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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"
+
+///////////// Mapgen Fractal flags
+#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;
+};