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Optimized BioGen-MultiStepMap's performance by using linear interpolation, about 25 % increase in total chunk generation speed. 

git-svn-id: http://mc-server.googlecode.com/svn/trunk@1289 0a769ca7-a7f5-676a-18bf-c427514a06d6
This commit is contained in:
madmaxoft@gmail.com 2013-03-19 15:10:00 +00:00
parent 387135cdc3
commit b3b96d645e
2 changed files with 11 additions and 6 deletions
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15
source/Generating/BioGen.cpp
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@ -595,24 +595,27 @@ void cBioGenMultiStepMap::Distort(int a_BlockX, int a_BlockZ, int & a_DistortedX
void cBioGenMultiStepMap::BuildTemperatureHumidityMaps(int a_ChunkX, int a_ChunkZ, IntMap & a_TemperatureMap, IntMap & a_HumidityMap)
{
for (int z = 0; z < cChunkDef::Width; z++)
// Linear interpolation over 8x8 blocks
for (int z = 0; z < 17; z += 8)
{
float NoiseCoordZ = (float)(a_ChunkZ * cChunkDef::Width + z) / m_LandBiomesSize;
for (int x = 0; x < cChunkDef::Width; x++)
for (int x = 0; x < 17; x += 8)
{
float NoiseCoordX = (float)(a_ChunkX * cChunkDef::Width + x) / m_LandBiomesSize;
double NoiseT = m_Noise.CubicNoise3D( NoiseCoordX, NoiseCoordZ, 7000);
NoiseT += 0.5 * m_Noise.CubicNoise3D(2 * NoiseCoordX, 2 * NoiseCoordZ, 8000);
NoiseT += 0.1 * m_Noise.CubicNoise3D(8 * NoiseCoordX, 8 * NoiseCoordZ, 9000);
a_TemperatureMap[x + 16 * z] = std::max(0, std::min(255, (int)(128 + NoiseT * 128)));
a_TemperatureMap[x + 17 * z] = std::max(0, std::min(255, (int)(128 + NoiseT * 128)));
double NoiseH = m_Noise.CubicNoise3D( NoiseCoordX, NoiseCoordZ, 9000);
NoiseH += 0.5 * m_Noise.CubicNoise3D(2 * NoiseCoordX, 2 * NoiseCoordZ, 5000);
NoiseH += 0.1 * m_Noise.CubicNoise3D(8 * NoiseCoordX, 8 * NoiseCoordZ, 1000);
a_HumidityMap[x + 16 * z] = std::max(0, std::min(255, (int)(128 + NoiseH * 128)));
a_HumidityMap[x + 17 * z] = std::max(0, std::min(255, (int)(128 + NoiseH * 128)));
} // for x
} // for z
IntArrayLinearInterpolate2D(a_TemperatureMap, 17, 17, 8, 8);
IntArrayLinearInterpolate2D(a_HumidityMap, 17, 17, 8, 8);
}
@ -643,6 +646,7 @@ void cBioGenMultiStepMap::DecideLandBiomes(cChunkDef::BiomeMap & a_BiomeMap, con
} ;
for (int z = 0; z < cChunkDef::Width; z++)
{
int idxZ = 17 * z;
for (int x = 0; x < cChunkDef::Width; x++)
{
if (cChunkDef::GetBiome(a_BiomeMap, x, z) != -1)
@ -650,7 +654,7 @@ void cBioGenMultiStepMap::DecideLandBiomes(cChunkDef::BiomeMap & a_BiomeMap, con
// Already set before
continue;
}
int idx = x + 16 * z;
int idx = idxZ + x;
int Temperature = a_TemperatureMap[idx] / 16; // -> [0..15] range
int Humidity = a_HumidityMap[idx] / 16; // -> [0..15] range
cChunkDef::SetBiome(a_BiomeMap, x, z, BiomeMap[Temperature + 16 * Humidity]);
@ -680,6 +684,7 @@ void cBioGenMultiStepMap::FreezeWaterBiomes(cChunkDef::BiomeMap & a_BiomeMap, co
case biOcean: cChunkDef::SetBiome(a_BiomeMap, x, z, biFrozenOcean); break;
}
} // for x
idx += 1;
} // for z
}

2
source/Generating/BioGen.h
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@ -183,7 +183,7 @@ protected:
float m_RiverWidthThreshold;
float m_LandBiomesSize;
typedef int IntMap[256]; // x + 16 * z, expected trimmed into [0..255] range
typedef int IntMap[17 * 17]; // x + 17 * z, expected trimmed into [0..255] range
// cBiomeGen overrides:
virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;