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cuberite-2a/src/Generating/DistortedHeightmap.cpp

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// DistortedHeightmap.cpp
// Implements the cDistortedHeightmap class representing the height and composition generator capable of overhangs
#include "Globals.h"
#include "DistortedHeightmap.h"
#include "../IniFile.h"
#include "../LinearUpscale.h"
////////////////////////////////////////////////////////////////////////////////
// cDistortedHeightmap:
/** This table assigns a relative maximum overhang size in each direction to biomes.
Both numbers indicate a number which will multiply the noise value for each coord;
this means that you can have different-sized overhangs in each direction.
Usually you'd want to keep both numbers the same.
The numbers are "relative", not absolute maximum; overhangs of a slightly larger size are possible
due to the way that noise is calculated.
*/
const cDistortedHeightmap::sGenParam cDistortedHeightmap::m_GenParam[256] =
{
/* Biome | AmpX | AmpZ */
/* biOcean */ { 1.5f, 1.5f},
/* biPlains */ { 0.5f, 0.5f},
/* biDesert */ { 0.5f, 0.5f},
/* biExtremeHills */ {16.0f, 16.0f},
/* biForest */ { 3.0f, 3.0f},
/* biTaiga */ { 1.5f, 1.5f},
/* biSwampland */ { 0.0f, 0.0f},
/* biRiver */ { 0.0f, 0.0f},
/* biNether */ { 0.0f, 0.0f}, // Unused, but must be here due to indexing
/* biSky */ { 0.0f, 0.0f}, // Unused, but must be here due to indexing
/* biFrozenOcean */ { 0.0f, 0.0f},
/* biFrozenRiver */ { 0.0f, 0.0f},
/* biIcePlains */ { 0.0f, 0.0f},
/* biIceMountains */ { 8.0f, 8.0f},
/* biMushroomIsland */ { 4.0f, 4.0f},
/* biMushroomShore */ { 0.0f, 0.0f},
/* biBeach */ { 0.0f, 0.0f},
/* biDesertHills */ { 5.0f, 5.0f},
/* biForestHills */ { 6.0f, 6.0f},
/* biTaigaHills */ { 8.0f, 8.0f},
/* biExtremeHillsEdge */ { 7.0f, 7.0f},
/* biJungle */ { 4.0f, 4.0f},
/* biJungleHills */ { 8.0f, 8.0f},
/* biJungleEdge */ { 3.0f, 3.0f}, // 23
/* biDeepOcean */ { 1.0f, 1.0f}, // 24
/* biStoneBeach */ { 1.0f, 1.0f}, // 25
/* biColdBeach */ { 1.0f, 1.0f}, // 26
/* biBirchForest */ { 3.0f, 3.0f}, // 27
/* biBirchForestHills */ { 6.0f, 6.0f}, // 28
/* biRoofedForest */ { 3.0f, 3.0f}, // 29
/* biColdTaiga */ { 0.5f, 0.5f}, // 30
/* biColdTaigaHills */ { 4.0f, 4.0f}, // 31
/* biMegaTaiga */ { 1.0f, 1.0f}, // 32
/* biMegaTaigaHills */ { 4.0f, 4.0f}, // 33
/* biExtremeHillsPlus */ {32.0f, 32.0f}, // 34 - anyone say extreme plus? Make it extreme plus, then :)
/* biSavanna */ { 2.0f, 2.0f}, // 35
/* biSavannaPlateau */ { 3.0f, 3.0f}, // 36
/* biMesa */ { 2.0f, 2.0f}, // 37
/* biMesaPlateauF */ { 2.0f, 2.0f}, // 38
/* biMesaPlateau */ { 2.0f, 2.0f}, // 39
// biomes 40 .. 128 are unused, 89 empty placeholders here:
{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, // 40 .. 49
{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, // 50 .. 59
{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, // 60 .. 69
{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, // 70 .. 79
{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, // 80 .. 89
