From 675b4aa878f16291ce33fced48a2bc7425f635ae Mon Sep 17 00:00:00 2001 From: Alexander Harkness Date: Sun, 24 Nov 2013 14:19:41 +0000 Subject: Moved source to src --- src/Generating/DistortedHeightmap.cpp | 444 ++++++++++++++++++++++++++++++++++ 1 file changed, 444 insertions(+) create mode 100644 src/Generating/DistortedHeightmap.cpp (limited to 'src/Generating/DistortedHeightmap.cpp') diff --git a/src/Generating/DistortedHeightmap.cpp b/src/Generating/DistortedHeightmap.cpp new file mode 100644 index 000000000..98eab31b5 --- /dev/null +++ b/src/Generating/DistortedHeightmap.cpp @@ -0,0 +1,444 @@ + +// DistortedHeightmap.cpp + +// Implements the cDistortedHeightmap class representing the height and composition generator capable of overhangs + +#include "Globals.h" + +#include "DistortedHeightmap.h" +#include "../OSSupport/File.h" +#include "../../iniFile/iniFile.h" +#include "../LinearUpscale.h" + + + + + +/** This table assigns a relative maximum overhang size in each direction to biomes. +Both numbers indicate a number which will multiply the noise value for each coord; +this means that you can have different-sized overhangs in each direction. +Usually you'd want to keep both numbers the same. +The numbers are "relative", not absolute maximum; overhangs of a slightly larger size are possible +due to the way that noise is calculated. +*/ +const cDistortedHeightmap::sGenParam cDistortedHeightmap::m_GenParam[biNumBiomes] = +{ + /* Biome | AmpX | AmpZ */ + /* biOcean */ { 1.5f, 1.5f}, + /* biPlains */ { 0.5f, 0.5f}, + /* biDesert */ { 0.5f, 0.5f}, + /* biExtremeHills */ {16.0f, 16.0f}, + /* biForest */ { 3.0f, 3.0f}, + /* biTaiga */ { 1.5f, 1.5f}, + + /* biSwampland */ { 0.0f, 0.0f}, + /* biRiver */ { 0.0f, 0.0f}, + /* biNether */ { 0.0f, 0.0f}, // Unused, but must be here due to indexing + /* biSky */ { 0.0f, 0.0f}, // Unused, but must be here due to indexing + /* biFrozenOcean */ { 0.0f, 0.0f}, + /* biFrozenRiver */ { 0.0f, 0.0f}, + /* biIcePlains */ { 0.0f, 0.0f}, + /* biIceMountains */ { 8.0f, 8.0f}, + /* biMushroomIsland */ { 4.0f, 4.0f}, + /* biMushroomShore */ { 0.0f, 0.0f}, + /* biBeach */ { 0.0f, 0.0f}, + /* biDesertHills */ { 5.0f, 5.0f}, + /* biForestHills */ { 6.0f, 6.0f}, + /* biTaigaHills */ { 8.0f, 8.0f}, + /* biExtremeHillsEdge */ { 7.0f, 7.0f}, + /* biJungle */ { 0.0f, 0.0f}, + /* biJungleHills */ { 8.0f, 8.0f}, +} ; + + + + + +cDistortedHeightmap::cDistortedHeightmap(int a_Seed, cBiomeGen & a_BiomeGen) : + m_NoiseDistortX(a_Seed + 1000), + m_NoiseDistortZ(a_Seed + 2000), + m_OceanFloorSelect(a_Seed + 3000), + m_BiomeGen(a_BiomeGen), + m_UnderlyingHeiGen(a_Seed, a_BiomeGen), + m_HeightGen(m_UnderlyingHeiGen, 64) +{ + m_NoiseDistortX.AddOctave((NOISE_DATATYPE)1, (NOISE_DATATYPE)0.5); + m_NoiseDistortX.AddOctave((NOISE_DATATYPE)0.5, (NOISE_DATATYPE)1); + m_NoiseDistortX.AddOctave((NOISE_DATATYPE)0.25, (NOISE_DATATYPE)2); + + m_NoiseDistortZ.AddOctave((NOISE_DATATYPE)1, (NOISE_DATATYPE)0.5); + m_NoiseDistortZ.AddOctave((NOISE_DATATYPE)0.5, (NOISE_DATATYPE)1); + m_NoiseDistortZ.AddOctave((NOISE_DATATYPE)0.25, (NOISE_DATATYPE)2); +} + + + + + +void