minetest/src/cavegen.cpp
2017-08-16 08:26:04 +02:00

866 lines
24 KiB
C++

/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "util/numeric.h"
#include "map.h"
#include "mapgen.h"
#include "mapgen_v5.h"
#include "mapgen_v6.h"
#include "mapgen_v7.h"
#include "mg_biome.h"
#include "cavegen.h"
static NoiseParams nparams_caveliquids(0, 1, v3f(150.0, 150.0, 150.0), 776, 3, 0.6, 2.0);
////
//// CavesNoiseIntersection
////
CavesNoiseIntersection::CavesNoiseIntersection(
INodeDefManager *nodedef, BiomeManager *biomemgr, v3s16 chunksize,
NoiseParams *np_cave1, NoiseParams *np_cave2, s32 seed, float cave_width)
{
assert(nodedef);
assert(biomemgr);
m_ndef = nodedef;
m_bmgr = biomemgr;
m_csize = chunksize;
m_cave_width = cave_width;
m_ystride = m_csize.X;
m_zstride_1d = m_csize.X * (m_csize.Y + 1);
// Noises are created using 1-down overgeneration
// A Nx-by-1-by-Nz-sized plane is at the bottom of the desired for
// re-carving the solid overtop placed for blocking sunlight
noise_cave1 = new Noise(np_cave1, seed, m_csize.X, m_csize.Y + 1, m_csize.Z);
noise_cave2 = new Noise(np_cave2, seed, m_csize.X, m_csize.Y + 1, m_csize.Z);
}
CavesNoiseIntersection::~CavesNoiseIntersection()
{
delete noise_cave1;
delete noise_cave2;
}
void CavesNoiseIntersection::generateCaves(MMVManip *vm,
v3s16 nmin, v3s16 nmax, u8 *biomemap)
{
assert(vm);
assert(biomemap);
noise_cave1->perlinMap3D(nmin.X, nmin.Y - 1, nmin.Z);
noise_cave2->perlinMap3D(nmin.X, nmin.Y - 1, nmin.Z);
const v3s16 &em = vm->m_area.getExtent();
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_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); // 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.
// This 'roof' is removed when the mapchunk above is generated.
for (s16 y = nmax.Y; y >= nmin.Y - 1; y--,
index3d -= m_ystride,
vm->m_area.add_y(em, vi, -1)) {
content_t c = vm->m_data[vi].getContent();
if (c == CONTENT_AIR || c == biome->c_water_top ||
c == biome->c_water) {
column_is_open = true;
continue;
} else if (c == biome->c_river_water) {
column_is_open = true;
is_under_river = true;
continue;
}
// Ground
float d1 = contour(noise_cave1->result[index3d]);
float d2 = contour(noise_cave2->result[index3d]);
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_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);
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;
}
}
}
}
////
//// CavernsNoise
////
CavernsNoise::CavernsNoise(
INodeDefManager *nodedef, v3s16 chunksize, NoiseParams *np_cavern,
s32 seed, float cavern_limit, float cavern_taper, float cavern_threshold)
{
assert(nodedef);
m_ndef = nodedef;
m_csize = chunksize;
m_cavern_limit = cavern_limit;
m_cavern_taper = cavern_taper;
m_cavern_threshold = cavern_threshold;
m_ystride = m_csize.X;
m_zstride_1d = m_csize.X * (m_csize.Y + 1);
// Noise is created using 1-down overgeneration
// A Nx-by-1-by-Nz-sized plane is at the bottom of the desired for
// re-carving the solid overtop placed for blocking sunlight
noise_cavern = new Noise(np_cavern, seed, m_csize.X, m_csize.Y + 1, m_csize.Z);
c_water_source = m_ndef->getId("mapgen_water_source");
if (c_water_source == CONTENT_IGNORE)
c_water_source = CONTENT_AIR;
c_lava_source = m_ndef->getId("mapgen_lava_source");
if (c_lava_source == CONTENT_IGNORE)
c_lava_source = CONTENT_AIR;
}
CavernsNoise::~CavernsNoise()
{
delete noise_cavern;
}
bool CavernsNoise::generateCaverns(MMVManip *vm, v3s16 nmin, v3s16 nmax)
{
assert(vm);
// Calculate noise
noise_cavern->perlinMap3D(nmin.X, nmin.Y - 1, nmin.Z);
// Cache cavern_amp values
float *cavern_amp = new float[m_csize.Y + 1];
u8 cavern_amp_index = 0; // Index zero at column top
for (s16 y = nmax.Y; y >= nmin.Y - 1; y--, cavern_amp_index++) {
cavern_amp[cavern_amp_index] =
MYMIN((m_cavern_limit - y) / (float)m_cavern_taper, 1.0f);
}
//// Place nodes
bool near_cavern = false;
