Move files to subdirectories (#6599)

* Move files around

1 files changed, 0 insertions, 677 deletions

diff --git a/src/dungeongen.cpp b/src/dungeongen.cpp
deleted file mode 100644
index fa867b398..000000000
--- a/src/dungeongen.cpp
+++ /dev/null
@@ -1,677 +0,0 @@
-/*
-Minetest
-Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU 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 "dungeongen.h"
-#include "mapgen.h"
-#include "voxel.h"
-#include "noise.h"
-#include "mapblock.h"
-#include "mapnode.h"
-#include "map.h"
-#include "nodedef.h"
-#include "settings.h"
-
-//#define DGEN_USE_TORCHES
-
-NoiseParams nparams_dungeon_density(0.9, 0.5, v3f(500.0, 500.0, 500.0), 0, 2, 0.8, 2.0);
-NoiseParams nparams_dungeon_alt_wall(-0.4, 1.0, v3f(40.0, 40.0, 40.0), 32474, 6, 1.1, 2.0);
-
-
-///////////////////////////////////////////////////////////////////////////////
-
-
-DungeonGen::DungeonGen(INodeDefManager *ndef,
-	GenerateNotifier *gennotify, DungeonParams *dparams)
-{
-	assert(ndef);
-
-	this->ndef      = ndef;
-	this->gennotify = gennotify;
-
-#ifdef DGEN_USE_TORCHES
-	c_torch  = ndef->getId("default:torch");
-#endif
-
-	if (dparams) {
-		memcpy(&dp, dparams, sizeof(dp));
-	} else {
-		// Default dungeon parameters
-		dp.seed = 0;
-
-		dp.c_water       = ndef->getId("mapgen_water_source");
-		dp.c_river_water = ndef->getId("mapgen_river_water_source");
-		dp.c_wall        = ndef->getId("mapgen_cobble");
-		dp.c_alt_wall    = ndef->getId("mapgen_mossycobble");
-		dp.c_stair       = ndef->getId("mapgen_stair_cobble");
-
-		if (dp.c_river_water == CONTENT_IGNORE)
-			dp.c_river_water = ndef->getId("mapgen_water_source");
-
-		dp.diagonal_dirs       = false;
-		dp.only_in_ground      = true;
-		dp.holesize            = v3s16(1, 2, 1);
-		dp.corridor_len_min    = 1;
-		dp.corridor_len_max    = 13;
-		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.rooms_min           = 2;
-		dp.rooms_max           = 16;
-		dp.y_min               = -MAX_MAP_GENERATION_LIMIT;
-		dp.y_max               = MAX_MAP_GENERATION_LIMIT;
-		dp.notifytype          = GENNOTIFY_DUNGEON;
-
-		dp.np_density  = nparams_dungeon_density;
-		dp.np_alt_wall = nparams_dungeon_alt_wall;
-	}
-}
-
-
-void DungeonGen::generate(MMVManip *vm, u32 bseed, v3s16 nmin, v3s16 nmax)
-{
-	assert(vm);
-
-	//TimeTaker t("gen dungeons");
-	if (nmin.Y < dp.y_min || nmax.Y > dp.y_max)
-		return;
-
-	float nval_density = NoisePerlin3D(&dp.np_density, nmin.X, nmin.Y, nmin.Z, dp.seed);
-	if (nval_density < 1.0f)
-		return;
-
-	static const bool preserve_ignore = !g_settings->getBool("projecting_dungeons");
-
-	this->vm = vm;
-	this->blockseed = bseed;
-	random.seed(bseed + 2);
-
-	// Dungeon generator doesn't modify places which have this set
-	vm->clearFlag(VMANIP_FLAG_DUNGEON_INSIDE | VMANIP_FLAG_DUNGEON_PRESERVE);
-
-	if (dp.only_in_ground) {
-		// Set all air and water to be untouchable to make dungeons open to
-		// caves and open air. Optionally set ignore to be untouchable to
-		// prevent protruding dungeons.
