summaryrefslogtreecommitdiffstats
path: root/src/Generating/GridStructGen.cpp
diff options
context:
space:
mode:
authorarchshift <admin@archshift.com>2014-07-29 22:04:00 +0200
committerarchshift <admin@archshift.com>2014-07-29 22:04:00 +0200
commita9b597087b56b4526a3f6447789ba141568575a1 (patch)
treea08542d77b5668a25ca5e00492577ed6f4d61a9a /src/Generating/GridStructGen.cpp
parentSpacing fixes and a few more BLOCK_META constants. (diff)
parentSlight cleanup after portals (diff)
downloadcuberite-a9b597087b56b4526a3f6447789ba141568575a1.tar
cuberite-a9b597087b56b4526a3f6447789ba141568575a1.tar.gz
cuberite-a9b597087b56b4526a3f6447789ba141568575a1.tar.bz2
cuberite-a9b597087b56b4526a3f6447789ba141568575a1.tar.lz
cuberite-a9b597087b56b4526a3f6447789ba141568575a1.tar.xz
cuberite-a9b597087b56b4526a3f6447789ba141568575a1.tar.zst
cuberite-a9b597087b56b4526a3f6447789ba141568575a1.zip
Diffstat (limited to 'src/Generating/GridStructGen.cpp')
-rw-r--r--src/Generating/GridStructGen.cpp184
1 files changed, 184 insertions, 0 deletions
diff --git a/src/Generating/GridStructGen.cpp b/src/Generating/GridStructGen.cpp
new file mode 100644
index 000000000..7090f14b1
--- /dev/null
+++ b/src/Generating/GridStructGen.cpp
@@ -0,0 +1,184 @@
+
+// GridStructGen.cpp
+
+// Implements the cGridStructGen class representing a common base class for structure generators that place structures in a semi-random grid
+
+#include "Globals.h"
+#include "GridStructGen.h"
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cEmptyStructure:
+
+/** A cStructure descendant representing an empty structure.
+Used when the generator descended from cGridStructGen doesn't return any structure, to keep at least the
+Origin coords so that the structure isn't queried over and over again. */
+class cEmptyStructure :
+ public cGridStructGen::cStructure
+{
+ typedef cGridStructGen::cStructure super;
+
+public:
+ cEmptyStructure(int a_GridX, int a_GridZ, int a_OriginX, int a_OriginZ) :
+ super(a_GridX, a_GridZ, a_OriginX, a_OriginZ)
+ {
+ }
+
+protected:
+ virtual void DrawIntoChunk(cChunkDesc & a_ChunkDesc) override
+ {
+ // Do nothing
+ }
+} ;
+
+
+
+
+
+cGridStructGen::cGridStructGen(
+ int a_Seed,
+ int a_GridSizeX, int a_GridSizeZ,
+ int a_MaxOffsetX, int a_MaxOffsetZ,
+ int a_MaxStructureSizeX, int a_MaxStructureSizeZ,
+ size_t a_MaxCacheSize
+) :
+ m_Seed(a_Seed),
+ m_Noise(a_Seed),
+ m_GridSizeX(a_GridSizeX),
+ m_GridSizeZ(a_GridSizeZ),
+ m_MaxOffsetX(a_MaxOffsetX),
+ m_MaxOffsetZ(a_MaxOffsetZ),
+ m_MaxStructureSizeX(a_MaxStructureSizeX),
+ m_MaxStructureSizeZ(a_MaxStructureSizeZ),
+ m_MaxCacheSize(a_MaxCacheSize)
+{
+ if (m_GridSizeX == 0)
+ {
+ LOG("Grid Size cannot be zero, setting to 1");
+ m_GridSizeX = 1;
+ }
+ if (m_GridSizeZ == 0)
+ {
+ LOG("Grid Size cannot be zero, setting to 1");
+ m_GridSizeZ = 1;
+ }
+ size_t NumStructuresPerQuery = (size_t)(((m_MaxStructureSizeX + m_MaxOffsetX) / m_GridSizeX + 1) * ((m_MaxStructureSizeZ + m_MaxOffsetZ) / m_GridSizeZ + 1));
+ if (NumStructuresPerQuery > m_MaxCacheSize)
+ {
+ m_MaxCacheSize = NumStructuresPerQuery * 4;
+ LOGINFO(
+ "cGridStructGen: The cache size is too small (%u), increasing the cache size to %u to avoid inefficiency.",
+ (unsigned)a_MaxCacheSize, (unsigned)m_MaxCacheSize
+ );
+ }
+}
+
+
+
+
+