{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, // 90 .. 99
{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, // 100 .. 109
{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, // 110 .. 119
{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, // 120 .. 128
// Release 1.7 biome variants:
/* biSunflowerPlains */ { 1.0f, 1.0f}, // 129
/* biDesertM */ { 1.0f, 1.0f}, // 130
/* biExtremeHillsM */ {16.0f, 16.0f}, // 131
/* biFlowerForest */ { 4.0f, 4.0f}, // 132
/* biTaigaM */ { 3.0f, 3.0f}, // 133
/* biSwamplandM */ { 0.0f, 0.0f}, // 134
// Biomes 135 .. 139 unused, 5 empty placeholders here:
{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, // 135 .. 139
/* biIcePlainsSpikes */ { 1.0f, 1.0f}, // 140
// Biomes 141 .. 148 unused, 8 empty placeholders here:
{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, // 141 .. 148
/* biJungleM */ { 4.0f, 4.0f}, // 149
{0.0f, 0.0f}, // 150
/* biJungleEdgeM */ { 3.0f, 3.0f}, // 151
{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, // 152 .. 154
/* biBirchForestM */ { 3.0f, 3.0f}, // 155
/* biBirchForestHillsM */ { 5.0f, 5.0f}, // 156
/* biRoofedForestM */ { 2.0f, 2.0f}, // 157
/* biColdTaigaM */ { 1.0f, 1.0f}, // 158
{0.0f, 0.0f}, // 159
/* biMegaSpruceTaiga */ { 3.0f, 3.0f}, // 160
/* biMegaSpruceTaigaHills */ { 3.0f, 3.0f}, // 161
/* biExtremeHillsPlusM */ {32.0f, 32.0f}, // 162
/* biSavannaM */ { 2.0f, 2.0f}, // 163
/* biSavannaPlateauM */ { 3.0f, 3.0f}, // 164
/* biMesaBryce */ { 0.5f, 0.5f}, // 165
/* biMesaPlateauFM */ { 2.0f, 2.0f}, // 166
/* biMesaPlateauM */ { 2.0f, 2.0f}, // 167
} ;
cDistortedHeightmap::cDistortedHeightmap(int a_Seed, cBiomeGen & a_BiomeGen) :
m_NoiseDistortX(a_Seed + 1000),
m_NoiseDistortZ(a_Seed + 2000),
m_CurChunkCoords(0x7fffffff, 0x7fffffff), // Set impossible coords for the chunk so that it's always considered stale
m_BiomeGen(a_BiomeGen),
m_UnderlyingHeiGen(a_Seed, a_BiomeGen),
m_HeightGen(m_UnderlyingHeiGen, 64),
m_IsInitialized(false)
{
m_NoiseDistortX.AddOctave(static_cast<NOISE_DATATYPE>(1), static_cast<NOISE_DATATYPE>(0.5));
m_NoiseDistortX.AddOctave(static_cast<NOISE_DATATYPE>(0.5), static_cast<NOISE_DATATYPE>(1));
m_NoiseDistortX.AddOctave(static_cast<NOISE_DATATYPE>(0.25), static_cast<NOISE_DATATYPE>(2));
m_NoiseDistortZ.AddOctave(static_cast<NOISE_DATATYPE>(1), static_cast<NOISE_DATATYPE>(0.5));
m_NoiseDistortZ.AddOctave(static_cast<NOISE_DATATYPE>(0.5), static_cast<NOISE_DATATYPE>(1));
m_NoiseDistortZ.AddOctave(static_cast<NOISE_DATATYPE>(0.25), static_cast<NOISE_DATATYPE>(2));
}
void cDistortedHeightmap::Initialize(cIniFile & a_IniFile)
{
if (m_IsInitialized)
{
return;
}
// Read the params from the INI file:
m_SeaLevel = a_IniFile.GetValueSetI("Generator", "SeaLevel", 62);
m_FrequencyX = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "DistortedHeightmapFrequencyX", 10));
m_FrequencyY = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "DistortedHeightmapFrequencyY", 10));
m_FrequencyZ = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "DistortedHeightmapFrequencyZ", 10));
