// generated mapchunk or if not, a node of overgenerated base terrain.
+		content_t c_above = vm->m_data[vi + em.X].getContent();
+		bool air_above = c_above == CONTENT_AIR;
+		bool river_water_above = c_above == c_river_water_source;
+		bool water_above = c_above == c_water_source || river_water_above;
+
+		biomemap[index] = BIOME_NONE;
+
+		// If there is air or water above enable top/filler placement, otherwise force
+		// nplaced to stone level by setting a number exceeding any possible filler depth.
+		u16 nplaced = (air_above || water_above) ? 0 : U16_MAX;
+
+		for (s16 y = node_max.Y; y >= node_min.Y; y--) {
+			content_t c = vm->m_data[vi].getContent();
+			// Biome is (re)calculated:
+			// 1. At the surface of stone below air or water.
+			// 2. At the surface of water below air.
+			// 3. When stone or water is detected but biome has not yet been calculated.
+			// 4. When stone or water is detected just below a biome's lower limit.
+			bool is_stone_surface = (c == c_stone) &&
+				(air_above || water_above || !biome || y < biome_y_min); // 1, 3, 4
+
+			bool is_water_surface =
+				(c == c_water_source || c == c_river_water_source) &&
+				(air_above || !biome || y < biome_y_min); // 2, 3, 4
+
+			if (is_stone_surface || is_water_surface) {
+				// (Re)calculate biome
+				biome = biomegen->getBiomeAtIndex(index, y);
+
+				if (biomemap[index] == BIOME_NONE && is_stone_surface)
+					biomemap[index] = biome->index;
+
+				depth_top = biome->depth_top;
+				base_filler = MYMAX(depth_top +
+					biome->depth_filler +
+					noise_filler_depth->result[index], 0.0f);
+				depth_water_top = biome->depth_water_top;
+				depth_riverbed = biome->depth_riverbed;
+				biome_y_min = biome->y_min;
+
+				// Detect stone type for dungeons during every biome calculation.
+				// If none detected the last selected biome stone is chosen.
+				if (biome->c_stone == c_stone)
+					stone_type = MGSTONE_STONE;
+				else if (biome->c_stone == c_desert_stone)
+					stone_type = MGSTONE_DESERT_STONE;
+				else if (biome->c_stone == c_sandstone)
+					stone_type = MGSTONE_SANDSTONE;
+
+				c_biome_stone = biome->c_stone;
+			}
+
+			if (c == c_stone) {
+				content_t c_below = vm->m_data[vi - em.X].getContent();
+
+				// If the node below isn't solid, make this node stone, so that
+				// any top/filler nodes above are structurally supported.
+				// This is done by aborting the cycle of top/filler placement
+				// immediately by forcing nplaced to stone level.
+				if (c_below == CONTENT_AIR
+						|| c_below == c_water_source
+						|| c_below == c_river_water_source)
+					nplaced = U16_MAX;
+
+				if (river_water_above) {
+					if (nplaced < depth_riverbed) {
+						vm->m_data[vi] = MapNode(biome->c_riverbed);
+						nplaced++;
+					} else {
+						nplaced = U16_MAX;  // Disable top/filler placement
+						river_water_above = false;
+					}
+				} else if (nplaced < depth_top) {
+					vm->m_data[vi] = MapNode(biome->c_top);
+					nplaced++;
+				} else if (nplaced < base_filler) {
+					vm->m_data[vi] = MapNode(biome->c_filler);
+					nplaced++;
+				} else {
+					vm->m_data[vi] = MapNode(biome->c_stone);
+					nplaced = U16_MAX;  // Disable top/filler placement
+				}
+
+				air_above = false;
+				water_above = false;
+			} else if (c == c_water_source) {
+				vm->m_data[vi] = MapNode((y > (s32)(water_level - depth_water_top))
+						? biome->c_water_top : biome->c_water);
