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) 1986-2010, 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, 2006-2009
  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
  63     for (n = 0; NULL != (sp = getshipp(n)); n++) {
  64         if (sp->shp_own == 0)
  65             continue;
  66         if (sp->shp_own != natnum)
  67             continue;
  68         if (sp->shp_effic < SHIP_MINEFF) {
  69             makelost(EF_SHIP, sp->shp_own, sp->shp_uid,
  70                      sp->shp_x, sp->shp_y);
  71             sp->shp_own = 0;
  72             continue;
  73         }
  74
  75         np = getnatp(sp->shp_own);
  76         start_money = np->nat_money;
  77         upd_ship(sp, etus, np, bp, build);
  78         if (build && !player->simulation)       /* make sure to only autonav once */
  79             nav_ship(sp);       /* autonav the ship */
  80         sea_money[sp->shp_own] += np->nat_money - start_money;
  81         if (!build || np->nat_money != start_money)
  82             k++;
  83         if (player->simulation)
  84             np->nat_money = start_money;
  85     }
  86
  87     if (opt_SAIL) {
  88         if (build && !player->simulation)       /* make sure to only sail once */
  89             sail_ship(natnum);
  90     }
  91     return k;
  92 }
  93
  94 static void
  95 upd_ship(struct shpstr *sp, int etus,
  96          struct natstr *np, struct bp *bp, int build)
  97                /* build = 1, maintain = 0 */
  98 {
  99     struct sctstr *sectp;
 100     struct mchrstr *mp;
 101     int pstage, ptime;
 102     int oil_gained;
 103     int max_oil;
 104     int max_food;
 105     struct pchrstr *product;
 106     unsigned char *resource;
 107     int dep;
 108     int n;
 109     int mult;
 110     int cost;
 111     int eff;
 112
 113     mp = &mchr[(int)sp->shp_type];
 114     if (build == 1) {
 115         if (!sp->shp_off && np->nat_money >= 0)
 116             shiprepair(sp, np, bp, etus);
 117         if (!player->simulation)
 118             sp->shp_off = 0;
 119     } else {
 120         mult = 1;
 121         if (np->nat_level[NAT_TLEV] < sp->shp_tech * 0.85)
 122             mult = 2;
 123         cost = -(mult * etus * MIN(0.0, money_ship * mp->m_cost));
 124         if (np->nat_money < cost && !player->simulation) {
 125             if ((eff = sp->shp_effic - etus / 5) < SHIP_MINEFF) {
 126                 wu(0, sp->shp_own,
 127                    "%s lost to lack of maintenance\n", prship(sp));
 128                 makelost(EF_SHIP, sp->shp_own, sp->shp_uid,
 129                          sp->shp_x, sp->shp_y);
 130                 sp->shp_own = 0;
 131                 return;
 132             }
 133             wu(0, sp->shp_own,
 134                "%s lost %d%% to lack of maintenance\n",
 135                prship(sp), sp->shp_effic - eff);
 136             sp->shp_effic = eff;
 137         } else {
 138             np->nat_money -= cost;
 139         }
 140
 141         if (!player->simulation) {
 142             sectp = getsectp(sp->shp_x, sp->shp_y);
 143
 144             /* produce oil */
 145             if (np->nat_money >= 0
 146                 && (mp->m_flags & M_OIL) && sectp->sct_type == SCT_WATER) {
 147                 product = &pchr[dchr[SCT_OIL].d_prd];
 148                 oil_gained = roundavg(total_work(100, etus,
 149                                                  sp->shp_item[I_CIVIL],
 150                                                  sp->shp_item[I_MILIT],
 151                                                  sp->shp_item[I_UW],
 152                                                  ITEM_MAX)
 153                                       * sp->shp_effic / 100.0
 154                                       * sectp->sct_oil / 100.0
 155                                       * prod_eff(SCT_OIL, sp->shp_tech));
 156                 max_oil = mp->m_item[I_OIL];
 157                 if (sp->shp_item[I_OIL] + oil_gained > max_oil)
 158                     oil_gained = max_oil - sp->shp_item[I_OIL];
 159                 if (product->p_nrdep != 0 && oil_gained > 0) {
 160                     resource = (unsigned char *)sectp + product->p_nrndx;
 161                     if (*resource * 100 < product->p_nrdep * oil_gained)
