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-rw-r--r--src/cavegen.cpp79
-rw-r--r--src/cavegen.h45
-rw-r--r--src/mapgen.cpp6
-rw-r--r--src/mapgen_valleys.cpp6
4 files changed, 98 insertions, 38 deletions
diff --git a/src/cavegen.cpp b/src/cavegen.cpp
index 59878c890..25e8473bc 100644
--- a/src/cavegen.cpp
+++ b/src/cavegen.cpp
@@ -31,23 +31,52 @@ NoiseParams nparams_caveliquids(0, 1, v3f(150.0, 150.0, 150.0), 776, 3, 0.6, 2.0
//// CavesRandomWalk
////
-CavesRandomWalk::CavesRandomWalk(Mapgen *mg, PseudoRandom *ps)
+CavesRandomWalk::CavesRandomWalk(
+ INodeDefManager *ndef,
+ GenerateNotifier *gennotify,
+ int seed,
+ int water_level,
+ content_t water_source,
+ content_t lava_source)
{
- this->mg = mg;
- this->vm = mg->vm;
- this->ndef = mg->ndef;
- this->water_level = mg->water_level;
- this->ps = ps;
- c_water_source = ndef->getId("mapgen_water_source");
- c_lava_source = ndef->getId("mapgen_lava_source");
- c_ice = ndef->getId("mapgen_ice");
+ assert(ndef);
+
+ this->ndef = ndef;
+ this->gennotify = gennotify;
+ this->seed = seed;
+ this->water_level = water_level;
this->np_caveliquids = &nparams_caveliquids;
- this->ystride = mg->csize.X;
this->lava_depth = DEFAULT_LAVA_DEPTH;
- if (c_ice == CONTENT_IGNORE)
- c_ice = CONTENT_AIR;
+ c_water_source = water_source;
+ if (c_water_source == CONTENT_IGNORE)
+ c_water_source = ndef->getId("mapgen_water_source");
+ if (c_water_source == CONTENT_IGNORE)
+ c_water_source = CONTENT_AIR;
+ c_lava_source = lava_source;
+ if (c_lava_source == CONTENT_IGNORE)
+ c_lava_source = ndef->getId("mapgen_lava_source");
+ if (c_lava_source == CONTENT_IGNORE)
+ c_lava_source = CONTENT_AIR;
+}
+
+
+void CavesRandomWalk::makeCave(MMVManip *vm, v3s16 nmin, v3s16 nmax,
+ PseudoRandom *ps, int max_stone_height, s16 *heightmap)
+{
+ assert(vm);
+ assert(ps);
+
+ this->vm = vm;
+ this->ps = ps;
+ this->node_min = nmin;
+ this->node_max = nmax;
+ this->heightmap = heightmap;
+
+ this->ystride = nmax.X - nmin.X + 1;
+
+ // Set initial parameters from randomness
dswitchint = ps->range(1, 14);
flooded = ps->range(1, 2) == 2;
@@ -57,13 +86,7 @@ CavesRandomWalk::CavesRandomWalk(Mapgen *mg, PseudoRandom *ps)
max_tunnel_diameter = ps->range(7, ps->range(8, 24));
large_cave_is_flat = (ps->range(0, 1) == 0);
-}
-
-void CavesRandomWalk::makeCave(v3s16 nmin, v3s16 nmax, int max_stone_height)
-{
- node_min = nmin;
- node_max = nmax;
main_direction = v3f(0, 0, 0);
// Allowed route area size in nodes
@@ -107,18 +130,22 @@ void CavesRandomWalk::makeCave(v3s16 nmin, v3s16 nmax, int max_stone_height)
);
// Add generation notify begin event
- v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
- GenNotifyType notifytype = GENNOTIFY_LARGECAVE_BEGIN;
- mg->gennotify.addEvent(notifytype, abs_pos);
+ if (gennotify) {
+ v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
+ GenNotifyType notifytype = GENNOTIFY_LARGECAVE_BEGIN;
+ gennotify->addEvent(notifytype, abs_pos);
+ }
// Generate some tunnel starting from orp
for (u16 j = 0; j < tunnel_routepoints; j++)
makeTunnel(j % dswitchint == 0);
// Add generation notify end event
- abs_pos = v3s16(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
- notifytype = GENNOTIFY_LARGECAVE_END;
- mg->gennotify.addEvent(notifytype, abs_pos);
+ if (gennotify) {
+ v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
+ GenNotifyType notifytype = GENNOTIFY_LARGECAVE_END;
+ gennotify->addEvent(notifytype, abs_pos);
+ }
}
@@ -197,7 +224,7 @@ void CavesRandomWalk::carveRoute(v3f vec, float f, bool randomize_xz)
startp += of;
float nval = NoisePerlin3D(np_caveliquids, startp.X,
- startp.Y, startp.Z, mg->seed);
+ startp.Y, startp.Z, seed);
MapNode liquidnode = (nval < 0.40 && node_max.Y < lava_depth) ?
lavanode : waternode;
@@ -388,7 +415,7 @@ void CavesV6::makeCave(MMVManip *vm, v3s16 nmin, v3s16 nmax,
// Add generation notify end event
if (gennotify != NULL) {
- v3s16 abs_pos = v3s16(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
+ v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
GenNotifyType notifytype = large_cave ?
