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) 1986-2016, 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, 2006-2016
  34  */
  35
  36 #include <config.h>
  37
  38 #include <math.h>
  39 #include "budg.h"
  40 #include "chance.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         sea_money[sp->shp_own] += np->nat_money - start_money;
  79         if (!build || np->nat_money != start_money)
  80             k++;
  81         if (player->simulation)
  82             np->nat_money = start_money;
  83     }
  84
  85     return k;
  86 }
  87
  88 static void
  89 upd_ship(struct shpstr *sp, int etus,
  90          struct natstr *np, struct bp *bp, int build)
  91                /* build = 1, maintain = 0 */
  92 {
  93     struct sctstr *sectp;
  94     struct mchrstr *mp;
  95     int pstage, ptime;
  96     int oil_gained;
  97     int max_oil;
  98     int max_food;
  99     struct pchrstr *product;
 100     unsigned char *resource;
 101     int dep;
 102     int n, mult, cost, eff_lost;
 103
 104     mp = &mchr[(int)sp->shp_type];
 105     if (build == 1) {
 106         if (!sp->shp_off && np->nat_money >= 0)
 107             shiprepair(sp, np, bp, etus);
 108         if (!player->simulation)
 109             sp->shp_off = 0;
 110     } else {
 111         mult = 1;
 112         if (np->nat_level[NAT_TLEV] < sp->shp_tech * 0.85)
 113             mult = 2;
 114         cost = -(mult * etus * MIN(0.0, money_ship * mp->m_cost));
 115         if (np->nat_money < cost && !player->simulation) {
 116             eff_lost = etus / 5;
 117             if (sp->shp_effic - eff_lost < SHIP_MINEFF)
 118                 eff_lost = sp->shp_effic - SHIP_MINEFF;
 119             if (eff_lost > 0) {
 120                 wu(0, sp->shp_own, "%s lost %d%% to lack of maintenance\n",
 121                    prship(sp), eff_lost);
 122                 sp->shp_effic -= eff_lost;
 123             }
 124         } else {
 125             np->nat_money -= cost;
 126         }
 127
 128         if (!player->simulation) {
 129             sectp = getsectp(sp->shp_x, sp->shp_y);
 130
 131             /* produce oil */
 132             if (np->nat_money >= 0
 133                 && (mp->m_flags & M_OIL) && sectp->sct_type == SCT_WATER) {
 134                 product = &pchr[dchr[SCT_OIL].d_prd];
 135                 oil_gained = roundavg(total_work(100, etus,
 136                                                  sp->shp_item[I_CIVIL],
 137                                                  sp->shp_item[I_MILIT],
 138                                                  sp->shp_item[I_UW],
 139                                                  ITEM_MAX)
 140                                       * sp->shp_effic / 100.0
 141                                       * sectp->sct_oil / 100.0
 142                                       * prod_eff(SCT_OIL, sp->shp_tech));
 143                 max_oil = mp->m_item[I_OIL];
 144                 if (sp->shp_item[I_OIL] + oil_gained > max_oil)
 145                     oil_gained = max_oil - sp->shp_item[I_OIL];
 146                 if (product->p_nrdep != 0 && oil_gained > 0) {
 147                     resource = (unsigned char *)sectp + product->p_nrndx;
 148                     if (*resource * 100 < product->p_nrdep * oil_gained)
 149                         oil_gained = *resource * 100 / product->p_nrdep;
 150                     dep = roundavg(oil_gained * product->p_nrdep / 100.0);
 151                     if (CANT_HAPPEN(dep > *resource))
 152                         dep = *resource;
 153                     *resource -= dep;
 154                 }
 155                 sp->shp_item[I_OIL] += oil_gained;
 156             }
 157             /* produce fish */
 158             if (np->nat_money >= 0
 159                 && (mp->m_flags & M_FOOD) && sectp->sct_type == SCT_WATER) {
 160                 sp->shp_item[I_FOOD]
 161                     += roundavg(total_work(100, etus,
 162                                            sp->shp_item[I_CIVIL],
 163                                            sp->shp_item[I_MILIT],
 164                                            sp->shp_item[I_UW],
 165                                            ITEM_MAX)
 166                                 * sp->shp_effic / 100.0
 167                                 * sectp->sct_fertil / 100.0
 168                                 * prod_eff(SCT_AGRI, sp->shp_tech));
 169             }
 170             /* feed */
 171             if ((n = feed_ship(sp, etus)) > 0) {
 172                 wu(0, sp->shp_own, "%d starved on %s\n", n, prship(sp));
 173                 if (n > 10)
 174                     nreport(sp->shp_own, N_DIE_FAMINE, 0, 1);
 175             }
 176             max_food = mp->m_item[I_FOOD];
 177             if (sp->shp_item[I_FOOD] > max_food)
 178                 sp->shp_item[I_FOOD] = max_food;
 179             /*
 180              * do plague stuff.  plague can't break out on ships,
 181              * but it can still kill people.
