// HeiGen.cpp
// Implements the various terrain height generators
#include "Globals.h"
#include "HeiGen.h"
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cHeiGenFlat:
void cHeiGenFlat::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
{
for (int i = 0; i < ARRAYCOUNT(a_HeightMap); i++)
{
a_HeightMap[i] = m_Height;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cHeiGenCache:
cHeiGenCache::cHeiGenCache(cTerrainHeightGen * a_HeiGenToCache, int a_CacheSize) :
m_HeiGenToCache(a_HeiGenToCache),
m_CacheSize(a_CacheSize),
m_CacheOrder(new int[a_CacheSize]),
m_CacheData(new sCacheData[a_CacheSize]),
m_NumHits(0),
m_NumMisses(0),
m_TotalChain(0)
{
for (int i = 0; i < m_CacheSize; i++)
{
m_CacheOrder[i] = i;
m_CacheData[i].m_ChunkX = 0x7fffffff;
m_CacheData[i].m_ChunkZ = 0x7fffffff;
}
}
cHeiGenCache::~cHeiGenCache()
{
delete[] m_CacheData;
delete[] m_CacheOrder;
}
void cHeiGenCache::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
{
/*
if (((m_NumHits + m_NumMisses) % 1024) == 10)
{
LOGD("HeiGenCache: %d hits, %d misses, saved %.2f %%", m_NumHits, m_NumMisses, 100.0 * m_NumHits / (m_NumHits + m_NumMisses));
LOGD("HeiGenCache: Avg cache chain length: %.2f", (float)m_TotalChain / m_NumHits);
}
//*/
for (int i = 0; i < m_CacheSize; i++)
{
if (
(m_CacheData[m_CacheOrder[i]].m_ChunkX != a_ChunkX) ||
(m_CacheData[m_CacheOrder[i]].m_ChunkZ != a_ChunkZ)
)
{
continue;
}
// Found it in the cache
int Idx = m_CacheOrder[i];
// Move to front:
for (int j = i; j > 0; j--)
{
m_CacheOrder[j] = m_CacheOrder[j - 1];
}
m_CacheOrder[0] = Idx;
// Use the cached data:
memcpy(a_HeightMap, m_CacheData[Idx].m_HeightMap, sizeof(a_HeightMap));
m_NumHits++;
m_TotalChain += i;
return;
} // for i - cache
// Not in the cache:
m_NumMisses++;
m_HeiGenToCache->GenHeightMap(a_ChunkX, a_ChunkZ, a_HeightMap);
// Insert it as the first item in the MRU order:
int Idx = m_CacheOrder[m_CacheSize - 1];
for (int i = m_CacheSize - 1; i > 0; i--)
{
m_CacheOrder[i] = m_CacheOrder[i - 1];
} // for i - m_CacheOrder[]
m_CacheOrder[0] = Idx;
memcpy(m_CacheData[Idx].m_HeightMap, a_HeightMap, sizeof(a_HeightMap));
m_CacheData[Idx].m_ChunkX = a_ChunkX;
m_CacheData[Idx].m_ChunkZ = a_ChunkZ;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cHeiGenClassic:
cHeiGenClassic::cHeiGenClassic(int a_Seed, float a_HeightFreq1, float a_HeightAmp1, float a_HeightFreq2, float a_HeightAmp2, float a_HeightFreq3, float a_HeightAmp3) :
m_Seed(a_Seed),
m_Noise(a_Seed),
m_HeightFreq1(a_HeightFreq1),
m_HeightAmp1 (a_HeightAmp1),
m_HeightFreq2(a_HeightFreq2),
m_HeightAmp2 (a_HeightAmp2),
m_HeightFreq3(a_HeightFreq3),
m_HeightAmp3 (a_HeightAmp3)
{
// Nothing needed yet
}
float cHeiGenClassic::GetNoise(float x, float y)
{
float oct1 = m_Noise.CubicNoise2D(x * m_HeightFreq1, y * m_HeightFreq1) * m_HeightAmp1;
float oct2 = m_Noise.CubicNoise2D(x * m_HeightFreq2, y * m_HeightFreq2) * m_HeightAmp2;
float oct3 = m_Noise.CubicNoise2D(x * m_HeightFreq3, y * m_HeightFreq3) * m_HeightAmp3;
