mapgen_fractal.h

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/*
Minetest
Copyright (C) 2015-2019 paramat
Copyright (C) 2015-2016 kwolekr, Ryan Kwolek
 
Fractal formulas from http://www.bugman123.com/Hypercomplex/index.html
by Paul Nylander, and from http://www.fractalforums.com, thank you.
 
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 "mapgen.h"
 
#define MGFRACTAL_TERRAIN     0x01
 
class BiomeManager;
 
extern FlagDesc flagdesc_mapgen_fractal[];
 
 
struct MapgenFractalParams : public MapgenParams
{
    float cave_width = 0.09f;
    s16 large_cave_depth = -33;
    u16 small_cave_num_min = 0;
    u16 small_cave_num_max = 0;
    u16 large_cave_num_min = 0;
    u16 large_cave_num_max = 2;
    float large_cave_flooded = 0.5f;
    s16 dungeon_ymin = -31000;
    s16 dungeon_ymax = 31000;
    u16 fractal = 1;
    u16 iterations = 11;
    v3f scale = v3f(4096.0, 1024.0, 4096.0);
    v3f offset = v3f(1.52, 0.0, 0.0);
    float slice_w = 0.0f;
    float julia_x = 0.267f;
    float julia_y = 0.2f;
    float julia_z = 0.133f;
    float julia_w = 0.067f;
 
    NoiseParams np_seabed;
    NoiseParams np_filler_depth;
    NoiseParams np_cave1;
    NoiseParams np_cave2;
    NoiseParams np_dungeons;
 
    MapgenFractalParams();
    ~MapgenFractalParams() = default;
 
    void readParams(const Settings *settings);
    void writeParams(Settings *settings) const;
    void setDefaultSettings(Settings *settings);
};
 
 
class MapgenFractal : public MapgenBasic
{
public:
    MapgenFractal(MapgenFractalParams *params, EmergeParams *emerge);
    ~MapgenFractal();
 
    virtual MapgenType getType() const { return MAPGEN_FRACTAL; }
 
    virtual void makeChunk(BlockMakeData *data);
    int getSpawnLevelAtPoint(v2s16 p);
    bool getFractalAtPoint(s16 x, s16 y, s16 z);
    s16 generateTerrain();
 
private:
    u16 formula;
    bool julia;
    u16 fractal;
    u16 iterations;
    v3f scale;
    v3f offset;
    float slice_w;
    float julia_x;
    float julia_y;
    float julia_z;
    float julia_w;
    Noise *noise_seabed = nullptr;
};