141 lines
4.7 KiB
C++
141 lines
4.7 KiB
C++
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// DistortedHeightmap.h
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// Declares the cDistortedHeightmap class representing the height and composition generator capable of overhangs
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#pragma once
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#include "ComposableGenerator.h"
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#include "HeiGen.h"
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#define NOISE_SIZE_Y (257 + 32)
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class cDistortedHeightmap :
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public cTerrainHeightGen,
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public cTerrainCompositionGen
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{
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public:
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/// Structure used for storing block patterns for columns
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struct sBlockInfo
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{
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BLOCKTYPE BlockType;
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NIBBLETYPE BlockMeta;
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} ;
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cDistortedHeightmap(int a_Seed, cBiomeGenPtr a_BiomeGen);
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protected:
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typedef cChunkDef::BiomeMap BiomeNeighbors[3][3];
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// Linear upscaling step sizes, must be divisors of cChunkDef::Width and cChunkDef::Height, respectively:
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static const int INTERPOL_X = 8;
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static const int INTERPOL_Y = 4;
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static const int INTERPOL_Z = 8;
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// Linear upscaling buffer dimensions, calculated from the step sizes:
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static const int DIM_X = 1 + (17 / INTERPOL_X);
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static const int DIM_Y = 1 + (257 / INTERPOL_Y);
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static const int DIM_Z = 1 + (17 / INTERPOL_Z);
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cPerlinNoise m_NoiseDistortX;
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cPerlinNoise m_NoiseDistortZ;
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cNoise m_OceanFloorSelect; ///< Used for selecting between dirt and sand on the ocean floor
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cNoise m_MesaFloor; ///< Used for the floor of the clay blocks in mesa biomes
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int m_SeaLevel;
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NOISE_DATATYPE m_FrequencyX;
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NOISE_DATATYPE m_FrequencyY;
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NOISE_DATATYPE m_FrequencyZ;
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int m_CurChunkX;
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int m_CurChunkZ;
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NOISE_DATATYPE m_DistortedHeightmap[17 * 257 * 17];
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/** The bime generator to query for biomes. */
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cBiomeGenPtr m_BiomeGen;
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/** The generator that provides the base heightmap (before distortion). */
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cTerrainHeightGenPtr m_UnderlyingHeiGen;
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/** Cache for m_UnderlyingHeiGen. */
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cHeiGenCache m_HeightGen;
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/// Heightmap for the current chunk, before distortion (from m_HeightGen). Used for optimization.
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cChunkDef::HeightMap m_CurChunkHeights;
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// Per-biome terrain generator parameters:
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struct sGenParam
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{
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NOISE_DATATYPE m_DistortAmpX;
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NOISE_DATATYPE m_DistortAmpZ;
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} ;
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static const sGenParam m_GenParam[256];
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// Distortion amplitudes for each direction, before linear upscaling
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NOISE_DATATYPE m_DistortAmpX[DIM_X * DIM_Z];
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NOISE_DATATYPE m_DistortAmpZ[DIM_X * DIM_Z];
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/// True if Initialize() has been called. Used to initialize-once even with multiple init entrypoints (HeiGen / CompoGen)
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bool m_IsInitialized;
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/// The vertical pattern to be used for mesa biomes. Seed-dependant.
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/// One Height of pattern and one Height of stone to avoid checking pattern dimensions
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sBlockInfo m_MesaPattern[2 * cChunkDef::Height];
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/// Initializes m_MesaPattern with a reasonable pattern of stained clay / hardened clay, based on the seed
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void InitMesaPattern(int a_Seed);
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/// Unless the LastChunk coords are equal to coords given, prepares the internal state (noise arrays, heightmap)
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void PrepareState(int a_ChunkX, int a_ChunkZ);
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/// Generates the m_DistortedHeightmap array for the current chunk
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void GenerateHeightArray(void);
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/// Calculates the heightmap value (before distortion) at the specified (floating-point) coords
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int GetHeightmapAt(NOISE_DATATYPE a_X, NOISE_DATATYPE a_Z);
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/// Updates m_DistortAmpX/Z[] based on m_CurChunkX and m_CurChunkZ
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void UpdateDistortAmps(void);
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/// Calculates the X and Z distortion amplitudes based on the neighbors' biomes
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void GetDistortAmpsAt(BiomeNeighbors & a_Neighbors, int a_RelX, int a_RelZ, NOISE_DATATYPE & a_DistortAmpX, NOISE_DATATYPE & a_DistortAmpZ);
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/// Reads the settings from the ini file. Skips reading if already initialized
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void Initialize(cIniFile & a_IniFile);
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/// Composes a single column in a_ChunkDesc. Chooses what to do based on the biome in that column
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void ComposeColumn(cChunkDesc & a_ChunkDesc, int a_RelX, int a_RelZ);
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/// Fills the specified column with the specified pattern; restarts the pattern when air is reached,
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/// switches to ocean floor pattern if ocean is reached. Always adds bedrock at the very bottom.
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void FillColumnPattern(cChunkDesc & a_ChunkDesc, int a_RelX, int a_RelZ, const sBlockInfo * a_Pattern);
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/// Fills the specified column with mesa pattern, based on the column height
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void FillColumnMesa(cChunkDesc & a_ChunkDesc, int a_RelX, int a_RelZ);
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/// Returns the pattern to use for an ocean floor in the specified column
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const sBlockInfo * ChooseOceanFloorPattern(int a_RelX, int a_RelZ);
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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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// cTerrainCompositionGen overrides:
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virtual void ComposeTerrain(cChunkDesc & a_ChunkDesc) override;
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virtual void InitializeCompoGen(cIniFile & a_IniFile) override;
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} ;
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