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/Ravines.cpp | 531 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 531 insertions(+) create mode 100644 src/Generating/Ravines.cpp (limited to 'src/Generating/Ravines.cpp') diff --git a/src/Generating/Ravines.cpp b/src/Generating/Ravines.cpp new file mode 100644 index 000000000..6413b963b --- /dev/null +++ b/src/Generating/Ravines.cpp @@ -0,0 +1,531 @@ + +// Ravines.cpp + +// Implements the cStructGenRavines class representing the ravine structure generator + +#include "Globals.h" +#include "Ravines.h" + + + + +/// How many ravines in each direction are generated for a given chunk. Must be an even number +static const int NEIGHBORHOOD_SIZE = 8; + +static const int NUM_RAVINE_POINTS = 4; + + + + + +struct cRavDefPoint +{ + int m_BlockX; + int m_BlockZ; + int m_Radius; + int m_Top; + int m_Bottom; + + cRavDefPoint(int a_BlockX, int a_BlockZ, int a_Radius, int a_Top, int a_Bottom) : + m_BlockX(a_BlockX), + m_BlockZ(a_BlockZ), + m_Radius(a_Radius), + m_Top (a_Top), + m_Bottom(a_Bottom) + { + } +} ; + +typedef std::vector cRavDefPoints; + + + + + +class cStructGenRavines::cRavine +{ + cRavDefPoints m_Points; + + /// Generates the shaping defpoints for the ravine, based on the ravine block coords and noise + void GenerateBaseDefPoints(int a_BlockX, int a_BlockZ, int a_Size, cNoise & a_Noise); + + /// Refines (adds and smooths) defpoints from a_Src into a_Dst + void RefineDefPoints(const cRavDefPoints & a_Src, cRavDefPoints & a_Dst); + + /// Does one round of smoothing, two passes of RefineDefPoints() + void Smooth(void); + + /// Linearly interpolates the points so that the maximum distance between two neighbors is max 1 block + void FinishLinear(void); + +public: + // Coords for which the ravine was generated (not necessarily the center) + int m_BlockX; + int m_BlockZ; + + cRavine(int a_BlockX, int a_BlockZ, int a_Size, cNoise & a_Noise); + + /// Carves the ravine into the chunk specified + void ProcessChunk( + int a_ChunkX, int a_ChunkZ, + cChunkDef::BlockTypes & a_BlockTypes, + cChunkDef::HeightMap & a_HeightMap + ); + + #ifdef _DEBUG + /// Exports itself as a SVG line definition + AString ExportAsSVG(int a_Color, int a_OffsetX = 0, int a_OffsetZ = 0) const; + #endif // _DEBUG +} ; + + + + + +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// cStructGenRavines: + +cStructGenRavines::cStructGenRavines(int a_Seed, int a_Size) : + m_Noise(a_Seed), + m_Size(a_Size) +{ +} + + + + + +cStructGenRavines::~cStructGenRavines() +{ + ClearCache(); +} + + + + + +void cStructGenRavines::ClearCache(void) +{ + for (cRavines::const_iterator itr = m_Cache.begin(), end = m_Cache.end(); itr != end; ++itr) + { + delete *itr; + } // for itr - m_Cache[] + m_Cache.clear(); +} + + + + + +void cStructGenRavines::GenStructures(cChunkDesc & a_ChunkDesc) +{ + int ChunkX = a_ChunkDesc.GetChunkX(); + int ChunkZ = a_ChunkDesc.GetChunkZ(); + cRavines Ravines; + GetRavinesForChunk(ChunkX, ChunkZ, Ravines); + for (cRavines::const_iterator itr = Ravines.begin(), end = Ravines.end(); itr != end; ++itr) + { + (*itr)->ProcessChunk(ChunkX, ChunkZ, a_ChunkDesc.GetBlockTypes(), a_ChunkDesc.GetHeightMap()); + } // for itr - Ravines[] +} + + + + + +void cStructGenRavines::GetRavinesForChunk(int a_ChunkX, int a_ChunkZ, cStructGenRavines::cRavines & a_Ravines) +{ + int BaseX = a_ChunkX * cChunkDef::Width / m_Size; + int BaseZ = a_ChunkZ * cChunkDef::Width / m_Size; + if (BaseX < 0) + { + --BaseX; + } + if (BaseZ < 0) + { + --BaseZ; + } + BaseX -= 4; + BaseZ -= 4; + + // Walk the cache, move each ravine that we want into a_Ravines: + int StartX = BaseX * m_Size; + int EndX = (BaseX + NEIGHBORHOOD_SIZE + 1) * m_Size; + int StartZ = BaseZ * m_Size; + int EndZ = (BaseZ + NEIGHBORHOOD_SIZE + 1) * m_Size; + for (cRavines::iterator itr = m_Cache.begin(), end = m_Cache.end(); itr != end;) + { + if ( + ((*itr)->m_BlockX >= StartX) && ((*itr)->m_BlockX < EndX) && + ((*itr)->m_BlockZ >= StartZ) && ((*itr)->m_BlockZ < EndZ) + ) + { + // want + a_Ravines.push_back(*itr); + itr = m_Cache.erase(itr); + } + else + { + // don't want + ++itr; + } + } // for itr - m_Cache[] + + for (int x = 0; x < NEIGHBORHOOD_SIZE; x++) + { + int RealX = (BaseX + x) * m_Size; + for (int z = 0; z < NEIGHBORHOOD_SIZE; z++) + { + int RealZ = (BaseZ + z) * m_Size; + bool Found = false; + for (cRavines::const_iterator itr = a_Ravines.begin(), end = a_Ravines.end(); itr != end; ++itr) + { + if (((*itr)->m_BlockX == RealX) && ((*itr)->m_BlockZ == RealZ)) + { + Found = true; + break; + } + } + if (!Found) + { + a_Ravines.push_back(new cRavine(RealX, RealZ, m_Size, m_Noise)); + } + } + } + + // Copy a_Ravines into m_Cache to the beginning: + cRavines RavinesCopy(a_Ravines); + m_Cache.splice(m_Cache.begin(), RavinesCopy, RavinesCopy.begin(), RavinesCopy.end()); + + // Trim the cache if it's too long: + if (m_Cache.size() > 100) + { + cRavines::iterator itr = m_Cache.begin(); + std::advance(itr, 100); + for (cRavines::iterator end = m_Cache.end(); itr != end; ++itr) + { + delete *itr; + } + itr = m_Cache.begin(); + std::advance(itr, 100); + m_Cache.erase(itr, m_Cache.end()); + } + + /* + #ifdef _DEBUG + // DEBUG: Export as SVG into a file specific for the chunk, for visual verification: + AString SVG; + SVG.append("\n\n"); + for (cRavines::const_iterator itr = a_Ravines.begin(), end = a_Ravines.end(); itr != end; ++itr) + { + SVG.append((*itr)->ExportAsSVG(0, 512, 512)); + } + SVG.append("\n"); + + AString fnam; + Printf(fnam, "ravines\\%03d_%03d.svg", a_ChunkX, a_ChunkZ); + cFile File(fnam, cFile::fmWrite); + File.Write(SVG.c_str(), SVG.size()); + #endif // _DEBUG + //*/ +} + + + + + + +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// cStructGenRavines::cRavine + +cStructGenRavines::cRavine::cRavine(int a_BlockX, int a_BlockZ, int a_Size, cNoise & a_Noise) : + m_BlockX(a_BlockX), + m_BlockZ(a_BlockZ) +{ + // Calculate the ravine shape-defining points: + GenerateBaseDefPoints(a_BlockX, a_BlockZ, a_Size, a_Noise); + + // Smooth the ravine. A two passes are needed: + Smooth(); + Smooth(); + + // Linearly