const v3s16 &em = vm->m_area.getExtent();
u32 index2d = 0;
for (s16 z = nmin.Z; z <= nmax.Z; z++)
for (s16 x = nmin.X; x <= nmax.X; x++, index2d++) {
// Reset cave_amp index to column top
cavern_amp_index = 0;
// Initial voxelmanip index at column top
u32 vi = vm->m_area.index(x, nmax.Y, z);
// Initial 3D noise index at column top
u32 index3d = (z - nmin.Z) * m_zstride_1d + m_csize.Y * m_ystride +
(x - nmin.X);
// Don't excavate the overgenerated stone at node_max.Y + 1,
// this creates a 'roof' over the cavern, preventing light in
// caverns at mapchunk borders when generating mapchunks upwards.
// This 'roof' is excavated when the mapchunk above is generated.
for (s16 y = nmax.Y; y >= nmin.Y - 1; y--,
index3d -= m_ystride,
vm->m_area.add_y(em, vi, -1),
cavern_amp_index++) {
content_t c = vm->m_data[vi].getContent();
float n_absamp_cavern = fabs(noise_cavern->result[index3d]) *
cavern_amp[cavern_amp_index];
// Disable CavesRandomWalk at a safe distance from caverns
// to avoid excessively spreading liquids in caverns.
if (n_absamp_cavern > m_cavern_threshold - 0.1f) {
near_cavern = true;
if (n_absamp_cavern > m_cavern_threshold &&
m_ndef->get(c).is_ground_content)
vm->m_data[vi] = MapNode(CONTENT_AIR);
}
}
}
delete[] cavern_amp;
return near_cavern;
}
////
//// CavesRandomWalk
////
CavesRandomWalk::CavesRandomWalk(
INodeDefManager *ndef,
GenerateNotifier *gennotify,
s32 seed,
int water_level,
content_t water_source,
content_t lava_source,
int lava_depth)
{
assert(ndef);
this->ndef = ndef;
this->gennotify = gennotify;
this->seed = seed;
this->water_level = water_level;
this->np_caveliquids = &nparams_caveliquids;
this->lava_depth = lava_depth;
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, bool is_large_cave, 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->large_cave = is_large_cave;
this->ystride = nmax.X - nmin.X + 1;
// Set initial parameters from randomness
int dswitchint = ps->range(1, 14);
flooded = ps->range(1, 2) == 2;
if (large_cave) {
part_max_length_rs = ps->range(2, 4);
tunnel_routepoints = ps->range(5, ps->range(15, 30));
min_tunnel_diameter = 5;
max_tunnel_diameter = ps->range(7, ps->range(8, 24));
} else {
part_max_length_rs = ps->range(2, 9);
tunnel_routepoints = ps->range(10, ps->range(15, 30));
min_tunnel_diameter = 2;
max_tunnel_diameter = ps->range(2, 6);
}
large_cave_is_flat = (ps->range(0, 1) == 0);
main_direction = v3f(0, 0, 0);
// Allowed route area size in nodes
ar = node_max - node_min + v3s16(1, 1, 1);
// Area starting point in nodes
of = node_min;
// Allow a bit more
//(this should be more than the maximum radius of the tunnel)
const s16 insure = 10;
s16 more = MYMAX(MAP_BLOCKSIZE - max_tunnel_diameter / 2 - insure, 1);
ar += v3s16(1, 0, 1) * more * 2;
of -= v3s16(1, 0, 1) * more;
route_y_min = 0;
// Allow half a diameter + 7 over stone surface
route_y_max = -of.Y + max_stone_y + max_tunnel_diameter / 2 + 7;
// Limit maximum to area
route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
if (large_cave) {
s16 minpos = 0;
if (node_min.Y < water_level && node_max.Y > water_level) {
minpos = water_level - max_tunnel_diameter / 3 - of.Y;
route_y_max = water_level + max_tunnel_diameter / 3 - of.Y;
}
route_y_min = ps->range(minpos, minpos + max_tunnel_diameter);
route_y_min = rangelim(route_y_min, 0, route_y_max);
}
s16 route_start_y_min = route_y_min;
s16 route_start_y_max = route_y_max;
route_start_y_min = rangelim(route_start_y_min, 0, ar.Y - 1);
route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y - 1);
// Randomize starting position
orp.Z = (float)(ps->next() % ar.Z) + 0.5f;
orp.Y = (float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5f;
orp.X = (float)(ps->next() % ar.X) + 0.5f;
// Add generation notify begin event
if (gennotify) {
v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
GenNotifyType notifytype = large_cave ?
