Mapgen: Add 4D fractal mapgen

src/mapgen_fractal.h

@@ -0,0 +1,133 @@
+/*
+Minetest
+Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+Additional development and fractal code by 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.
+*/
+
+#ifndef MAPGEN_FRACTAL_HEADER
+#define MAPGEN_FRACTAL_HEADER
+
+#include "mapgen.h"
+
+/////////////////// Mapgen Fractal flags
+#define MGFRACTAL_JULIA 0x01
+
+class BiomeManager;
+
+extern FlagDesc flagdesc_mapgen_fractal[];
+
+
+struct MapgenFractalParams : public MapgenSpecificParams {
+	u32 spflags;
+
+	u16 iterations;
+	float scale_x;
+	float scale_y;
+	float scale_z;
+	float offset_x;
+	float offset_y;
+	float offset_z;
+	float slice_w;
+	float julia_x;
+	float julia_y;
+	float julia_z;
+	float julia_w;
+
+	NoiseParams np_cave1;
+	NoiseParams np_cave2;
+
+	MapgenFractalParams();
+	~MapgenFractalParams() {}
+
+	void readParams(const Settings *settings);
+	void writeParams(Settings *settings) const;
+};
+
+class MapgenFractal : public Mapgen {
+public:
+	EmergeManager *m_emerge;
+	BiomeManager *bmgr;
+
+	int ystride;
+	int zstride;
+	u32 spflags;
+
+	v3s16 node_min;
+	v3s16 node_max;
+	v3s16 full_node_min;
+	v3s16 full_node_max;
+
+	u16 iterations;
+	float scale_x;
+	float scale_y;
+	float scale_z;
+	float offset_x;
+	float offset_y;
+	float offset_z;
+	float slice_w;
+	float julia_x;
+	float julia_y;
+	float julia_z;
+	float julia_w;
+
+	Noise *noise_cave1;
+	Noise *noise_cave2;
+
+	Noise *noise_heat;
+	Noise *noise_humidity;
+	Noise *noise_heat_blend;
+	Noise *noise_humidity_blend;
+
+	content_t c_stone;
+	content_t c_water_source;
+	content_t c_lava_source;
+	content_t c_desert_stone;
+	content_t c_ice;
+	content_t c_sandstone;
+
+	content_t c_cobble;
+	content_t c_stair_cobble;
+	content_t c_mossycobble;
+	content_t c_sandstonebrick;
+	content_t c_stair_sandstonebrick;
+
+	MapgenFractal(int mapgenid, MapgenParams *params, EmergeManager *emerge);
+	~MapgenFractal();
+
+	virtual void makeChunk(BlockMakeData *data);
+	int getGroundLevelAtPoint(v2s16 p);
+	void calculateNoise();
+	bool getTerrainAtPoint(s16 x, s16 y, s16 z);
+	s16 generateTerrain();
+	MgStoneType generateBiomes(float *heat_map, float *humidity_map);
+	void dustTopNodes();
+	void generateCaves(s16 max_stone_y);
+};
+
+struct MapgenFactoryFractal : public MapgenFactory {
+	Mapgen *createMapgen(int mgid, MapgenParams *params, EmergeManager *emerge)
+	{
+		return new MapgenFractal(mgid, params, emerge);
+	};
+
+	MapgenSpecificParams *createMapgenParams()
+	{
+		return new MapgenFractalParams();
+	};
+};
+
+#endif