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 "chance.h"
  40 #include "file.h"
  41 #include "land.h"
  42 #include "lost.h"
  43 #include "nat.h"
  44 #include "news.h"
  45 #include "optlist.h"
  46 #include "plague.h"
  47 #include "player.h"
  48 #include "product.h"
  49 #include "prototypes.h"
  50 #include "ship.h"
  51 #include "update.h"
  52
  53 static void upd_ship(struct shpstr *, int, struct bp *, int);
  54 static void shiprepair(struct shpstr *, struct natstr *, struct bp *,
  55                        int, struct budget *);
  56 static int feed_ship(struct shpstr *, int);
  57
  58 void
  59 prod_ship(int etus, int natnum, struct bp *bp, int build)
  60                 /* build = 1, maintain = 0 */
  61 {
  62     struct shpstr *sp;
  63     int i;
  64
  65     for (i = 0; (sp = getshipp(i)); i++) {
  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         upd_ship(sp, etus, bp, build);
  78     }
  79 }
  80
  81 static void
  82 upd_ship(struct shpstr *sp, int etus, struct bp *bp, int build)
  83                /* build = 1, maintain = 0 */
  84 {
  85     struct budget *budget = &nat_budget[sp->shp_own];
  86     struct mchrstr *mp = &mchr[sp->shp_type];
  87     struct natstr *np = getnatp(sp->shp_own);
  88     struct sctstr *sectp;
  89     int pstage, ptime;
  90     int oil_gained;
  91     int max_oil;
  92     int max_food;
  93     struct pchrstr *product;
  94     unsigned char *resource;
  95     int dep;
  96     int n, mult, eff_lost;
  97     double cost;
  98
  99     if (build == 1) {
 100         if (!sp->shp_off && budget->money >= 0)
 101             shiprepair(sp, np, bp, etus, budget);
 102         if (!player->simulation)
 103             sp->shp_off = 0;
 104     } else {
 105         budget->oldowned_civs += sp->shp_item[I_CIVIL];
 106         mult = 1;
 107         if (np->nat_level[NAT_TLEV] < sp->shp_tech * 0.85)
 108             mult = 2;
 109         budget->bm[BUDG_SHP_MAINT].count++;
 110         cost = mult * etus * -money_ship * mp->m_cost;
 111         if (budget->money < cost && !player->simulation) {
 112             eff_lost = etus / 5;
 113             if (sp->shp_effic - eff_lost < SHIP_MINEFF)
 114                 eff_lost = sp->shp_effic - SHIP_MINEFF;
 115             if (eff_lost > 0) {
 116                 wu(0, sp->shp_own, "%s lost %d%% to lack of maintenance\n",
 117                    prship(sp), eff_lost);
 118                 sp->shp_effic -= eff_lost;
 119             }
 120         } else {
 121             budget->bm[BUDG_SHP_MAINT].money -= cost;
 122             budget->money -= cost;
 123         }
 124
 125         if (!player->simulation) {
 126             sectp = getsectp(sp->shp_x, sp->shp_y);
 127
 128             /* produce oil */
 129             if (budget->money >= 0
 130                 && (mp->m_flags & M_OIL) && sectp->sct_type == SCT_WATER) {
 131                 product = &pchr[dchr[SCT_OIL].d_prd];
 132                 oil_gained = roundavg(total_work(100, etus,
 133                                                  sp->shp_item[I_CIVIL],
 134                                                  sp->shp_item[I_MILIT],
 135                                                  sp->shp_item[I_UW],
 136                                                  ITEM_MAX)
 137                                       * sp->shp_effic / 100.0
 138                                       * sectp->sct_oil / 100.0
 139                                       * prod_eff(SCT_OIL, sp->shp_tech));
 140                 max_oil = mp->m_item[I_OIL];
 141                 if (sp->shp_item[I_OIL] + oil_gained > max_oil)
 142                     oil_gained = max_oil - sp->shp_item[I_OIL];
 143                 if (product->p_nrdep != 0 && oil_gained > 0) {
 144                     resource = (unsigned char *)sectp + product->p_nrndx;
