1 files changed, 171 insertions, 0 deletions

diff --git a/source/Generating/BioGen.h b/source/Generating/BioGen.h
new file mode 100644
index 000000000..6cd78b7e0
--- /dev/null
+++ b/source/Generating/BioGen.h
@@ -0,0 +1,171 @@
+
+// BioGen.h
+
+/*
+Interfaces to the various biome generators:
+	- cBioGenConstant
+	- cBioGenCheckerboard
+	- cBioGenDistortedVoronoi
+*/
+
+
+
+
+
+#pragma once
+
+#include "ChunkGenerator.h"
+#include "../cNoise.h"
+
+
+
+
+
+class cBioGenConstant :
+	public cBiomeGen
+{
+public:
+	cBioGenConstant(EMCSBiome a_Biome) : m_Biome(a_Biome) {}
+	
+protected:
+
+	EMCSBiome m_Biome;
+
+	// cBiomeGen override:
+	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
+} ;
+
+
+
+
+
+/// A simple cache that stores N most recently generated chunks' biomes; N being settable upon creation
+class cBioGenCache :
+	public cBiomeGen
+{
+public:
+	cBioGenCache(cBiomeGen * a_BioGenToCache, int a_CacheSize);  // Takes 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;
+} ;
+
+
+
+
+
+/// Base class for generators that use a list of available biomes. This class takes care of the list.
+class cBiomeGenList :
+	public cBiomeGen
+{
+protected:
+	cBiomeGenList(const AString & a_Biomes)
+	{
+		InitializeBiomes(a_Biomes);
+	}
+	
+	// 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
+	
+	void InitializeBiomes(const AString & a_Biomes);
+	
+} ;
+
+
+
+
+
+class cBioGenCheckerboard :
+	public cBiomeGenList
+{
+public:
+	cBioGenCheckerboard(int a_BiomeSize, const AString & a_Biomes) :
+		cBiomeGenList(a_Biomes),
+		m_BiomeSize((a_BiomeSize < 8) ? 8 : a_BiomeSize)
+	{
+	}
+	
+protected:
+
+	int m_BiomeSize;
+	
+	// cBiomeGen override:
+	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
+} ;
+
+
+
+
+
+class cBioGenVoronoi :
+	public cBiomeGenList
+{
+public:
+	cBioGenVoronoi(int a_Seed, int a_CellSize, const AString & a_Biomes) :
+		cBiomeGenList(a_Biomes),
+		m_CellSize((a_CellSize > 4) ? a_CellSize : 4),
+		m_Noise(a_Seed)
+	{
+	}
+	
+protected:
+
+	int m_CellSize;
+	
+	cNoise m_Noise;
+
+	// cBiomeGen override:
+	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
+	
+	EMCSBiome VoronoiBiome(int a_BlockX, int a_BlockZ);
+} ;
+
+
+
+
+
+class cBioGenDistortedVoronoi :
+	public cBioGenVoronoi
+{
+public:
+	cBioGenDistortedVoronoi(int a_Seed, int a_CellSize, const AString & a_Biomes) :
+		cBioGenVoronoi(a_Seed, a_CellSize, a_Biomes)
+	{
+	}
+
+protected:
+
+	// cBiomeGen override:
+	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
+	
+	/// Distorts the coords using a Perlin-like noise
+	void Distort(int a_BlockX, int a_BlockZ, int & a_DistortedX, int & a_DistortedZ);
+} ;
+
+
+
+
+