GENNOTIFY_LARGECAVE_BEGIN : GENNOTIFY_CAVE_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
if (gennotify) {
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);
}
}
void CavesRandomWalk::makeTunnel(bool dirswitch)
{
if (dirswitch && !large_cave) {
main_direction.Z = ((float)(ps->next() % 20) - (float)10) / 10;
main_direction.Y = ((float)(ps->next() % 20) - (float)10) / 30;
main_direction.X = ((float)(ps->next() % 20) - (float)10) / 10;
main_direction *= (float)ps->range(0, 10) / 10;
}
// Randomize size
s16 min_d = min_tunnel_diameter;
s16 max_d = max_tunnel_diameter;
rs = ps->range(min_d, max_d);
s16 rs_part_max_length_rs = rs * part_max_length_rs;
v3s16 maxlen;
if (large_cave) {
maxlen = v3s16(
rs_part_max_length_rs,
rs_part_max_length_rs / 2,
rs_part_max_length_rs
);
} else {
maxlen = v3s16(
rs_part_max_length_rs,
ps->range(1, rs_part_max_length_rs),
rs_part_max_length_rs
);
}
v3f vec;
// Jump downward sometimes
if (!large_cave && ps->range(0, 12) == 0) {
vec.Z = (float)(ps->next() % (maxlen.Z * 1)) - (float)maxlen.Z / 2;
vec.Y = (float)(ps->next() % (maxlen.Y * 2)) - (float)maxlen.Y;
vec.X = (float)(ps->next() % (maxlen.X * 1)) - (float)maxlen.X / 2;
} else {
vec.Z = (float)(ps->next() % (maxlen.Z * 1)) - (float)maxlen.Z / 2;
vec.Y = (float)(ps->next() % (maxlen.Y * 1)) - (float)maxlen.Y / 2;
vec.X = (float)(ps->next() % (maxlen.X * 1)) - (float)maxlen.X / 2;
}
// Do not make caves that are above ground.
// It is only necessary to check the startpoint and endpoint.
v3s16 p1 = v3s16(orp.X, orp.Y, orp.Z) + of + rs / 2;
v3s16 p2 = v3s16(vec.X, vec.Y, vec.Z) + p1;
if (isPosAboveSurface(p1) || isPosAboveSurface(p2))
return;
vec += main_direction;
v3f rp = orp + vec;
if (rp.X < 0)
rp.X = 0;
else if (rp.X >= ar.X)
rp.X = ar.X - 1;
if (rp.Y < route_y_min)
rp.Y = route_y_min;
else if (rp.Y >= route_y_max)
rp.Y = route_y_max - 1;
if (rp.Z < 0)
rp.Z = 0;
else if (rp.Z >= ar.Z)
rp.Z = ar.Z - 1;
vec = rp - orp;
float veclen = vec.getLength();
if (veclen < 0.05f)
veclen = 1.0f;
// Every second section is rough
bool randomize_xz = (ps->range(1, 2) == 1);
// Carve routes
for (float f = 0.f; f < 1.0f; f += 1.0f / veclen)
carveRoute(vec, f, randomize_xz);
orp = rp;
}
void CavesRandomWalk::carveRoute(v3f vec, float f, bool randomize_xz)
{
MapNode airnode(CONTENT_AIR);
MapNode waternode(c_water_source);
MapNode lavanode(c_lava_source);
v3s16 startp(orp.X, orp.Y, orp.Z);
startp += of;
float nval = NoisePerlin3D(np_caveliquids, startp.X,
startp.Y, startp.Z, seed);
MapNode liquidnode = (nval < 0.40f && node_max.Y < lava_depth) ?
