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// Nosie3DGenerator.cpp
// Generates terrain using 3D noise, rather than composing. Is a test.
#include "Globals.h"
#include "Noise3DGenerator.h"
#include "../OSSupport/File.h"
cNoise3DGenerator::cNoise3DGenerator(cChunkGenerator & a_ChunkGenerator) :
super(a_ChunkGenerator),
m_Noise1(0),
m_Noise2(0)
{
}
cNoise3DGenerator::~cNoise3DGenerator()
{
// Nothing needed yet
}
void cNoise3DGenerator::Initialize(cWorld * a_World, cIniFile & a_IniFile)
{
m_World = a_World;
// TODO: params
}
void cNoise3DGenerator::GenerateBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap)
{
for (int i = 0; i < ARRAYCOUNT(a_BiomeMap); i++)
{
a_BiomeMap[i] = biExtremeHills;
}
}
void cNoise3DGenerator::DoGenerate(int a_ChunkX, int a_ChunkZ, cChunkDesc & a_ChunkDesc)
{
// Parameters, TODO: Make some settable in the INI file
const int INTERPOL_X = 8;
const int INTERPOL_Y = 4;
const int INTERPOL_Z = 8;
const NOISE_DATATYPE FrequencyX = 20;
const NOISE_DATATYPE FrequencyY = 20;
const NOISE_DATATYPE FrequencyZ = 20;
const NOISE_DATATYPE MidPoint = 75; // Where the vertical "center" of the noise should be
const NOISE_DATATYPE AirThreshold = (NOISE_DATATYPE)0.5;
const int SeaLevel = 62;
NOISE_DATATYPE Noise[257 * 17 * 17]; // x + 17 * z + 17 * 17 * y
int idx = 0;
for (int y = 0; y < 257; y += INTERPOL_Y)
{
NOISE_DATATYPE NoiseY = ((NOISE_DATATYPE)y) / FrequencyY;
NOISE_DATATYPE AddHeight = NoiseY - (MidPoint / FrequencyY);
AddHeight *= AddHeight * AddHeight * AddHeight * AddHeight;
NOISE_DATATYPE * CurFloor = &(Noise[y * 17 * 17]);
for (int z = 0; z < 17; z += INTERPOL_Z)
{
NOISE_DATATYPE NoiseZ = ((NOISE_DATATYPE)(a_ChunkZ * cChunkDef::Width + z)) / FrequencyZ;
for (int x = 0; x < 17; x += INTERPOL_X)
{
NOISE_DATATYPE NoiseX = ((NOISE_DATATYPE)(a_ChunkX * cChunkDef::Width + x)) / FrequencyX;
CurFloor[x + 17 * z] =
m_Noise1.CubicNoise3D(NoiseX, NoiseY, NoiseZ) +
m_Noise2.CubicNoise3D(NoiseX / 2, NoiseY / 2, NoiseZ / 2) +
AddHeight;
}
}
// Linear-interpolate this XZ floor:
ArrayLinearInterpolate2D(CurFloor, 17, 17, INTERPOL_X, INTERPOL_Z);
}
// Finish the 3D linear interpolation by interpolating between each XZ-floors on the Y axis
for (int y = 1; y < cChunkDef::Height; y++)
{
if ((y % INTERPOL_Y) == 0)
{
// This is the interpolation source floor, already calculated
continue;
}
int LoFloorY = (y / INTERPOL_Y) * INTERPOL_Y;
int HiFloorY = LoFloorY + INTERPOL_Y;
NOISE_DATATYPE * LoFloor = &(Noise[LoFloorY * 17 * 17]);
NOISE_DATATYPE * HiFloor = &(Noise[HiFloorY * 17 * 17]);
NOISE_DATATYPE * CurFloor = &(Noise[y * 17 * 17]);
NOISE_DATATYPE Ratio = ((NOISE_DATATYPE)(y % INTERPOL_Y)) / INTERPOL_Y;
int idx = 0;
for (int z = 0; z < cChunkDef::Width; z++)
{
for (int x = 0; x < cChunkDef::Width; x++)
{
CurFloor[idx] = LoFloor[idx] + (HiFloor[idx] - LoFloor[idx]) * Ratio;
idx += 1;
}
idx += 1; // Skipping one X column
}
}
// The noise array is now fully interpolated
/*
// DEBUG: Output two images of the array, sliced by XY and XZ:
cFile f1;
if (f1.Open(Printf("Chunk_%d_%d_XY.raw", a_ChunkX, a_ChunkZ), cFile::fmWrite))
{
for (int z = 0; z < cChunkDef::Width; z++)
{
for (int y = 0; y < cChunkDef::Height; y++)
{
int idx = y * 17 * 17 + z * 17;
unsigned char buf[16];
for (int x = 0; x < cChunkDef::Width; x++)
{
buf[x] = (unsigned char)(std::min(256, std::max(0, (int)(128 + 128 * Noise[idx++]))));
}
f1.Write(buf, 16);
} // for y
} // for z
} // if (XY file open)
cFile f2;
if (f2.Open(Printf("Chunk_%d_%d_XZ.raw", a_ChunkX, a_ChunkZ), cFile::fmWrite))
{
for (int y = 0; y < cChunkDef::Height; y++)
{
for (int z = 0; z < cChunkDef::Width; z++)
{
int idx = y * 17 * 17 + z * 17;
unsigned char buf[16];
for (int x = 0; x < cChunkDef::Width; x++)
{
buf[x] = (unsigned char)(std::min(256, std::max(0, (int)(128 + 128 * Noise[idx++]))));
}
f2.Write(buf, 16);
} // for z
} // for y
} // if (XZ file open)
*/
// Output into chunk:
for (int y = 0; y < cChunkDef::Height; y++)
{
for (int z = 0; z < cChunkDef::Width; z++)
{
int idx = y * 17 * 17 + z * 17;
for (int x = 0; x < cChunkDef::Width; x++)
{
NOISE_DATATYPE n = Noise[idx++];
BLOCKTYPE BlockType;
if (n > AirThreshold)
{
BlockType = (y > SeaLevel) ? E_BLOCK_AIR : E_BLOCK_STATIONARY_WATER;
}
else
{
BlockType = E_BLOCK_STONE;
}
a_ChunkDesc.SetBlockType(x, y, z, BlockType);
}
}
}
// Update the heightmap:
for (int z = 0; z < cChunkDef::Width; z++)
{
for (int x = 0; x < cChunkDef::Width; x++)
{
for (int y = cChunkDef::Height - 1; y > 0; y--)
{
if (a_ChunkDesc.GetBlockType(x, y, z) != E_BLOCK_AIR)
{
a_ChunkDesc.SetHeight(x, z, y);
break;
}
} // for y
} // for x
} // for z
}
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