169 lines
3.5 KiB
C++
169 lines
3.5 KiB
C++
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// HeiGen.h
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/*
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Interfaces to the various height-based terrain shape generators:
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- cHeiGenFlat
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- cHeiGenClassic
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- cHeiGenBiomal
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Also implements the heightmap cache
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*/
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#pragma once
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#include "ComposableGenerator.h"
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#include "../Noise.h"
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/** A simple cache that stores N most recently generated chunks' heightmaps; N being settable upon creation */
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class cHeiGenCache :
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public cTerrainHeightGen
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{
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public:
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cHeiGenCache(cTerrainHeightGenPtr a_HeiGenToCache, int a_CacheSize);
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~cHeiGenCache();
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// cTerrainHeightGen overrides:
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virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
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/** Retrieves height at the specified point in the cache, returns true if found, false if not found */
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bool GetHeightAt(int a_ChunkX, int a_ChunkZ, int a_RelX, int a_RelZ, HEIGHTTYPE & a_Height);
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protected:
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struct sCacheData
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{
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int m_ChunkX;
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int m_ChunkZ;
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cChunkDef::HeightMap m_HeightMap;
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} ;
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/** The terrain height generator that is being cached. */
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cTerrainHeightGenPtr m_HeiGenToCache;
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// To avoid moving large amounts of data for the MRU behavior, we MRU-ize indices to an array of the actual data
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int m_CacheSize;
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int * m_CacheOrder; // MRU-ized order, indices into m_CacheData array
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sCacheData * m_CacheData; // m_CacheData[m_CacheOrder[0]] is the most recently used
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// Cache statistics
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int m_NumHits;
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int m_NumMisses;
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int m_TotalChain; // Number of cache items walked to get to a hit (only added for hits)
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} ;
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class cHeiGenFlat :
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public cTerrainHeightGen
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{
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public:
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cHeiGenFlat(void) : m_Height(5) {}
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protected:
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int m_Height;
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// cTerrainHeightGen overrides:
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virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
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virtual void InitializeHeightGen(cIniFile & a_IniFile) override;
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} ;
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class cHeiGenClassic :
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public cTerrainHeightGen
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{
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public:
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cHeiGenClassic(int a_Seed);
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protected:
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int m_Seed;
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cNoise m_Noise;
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float m_HeightFreq1, m_HeightAmp1;
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float m_HeightFreq2, m_HeightAmp2;
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float m_HeightFreq3, m_HeightAmp3;
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float GetNoise(float x, float y);
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// cTerrainHeightGen overrides:
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virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
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virtual void InitializeHeightGen(cIniFile & a_IniFile) override;
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} ;
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class cHeiGenMountains :
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public cTerrainHeightGen
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{
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public:
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cHeiGenMountains(int a_Seed);
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protected:
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int m_Seed;
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cRidgedMultiNoise m_MountainNoise;
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cRidgedMultiNoise m_DitchNoise;
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cPerlinNoise m_Perlin;
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// cTerrainHeightGen overrides:
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virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
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virtual void InitializeHeightGen(cIniFile & a_IniFile) override;
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} ;
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class cHeiGenBiomal :
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public cTerrainHeightGen
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{
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public:
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cHeiGenBiomal(int a_Seed, cBiomeGenPtr a_BiomeGen) :
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m_Noise(a_Seed),
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m_BiomeGen(a_BiomeGen)
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{
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}
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protected:
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typedef cChunkDef::BiomeMap BiomeNeighbors[3][3];
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cNoise m_Noise;
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cBiomeGenPtr m_BiomeGen;
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// Per-biome terrain generator parameters:
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struct sGenParam
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{
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float m_HeightFreq1, m_HeightAmp1;
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float m_HeightFreq2, m_HeightAmp2;
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float m_HeightFreq3, m_HeightAmp3;
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float m_BaseHeight;
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} ;
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static const sGenParam m_GenParam[256];
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// cTerrainHeightGen overrides:
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virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
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virtual void InitializeHeightGen(cIniFile & a_IniFile) override;
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NOISE_DATATYPE GetHeightAt(int a_RelX, int a_RelZ, int a_ChunkX, int a_ChunkZ, const BiomeNeighbors & a_BiomeNeighbors);
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} ;
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