-		for (s16 z = nmin.Z; z <= nmax.Z; z++) {
-			for (s16 y = nmin.Y; y <= nmax.Y; y++) {
-				u32 i = vm->m_area.index(nmin.X, y, z);
-				for (s16 x = nmin.X; x <= nmax.X; x++) {
-					content_t c = vm->m_data[i].getContent();
-					if (c == CONTENT_AIR || c == dp.c_water ||
-							(preserve_ignore && c == CONTENT_IGNORE) ||
-							c == dp.c_river_water)
-						vm->m_flags[i] |= VMANIP_FLAG_DUNGEON_PRESERVE;
-					i++;
-				}
-			}
-		}
-	}
-
-	// Add them
-	for (u32 i = 0; i < floor(nval_density); i++)
-		makeDungeon(v3s16(1, 1, 1) * MAP_BLOCKSIZE);
-
-	// Optionally convert some structure to alternative structure
-	if (dp.c_alt_wall == CONTENT_IGNORE)
-		return;
-
-	for (s16 z = nmin.Z; z <= nmax.Z; z++)
-	for (s16 y = nmin.Y; y <= nmax.Y; y++) {
-		u32 i = vm->m_area.index(nmin.X, y, z);
-		for (s16 x = nmin.X; x <= nmax.X; x++) {
-			if (vm->m_data[i].getContent() == dp.c_wall) {
-				if (NoisePerlin3D(&dp.np_alt_wall, x, y, z, blockseed) > 0.0f)
-					vm->m_data[i].setContent(dp.c_alt_wall);
-			}
-			i++;
-		}
-	}
-
-	//printf("== gen dungeons: %dms\n", t.stop());
-}
-
-
-void DungeonGen::makeDungeon(v3s16 start_padding)
-{
-	const v3s16 &areasize = vm->m_area.getExtent();
-	v3s16 roomsize;
-	v3s16 roomplace;
-
-	/*
-		Find place for first room.
-		There is a 1 in 4 chance of the first room being 'large',
-		all other rooms are not 'large'.
-	*/
-	bool fits = false;
-	for (u32 i = 0; i < 100 && !fits; i++) {
-		bool is_large_room = ((random.next() & 3) == 1);
-		if (is_large_room) {
-			roomsize.Z = random.range(
-				dp.room_size_large_min.Z, dp.room_size_large_max.Z);
-			roomsize.Y = random.range(
-				dp.room_size_large_min.Y, dp.room_size_large_max.Y);
-			roomsize.X = random.range(
-				dp.room_size_large_min.X, dp.room_size_large_max.X);
-		} else {
-			roomsize.Z = random.range(dp.room_size_min.Z, dp.room_size_max.Z);
-			roomsize.Y = random.range(dp.room_size_min.Y, dp.room_size_max.Y);
-			roomsize.X = random.range(dp.room_size_min.X, dp.room_size_max.X);
-		}
-
-		// start_padding is used to disallow starting the generation of
-		// a dungeon in a neighboring generation chunk
-		roomplace = vm->m_area.MinEdge + start_padding;
-		roomplace.Z += random.range(0, areasize.Z - roomsize.Z - start_padding.Z);
-		roomplace.Y += random.range(0, areasize.Y - roomsize.Y - start_padding.Y);
-		roomplace.X += random.range(0, areasize.X - roomsize.X - start_padding.X);
-
-		/*
-			Check that we're not putting the room to an unknown place,
-			otherwise it might end up floating in the air
-		*/
-		fits = true;
-		for (s16 z = 0; z < roomsize.Z; z++)
-		for (s16 y = 0; y < roomsize.Y; y++)
-		for (s16 x = 0; x < roomsize.X; x++) {
-			v3s16 p = roomplace + v3s16(x, y, z);
-			u32 vi = vm->m_area.index(p);
-			if ((vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE) ||
-					vm->m_data[vi].getContent() == CONTENT_IGNORE) {
-				fits = false;
-				break;
-			}
-		}
-	}
-	// No place found
-	if (!fits)
-		return;
-
-	/*
-		Stores the center position of the last room made, so that
-		a new corridor can be started from the last room instead of
-		the new room, if chosen so.
