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-rw-r--r--source/Generating/CompoGen.cpp98
1 files changed, 98 insertions, 0 deletions
diff --git a/source/Generating/CompoGen.cpp b/source/Generating/CompoGen.cpp
index 53d10c674..e1d620ab3 100644
--- a/source/Generating/CompoGen.cpp
+++ b/source/Generating/CompoGen.cpp
@@ -425,3 +425,101 @@ void cCompoGenBiomal::FillColumnPattern(int a_RelX, int a_RelZ, int a_Height, cC
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cCompoGenNether:
+
+cCompoGenNether::cCompoGenNether(int a_Seed) :
+ m_Noise1(a_Seed + 10),
+ m_Noise2(a_Seed * a_Seed * 10 + a_Seed * 1000 + 6000),
+ m_Threshold(0)
+{
+}
+
+
+
+
+
+void cCompoGenNether::ComposeTerrain(
+ int a_ChunkX, int a_ChunkZ,
+ cChunkDef::BlockTypes & a_BlockTypes, // BlockTypes to be generated
+ cChunkDef::BlockNibbles & a_BlockMeta, // BlockMetas to be generated
+ const cChunkDef::HeightMap & a_HeightMap, // The height map to fit
+ const cChunkDef::BiomeMap & a_BiomeMap, // Biomes to adhere to
+ cEntityList & a_Entities, // Entitites may be generated along with the terrain
+ cBlockEntityList & a_BlockEntities // Block entitites may be generated (chests / furnaces / ...)
+)
+{
+ HEIGHTTYPE MaxHeight = 0;
+ for (int i = 0; i < ARRAYCOUNT(a_HeightMap); i++)
+ {
+ if (a_HeightMap[i] > MaxHeight)
+ {
+ MaxHeight = a_HeightMap[i];
+ }
+ }
+
+ const int SEGMENT_HEIGHT = 8;
+ const int INTERPOL_X = 16; // Must be a divisor of 16
+ const int INTERPOL_Z = 16; // Must be a divisor of 16
+ // Interpolate the chunk in 16 * SEGMENT_HEIGHT * 16 "segments", each 8 blocks high and each linearly interpolated separately.
+ // Have two buffers, one for the lowest floor and one for the highest floor, so that Y-interpolation can be done between them
+ // Then swap the buffers and use the previously-top one as the current-bottom, without recalculating it.
+
+ int FloorBuf1[17 * 17];
+ int FloorBuf2[17 * 17];
+ int * FloorHi = FloorBuf1;
+ int * FloorLo = FloorBuf2;
+ int BaseX = a_ChunkX * cChunkDef::Width;
+ int BaseZ = a_ChunkZ * cChunkDef::Width;
+
+ // Interpolate the lowest floor:
+ for (int z = 0; z <= 16 / INTERPOL_Z; z++) for (int x = 0; x <= 16 / INTERPOL_X; x++)
+ {
+ FloorLo[INTERPOL_X * x + 17 * INTERPOL_Z * z] =
+ m_Noise1.IntNoise3DInt(BaseX + INTERPOL_X * x, 0, BaseZ + INTERPOL_Z * z) *
+ m_Noise2.IntNoise3DInt(BaseX + INTERPOL_X * x, 0, BaseZ + INTERPOL_Z * z) /
+ 256;
+ } // for x, z - FloorLo[]
+ IntArrayLinearInterpolate2D(FloorLo, 17, 17, INTERPOL_X, INTERPOL_Z);
+
+ // Interpolate segments:
+ for (int Segment = 0; Segment < MaxHeight; Segment += SEGMENT_HEIGHT)
+ {
+ // First update the high floor:
+ for (int z = 0; z <= 16 / INTERPOL_Z; z++) for (int x = 0; x <= 16 / INTERPOL_X; x++)
+ {
+ FloorHi[INTERPOL_X * x + 17 * INTERPOL_Z * z] =
+ m_Noise1.IntNoise3DInt(BaseX + INTERPOL_X * x, Segment + SEGMENT_HEIGHT, BaseZ + INTERPOL_Z * z) *
+ m_Noise2.IntNoise3DInt(BaseX + INTERPOL_Z * x, Segment + SEGMENT_HEIGHT, BaseZ + INTERPOL_Z * z) /
+ 256;
+ } // for x, z - FloorLo[]
+ IntArrayLinearInterpolate2D(FloorHi, 17, 17, INTERPOL_X, INTERPOL_Z);
+
+ // Interpolate between FloorLo and FloorHi:
+ for (int z = 0; z < 16; z++) for (int x = 0; x < 16; x++)
+ {
+ int Lo = FloorLo[x + 17 * z] / 256;
+ int Hi = FloorHi[x + 17 * z] / 256;
+ for (int y = 0; y < SEGMENT_HEIGHT; y++)
+ {
+ int Val = Lo + (Hi - Lo) * y / SEGMENT_HEIGHT;
+ cChunkDef::SetBlock(a_BlockTypes, x, y + Segment, z, (Val < m_Threshold) ? E_BLOCK_NETHERRACK : E_BLOCK_AIR);
+ }
+ }
+
+ // Swap the floors:
+ std::swap(FloorLo, FloorHi);
+ }
+
+ // Bedrock at the bottom and at the top:
+ for (int z = 0; z < 16; z++) for (int x = 0; x < 16; x++)
+ {
+ cChunkDef::SetBlock(a_BlockTypes, x, 0, z, E_BLOCK_BEDROCK);
+ cChunkDef::SetBlock(a_BlockTypes, x, cChunkDef::GetHeight(a_HeightMap, x, z), z, E_BLOCK_BEDROCK);
+ }
+}
+
+
+
+