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) 1986-2009, 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     bp_disable_cachepath();
  87     bp_clear_cachepath();
  88
  89     if (opt_SAIL) {
  90         if (build && !player->simulation)       /* make sure to only sail once */
  91             sail_ship(natnum);
  92     }
  93     return k;
  94 }
  95
  96 static void
  97 upd_ship(struct shpstr *sp, int etus,
  98          struct natstr *np, struct bp *bp, int build)
  99                /* build = 1, maintain = 0 */
 100 {
 101     struct sctstr *sectp;
 102     struct mchrstr *mp;
 103     int pstage, ptime;
 104     int oil_gained;
 105     int max_oil;
 106     int max_food;
 107     struct pchrstr *product;
 108     unsigned char *resource;
 109     int dep;
 110     int n;
 111     int mult;
 112     int cost;
 113     int eff;
 114
 115     mp = &mchr[(int)sp->shp_type];
 116     if (build == 1) {
 117         if (!sp->shp_off && np->nat_money >= 0)
 118             shiprepair(sp, np, bp, etus);
 119         if (!player->simulation)
 120             sp->shp_off = 0;
 121     } else {
 122         mult = 1;
 123         if (np->nat_level[NAT_TLEV] < sp->shp_tech * 0.85)
 124             mult = 2;
 125         cost = -(mult * etus * MIN(0.0, money_ship * mp->m_cost));
 126         if (np->nat_money < cost && !player->simulation) {
 127             if ((eff = sp->shp_effic - etus / 5) < SHIP_MINEFF) {
 128                 wu(0, sp->shp_own,
 129                    "%s lost to lack of maintenance\n", prship(sp));
 130                 makelost(EF_SHIP, sp->shp_own, sp->shp_uid,
 131                          sp->shp_x, sp->shp_y);
 132                 sp->shp_own = 0;
 133                 return;
 134             }
 135             wu(0, sp->shp_own,
 136                "%s lost %d%% to lack of maintenance\n",
 137                prship(sp), sp->shp_effic - eff);
 138             sp->shp_effic = eff;
 139         } else {
 140             np->nat_money -= cost;
 141         }
 142
 143         if (!player->simulation) {
 144             sectp = getsectp(sp->shp_x, sp->shp_y);
 145
 146             /* produce oil */
 147             if (np->nat_money >= 0
 148                 && (mp->m_flags & M_OIL) && sectp->sct_type == SCT_WATER) {
 149                 product = &pchr[dchr[SCT_OIL].d_prd];
 150                 oil_gained = roundavg(total_work(100, etus,
 151                                                  sp->shp_item[I_CIVIL],
 152                                                  sp->shp_item[I_MILIT],
 153                                                  sp->shp_item[I_UW],
 154                                                  ITEM_MAX)
 155                                       * sp->shp_effic / 100.0
 156                                       * sectp->sct_oil / 100.0
 157                                       * prod_eff(SCT_OIL, sp->shp_tech));
 158                 max_oil = mp->m_item[I_OIL];
 159                 if (sp->shp_item[I_OIL] + oil_gained > max_oil)
 160                     oil_gained = max_oil - sp->shp_item[I_OIL];
 161                 if (product->p_nrdep != 0 && oil_gained > 0) {
 162                     resource = (unsigned char *)sectp + product->p_nrndx;
 163                     if (*resource * 100 < product->p_nrdep * oil_gained)
 164                         oil_gained = *resource * 100 / product->p_nrdep;
 165                     dep = roundavg(oil_gained * product->p_nrdep / 100.0);
 166                     if (CANT_HAPPEN(dep > *resource))
 167                         dep = *resource;
 168                     *resource -= dep;
 169                 }
 170                 sp->shp_item[I_OIL] += oil_gained;
 171             }
 172             /* produce fish */
 173             if (np->nat_money >= 0
 174                 && (mp->m_flags & M_FOOD) && sectp->sct_type == SCT_WATER) {
 175                 sp->shp_item[I_FOOD]
 176                     += roundavg(total_work(100, etus,
 177                                            sp->shp_item[I_CIVIL],
 178                                            sp->shp_item[I_MILIT],
 179                                            sp->shp_item[I_UW],
 180                                            ITEM_MAX)
 181                                 * sp->shp_effic / 100.0
 182                                 * sectp->sct_fertil / 100.0
 183                                 * prod_eff(SCT_AGRI, sp->shp_tech));
 184             }
 185             /* feed */
 186             if ((n = feed_ship(sp, etus)) > 0) {
 187                 wu(0, sp->shp_own, "%d starved on %s\n", n, prship(sp));
 188                 if (n > 10)
 189                     nreport(sp->shp_own, N_DIE_FAMINE, 0, 1);
 190             }
 191             max_food = mp->m_item[I_FOOD];
 192             if (sp->shp_item[I_FOOD] > max_food)
 193                 sp->shp_item[I_FOOD] = max_food;
 194             /*
 195              * do plague stuff.  plague can't break out on ships,
 196              * but it can still kill people.
