git.pond.sub.org Git - empserver/blob - src/lib/update/ship.c

   1 /*
   2  *  Empire - A multi-player, client/server Internet based war game.
   3  *  Copyright (C) 1986-2011, Dave Pare, Jeff Bailey, Thomas Ruschak,
   4  *                Ken Stevens, Steve McClure, Markus Armbruster
   5  *
   6  *  Empire is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  *  ---
  20  *
  21  *  See files README, COPYING and CREDITS in the root of the source
  22  *  tree for related information and legal notices.  It is expected
  23  *  that future projects/authors will amend these files as needed.
  24  *
  25  *  ---
  26  *
  27  *  ship.c: Do production for ships
  28  *
  29  *  Known contributors to this file:
  30  *     Dave Pare, 1986
  31  *     Steve McClure, 1996
  32  *     Ron Koenderink, 2004
  33  *     Markus Armbruster, 2006-2009
  34  */
  35
  36 #include <config.h>
  37
  38 #include <math.h>
  39 #include "budg.h"
  40 #include "land.h"
  41 #include "lost.h"
  42 #include "news.h"
  43 #include "plague.h"
  44 #include "player.h"
  45 #include "product.h"
  46 #include "ship.h"
  47 #include "update.h"
  48
  49 static void shiprepair(struct shpstr *, struct natstr *, struct bp *, int);
  50 static void upd_ship(struct shpstr *, int, struct natstr *, struct bp *, int);
  51 static int feed_ship(struct shpstr *, int);
  52
  53 int
  54 prod_ship(int etus, int natnum, struct bp *bp, int build)
  55                 /* build = 1, maintain = 0 */
  56 {
  57     struct shpstr *sp;
  58     struct natstr *np;
  59     int n, k = 0;
  60     int start_money;
  61
  62     for (n = 0; NULL != (sp = getshipp(n)); n++) {
  63         if (sp->shp_own == 0)
  64             continue;
  65         if (sp->shp_own != natnum)
  66             continue;
  67         if (sp->shp_effic < SHIP_MINEFF) {
  68             makelost(EF_SHIP, sp->shp_own, sp->shp_uid,
  69                      sp->shp_x, sp->shp_y);
  70             sp->shp_own = 0;
  71             continue;
  72         }
  73
  74         np = getnatp(sp->shp_own);
  75         start_money = np->nat_money;
  76         upd_ship(sp, etus, np, bp, build);
  77         if (build && !player->simulation)       /* make sure to only autonav once */
  78             nav_ship(sp);       /* autonav the ship */
  79         sea_money[sp->shp_own] += np->nat_money - start_money;
  80         if (!build || np->nat_money != start_money)
  81             k++;
  82         if (player->simulation)
  83             np->nat_money = start_money;
  84     }
  85
  86     if (opt_SAIL) {
  87         if (build && !player->simulation)       /* make sure to only sail once */
  88             sail_ship(natnum);
  89     }
  90     return k;
  91 }
  92
  93 static void
  94 upd_ship(struct shpstr *sp, int etus,
  95          struct natstr *np, struct bp *bp, int build)
  96                /* build = 1, maintain = 0 */
  97 {
  98     struct sctstr *sectp;
  99     struct mchrstr *mp;
 100     int pstage, ptime;
 101     int oil_gained;
 102     int max_oil;
 103     int max_food;
 104     struct pchrstr *product;
 105     unsigned char *resource;
 106     int dep;
 107     int n;
 108     int mult;
 109     int cost;
 110     int eff;
 111
 112     mp = &mchr[(int)sp->shp_type];
 113     if (build == 1) {
 114         if (!sp->shp_off && np->nat_money >= 0)
 115             shiprepair(sp, np, bp, etus);
 116         if (!player->simulation)
 117             sp->shp_off = 0;
 118     } else {
 119         mult = 1;
 120         if (np->nat_level[NAT_TLEV] < sp->shp_tech * 0.85)
 121             mult = 2;
 122         cost = -(mult * etus * MIN(0.0, money_ship * mp->m_cost));
 123         if (np->nat_money < cost && !player->simulation) {
 124             if ((eff = sp->shp_effic - etus / 5) < SHIP_MINEFF) {
 125                 wu(0, sp->shp_own,
 126                    "%s lost to lack of maintenance\n", prship(sp));
 127                 makelost(EF_SHIP, sp->shp_own, sp->shp_uid,
 128                          sp->shp_x, sp->shp_y);
 129                 sp->shp_own = 0;
 130                 return;
 131             }
 132             wu(0, sp->shp_own,
 133                "%s lost %d%% to lack of maintenance\n",
 134                prship(sp), sp->shp_effic - eff);
 135             sp->shp_effic = eff;
 136         } else {
 137             np->nat_money -= cost;
 138         }
 139
 140         if (!player->simulation) {
 141             sectp = getsectp(sp->shp_x, sp->shp_y);
 142
 143             /* produce oil */
 144             if (np->nat_money >= 0
 145                 && (mp->m_flags & M_OIL) && sectp->sct_type == SCT_WATER) {
 146                 product = &pchr[dchr[SCT_OIL].d_prd];
 147                 oil_gained = roundavg(total_work(100, etus,
 148                                                  sp->shp_item[I_CIVIL],
 149                                                  sp->shp_item[I_MILIT],
 150                                                  sp->shp_item[I_UW],
