120 lines
3.5 KiB
C++
120 lines
3.5 KiB
C++
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// TwoHeights.cpp
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// Implements the cTwoHeights class representing the terrain shape generator using two switched heightmaps
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#include "Globals.h"
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#include "TwoHeights.h"
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#include "../Noise/InterpolNoise.h"
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#include "HeiGen.h"
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#include "../LinearUpscale.h"
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#include "../IniFile.h"
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class cTwoHeights:
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public cTerrainShapeGen
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{
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using Super = cTerrainShapeGen;
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public:
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cTwoHeights(int a_Seed, cBiomeGen & a_BiomeGen):
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m_Seed(a_Seed),
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m_Choice(a_Seed),
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m_HeightA(a_Seed + 1, a_BiomeGen),
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m_HeightB(a_Seed + 2, a_BiomeGen)
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{
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}
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// cTerrainShapeGen override:
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virtual void GenShape(cChunkCoords a_ChunkCoords, cChunkDesc::Shape & a_Shape) override
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{
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// Generate the two heightmaps:
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cChunkDef::HeightMap heightsA;
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cChunkDef::HeightMap heightsB;
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m_HeightA.GenHeightMap(a_ChunkCoords, heightsA);
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m_HeightB.GenHeightMap(a_ChunkCoords, heightsB);
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// Generate the choice noise:
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NOISE_DATATYPE smallChoice[33 * 5 * 5];
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NOISE_DATATYPE workspace[33 * 5 * 5];
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NOISE_DATATYPE startX = 0;
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NOISE_DATATYPE endX = 256 * m_FrequencyY;
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NOISE_DATATYPE startY = a_ChunkCoords.m_ChunkX * cChunkDef::Width * m_FrequencyX;
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NOISE_DATATYPE endY = (a_ChunkCoords.m_ChunkX * cChunkDef::Width + cChunkDef::Width + 1) * m_FrequencyX;
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NOISE_DATATYPE startZ = a_ChunkCoords.m_ChunkZ * cChunkDef::Width * m_FrequencyZ;
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NOISE_DATATYPE endZ = (a_ChunkCoords.m_ChunkZ * cChunkDef::Width + cChunkDef::Width + 1) * m_FrequencyZ;
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m_Choice.Generate3D(smallChoice, 33, 5, 5, startX, endX, startY, endY, startZ, endZ, workspace);
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NOISE_DATATYPE choice[257 * 17 * 17];
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LinearUpscale3DArray(smallChoice, 33, 5, 5, choice, 8, 4, 4);
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// Generate the shape:
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int idxShape = 0;
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for (int z = 0; z < cChunkDef::Width; z++)
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{
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for (int x = 0; x < cChunkDef::Width; x++)
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{
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int idxChoice = 257 * 17 * z + 257 * x;
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NOISE_DATATYPE heightA = static_cast<NOISE_DATATYPE>(cChunkDef::GetHeight(heightsA, x, z));
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NOISE_DATATYPE heightB = static_cast<NOISE_DATATYPE>(cChunkDef::GetHeight(heightsB, x, z));
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for (int y = 0; y < cChunkDef::Height; y++)
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{
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int height = static_cast<int>(ClampedLerp(heightA, heightB, choice[idxChoice++]));
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a_Shape[idxShape++] = (y < height) ? 1 : 0;
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}
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} // for x
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} // for z
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}
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virtual void InitializeShapeGen(cIniFile & a_IniFile) override
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{
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m_FrequencyX = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "TwoHeightsFrequencyX", 40));
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m_FrequencyY = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "TwoHeightsFrequencyY", 40));
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m_FrequencyZ = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "TwoHeightsFrequencyZ", 40));
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// Initialize the two underlying height generators from an empty INI file:
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cIniFile empty;
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m_HeightA.InitializeHeightGen(empty);
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m_HeightB.InitializeHeightGen(empty);
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// Add the choice octaves:
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NOISE_DATATYPE freq = 0.001f;
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NOISE_DATATYPE ampl = 1;
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for (int i = 0; i < 4; i++)
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{
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m_Choice.AddOctave(freq, ampl);
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freq = freq * 2;
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ampl = ampl / 2;
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}
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}
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protected:
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int m_Seed;
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/** The noise used to decide between the two heightmaps. */
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cOctavedNoise<cInterpolNoise<Interp5Deg>> m_Choice;
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/** The first height generator. */
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cHeiGenBiomal m_HeightA;
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/** The second height generator. */
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cHeiGenBiomal m_HeightB;
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/** The base frequencies for m_Choice in each of the world axis directions. */
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NOISE_DATATYPE m_FrequencyX, m_FrequencyY, m_FrequencyZ;
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};
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std::unique_ptr<cTerrainShapeGen> CreateShapeGenTwoHeights(int a_Seed, cBiomeGen & a_BiomeGen)
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{
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return std::make_unique<cTwoHeights>(a_Seed, a_BiomeGen);
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}
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