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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"
#define NOISE_SIZE_Y (257 + 32)
class cDistortedHeightmap : public cTerrainShapeGen
{
public:
cDistortedHeightmap(int a_Seed, cBiomeGen & 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;
int m_SeaLevel;
NOISE_DATATYPE m_FrequencyX;
NOISE_DATATYPE m_FrequencyY;
NOISE_DATATYPE m_FrequencyZ;
cChunkCoords m_CurChunkCoords;
NOISE_DATATYPE m_DistortedHeightmap[17 * 257 * 17];
/** The bime generator to query for biomes. */
cBiomeGen & m_BiomeGen;
/** The generator that provides the base heightmap (before distortion). */
cHeiGenBiomal 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;
/** Unless the LastChunk coords are equal to coords given, prepares the internal state (noise arrays, heightmap). */
void PrepareState(cChunkCoords a_ChunkCoords);
/** 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);
// cTerrainShapeGen overrides:
virtual void GenShape(cChunkCoords a_ChunkCoords, cChunkDesc::Shape & a_Shape) override;
virtual void InitializeShapeGen(cIniFile & a_IniFile) override;
};
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