-	*/
-	v3s16 last_room_center = roomplace + v3s16(roomsize.X / 2, 1, roomsize.Z / 2);
-
-	u32 room_count = random.range(dp.rooms_min, dp.rooms_max);
-	for (u32 i = 0; i < room_count; i++) {
-		// Make a room to the determined place
-		makeRoom(roomsize, roomplace);
-
-		v3s16 room_center = roomplace + v3s16(roomsize.X / 2, 1, roomsize.Z / 2);
-		if (gennotify)
-			gennotify->addEvent(dp.notifytype, room_center);
-
-#ifdef DGEN_USE_TORCHES
-		// Place torch at room center (for testing)
-		vm->m_data[vm->m_area.index(room_center)] = MapNode(c_torch);
-#endif
-
-		// Quit if last room
-		if (i == room_count - 1)
-			break;
-
-		// Determine walker start position
-
-		bool start_in_last_room = (random.range(0, 2) != 0);
-
-		v3s16 walker_start_place;
-
-		if (start_in_last_room) {
-			walker_start_place = last_room_center;
-		} else {
-			walker_start_place = room_center;
-			// Store center of current room as the last one
-			last_room_center = room_center;
-		}
-
-		// Create walker and find a place for a door
-		v3s16 doorplace;
-		v3s16 doordir;
-
-		m_pos = walker_start_place;
-		if (!findPlaceForDoor(doorplace, doordir))
-			return;
-
-		if (random.range(0, 1) == 0)
-			// Make the door
-			makeDoor(doorplace, doordir);
-		else
-			// Don't actually make a door
-			doorplace -= doordir;
-
-		// Make a random corridor starting from the door
-		v3s16 corridor_end;
-		v3s16 corridor_end_dir;
-		makeCorridor(doorplace, doordir, corridor_end, corridor_end_dir);
-
-		// Find a place for a random sized room
-		roomsize.Z = random.range(dp.room_size_min.Z, dp.room_size_max.Z);
-		roomsize.Y = random.range(dp.room_size_min.Y, dp.room_size_max.Y);
-		roomsize.X = random.range(dp.room_size_min.X, dp.room_size_max.X);
-
-		m_pos = corridor_end;
-		m_dir = corridor_end_dir;
-		if (!findPlaceForRoomDoor(roomsize, doorplace, doordir, roomplace))
-			return;
-
-		if (random.range(0, 1) == 0)
-			// Make the door
-			makeDoor(doorplace, doordir);
-		else
-			// Don't actually make a door
-			roomplace -= doordir;
-
-	}
-}
-
-
-void DungeonGen::makeRoom(v3s16 roomsize, v3s16 roomplace)
-{
-	MapNode n_wall(dp.c_wall);
-	MapNode n_air(CONTENT_AIR);
-
-	// Make +-X walls
-	for (s16 z = 0; z < roomsize.Z; z++)
-	for (s16 y = 0; y < roomsize.Y; y++) {
-		{
-			v3s16 p = roomplace + v3s16(0, y, z);
-			if (!vm->m_area.contains(p))
-				continue;
-			u32 vi = vm->m_area.index(p);
-			if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
-				continue;
-			vm->m_data[vi] = n_wall;
-		}
-		{
-			v3s16 p = roomplace + v3s16(roomsize.X - 1, y, z);
-			if (!vm->m_area.contains(p))
-				continue;
-			u32 vi = vm->m_area.index(p);
-			if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
-				continue;
-			vm->m_data[vi] = n_wall;
-		}
-	}
-
-	// Make +-Z walls
-	for (s16 x = 0; x < roomsize.X; x++)
-	for (s16 y = 0; y < roomsize.Y; y++) {
-		{
-			v3s16 p = roomplace + v3s16(x, y, 0);
-			if (!vm->m_area.contains(p))
-				continue;
-			u32 vi = vm->m_area.index(p);
-			if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
