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