void cNoise3DGenerator::GenerateNoiseArray(int a_ChunkX, int a_ChunkZ, NOISE_DATATYPE * a_OutNoise)
{
NOISE_DATATYPE NoiseO[DIM_X * DIM_Y * DIM_Z]; // Output for the Perlin noise
NOISE_DATATYPE NoiseW[DIM_X * DIM_Y * DIM_Z]; // Workspace that the noise calculation can use and trash
// Our noise array has different layout, XZY, instead of regular chunk's XYZ, that's why the coords are "renamed"
NOISE_DATATYPE StartX = ((NOISE_DATATYPE)(a_ChunkX * cChunkDef::Width)) / m_FrequencyX;
NOISE_DATATYPE EndX = ((NOISE_DATATYPE)((a_ChunkX + 1) * cChunkDef::Width)) / m_FrequencyX;
NOISE_DATATYPE StartZ = ((NOISE_DATATYPE)(a_ChunkZ * cChunkDef::Width)) / m_FrequencyZ;
NOISE_DATATYPE EndZ = ((NOISE_DATATYPE)((a_ChunkZ + 1) * cChunkDef::Width)) / m_FrequencyZ;
NOISE_DATATYPE StartY = 0;
NOISE_DATATYPE EndY = ((NOISE_DATATYPE)256) / m_FrequencyY;
m_Perlin.Generate3D(NoiseO, DIM_X, DIM_Y, DIM_Z, StartX, EndX, StartY, EndY, StartZ, EndZ, NoiseW);
// DEBUG: Debug3DNoise(NoiseO, DIM_X, DIM_Y, DIM_Z, Printf("Chunk_%d_%d_orig", a_ChunkX, a_ChunkZ));
// Precalculate a "height" array:
NOISE_DATATYPE Height[DIM_X * DIM_Z]; // Output for the cubic noise heightmap ("source")
m_Cubic.Generate2D(Height, DIM_X, DIM_Z, StartX / 5, EndX / 5, StartZ / 5, EndZ / 5);
for (size_t i = 0; i < ARRAYCOUNT(Height); i++)
{
Height[i] = Height[i] * m_HeightAmplification;
}
// Modify the noise by height data:
for (int y = 0; y < DIM_Y; y++)
{
NOISE_DATATYPE AddHeight = (y * UPSCALE_Y - m_MidPoint) / 30;
// AddHeight *= AddHeight * AddHeight;
for (int z = 0; z < DIM_Z; z++)
{
NOISE_DATATYPE * CurRow = &(NoiseO[y * DIM_X + z * DIM_X * DIM_Y]);
for (int x = 0; x < DIM_X; x++)
{
CurRow[x] += AddHeight + Height[x + DIM_X * z];
}
}
}
// DEBUG: Debug3DNoise(NoiseO, DIM_X, DIM_Y, DIM_Z, Printf("Chunk_%d_%d_hei", a_ChunkX, a_ChunkZ));
// Upscale the Perlin noise into full-blown chunk dimensions:
LinearUpscale3DArray(
NoiseO, DIM_X, DIM_Y, DIM_Z,
a_OutNoise, UPSCALE_X, UPSCALE_Y, UPSCALE_Z
);
// DEBUG: Debug3DNoise(a_OutNoise, 17, 257, 17, Printf("Chunk_%d_%d_lerp", a_ChunkX, a_ChunkZ));
}
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 = ((NOISE_DATATYPE)(m_CurChunkX * cChunkDef::Width)) / m_FrequencyX;
NOISE_DATATYPE EndX = ((NOISE_DATATYPE)((m_CurChunkX + 1) * cChunkDef::Width - 1)) / m_FrequencyX;
NOISE_DATATYPE StartY = 0;
NOISE_DATATYPE EndY = ((NOISE_DATATYPE)(257)) / m_FrequencyY;
NOISE_DATATYPE StartZ = ((NOISE_DATATYPE)(m_CurChunkZ * cChunkDef::Width)) / m_FrequencyZ;
NOISE_DATATYPE EndZ = ((NOISE_DATATYPE)((m_CurChunkZ + 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 += (NOISE_DATATYPE)(m_CurChunkX * cChunkDef::Width + x * INTERPOL_X);
DistZ += (NOISE_DATATYPE)(m_CurChunkZ * cChunkDef::Width + z * INTERPOL_Z);
// Adding 0.5 helps alleviate the interpolation artifacts
DistHei[NoiseArrayIdx + x] = (NOISE_DATATYPE)GetHeightmapAt(DistX, DistZ) + (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));
}
// cTerrainShapeGen override:
