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authorTiger Wang <ziwei.tiger@hotmail.co.uk>2014-11-26 00:03:33 +0100
committerTiger Wang <ziwei.tiger@hotmail.co.uk>2014-11-26 00:03:33 +0100
commit187bdab4fa90fbfa5b1979ea529dc9c0deac89d9 (patch)
treece15b54701666b6f5ecd9563df8b7103d88c29b0 /src/Generating/TwoHeights.cpp
parentRemoved unnecessary #includes (diff)
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diff --git a/src/Generating/TwoHeights.cpp b/src/Generating/TwoHeights.cpp
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+
+// TwoHeights.cpp
+
+// Implements the cTwoHeights class representing the terrain shape generator using two switched heightmaps
+
+#include "Globals.h"
+#include "TwoHeights.h"
+#include "../Noise/InterpolNoise.h"
+#include "HeiGen.h"
+#include "../LinearUpscale.h"
+#include "../IniFile.h"
+
+
+
+
+
+class cTwoHeights:
+ public cTerrainShapeGen
+{
+ typedef cTerrainShapeGen super;
+public:
+ cTwoHeights(int a_Seed, cBiomeGenPtr a_BiomeGen):
+ m_Seed(a_Seed),
+ m_Choice(a_Seed),
+ m_HeightA(a_Seed + 1, a_BiomeGen),
+ m_HeightB(a_Seed + 2, a_BiomeGen)
+ {
+ }
+
+
+ // 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
+ }
+
+
+ virtual void InitializeShapeGen(cIniFile & a_IniFile)
+ {
+ m_FrequencyX = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "TwoHeightsFrequencyX", 40));
+ m_FrequencyY = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "TwoHeightsFrequencyY", 40));
+ m_FrequencyZ = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "TwoHeightsFrequencyZ", 40));
+
+ // Initialize the two underlying height generators from an empty INI file:
+ cIniFile empty;
+ m_HeightA.InitializeHeightGen(empty);
+ m_HeightB.InitializeHeightGen(empty);
+
+ // Add the choice octaves:
+ NOISE_DATATYPE freq = 0.001f;
+ NOISE_DATATYPE ampl = 1;
+ for (int i = 0; i < 4; i++)
+ {
+ m_Choice.AddOctave(freq, ampl);
+ freq = freq * 2;
+ ampl = ampl / 2;
+ }
+ }
+
+protected:
+ int m_Seed;
+
+ /** The noise used to decide between the two heightmaps. */
+ cOctavedNoise<cInterpolNoise<Interp5Deg>> m_Choice;
+
+ /** The first height generator. */
+ cHeiGenBiomal m_HeightA;
+
+ /** The second height generator. */
+ cHeiGenBiomal m_HeightB;
+
+ /** The base frequencies for m_Choice in each of the world axis directions. */
+ NOISE_DATATYPE m_FrequencyX, m_FrequencyY, m_FrequencyZ;
+};
+
+
+
+
+
+cTerrainShapeGenPtr CreateShapeGenTwoHeights(int a_Seed, cBiomeGenPtr a_BiomeGen)
+{
+ return std::make_shared<cTwoHeights>(a_Seed, a_BiomeGen);
+}
+
+
+
+