1 files changed, 145 insertions, 0 deletions
diff --git a/src/Generating/HeiGen.h b/src/Generating/HeiGen.h
new file mode 100644
index 000000000..1376f2a25
--- /dev/null
+++ b/src/Generating/HeiGen.h
@@ -0,0 +1,145 @@
+
+// HeiGen.h
+
+/*
+Interfaces to the various height generators:
+	- cHeiGenFlat
+	- cHeiGenClassic
+	- cHeiGenBiomal
+*/
+
+
+
+
+
+#pragma once
+
+#include "ComposableGenerator.h"
+#include "../Noise.h"
+
+
+
+
+
+class cHeiGenFlat :
+	public cTerrainHeightGen
+{
+public:
+	cHeiGenFlat(void) : m_Height(5) {}
+	
+protected:
+
+	int m_Height;
+
+	// cTerrainHeightGen overrides:
+	virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
+	virtual void InitializeHeightGen(cIniFile & a_IniFile) override;
+} ;
+
+
+
+
+
+/// A simple cache that stores N most recently generated chunks' heightmaps; N being settable upon creation
+class cHeiGenCache :
+	public cTerrainHeightGen
+{
+public:
+	cHeiGenCache(cTerrainHeightGen & a_HeiGenToCache, int a_CacheSize);  // Doesn't take ownership of a_HeiGenToCache
+	~cHeiGenCache();
+	
+	// cTerrainHeightGen overrides:
+	virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
+	virtual void InitializeHeightGen(cIniFile & a_IniFile) override;
+	
+	/// Retrieves height at the specified point in the cache, returns true if found, false if not found
+	bool GetHeightAt(int a_ChunkX, int a_ChunkZ, int a_RelX, int a_RelZ, HEIGHTTYPE & a_Height);
+	
+protected:
+
+	cTerrainHeightGen & m_HeiGenToCache;
+	
+	struct sCacheData
+	{
+		int m_ChunkX;
+		int m_ChunkZ;
+		cChunkDef::HeightMap m_HeightMap;
+	} ;
+	
+	// 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)
+} ;
+
+
+
+
+
+class cHeiGenClassic :
+	public cTerrainHeightGen
+{
+public:
+	cHeiGenClassic(int a_Seed);
+	
+protected:
+
+	int m_Seed;
+	cNoise m_Noise;
+	float m_HeightFreq1, m_HeightAmp1;
+	float m_HeightFreq2, m_HeightAmp2;
+	float m_HeightFreq3, m_HeightAmp3;
+	
+	float GetNoise(float x, float y);
+
+	// cTerrainHeightGen overrides:
+	virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
+	virtual void InitializeHeightGen(cIniFile & a_IniFile) override;
+} ;
+
+
+
+
+
+class cHeiGenBiomal :
+	public cTerrainHeightGen
+{
+public:
+	cHeiGenBiomal(int a_Seed, cBiomeGen & a_BiomeGen) :
+		m_Noise(a_Seed),
+		m_BiomeGen(a_BiomeGen)
+	{
+	}
+	
+protected:
+
+	typedef cChunkDef::BiomeMap BiomeNeighbors[3][3];
+
+	cNoise      m_Noise;
+	cBiomeGen & m_BiomeGen;
+	
+	// Per-biome terrain generator parameters:
+	struct sGenParam
+	{
+		float m_HeightFreq1, m_HeightAmp1;
+		float m_HeightFreq2, m_HeightAmp2;
+		float m_HeightFreq3, m_HeightAmp3;
+		float m_BaseHeight;
+	} ;
+	static const sGenParam m_GenParam[256];
+	
+	// cTerrainHeightGen overrides:
+	virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
+	virtual void InitializeHeightGen(cIniFile & a_IniFile) override;
+	
+	NOISE_DATATYPE GetHeightAt(int a_RelX, int a_RelZ, int a_ChunkX, int a_ChunkZ, const BiomeNeighbors & a_BiomeNeighbors);
+} ;
+
+
+
+