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Mgvalleys / cavegen: Place riverbed nodes under river water

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When a CavesNoiseIntersection tunnel intersects a river place biome
'riverbed' nodes in tunnel entrance instead of biome 'top' nodes.
This commit is contained in:
paramat 2016-07-20 00:23:08 +01:00
parent 97c763158c
commit 2ba8ad1dfe
2 changed files with 20 additions and 9 deletions
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16
src/mapgen_valleys.cpp
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@ -665,6 +665,7 @@ void MapgenValleys::generateCaves(s16 max_stone_y, s16 large_cave_depth)
for (s16 x = node_min.X; x <= node_max.X; x++, index_2d++) {
Biome *biome = (Biome *)m_bmgr->getRaw(biomemap[index_2d]);
bool tunnel_air_above = false;
bool is_under_river = false;
bool underground = false;
u32 index_data = vm->m_area.index(x, node_max.Y, z);
u32 index_3d = (z - node_min.Z) * zstride_1d + csize.Y * ystride + (x - node_min.X);
@ -696,14 +697,13 @@ void MapgenValleys::generateCaves(s16 max_stone_y, s16 large_cave_depth)
}
content_t c = vm->m_data[index_data].getContent();
// Detect river water to place riverbed nodes in tunnels
if (c == biome->c_river_water)
is_under_river = true;
float d1 = contour(noise_cave1->result[index_3d]);
float d2 = contour(noise_cave2->result[index_3d]);
// River water is not set as ground content
// in the default game. This can produce strange results
// when a tunnel undercuts a river. However, that's not for
// the mapgen to correct. Fix it in lua.
if (d1 * d2 > cave_width && ndef->get(c).is_ground_content) {
// in a tunnel
vm->m_data[index_data] = n_air;
@ -716,8 +716,10 @@ void MapgenValleys::generateCaves(s16 max_stone_y, s16 large_cave_depth)
vm->m_area.add_y(em, j, 1);
if (sr > terrain - y) {
// Put dirt in tunnels near the surface.
if (underground)
// Put biome nodes in tunnels near the surface
if (is_under_river)
vm->m_data[index_data] = MapNode(biome->c_riverbed);
else if (underground)
vm->m_data[index_data] = MapNode(biome->c_filler);
else
vm->m_data[index_data] = MapNode(biome->c_top);