diff options
Diffstat (limited to 'src/cavegen.cpp')
| -rw-r--r-- | src/cavegen.cpp | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/src/cavegen.cpp b/src/cavegen.cpp new file mode 100644 index 000000000..bef50c7a7 --- /dev/null +++ b/src/cavegen.cpp @@ -0,0 +1,266 @@ +/* +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 "cavegen.h" + + +CaveV6::CaveV6(Mapgen *mg, PseudoRandom *ps, PseudoRandom *ps2, + bool is_large_cave, content_t c_water, content_t c_lava) { + this->vm = mg->vm; + this->water_level = mg->water_level; + this->large_cave = is_large_cave; + this->ps = ps; + this->ps2 = ps2; + this->c_water_source = c_water; + this->c_lava_source = c_lava; + + min_tunnel_diameter = 2; + max_tunnel_diameter = ps->range(2, 6); + dswitchint = ps->range(1, 14); + flooded = true; + + 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); +} + + +void CaveV6::makeCave(v3s16 nmin, v3s16 nmax, int max_stone_height) { + node_min = nmin; + node_max = nmax; + max_stone_y = max_stone_height; + 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; + s16 insure = 10; + s16 more = max_spread_amount - max_tunnel_diameter / 2 - insure; + 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 min = 0; + if (node_min.Y < water_level && node_max.Y > water_level) { + min = water_level - max_tunnel_diameter/3 - of.Y; + route_y_max = water_level + max_tunnel_diameter/3 - of.Y; + } + route_y_min = ps->range(min, min + 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 = v3f( + (float)(ps->next() % ar.X) + 0.5, + (float)(ps->range(route_start_y_min, route_start_y_max)) + 0.5, + (float)(ps->next() % ar.Z) + 0.5 + ); + + // Generate some tunnel starting from orp + for (u16 j = 0; j < tunnel_routepoints; j++) + makeTunnel(j % dswitchint == 0); +} + + +void CaveV6::makeTunnel(bool dirswitch) { + if (dirswitch && !large_cave) { + main_direction = v3f( + ((float)(ps->next() % 20) - (float)10) / 10, + ((float)(ps->next() % 20) - (float)10) / 30, + ((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); + + 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( + (float)(ps->next() % (maxlen.X * 1)) - (float)maxlen.X / 2, + (float)(ps->next() % (maxlen.Y * 1)) - (float)maxlen.Y / 2, + (float)(ps->next() % (maxlen.Z * 1)) - (float)maxlen.Z / 2 + ); + + // Jump downward sometimes + if (!large_cave && ps->range(0, 12) == 0) { + vec = v3f( + (float)(ps->next() % (maxlen.X * 1)) - (float)maxlen.X / 2, + (float)(ps->next() % (maxlen.Y * 2)) - (float)maxlen.Y, + (float)(ps->next() % (maxlen.Z * 1)) - (float)maxlen.Z / 2 + ); + } + + /*if(large_cave){ + v3f p = orp + vec; + s16 h = find_ground_level_clever(vmanip, v2s16(p.X, p.Z), ndef); + route_y_min = h - rs/3; + route_y_max = h + rs; + }*/ + + 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 == 0.0) + veclen = 1.0; + + // Every second section is rough + bool randomize_xz = (ps2->range(1, 2) == 1); + + // Carve routes + for (float f = 0; f < 1.0; f += 1.0 / veclen) + carveRoute(vec, f, randomize_xz); + + orp = rp; +} + + +void CaveV6::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; + + v3f fp = orp + vec * f; + fp.X += 0.1 * ps->range(-10, 10); + fp.Z += 0.1 * 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++) { + 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(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); + + 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 - 2) ? lavanode : airnode; + } else { + vm->m_data[i] = airnode; + } + } else { + // Don't replace air or water or lava or ignore + content_t c = vm->m_data[i].getContent(); + if (c == CONTENT_IGNORE || c == CONTENT_AIR || + c == c_water_source || c == c_lava_source) + continue; + + vm->m_data[i] = airnode; + vm->m_flags[i] |= VMANIP_FLAG_CAVE; + } + } + } + } +} |