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// HeiGen.h
/*
Interfaces to the various height-based terrain shape generators:
- cHeiGenFlat
- cHeiGenClassic
- cHeiGenBiomal
Also implements the heightmap cache
*/
#pragma once
#include "ComposableGenerator.h"
#include "../Noise/Noise.h"
/** A simple cache that stores N most recently generated chunks' heightmaps; N being settable upon creation */
class cHeiGenCache :
public cTerrainHeightGen
{
public:
cHeiGenCache(cTerrainHeightGenPtr a_HeiGenToCache, size_t a_CacheSize);
~cHeiGenCache();
// cTerrainHeightGen overrides:
virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
virtual HEIGHTTYPE GetHeightAt(int a_BlockX, int a_BlockZ) 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:
struct sCacheData
{
int m_ChunkX;
int m_ChunkZ;
cChunkDef::HeightMap m_HeightMap;
} ;
/** The terrain height generator that is being cached. */
cTerrainHeightGenPtr m_HeiGenToCache;
// To avoid moving large amounts of data for the MRU behavior, we MRU-ize indices to an array of the actual data
size_t m_CacheSize;
size_t * 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
size_t m_NumHits;
size_t m_NumMisses;
size_t m_TotalChain; // Number of cache items walked to get to a hit (only added for hits)
} ;
/** Caches heightmaps in multiple underlying caches to improve the distribution and lower the chain length. */
class cHeiGenMultiCache:
public cTerrainHeightGen
{
public:
cHeiGenMultiCache(cTerrainHeightGenPtr a_HeightGenToCache, size_t a_SubCacheSize, size_t a_NumSubCaches);
// cTerrainHeightGen overrides:
virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
virtual HEIGHTTYPE GetHeightAt(int a_BlockX, int a_BlockZ) 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:
typedef SharedPtr<cHeiGenCache> cHeiGenCachePtr;
typedef std::vector<cHeiGenCachePtr> cHeiGenCachePtrs;
/** The coefficient used to turn Z coords into index (x + Coeff * z). */
static const size_t m_CoeffZ = 5;
/** Number of sub-caches, pulled out of m_SubCaches.size() for performance reasons. */
size_t m_NumSubCaches;
/** The individual sub-caches. */
cHeiGenCachePtrs m_SubCaches;
};
class cHeiGenFlat :
public cTerrainHeightGen
{
public:
cHeiGenFlat(void) : m_Height(5) {}
protected:
HEIGHTTYPE 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;
} ;
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 cHeiGenMountains :
public cTerrainHeightGen
{
public:
cHeiGenMountains(int a_Seed);
protected:
int m_Seed;
cRidgedMultiNoise m_MountainNoise;
cRidgedMultiNoise m_DitchNoise;
cPerlinNoise m_Perlin;
// 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
{
typedef cTerrainHeightGen Super;
public:
cHeiGenBiomal(int a_Seed, cBiomeGenPtr a_BiomeGen) :
m_Noise(a_Seed),
m_BiomeGen(a_BiomeGen)
{
}
// cTerrainHeightGen overrides:
virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
virtual HEIGHTTYPE GetHeightAt(int a_BlockX, int a_BlockZ) override // Need to provide this override due to clang's overzealous detection of overloaded virtuals
{
return Super::GetHeightAt(a_BlockX, a_BlockZ);
}
virtual void InitializeHeightGen(cIniFile & a_IniFile) override;
protected:
typedef cChunkDef::BiomeMap BiomeNeighbors[3][3];
cNoise m_Noise;
cBiomeGenPtr 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];
NOISE_DATATYPE GetHeightAt(int a_RelX, int a_RelZ, int a_ChunkX, int a_ChunkZ, const BiomeNeighbors & a_BiomeNeighbors);
} ;
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