-				continue;
-			vm->m_data[vi] = n_wall;
-		}
-		{
-			v3s16 p = roomplace + v3s16(x, y, roomsize.Z - 1);
-			if (!vm->m_area.contains(p))
-				continue;
-			u32 vi = vm->m_area.index(p);
-			if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
-				continue;
-			vm->m_data[vi] = n_wall;
-		}
-	}
-
-	// Make +-Y walls (floor and ceiling)
-	for (s16 z = 0; z < roomsize.Z; z++)
-	for (s16 x = 0; x < roomsize.X; x++) {
-		{
-			v3s16 p = roomplace + v3s16(x, 0, z);
-			if (!vm->m_area.contains(p))
-				continue;
-			u32 vi = vm->m_area.index(p);
-			if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
-				continue;
-			vm->m_data[vi] = n_wall;
-		}
-		{
-			v3s16 p = roomplace + v3s16(x,roomsize. Y - 1, z);
-			if (!vm->m_area.contains(p))
-				continue;
-			u32 vi = vm->m_area.index(p);
-			if (vm->m_flags[vi] & VMANIP_FLAG_DUNGEON_UNTOUCHABLE)
-				continue;
-			vm->m_data[vi] = n_wall;
-		}
-	}
-
-	// Fill with air
-	for (s16 z = 1; z < roomsize.Z - 1; z++)
-	for (s16 y = 1; y < roomsize.Y - 1; y++)
-	for (s16 x = 1; x < roomsize.X - 1; x++) {
-		v3s16 p = roomplace + v3s16(x, y, z);
-		if (!vm->m_area.contains(p))
-			continue;
-		u32 vi = vm->m_area.index(p);
-		vm->m_flags[vi] |= VMANIP_FLAG_DUNGEON_UNTOUCHABLE;
-		vm->m_data[vi] = n_air;
-	}
-}
-
-
-void DungeonGen::makeFill(v3s16 place, v3s16 size,
-	u8 avoid_flags, MapNode n, u8 or_flags)
-{
-	for (s16 z = 0; z < size.Z; z++)
-	for (s16 y = 0; y < size.Y; y++)
-	for (s16 x = 0; x < size.X; x++) {
-		v3s16 p = place + v3s16(x, y, z);
-		if (!vm->m_area.contains(p))
-			continue;
-		u32 vi = vm->m_area.index(p);
-		if (vm->m_flags[vi] & avoid_flags)
-			continue;
-		vm->m_flags[vi] |= or_flags;
-		vm->m_data[vi] = n;
-	}
-}
-
-
-void DungeonGen::makeHole(v3s16 place)
-{
-	makeFill(place, dp.holesize, 0, MapNode(CONTENT_AIR),
-		VMANIP_FLAG_DUNGEON_INSIDE);
-}
-
-
-void DungeonGen::makeDoor(v3s16 doorplace, v3s16 doordir)
-{
-	makeHole(doorplace);
-
-#ifdef DGEN_USE_TORCHES
-	// Place torch (for testing)
-	vm->m_data[vm->m_area.index(doorplace)] = MapNode(c_torch);
-#endif
-}
-
-
-void DungeonGen::makeCorridor(v3s16 doorplace, v3s16 doordir,
-	v3s16 &result_place, v3s16 &result_dir)
-{
-	makeHole(doorplace);
-	v3s16 p0 = doorplace;
-	v3s16 dir = doordir;
-	u32 length = random.range(dp.corridor_len_min, dp.corridor_len_max);
-	u32 partlength = random.range(dp.corridor_len_min, dp.corridor_len_max);
-	u32 partcount = 0;
-	s16 make_stairs = 0;
-
-	if (random.next() % 2 == 0 && partlength >= 3)
-		make_stairs = random.next() % 2 ? 1 : -1;
-
-	for (u32 i = 0; i < length; i++) {
-		v3s16 p = p0 + dir;
-		if (partcount != 0)
-			p.Y += make_stairs;
-
-		// Check segment of minimum size corridor is in voxelmanip
-		if (vm->m_area.contains(p) && vm->m_area.contains(p + v3s16(0, 1, 0))) {
-			if (make_stairs) {
-				makeFill(p + v3s16(-1, -1, -1),
-					dp.holesize + v3s16(2, 3, 2),
-					VMANIP_FLAG_DUNGEON_UNTOUCHABLE,
-					MapNode(dp.c_wall),
-					0);
-				makeHole(p);
-				makeHole(p - dir);
-
-				// TODO: fix stairs code so it works 100%