 151                                                  ITEM_MAX)
 152                                       * sp->shp_effic / 100.0
 153                                       * sectp->sct_oil / 100.0
 154                                       * prod_eff(SCT_OIL, sp->shp_tech));
 155                 max_oil = mp->m_item[I_OIL];
 156                 if (sp->shp_item[I_OIL] + oil_gained > max_oil)
 157                     oil_gained = max_oil - sp->shp_item[I_OIL];
 158                 if (product->p_nrdep != 0 && oil_gained > 0) {
 159                     resource = (unsigned char *)sectp + product->p_nrndx;
 160                     if (*resource * 100 < product->p_nrdep * oil_gained)
 161                         oil_gained = *resource * 100 / product->p_nrdep;
 162                     dep = roundavg(oil_gained * product->p_nrdep / 100.0);
 163                     if (CANT_HAPPEN(dep > *resource))
 164                         dep = *resource;
 165                     *resource -= dep;
 166                 }
 167                 sp->shp_item[I_OIL] += oil_gained;
 168             }
 169             /* produce fish */
 170             if (np->nat_money >= 0
 171                 && (mp->m_flags & M_FOOD) && sectp->sct_type == SCT_WATER) {
 172                 sp->shp_item[I_FOOD]
 173                     += roundavg(total_work(100, etus,
 174                                            sp->shp_item[I_CIVIL],
 175                                            sp->shp_item[I_MILIT],
 176                                            sp->shp_item[I_UW],
 177                                            ITEM_MAX)
 178                                 * sp->shp_effic / 100.0
 179                                 * sectp->sct_fertil / 100.0
 180                                 * prod_eff(SCT_AGRI, sp->shp_tech));
 181             }
 182             /* feed */
 183             if ((n = feed_ship(sp, etus)) > 0) {
 184                 wu(0, sp->shp_own, "%d starved on %s\n", n, prship(sp));
 185                 if (n > 10)
 186                     nreport(sp->shp_own, N_DIE_FAMINE, 0, 1);
 187             }
 188             max_food = mp->m_item[I_FOOD];
 189             if (sp->shp_item[I_FOOD] > max_food)
 190                 sp->shp_item[I_FOOD] = max_food;
 191             /*
 192              * do plague stuff.  plague can't break out on ships,
 193              * but it can still kill people.
 194              */
 195             pstage = sp->shp_pstage;
 196             ptime = sp->shp_ptime;
 197             if (pstage != PLG_HEALTHY) {
 198                 n = plague_people(np, sp->shp_item, &pstage, &ptime, etus);
 199                 switch (n) {
 200                 case PLG_DYING:
 201                     wu(0, sp->shp_own,
 202                        "PLAGUE deaths reported on %s\n", prship(sp));
 203                     nreport(sp->shp_own, N_DIE_PLAGUE, 0, 1);
 204                     break;
 205                 case PLG_INFECT:
 206                     wu(0, sp->shp_own, "%s battling PLAGUE\n", prship(sp));
 207                     break;
 208                 case PLG_INCUBATE:
 209                     /* Are we still incubating? */
 210                     if (n == pstage) {
 211                         /* Yes. Will it turn "infectious" next time? */
 212                         if (ptime <= etus) {
 213                             /* Yes.  Report an outbreak. */
 214                             wu(0, sp->shp_own,
 215                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 216                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 217                         }
 218                     } else {
 219                         /* It has already moved on to "infectious" */
 220                         wu(0, sp->shp_own,
 221                            "%s battling PLAGUE\n", prship(sp));
 222                     }
 223                     break;
 224                 case PLG_EXPOSED:
 225                     /* Has the plague moved to "incubation" yet? */
 226                     if (n != pstage) {
 227                         /* Yes. Will it turn "infectious" next time? */
 228                         if (ptime <= etus) {
 229                             /* Yes.  Report an outbreak. */
 230                             wu(0, sp->shp_own,
 231                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 232                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 233                         }
 234                     }
 235                     break;
 236                 default:
 237                     break;
 238                 }
 239
 240                 sp->shp_pstage = pstage;
 241                 sp->shp_ptime = ptime;
 242             }
 243             pops[sp->shp_own] += sp->shp_item[I_CIVIL];
 244         }
 245     }
 246 }
 247
 248 /*
 249  * idea is: a sector full of workers can fix up eight
 250  * battleships +8 % eff each etu.  This will cost around
 251  * 8 * 8 * $40 = $2560!
