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authorAlexander Harkness <bearbin@gmail.com>2013-11-24 15:19:41 +0100
committerAlexander Harkness <bearbin@gmail.com>2013-11-24 15:19:41 +0100
commit675b4aa878f16291ce33fced48a2bc7425f635ae (patch)
tree409914df27a98f65adf866da669429c4de141b6f /src/Generating/DistortedHeightmap.h
parentLineBlockTracer: Using the coord-based block faces. (diff)
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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;
+} ;