-				// (quite difficult)
-
-				// exclude stairs from the bottom step
-				// exclude stairs from diagonal steps
-				if (((dir.X ^ dir.Z) & 1) &&
-						(((make_stairs ==  1) && i != 0) ||
-						((make_stairs == -1) && i != length - 1))) {
-					// rotate face 180 deg if
-					// making stairs backwards
-					int facedir = dir_to_facedir(dir * make_stairs);
-					v3s16 ps = p;
-					u16 stair_width = (dir.Z != 0) ? dp.holesize.X : dp.holesize.Z;
-					// Stair width direction vector
-					v3s16 swv = (dir.Z != 0) ? v3s16(1, 0, 0) : v3s16(0, 0, 1);
-
-					for (u16 st = 0; st < stair_width; st++) {
-						u32 vi = vm->m_area.index(ps.X - dir.X, ps.Y - 1, ps.Z - dir.Z);
-						if (vm->m_area.contains(ps + v3s16(-dir.X, -1, -dir.Z)) &&
-								vm->m_data[vi].getContent() == dp.c_wall)
-							vm->m_data[vi] = MapNode(dp.c_stair, 0, facedir);
-
-						vi = vm->m_area.index(ps.X, ps.Y, ps.Z);
-						if (vm->m_area.contains(ps) &&
-								vm->m_data[vi].getContent() == dp.c_wall)
-							vm->m_data[vi] = MapNode(dp.c_stair, 0, facedir);
-
-						ps += swv;
-					}
-				}
-			} else {
-				makeFill(p + v3s16(-1, -1, -1),
-					dp.holesize + v3s16(2, 2, 2),
-					VMANIP_FLAG_DUNGEON_UNTOUCHABLE,
-					MapNode(dp.c_wall),
-					0);
-				makeHole(p);
-			}
-
-			p0 = p;
-		} else {
-			// Can't go here, turn away
-			dir = turn_xz(dir, random.range(0, 1));
-			make_stairs = -make_stairs;
-			partcount = 0;
-			partlength = random.range(1, length);
-			continue;
-		}
-
-		partcount++;
-		if (partcount >= partlength) {
-			partcount = 0;
-
-			dir = random_turn(random, dir);
-
-			partlength = random.range(1, length);
-
-			make_stairs = 0;
-			if (random.next() % 2 == 0 && partlength >= 3)
-				make_stairs = random.next() % 2 ? 1 : -1;
-		}
-	}
-	result_place = p0;
-	result_dir = dir;
-}
-
-
-bool DungeonGen::findPlaceForDoor(v3s16 &result_place, v3s16 &result_dir)
-{
-	for (u32 i = 0; i < 100; i++) {
-		v3s16 p = m_pos + m_dir;
-		v3s16 p1 = p + v3s16(0, 1, 0);
-		if (!vm->m_area.contains(p) || !vm->m_area.contains(p1) || i % 4 == 0) {
-			randomizeDir();
-			continue;
-		}
-		if (vm->getNodeNoExNoEmerge(p).getContent() == dp.c_wall &&
-				vm->getNodeNoExNoEmerge(p1).getContent() == dp.c_wall) {
-			// Found wall, this is a good place!
-			result_place = p;
-			result_dir = m_dir;
-			// Randomize next direction
-			randomizeDir();
-			return true;
-		}
-		/*
-			Determine where to move next
-		*/
-		// Jump one up if the actual space is there
-		if (vm->getNodeNoExNoEmerge(p +
-				v3s16(0, 0, 0)).getContent() == dp.c_wall &&
-				vm->getNodeNoExNoEmerge(p +
-				v3s16(0, 1, 0)).getContent() == CONTENT_AIR &&
-				vm->getNodeNoExNoEmerge(p +
-				v3s16(0, 2, 0)).getContent() == CONTENT_AIR)
-			p += v3s16(0,1,0);
-		// Jump one down if the actual space is there
-		if (vm->getNodeNoExNoEmerge(p +
-				v3s16(0, 1, 0)).getContent() == dp.c_wall &&
-				vm->getNodeNoExNoEmerge(p +
-				v3s16(0, 0, 0)).getContent() == CONTENT_AIR &&
-				vm->getNodeNoExNoEmerge(p +
-				v3s16(0, -1, 0)).getContent() == CONTENT_AIR)
