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) 1986-2008, Dave Pare, Jeff Bailey, Thomas Ruschak,
   4  *                           Ken Stevens, Steve McClure
   5  *
   6  *  This program 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 2 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, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ---
  21  *
  22  *  See files README, COPYING and CREDITS in the root of the source
  23  *  tree for related information and legal notices.  It is expected
  24  *  that future projects/authors will amend these files as needed.
  25  *
  26  *  ---
  27  *
  28  *  ship.c: Do production for ships
  29  *
  30  *  Known contributors to this file:
  31  *     Dave Pare, 1986
  32  *     Steve McClure, 1996
  33  *     Ron Koenderink, 2004
  34  *     Markus Armbruster, 2006-2007
  35  */
  36
  37 #include <config.h>
  38
  39 #include <math.h>
  40 #include "budg.h"
  41 #include "land.h"
  42 #include "lost.h"
  43 #include "news.h"
  44 #include "plague.h"
  45 #include "player.h"
  46 #include "product.h"
  47 #include "ship.h"
  48 #include "update.h"
  49
  50 static void shiprepair(struct shpstr *, struct natstr *, struct bp *, int);
  51 static void upd_ship(struct shpstr *, int, struct natstr *, struct bp *, int);
  52 static int feed_ship(struct shpstr *, int);
  53
  54 int
  55 prod_ship(int etus, int natnum, struct bp *bp, int build)
  56                 /* build = 1, maintain = 0 */
  57 {
  58     struct shpstr *sp;
  59     struct natstr *np;
  60     int n, k = 0;
  61     int start_money;
  62     int lastx = 9999, lasty = 9999;
  63
  64     bp_enable_cachepath();
  65     for (n = 0; NULL != (sp = getshipp(n)); n++) {
  66         if (sp->shp_own == 0)
  67             continue;
  68         if (sp->shp_own != natnum)
  69             continue;
  70         if (sp->shp_effic < SHIP_MINEFF) {
  71             makelost(EF_SHIP, sp->shp_own, sp->shp_uid,
  72                      sp->shp_x, sp->shp_y);
  73             sp->shp_own = 0;
  74             continue;
  75         }
  76
  77         np = getnatp(sp->shp_own);
  78         if (lastx == 9999 || lasty == 9999) {
  79             lastx = sp->shp_x;
  80             lasty = sp->shp_y;
  81         }
  82         if (lastx != sp->shp_x || lasty != sp->shp_y) {
  83             /* Reset the cache */
  84             bp_disable_cachepath();
  85             bp_clear_cachepath();
  86             bp_enable_cachepath();
  87         }
  88         start_money = np->nat_money;
  89         upd_ship(sp, etus, np, bp, build);
  90         if (build && !player->simulation)       /* make sure to only autonav once */
  91             nav_ship(sp);       /* autonav the ship */
  92         sea_money[sp->shp_own] += np->nat_money - start_money;
  93         if (!build || np->nat_money != start_money)
  94             k++;
  95         if (player->simulation)
  96             np->nat_money = start_money;
  97     }
  98     bp_disable_cachepath();
  99     bp_clear_cachepath();
 100
 101     if (opt_SAIL) {
 102         if (build && !player->simulation)       /* make sure to only sail once */
 103             sail_ship(natnum);
 104     }
 105     return k;
 106 }
 107
 108 static void
 109 upd_ship(struct shpstr *sp, int etus,
 110          struct natstr *np, struct bp *bp, int build)
 111                /* build = 1, maintain = 0 */
 112 {
 113     struct sctstr *sectp;
 114     struct mchrstr *mp;
 115     int pstage, ptime;
 116     int oil_gained;
 117     int max_oil;
 118     int max_food;
 119     struct pchrstr *product;
 120     unsigned char *resource;
 121     int dep;
 122     int n;
 123     int mult;
 124     int cost;
 125     int eff;
 126
 127     mp = &mchr[(int)sp->shp_type];
 128     if (build == 1) {
 129         if (!sp->shp_off && np->nat_money >= 0)
 130             shiprepair(sp, np, bp, etus);
 131         if (!player->simulation)
 132             sp->shp_off = 0;
 133     } else {
 134         mult = 1;
 135         if (np->nat_level[NAT_TLEV] < sp->shp_tech * 0.85)
 136             mult = 2;
 137         cost = -(mult * etus * MIN(0.0, money_ship * mp->m_cost));
 138         if (np->nat_money < cost && !player->simulation) {
 139             if ((eff = sp->shp_effic - etus / 5) < SHIP_MINEFF) {
 140                 wu(0, sp->shp_own,
 141                    "%s lost to lack of maintenance\n", prship(sp));
 142                 makelost(EF_SHIP, sp->shp_own, sp->shp_uid,
 143                          sp->shp_x, sp->shp_y);
 144                 sp->shp_own = 0;
 145                 return;
 146             }
 147             wu(0, sp->shp_own,
 148                "%s lost %d%% to lack of maintenance\n",
 149                prship(sp), sp->shp_effic - eff);
 150             sp->shp_effic = eff;
 151         } else {
 152             np->nat_money -= cost;
 153         }
 154
 155         if (!player->simulation) {
 156             sectp = getsectp(sp->shp_x, sp->shp_y);
 157
 158             /* produce oil */
 159             if (np->nat_money >= 0
 160                 && (mp->m_flags & M_OIL) && sectp->sct_type == SCT_WATER) {
 161                 product = &pchr[dchr[SCT_OIL].d_prd];
 162                 oil_gained = roundavg(total_work(100, etus,