lavanode : waternode;
v3f fp = orp + vec * f;
fp.X += 0.1f * ps->range(-10, 10);
fp.Z += 0.1f * ps->range(-10, 10);
v3s16 cp(fp.X, fp.Y, fp.Z);
s16 d0 = -rs / 2;
s16 d1 = d0 + rs;
if (randomize_xz) {
d0 += ps->range(-1, 1);
d1 += ps->range(-1, 1);
}
bool flat_cave_floor = !large_cave && ps->range(0, 2) == 2;
for (s16 z0 = d0; z0 <= d1; z0++) {
s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
s16 maxabsxz = MYMAX(abs(x0), abs(z0));
s16 si2 = rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
for (s16 y0 = -si2; y0 <= si2; y0++) {
// Make better floors in small caves
if (flat_cave_floor && y0 <= -rs / 2 && rs <= 7)
continue;
if (large_cave_is_flat) {
// Make large caves not so tall
if (rs > 7 && abs(y0) >= rs / 3)
continue;
}
v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
p += of;
if (!vm->m_area.contains(p))
continue;
u32 i = vm->m_area.index(p);
content_t c = vm->m_data[i].getContent();
if (!ndef->get(c).is_ground_content)
continue;
if (large_cave) {
int full_ymin = node_min.Y - MAP_BLOCKSIZE;
int full_ymax = node_max.Y + MAP_BLOCKSIZE;
if (flooded && full_ymin < water_level && full_ymax > water_level)
vm->m_data[i] = (p.Y <= water_level) ? waternode : airnode;
else if (flooded && full_ymax < water_level)
vm->m_data[i] = (p.Y < startp.Y - 4) ? liquidnode : airnode;
else
vm->m_data[i] = airnode;
} else {
if (c == CONTENT_IGNORE)
continue;
vm->m_data[i] = airnode;
vm->m_flags[i] |= VMANIP_FLAG_CAVE;
}
}
}
}
}
inline bool CavesRandomWalk::isPosAboveSurface(v3s16 p)
{
if (heightmap != NULL &&
p.Z >= node_min.Z && p.Z <= node_max.Z &&
p.X >= node_min.X && p.X <= node_max.X) {
u32 index = (p.Z - node_min.Z) * ystride + (p.X - node_min.X);
if (heightmap[index] < p.Y)
return true;
} else if (p.Y > water_level) {
return true;
}
return false;
}
////
//// CavesV6
////
CavesV6::CavesV6(INodeDefManager *ndef, GenerateNotifier *gennotify,
int water_level, content_t water_source, content_t lava_source)
{
assert(ndef);
this->ndef = ndef;
this->gennotify = gennotify;
this->water_level = water_level;
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 CavesV6::makeCave(MMVManip *vm, v3s16 nmin, v3s16 nmax,
PseudoRandom *ps, PseudoRandom *ps2,
bool is_large_cave, int max_stone_height, s16 *heightmap)
{
assert(vm);
assert(ps);
assert(ps2);
this->vm = vm;
this->ps = ps;
this->ps2 = ps2;
this->node_min = nmin;
this->node_max = nmax;
this->heightmap = heightmap;
this->large_cave = is_large_cave;
this->ystride = nmax.X - nmin.X + 1;
// Set initial parameters from randomness
min_tunnel_diameter = 2;
max_tunnel_diameter = ps->range(2, 6);
int dswitchint = ps->range(1, 14);
if (large_cave) {
part_max_length_rs = ps->range(2, 4);
tunnel_routepoints = ps->range(5, ps->range(15, 30));
min_tunnel_diameter = 5;
max_tunnel_diameter = ps->range(7, ps->range(8, 24));
} else {
part_max_length_rs = ps->range(2, 9);
tunnel_routepoints = ps->range(10, ps->range(15, 30));
}
large_cave_is_flat = (ps->range(0, 1) == 0);
main_direction = v3f(0, 0, 0);
