summaryrefslogtreecommitdiffstats
path: root/src/Generating/Ravines.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/Generating/Ravines.cpp')
-rw-r--r--src/Generating/Ravines.cpp531
1 files changed, 531 insertions, 0 deletions
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<cRavDefPoint> 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("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"1024\" height = \"1024\">\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("</svg>\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, "<path style=\"fill:none;stroke:#%06x;stroke-width:1px;\"\nd=\"", a_Color);
+ char Prefix = 'M'; // The first point needs "M" prefix, all the others need "L"
+ for (cRavDefPoints::const_iterator itr = m_Points.begin(); itr != m_Points.end(); ++itr)
+ {
+ AppendPrintf(SVG, "%c %d,%d ", Prefix, a_OffsetX + itr->m_BlockX, a_OffsetZ + itr->m_BlockZ);
+ Prefix = 'L';
+ }
+ SVG.append("\"/>\n");
+
+ // Base point highlight:
+ AppendPrintf(SVG, "<path style=\"fill:none;stroke:#ff0000;stroke-width:1px;\"\nd=\"M %d,%d L %d,%d\"/>\n",
+ a_OffsetX + m_BlockX - 5, a_OffsetZ + m_BlockZ, a_OffsetX + m_BlockX + 5, a_OffsetZ + m_BlockZ
+ );
+ AppendPrintf(SVG, "<path style=\"fill:none;stroke:#ff0000;stroke-width:1px;\"\nd=\"M %d,%d L %d,%d\"/>\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, "<path style=\"fill:none;stroke:#cfcfcf;stroke-width:1px;\"\nd=\"M %d,%d L %d,%d\"/>\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, "<path style=\"fill:none;stroke:#0000ff;stroke-width:1px;\"\nd=\"M %d,0 L %d,1024\"/>\n",
+ a_OffsetX, a_OffsetX
+ );
+ }
+ if (a_OffsetZ > 0)
+ {
+ AppendPrintf(SVG, "<path style=\"fill:none;stroke:#0000ff;stroke-width:1px;\"\nd=\"M 0,%d L 1024,%d\"/>\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[]
+}
+
+
+
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-13 14:38:23 +0200