+				nplaced = 0;  // Enable top/filler placement for next surface
+				air_above = false;
+				water_above = true;
+			} else if (c == c_river_water_source) {
+				vm->m_data[vi] = MapNode(biome->c_river_water);
+				nplaced = 0;  // Enable riverbed placement for next surface
+				air_above = false;
+				water_above = true;
+				river_water_above = true;
+			} else if (c == CONTENT_AIR) {
+				nplaced = 0;  // Enable top/filler placement for next surface
+				air_above = true;
+				water_above = false;
+			} else {  // Possible various nodes overgenerated from neighbouring mapchunks
+				nplaced = U16_MAX;  // Disable top/filler placement
+				air_above = false;
+				water_above = false;
+			}
+
+			vm->m_area.add_y(em, vi, -1);
+		}
+	}
+
+	*mgstone_type = stone_type;
+	*biome_stone = c_biome_stone;
+}
+
+
+void MapgenBasic::dustTopNodes()
+{
+	if (node_max.Y < water_level)
+		return;
+
+	const v3s16 &em = vm->m_area.getExtent();
+	u32 index = 0;
+
+	for (s16 z = node_min.Z; z <= node_max.Z; z++)
+	for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
+		Biome *biome = (Biome *)m_bmgr->getRaw(biomemap[index]);
+
+		if (biome->c_dust == CONTENT_IGNORE)
+			continue;
+
+		u32 vi = vm->m_area.index(x, full_node_max.Y, z);
+		content_t c_full_max = vm->m_data[vi].getContent();
+		s16 y_start;
+
+		if (c_full_max == CONTENT_AIR) {
+			y_start = full_node_max.Y - 1;
+		} else if (c_full_max == CONTENT_IGNORE) {
+			vi = vm->m_area.index(x, node_max.Y + 1, z);
+			content_t c_max = vm->m_data[vi].getContent();
+
+			if (c_max == CONTENT_AIR)
+				y_start = node_max.Y;
+			else
+				continue;
+		} else {
+			continue;
+		}
+
+		vi = vm->m_area.index(x, y_start, z);
+		for (s16 y = y_start; y >= node_min.Y - 1; y--) {
+			if (vm->m_data[vi].getContent() != CONTENT_AIR)
+				break;
+
+			vm->m_area.add_y(em, vi, -1);
+		}
+
+		content_t c = vm->m_data[vi].getContent();
+		if (!ndef->get(c).buildable_to && c != CONTENT_IGNORE && c != biome->c_dust) {
+			vm->m_area.add_y(em, vi, 1);
+			vm->m_data[vi] = MapNode(biome->c_dust);
+		}
+	}
+}
+
+
+void MapgenBasic::generateCaves(s16 max_stone_y, s16 large_cave_depth)
+{
+	if (max_stone_y < node_min.Y)
+		return;
+
+	CavesNoiseIntersection caves_noise(ndef, m_bmgr, csize,
+		&np_cave1, &np_cave2, seed, cave_width);
+
+	caves_noise.generateCaves(vm, node_min, node_max, biomemap);
+
+	if (node_max.Y > large_cave_depth)
+		return;
+
+	PseudoRandom ps(blockseed + 21343);
+	u32 bruises_count = ps.range(0, 2);
+	for (u32 i = 0; i < bruises_count; i++) {
+		CavesRandomWalk cave(ndef, &gennotify, seed, water_level,
+			c_water_source, CONTENT_IGNORE, lava_depth);
+
+		cave.makeCave(vm, node_min, node_max, &ps, true, max_stone_y, heightmap);
+	}
+}
+
+
+bool MapgenBasic::generateCaverns(s16 max_stone_y)
+{
+	if (node_min.Y > max_stone_y || node_min.Y > cavern_limit)
+		return false;
+
+	CavernsNoise caverns_noise(ndef, csize, &np_cavern,
+		seed, cavern_limit, cavern_taper, cavern_threshold);
+
+	return caverns_noise.generateCaverns(vm, node_min, node_max);
+}
+
+
+void MapgenBasic::generateDungeons(s16 max_stone_y,
+	MgStoneType stone_type, content_t biome_stone)
+{
+	if (max_stone_y < node_min.Y)
+		return;
+
+	DungeonParams dp;
+
+	dp.seed             = seed;
+	dp.c_water          = c_water_source;
+	dp.c_river_water    = c_river_water_source;
+
+	dp.only_in_ground   = true;
+	dp.corridor_len_min = 1;
+	dp.corridor_len_max = 13;
+	dp.rooms_min        = 2;
