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Mgvalleys: Don't let cavegen place biome nodes everywhere

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Fix use of 'air_above' bool so that biome
nodes are only placed in tunnel floors
Minor code improvements
'Continue' when massive cave air is placed
This commit is contained in:
paramat 2016-04-09 00:24:36 +01:00
parent 73d4538d94
commit fe349d401d
1 changed files with 36 additions and 41 deletions
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39
src/mapgen_valleys.cpp
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@ -921,14 +921,13 @@ void MapgenValleys::generateCaves(s16 max_stone_y)
}
u32 index_2d = 0;
u32 index_3d = 0;
for (s16 z = node_min.Z; z <= node_max.Z; z++)
for (s16 x = node_min.X; x <= node_max.X; x++, index_2d++) {
Biome *biome = (Biome *)bmgr->getRaw(biomemap[index_2d]);
bool air_above = false;
bool tunnel_air_above = false;
bool underground = false;
u32 index_data = vm->m_area.index(x, node_max.Y, z);
index_3d = (z - node_min.Z) * zstride_1d + csize.Y * ystride + (x - node_min.X);
u32 index_3d = (z - node_min.Z) * zstride_1d + csize.Y * ystride + (x - node_min.X);
// Dig caves on down loop to check for air above.
// Don't excavate the overgenerated stone at node_max.Y + 1,
@ -942,12 +941,10 @@ void MapgenValleys::generateCaves(s16 max_stone_y)
float terrain = noise_terrain_height->result[index_2d];
// Saves some time.
if (y > terrain + 10) {
air_above = true;
if (y > terrain + 10)
continue;
} else if (y < terrain - 40) {
else if (y < terrain - 40)
underground = true;
}
// Dig massive caves.
if (node_max.Y <= massive_cave_depth
@ -955,6 +952,7 @@ void MapgenValleys::generateCaves(s16 max_stone_y)
> tcave_cache[y - node_min.Y + 1]) {
vm->m_data[index_data] = n_air;
made_a_big_one = true;
continue;
}
content_t c = vm->m_data[index_data].getContent();
@ -963,23 +961,22 @@ void MapgenValleys::generateCaves(s16 max_stone_y)
// River water is not set as ground content
// in the default game. This can produce strange results
// when a cave undercuts a river. However, that's not for
// when a tunnel undercuts a river. However, that's not for
// the mapgen to correct. Fix it in lua.
if (c == CONTENT_AIR) {
air_above = true;
} else if (d1 * d2 > 0.3f && ndef->get(c).is_ground_content) {
// in a cave
if (d1 * d2 > 0.3f && ndef->get(c).is_ground_content) {
// in a tunnel
vm->m_data[index_data] = n_air;
air_above = true;
} else if (air_above && (c == biome->c_filler || c == biome->c_stone)) {
// at the cave floor
tunnel_air_above = true;
} else if (c == biome->c_filler || c == biome->c_stone) {
if (tunnel_air_above) {
// at the tunnel floor
s16 sr = ps.range(0, 39);
u32 j = index_data;
vm->m_area.add_y(em, j, 1);
if (sr > terrain - y) {
// Put dirt in caves near the surface.
// Put dirt in tunnels near the surface.
if (underground)
vm->m_data[index_data] = MapNode(biome->c_filler);
else
@ -998,19 +995,17 @@ void MapgenValleys::generateCaves(s16 max_stone_y)
&& sr >= 0 && sr < water_chance)
vm->m_data[j] = n_water;
}
}
air_above = false;
underground = true;
} else if (c == biome->c_filler || c == biome->c_stone) {
air_above = false;
tunnel_air_above = false;
underground = true;
} else {
air_above = false;
tunnel_air_above = false;
}
}
}
if (node_max.Y <= large_cave_depth && (!made_a_big_one)) {
if (node_max.Y <= large_cave_depth && !made_a_big_one) {
u32 bruises_count = ps.range(0, 2);
for (u32 i = 0; i < bruises_count; i++) {
CaveV5 cave(this, &ps);