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// 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(m_Seed),
m_MainIslandSize(200),
m_IslandThickness(32),
m_IslandYOffset(30),
m_MainIslandFrequencyX(100),
m_MainIslandFrequencyY(80),
m_MainIslandFrequencyZ(100),
m_MainIslandMinThreshold(0.2f),
m_SmallIslandFrequencyX(50),
m_SmallIslandFrequencyY(80),
m_SmallIslandFrequencyZ(50),
m_SmallIslandMinThreshold(-0.5f),
m_LastChunkCoords(0x7fffffff, 0x7fffffff) // Use dummy coords that won't ever be used by real chunks
{
m_Perlin.AddOctave(1, 1);
m_Perlin.AddOctave(2, 0.5);
m_Perlin.AddOctave(4, 0.25);
}
void cEndGen::InitializeShapeGen(cIniFile & a_IniFile)
{
m_MainIslandSize = a_IniFile.GetValueSetI("Generator", "EndGenMainIslandSize", m_MainIslandSize);
m_IslandThickness = a_IniFile.GetValueSetI("Generator", "EndGenIslandThickness", m_IslandThickness);
m_IslandYOffset = a_IniFile.GetValueSetI("Generator", "EndGenIslandYOffset", m_IslandYOffset);
m_MainIslandFrequencyX = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenMainFrequencyX", m_MainIslandFrequencyX));
m_MainIslandFrequencyY = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenMainFrequencyY", m_MainIslandFrequencyY));
m_MainIslandFrequencyZ = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenMainFrequencyZ", m_MainIslandFrequencyZ));
m_MainIslandMinThreshold = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenMainMinThreshold", m_MainIslandMinThreshold));
m_SmallIslandFrequencyX = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenSmallFrequencyX", m_SmallIslandFrequencyX));
m_SmallIslandFrequencyY = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenSmallFrequencyY", m_SmallIslandFrequencyY));
m_SmallIslandFrequencyZ = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenSmallFrequencyZ", m_SmallIslandFrequencyZ));
m_SmallIslandMinThreshold = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenSmallMinThreshold", m_SmallIslandMinThreshold));
}
void cEndGen::PrepareState(cChunkCoords a_ChunkCoords)
{
if (m_LastChunkCoords == a_ChunkCoords)
{
return;
}
m_LastChunkCoords = a_ChunkCoords;
GenerateNoiseArray();
}
void cEndGen::GenerateNoiseArray(void)
{
NOISE_DATATYPE NoiseData[DIM_X * DIM_Y * DIM_Z]; // [x + DIM_X * z + DIM_X * DIM_Z * y]
NOISE_DATATYPE Workspace[DIM_X * DIM_Y * DIM_Z]; // [x + DIM_X * z + DIM_X * DIM_Z * y]
// Choose the frequency to use depending on the distance from spawn.
auto distanceFromSpawn = cChunkDef::RelativeToAbsolute({ cChunkDef::Width / 2, 0, cChunkDef::Width / 2 }, m_LastChunkCoords).Length();
auto frequencyX = distanceFromSpawn > m_MainIslandSize * 2 ? m_SmallIslandFrequencyX : m_MainIslandFrequencyX;
auto frequencyY = distanceFromSpawn > m_MainIslandSize * 2 ? m_SmallIslandFrequencyY : m_MainIslandFrequencyY;
auto frequencyZ = distanceFromSpawn > m_MainIslandSize * 2 ? m_SmallIslandFrequencyZ : m_MainIslandFrequencyZ;
// Generate the downscaled noise:
auto StartX = static_cast<NOISE_DATATYPE>(m_LastChunkCoords.m_ChunkX * cChunkDef::Width) / frequencyX;
auto EndX = static_cast<NOISE_DATATYPE>((m_LastChunkCoords.m_ChunkX + 1) * cChunkDef::Width) / frequencyX;
auto StartZ = static_cast<NOISE_DATATYPE>(m_LastChunkCoords.m_ChunkZ * cChunkDef::Width) / frequencyZ;
auto EndZ = static_cast<NOISE_DATATYPE>((m_LastChunkCoords.m_ChunkZ + 1) * cChunkDef::Width) / frequencyZ;
auto StartY = 0.0f;
auto EndY = static_cast<NOISE_DATATYPE>(cChunkDef::Height) / frequencyY;
m_Perlin.Generate3D(NoiseData, DIM_X, DIM_Z, DIM_Y, StartX, EndX, StartZ, EndZ, StartY, EndY, Workspace);
// Add distance:
for (int y = 0; y < DIM_Y; y++)
{
auto ValY = static_cast<NOISE_DATATYPE>(2 * INTERPOL_Y * y - m_IslandThickness) / m_IslandThickness;
ValY = static_cast<NOISE_DATATYPE>(std::pow(ValY, 6));
for (int z = 0; z < DIM_Z; z++)
{
for (int x = 0; x < DIM_X; x++)
{
NoiseData[x + DIM_X * z + DIM_X * DIM_Z * y] += ValY;
} // for x
} // for z
} // for y
// Upscale into real chunk size:
LinearUpscale3DArray(NoiseData, DIM_X, DIM_Z, DIM_Y, m_NoiseArray, INTERPOL_X, INTERPOL_Z, INTERPOL_Y);
}
void cEndGen::GenShape(cChunkCoords a_ChunkCoords, cChunkDesc::Shape & a_Shape)
{
PrepareState(a_ChunkCoords);
int MaxY = std::min(static_cast<int>(1.75 * m_IslandThickness + m_IslandYOffset), cChunkDef::Height - 1);
// Choose which threshold to use depending on the distance from spawn.
double chunkDistanceFromSpawn = cChunkDef::RelativeToAbsolute({ cChunkDef::Width / 2, 0, cChunkDef::Width / 2 }, a_ChunkCoords).Length();
double minThreshold = chunkDistanceFromSpawn > m_MainIslandSize * 2 ? m_SmallIslandMinThreshold : m_MainIslandMinThreshold;
for (int z = 0; z < cChunkDef::Width; z++)
{
for (int x = 0; x < cChunkDef::Width; x++)
{
// Calculate the required treshold based on the distance from spawn.
// This way a void can be generated between the main island and the other islands.
double distanceFromSpawn = cChunkDef::RelativeToAbsolute({ x, 0, z }, a_ChunkCoords).Length();
double pow = std::pow((distanceFromSpawn - m_MainIslandSize) / m_MainIslandSize / 2, 3);
double mult = 3 * ((distanceFromSpawn - m_MainIslandSize) / m_MainIslandSize);
double threshold = std::min(pow - mult, minThreshold);
for (int y = 0; y < m_IslandYOffset; y++)
{
cChunkDesc::SetShapeIsSolidAt(a_Shape, x, y, z, false);
}
for (int y = m_IslandYOffset; y < MaxY; y++)
{
cChunkDesc::SetShapeIsSolidAt(a_Shape, x, y, z, m_NoiseArray[(y - m_IslandYOffset) * 17 * 17 + z * 17 + x] <= threshold);
}
for (int y = MaxY; y < cChunkDef::Height; y++)
{
cChunkDesc::SetShapeIsSolidAt(a_Shape, x, y, z, false);
}
} // for x
} // for z
}
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 (cChunkDesc::GetShapeIsSolidAt(a_Shape, x, y, z))
{
a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_END_STONE);
}
} // for y
} // for x
} // for z
}
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