 145                     if (*resource * 100 < product->p_nrdep * oil_gained)
 146                         oil_gained = *resource * 100 / product->p_nrdep;
 147                     dep = roundavg(oil_gained * product->p_nrdep / 100.0);
 148                     if (CANT_HAPPEN(dep > *resource))
 149                         dep = *resource;
 150                     *resource -= dep;
 151                 }
 152                 sp->shp_item[I_OIL] += oil_gained;
 153             }
 154             /* produce fish */
 155             if (budget->money >= 0
 156                 && (mp->m_flags & M_FOOD) && sectp->sct_type == SCT_WATER) {
 157                 sp->shp_item[I_FOOD]
 158                     += roundavg(total_work(100, etus,
 159                                            sp->shp_item[I_CIVIL],
 160                                            sp->shp_item[I_MILIT],
 161                                            sp->shp_item[I_UW],
 162                                            ITEM_MAX)
 163                                 * sp->shp_effic / 100.0
 164                                 * sectp->sct_fertil / 100.0
 165                                 * prod_eff(SCT_AGRI, sp->shp_tech));
 166             }
 167             /* feed */
 168             if ((n = feed_ship(sp, etus)) > 0) {
 169                 wu(0, sp->shp_own, "%d starved on %s\n", n, prship(sp));
 170                 if (n > 10)
 171                     nreport(sp->shp_own, N_DIE_FAMINE, 0, 1);
 172             }
 173             max_food = mp->m_item[I_FOOD];
 174             if (sp->shp_item[I_FOOD] > max_food)
 175                 sp->shp_item[I_FOOD] = max_food;
 176             /*
 177              * do plague stuff.  plague can't break out on ships,
 178              * but it can still kill people.
 179              */
 180             pstage = sp->shp_pstage;
 181             ptime = sp->shp_ptime;
 182             if (pstage != PLG_HEALTHY) {
 183                 n = plague_people(np, sp->shp_item, &pstage, &ptime, etus);
 184                 switch (n) {
 185                 case PLG_DYING:
 186                     wu(0, sp->shp_own,
 187                        "PLAGUE deaths reported on %s\n", prship(sp));
 188                     nreport(sp->shp_own, N_DIE_PLAGUE, 0, 1);
 189                     break;
 190                 case PLG_INFECT:
 191                     wu(0, sp->shp_own, "%s battling PLAGUE\n", prship(sp));
 192                     break;
 193                 case PLG_INCUBATE:
 194                     /* Are we still incubating? */
 195                     if (n == pstage) {
 196                         /* Yes. Will it turn "infectious" next time? */
 197                         if (ptime <= etus) {
 198                             /* Yes.  Report an outbreak. */
 199                             wu(0, sp->shp_own,
 200                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 201                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 202                         }
 203                     } else {
 204                         /* It has already moved on to "infectious" */
 205                         wu(0, sp->shp_own,
 206                            "%s battling PLAGUE\n", prship(sp));
 207                     }
 208                     break;
 209                 case PLG_EXPOSED:
 210                     /* Has the plague moved to "incubation" yet? */
 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                     }
 220                     break;
 221                 default:
 222                     break;
 223                 }
 224
 225                 sp->shp_pstage = pstage;
 226                 sp->shp_ptime = ptime;
 227             }
 228         }
 229     }
 230 }
 231
 232 /*
 233  * idea is: a sector full of workers can fix up eight
 234  * battleships +8 % eff each etu.  This will cost around
 235  * 8 * 8 * $40 = $2560!
