From bd910e78e274ade7721e9674a1dd73825c2d2d7e Mon Sep 17 00:00:00 2001 From: "madmaxoft@gmail.com" Date: Thu, 16 May 2013 13:14:25 +0000 Subject: DistortedHeightmap: Rewritten to use the optimized cPerlinNoise and linear upscaling git-svn-id: http://mc-server.googlecode.com/svn/trunk@1486 0a769ca7-a7f5-676a-18bf-c427514a06d6 --- source/Generating/DistortedHeightmap.cpp | 161 +++++++++---------------------- source/Generating/DistortedHeightmap.h | 24 +++-- 2 files changed, 64 insertions(+), 121 deletions(-) (limited to 'source/Generating') diff --git a/source/Generating/DistortedHeightmap.cpp b/source/Generating/DistortedHeightmap.cpp index 9d60c0a92..b81db61cc 100644 --- a/source/Generating/DistortedHeightmap.cpp +++ b/source/Generating/DistortedHeightmap.cpp @@ -55,15 +55,19 @@ const cDistortedHeightmap::sGenParam cDistortedHeightmap::m_GenParam[biNumBiomes cDistortedHeightmap::cDistortedHeightmap(int a_Seed, cBiomeGen & a_BiomeGen) : - m_Noise1(a_Seed + 1000), - m_Noise2(a_Seed + 2000), - m_Noise3(a_Seed + 3000), - m_Noise4(a_Seed + 4000), - m_Noise5(a_Seed + 5000), + m_NoiseDistortX(a_Seed + 1000), + m_NoiseDistortZ(a_Seed + 2000), 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); } @@ -104,113 +108,49 @@ void cDistortedHeightmap::PrepareState(int a_ChunkX, int a_ChunkZ) void cDistortedHeightmap::GenerateHeightArray(void) { - // Parameters: - static const int INTERPOL_X = 8; - static const int INTERPOL_Y = 4; - static const int INTERPOL_Z = 8; - static const int DIM_X = 1 + (17 / INTERPOL_X); - static const int DIM_Y = 1 + (257 / INTERPOL_Y); - static const int DIM_Z = 1 + (17 / INTERPOL_Z); - NOISE_DATATYPE DistortNoiseX[DIM_X * DIM_Z * DIM_Y]; - NOISE_DATATYPE DistortNoiseZ[DIM_X * DIM_Z * DIM_Y]; - - // TODO: This triple-loop should really be moved into the cPerlinNoise class for optimization - int idx = 0; - for (int y = 0; y < DIM_Y; y++) - { - NOISE_DATATYPE NoiseY = ((NOISE_DATATYPE)(y * INTERPOL_X)) / m_FrequencyY; - for (int z = 0; z < DIM_Z; z++) - { - NOISE_DATATYPE NoiseZ = ((NOISE_DATATYPE)(m_CurChunkZ * cChunkDef::Width + z * INTERPOL_Z)) / m_FrequencyZ; - for (int x = 0; x < DIM_X; x++) - { - NOISE_DATATYPE NoiseX = ((NOISE_DATATYPE)(m_CurChunkX * cChunkDef::Width + x * INTERPOL_X)) / m_FrequencyX; - DistortNoiseX[idx] = - m_Noise1.CubicNoise3D(NoiseX, NoiseY, NoiseZ) * (NOISE_DATATYPE)0.5 + - m_Noise2.CubicNoise3D(NoiseX / 2, NoiseY / 2, NoiseZ / 2) + - m_Noise3.CubicNoise3D(NoiseX / 4, NoiseY / 4, NoiseZ / 4) * 2; - - DistortNoiseZ[idx] = - m_Noise3.CubicNoise3D(NoiseX, NoiseY, NoiseZ) * (NOISE_DATATYPE)0.5 + - m_Noise2.CubicNoise3D(NoiseX / 2, NoiseY / 2, NoiseZ / 2) + - m_Noise1.CubicNoise3D(NoiseX / 4, NoiseY / 4, NoiseZ / 4) * 2; - idx += 1; - } // for x - } // for z - } // for y + // 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; - // Convert from distortion into real height values: - for (int y = 0; y < DIM_Y; y++) + 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++) { - NOISE_DATATYPE * CurFloor = m_DistortedHeightmap + 17 * 17 * y * INTERPOL_Y; - for (int z = 0; z < DIM_Z; z++) + int AmpIdx = z * DIM_X; + for (int y = 0; y < DIM_Y; y++) { - int idx = 17 * z * INTERPOL_Z; - int AmpIdx = 17 * z * INTERPOL_Z; - int NoiseArrayIdx = z * DIM_X + y * DIM_X * DIM_Z; + 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 * INTERPOL_X]; - NOISE_DATATYPE DistZ = DistortNoiseZ[NoiseArrayIdx + x] * m_DistortAmpZ[AmpIdx + x * INTERPOL_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 - CurFloor[idx + x * INTERPOL_X] = (NOISE_DATATYPE)GetHeightmapAt(DistX, DistZ) + (NOISE_DATATYPE)0.5; - } // for x - } // for z - LinearUpscale2DArrayInPlace(CurFloor, 17, 17, INTERPOL_X, INTERPOL_Z); - } // for y - - // Finish the 3D linear interpolation by interpolating between each XZ-floors on the Y axis - for (int y = 1; y < cChunkDef::Height; y++) - { - if ((y % INTERPOL_Y) == 0) - { - // This is the interpolation source floor, already calculated - continue; - } - int LoFloorY = (y / INTERPOL_Y) * INTERPOL_Y; - int HiFloorY = LoFloorY + INTERPOL_Y; - NOISE_DATATYPE * LoFloor = &(m_DistortedHeightmap[LoFloorY * 17 * 17]); - NOISE_DATATYPE * HiFloor = &(m_DistortedHeightmap[HiFloorY * 17 * 17]); - NOISE_DATATYPE * CurFloor = &(m_DistortedHeightmap[y * 17 * 17]); - NOISE_DATATYPE Ratio = ((NOISE_DATATYPE)(y % INTERPOL_Y)) / INTERPOL_Y; - int idx = 0; - for (int z = 0; z < cChunkDef::Width; z++) - { - for (int x = 0; x < cChunkDef::Width; x++) - { - CurFloor[idx] = LoFloor[idx] + (HiFloor[idx] - LoFloor[idx]) * Ratio; - idx += 1; + DistHei[NoiseArrayIdx + x] = (NOISE_DATATYPE)GetHeightmapAt(DistX, DistZ) + (NOISE_DATATYPE)0.5; } - idx += 1; // Skipping one X column - } // for z - } // for y - - /* - // DEBUG: Dump the distorted heightmap to a file for visual inspection - cFile f; - if (f.Open(Printf("DistortedHeightmap_%d_%d.grab", m_CurChunkX, m_CurChunkZ), cFile::fmWrite)) - { - for (int z = 0; z < cChunkDef::Width; z++) - { - for (int y = cChunkDef::Height - 1; y >= 0; y--) - { - unsigned char Line[cChunkDef::Width]; - int idx = z * 17 + y * 17 * 17; - for (int x = 0; x < cChunkDef::Width; x++) - { - Line[x] = (unsigned char)m_DistortedHeightmap[idx + x]; - } - f.Write(Line, sizeof(Line)); - } // for y - unsigned char Interrupt[2 * cChunkDef::Width]; - memset(Interrupt, 0, cChunkDef::Width); - memset(Interrupt + cChunkDef::Width, 0xff, cChunkDef::Width); - f.Write(Interrupt, sizeof(Interrupt)); } } - //*/ + + // 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)); } @@ -224,11 +164,11 @@ void cDistortedHeightmap::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::He { for (int x = 0; x < cChunkDef::Width; x++) { - int NoiseArrayIdx = x + 17 * z; + 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 * 17 * y]; + int HeightMapHeight = (int)m_DistortedHeightmap[NoiseArrayIdx + 17 * y]; if (y < HeightMapHeight) { cChunkDef::SetHeight(a_HeightMap, x, z, y); @@ -251,12 +191,12 @@ void cDistortedHeightmap::ComposeTerrain(cChunkDesc & a_ChunkDesc) { for (int x = 0; x < cChunkDef::Width; x++) { - int NoiseArrayIdx = x + 17 * z; + 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 * 17 * y]; + int HeightMapHeight = (int)m_DistortedHeightmap[NoiseArrayIdx + 17 * y]; if (y >= HeightMapHeight) { @@ -371,18 +311,13 @@ void cDistortedHeightmap::UpdateDistortAmps(void) } // for x } // for z - // Linearly interpolate 4x4 blocks of Amps: - const int STEPZ = 4; // Must be a divisor of 16 - const int STEPX = 4; // Must be a divisor of 16 - for (int z = 0; z < 17; z += STEPZ) + for (int z = 0; z < DIM_Z; z++) { - for (int x = 0; x < 17; x += STEPX) + for (int x = 0; x < DIM_Z; x++) { - GetDistortAmpsAt(Biomes, x, z, m_DistortAmpX[x + 17 * z], m_DistortAmpZ[x + 17 * z]); + GetDistortAmpsAt(Biomes, x * INTERPOL_X, z * INTERPOL_Z, m_DistortAmpX[x + DIM_X * z], m_DistortAmpZ[x + DIM_X * z]); } } - LinearUpscale2DArrayInPlace(m_DistortAmpX, 17, 17, STEPX, STEPZ); - LinearUpscale2DArrayInPlace(m_DistortAmpZ, 17, 17, STEPX, STEPZ); } diff --git a/source/Generating/DistortedHeightmap.h b/source/Generating/DistortedHeightmap.h index 2b962940a..9027b609a 100644 --- a/source/Generating/DistortedHeightmap.h +++ b/source/Generating/DistortedHeightmap.h @@ -35,11 +35,18 @@ public: protected: typedef cChunkDef::BiomeMap BiomeNeighbors[3][3]; - cNoise m_Noise1; - cNoise m_Noise2; - cNoise m_Noise3; - cNoise m_Noise4; - cNoise m_Noise5; + // Linear upscaling step sizes, must be divisors of cChunkDef::Width and cChunkDef::Height, respectively: + static const int INTERPOL_X = 8; + static const int INTERPOL_Y = 4; + static const int INTERPOL_Z = 8; + + // Linear upscaling buffer dimensions, calculated from the step sizes: + static const int DIM_X = 1 + (17 / INTERPOL_X); + static const int DIM_Y = 1 + (257 / INTERPOL_Y); + static const int DIM_Z = 1 + (17 / INTERPOL_Z); + + cPerlinNoise m_NoiseDistortX; + cPerlinNoise m_NoiseDistortZ; int m_SeaLevel; NOISE_DATATYPE m_FrequencyX; @@ -48,7 +55,7 @@ protected: int m_CurChunkX; int m_CurChunkZ; - NOISE_DATATYPE m_DistortedHeightmap[17 * 17 * 257]; + NOISE_DATATYPE m_DistortedHeightmap[17 * 257 * 17]; cBiomeGen & m_BiomeGen; cHeiGenBiomal m_UnderlyingHeiGen; // This generator provides us with base heightmap (before distortion) @@ -65,8 +72,9 @@ protected: } ; static const sGenParam m_GenParam[biNumBiomes]; - NOISE_DATATYPE m_DistortAmpX[17 * 17]; - NOISE_DATATYPE m_DistortAmpZ[17 * 17]; + // Distortion amplitudes for each direction, before linear upscaling + NOISE_DATATYPE m_DistortAmpX[DIM_X * DIM_Z]; + NOISE_DATATYPE m_DistortAmpZ[DIM_X * DIM_Z]; /// Unless the LastChunk coords are equal to coords given, prepares the internal state (noise arrays, heightmap) -- cgit v1.2.3