float height = m_Noise.CubicNoise2D(x * 0.1f, y * 0.1f ) * 2;
float flatness = ((m_Noise.CubicNoise2D(x * 0.5f, y * 0.5f) + 1.f) * 0.5f) * 1.1f; // 0 ... 1.5
flatness *= flatness * flatness;
return (oct1 + oct2 + oct3) * flatness + height;
}
void cHeiGenClassic::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
{
for (int z = 0; z < cChunkDef::Width; z++)
{
const float zz = (float)(a_ChunkZ * cChunkDef::Width + z);
for (int x = 0; x < cChunkDef::Width; x++)
{
const float xx = (float)(a_ChunkX * cChunkDef::Width + x);
int hei = 64 + (int)(GetNoise(xx * 0.05f, zz * 0.05f) * 16);
if (hei < 10)
{
hei = 10;
}
if (hei > 250)
{
hei = 250;
}
cChunkDef::SetHeight(a_HeightMap, x , z, hei);
} // for x
} // for z
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cHeiGenBiomal:
const cHeiGenBiomal::sGenParam cHeiGenBiomal::m_GenParam[biNumBiomes] =
{
/* Fast-changing | Middle-changing | Slow-changing |*/
/* Biome | Freq1 | Amp1 | Freq2 | Amp2 | Freq3 | Amp3 | BaseHeight */
/* biOcean */ { 0.1f, 2.0f, 0.05f, 12.0f, 0.01f, 10.0f, 40},
/* biPlains */ { 0.1f, 1.0f, 0.05f, 1.5f, 0.01f, 4.0f, 68},
/* biDesert */ { 0.1f, 1.0f, 0.05f, 1.5f, 0.01f, 4.0f, 68},
/* biExtremeHills */ { 0.2f, 4.0f, 0.05f, 20.0f, 0.01f, 16.0f, 100},
/* biForest */ { 0.1f, 1.0f, 0.05f, 2.0f, 0.01f, 4.0f, 70},
/* biTaiga */ { 0.1f, 1.0f, 0.05f, 2.0f, 0.01f, 4.0f, 70},
/* biSwampland */ { 0.1f, 1.1f, 0.05f, 1.5f, 0.02f, 2.5f, 61.5},
/* biRiver */ { 0.2f, 0.1f, 0.05f, 0.1f, 0.01f, 0.1f, 56},
/* biNether */ { 0.1f, 0.0f, 0.01f, 0.0f, 0.01f, 0.0f, 0}, // Unused, but must be here due to indexing
/* biSky */ { 0.1f, 0.0f, 0.01f, 0.0f, 0.01f, 0.0f, 0}, // Unused, but must be here due to indexing
/* biFrozenOcean */ { 0.1f, 2.0f, 0.05f, 12.0f, 0.01f, 10.0f, 40},
/* biFrozenRiver */ { 0.2f, 0.1f, 0.05f, 0.1f, 0.01f, 0.1f, 56},
/* biIcePlains */ { 0.1f, 1.0f, 0.05f, 1.5f, 0.01f, 4.0f, 68},
/* biIceMountains */ { 0.2f, 2.0f, 0.05f, 10.0f, 0.01f, 8.0f, 80},
/* biMushroomIsland */ { 0.1f, 2.0f, 0.05f, 8.0f, 0.01f, 6.0f, 80},
/* biMushroomShore */ { 0.1f, 1.0f, 0.05f, 2.0f, 0.01f, 4.0f, 64},
/* biBeach */ { 0.1f, 0.5f, 0.05f, 1.0f, 0.01f, 1.0f, 64},
/* biDesertHills */ { 0.2f, 2.0f, 0.05f, 5.0f, 0.01f, 4.0f, 75},
/* biForestHills */ { 0.2f, 2.0f, 0.05f, 12.0f, 0.01f, 10.0f, 80},
/* biTaigaHills */ { 0.2f, 2.0f, 0.05f, 12.0f, 0.01f, 10.0f, 80},
/* biExtremeHillsEdge */ { 0.2f, 3.0f, 0.05f, 16.0f, 0.01f, 12.0f, 80},
/* biJungle */ { 0.1f, 3.0f, 0.05f, 6.0f, 0.01f, 6.0f, 70},
/* biJungleHills */ { 0.2f, 3.0f, 0.05f, 12.0f, 0.01f, 10.0f, 80},
} ;
void cHeiGenBiomal::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
{
// Generate a 3x3 chunk area of biomes around this chunk:
BiomeNeighbors Biomes;
for (int z = -1; z <= 1; z++)
{
for (int x = -1; x <= 1; x++)
{
m_BiomeGen.GenBiomes(a_ChunkX + x, a_ChunkZ + z, Biomes[x + 1][z + 1]);
} // for x
} // for z
/*
_X 2013_04_22:
There's no point in precalculating the entire perlin noise arrays, too many values are calculated uselessly,
resulting in speed DEcrease.
