dungeongen.h

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/*
Minetest
Copyright (C) 2010-2018 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2015-2018 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.
*/
 
#pragma once
 
#include "voxel.h"
#include "noise.h"
#include "mapgen.h"
 
#define VMANIP_FLAG_DUNGEON_INSIDE VOXELFLAG_CHECKED1
#define VMANIP_FLAG_DUNGEON_PRESERVE VOXELFLAG_CHECKED2
#define VMANIP_FLAG_DUNGEON_UNTOUCHABLE (\
        VMANIP_FLAG_DUNGEON_INSIDE|VMANIP_FLAG_DUNGEON_PRESERVE)
 
class MMVManip;
class NodeDefManager;
 
v3s16 rand_ortho_dir(PseudoRandom &random, bool diagonal_dirs);
v3s16 turn_xz(v3s16 olddir, int t);
void random_turn(PseudoRandom &random, v3s16 &dir);
int dir_to_facedir(v3s16 d);
 
 
struct DungeonParams {
    s32 seed;
 
    content_t c_wall;
    // Randomly scattered alternative wall nodes
    content_t c_alt_wall;
    content_t c_stair;
 
    // 3D noise that determines which c_wall nodes are converted to c_alt_wall
    NoiseParams np_alt_wall;
 
    // Number of dungeons generated in mapchunk. All will use the same set of
    // dungeonparams.
    u16 num_dungeons;
    // Dungeons only generate in ground
    bool only_in_ground;
    // Number of rooms
    u16 num_rooms;
    // Room size random range. Includes walls / floor / ceilng
    v3s16 room_size_min;
    v3s16 room_size_max;
    // Large room size random range. Includes walls / floor / ceilng
    v3s16 room_size_large_min;
    v3s16 room_size_large_max;
    // Value 0 disables large rooms.
    // Value 1 results in 1 large room, the first generated room.
    // Value > 1 makes the first generated room large, all other rooms have a
    // '1 in value' chance of being large.
    u16 large_room_chance;
    // Dimensions of 3D 'brush' that creates corridors.
    // Dimensions are of the empty space, not including walls / floor / ceilng.
    // Diagonal corridors must have hole width >=2 to be passable.
    // Currently, hole width >= 3 causes stair corridor bugs.
    v3s16 holesize;
    // Corridor length random range
    u16 corridor_len_min;
    u16 corridor_len_max;
    // Diagonal corridors are possible, 1 in 4 corridors will be diagonal
    bool diagonal_dirs;
    // Usually 'GENNOTIFY_DUNGEON', but mapgen v6 uses 'GENNOTIFY_TEMPLE' for
    // desert dungeons.
    GenNotifyType notifytype;
};
 
class DungeonGen {
public:
    MMVManip *vm = nullptr;
    const NodeDefManager *ndef;
    GenerateNotifier *gennotify;
 
    u32 blockseed;
    PseudoRandom random;
    v3s16 csize;
 
    content_t c_torch;
    DungeonParams dp;
 
    // RoomWalker
    v3s16 m_pos;
    v3s16 m_dir;
 
    DungeonGen(const NodeDefManager *ndef,
        GenerateNotifier *gennotify, DungeonParams *dparams);
 
    void generate(MMVManip *vm, u32 bseed, v3s16 full_node_min, v3s16 full_node_max);
 
    void makeDungeon(v3s16 start_padding);
    void makeRoom(v3s16 roomsize, v3s16 roomplace);
    void makeCorridor(v3s16 doorplace, v3s16 doordir,
        v3s16 &result_place, v3s16 &result_dir);
    void makeDoor(v3s16 doorplace, v3s16 doordir);
    void makeFill(v3s16 place, v3s16 size, u8 avoid_flags, MapNode n, u8 or_flags);
    void makeHole(v3s16 place);
 
    bool findPlaceForDoor(v3s16 &result_place, v3s16 &result_dir);
    bool findPlaceForRoomDoor(v3s16 roomsize, v3s16 &result_doorplace,
            v3s16 &result_doordir, v3s16 &result_roomplace);
 
    inline void randomizeDir()
    {
        m_dir = rand_ortho_dir(random, dp.diagonal_dirs);
    }
};
 
extern NoiseParams nparams_dungeon_density;
extern NoiseParams nparams_dungeon_alt_wall;