 163                                                  sp->shp_item[I_CIVIL],
 164                                                  sp->shp_item[I_MILIT],
 165                                                  sp->shp_item[I_UW],
 166                                                  ITEM_MAX)
 167                                       * sp->shp_effic / 100.0
 168                                       * sectp->sct_oil / 100.0
 169                                       * prod_eff(SCT_OIL, sp->shp_tech));
 170                 max_oil = mp->m_item[I_OIL];
 171                 if (sp->shp_item[I_OIL] + oil_gained > max_oil)
 172                     oil_gained = max_oil - sp->shp_item[I_OIL];
 173                 if (product->p_nrdep != 0 && oil_gained > 0) {
 174                     resource = (unsigned char *)sectp + product->p_nrndx;
 175                     if (*resource * 100 < product->p_nrdep * oil_gained)
 176                         oil_gained = *resource * 100 / product->p_nrdep;
 177                     dep = roundavg(oil_gained * product->p_nrdep / 100.0);
 178                     if (CANT_HAPPEN(dep > *resource))
 179                         dep = *resource;
 180                     *resource -= dep;
 181                 }
 182                 sp->shp_item[I_OIL] += oil_gained;
 183             }
 184             /* produce fish */
 185             if (np->nat_money >= 0
 186                 && (mp->m_flags & M_FOOD) && sectp->sct_type == SCT_WATER) {
 187                 sp->shp_item[I_FOOD]
 188                     += roundavg(total_work(100, etus,
 189                                            sp->shp_item[I_CIVIL],
 190                                            sp->shp_item[I_MILIT],
 191                                            sp->shp_item[I_UW],
 192                                            ITEM_MAX)
 193                                 * sp->shp_effic / 100.0
 194                                 * sectp->sct_fertil / 100.0
 195                                 * prod_eff(SCT_AGRI, sp->shp_tech));
 196             }
 197             /* feed */
 198             if ((n = feed_ship(sp, etus)) > 0) {
 199                 wu(0, sp->shp_own, "%d starved on %s\n", n, prship(sp));
 200                 if (n > 10)
 201                     nreport(sp->shp_own, N_DIE_FAMINE, 0, 1);
 202             }
 203             max_food = mp->m_item[I_FOOD];
 204             if (sp->shp_item[I_FOOD] > max_food)
 205                 sp->shp_item[I_FOOD] = max_food;
 206             /*
 207              * do plague stuff.  plague can't break out on ships,
 208              * but it can still kill people.
 209              */
 210             pstage = sp->shp_pstage;
 211             ptime = sp->shp_ptime;
 212             if (pstage != PLG_HEALTHY) {
 213                 n = plague_people(np, sp->shp_item, &pstage, &ptime, etus);
 214                 switch (n) {
 215                 case PLG_DYING:
 216                     wu(0, sp->shp_own,
 217                        "PLAGUE deaths reported on %s\n", prship(sp));
 218                     nreport(sp->shp_own, N_DIE_PLAGUE, 0, 1);
 219                     break;
 220                 case PLG_INFECT:
 221                     wu(0, sp->shp_own, "%s battling PLAGUE\n", prship(sp));
 222                     break;
 223                 case PLG_INCUBATE:
 224                     /* Are we still incubating? */
 225                     if (n == pstage) {
 226                         /* Yes. Will it turn "infectious" next time? */
 227                         if (ptime <= etus) {
 228                             /* Yes.  Report an outbreak. */
 229                             wu(0, sp->shp_own,
 230                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 231                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 232                         }
 233                     } else {
 234                         /* It has already moved on to "infectious" */
 235                         wu(0, sp->shp_own,
 236                            "%s battling PLAGUE\n", prship(sp));
 237                     }
 238                     break;
 239                 case PLG_EXPOSED:
 240                     /* Has the plague moved to "incubation" yet? */
 241                     if (n != pstage) {
 242                         /* Yes. Will it turn "infectious" next time? */
 243                         if (ptime <= etus) {
 244                             /* Yes.  Report an outbreak. */
 245                             wu(0, sp->shp_own,
 246                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 247                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 248                         }
 249                     }
 250                     break;
 251                 default:
 252                     break;
 253                 }
 254
 255                 sp->shp_pstage = pstage;
 256                 sp->shp_ptime = ptime;
 257             }
 258             pops[sp->shp_own] += sp->shp_item[I_CIVIL];
 259         }
 260     }
 261 }
 262
 263 /*
 264  * idea is: a sector full of workers can fix up eight
 265  * battleships +8 % eff each etu.  This will cost around
 266  * 8 * 8 * $40 = $2560!