 182              */
 183             pstage = sp->shp_pstage;
 184             ptime = sp->shp_ptime;
 185             if (pstage != PLG_HEALTHY) {
 186                 n = plague_people(np, sp->shp_item, &pstage, &ptime, etus);
 187                 switch (n) {
 188                 case PLG_DYING:
 189                     wu(0, sp->shp_own,
 190                        "PLAGUE deaths reported on %s\n", prship(sp));
 191                     nreport(sp->shp_own, N_DIE_PLAGUE, 0, 1);
 192                     break;
 193                 case PLG_INFECT:
 194                     wu(0, sp->shp_own, "%s battling PLAGUE\n", prship(sp));
 195                     break;
 196                 case PLG_INCUBATE:
 197                     /* Are we still incubating? */
 198                     if (n == pstage) {
 199                         /* Yes. Will it turn "infectious" next time? */
 200                         if (ptime <= etus) {
 201                             /* Yes.  Report an outbreak. */
 202                             wu(0, sp->shp_own,
 203                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 204                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 205                         }
 206                     } else {
 207                         /* It has already moved on to "infectious" */
 208                         wu(0, sp->shp_own,
 209                            "%s battling PLAGUE\n", prship(sp));
 210                     }
 211                     break;
 212                 case PLG_EXPOSED:
 213                     /* Has the plague moved to "incubation" yet? */
 214                     if (n != pstage) {
 215                         /* Yes. Will it turn "infectious" next time? */
 216                         if (ptime <= etus) {
 217                             /* Yes.  Report an outbreak. */
 218                             wu(0, sp->shp_own,
 219                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 220                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 221                         }
 222                     }
 223                     break;
 224                 default:
 225                     break;
 226                 }
 227
 228                 sp->shp_pstage = pstage;
 229                 sp->shp_ptime = ptime;
 230             }
 231             pops[sp->shp_own] += sp->shp_item[I_CIVIL];
 232         }
 233     }
 234 }
 235
 236 /*
 237  * idea is: a sector full of workers can fix up eight
 238  * battleships +8 % eff each etu.  This will cost around
 239  * 8 * 8 * $40 = $2560!
 240  */
 241 static void
 242 shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
 243 {
 244     struct mchrstr *mp = &mchr[(int)ship->shp_type];
 245     int delta;
 246     struct sctstr *sp, scratch_sect;
 247     int build;
 248     int wf;
 249     int avail;
 250     int mult;
 251
 252     if (ship->shp_effic == 100)
 253         return;
 254
 255     sp = getsectp(ship->shp_x, ship->shp_y);
 256     if (sp->sct_off)
 257         return;
 258
 259     if (sp->sct_own != 0
 260         && relations_with(sp->sct_own, ship->shp_own) < FRIENDLY)
 261         return;
 262
 263     if (player->simulation) {
 264         scratch_sect = *sp;
 265         bp_to_sect(bp, &scratch_sect);
 266         sp = &scratch_sect;
 267     }
 268
 269     mult = 1;
 270     if (np->nat_level[NAT_TLEV] < ship->shp_tech * 0.85)
 271         mult = 2;
 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         avail = wf + sp->sct_avail * 100;
 284
 285     delta = roundavg((double)avail / mp->m_bwork);
 286     if (delta <= 0)
 287         return;
 288     if (delta > (int)((float)etus * ship_grow_scale))
 289         delta = (int)((float)etus * ship_grow_scale);
 290     if (delta > 100 - ship->shp_effic)
 291         delta = 100 - ship->shp_effic;
 292
 293     build = get_materials(sp, mp->m_mat, delta);
 294
 295     if (sp->sct_type != SCT_HARBR)
 296         build = delta;
 297
 298     wf -= build * mp->m_bwork;
 299     if (wf < 0) {
 300         /*
 301          * I didn't use roundavg here, because I want to penalize
 302          * the player with a large number of ships.
 303          */
 304         avail = (sp->sct_avail * 100 + wf) / 100;
 305         if (avail < 0)
 306             avail = 0;
 307         sp->sct_avail = avail;
 308     }
 309     if (sp->sct_type != SCT_HARBR)
 310         if ((build + ship->shp_effic) > 80) {
 311             build = 80 - ship->shp_effic;
 312             if (build < 0)
 313                 build = 0;
 314         }
 315
 316     bp_set_from_sect(bp, sp);
 317     np->nat_money -= mult * mp->m_cost * build / 100.0;
 318     if (!player->simulation)
 319         ship->shp_effic += (signed char)build;
 320 }
 321
 322 /*
 323  * returns the number who starved, if any.
 324  */
 325 static int
 326 feed_ship(struct shpstr *sp, int etus)
 327 {
 328     int needed, take;
 329     double give;
 330     struct nstr_item ni;
 331     struct lndstr *lp;
 332
 333     if (opt_NOFOOD)
 334         return 0;
 335
 336     needed = (int)ceil(food_needed(sp->shp_item, etus));
 337
 338     /* scrounge */
 339     if (needed > sp->shp_item[I_FOOD]) {
 340         /* take from embarked land units, but don't starve them */
 341         snxtitem_cargo(&ni, EF_LAND, EF_SHIP, sp->shp_uid);
 342         while ((lp = nxtitemp(&ni)) && needed > sp->shp_item[I_FOOD]) {
 343             give = lp->lnd_item[I_FOOD] - food_needed(lp->lnd_item, etus);
 344             if (give < 1.0)
 345                 continue;
 346             take = MIN((int)give, needed - sp->shp_item[I_FOOD]);
 347             sp->shp_item[I_FOOD] += take;
 348             lp->lnd_item[I_FOOD] -= take;
 349         }
 350     }
 351
 352     return feed_people(sp->shp_item, etus);
 353 }