m_IsInitialized = true;
}
void cDistortedHeightmap::PrepareState(cChunkCoords a_ChunkCoords)
{
if (m_CurChunkCoords == a_ChunkCoords)
{
return;
}
m_CurChunkCoords = a_ChunkCoords;
m_HeightGen.GenHeightMap(a_ChunkCoords, m_CurChunkHeights);
UpdateDistortAmps();
GenerateHeightArray();
}
void cDistortedHeightmap::GenerateHeightArray(void)
{
// Generate distortion noise:
NOISE_DATATYPE DistortNoiseX[DIM_X * DIM_Y * DIM_Z];
NOISE_DATATYPE DistortNoiseZ[DIM_X * DIM_Y * DIM_Z];
NOISE_DATATYPE Workspace[DIM_X * DIM_Y * DIM_Z];
NOISE_DATATYPE StartX = static_cast<NOISE_DATATYPE>(m_CurChunkCoords.m_ChunkX * cChunkDef::Width) / m_FrequencyX;
NOISE_DATATYPE EndX = static_cast<NOISE_DATATYPE>((m_CurChunkCoords.m_ChunkX + 1) * cChunkDef::Width - 1) / m_FrequencyX;
NOISE_DATATYPE StartY = 0;
NOISE_DATATYPE EndY = static_cast<NOISE_DATATYPE>(257) / m_FrequencyY;
NOISE_DATATYPE StartZ = static_cast<NOISE_DATATYPE>(m_CurChunkCoords.m_ChunkZ * cChunkDef::Width) / m_FrequencyZ;
NOISE_DATATYPE EndZ = static_cast<NOISE_DATATYPE>((m_CurChunkCoords.m_ChunkZ + 1) * cChunkDef::Width - 1) / m_FrequencyZ;
m_NoiseDistortX.Generate3D(DistortNoiseX, DIM_X, DIM_Y, DIM_Z, StartX, EndX, StartY, EndY, StartZ, EndZ, Workspace);
m_NoiseDistortZ.Generate3D(DistortNoiseZ, DIM_X, DIM_Y, DIM_Z, StartX, EndX, StartY, EndY, StartZ, EndZ, Workspace);
// The distorted heightmap, before linear upscaling
NOISE_DATATYPE DistHei[DIM_X * DIM_Y * DIM_Z];
// Distort the heightmap using the distortion:
for (int z = 0; z < DIM_Z; z++)
{
int AmpIdx = z * DIM_X;
for (int y = 0; y < DIM_Y; y++)
{
int NoiseArrayIdx = z * DIM_X * DIM_Y + y * DIM_X;
for (int x = 0; x < DIM_X; x++)
{
NOISE_DATATYPE DistX = DistortNoiseX[NoiseArrayIdx + x] * m_DistortAmpX[AmpIdx + x];
NOISE_DATATYPE DistZ = DistortNoiseZ[NoiseArrayIdx + x] * m_DistortAmpZ[AmpIdx + x];
DistX += static_cast<NOISE_DATATYPE>(m_CurChunkCoords.m_ChunkX * cChunkDef::Width + x * INTERPOL_X);
DistZ += static_cast<NOISE_DATATYPE>(m_CurChunkCoords.m_ChunkZ * cChunkDef::Width + z * INTERPOL_Z);
// Adding 0.5 helps alleviate the interpolation artifacts
DistHei[NoiseArrayIdx + x] = static_cast<NOISE_DATATYPE>(GetHeightmapAt(DistX, DistZ)) + static_cast<NOISE_DATATYPE>(0.5);
}
}
}
// Upscale the distorted heightmap into full dimensions:
LinearUpscale3DArray(
DistHei, DIM_X, DIM_Y, DIM_Z,
m_DistortedHeightmap, INTERPOL_X, INTERPOL_Y, INTERPOL_Z
);
// DEBUG: Debug3DNoise(m_DistortedHeightmap, 17, 257, 17, Printf("DistortedHeightmap_%d_%d", m_CurChunkX, m_CurChunkZ));
}
void cDistortedHeightmap::GenShape(cChunkCoords a_ChunkCoords, cChunkDesc::Shape & a_Shape)
{
PrepareState(a_ChunkCoords);
for (int z = 0; z < cChunkDef::Width; z++)
{
for (int x = 0; x < cChunkDef::Width; x++)
{
int idx = x + 17 * 257 * z;
for (int y = 0; y < cChunkDef::Height; y++)
{
a_Shape[y + x * 256 + z * 16 * 256] = (y < m_DistortedHeightmap[idx + y * 17]) ? 1 : 0;
} // for y
} // for x
} // for z
}
void cDistortedHeightmap::InitializeShapeGen(cIniFile & a_IniFile)
{
