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 shiprepair(struct shpstr *, struct natstr *, struct bp *, int);
  54 static void upd_ship(struct shpstr *, int, struct natstr *, struct bp *, int);
  55 static int feed_ship(struct shpstr *, int);
  56
  57 int
  58 prod_ship(int etus, int natnum, struct bp *bp, int build)
  59                 /* build = 1, maintain = 0 */
  60 {
  61     struct shpstr *sp;
  62     struct natstr *np;
  63     int n, k = 0;
  64     int start_money;
  65
  66     for (n = 0; NULL != (sp = getshipp(n)); n++) {
  67         if (sp->shp_own == 0)
  68             continue;
  69         if (sp->shp_own != natnum)
  70             continue;
  71         if (sp->shp_effic < SHIP_MINEFF) {
  72             makelost(EF_SHIP, sp->shp_own, sp->shp_uid,
  73                      sp->shp_x, sp->shp_y);
  74             sp->shp_own = 0;
  75             continue;
  76         }
  77
  78         np = getnatp(sp->shp_own);
  79         start_money = np->nat_money;
  80         upd_ship(sp, etus, np, bp, build);
  81         sea_money[sp->shp_own] += np->nat_money - start_money;
  82         if (!build || np->nat_money != start_money)
  83             k++;
  84         if (player->simulation)
  85             np->nat_money = start_money;
  86     }
  87
  88     return k;
  89 }
  90
  91 static void
  92 upd_ship(struct shpstr *sp, int etus,
  93          struct natstr *np, struct bp *bp, int build)
  94                /* build = 1, maintain = 0 */
  95 {
  96     struct sctstr *sectp;
  97     struct mchrstr *mp;
  98     int pstage, ptime;
  99     int oil_gained;
 100     int max_oil;
 101     int max_food;
 102     struct pchrstr *product;
 103     unsigned char *resource;
 104     int dep;
 105     int n, mult, cost, eff_lost;
 106
 107     mp = &mchr[(int)sp->shp_type];
 108     if (build == 1) {
 109         if (!sp->shp_off && np->nat_money >= 0)
 110             shiprepair(sp, np, bp, etus);
 111         if (!player->simulation)
 112             sp->shp_off = 0;
 113     } else {
 114         mult = 1;
 115         if (np->nat_level[NAT_TLEV] < sp->shp_tech * 0.85)
 116             mult = 2;
 117         cost = -(mult * etus * MIN(0.0, money_ship * mp->m_cost));
 118         if (np->nat_money < cost && !player->simulation) {
 119             eff_lost = etus / 5;
 120             if (sp->shp_effic - eff_lost < SHIP_MINEFF)
 121                 eff_lost = sp->shp_effic - SHIP_MINEFF;
 122             if (eff_lost > 0) {
 123                 wu(0, sp->shp_own, "%s lost %d%% to lack of maintenance\n",
 124                    prship(sp), eff_lost);
 125                 sp->shp_effic -= eff_lost;
 126             }
 127         } else {
 128             np->nat_money -= cost;
 129         }
 130
 131         if (!player->simulation) {
 132             sectp = getsectp(sp->shp_x, sp->shp_y);
 133
 134             /* produce oil */
 135             if (np->nat_money >= 0
 136                 && (mp->m_flags & M_OIL) && sectp->sct_type == SCT_WATER) {
 137                 product = &pchr[dchr[SCT_OIL].d_prd];
 138                 oil_gained = roundavg(total_work(100, etus,
 139                                                  sp->shp_item[I_CIVIL],
 140                                                  sp->shp_item[I_MILIT],
 141                                                  sp->shp_item[I_UW],
 142                                                  ITEM_MAX)
 143                                       * sp->shp_effic / 100.0
 144                                       * sectp->sct_oil / 100.0
 145                                       * prod_eff(SCT_OIL, sp->shp_tech));
 146                 max_oil = mp->m_item[I_OIL];
 147                 if (sp->shp_item[I_OIL] + oil_gained > max_oil)
 148                     oil_gained = max_oil - sp->shp_item[I_OIL];
 149                 if (product->p_nrdep != 0 && oil_gained > 0) {
 150                     resource = (unsigned char *)sectp + product->p_nrndx;
 151                     if (*resource * 100 < product->p_nrdep * oil_gained)
 152                         oil_gained = *resource * 100 / product->p_nrdep;
 153                     dep = roundavg(oil_gained * product->p_nrdep / 100.0);