+	dp.rooms_max        = 16;
+	dp.y_min            = -MAX_MAP_GENERATION_LIMIT;
+	dp.y_max            = MAX_MAP_GENERATION_LIMIT;
+
+	dp.np_density       = nparams_dungeon_density;
+	dp.np_alt_wall      = nparams_dungeon_alt_wall;
+
+	switch (stone_type) {
+	default:
+	case MGSTONE_STONE:
+		dp.c_wall              = c_cobble;
+		dp.c_alt_wall          = c_mossycobble;
+		dp.c_stair             = c_stair_cobble;
+
+		dp.diagonal_dirs       = false;
+		dp.holesize            = v3s16(1, 2, 1);
+		dp.room_size_min       = v3s16(4, 4, 4);
+		dp.room_size_max       = v3s16(8, 6, 8);
+		dp.room_size_large_min = v3s16(8, 8, 8);
+		dp.room_size_large_max = v3s16(16, 16, 16);
+		dp.notifytype          = GENNOTIFY_DUNGEON;
+		break;
+	case MGSTONE_DESERT_STONE:
+		dp.c_wall              = c_desert_stone;
+		dp.c_alt_wall          = CONTENT_IGNORE;
+		dp.c_stair             = c_stair_desert_stone;
+
+		dp.diagonal_dirs       = true;
+		dp.holesize            = v3s16(2, 3, 2);
+		dp.room_size_min       = v3s16(6, 9, 6);
+		dp.room_size_max       = v3s16(10, 11, 10);
+		dp.room_size_large_min = v3s16(10, 13, 10);
+		dp.room_size_large_max = v3s16(18, 21, 18);
+		dp.notifytype          = GENNOTIFY_TEMPLE;
+		break;
+	case MGSTONE_SANDSTONE:
+		dp.c_wall              = c_sandstonebrick;
+		dp.c_alt_wall          = CONTENT_IGNORE;
+		dp.c_stair             = c_stair_sandstone_block;
+
+		dp.diagonal_dirs       = false;
+		dp.holesize            = v3s16(2, 2, 2);
+		dp.room_size_min       = v3s16(6, 4, 6);
+		dp.room_size_max       = v3s16(10, 6, 10);
+		dp.room_size_large_min = v3s16(10, 8, 10);
+		dp.room_size_large_max = v3s16(18, 16, 18);
+		dp.notifytype          = GENNOTIFY_DUNGEON;
+		break;
+	case MGSTONE_OTHER:
+		dp.c_wall              = biome_stone;
+		dp.c_alt_wall          = biome_stone;
+		dp.c_stair             = biome_stone;
+
+		dp.diagonal_dirs       = false;
+		dp.holesize            = v3s16(1, 2, 1);
+		dp.room_size_min       = v3s16(4, 4, 4);
+		dp.room_size_max       = v3s16(8, 6, 8);
+		dp.room_size_large_min = v3s16(8, 8, 8);
+		dp.room_size_large_max = v3s16(16, 16, 16);
+		dp.notifytype          = GENNOTIFY_DUNGEON;
+		break;
+	}
+
+	DungeonGen dgen(ndef, &gennotify, &dp);
+	dgen.generate(vm, blockseed, full_node_min, full_node_max);
+}
+
+
+////
+//// GenerateNotifier
+////
+
+GenerateNotifier::GenerateNotifier(u32 notify_on,
+	std::set<u32> *notify_on_deco_ids)
+{
+	m_notify_on = notify_on;
+	m_notify_on_deco_ids = notify_on_deco_ids;
+}
+
+
+void GenerateNotifier::setNotifyOn(u32 notify_on)
+{
+	m_notify_on = notify_on;
+}
+
+
+void GenerateNotifier::setNotifyOnDecoIds(std::set<u32> *notify_on_deco_ids)
+{
+	m_notify_on_deco_ids = notify_on_deco_ids;
+}
+
+
+bool GenerateNotifier::addEvent(GenNotifyType type, v3s16 pos, u32 id)
+{
+	if (!(m_notify_on & (1 << type)))
+		return false;
+
+	if (type == GENNOTIFY_DECORATION &&
+		m_notify_on_deco_ids->find(id) == m_notify_on_deco_ids->end())
+		return false;
+
+	GenNotifyEvent gne;
+	gne.type = type;
+	gne.pos  = pos;
+	gne.id   = id;
+	m_notify_events.push_back(gne);
+
+	return true;
+}
+
+
+void GenerateNotifier::getEvents(
+	std::map<std::string, std::vector<v3s16> > &event_map,
+	bool peek_events)
+{
+	std::list<GenNotifyEvent>::iterator it;
+
+	for (it = m_notify_events.begin(); it != m_notify_events.end(); ++it) {
+		GenNotifyEvent &gn = *it;
+		std::string name = (gn.type == GENNOTIFY_DECORATION) ?