 162                         oil_gained = *resource * 100 / product->p_nrdep;
 163                     dep = roundavg(oil_gained * product->p_nrdep / 100.0);
 164                     if (CANT_HAPPEN(dep > *resource))
 165                         dep = *resource;
 166                     *resource -= dep;
 167                 }
 168                 sp->shp_item[I_OIL] += oil_gained;
 169             }
 170             /* produce fish */
 171             if (np->nat_money >= 0
 172                 && (mp->m_flags & M_FOOD) && sectp->sct_type == SCT_WATER) {
 173                 sp->shp_item[I_FOOD]
 174                     += roundavg(total_work(100, etus,
 175                                            sp->shp_item[I_CIVIL],
 176                                            sp->shp_item[I_MILIT],
 177                                            sp->shp_item[I_UW],
 178                                            ITEM_MAX)
 179                                 * sp->shp_effic / 100.0
 180                                 * sectp->sct_fertil / 100.0
 181                                 * prod_eff(SCT_AGRI, sp->shp_tech));
 182             }
 183             /* feed */
 184             if ((n = feed_ship(sp, etus)) > 0) {
 185                 wu(0, sp->shp_own, "%d starved on %s\n", n, prship(sp));
 186                 if (n > 10)
 187                     nreport(sp->shp_own, N_DIE_FAMINE, 0, 1);
 188             }
 189             max_food = mp->m_item[I_FOOD];
 190             if (sp->shp_item[I_FOOD] > max_food)
 191                 sp->shp_item[I_FOOD] = max_food;
 192             /*
 193              * do plague stuff.  plague can't break out on ships,
 194              * but it can still kill people.
 195              */
 196             pstage = sp->shp_pstage;
 197             ptime = sp->shp_ptime;
 198             if (pstage != PLG_HEALTHY) {
 199                 n = plague_people(np, sp->shp_item, &pstage, &ptime, etus);
 200                 switch (n) {
 201                 case PLG_DYING:
 202                     wu(0, sp->shp_own,
 203                        "PLAGUE deaths reported on %s\n", prship(sp));
 204                     nreport(sp->shp_own, N_DIE_PLAGUE, 0, 1);
 205                     break;
 206                 case PLG_INFECT:
 207                     wu(0, sp->shp_own, "%s battling PLAGUE\n", prship(sp));
 208                     break;
 209                 case PLG_INCUBATE:
 210                     /* Are we still incubating? */
 211                     if (n == pstage) {
 212                         /* Yes. Will it turn "infectious" next time? */
 213                         if (ptime <= etus) {
 214                             /* Yes.  Report an outbreak. */
 215                             wu(0, sp->shp_own,
 216                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 217                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 218                         }
 219                     } else {
 220                         /* It has already moved on to "infectious" */
 221                         wu(0, sp->shp_own,
 222                            "%s battling PLAGUE\n", prship(sp));
 223                     }
 224                     break;
 225                 case PLG_EXPOSED:
 226                     /* Has the plague moved to "incubation" yet? */
 227                     if (n != pstage) {
 228                         /* Yes. Will it turn "infectious" next time? */
 229                         if (ptime <= etus) {
 230                             /* Yes.  Report an outbreak. */
 231                             wu(0, sp->shp_own,
 232                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 233                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 234                         }
 235                     }
 236                     break;
 237                 default:
 238                     break;
 239                 }
 240
 241                 sp->shp_pstage = pstage;
 242                 sp->shp_ptime = ptime;
 243             }
 244             pops[sp->shp_own] += sp->shp_item[I_CIVIL];
 245         }
 246     }
 247 }
 248
 249 /*
 250  * idea is: a sector full of workers can fix up eight
 251  * battleships +8 % eff each etu.  This will cost around
 252  * 8 * 8 * $40 = $2560!