Initialize(a_IniFile);
}
int cDistortedHeightmap::GetHeightmapAt(NOISE_DATATYPE a_X, NOISE_DATATYPE a_Z)
{
int RelX = FloorC(a_X);
int RelY = 0;
int RelZ = FloorC(a_Z);
int ChunkX, ChunkZ;
cChunkDef::AbsoluteToRelative(RelX, RelY, RelZ, ChunkX, ChunkZ);
// If we're within the same chunk, return the pre-cached heightmap:
if ((ChunkX == m_CurChunkCoords.m_ChunkX) && (ChunkZ == m_CurChunkCoords.m_ChunkZ))
{
return cChunkDef::GetHeight(m_CurChunkHeights, RelX, RelZ);
}
// Ask the cache:
HEIGHTTYPE res = 0;
if (m_HeightGen.GetHeightAt(ChunkX, ChunkZ, RelX, RelZ, res))
{
// The height was in the cache
return res;
}
// The height is not in the cache, generate full heightmap and get it there:
cChunkDef::HeightMap Heightmap;
m_HeightGen.GenHeightMap({ChunkX, ChunkZ}, Heightmap);
return cChunkDef::GetHeight(Heightmap, RelX, RelZ);
}
void cDistortedHeightmap::UpdateDistortAmps(void)
{
BiomeNeighbors Biomes;
for (int z = -1; z <= 1; z++)
{
for (int x = -1; x <= 1; x++)
{
m_BiomeGen.GenBiomes({m_CurChunkCoords.m_ChunkX + x, m_CurChunkCoords.m_ChunkZ + z}, Biomes[x + 1][z + 1]);
} // for x
} // for z
for (int z = 0; z < DIM_Z; z++)
{
for (int x = 0; x < DIM_Z; x++)
{
GetDistortAmpsAt(Biomes, x * INTERPOL_X, z * INTERPOL_Z, m_DistortAmpX[x + DIM_X * z], m_DistortAmpZ[x + DIM_X * z]);
}
}
}
void cDistortedHeightmap::GetDistortAmpsAt(BiomeNeighbors & a_Neighbors, int a_RelX, int a_RelZ, NOISE_DATATYPE & a_DistortAmpX, NOISE_DATATYPE & a_DistortAmpZ)
{
// Sum up how many biomes of each type there are in the neighborhood:
int BiomeCounts[256];
memset(BiomeCounts, 0, sizeof(BiomeCounts));
int Sum = 0;
for (int z = -8; z <= 8; z++)
{
int FinalZ = a_RelZ + z + cChunkDef::Width;
int IdxZ = FinalZ / cChunkDef::Width;
int ModZ = FinalZ % cChunkDef::Width;
int WeightZ = 9 - abs(z);
for (int x = -8; x <= 8; x++)
{
int FinalX = a_RelX + x + cChunkDef::Width;
int IdxX = FinalX / cChunkDef::Width;
int ModX = FinalX % cChunkDef::Width;
EMCSBiome Biome = cChunkDef::GetBiome(a_Neighbors[IdxX][IdxZ], ModX, ModZ);
int WeightX = 9 - abs(x);
BiomeCounts[Biome] += WeightX + WeightZ;
Sum += WeightX + WeightZ;
} // for x
} // for z
if (Sum <= 0)
{
// No known biome around? Weird. Return a bogus value:
ASSERT(!"cHeiGenBiomal: Biome sum failed, no known biome around");
a_DistortAmpX = 16;
a_DistortAmpZ = 16;
}
// For each biome type that has a nonzero count, calc its amps and add it:
NOISE_DATATYPE AmpX = 0;
NOISE_DATATYPE AmpZ = 0;
for (size_t i = 0; i < ARRAYCOUNT(BiomeCounts); i++)
{
if (BiomeCounts[i] <= 0)
{
continue;
}
/*
// Sanity checks for biome parameters, enable them to check the biome param table in runtime (slow):
ASSERT(m_GenParam[i].m_DistortAmpX >= 0);
ASSERT(m_GenParam[i].m_DistortAmpX < 100);
ASSERT(m_GenParam[i].m_DistortAmpX >= 0);
ASSERT(m_GenParam[i].m_DistortAmpX < 100);
*/
AmpX += BiomeCounts[i] * m_GenParam[i].m_DistortAmpX;
AmpZ += BiomeCounts[i] * m_GenParam[i].m_DistortAmpZ;
}
a_DistortAmpX = AmpX / Sum;
a_DistortAmpZ = AmpZ / Sum;
}
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