virtual void GenShape(int a_ChunkX, int a_ChunkZ, cChunkDesc::Shape & a_Shape) override
{
// Generate the two heightmaps:
cChunkDef::HeightMap heightsA;
cChunkDef::HeightMap heightsB;
m_HeightA.GenHeightMap(a_ChunkX, a_ChunkZ, heightsA);
m_HeightB.GenHeightMap(a_ChunkX, a_ChunkZ, heightsB);
// Generate the choice noise:
NOISE_DATATYPE smallChoice[33 * 5 * 5];
NOISE_DATATYPE workspace[33 * 5 * 5];
NOISE_DATATYPE startX = 0;
NOISE_DATATYPE endX = 256 * m_FrequencyY;
NOISE_DATATYPE startY = a_ChunkX * cChunkDef::Width * m_FrequencyX;
NOISE_DATATYPE endY = (a_ChunkX * cChunkDef::Width + cChunkDef::Width + 1) * m_FrequencyX;
NOISE_DATATYPE startZ = a_ChunkZ * cChunkDef::Width * m_FrequencyZ;
NOISE_DATATYPE endZ = (a_ChunkZ * cChunkDef::Width + cChunkDef::Width + 1) * m_FrequencyZ;
m_Choice.Generate3D(smallChoice, 33, 5, 5, startX, endX, startY, endY, startZ, endZ, workspace);
NOISE_DATATYPE choice[257 * 17 * 17];
LinearUpscale3DArray(smallChoice, 33, 5, 5, choice, 8, 4, 4);
// Generate the shape:
int idxShape = 0;
for (int z = 0; z < cChunkDef::Width; z++)
{
for (int x = 0; x < cChunkDef::Width; x++)
{
int idxChoice = 257 * 17 * z + 257 * x;
NOISE_DATATYPE heightA = static_cast<NOISE_DATATYPE>(cChunkDef::GetHeight(heightsA, x, z));
NOISE_DATATYPE heightB = static_cast<NOISE_DATATYPE>(cChunkDef::GetHeight(heightsB, x, z));
for (int y = 0; y < cChunkDef::Height; y++)
{
int height = static_cast<int>(ClampedLerp(heightA, heightB, choice[idxChoice++]));
a_Shape[idxShape++] = (y < height) ? 1 : 0;
}
} // for x
} // for z
}
/// Generates the m_NoiseArray array for the current chunk
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]
// Generate the downscaled noise:
NOISE_DATATYPE StartX = ((NOISE_DATATYPE)(m_LastChunkX * cChunkDef::Width)) / m_FrequencyX;
NOISE_DATATYPE EndX = ((NOISE_DATATYPE)((m_LastChunkX + 1) * cChunkDef::Width)) / m_FrequencyX;
NOISE_DATATYPE StartZ = ((NOISE_DATATYPE)(m_LastChunkZ * cChunkDef::Width)) / m_FrequencyZ;
NOISE_DATATYPE EndZ = ((NOISE_DATATYPE)((m_LastChunkZ + 1) * cChunkDef::Width)) / m_FrequencyZ;
NOISE_DATATYPE StartY = 0;
NOISE_DATATYPE EndY = ((NOISE_DATATYPE)257) / m_FrequencyY;
m_Perlin.Generate3D(NoiseData, DIM_X, DIM_Z, DIM_Y, StartX, EndX, StartZ, EndZ, StartY, EndY, Workspace);
// Add distance:
int idx = 0;
for (int y = 0; y < DIM_Y; y++)
{
NOISE_DATATYPE ValY = (NOISE_DATATYPE)(2 * INTERPOL_Y * y - m_IslandSizeY) / m_IslandSizeY;
ValY = ValY * ValY;
for (int z = 0; z < DIM_Z; z++)
{
NOISE_DATATYPE ValZ = (NOISE_DATATYPE)(m_LastChunkZ * cChunkDef::Width + (z * cChunkDef::Width / (DIM_Z - 1))) / m_IslandSizeZ;
ValZ = ValZ * ValZ;
for (int x = 0; x < DIM_X; x++)
{
// NOISE_DATATYPE ValX = StartX + (EndX - StartX) * x / (DIM_X - 1);
NOISE_DATATYPE ValX = (NOISE_DATATYPE)(m_LastChunkX * cChunkDef::Width + (x * cChunkDef::Width / (DIM_X - 1))) / m_IslandSizeX;
ValX = ValX * ValX;
NoiseData[idx++] += ValX + ValZ + 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);
}
