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) 1986-2014, 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, 2006-2011
  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         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, mult, cost, eff_lost;
 109
 110     mp = &mchr[(int)sp->shp_type];
 111     if (build == 1) {
 112         if (!sp->shp_off && np->nat_money >= 0)
 113             shiprepair(sp, np, bp, etus);
 114         if (!player->simulation)
 115             sp->shp_off = 0;
 116     } else {
 117         mult = 1;
 118         if (np->nat_level[NAT_TLEV] < sp->shp_tech * 0.85)
 119             mult = 2;
 120         cost = -(mult * etus * MIN(0.0, money_ship * mp->m_cost));
 121         if (np->nat_money < cost && !player->simulation) {
 122             eff_lost = etus / 5;
 123             if (sp->shp_effic - eff_lost < SHIP_MINEFF)
 124                 eff_lost = sp->shp_effic - SHIP_MINEFF;
 125             if (eff_lost > 0) {
 126                 wu(0, sp->shp_own, "%s lost %d%% to lack of maintenance\n",
 127                    prship(sp), eff_lost);
 128                 sp->shp_effic -= eff_lost;
 129             }
 130         } else {
 131             np->nat_money -= cost;
 132         }
 133
 134         if (!player->simulation) {
 135             sectp = getsectp(sp->shp_x, sp->shp_y);
 136
 137             /* produce oil */
 138             if (np->nat_money >= 0
 139                 && (mp->m_flags & M_OIL) && sectp->sct_type == SCT_WATER) {
 140                 product = &pchr[dchr[SCT_OIL].d_prd];
 141                 oil_gained = roundavg(total_work(100, etus,
 142                                                  sp->shp_item[I_CIVIL],
 143                                                  sp->shp_item[I_MILIT],
 144                                                  sp->shp_item[I_UW],
 145                                                  ITEM_MAX)
 146                                       * sp->shp_effic / 100.0
 147                                       * sectp->sct_oil / 100.0
 148                                       * prod_eff(SCT_OIL, sp->shp_tech));
 149                 max_oil = mp->m_item[I_OIL];
 150                 if (sp->shp_item[I_OIL] + oil_gained > max_oil)
 151                     oil_gained = max_oil - sp->shp_item[I_OIL];
 152                 if (product->p_nrdep != 0 && oil_gained > 0) {
 153                     resource = (unsigned char *)sectp + product->p_nrndx;
 154                     if (*resource * 100 < product->p_nrdep * oil_gained)
 155                         oil_gained = *resource * 100 / product->p_nrdep;
 156                     dep = roundavg(oil_gained * product->p_nrdep / 100.0);
 157                     if (CANT_HAPPEN(dep > *resource))
 158                         dep = *resource;
 159                     *resource -= dep;
 160                 }
 161                 sp->shp_item[I_OIL] += oil_gained;
 162             }
 163             /* produce fish */
 164             if (np->nat_money >= 0
 165                 && (mp->m_flags & M_FOOD) && sectp->sct_type == SCT_WATER) {
 166                 sp->shp_item[I_FOOD]
 167                     += roundavg(total_work(100, etus,
 168                                            sp->shp_item[I_CIVIL],
 169                                            sp->shp_item[I_MILIT],
 170                                            sp->shp_item[I_UW],
 171                                            ITEM_MAX)
 172                                 * sp->shp_effic / 100.0
 173                                 * sectp->sct_fertil / 100.0
 174                                 * prod_eff(SCT_AGRI, sp->shp_tech));
 175             }
 176             /* feed */
 177             if ((n = feed_ship(sp, etus)) > 0) {
 178                 wu(0, sp->shp_own, "%d starved on %s\n", n, prship(sp));
 179                 if (n > 10)
 180                     nreport(sp->shp_own, N_DIE_FAMINE, 0, 1);
 181             }
 182             max_food = mp->m_item[I_FOOD];
 183             if (sp->shp_item[I_FOOD] > max_food)
 184                 sp->shp_item[I_FOOD] = max_food;
 185             /*
 186              * do plague stuff.  plague can't break out on ships,
 187              * but it can still kill people.
 188              */
 189             pstage = sp->shp_pstage;
 190             ptime = sp->shp_ptime;
 191             if (pstage != PLG_HEALTHY) {
 192                 n = plague_people(np, sp->shp_item, &pstage, &ptime, etus);
 193                 switch (n) {
 194                 case PLG_DYING:
 195                     wu(0, sp->shp_own,
 196                        "PLAGUE deaths reported on %s\n", prship(sp));
 197                     nreport(sp->shp_own, N_DIE_PLAGUE, 0, 1);
 198                     break;
 199                 case PLG_INFECT:
 200                     wu(0, sp->shp_own, "%s battling PLAGUE\n", prship(sp));
 201                     break;
 202                 case PLG_INCUBATE:
 203                     /* Are we still incubating? */
 204                     if (n == pstage) {
 205                         /* Yes. Will it turn "infectious" next time? */
 206                         if (ptime <= etus) {
 207                             /* Yes.  Report an outbreak. */
 208                             wu(0, sp->shp_own,
 209                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 210                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 211                         }
 212                     } else {
 213                         /* It has already moved on to "infectious" */
 214                         wu(0, sp->shp_own,
 215                            "%s battling PLAGUE\n", prship(sp));
 216                     }
 217                     break;
 218                 case PLG_EXPOSED:
 219                     /* Has the plague moved to "incubation" yet? */
 220                     if (n != pstage) {
 221                         /* Yes. Will it turn "infectious" next time? */
 222                         if (ptime <= etus) {
 223                             /* Yes.  Report an outbreak. */
 224                             wu(0, sp->shp_own,
 225                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 226                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 227                         }
 228                     }
 229                     break;
 230                 default:
 231                     break;
 232                 }
 233
 234                 sp->shp_pstage = pstage;
 235                 sp->shp_ptime = ptime;
 236             }
 237             pops[sp->shp_own] += sp->shp_item[I_CIVIL];
 238         }
 239     }
 240 }
 241
 242 /*
 243  * idea is: a sector full of workers can fix up eight
 244  * battleships +8 % eff each etu.  This will cost around
 245  * 8 * 8 * $40 = $2560!