 253  */
 254 static void
 255 shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
 256 {
 257     int delta;
 258     struct sctstr *sp;
 259     struct mchrstr *mp;
 260     int build;
 261     int wf;
 262     int avail;
 263     int w_p_eff;
 264     int mult;
 265     int mvec[I_MAX + 1];
 266     int rel;
 267
 268     mp = &mchr[(int)ship->shp_type];
 269     sp = getsectp(ship->shp_x, ship->shp_y);
 270
 271     if ((sp->sct_own != ship->shp_own) && (sp->sct_own != 0)) {
 272         rel = getrel(getnatp(sp->sct_own), ship->shp_own);
 273
 274         if (rel < FRIENDLY)
 275             return;
 276     }
 277
 278     wf = 0;
 279     /* only military can work on a military boat */
 280     if (mp->m_glim != 0)
 281         wf = etus * ship->shp_item[I_MILIT] / 2;
 282     else
 283         wf = etus * (ship->shp_item[I_CIVIL] / 2 + ship->shp_item[I_MILIT] / 5);
 284
 285     if (sp->sct_type != SCT_HARBR) {
 286         wf /= 3;
 287         avail = wf;
 288     } else {
 289         if (!player->simulation)
 290             avail = wf + sp->sct_avail * 100;
 291         else
 292             avail = wf + bp_get_avail(bp, sp) * 100;
 293     }
 294
 295     w_p_eff = SHP_BLD_WORK(mp->m_lcm, mp->m_hcm);
 296
 297     if ((sp->sct_off) && (sp->sct_own == ship->shp_own))
 298         return;
 299
 300     mult = 1;
 301     if (np->nat_level[NAT_TLEV] < ship->shp_tech * 0.85)
 302         mult = 2;
 303
 304     if (ship->shp_effic == 100) {
 305         /* ship is ok; no repairs needed */
 306         return;
 307     }
 308
 309     delta = roundavg((double)avail / w_p_eff);
 310     if (delta <= 0)
 311         return;
 312     if (delta > (int)((float)etus * ship_grow_scale))
 313         delta = (int)((float)etus * ship_grow_scale);
 314     if (delta > 100 - ship->shp_effic)
 315         delta = 100 - ship->shp_effic;
 316
 317     memset(mvec, 0, sizeof(mvec));
 318     mvec[I_LCM] = mp->m_lcm;
 319     mvec[I_HCM] = mp->m_hcm;
 320     build = get_materials(sp, bp, mvec, delta);
 321
 322     if (sp->sct_type != SCT_HARBR)
 323         build = delta;
 324
 325     wf -= build * w_p_eff;
 326     if (wf < 0) {
 327         /*
 328          * I didn't use roundavg here, because I want to penalize
 329          * the player with a large number of ships.
 330          */
 331         if (!player->simulation)
 332             avail = (sp->sct_avail * 100 + wf) / 100;
 333         else
 334             avail = (bp_get_avail(bp, sp) * 100 + wf) / 100;
 335         if (avail < 0)
 336             avail = 0;
 337         if (!player->simulation)
 338             sp->sct_avail = avail;
 339         else
 340             bp_put_avail(bp, sp, avail);
 341     }
 342     if (sp->sct_type != SCT_HARBR)
 343         if ((build + ship->shp_effic) > 80) {
 344             build = 80 - ship->shp_effic;
 345             if (build < 0)
 346                 build = 0;
 347         }
 348
 349     np->nat_money -= mult * mp->m_cost * build / 100.0;
 350     if (!player->simulation)
 351         ship->shp_effic += (signed char)build;
 352 }
 353
 354 /*
 355  * returns the number who starved, if any.
 356  */
 357 static int
 358 feed_ship(struct shpstr *sp, int etus)
 359 {
 360     int needed, take;
 361     double give;
 362     struct nstr_item ni;
 363     struct lndstr *lp;
 364
 365     if (opt_NOFOOD)
 366         return 0;
 367
 368     needed = (int)ceil(food_needed(sp->shp_item, etus));
 369
 370     /* scrounge */
 371     if (needed > sp->shp_item[I_FOOD]) {
 372         /* take from embarked land units, but don't starve them */
 373         snxtitem_cargo(&ni, EF_LAND, EF_SHIP, sp->shp_uid);
 374         while ((lp = nxtitemp(&ni)) && needed > sp->shp_item[I_FOOD]) {
 375             give = lp->lnd_item[I_FOOD] - food_needed(lp->lnd_item, etus);
 376             if (give < 1.0)
 377                 continue;
 378             take = MIN((int)give, needed - sp->shp_item[I_FOOD]);
 379             sp->shp_item[I_FOOD] += take;
 380             lp->lnd_item[I_FOOD] -= take;
 381         }
 382     }
 383
 384     return feed_people(sp->shp_item, etus);
 385 }