+			"decoration#"+ itos(gn.id) :
+			flagdesc_gennotify[gn.type].name;
+
+		event_map[name].push_back(gn.pos);
+	}
+
+	if (!peek_events)
+		m_notify_events.clear();
+}
+
+
+////
+//// MapgenParams
+////
+
+
+MapgenParams::~MapgenParams()
+{
+	delete bparams;
+}
+
+
+void MapgenParams::readParams(const Settings *settings)
+{
+	std::string seed_str;
+	const char *seed_name = (settings == g_settings) ? "fixed_map_seed" : "seed";
+
+	if (settings->getNoEx(seed_name, seed_str)) {
+		if (!seed_str.empty())
+			seed = read_seed(seed_str.c_str());
+		else
+			myrand_bytes(&seed, sizeof(seed));
+	}
+
+	std::string mg_name;
+	if (settings->getNoEx("mg_name", mg_name)) {
+		mgtype = Mapgen::getMapgenType(mg_name);
+		if (mgtype == MAPGEN_INVALID)
+			mgtype = MAPGEN_DEFAULT;
+	}
+
+	settings->getS16NoEx("water_level", water_level);
+	settings->getS16NoEx("mapgen_limit", mapgen_limit);
+	settings->getS16NoEx("chunksize", chunksize);
+	settings->getFlagStrNoEx("mg_flags", flags, flagdesc_mapgen);
+
+	delete bparams;
+	bparams = BiomeManager::createBiomeParams(BIOMEGEN_ORIGINAL);
+	if (bparams) {
+		bparams->readParams(settings);
+		bparams->seed = seed;
+	}
+}
+
+
+void MapgenParams::writeParams(Settings *settings) const
+{
+	settings->set("mg_name", Mapgen::getMapgenName(mgtype));
+	settings->setU64("seed", seed);
+	settings->setS16("water_level", water_level);
+	settings->setS16("mapgen_limit", mapgen_limit);
+	settings->setS16("chunksize", chunksize);
+	settings->setFlagStr("mg_flags", flags, flagdesc_mapgen, U32_MAX);
+
+	if (bparams)
+		bparams->writeParams(settings);
+}
+
+// Calculate edges of outermost generated mapchunks (less than
+// 'mapgen_limit'), and corresponding exact limits for SAO entities.
+void MapgenParams::calcMapgenEdges()
+{
+	if (m_mapgen_edges_calculated)
+		return;
+
+	// Central chunk offset, in blocks
+	s16 ccoff_b = -chunksize / 2;
+	// Chunksize, in nodes
+	s32 csize_n = chunksize * MAP_BLOCKSIZE;
+	// Minp/maxp of central chunk, in nodes
+	s16 ccmin = ccoff_b * MAP_BLOCKSIZE;
+	s16 ccmax = ccmin + csize_n - 1;
+	// Fullminp/fullmaxp of central chunk, in nodes
+	s16 ccfmin = ccmin - MAP_BLOCKSIZE;
+	s16 ccfmax = ccmax + MAP_BLOCKSIZE;
+	// Effective mapgen limit, in blocks
+	// Uses same calculation as ServerMap::blockpos_over_mapgen_limit(v3s16 p)
+	s16 mapgen_limit_b = rangelim(mapgen_limit,
+		0, MAX_MAP_GENERATION_LIMIT) / MAP_BLOCKSIZE;
+	// Effective mapgen limits, in nodes
+	s16 mapgen_limit_min = -mapgen_limit_b * MAP_BLOCKSIZE;
+	s16 mapgen_limit_max = (mapgen_limit_b + 1) * MAP_BLOCKSIZE - 1;
+	// Number of complete chunks from central chunk fullminp/fullmaxp
+	// to effective mapgen limits.
+	s16 numcmin = MYMAX((ccfmin - mapgen_limit_min) / csize_n, 0);
+	s16 numcmax = MYMAX((mapgen_limit_max - ccfmax) / csize_n, 0);
+	// Mapgen edges, in nodes
+	mapgen_edge_min = ccmin - numcmin * csize_n;
+	mapgen_edge_max = ccmax + numcmax * csize_n;
+	// SAO position limits, in Irrlicht units
+	m_sao_limit_min = mapgen_edge_min * BS - 3.0f;
+	m_sao_limit_max = mapgen_edge_max * BS + 3.0f;
+
+	m_mapgen_edges_calculated = true;
+}
+
+
+bool MapgenParams::saoPosOverLimit(const v3f &p)
+{
+	if (!m_mapgen_edges_calculated)
+		calcMapgenEdges();
+
+	return p.X < m_sao_limit_min ||
+		p.X > m_sao_limit_max ||
+		p.Y < m_sao_limit_min ||
+		p.Y > m_sao_limit_max ||
+		p.Z < m_sao_limit_min ||
+		p.Z > m_sao_limit_max;
+}
+
+
+s32 MapgenParams::getSpawnRangeMax()
+{
+	calcMapgenEdges();
+
+	return MYMIN(-mapgen_edge_min, mapgen_edge_max);
+}