1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
// EndGen.cpp
// Implements the cEndGen class representing the generator for the End, both as a HeightGen and CompositionGen
#include "Globals.h"
#include "EndGen.h"
#include "../IniFile.h"
#include "../LinearUpscale.h"
enum
{
// Interpolation cell size:
INTERPOL_X = 4,
INTERPOL_Y = 4,
INTERPOL_Z = 4,
// Size of chunk data, downscaled before interpolation:
DIM_X = 16 / INTERPOL_X + 1,
DIM_Y = 256 / INTERPOL_Y + 1,
DIM_Z = 16 / INTERPOL_Z + 1,
} ;
////////////////////////////////////////////////////////////////////////////////
// cEndGen:
cEndGen::cEndGen(int a_Seed) :
m_Seed(a_Seed),
m_Perlin(a_Seed),
m_VoidOffsetNoise(a_Seed + 1000),
m_AirThresholdMainIsland(0.0f),
m_AirThresholdOtherIslands(0.5f),
m_MainIslandSize(450),
m_BaseHeight(64),
m_TerrainTopMultiplier(10),
m_TerrainBottomMultiplier(40),
m_VoidOffsetNoiseMultiplier(50),
m_FrequencyX(80),
m_FrequencyY(80),
m_FrequencyZ(80)
{
m_Perlin.AddOctave(1, 1);
m_Perlin.AddOctave(2, 0.5);
m_Perlin.AddOctave(4, 0.25);
m_VoidOffsetNoise.AddOctave(1, 1);
m_VoidOffsetNoise.AddOctave(2, 0.5);
m_VoidOffsetNoise.AddOctave(4, 0.25);
}
void cEndGen::InitializeShapeGen(cIniFile & a_IniFile)
{
m_AirThresholdMainIsland = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenAirThresholdMainIsland", m_AirThresholdMainIsland));
m_AirThresholdOtherIslands = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenAirThresholdOtherIslands", m_AirThresholdOtherIslands));
m_MainIslandSize = a_IniFile.GetValueSetI("Generator", "EndGenMainIslandSize", m_MainIslandSize);
m_BaseHeight = a_IniFile.GetValueSetI("Generator", "EndGenBaseHeight", m_BaseHeight);
m_TerrainTopMultiplier = a_IniFile.GetValueSetI("Generator", "EndGenTerrainTopMultipler", m_TerrainTopMultiplier);
m_TerrainBottomMultiplier = a_IniFile.GetValueSetI("Generator", "EndGenTerrainBottomMultiplier", m_TerrainBottomMultiplier);
m_VoidOffsetNoiseMultiplier = a_IniFile.GetValueSetI("Generator", "EndGenVoidOffsetNoiseMultiplier", m_VoidOffsetNoiseMultiplier);
m_FrequencyX = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenFrequencyX", m_FrequencyX));
m_FrequencyY = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenFrequencyY", m_FrequencyY));
m_FrequencyZ = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenFrequencyZ", m_FrequencyZ));
}
void cEndGen::GenShape(cChunkCoords a_ChunkCoords, cChunkDesc::Shape & a_Shape)
{
for (size_t i = 0; i < ARRAYCOUNT(a_Shape); i++)
{
a_Shape[i] = 0;
}
NOISE_DATATYPE NoiseData[cChunkDef::Width * cChunkDef::Width];
NOISE_DATATYPE VoidOffsetData[cChunkDef::Width * cChunkDef::Width];
NOISE_DATATYPE Workspace[cChunkDef::Width * cChunkDef::Width];
NOISE_DATATYPE StartX = static_cast<NOISE_DATATYPE>(a_ChunkCoords.m_ChunkX * cChunkDef::Width) / m_FrequencyX;
NOISE_DATATYPE EndX = static_cast<NOISE_DATATYPE>((a_ChunkCoords.m_ChunkX + 1) * cChunkDef::Width) / m_FrequencyX;
NOISE_DATATYPE StartZ = static_cast<NOISE_DATATYPE>(a_ChunkCoords.m_ChunkZ * cChunkDef::Width) / m_FrequencyZ;
NOISE_DATATYPE EndZ = static_cast<NOISE_DATATYPE>((a_ChunkCoords.m_ChunkZ + 1) * cChunkDef::Width) / m_FrequencyZ;
m_Perlin.Generate2D(NoiseData, cChunkDef::Width, cChunkDef::Width, StartX, EndX, StartZ, EndZ, Workspace);
m_VoidOffsetNoise.Generate2D(VoidOffsetData, cChunkDef::Width, cChunkDef::Width, StartX, EndX, StartZ, EndZ, Workspace);
for (int z = 0; z < cChunkDef::Width; z++)
{
for (int x = 0; x < cChunkDef::Width; x++)
{
NOISE_DATATYPE noise = NoiseData[z * cChunkDef::Width + x];
// The distance from spawn is used to create the void between the main island and the other islands.
double distanceFromSpawn = cChunkDef::RelativeToAbsolute({ x, 0, z }, a_ChunkCoords).Length();
// The main island can get a different airthreshold. This way the other island can be more sparse while the main island
// is one big island.
if (distanceFromSpawn > m_MainIslandSize)
{
if (noise <= m_AirThresholdOtherIslands)
{
continue;
}
noise -= m_AirThresholdOtherIslands;
}
else
{
if (noise <= m_AirThresholdMainIsland)
{
continue;
}
noise -= m_AirThresholdMainIsland;
}
NOISE_DATATYPE voidOffset = VoidOffsetData[z * cChunkDef::Width + x];
double maxHeightLimit;
if (distanceFromSpawn > m_MainIslandSize * 3)
{
// The distance from spawn is so big we don't need to calculate the max height anymore.
// In fact, if we don't cut it off somewhere there is a chance the maxheight gets too big which
// can cause corrupted looking terrain.
maxHeightLimit = static_cast<float>(cChunkDef::Height);
}
else
{
// Create a void between the main island and the other island using the formula 'x^3 - 3 * x' where x is distance from spawn.
double pow = std::pow((distanceFromSpawn - m_MainIslandSize) / m_MainIslandSize, 3);
double mult = 3 * ((distanceFromSpawn - m_MainIslandSize) / m_MainIslandSize);
maxHeightLimit = Clamp((pow - mult) * 100 + static_cast<double>(voidOffset) * m_VoidOffsetNoiseMultiplier, 0.0, static_cast<double>(cChunkDef::Height));
}
int maxHeight = static_cast<int>(Clamp(m_BaseHeight + static_cast<double>(noise) * m_TerrainTopMultiplier, 0.0, maxHeightLimit));
int minHeight = static_cast<int>(Clamp(m_BaseHeight - static_cast<double>(noise) * m_TerrainBottomMultiplier, 0.0, static_cast<double>(cChunkDef::Height)));
for (int y = minHeight; y < maxHeight; y++)
{
a_Shape[y + x * 256 + z * 256 * 16] = 1;
}
}
}
}
void cEndGen::ComposeTerrain(cChunkDesc & a_ChunkDesc, const cChunkDesc::Shape & a_Shape)
{
a_ChunkDesc.FillBlocks(E_BLOCK_AIR, 0);
for (int z = 0; z < cChunkDef::Width; z++)
{
for (int x = 0; x < cChunkDef::Width; x++)
{
for (int y = 0; y < cChunkDef::Height; y++)
{
if (a_Shape[(x + 16 * z) * 256 + y] != 0)
{
a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_END_STONE);
}
} // for y
} // for x
} // for z
}
|
