1 files changed, 108 insertions, 0 deletions

diff --git a/src/Generating/DistortedHeightmap.h b/src/Generating/DistortedHeightmap.h
new file mode 100644
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+++ b/src/Generating/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"
+#include "../Noise.h"
+
+
+
+
+
+#define NOISE_SIZE_Y (257 + 32)
+
+
+
+
+
+class cDistortedHeightmap :
+	public cTerrainHeightGen,
+	public cTerrainCompositionGen
+{
+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;
+	cNoise       m_OceanFloorSelect;  ///< Used for selecting between dirt and sand on the ocean floor
+
+	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];
+
+	cBiomeGen &   m_BiomeGen;
+	cHeiGenBiomal m_UnderlyingHeiGen;  // This generator provides us with base heightmap (before distortion)
+	cHeiGenCache  m_HeightGen;         // Cache above m_UnderlyingHeiGen
+	
+	/// 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[biNumBiomes];
+	
+	// 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(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);
+	
+	
+	// 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;
+} ;