1 files changed, 241 insertions, 0 deletions
diff --git a/src/Generating/BioGen.h b/src/Generating/BioGen.h
new file mode 100644
index 000000000..892168bb6
--- /dev/null
+++ b/src/Generating/BioGen.h
@@ -0,0 +1,241 @@
+
+// BioGen.h
+
+/*
+Interfaces to the various biome generators:
+	- cBioGenConstant
+	- cBioGenCheckerboard
+	- cBioGenDistortedVoronoi
+*/
+
+
+
+
+
+#pragma once
+
+#include "ComposableGenerator.h"
+#include "../Noise.h"
+#include "../VoronoiMap.h"
+
+
+
+
+
+class cBioGenConstant :
+	public cBiomeGen
+{
+public:
+	cBioGenConstant(void) : m_Biome(biPlains) {}
+	
+protected:
+
+	EMCSBiome m_Biome;
+
+	// cBiomeGen overrides:
+	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
+	virtual void InitializeBiomeGen(cIniFile & a_IniFile) override;
+} ;
+
+
+
+
+
+/// A simple cache that stores N most recently generated chunks' biomes; N being settable upon creation
+class cBioGenCache :
+	public cBiomeGen
+{
+	typedef cBiomeGen super;
+	
+public:
+	cBioGenCache(cBiomeGen * a_BioGenToCache, int a_CacheSize);  // Doesn't take ownership of a_BioGenToCache
+	~cBioGenCache();
+	
+protected:
+
+	cBiomeGen * m_BioGenToCache;
+	
+	struct sCacheData
+	{
+		int m_ChunkX;
+		int m_ChunkZ;
+		cChunkDef::BiomeMap m_BiomeMap;
+	} ;
+	
+	// To avoid moving large amounts of data for the MRU behavior, we MRU-ize indices to an array of the actual data
+	int          m_CacheSize;
+	int *        m_CacheOrder;  // MRU-ized order, indices into m_CacheData array
+	sCacheData * m_CacheData;   // m_CacheData[m_CacheOrder[0]] is the most recently used
+	
+	// Cache statistics
+	int m_NumHits;
+	int m_NumMisses;
+	int m_TotalChain;  // Number of cache items walked to get to a hit (only added for hits)
+	
+	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
+	virtual void InitializeBiomeGen(cIniFile & a_IniFile) override;
+} ;
+
+
+
+
+
+/// Base class for generators that use a list of available biomes. This class takes care of the list.
+class cBiomeGenList :
+	public cBiomeGen
+{
+	typedef cBiomeGen super;
+	
+protected:
+	// List of biomes that the generator is allowed to generate:
+	typedef std::vector<EMCSBiome> EMCSBiomes;
+	EMCSBiomes m_Biomes;
+	int        m_BiomesCount;  // Pulled out of m_Biomes for faster access
+	
+	/// Parses the INI file setting string into m_Biomes.