*/
//*
// Linearly interpolate 4x4 blocks of heightmap:
// Must be done on a floating point datatype, else the results are ugly!
const int STEPZ = 4; // Must be a divisor of 16
const int STEPX = 4; // Must be a divisor of 16
NOISE_DATATYPE Height[17 * 17];
for (int z = 0; z < 17; z += STEPZ)
{
for (int x = 0; x < 17; x += STEPX)
{
Height[x + 17 * z] = GetHeightAt(x, z, a_ChunkX, a_ChunkZ, Biomes);
}
}
ArrayLinearInterpolate2D(Height, 17, 17, STEPX, STEPZ);
// Copy into the heightmap
for (int z = 0; z < cChunkDef::Width; z++)
{
for (int x = 0; x < cChunkDef::Width; x++)
{
cChunkDef::SetHeight(a_HeightMap, x, z, (int)Height[x + 17 * z]);
}
}
//*/
/*
// For each height, go through neighboring biomes and add up their idea of height:
for (int z = 0; z < cChunkDef::Width; z++)
{
for (int x = 0; x < cChunkDef::Width; x++)
{
cChunkDef::SetHeight(a_HeightMap, x, z, GetHeightAt(x, z, a_ChunkX, a_ChunkZ, Biomes));
} // for x
}
//*/
}
NOISE_DATATYPE cHeiGenBiomal::GetHeightAt(int a_RelX, int a_RelZ, int a_ChunkX, int a_ChunkZ, const cHeiGenBiomal::BiomeNeighbors & a_BiomeNeighbors)
{
// Sum up how many biomes of each type there are in the neighborhood:
int BiomeCounts[biNumBiomes];
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_BiomeNeighbors[IdxX][IdxZ], ModX, ModZ);
if ((Biome < 0) || (Biome >= ARRAYCOUNT(BiomeCounts)))
{
continue;
}
int WeightX = 9 - abs(x);
BiomeCounts[Biome] += WeightX + WeightZ;
Sum += WeightX + WeightZ;
} // for x
} // for z
// For each biome type that has a nonzero count, calc its height and add it:
if (Sum > 0)
{
NOISE_DATATYPE Height = 0;
int BlockX = a_ChunkX * cChunkDef::Width + a_RelX;
int BlockZ = a_ChunkZ * cChunkDef::Width + a_RelZ;
for (int i = 0; i < ARRAYCOUNT(BiomeCounts); i++)
{
if (BiomeCounts[i] == 0)
{
continue;
}
NOISE_DATATYPE oct1 = m_Noise.CubicNoise2D(BlockX * m_GenParam[i].m_HeightFreq1, BlockZ * m_GenParam[i].m_HeightFreq1) * m_GenParam[i].m_HeightAmp1;
NOISE_DATATYPE oct2 = m_Noise.CubicNoise2D(BlockX * m_GenParam[i].m_HeightFreq2, BlockZ * m_GenParam[i].m_HeightFreq2) * m_GenParam[i].m_HeightAmp2;
NOISE_DATATYPE oct3 = m_Noise.CubicNoise2D(BlockX * m_GenParam[i].m_HeightFreq3, BlockZ * m_GenParam[i].m_HeightFreq3) * m_GenParam[i].m_HeightAmp3;
Height += BiomeCounts[i] * (m_GenParam[i].m_BaseHeight + oct1 + oct2 + oct3);
}
NOISE_DATATYPE res = Height / Sum;
return std::min((NOISE_DATATYPE)250, std::max(res, (NOISE_DATATYPE)5));
}
// No known biome around? Weird. Return a bogus value:
ASSERT(!"cHeiGenBiomal: Biome sum failed, no known biome around");
return 5;
}