cDistortedHeightmap::Initialize(cIniFile & a_IniFile) +{ + if (m_IsInitialized) + { + return; + } + + // Read the params from the INI file: + m_SeaLevel = a_IniFile.GetValueSetI("Generator", "DistortedHeightmapSeaLevel", 62); + m_FrequencyX = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "DistortedHeightmapFrequencyX", 10); + m_FrequencyY = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "DistortedHeightmapFrequencyY", 10); + m_FrequencyZ = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "DistortedHeightmapFrequencyZ", 10); + + m_IsInitialized = true; +} + + + + + +void cDistortedHeightmap::PrepareState(int a_ChunkX, int a_ChunkZ) +{ + if ((m_CurChunkX == a_ChunkX) && (m_CurChunkZ == a_ChunkZ)) + { + return; + } + m_CurChunkX = a_ChunkX; + m_CurChunkZ = a_ChunkZ; + + + m_HeightGen.GenHeightMap(a_ChunkX, a_ChunkZ, m_CurChunkHeights); + UpdateDistortAmps(); + GenerateHeightArray(); +} + + + + + +void cDistortedHeightmap::GenerateHeightArray(void) +{ + // Generate distortion noise: + NOISE_DATATYPE DistortNoiseX[DIM_X * DIM_Y * DIM_Z]; + NOISE_DATATYPE DistortNoiseZ[DIM_X * DIM_Y * DIM_Z]; + NOISE_DATATYPE Workspace[DIM_X * DIM_Y * DIM_Z]; + NOISE_DATATYPE StartX = ((NOISE_DATATYPE)(m_CurChunkX * cChunkDef::Width)) / m_FrequencyX; + NOISE_DATATYPE EndX = ((NOISE_DATATYPE)((m_CurChunkX + 1) * cChunkDef::Width - 1)) / m_FrequencyX; + NOISE_DATATYPE StartY = 0; + NOISE_DATATYPE EndY = ((NOISE_DATATYPE)(257)) / m_FrequencyY; + NOISE_DATATYPE StartZ = ((NOISE_DATATYPE)(m_CurChunkZ * cChunkDef::Width)) / m_FrequencyZ; + NOISE_DATATYPE EndZ = ((NOISE_DATATYPE)((m_CurChunkZ + 1) * cChunkDef::Width - 1)) / m_FrequencyZ; + + m_NoiseDistortX.Generate3D(DistortNoiseX, DIM_X, DIM_Y, DIM_Z, StartX, EndX, StartY, EndY, StartZ, EndZ, Workspace); + m_NoiseDistortZ.Generate3D(DistortNoiseZ, DIM_X, DIM_Y, DIM_Z, StartX, EndX, StartY, EndY, StartZ, EndZ, Workspace); + + // The distorted heightmap, before linear upscaling + NOISE_DATATYPE DistHei[DIM_X * DIM_Y * DIM_Z]; + + // Distort the heightmap using the distortion: + for (int z = 0; z < DIM_Z; z++) + { + int AmpIdx = z * DIM_X; + for (int y = 0; y < DIM_Y; y++) + { + int NoiseArrayIdx = z * DIM_X * DIM_Y + y * DIM_X; + for (int x = 0; x < DIM_X; x++) + { + NOISE_DATATYPE DistX = DistortNoiseX[NoiseArrayIdx + x] * m_DistortAmpX[AmpIdx + x]; + NOISE_DATATYPE DistZ = DistortNoiseZ[NoiseArrayIdx + x] * m_DistortAmpZ[AmpIdx + x]; + DistX += (NOISE_DATATYPE)(m_CurChunkX * cChunkDef::Width + x * INTERPOL_X); + DistZ += (NOISE_DATATYPE)(m_CurChunkZ * cChunkDef::Width + z * INTERPOL_Z); + // Adding 0.5 helps alleviate the interpolation artifacts + DistHei[NoiseArrayIdx + x] = (NOISE_DATATYPE)GetHeightmapAt(DistX, DistZ) + (NOISE_DATATYPE)0.5; + } + } + } + + // Upscale the distorted heightmap into full dimensions: + LinearUpscale3DArray( + DistHei, DIM_X, DIM_Y, DIM_Z, + m_DistortedHeightmap, INTERPOL_X, INTERPOL_Y, INTERPOL_Z + ); + + // DEBUG: Debug3DNoise(m_DistortedHeightmap, 