 154                     if (CANT_HAPPEN(dep > *resource))
 155                         dep = *resource;
 156                     *resource -= dep;
 157                 }
 158                 sp->shp_item[I_OIL] += oil_gained;
 159             }
 160             /* produce fish */
 161             if (np->nat_money >= 0
 162                 && (mp->m_flags & M_FOOD) && sectp->sct_type == SCT_WATER) {
 163                 sp->shp_item[I_FOOD]
 164                     += roundavg(total_work(100, etus,
 165                                            sp->shp_item[I_CIVIL],
 166                                            sp->shp_item[I_MILIT],
 167                                            sp->shp_item[I_UW],
 168                                            ITEM_MAX)
 169                                 * sp->shp_effic / 100.0
 170                                 * sectp->sct_fertil / 100.0
 171                                 * prod_eff(SCT_AGRI, sp->shp_tech));
 172             }
 173             /* feed */
 174             if ((n = feed_ship(sp, etus)) > 0) {
 175                 wu(0, sp->shp_own, "%d starved on %s\n", n, prship(sp));
 176                 if (n > 10)
 177                     nreport(sp->shp_own, N_DIE_FAMINE, 0, 1);
 178             }
 179             max_food = mp->m_item[I_FOOD];
 180             if (sp->shp_item[I_FOOD] > max_food)
 181                 sp->shp_item[I_FOOD] = max_food;
 182             /*
 183              * do plague stuff.  plague can't break out on ships,
 184              * but it can still kill people.
 185              */
 186             pstage = sp->shp_pstage;
 187             ptime = sp->shp_ptime;
 188             if (pstage != PLG_HEALTHY) {
 189                 n = plague_people(np, sp->shp_item, &pstage, &ptime, etus);
 190                 switch (n) {
 191                 case PLG_DYING:
 192                     wu(0, sp->shp_own,
 193                        "PLAGUE deaths reported on %s\n", prship(sp));
 194                     nreport(sp->shp_own, N_DIE_PLAGUE, 0, 1);
 195                     break;
 196                 case PLG_INFECT:
 197                     wu(0, sp->shp_own, "%s battling PLAGUE\n", prship(sp));
 198                     break;
 199                 case PLG_INCUBATE:
 200                     /* Are we still incubating? */
 201                     if (n == pstage) {
 202                         /* Yes. Will it turn "infectious" next time? */
 203                         if (ptime <= etus) {
 204                             /* Yes.  Report an outbreak. */
 205                             wu(0, sp->shp_own,
 206                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 207                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 208                         }
 209                     } else {
 210                         /* It has already moved on to "infectious" */
 211                         wu(0, sp->shp_own,
 212                            "%s battling PLAGUE\n", prship(sp));
 213                     }
 214                     break;
 215                 case PLG_EXPOSED:
 216                     /* Has the plague moved to "incubation" yet? */
 217                     if (n != pstage) {
 218                         /* Yes. Will it turn "infectious" next time? */
 219                         if (ptime <= etus) {
 220                             /* Yes.  Report an outbreak. */
 221                             wu(0, sp->shp_own,
 222                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 223                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 224                         }
 225                     }
 226                     break;
 227                 default:
 228                     break;
 229                 }
 230
 231                 sp->shp_pstage = pstage;
 232                 sp->shp_ptime = ptime;
 233             }
 234             pops[sp->shp_own] += sp->shp_item[I_CIVIL];
 235         }
 236     }
 237 }
 238
 239 /*
 240  * idea is: a sector full of workers can fix up eight
 241  * battleships +8 % eff each etu.  This will cost around
 242  * 8 * 8 * $40 = $2560!