-			p += v3s16(0, -1, 0);
-		// Check if walking is now possible
-		if (vm->getNodeNoExNoEmerge(p).getContent() != CONTENT_AIR ||
-				vm->getNodeNoExNoEmerge(p +
-				v3s16(0, 1, 0)).getContent() != CONTENT_AIR) {
-			// Cannot continue walking here
-			randomizeDir();
-			continue;
-		}
-		// Move there
-		m_pos = p;
-	}
-	return false;
-}
-
-
-bool DungeonGen::findPlaceForRoomDoor(v3s16 roomsize, v3s16 &result_doorplace,
-	v3s16 &result_doordir, v3s16 &result_roomplace)
-{
-	for (s16 trycount = 0; trycount < 30; trycount++) {
-		v3s16 doorplace;
-		v3s16 doordir;
-		bool r = findPlaceForDoor(doorplace, doordir);
-		if (!r)
-			continue;
-		v3s16 roomplace;
-		// X east, Z north, Y up
-		if (doordir == v3s16(1, 0, 0)) // X+
-			roomplace = doorplace +
-				v3s16(0, -1, random.range(-roomsize.Z + 2, -2));
-		if (doordir == v3s16(-1, 0, 0)) // X-
-			roomplace = doorplace +
-				v3s16(-roomsize.X + 1, -1, random.range(-roomsize.Z + 2, -2));
-		if (doordir == v3s16(0, 0, 1)) // Z+
-			roomplace = doorplace +
-				v3s16(random.range(-roomsize.X + 2, -2), -1, 0);
-		if (doordir == v3s16(0, 0, -1)) // Z-
-			roomplace = doorplace +
-				v3s16(random.range(-roomsize.X + 2, -2), -1, -roomsize.Z + 1);
-
-		// Check fit
-		bool fits = true;
-		for (s16 z = 1; z < roomsize.Z - 1; z++)
-		for (s16 y = 1; y < roomsize.Y - 1; y++)
-		for (s16 x = 1; x < roomsize.X - 1; x++) {
-			v3s16 p = roomplace + v3s16(x, y, z);
-			if (!vm->m_area.contains(p)) {
-				fits = false;
-				break;
-			}
-			if (vm->m_flags[vm->m_area.index(p)] & VMANIP_FLAG_DUNGEON_INSIDE) {
-				fits = false;
-				break;
-			}
-		}
-		if (!fits) {
-			// Find new place
-			continue;
-		}
-		result_doorplace = doorplace;
-		result_doordir   = doordir;
-		result_roomplace = roomplace;
-		return true;
-	}
-	return false;
-}
-
-
-v3s16 rand_ortho_dir(PseudoRandom &random, bool diagonal_dirs)
-{
-	// Make diagonal directions somewhat rare
-	if (diagonal_dirs && (random.next() % 4 == 0)) {
-		v3s16 dir;
-		int trycount = 0;
-
-		do {
-			trycount++;
-
-			dir.Z = random.next() % 3 - 1;
-			dir.Y = 0;
-			dir.X = random.next() % 3 - 1;
-		} while ((dir.X == 0 || dir.Z == 0) && trycount < 10);
-
-		return dir;
-	}
-
-	if (random.next() % 2 == 0)
-		return random.next() % 2 ? v3s16(-1, 0, 0) : v3s16(1, 0, 0);
-
-	return random.next() % 2 ? v3s16(0, 0, -1) : v3s16(0, 0, 1);
-}
-
-
-v3s16 turn_xz(v3s16 olddir, int t)
-{
-	v3s16 dir;
-	if (t == 0) {
-		// Turn right
-		dir.X = olddir.Z;
-		dir.Z = -olddir.X;
-		dir.Y = olddir.Y;
-	} else {
-		// Turn left
-		dir.X = -olddir.Z;
-		dir.Z = olddir.X;
-		dir.Y = olddir.Y;
-	}
-	return dir;
-}
-
-
-v3s16 random_turn(PseudoRandom &random, v3s16 olddir)
-{
-	int turn = random.range(0, 2);
-	v3s16 dir;
-	if (turn == 0)
-		// Go straight
-		dir = olddir;
-	else if (turn == 1)
-		// Turn right
-		dir = turn_xz(olddir, 0);
-	else
-		// Turn left
-		dir = turn_xz(olddir, 1);
-	return dir;
-}
-
-
-int dir_to_facedir(v3s16 d)
-{
-	if (abs(d.X) > abs(d.Z))
-		return d.X < 0 ? 3 : 1;
-
-	return d.Z < 0 ? 2 : 0;
-}