17, 257, 17, Printf("DistortedHeightmap_%d_%d", m_CurChunkX, m_CurChunkZ)); +} + + + + + +void cDistortedHeightmap::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) +{ + PrepareState(a_ChunkX, a_ChunkZ); + for (int z = 0; z < cChunkDef::Width; z++) + { + for (int x = 0; x < cChunkDef::Width; x++) + { + int NoiseArrayIdx = x + 17 * 257 * z; + cChunkDef::SetHeight(a_HeightMap, x, z, m_SeaLevel - 1); + for (int y = cChunkDef::Height - 1; y > m_SeaLevel - 1; y--) + { + int HeightMapHeight = (int)m_DistortedHeightmap[NoiseArrayIdx + 17 * y]; + if (y < HeightMapHeight) + { + cChunkDef::SetHeight(a_HeightMap, x, z, y); + break; + } + } // for y + } // for x + } // for z +} + + + + + +void cDistortedHeightmap::InitializeHeightGen(cIniFile & a_IniFile) +{ + Initialize(a_IniFile); +} + + + + + +void cDistortedHeightmap::ComposeTerrain(cChunkDesc & a_ChunkDesc) +{ + // Frequencies for the ocean floor selecting noise: + NOISE_DATATYPE FrequencyX = 3; + NOISE_DATATYPE FrequencyZ = 3; + + // Prepare the internal state for generating this chunk: + PrepareState(a_ChunkDesc.GetChunkX(), a_ChunkDesc.GetChunkZ()); + + // Compose: + a_ChunkDesc.FillBlocks(E_BLOCK_AIR, 0); + for (int z = 0; z < cChunkDef::Width; z++) + { + for (int x = 0; x < cChunkDef::Width; x++) + { + int NoiseArrayIdx = x + 17 * 257 * z; + int LastAir = a_ChunkDesc.GetHeight(x, z) + 1; + bool HasHadWater = false; + for (int y = LastAir - 1; y > 0; y--) + { + int HeightMapHeight = (int)m_DistortedHeightmap[NoiseArrayIdx + 17 * y]; + + if (y >= HeightMapHeight) + { + // "air" part + LastAir = y; + if (y < m_SeaLevel) + { + a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_STATIONARY_WATER); + HasHadWater = true; + } + continue; + } + // "ground" part: + if (y < LastAir - 4) + { + a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_STONE); + continue; + } + if (HasHadWater) + { + // Decide between clay, sand and dirt + NOISE_DATATYPE NoiseX = ((NOISE_DATATYPE)(m_CurChunkX * cChunkDef::Width + x)) / FrequencyX; + NOISE_DATATYPE NoiseY = ((NOISE_DATATYPE)(m_CurChunkZ * cChunkDef::Width + z)) / FrequencyZ; + NOISE_DATATYPE Val = m_OceanFloorSelect.CubicNoise2D(NoiseX, NoiseY); + if (Val < -0.95) + { + // Clay: + switch (LastAir - y) + { + case 0: + case 1: + { + a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_CLAY); + break; + } + case 2: + case 3: + { + a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_SAND); + break; + } + case 4: + { + a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_SANDSTONE); + break; + } + } // switch (floor depth) + } + else if (Val < 0) + { + a_ChunkDesc.SetBlockType(x, y, z, (y < LastAir - 3) ? E_BLOCK_SANDSTONE : E_BLOCK_SAND); + } + else + { + a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_DIRT); + } + } + else + { + switch (a_ChunkDesc.GetBiome(x, z)) + { + case biOcean: + case biPlains: + case biExtremeHills: + case biForest: + case biTaiga: + case biSwampland: + case biRiver: + case biFrozenOcean: + case biFrozenRiver: + case biIcePlains: + case biIceMountains: + case biForestHills: + case biTaigaHills: + case biExtremeHillsEdge: + case biJungle: + case biJungleHills: + { + a_ChunkDesc.SetBlockType(x, y, z, (y == LastAir - 1) ? E_BLOCK_GRASS : E_BLOCK_DIRT); + break; + } + case biDesertHills: + case biDesert: + case biBeach: + { + a_ChunkDesc.SetBlockType(x, y, z, (y < LastAir - 3) ? E_BLOCK_SANDSTONE : E_BLOCK_SAND); + break; + } + case biMushroomIsland: + case biMushroomShore: + { + a_ChunkDesc.SetBlockType(x, y, z, (y == LastAir - 1) ? E_BLOCK_MYCELIUM : E_BLOCK_DIRT); + break; + } + } + } + } // for y + a_ChunkDesc.SetBlockType(x, 0, z, E_BLOCK_BEDROCK); + } // for x + } // for z +} + + + + + +void cDistortedHeightmap::InitializeCompoGen(cIniFile & a_IniFile) +{ + Initialize(a_IniFile); +} + + + + + +int cDistortedHeightmap::GetHeightmapAt(NOISE_DATATYPE a_X, NOISE_DATATYPE a_Z) +{ + int ChunkX = (int)floor(a_X / (NOISE_DATATYPE)16); + int ChunkZ = (int)floor(a_Z / (NOISE_DATATYPE)16); + int RelX = (int)(a_X - (NOISE_DATATYPE)ChunkX * cChunkDef::Width); + int RelZ = (int)(a_Z - (NOISE_DATATYPE)ChunkZ * cChunkDef::Width); + + // If we're withing the same chunk, return the pre-cached heightmap: + if ((ChunkX == m_CurChunkX) && (ChunkZ == m_CurChunkZ)) + { + return cChunkDef::GetHeight(m_CurChunkHeights, RelX, RelZ); + } + + // Ask the cache: + HEIGHTTYPE res = 0; + if (m_HeightGen.GetHeightAt(ChunkX, ChunkZ, RelX, RelZ, res)) + { + // The height was in the cache + return res; + } + + // The height is not in the cache, generate full heightmap and get it there: + cChunkDef::HeightMap Heightmap; + m_HeightGen.GenHeightMap(ChunkX, ChunkZ, Heightmap); + return cChunkDef::GetHeight(Heightmap, RelX, RelZ); +} + + + + + +void cDistortedHeightmap::UpdateDistortAmps(void) +{ + BiomeNeighbors Biomes; + for (int z = -1; z <= 1; z++) + { + for (int x = -1; x <= 1; x++) + { + m_BiomeGen.GenBiomes(m_CurChunkX + x, m_CurChunkZ + z, Biomes[x + 1][z + 1]); + } // for x + } // for z + + for (int z = 0; z < DIM_Z; z++) + { + for (int x = 0; x < DIM_Z; x++) + { + GetDistortAmpsAt(Biomes, x * INTERPOL_X, z * INTERPOL_Z, m_DistortAmpX[x + DIM_X * z], m_DistortAmpZ[x + DIM_X * z]); + } + } +} + + + + + +void cDistortedHeightmap::GetDistortAmpsAt(BiomeNeighbors & a_Neighbors, int a_RelX, int a_RelZ, NOISE_DATATYPE & a_DistortAmpX, NOISE_DATATYPE & a_DistortAmpZ) +{ + // 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_Neighbors[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 + + if (Sum <= 0) + { + // No known biome around? Weird. Return a bogus value: + ASSERT(!"cHeiGenBiomal: Biome sum failed, no known biome around"); + a_DistortAmpX = 16; + a_DistortAmpZ = 16; + } + + // For each biome type that has a nonzero count, calc its amps and add it: + NOISE_DATATYPE AmpX = 0; + NOISE_DATATYPE AmpZ = 0; + for (int i = 0; i < ARRAYCOUNT(BiomeCounts); i++) + { + AmpX += BiomeCounts[i] * m_GenParam[i].m_DistortAmpX; + AmpZ += BiomeCounts[i] * m_GenParam[i].m_DistortAmpZ; + } + a_DistortAmpX = AmpX / Sum; + a_DistortAmpZ = AmpZ / Sum; +} + + + + -- cgit v1.2.3