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Cavegen: Place correct biome surface in tunnel entrances

Previously in tunnel entrance floors only a single biome 'top' node was
placed and 'filler' nodes were missing.

Place 'top' and 'filler' nodes in tunnel entrance floors with depths
defined by the biome.
In tunnel entrances under rivers 'riverbed' nodes are placed to the
biome-defined depth.
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paramat committed Feb 15, 2017
1 parent 3955f51 commit 9aabfd5188ce42c98f5ccbe275776dee5ace057d
Showing with 33 additions and 15 deletions.
  1. +33 −15 src/cavegen.cpp
@@ -74,19 +74,23 @@ void CavesNoiseIntersection::generateCaves(MMVManip *vm,
noise_cave2->perlinMap3D(nmin.X, nmin.Y - 1, nmin.Z);

v3s16 em = vm->m_area.getExtent();
u32 index2d = 0;
u32 index2d = 0; // Biomemap index

for (s16 z = nmin.Z; z <= nmax.Z; z++)
for (s16 x = nmin.X; x <= nmax.X; x++, index2d++) {
bool column_is_open = false; // Is column open to overground
bool is_under_river = false; // Is column under river water
bool is_tunnel = false; // Is tunnel or tunnel floor
bool is_under_tunnel = false; // Is tunnel or is under tunnel
// Indexes at column top
u32 vi = vm->m_area.index(x, nmax.Y, z);
u32 index3d = (z - nmin.Z) * m_zstride_1d + m_csize.Y * m_ystride +
(x - nmin.X);
(x - nmin.X); // 3D noise index
// Biome of column
Biome *biome = (Biome *)m_bmgr->getRaw(biomemap[index2d]);

u16 depth_top = biome->depth_top;
u16 base_filler = depth_top + biome->depth_filler;
u16 depth_riverbed = biome->depth_riverbed;
u16 nplaced = 0;
// Don't excavate the overgenerated stone at nmax.Y + 1,
// this creates a 'roof' over the tunnel, preventing light in
// tunnels at mapchunk borders when generating mapchunks upwards.
@@ -112,20 +116,34 @@ void CavesNoiseIntersection::generateCaves(MMVManip *vm,
if (d1 * d2 > m_cave_width && m_ndef->get(c).is_ground_content) {
// In tunnel and ground content, excavate
vm->m_data[vi] = MapNode(CONTENT_AIR);
is_tunnel = true;
} else {
// Not in tunnel or not ground content
if (is_tunnel && column_is_open &&
(c == biome->c_filler || c == biome->c_stone)) {
// Tunnel entrance floor
if (is_under_river)
is_under_tunnel = true;
} else if (column_is_open && is_under_tunnel &&
(c == biome->c_stone || c == biome->c_filler)) {
// Tunnel entrance floor, place biome surface nodes
if (is_under_river) {
if (nplaced < depth_riverbed) {
vm->m_data[vi] = MapNode(biome->c_riverbed);
else
vm->m_data[vi] = MapNode(biome->c_top);
nplaced++;
} else {
// Disable top/filler placement
column_is_open = false;
is_under_river = false;
is_under_tunnel = false;
}
} else if (nplaced < depth_top) {
vm->m_data[vi] = MapNode(biome->c_top);
nplaced++;
} else if (nplaced < base_filler) {
vm->m_data[vi] = MapNode(biome->c_filler);
nplaced++;
} else {
// Disable top/filler placement
column_is_open = false;
is_under_tunnel = false;
}

} else {
// Not tunnel or tunnel entrance floor
column_is_open = false;
is_tunnel = false;
}
}
}

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