92 lines
2.2 KiB
C++
92 lines
2.2 KiB
C++
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// HeiGen.cpp
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// Implements the various terrain height generators
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#include "Globals.h"
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#include "HeiGen.h"
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// cHeiGenFlat:
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void cHeiGenFlat::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
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{
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for (int i = 0; i < ARRAYCOUNT(a_HeightMap); i++)
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{
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a_HeightMap[i] = m_Height;
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// cHeiGenClassic:
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cHeiGenClassic::cHeiGenClassic(int a_Seed, float a_HeightFreq1, float a_HeightAmp1, float a_HeightFreq2, float a_HeightAmp2, float a_HeightFreq3, float a_HeightAmp3) :
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m_Seed(a_Seed),
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m_Noise(a_Seed),
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m_HeightFreq1(a_HeightFreq1),
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m_HeightAmp1 (a_HeightAmp1),
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m_HeightFreq2(a_HeightFreq2),
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m_HeightAmp2 (a_HeightAmp2),
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m_HeightFreq3(a_HeightFreq3),
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m_HeightAmp3 (a_HeightAmp3)
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{
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// Nothing needed yet
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}
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float cHeiGenClassic::GetNoise(float x, float y)
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{
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float oct1 = m_Noise.CubicNoise2D(x * m_HeightFreq1, y * m_HeightFreq1) * m_HeightAmp1;
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float oct2 = m_Noise.CubicNoise2D(x * m_HeightFreq2, y * m_HeightFreq2) * m_HeightAmp2;
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float oct3 = m_Noise.CubicNoise2D(x * m_HeightFreq3, y * m_HeightFreq3) * m_HeightAmp3;
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float height = m_Noise.CubicNoise2D(x * 0.1f, y * 0.1f ) * 2;
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float flatness = ((m_Noise.CubicNoise2D(x * 0.5f, y * 0.5f) + 1.f) * 0.5f) * 1.1f; // 0 ... 1.5
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flatness *= flatness * flatness;
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return (oct1 + oct2 + oct3) * flatness + height;
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}
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void cHeiGenClassic::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
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{
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for (int z = 0; z < cChunkDef::Width; z++)
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{
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const float zz = (float)(a_ChunkZ * cChunkDef::Width + z);
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for (int x = 0; x < cChunkDef::Width; x++)
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{
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const float xx = (float)(a_ChunkX * cChunkDef::Width + x);
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int hei = 64 + (int)(GetNoise(xx * 0.05f, zz * 0.05f) * 16);
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if (hei < 10)
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{
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hei = 10;
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}
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if (hei > 250)
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{
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hei = 250;
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}
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cChunkDef::SetHeight(a_HeightMap, x , z, hei);
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} // for x
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} // for z
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}
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