123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864 |
- /*
- 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 3.0 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);
- 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;
- 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)
- {
- assert(ndef);
- this->ndef = ndef;
- this->gennotify = gennotify;
- this->seed = seed;
- this->water_level = water_level;
- this->np_caveliquids = &nparams_caveliquids;
- this->lava_depth = DEFAULT_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_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) {
- 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) == false)
- 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) == false)
- 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];
- } else {
- return water_level;
- }
- }
|