interpolate the neighbors so that they're close enough together: + FinishLinear(); +} + + + + + +void cStructGenRavines::cRavine::GenerateBaseDefPoints(int a_BlockX, int a_BlockZ, int a_Size, cNoise & a_Noise) +{ + // Modify the size slightly to have different-sized ravines (1/2 to 1/1 of a_Size): + a_Size = (512 + ((a_Noise.IntNoise3DInt(19 * a_BlockX, 11 * a_BlockZ, a_BlockX + a_BlockZ) / 17) % 512)) * a_Size / 1024; + + // The complete offset of the ravine from its cellpoint, up to 2 * a_Size in each direction + int OffsetX = (((a_Noise.IntNoise3DInt(50 * a_BlockX, 30 * a_BlockZ, 0) / 9) % (2 * a_Size)) + ((a_Noise.IntNoise3DInt(30 * a_BlockX, 50 * m_BlockZ, 1000) / 7) % (2 * a_Size)) - 2 * a_Size) / 2; + int OffsetZ = (((a_Noise.IntNoise3DInt(50 * a_BlockX, 30 * a_BlockZ, 2000) / 7) % (2 * a_Size)) + ((a_Noise.IntNoise3DInt(30 * a_BlockX, 50 * m_BlockZ, 3000) / 9) % (2 * a_Size)) - 2 * a_Size) / 2; + int CenterX = a_BlockX + OffsetX; + int CenterZ = a_BlockZ + OffsetZ; + + // Get the base angle in which the ravine "axis" goes: + float Angle = (float)(((float)((a_Noise.IntNoise3DInt(20 * a_BlockX, 70 * a_BlockZ, 6000) / 9) % 16384)) / 16384.0 * 3.141592653); + float xc = sin(Angle); + float zc = cos(Angle); + + // Calculate the definition points and radii: + int MaxRadius = (int)(sqrt(12.0 + ((a_Noise.IntNoise2DInt(61 * a_BlockX, 97 * a_BlockZ) / 13) % a_Size) / 16)); + int Top = 32 + ((a_Noise.IntNoise2DInt(13 * a_BlockX, 17 * a_BlockZ) / 23) % 32); + int Bottom = 5 + ((a_Noise.IntNoise2DInt(17 * a_BlockX, 29 * a_BlockZ) / 13) % 32); + int Mid = (Top + Bottom) / 2; + int PointX = CenterX - (int)(xc * a_Size / 2); + int PointZ = CenterZ - (int)(zc * a_Size / 2); + m_Points.push_back(cRavDefPoint(PointX, PointZ, 0, (Mid + Top) / 2, (Mid + Bottom) / 2)); + for (int i = 1; i < NUM_RAVINE_POINTS - 1; i++) + { + int LineX = CenterX + (int)(xc * a_Size * (i - NUM_RAVINE_POINTS / 2) / NUM_RAVINE_POINTS); + int LineZ = CenterZ + (int)(zc * a_Size * (i - NUM_RAVINE_POINTS / 2) / NUM_RAVINE_POINTS); + // Amplitude is the amount of blocks that this point is away from the ravine "axis" + int Amplitude = (a_Noise.IntNoise3DInt(70 * a_BlockX, 20 * a_BlockZ + 31 * i, 10000 * i) / 9) % a_Size; + Amplitude = Amplitude / 4 - a_Size / 8; // Amplitude is in interval [-a_Size / 4, a_Size / 4] + int PointX = LineX + (int)(zc * Amplitude); + int PointZ = LineZ - (int)(xc * Amplitude); + int Radius = MaxRadius - abs(i - NUM_RAVINE_POINTS / 2); // TODO: better radius function + int ThisTop = Top + ((a_Noise.IntNoise3DInt(7 * a_BlockX, 19 * a_BlockZ, i * 31) / 13) % 8) - 4; + int ThisBottom = Bottom + ((a_Noise.IntNoise3DInt(19 * a_BlockX, 7 * a_BlockZ, i * 31) / 13) % 8) - 4; + m_Points.push_back(cRavDefPoint(PointX, PointZ, Radius, ThisTop, ThisBottom)); + } // for i - m_Points[] + PointX = CenterX + (int)(xc * a_Size / 2); + PointZ = CenterZ + (int)(zc * a_Size / 2); + m_Points.push_back(cRavDefPoint(PointX, PointZ, 0, Mid, Mid)); +} + + + + + +void cStructGenRavines::cRavine::RefineDefPoints(const