 246  */
 247 static void
 248 shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
 249 {
 250     int delta;
 251     struct sctstr *sp;
 252     struct mchrstr *mp;
 253     int build;
 254     int wf;
 255     int avail;
 256     int w_p_eff;
 257     int mult;
 258     int mvec[I_MAX + 1];
 259
 260     mp = &mchr[(int)ship->shp_type];
 261     sp = getsectp(ship->shp_x, ship->shp_y);
 262
 263     if (sp->sct_own != 0
 264         && relations_with(sp->sct_own, ship->shp_own) < FRIENDLY)
 265         return;
 266
 267     /* only military can work on a military boat */
 268     if (mp->m_glim != 0)
 269         wf = etus * ship->shp_item[I_MILIT] / 2;
 270     else
 271         wf = etus * (ship->shp_item[I_CIVIL] / 2 + ship->shp_item[I_MILIT] / 5);
 272
 273     if (sp->sct_type != SCT_HARBR) {
 274         wf /= 3;
 275         avail = wf;
 276     } else {
 277         if (!player->simulation)
 278             avail = wf + sp->sct_avail * 100;
 279         else
 280             avail = wf + bp_get_avail(bp, sp) * 100;
 281     }
 282
 283     w_p_eff = SHP_BLD_WORK(mp->m_lcm, mp->m_hcm);
 284
 285     if ((sp->sct_off) && (sp->sct_own == ship->shp_own))
 286         return;
 287
 288     mult = 1;
 289     if (np->nat_level[NAT_TLEV] < ship->shp_tech * 0.85)
 290         mult = 2;
 291
 292     if (ship->shp_effic == 100) {
 293         /* ship is ok; no repairs needed */
 294         return;
 295     }
 296
 297     delta = roundavg((double)avail / w_p_eff);
 298     if (delta <= 0)
 299         return;
 300     if (delta > (int)((float)etus * ship_grow_scale))
 301         delta = (int)((float)etus * ship_grow_scale);
 302     if (delta > 100 - ship->shp_effic)
 303         delta = 100 - ship->shp_effic;
 304
 305     memset(mvec, 0, sizeof(mvec));
 306     mvec[I_LCM] = mp->m_lcm;
 307     mvec[I_HCM] = mp->m_hcm;
 308     build = get_materials(sp, bp, mvec, delta);
 309
 310     if (sp->sct_type != SCT_HARBR)
 311         build = delta;
 312
 313     wf -= build * w_p_eff;
 314     if (wf < 0) {
 315         /*
 316          * I didn't use roundavg here, because I want to penalize
 317          * the player with a large number of ships.
 318          */
 319         if (!player->simulation)
 320             avail = (sp->sct_avail * 100 + wf) / 100;
 321         else
 322             avail = (bp_get_avail(bp, sp) * 100 + wf) / 100;
 323         if (avail < 0)
 324             avail = 0;
 325         if (!player->simulation)
 326             sp->sct_avail = avail;
 327         else
 328             bp_put_avail(bp, sp, avail);
 329     }
 330     if (sp->sct_type != SCT_HARBR)
 331         if ((build + ship->shp_effic) > 80) {
 332             build = 80 - ship->shp_effic;
 333             if (build < 0)
 334                 build = 0;
 335         }
 336
 337     np->nat_money -= mult * mp->m_cost * build / 100.0;
 338     if (!player->simulation)
 339         ship->shp_effic += (signed char)build;
 340 }
 341
 342 /*
 343  * returns the number who starved, if any.
 344  */
 345 static int
 346 feed_ship(struct shpstr *sp, int etus)
 347 {
 348     int needed, take;
 349     double give;
 350     struct nstr_item ni;
 351     struct lndstr *lp;
 352
 353     if (opt_NOFOOD)
 354         return 0;
 355
 356     needed = (int)ceil(food_needed(sp->shp_item, etus));
 357
 358     /* scrounge */
 359     if (needed > sp->shp_item[I_FOOD]) {
 360         /* take from embarked land units, but don't starve them */
 361         snxtitem_cargo(&ni, EF_LAND, EF_SHIP, sp->shp_uid);
 362         while ((lp = nxtitemp(&ni)) && needed > sp->shp_item[I_FOOD]) {
 363             give = lp->lnd_item[I_FOOD] - food_needed(lp->lnd_item, etus);
 364             if (give < 1.0)
 365                 continue;
 366             take = MIN((int)give, needed - sp->shp_item[I_FOOD]);
 367             sp->shp_item[I_FOOD] += take;
 368             lp->lnd_item[I_FOOD] -= take;
 369         }
 370     }
 371
 372     return feed_people(sp->shp_item, etus);
 373 }