+void cGridStructGen::GetStructuresForChunk(int a_ChunkX, int a_ChunkZ, cStructurePtrs & a_Structures)
+{
+ // Calculate the min and max grid coords of the structures to be returned:
+ int MinBlockX = a_ChunkX * cChunkDef::Width - m_MaxStructureSizeX - m_MaxOffsetX;
+ int MinBlockZ = a_ChunkZ * cChunkDef::Width - m_MaxStructureSizeZ - m_MaxOffsetZ;
+ int MaxBlockX = a_ChunkX * cChunkDef::Width + m_MaxStructureSizeX + m_MaxOffsetX + cChunkDef::Width - 1;
+ int MaxBlockZ = a_ChunkZ * cChunkDef::Width + m_MaxStructureSizeZ + m_MaxOffsetZ + cChunkDef::Width - 1;
+ int MinGridX = MinBlockX / m_GridSizeX;
+ int MinGridZ = MinBlockZ / m_GridSizeZ;
+ int MaxGridX = (MaxBlockX + m_GridSizeX - 1) / m_GridSizeX;
+ int MaxGridZ = (MaxBlockZ + m_GridSizeZ - 1) / m_GridSizeZ;
+ int MinX = MinGridX * m_GridSizeX;
+ int MaxX = MaxGridX * m_GridSizeX;
+ int MinZ = MinGridZ * m_GridSizeZ;
+ int MaxZ = MaxGridZ * m_GridSizeZ;
+
+ // Walk the cache, move each structure that we want into a_Structures:
+ for (cStructurePtrs::iterator itr = m_Cache.begin(), end = m_Cache.end(); itr != end;)
+ {
+ if (
+ ((*itr)->m_GridX >= MinX) && ((*itr)->m_GridX < MaxX) &&
+ ((*itr)->m_GridZ >= MinZ) && ((*itr)->m_GridZ < MaxZ)
+ )
+ {
+ // want
+ a_Structures.push_back(*itr);
+ itr = m_Cache.erase(itr);
+ }
+ else
+ {
+ // don't want
+ ++itr;
+ }
+ } // for itr - m_Cache[]
+
+ // Create those structures that haven't been in the cache:
+ for (int x = MinGridX; x < MaxGridX; x++)
+ {
+ int GridX = x * m_GridSizeX;
+ for (int z = MinGridZ; z < MaxGridZ; z++)
+ {
+ int GridZ = z * m_GridSizeZ;
+ bool Found = false;
+ for (cStructurePtrs::const_iterator itr = a_Structures.begin(), end = a_Structures.end(); itr != end; ++itr)
+ {
+ if (((*itr)->m_GridX == GridX) && ((*itr)->m_GridZ == GridZ))
+ {
+ Found = true;
+ break;
+ }
+ } // for itr - a_Structures[]
+ if (!Found)
+ {
+ int OriginX = GridX + ((m_Noise.IntNoise2DInt(GridX + 3, GridZ + 5) / 7) % (m_MaxOffsetX * 2)) - m_MaxOffsetX;
+ int OriginZ = GridZ + ((m_Noise.IntNoise2DInt(GridX + 5, GridZ + 3) / 7) % (m_MaxOffsetZ * 2)) - m_MaxOffsetZ;
+ cStructurePtr Structure = CreateStructure(GridX, GridZ, OriginX, OriginZ);
+ if (Structure.get() == NULL)
+ {
+ Structure.reset(new cEmptyStructure(GridX, GridZ, OriginX, OriginZ));
+ }
+ a_Structures.push_back(Structure);
+ }
+ } // for z
+ } // for x
+
+ // Copy a_Forts into m_Cache to the beginning:
+ cStructurePtrs StructuresCopy (a_Structures);
+ m_Cache.splice(m_Cache.begin(), StructuresCopy, StructuresCopy.begin(), StructuresCopy.end());
+
+ // Trim the cache if it's too long:
+ size_t CacheSize = 0;
+ for (cStructurePtrs::iterator itr = m_Cache.begin(), end = m_Cache.end(); itr != end; ++itr)
+ {
+ CacheSize += (*itr)->GetCacheCost();
+ if (CacheSize > m_MaxCacheSize)
+ {
+ // Erase all items from this one till the cache end
+ m_Cache.erase(itr, m_Cache.end());
+ break;
+ }
+ }
+}
+
+
+
+
+
+void cGridStructGen::GenFinish(cChunkDesc & a_ChunkDesc)
+{
+ int ChunkX = a_ChunkDesc.GetChunkX();
+ int ChunkZ = a_ChunkDesc.GetChunkZ();
+ cStructurePtrs Structures;
+ GetStructuresForChunk(ChunkX, ChunkZ, Structures);
+ for (cStructurePtrs::const_iterator itr = Structures.begin(); itr != Structures.end(); ++itr)
+ {
+ (*itr)->DrawIntoChunk(a_ChunkDesc);
+ } // for itr - Structures[]
+}
+
+
+
+
+