 236  */
 237 static void
 238 shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus,
 239            struct budget *budget)
 240 {
 241     struct mchrstr *mp = &mchr[(int)ship->shp_type];
 242     int delta;
 243     struct sctstr *sp, scratch_sect;
 244     int build;
 245     int wf;
 246     int avail;
 247     int mult;
 248     double cost;
 249
 250     if (ship->shp_effic == 100)
 251         return;
 252
 253     sp = getsectp(ship->shp_x, ship->shp_y);
 254     if (sp->sct_off)
 255         return;
 256
 257     if (sp->sct_own != 0
 258         && relations_with(sp->sct_own, ship->shp_own) < FRIENDLY)
 259         return;
 260
 261     if (player->simulation) {
 262         scratch_sect = *sp;
 263         bp_to_sect(bp, &scratch_sect);
 264         sp = &scratch_sect;
 265     }
 266
 267     mult = 1;
 268     if (np->nat_level[NAT_TLEV] < ship->shp_tech * 0.85)
 269         mult = 2;
 270
 271     /* only military can work on a military boat */
 272     if (mp->m_glim != 0)
 273         wf = etus * ship->shp_item[I_MILIT] / 2;
 274     else
 275         wf = etus * (ship->shp_item[I_CIVIL] / 2 + ship->shp_item[I_MILIT] / 5);
 276
 277     if (sp->sct_type != SCT_HARBR) {
 278         wf /= 3;
 279         avail = wf;
 280     } else
 281         avail = wf + sp->sct_avail * 100;
 282
 283     delta = avail / mp->m_bwork;
 284     if (delta <= 0)
 285         return;
 286     if (delta > (int)((float)etus * ship_grow_scale))
 287         delta = (int)((float)etus * ship_grow_scale);
 288     if (delta > 100 - ship->shp_effic)
 289         delta = 100 - ship->shp_effic;
 290
 291     build = get_materials(sp, mp->m_mat, delta);
 292
 293     if (sp->sct_type != SCT_HARBR)
 294         build = delta;
 295
 296     wf -= build * mp->m_bwork;
 297     if (wf < 0) {
 298         avail = roundavg((sp->sct_avail * 100 + wf) / 100.0);
 299         if (avail < 0)
 300             avail = 0;
 301         sp->sct_avail = avail;
 302     }
 303     if (sp->sct_type != SCT_HARBR)
 304         if ((build + ship->shp_effic) > 80) {
 305             build = 80 - ship->shp_effic;
 306             if (build < 0)
 307                 build = 0;
 308         }
 309
 310     bp_set_from_sect(bp, sp);
 311     cost = mult * mp->m_cost * build / 100.0;
 312     budget->bm[BUDG_SHP_BUILD].count += !!build;
 313     budget->bm[BUDG_SHP_BUILD].money -= cost;
 314     budget->money -= cost;
 315     if (!player->simulation)
 316         ship->shp_effic += (signed char)build;
 317 }
 318
 319 /*
 320  * returns the number who starved, if any.
 321  */
 322 static int
 323 feed_ship(struct shpstr *sp, int etus)
 324 {
 325     int needed, take;
 326     double give;
 327     struct nstr_item ni;
 328     struct lndstr *lp;
 329
 330     if (opt_NOFOOD)
 331         return 0;
 332
 333     needed = (int)ceil(food_needed(sp->shp_item, etus));
 334
 335     /* scrounge */
 336     if (needed > sp->shp_item[I_FOOD]) {
 337         /* take from embarked land units, but don't starve them */
 338         snxtitem_cargo(&ni, EF_LAND, EF_SHIP, sp->shp_uid);
 339         while ((lp = nxtitemp(&ni)) && needed > sp->shp_item[I_FOOD]) {
 340             give = lp->lnd_item[I_FOOD] - food_needed(lp->lnd_item, etus);
 341             if (give < 1.0)
 342                 continue;
 343             take = MIN((int)give, needed - sp->shp_item[I_FOOD]);
 344             sp->shp_item[I_FOOD] += take;
 345             lp->lnd_item[I_FOOD] -= take;
 346         }
 347     }
 348
 349     return feed_people(sp->shp_item, etus);
 350 }