 252  */
 253 static void
 254 shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
 255 {
 256     int delta;
 257     struct sctstr *sp;
 258     struct mchrstr *mp;
 259     int build;
 260     int wf;
 261     int avail;
 262     int w_p_eff;
 263     int mult;
 264     int mvec[I_MAX + 1];
 265
 266     mp = &mchr[(int)ship->shp_type];
 267     sp = getsectp(ship->shp_x, ship->shp_y);
 268
 269     if (sp->sct_own != 0
 270         && relations_with(sp->sct_own, ship->shp_own) < FRIENDLY)
 271         return;
 272
 273     /* only military can work on a military boat */
 274     if (mp->m_glim != 0)
 275         wf = etus * ship->shp_item[I_MILIT] / 2;
 276     else
 277         wf = etus * (ship->shp_item[I_CIVIL] / 2 + ship->shp_item[I_MILIT] / 5);
 278
 279     if (sp->sct_type != SCT_HARBR) {
 280         wf /= 3;
 281         avail = wf;
 282     } else {
 283         if (!player->simulation)
 284             avail = wf + sp->sct_avail * 100;
 285         else
 286             avail = wf + bp_get_avail(bp, sp) * 100;
 287     }
 288
 289     w_p_eff = SHP_BLD_WORK(mp->m_lcm, mp->m_hcm);
 290
 291     if ((sp->sct_off) && (sp->sct_own == ship->shp_own))
 292         return;
 293
 294     mult = 1;
 295     if (np->nat_level[NAT_TLEV] < ship->shp_tech * 0.85)
 296         mult = 2;
 297
 298     if (ship->shp_effic == 100) {
 299         /* ship is ok; no repairs needed */
 300         return;
 301     }
 302
 303     delta = roundavg((double)avail / w_p_eff);
 304     if (delta <= 0)
 305         return;
 306     if (delta > (int)((float)etus * ship_grow_scale))
 307         delta = (int)((float)etus * ship_grow_scale);
 308     if (delta > 100 - ship->shp_effic)
 309         delta = 100 - ship->shp_effic;
 310
 311     memset(mvec, 0, sizeof(mvec));
 312     mvec[I_LCM] = mp->m_lcm;
 313     mvec[I_HCM] = mp->m_hcm;
 314     build = get_materials(sp, bp, mvec, delta);
 315
 316     if (sp->sct_type != SCT_HARBR)
 317         build = delta;
 318
 319     wf -= build * w_p_eff;
 320     if (wf < 0) {
 321         /*
 322          * I didn't use roundavg here, because I want to penalize
 323          * the player with a large number of ships.
 324          */
 325         if (!player->simulation)
 326             avail = (sp->sct_avail * 100 + wf) / 100;
 327         else
 328             avail = (bp_get_avail(bp, sp) * 100 + wf) / 100;
 329         if (avail < 0)
 330             avail = 0;
 331         if (!player->simulation)
 332             sp->sct_avail = avail;
 333         else
 334             bp_put_avail(bp, sp, avail);
 335     }
 336     if (sp->sct_type != SCT_HARBR)
 337         if ((build + ship->shp_effic) > 80) {
 338             build = 80 - ship->shp_effic;
 339             if (build < 0)
 340                 build = 0;
 341         }
 342
 343     np->nat_money -= mult * mp->m_cost * build / 100.0;
 344     if (!player->simulation)
 345         ship->shp_effic += (signed char)build;
 346 }
 347
 348 /*
 349  * returns the number who starved, if any.
 350  */
 351 static int
 352 feed_ship(struct shpstr *sp, int etus)
 353 {
 354     int needed, take;
 355     double give;
 356     struct nstr_item ni;
 357     struct lndstr *lp;
 358
 359     if (opt_NOFOOD)
 360         return 0;
 361
 362     needed = (int)ceil(food_needed(sp->shp_item, etus));
 363
 364     /* scrounge */
 365     if (needed > sp->shp_item[I_FOOD]) {
 366         /* take from embarked land units, but don't starve them */
 367         snxtitem_cargo(&ni, EF_LAND, EF_SHIP, sp->shp_uid);
 368         while ((lp = nxtitemp(&ni)) && needed > sp->shp_item[I_FOOD]) {
 369             give = lp->lnd_item[I_FOOD] - food_needed(lp->lnd_item, etus);
 370             if (give < 1.0)
 371                 continue;
 372             take = MIN((int)give, needed - sp->shp_item[I_FOOD]);
 373             sp->shp_item[I_FOOD] += take;
 374             lp->lnd_item[I_FOOD] -= take;
 375         }
 376     }
 377
 378     return feed_people(sp->shp_item, etus);
 379 }