+	void InitializeBiomes(const AString & a_Biomes);
+} ;
+
+
+
+
+
+class cBioGenCheckerboard :
+	public cBiomeGenList
+{
+	typedef cBiomeGenList super;
+	
+protected:
+	int m_BiomeSize;
+	
+	// cBiomeGen overrides:
+	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
+	virtual void InitializeBiomeGen(cIniFile & a_IniFile) override;
+} ;
+
+
+
+
+
+class cBioGenVoronoi :
+	public cBiomeGenList
+{
+	typedef cBiomeGenList super;
+	
+public:
+	cBioGenVoronoi(int a_Seed) :
+		m_Voronoi(a_Seed)
+	{
+	}
+	
+protected:
+	cVoronoiMap m_Voronoi;
+	
+	// cBiomeGen overrides:
+	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
+	virtual void InitializeBiomeGen(cIniFile & a_IniFile) override;
+	
+	EMCSBiome VoronoiBiome(int a_BlockX, int a_BlockZ);
+} ;
+
+
+
+
+
+class cBioGenDistortedVoronoi :
+	public cBiomeGenList
+{
+	typedef cBiomeGenList super;
+	
+public:
+	cBioGenDistortedVoronoi(int a_Seed) :
+		m_Noise(a_Seed),
+		m_Voronoi(a_Seed),
+		m_CellSize(0)
+	{
+	}
+
+protected:
+	/// Noise used for the distortion
+	cNoise m_Noise;
+	
+	/// The underlying Voronoi map of the biomes
+	cVoronoiMap m_Voronoi;
+	
+	/// Size of the Voronoi cells, also used for distortion amplitude
+	int m_CellSize;
+	
+	// cBiomeGen overrides:
+	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
+	virtual void InitializeBiomeGen(cIniFile & a_IniFile) override;
+	
+	/// Distorts the coords using a Perlin-like noise
+	void Distort(int a_BlockX, int a_BlockZ, int & a_DistortedX, int & a_DistortedZ);
+} ;
+
+
+
+
+
+class cBioGenMultiStepMap :
+	public cBiomeGen
+{
+	typedef cBiomeGen super;
+	
+public:
+	cBioGenMultiStepMap(int a_Seed);
+	
+protected:
+	// Noises used for composing the perlin-noise:
+	cNoise m_Noise1;
+	cNoise m_Noise2;
+	cNoise m_Noise3;
+	cNoise m_Noise4;
+	cNoise m_Noise5;
+	cNoise m_Noise6;
+	
+	int    m_Seed;
+	int    m_OceanCellSize;
+	int    m_MushroomIslandSize;
+	int    m_RiverCellSize;
+	double m_RiverWidthThreshold;
+	float  m_LandBiomesSize;
+	
+	typedef int    IntMap[17 * 17];  // x + 17 * z, expected trimmed into [0..255] range
+	typedef double DblMap[17 * 17];  // x + 17 * z, expected trimmed into [0..1] range
+		
+	// cBiomeGen overrides:
+	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
+	virtual void InitializeBiomeGen(cIniFile & a_IniFile) override;
+	
+	/** Step 1: Decides between ocean, land and mushroom, using a DistVoronoi with special conditions and post-processing for mushroom islands
+	Sets biomes to biOcean, -1 (i.e. land), biMushroomIsland or biMushroomShore
+	*/
+	void DecideOceanLandMushroom(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap);
+	
+	/** Step 2: Add rivers to the land
+	Flips some "-1" biomes into biRiver
+	*/
+	void AddRivers(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap);
+	
+	/** Step 3: Decide land biomes using a temperature / humidity map; freeze ocean / river in low temperatures.
+	Flips all remaining "-1" biomes into land biomes. Also flips some biOcean and biRiver into biFrozenOcean, biFrozenRiver, based on temp map.
+	*/
+	void ApplyTemperatureHumidity(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap);
+	
+	/// Distorts the coords using a Perlin-like noise, with a specified cell-size
+	void Distort(int a_BlockX, int a_BlockZ, int & a_DistortedX, int & a_DistortedZ, int a_CellSize);
+	
+	/// Builds two Perlin-noise maps, one for temperature, the other for humidity. Trims both into [0..255] range
+	void BuildTemperatureHumidityMaps(int a_ChunkX, int a_ChunkZ, IntMap & a_TemperatureMap, IntMap & a_HumidityMap);
+	
+	/// Flips all remaining "-1" biomes into land biomes using the two maps
+	void DecideLandBiomes(cChunkDef::BiomeMap & a_BiomeMap, const IntMap & a_TemperatureMap, const IntMap & a_HumidityMap);
+	
+	/// Flips biOcean and biRiver into biFrozenOcean and biFrozenRiver if the temperature is too low
+	void FreezeWaterBiomes(cChunkDef::BiomeMap & a_BiomeMap, const IntMap & a_TemperatureMap);
+} ;
+
+
+
+