// Allowed route area size in nodes
ar = node_max - node_min + v3s16(1, 1, 1);
// Area starting point in nodes
of = node_min;
// Allow a bit more
//(this should be more than the maximum radius of the tunnel)
const s16 max_spread_amount = MAP_BLOCKSIZE;
const s16 insure = 10;
s16 more = MYMAX(max_spread_amount - max_tunnel_diameter / 2 - insure, 1);
ar += v3s16(1, 0, 1) * more * 2;
of -= v3s16(1, 0, 1) * more;
route_y_min = 0;
// Allow half a diameter + 7 over stone surface
route_y_max = -of.Y + max_stone_height + max_tunnel_diameter / 2 + 7;
// Limit maximum to area
route_y_max = rangelim(route_y_max, 0, ar.Y - 1);
if (large_cave) {
s16 minpos = 0;
if (node_min.Y < water_level && node_max.Y > water_level) {
minpos = water_level - max_tunnel_diameter / 3 - of.Y;
route_y_max = water_level + max_tunnel_diameter / 3 - of.Y;
}
route_y_min = ps->range(minpos, minpos + max_tunnel_diameter);
route_y_min = rangelim(route_y_min, 0, route_y_max);
}
s16 route_start_y_min = route_y_min;
s16 route_start_y_max = route_y_max;
route_start_y_min = rangelim(route_start_y_min, 0, ar.Y - 1);
route_start_y_max = rangelim(route_start_y_max, route_start_y_min, ar.Y - 1);
// Randomize starting position
orp.Z = (float)(ps->next() % ar.Z) + 0.5f;
orp.Y = (float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5f;
orp.X = (float)(ps->next() % ar.X) + 0.5f;
// Add generation notify begin event
if (gennotify != NULL) {
v3s16 abs_pos(of.X + orp.X, of.Y + orp.Y, of.Z + orp.Z);
GenNotifyType notifytype = large_cave ?
GENNOTIFY_LARGECAVE_BEGIN : GENNOTIFY_CAVE_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
if (gennotify != NULL) {
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);
}
}
void CavesV6::makeTunnel(bool dirswitch)
{
if (dirswitch && !large_cave) {
main_direction.Z = ((float)(ps->next() % 20) - (float)10) / 10;
main_direction.Y = ((float)(ps->next() % 20) - (float)10) / 30;
main_direction.X = ((float)(ps->next() % 20) - (float)10) / 10;
main_direction *= (float)ps->range(0, 10) / 10;
}
// Randomize size
s16 min_d = min_tunnel_diameter;
s16 max_d = max_tunnel_diameter;
rs = ps->range(min_d, max_d);
s16 rs_part_max_length_rs = rs * part_max_length_rs;
v3s16 maxlen;
if (large_cave) {
maxlen = v3s16(
rs_part_max_length_rs,
rs_part_max_length_rs / 2,
rs_part_max_length_rs
);
} else {
maxlen = v3s16(
rs_part_max_length_rs,
ps->range(1, rs_part_max_length_rs),
rs_part_max_length_rs
);
}
v3f vec;
vec.Z = (float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2;
vec.Y = (float)(ps->next() % maxlen.Y) - (float)maxlen.Y / 2;
vec.X = (float)(ps->next() % maxlen.X) - (float)maxlen.X / 2;
// Jump downward sometimes
if (!large_cave && ps->range(0, 12) == 0) {
vec.Z = (float)(ps->next() % maxlen.Z) - (float)maxlen.Z / 2;
vec.Y = (float)(ps->next() % (maxlen.Y * 2)) - (float)maxlen.Y;
vec.X = (float)(ps->next() % maxlen.X) - (float)maxlen.X / 2;
}
// Do not make caves that are entirely above ground, to fix shadow bugs
// caused by overgenerated large caves.