GENNOTIFY_LARGECAVE_END : GENNOTIFY_CAVE_END;
gennotify->addEvent(notifytype, abs_pos);
diff --git a/src/cavegen.h b/src/cavegen.h
index 5a41966fe..2db5e9d4f 100644
--- a/src/cavegen.h
+++ b/src/cavegen.h
@@ -25,17 +25,35 @@ with this program; if not, write to the Free Software Foundation, Inc.,
class GenerateNotifier;
+/*
+ CavesRandomWalk is an implementation of a cave-digging algorithm that
+ operates on the principle of a "random walk" to approximate the stochiastic
+ activity of cavern development.
+
+ In summary, this algorithm works by carving a randomly sized tunnel in a
+ random direction a random amount of times, randomly varying in width.
+ All randomness here is uniformly distributed; alternative distributions have
+ not yet been implemented.
+
+ This algorithm is very fast, executing in less than 1ms on average for an
+ 80x80x80 chunk of map on a modern processor.
+*/
class CavesRandomWalk {
public:
- Mapgen *mg;
MMVManip *vm;
INodeDefManager *ndef;
+ GenerateNotifier *gennotify;
s16 *heightmap;
- // variables
+ // configurable parameters
+ int seed;
+ int water_level;
int lava_depth;
NoiseParams *np_caveliquids;
+ // intermediate state variables
+ u16 ystride;
+
s16 min_tunnel_diameter;
s16 max_tunnel_diameter;
u16 tunnel_routepoints;
@@ -62,17 +80,26 @@ public:
content_t c_water_source;
content_t c_lava_source;
- content_t c_ice;
- int water_level;
- u16 ystride;
+ // ndef is a mandatory parameter.
+ // If gennotify is NULL, generation events are not logged.
+ CavesRandomWalk(INodeDefManager *ndef,
+ GenerateNotifier *gennotify = NULL,
+ int seed = 0,
+ int water_level = 1,
+ content_t water_source = CONTENT_IGNORE,
+ content_t lava_source = CONTENT_IGNORE);
- CavesRandomWalk(Mapgen *mg, PseudoRandom *ps);
- void makeCave(v3s16 nmin, v3s16 nmax, int max_stone_height);
+ // vm and ps are mandatory parameters.
+ // If heightmap is NULL, the surface level at all points is assumed to
+ // be water_level.
+ void makeCave(MMVManip *vm, v3s16 nmin, v3s16 nmax,
+ PseudoRandom *ps, int max_stone_height, s16 *heightmap);
+
+private:
void makeTunnel(bool dirswitch);
void carveRoute(v3f vec, float f, bool randomize_xz);
-private:
inline bool isPosAboveSurface(v3s16 p);
};
@@ -97,11 +124,13 @@ public:
PseudoRandom *ps;
PseudoRandom *ps2;
+ // configurable parameters
s16 *heightmap;
content_t c_water_source;
content_t c_lava_source;
int water_level;
+ // intermediate state variables
u16 ystride;
s16 min_tunnel_diameter;
diff --git a/src/mapgen.cpp b/src/mapgen.cpp
index 43ac6e51a..7e74ad642 100644
--- a/src/mapgen.cpp
+++ b/src/mapgen.cpp
@@ -599,8 +599,10 @@ void MapgenBasic::generateCaves(s16 max_stone_y, s16 large_cave_depth)
PseudoRandom ps(blockseed + 21343);
u32 bruises_count = ps.range(0, 2);
for (u32 i = 0; i < bruises_count; i++) {
- CavesRandomWalk cave(this, &ps);
- cave.makeCave(node_min, node_max, max_stone_y);
+ CavesRandomWalk cave(ndef, &gennotify, seed, water_level,
+ c_water_source, CONTENT_IGNORE);
+
+ cave.makeCave(vm, node_min, node_max, &ps, max_stone_y, heightmap);
}
}
diff --git a/src/mapgen_valleys.cpp b/src/mapgen_valleys.cpp
index 77fa1ed06..af7a8b153 100644
--- a/src/mapgen_valleys.cpp
+++ b/src/mapgen_valleys.cpp
@@ -841,8 +841,10 @@ void MapgenValleys::generateCaves(s16 max_stone_y, s16 large_cave_depth)
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++) {
- CavesRandomWalk cave(this, &ps);
- cave.makeCave(node_min, node_max, max_stone_y);
+ CavesRandomWalk cave(ndef, &gennotify, seed, water_level,
+ c_water_source, c_lava_source);
+
+ cave.makeCave(vm, node_min, node_max, &ps, max_stone_y, heightmap);
}
}
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 00:38:26 +0000