minetest/src/mapgen_valleys.h

/*
Minetest Valleys C
Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
Copyright (C) 2010-2015 paramat, Matt Gregory
Copyright (C) 2016 Duane Robertson <duane@duanerobertson.com>

Based on Valleys Mapgen by Gael de Sailly
 (https://forum.minetest.net/viewtopic.php?f=9&t=11430)
and mapgen_v7 by kwolekr and paramat.

Licensing changed by permission of Gael de Sailly.

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_VALLEYS_HEADER
#define MAPGEN_VALLEYS_HEADER

#include "mapgen.h"

////////////// Mapgen Valleys flags
#define MGVALLEYS_ALT_CHILL    0x01
#define MGVALLEYS_HUMID_RIVERS 0x02

// Feed only one variable into these.
#define MYSQUARE(x) (x) * (x)
#define MYCUBE(x) (x) * (x) * (x)

class BiomeManager;

// Global profiler
//class Profiler;
//extern Profiler *mapgen_profiler;


struct MapgenValleysParams : public MapgenSpecificParams {
	u32 spflags;

	s16 large_cave_depth;
	s16 massive_cave_depth;
	u16 altitude_chill;
	u16 lava_features;
	u16 river_depth;
	u16 river_size;
	u16 water_features;

	NoiseParams np_biome_heat;
	NoiseParams np_biome_heat_blend;
	NoiseParams np_biome_humidity;
	NoiseParams np_biome_humidity_blend;
	NoiseParams np_cave1;
	NoiseParams np_cave2;
	NoiseParams np_filler_depth;
	NoiseParams np_inter_valley_fill;
	NoiseParams np_inter_valley_slope;
	NoiseParams np_rivers;
	NoiseParams np_massive_caves;
	NoiseParams np_terrain_height;
	NoiseParams np_valley_depth;
	NoiseParams np_valley_profile;

	MapgenValleysParams();
	~MapgenValleysParams() {}

	void readParams(const Settings *settings);
	void writeParams(Settings *settings) const;
};

struct TerrainNoise {
	s16 x;
	s16 z;
	float terrain_height;
	float *rivers;
	float *valley;
	float valley_profile;
	float *slope;
	float inter_valley_fill;
};

class MapgenValleys : public Mapgen {
public:

	MapgenValleys(int mapgenid, MapgenParams *params, EmergeManager *emerge);
	~MapgenValleys();

	virtual void makeChunk(BlockMakeData *data);
	int getSpawnLevelAtPoint(v2s16 p);

	s16 large_cave_depth;

private:
	EmergeManager *m_emerge;
	BiomeManager *bmgr;

	int ystride;
	int zstride;
	int zstride_1d;

	float map_gen_limit;

	u32 spflags;
	bool humid_rivers;
	bool use_altitude_chill;

	v3s16 node_min;
	v3s16 node_max;
	v3s16 full_node_min;
	v3s16 full_node_max;

	Noise *noise_filler_depth;

	Noise *noise_cave1;
	Noise *noise_cave2;
	Noise *noise_heat;
	Noise *noise_heat_blend;
	Noise *noise_humidity;
	Noise *noise_humidity_blend;
	Noise *noise_inter_valley_fill;
	Noise *noise_inter_valley_slope;
	Noise *noise_rivers;
	Noise *noise_massive_caves;
	Noise *noise_terrain_height;
	Noise *noise_valley_depth;
	Noise *noise_valley_profile;

	float altitude_chill;
	s16 cave_water_max_height;
	float humidity_adjust;
	s16 lava_features_lim;
	s16 lava_max_height;
	s16 massive_cave_depth;
	float river_depth_bed;
	float river_size_factor;
	float *tcave_cache;
	s16 water_features_lim;

	content_t c_cobble;
	content_t c_desert_stone;
	content_t c_dirt;
	content_t c_ice;
	content_t c_lava_source;
	content_t c_mossycobble;
	content_t c_river_water_source;
	content_t c_sand;
	content_t c_sandstone;
	content_t c_sandstonebrick;
	content_t c_stair_cobble;
	content_t c_stair_sandstonebrick;
	content_t c_stone;
	content_t c_water_source;

	float terrainLevelAtPoint(s16 x, s16 z);

	void calculateNoise();

	virtual int generateTerrain();
	float terrainLevelFromNoise(TerrainNoise *tn);
	float adjustedTerrainLevelFromNoise(TerrainNoise *tn);

	float humidityByTerrain(float humidity_base, float mount, float rivers, float valley);

	MgStoneType generateBiomes(float *heat_map, float *humidity_map);
	void dustTopNodes();

	void generateCaves(s16 max_stone_y);
};

struct MapgenFactoryValleys : public MapgenFactory {
	Mapgen *createMapgen(int mgid, MapgenParams *params, EmergeManager *emerge)
	{
		return new MapgenValleys(mgid, params, emerge);
	};

	MapgenSpecificParams *createMapgenParams()
	{
		return new MapgenValleysParams();
	};
};

#endif