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// 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(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); // Doesn't take ownership of a_HeiGenToCache
~cHeiGenCache();
// cTerrainHeightGen override:
virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
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, 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;
NOISE_DATATYPE GetHeightAt(int a_RelX, int a_RelZ, int a_ChunkX, int a_ChunkZ, const BiomeNeighbors & a_BiomeNeighbors);
} ;
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