 267  */
 268 static void
 269 shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
 270 {
 271     int delta;
 272     struct sctstr *sp;
 273     struct mchrstr *mp;
 274     int build;
 275     int wf;
 276     int avail;
 277     int w_p_eff;
 278     int mult;
 279     int mvec[I_MAX + 1];
 280     int rel;
 281
 282     mp = &mchr[(int)ship->shp_type];
 283     sp = getsectp(ship->shp_x, ship->shp_y);
 284
 285     if ((sp->sct_own != ship->shp_own) && (sp->sct_own != 0)) {
 286         rel = getrel(getnatp(sp->sct_own), ship->shp_own);
 287
 288         if (rel < FRIENDLY)
 289             return;
 290     }
 291
 292     wf = 0;
 293     /* only military can work on a military boat */
 294     if (ship->shp_glim > 0)
 295         wf = etus * ship->shp_item[I_MILIT] / 2;
 296     else
 297         wf = etus * (ship->shp_item[I_CIVIL] / 2 + ship->shp_item[I_MILIT] / 5);
 298
 299     if (sp->sct_type != SCT_HARBR) {
 300         wf /= 3;
 301         avail = wf;
 302     } else {
 303         if (!player->simulation)
 304             avail = wf + sp->sct_avail * 100;
 305         else
 306             avail = wf + bp_get_avail(bp, sp) * 100;
 307     }
 308
 309     w_p_eff = SHP_BLD_WORK(mp->m_lcm, mp->m_hcm);
 310
 311     if ((sp->sct_off) && (sp->sct_own == ship->shp_own))
 312         return;
 313
 314     mult = 1;
 315     if (np->nat_level[NAT_TLEV] < ship->shp_tech * 0.85)
 316         mult = 2;
 317
 318     if (ship->shp_effic == 100) {
 319         /* ship is ok; no repairs needed */
 320         return;
 321     }
 322
 323     delta = roundavg((double)avail / w_p_eff);
 324     if (delta <= 0)
 325         return;
 326     if (delta > (int)((float)etus * ship_grow_scale))
 327         delta = (int)((float)etus * ship_grow_scale);
 328     if (delta > 100 - ship->shp_effic)
 329         delta = 100 - ship->shp_effic;
 330
 331     memset(mvec, 0, sizeof(mvec));
 332     mvec[I_LCM] = mp->m_lcm;
 333     mvec[I_HCM] = mp->m_hcm;
 334     build = get_materials(sp, bp, mvec, delta);
 335
 336     if (sp->sct_type != SCT_HARBR)
 337         build = delta;
 338
 339     wf -= build * w_p_eff;
 340     if (wf < 0) {
 341         /*
 342          * I didn't use roundavg here, because I want to penalize
 343          * the player with a large number of ships.
 344          */
 345         if (!player->simulation)
 346             avail = (sp->sct_avail * 100 + wf) / 100;
 347         else
 348             avail = (bp_get_avail(bp, sp) * 100 + wf) / 100;
 349         if (avail < 0)
 350             avail = 0;
 351         if (!player->simulation)
 352             sp->sct_avail = avail;
 353         else
 354             bp_put_avail(bp, sp, avail);
 355     }
 356     if (sp->sct_type != SCT_HARBR)
 357         if ((build + ship->shp_effic) > 80) {
 358             build = 80 - ship->shp_effic;
 359             if (build < 0)
 360                 build = 0;
 361         }
 362
 363     np->nat_money -= mult * mp->m_cost * build / 100.0;
 364     if (!player->simulation)
 365         ship->shp_effic += (signed char)build;
 366 }
 367
 368 /*
 369  * returns the number who starved, if any.
 370  */
 371 static int
 372 feed_ship(struct shpstr *sp, int etus)
 373 {
 374     int needed, take;
 375     double give;
 376     struct nstr_item ni;
 377     struct lndstr *lp;
 378
 379     if (opt_NOFOOD)
 380         return 0;
 381
 382     needed = (int)ceil(food_needed(sp->shp_item, etus));
 383
 384     /* scrounge */
 385     if (needed > sp->shp_item[I_FOOD])
 386         sp->shp_item[I_FOOD] += supply_commod(sp->shp_own,
 387                                         sp->shp_x, sp->shp_y, I_FOOD,
 388                                         needed - sp->shp_item[I_FOOD]);
 389     if (needed > sp->shp_item[I_FOOD]) {
 390         /* take from embarked land units, but don't starve them */
 391         snxtitem_all(&ni, EF_LAND);
 392         while ((lp = nxtitemp(&ni)) && needed > sp->shp_item[I_FOOD]) {
 393             if (lp->lnd_ship != sp->shp_uid)
 394                 continue;
 395             give = lp->lnd_item[I_FOOD] - food_needed(lp->lnd_item, etus);
 396             if (give < 1.0)
 397                 continue;
 398             take = MIN((int)give, needed - sp->shp_item[I_FOOD]);
 399             sp->shp_item[I_FOOD] += take;
 400             lp->lnd_item[I_FOOD] -= take;
 401         }
 402     }
 403
 404     return feed_people(sp->shp_item, etus);
 405 }