cRavDefPoints & a_Src, cRavDefPoints & a_Dst) +{ + // Smoothing: for each line segment, add points on its 1/4 lengths + int Num = a_Src.size() - 2; // this many intermediary points + a_Dst.clear(); + a_Dst.reserve(Num * 2 + 2); + cRavDefPoints::const_iterator itr = a_Src.begin() + 1; + a_Dst.push_back(a_Src.front()); + int PrevX = a_Src.front().m_BlockX; + int PrevZ = a_Src.front().m_BlockZ; + int PrevR = a_Src.front().m_Radius; + int PrevT = a_Src.front().m_Top; + int PrevB = a_Src.front().m_Bottom; + for (int i = 0; i <= Num; ++i, ++itr) + { + int dx = itr->m_BlockX - PrevX; + int dz = itr->m_BlockZ - PrevZ; + if (abs(dx) + abs(dz) < 4) + { + // Too short a segment to smooth-subdivide into quarters + continue; + } + int dr = itr->m_Radius - PrevR; + int dt = itr->m_Top - PrevT; + int db = itr->m_Bottom - PrevB; + int Rad1 = std::max(PrevR + 1 * dr / 4, 1); + int Rad2 = std::max(PrevR + 3 * dr / 4, 1); + a_Dst.push_back(cRavDefPoint(PrevX + 1 * dx / 4, PrevZ + 1 * dz / 4, Rad1, PrevT + 1 * dt / 4, PrevB + 1 * db / 4)); + a_Dst.push_back(cRavDefPoint(PrevX + 3 * dx / 4, PrevZ + 3 * dz / 4, Rad2, PrevT + 3 * dt / 4, PrevB + 3 * db / 4)); + PrevX = itr->m_BlockX; + PrevZ = itr->m_BlockZ; + PrevR = itr->m_Radius; + PrevT = itr->m_Top; + PrevB = itr->m_Bottom; + } + a_Dst.push_back(a_Src.back()); +} + + + + + +void cStructGenRavines::cRavine::Smooth(void) +{ + cRavDefPoints Pts; + RefineDefPoints(m_Points, Pts); // Refine m_Points -> Pts + RefineDefPoints(Pts, m_Points); // Refine Pts -> m_Points +} + + + + + +void cStructGenRavines::cRavine::FinishLinear(void) +{ + // For each segment, use Bresenham's line algorithm to draw a "line" of defpoints + // _X 2012_07_20: I tried modifying this algorithm to produce "thick" lines (only one coord change per point) + // But the results were about the same as the original, so I disposed of it again - no need to use twice the count of points + + cRavDefPoints Pts; + std::swap(Pts, m_Points); + + m_Points.reserve(Pts.size() * 3); + int PrevX = Pts.front().m_BlockX; + int PrevZ = Pts.front().m_BlockZ; + for (cRavDefPoints::const_iterator itr = Pts.begin() + 1, end = Pts.end(); itr != end; ++itr) + { + int x1 = itr->m_BlockX; + int z1 = itr->m_BlockZ; + int dx = abs(x1 - PrevX); + int dz = abs(z1 - PrevZ); + int sx = (PrevX < x1) ? 1 : -1; + int sz = (PrevZ < z1) ? 1 : -1; + int err = dx - dz; + int R = itr->m_Radius; + int T = itr->m_Top; + int B = itr->m_Bottom; + while (true) + { + m_Points.push_back(cRavDefPoint(PrevX, PrevZ, R, T, B)); + if ((PrevX == x1) && (PrevZ == z1)) + { + break; + } + int e2 = 2 * err; + if (e2 > -dz) + { + err -= dz; + PrevX += sx; + } + if (e2 < dx) + { + err += dx; + PrevZ += sz; + } + } // while (true) + } // for itr +} + + + + + +#ifdef _DEBUG +AString cStructGenRavines::cRavine::ExportAsSVG(int a_Color, int a_OffsetX, int a_OffsetZ) const +{ + AString SVG; + AppendPrintf(SVG, "m_BlockX, a_OffsetZ + itr->m_BlockZ); + Prefix = 'L'; + } + SVG.append("\"/>\n"); + + // Base point highlight: + AppendPrintf(SVG, "\n", + a_OffsetX + m_BlockX - 5, a_OffsetZ + m_BlockZ, a_OffsetX + m_BlockX + 5, a_OffsetZ + m_BlockZ + ); + AppendPrintf(SVG, "\n", + a_OffsetX + m_BlockX, a_OffsetZ + m_BlockZ - 5, a_OffsetX + m_BlockX, a_OffsetZ + m_BlockZ + 5 + ); + + // A gray line from the base point to the first point of the ravine, for identification: + AppendPrintf(SVG, "\n", + a_OffsetX + m_BlockX, a_OffsetZ + m_BlockZ, a_OffsetX + m_Points.front().m_BlockX, a_OffsetZ + m_Points.front().m_BlockZ + ); + + // Offset guides: + if (a_OffsetX > 0) + { + AppendPrintf(SVG, "\n", + a_OffsetX, a_OffsetX + ); + } + if (a_OffsetZ > 0) + { + AppendPrintf(SVG, "\n", + a_OffsetZ, a_OffsetZ + ); + } + return SVG; +} +#endif // _DEBUG + + + + + +void cStructGenRavines::cRavine::ProcessChunk( + int a_ChunkX, int a_ChunkZ, + cChunkDef::BlockTypes & a_BlockTypes, + cChunkDef::HeightMap & a_HeightMap +) +{ + int BlockStartX = a_ChunkX * cChunkDef::Width; + int BlockStartZ = a_ChunkZ * cChunkDef::Width; + int BlockEndX = BlockStartX + cChunkDef::Width; + int BlockEndZ = BlockStartZ + cChunkDef::Width; + for (cRavDefPoints::const_iterator itr = m_Points.begin(), end = m_Points.end(); itr != end; ++itr) + { + if ( + (itr->m_BlockX + itr->m_Radius < BlockStartX) || + (itr->m_BlockX - itr->m_Radius > BlockEndX) || + (itr->m_BlockZ + itr->m_Radius < BlockStartZ) || + (itr->m_BlockZ - itr->m_Radius > BlockEndZ) + ) + { + // Cannot intersect, bail out early + continue; + } + + // Carve out a cylinder around the xz point, m_Radius in diameter, from Bottom to Top: + int RadiusSq = itr->m_Radius * itr->m_Radius; // instead of doing sqrt for each distance, we do sqr of the radius + int DifX = BlockStartX - itr->m_BlockX; // substitution for faster calc + int DifZ = BlockStartZ - itr->m_BlockZ; // substitution for faster calc + for (int x = 0; x < cChunkDef::Width; x++) for (int z = 0; z < cChunkDef::Width; z++) + { + #ifdef _DEBUG + // DEBUG: Make the ravine shapepoints visible on a single layer (so that we can see with Minutor what's going on) + if ((DifX + x == 0) && (DifZ + z == 0)) + { + cChunkDef::SetBlock(a_BlockTypes, x, 4, z, E_BLOCK_LAPIS_ORE); + } + #endif // _DEBUG + + int DistSq = (DifX + x) * (DifX + x) + (DifZ + z) * (DifZ + z); + if (DistSq <= RadiusSq) + { + int Top = std::min(itr->m_Top, (int)(cChunkDef::Height)); // Stupid gcc needs int cast + for (int y = std::max(itr->m_Bottom, 1); y <= Top; y++) + { + switch (cChunkDef::GetBlock(a_BlockTypes, x, y, z)) + { + // Only carve out these specific block types + case E_BLOCK_DIRT: + case E_BLOCK_GRASS: + case E_BLOCK_STONE: + case E_BLOCK_COBBLESTONE: + case E_BLOCK_GRAVEL: + case E_BLOCK_SAND: + case E_BLOCK_SANDSTONE: + case E_BLOCK_NETHERRACK: + case E_BLOCK_COAL_ORE: + case E_BLOCK_IRON_ORE: + case E_BLOCK_GOLD_ORE: + case E_BLOCK_DIAMOND_ORE: + case E_BLOCK_REDSTONE_ORE: + case E_BLOCK_REDSTONE_ORE_GLOWING: + { + cChunkDef::SetBlock(a_BlockTypes, x, y, z, E_BLOCK_AIR); + break; + } + default: break; + } + } + } + } // for x, z - a_BlockTypes + } // for itr - m_Points[] +} + + + + -- cgit v1.2.3