DistortedHeightmap.h

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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, 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;

    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];

    cBiomeGenPtr m_BiomeGen;

    cTerrainHeightGenPtr m_UnderlyingHeiGen;

    cHeiGenCache m_HeightGen;

    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];

    bool m_IsInitialized;


    void PrepareState(cChunkCoords a_ChunkCoords);

    void GenerateHeightArray(void);

    int GetHeightmapAt(NOISE_DATATYPE a_X, NOISE_DATATYPE a_Z);

    void UpdateDistortAmps(void);

    void GetDistortAmpsAt(BiomeNeighbors & a_Neighbors, int a_RelX, int a_RelZ, NOISE_DATATYPE & a_DistortAmpX, NOISE_DATATYPE & a_DistortAmpZ);

    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;
} ;