// It is only necessary to check the startpoint and endpoint.
v3s16 p1 = v3s16(orp.X, orp.Y, orp.Z) + of + rs / 2;
v3s16 p2 = v3s16(vec.X, vec.Y, vec.Z) + p1;
// If startpoint and endpoint are above ground, disable placement of nodes
// in carveRoute while still running all PseudoRandom calls to ensure caves
// are consistent with existing worlds.
bool tunnel_above_ground =
p1.Y > getSurfaceFromHeightmap(p1) &&
p2.Y > getSurfaceFromHeightmap(p2);
vec += main_direction;
v3f rp = orp + vec;
if (rp.X < 0)
rp.X = 0;
else if (rp.X >= ar.X)
rp.X = ar.X - 1;
if (rp.Y < route_y_min)
rp.Y = route_y_min;
else if (rp.Y >= route_y_max)
rp.Y = route_y_max - 1;
if (rp.Z < 0)
rp.Z = 0;
else if (rp.Z >= ar.Z)
rp.Z = ar.Z - 1;
vec = rp - orp;
float veclen = vec.getLength();
// As odd as it sounds, veclen is *exactly* 0.0 sometimes, causing a FPE
if (veclen < 0.05f)
veclen = 1.0f;
// Every second section is rough
bool randomize_xz = (ps2->range(1, 2) == 1);
// Carve routes
for (float f = 0.f; f < 1.0f; f += 1.0f / veclen)
carveRoute(vec, f, randomize_xz, tunnel_above_ground);
orp = rp;
}
void CavesV6::carveRoute(v3f vec, float f, bool randomize_xz,
bool tunnel_above_ground)
{
MapNode airnode(CONTENT_AIR);
MapNode waternode(c_water_source);
MapNode lavanode(c_lava_source);
v3s16 startp(orp.X, orp.Y, orp.Z);
startp += of;
v3f fp = orp + vec * f;
fp.X += 0.1f * ps->range(-10, 10);
fp.Z += 0.1f * ps->range(-10, 10);
v3s16 cp(fp.X, fp.Y, fp.Z);
s16 d0 = -rs / 2;
s16 d1 = d0 + rs;
if (randomize_xz) {
d0 += ps->range(-1, 1);
d1 += ps->range(-1, 1);
}
for (s16 z0 = d0; z0 <= d1; z0++) {
s16 si = rs / 2 - MYMAX(0, abs(z0) - rs / 7 - 1);
for (s16 x0 = -si - ps->range(0,1); x0 <= si - 1 + ps->range(0,1); x0++) {
if (tunnel_above_ground)
continue;
s16 maxabsxz = MYMAX(abs(x0), abs(z0));
s16 si2 = rs / 2 - MYMAX(0, maxabsxz - rs / 7 - 1);
for (s16 y0 = -si2; y0 <= si2; y0++) {
if (large_cave_is_flat) {
// Make large caves not so tall
if (rs > 7 && abs(y0) >= rs / 3)
continue;
}
v3s16 p(cp.X + x0, cp.Y + y0, cp.Z + z0);
p += of;
if (!vm->m_area.contains(p))
continue;
u32 i = vm->m_area.index(p);
content_t c = vm->m_data[i].getContent();
if (!ndef->get(c).is_ground_content)
continue;
if (large_cave) {
int full_ymin = node_min.Y - MAP_BLOCKSIZE;
int full_ymax = node_max.Y + MAP_BLOCKSIZE;
if (full_ymin < water_level && full_ymax > water_level) {
vm->m_data[i] = (p.Y <= water_level) ? waternode : airnode;
} else if (full_ymax < water_level) {
vm->m_data[i] = (p.Y < startp.Y - 2) ? lavanode : airnode;
} else {
vm->m_data[i] = airnode;
}
} else {
if (c == CONTENT_IGNORE || c == CONTENT_AIR)
continue;
vm->m_data[i] = airnode;
vm->m_flags[i] |= VMANIP_FLAG_CAVE;
}
}
}
}
}
inline s16 CavesV6::getSurfaceFromHeightmap(v3s16 p)
{
if (heightmap != NULL &&
p.Z >= node_min.Z && p.Z <= node_max.Z &&
p.X >= node_min.X && p.X <= node_max.X) {
u32 index = (p.Z - node_min.Z) * ystride + (p.X - node_min.X);
return heightmap[index];
}
return water_level;
}