 243  */
 244 static void
 245 shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
 246 {
 247     struct mchrstr *mp = &mchr[(int)ship->shp_type];
 248     int delta;
 249     struct sctstr *sp, scratch_sect;
 250     int build;
 251     int wf;
 252     int avail;
 253     int mult;
 254
 255     if (ship->shp_effic == 100)
 256         return;
 257
 258     sp = getsectp(ship->shp_x, ship->shp_y);
 259     if (sp->sct_off)
 260         return;
 261
 262     if (sp->sct_own != 0
 263         && relations_with(sp->sct_own, ship->shp_own) < FRIENDLY)
 264         return;
 265
 266     if (player->simulation) {
 267         scratch_sect = *sp;
 268         bp_to_sect(bp, &scratch_sect);
 269         sp = &scratch_sect;
 270     }
 271
 272     mult = 1;
 273     if (np->nat_level[NAT_TLEV] < ship->shp_tech * 0.85)
 274         mult = 2;
 275
 276     /* only military can work on a military boat */
 277     if (mp->m_glim != 0)
 278         wf = etus * ship->shp_item[I_MILIT] / 2;
 279     else
 280         wf = etus * (ship->shp_item[I_CIVIL] / 2 + ship->shp_item[I_MILIT] / 5);
 281
 282     if (sp->sct_type != SCT_HARBR) {
 283         wf /= 3;
 284         avail = wf;
 285     } else
 286         avail = wf + sp->sct_avail * 100;
 287
 288     delta = avail / mp->m_bwork;
 289     if (delta <= 0)
 290         return;
 291     if (delta > (int)((float)etus * ship_grow_scale))
 292         delta = (int)((float)etus * ship_grow_scale);
 293     if (delta > 100 - ship->shp_effic)
 294         delta = 100 - ship->shp_effic;
 295
 296     build = get_materials(sp, mp->m_mat, delta);
 297
 298     if (sp->sct_type != SCT_HARBR)
 299         build = delta;
 300
 301     wf -= build * mp->m_bwork;
 302     if (wf < 0) {
 303         avail = roundavg((sp->sct_avail * 100 + wf) / 100.0);
 304         if (avail < 0)
 305             avail = 0;
 306         sp->sct_avail = avail;
 307     }
 308     if (sp->sct_type != SCT_HARBR)
 309         if ((build + ship->shp_effic) > 80) {
 310             build = 80 - ship->shp_effic;
 311             if (build < 0)
 312                 build = 0;
 313         }
 314
 315     bp_set_from_sect(bp, sp);
 316     np->nat_money -= roundavg(mult * mp->m_cost * build / 100.0);
 317     if (!player->simulation)
 318         ship->shp_effic += (signed char)build;
 319 }
 320
 321 /*
 322  * returns the number who starved, if any.
 323  */
 324 static int
 325 feed_ship(struct shpstr *sp, int etus)
 326 {
 327     int needed, take;
 328     double give;
 329     struct nstr_item ni;
 330     struct lndstr *lp;
 331
 332     if (opt_NOFOOD)
 333         return 0;
 334
 335     needed = (int)ceil(food_needed(sp->shp_item, etus));
 336
 337     /* scrounge */
 338     if (needed > sp->shp_item[I_FOOD]) {
 339         /* take from embarked land units, but don't starve them */
 340         snxtitem_cargo(&ni, EF_LAND, EF_SHIP, sp->shp_uid);
 341         while ((lp = nxtitemp(&ni)) && needed > sp->shp_item[I_FOOD]) {
 342             give = lp->lnd_item[I_FOOD] - food_needed(lp->lnd_item, etus);
 343             if (give < 1.0)
 344                 continue;
 345             take = MIN((int)give, needed - sp->shp_item[I_FOOD]);
 346             sp->shp_item[I_FOOD] += take;
 347             lp->lnd_item[I_FOOD] -= take;
 348         }
 349     }
 350
 351     return feed_people(sp->shp_item, etus);
 352 }