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diff --git a/source/Generating/HeiGen.h b/source/Generating/HeiGen.h
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+
+// HeiGen.h
+
+/*
+Interfaces to the various height generators:
+ - cHeiGenFlat
+ - cHeiGenClassic
+ - cHeiGenBiomal
+*/
+
+
+
+
+
+#pragma once
+
+#include "ChunkGenerator.h"
+#include "../cNoise.h"
+
+
+
+
+
+class cHeiGenFlat :
+ public cTerrainHeightGen
+{
+public:
+ cHeiGenFlat(int a_Height) : m_Height(a_Height) {}
+
+protected:
+
+ int m_Height;
+
+ // cTerrainHeightGen override:
+ virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) 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); // Takes ownership of a_HeiGenToCache
+ ~cHeiGenCache();
+
+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)
+
+ virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
+} ;
+
+
+
+
+
+class cHeiGenClassic :
+ public cTerrainHeightGen
+{
+public:
+ cHeiGenClassic(int a_Seed, float a_HeightFreq1, float a_HeightAmp1, float a_HeightFreq2, float a_HeightAmp2, float a_HeightFreq3, float a_HeightAmp3);
+
+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 override:
+ virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) 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[biNumBiomes];
+
+ // cTerrainHeightGen override:
+ virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
+
+ HEIGHTTYPE GetHeightAt(int a_RelX, int a_RelZ, int a_ChunkX, int a_ChunkZ, const BiomeNeighbors & a_BiomeNeighbors);
+} ;
+
+
+
+