 197              */
 198             pstage = sp->shp_pstage;
 199             ptime = sp->shp_ptime;
 200             if (pstage != PLG_HEALTHY) {
 201                 n = plague_people(np, sp->shp_item, &pstage, &ptime, etus);
 202                 switch (n) {
 203                 case PLG_DYING:
 204                     wu(0, sp->shp_own,
 205                        "PLAGUE deaths reported on %s\n", prship(sp));
 206                     nreport(sp->shp_own, N_DIE_PLAGUE, 0, 1);
 207                     break;
 208                 case PLG_INFECT:
 209                     wu(0, sp->shp_own, "%s battling PLAGUE\n", prship(sp));
 210                     break;
 211                 case PLG_INCUBATE:
 212                     /* Are we still incubating? */
 213                     if (n == pstage) {
 214                         /* Yes. Will it turn "infectious" next time? */
 215                         if (ptime <= etus) {
 216                             /* Yes.  Report an outbreak. */
 217                             wu(0, sp->shp_own,
 218                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 219                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 220                         }
 221                     } else {
 222                         /* It has already moved on to "infectious" */
 223                         wu(0, sp->shp_own,
 224                            "%s battling PLAGUE\n", prship(sp));
 225                     }
 226                     break;
 227                 case PLG_EXPOSED:
 228                     /* Has the plague moved to "incubation" yet? */
 229                     if (n != pstage) {
 230                         /* Yes. Will it turn "infectious" next time? */
 231                         if (ptime <= etus) {
 232                             /* Yes.  Report an outbreak. */
 233                             wu(0, sp->shp_own,
 234                                "Outbreak of PLAGUE on %s!\n", prship(sp));
 235                             nreport(sp->shp_own, N_OUT_PLAGUE, 0, 1);
 236                         }
 237                     }
 238                     break;
 239                 default:
 240                     break;
 241                 }
 242
 243                 sp->shp_pstage = pstage;
 244                 sp->shp_ptime = ptime;
 245             }
 246             pops[sp->shp_own] += sp->shp_item[I_CIVIL];
 247         }
 248     }
 249 }
 250
 251 /*
 252  * idea is: a sector full of workers can fix up eight
 253  * battleships +8 % eff each etu.  This will cost around
 254  * 8 * 8 * $40 = $2560!
 255  */
 256 static void
 257 shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
 258 {
 259     int delta;
 260     struct sctstr *sp;
 261     struct mchrstr *mp;
 262     int build;
 263     int wf;
 264     int avail;
 265     int w_p_eff;
 266     int mult;
 267     int mvec[I_MAX + 1];
 268     int rel;
 269
 270     mp = &mchr[(int)ship->shp_type];
 271     sp = getsectp(ship->shp_x, ship->shp_y);
 272
 273     if ((sp->sct_own != ship->shp_own) && (sp->sct_own != 0)) {
 274         rel = getrel(getnatp(sp->sct_own), ship->shp_own);
 275
 276         if (rel < FRIENDLY)
 277             return;
 278     }
 279
 280     wf = 0;
 281     /* only military can work on a military boat */
 282     if (mp->m_glim != 0)
 283         wf = etus * ship->shp_item[I_MILIT] / 2;
 284     else
 285         wf = etus * (ship->shp_item[I_CIVIL] / 2 + ship->shp_item[I_MILIT] / 5);
 286
 287     if (sp->sct_type != SCT_HARBR) {
 288         wf /= 3;
 289         avail = wf;
 290     } else {
 291         if (!player->simulation)
 292             avail = wf + sp->sct_avail * 100;
 293         else
 294             avail = wf + bp_get_avail(bp, sp) * 100;
 295     }
 296
 297     w_p_eff = SHP_BLD_WORK(mp->m_lcm, mp->m_hcm);
 298
 299     if ((sp->sct_off) && (sp->sct_own == ship->shp_own))
 300         return;
 301
 302     mult = 1;
 303     if (np->nat_level[NAT_TLEV] < ship->shp_tech * 0.85)
 304         mult = 2;
 305
 306     if (ship->shp_effic == 100) {
 307         /* ship is ok; no repairs needed */
 308         return;
 309     }
 310
 311     delta = roundavg((double)avail / w_p_eff);
 312     if (delta <= 0)
 313         return;
 314     if (delta > (int)((float)etus * ship_grow_scale))
 315         delta = (int)((float)etus * ship_grow_scale);
 316     if (delta > 100 - ship->shp_effic)
 317         delta = 100 - ship->shp_effic;
 318
 319     memset(mvec, 0, sizeof(mvec));
 320     mvec[I_LCM] = mp->m_lcm;
 321     mvec[I_HCM] = mp->m_hcm;
 322     build = get_materials(sp, bp, mvec, delta);
 323
 324     if (sp->sct_type != SCT_HARBR)
 325         build = delta;
 326
 327     wf -= build * w_p_eff;
 328     if (wf < 0) {
 329         /*
 330          * I didn't use roundavg here, because I want to penalize
 331          * the player with a large number of ships.
 332          */
 333         if (!player->simulation)
 334             avail = (sp->sct_avail * 100 + wf) / 100;
 335         else
 336             avail = (bp_get_avail(bp, sp) * 100 + wf) / 100;
 337         if (avail < 0)
 338             avail = 0;
 339         if (!player->simulation)
 340             sp->sct_avail = avail;
 341         else
 342             bp_put_avail(bp, sp, avail);
 343     }
 344     if (sp->sct_type != SCT_HARBR)
 345         if ((build + ship->shp_effic) > 80) {
 346             build = 80 - ship->shp_effic;
 347             if (build < 0)
 348                 build = 0;
 349         }
 350
 351     np->nat_money -= mult * mp->m_cost * build / 100.0;
 352     if (!player->simulation)
 353         ship->shp_effic += (signed char)build;
 354 }
 355
 356 /*
 357  * returns the number who starved, if any.
 358  */
 359 static int
 360 feed_ship(struct shpstr *sp, int etus)
 361 {
 362     int needed, take;
 363     double give;
 364     struct nstr_item ni;
 365     struct lndstr *lp;
 366
 367     if (opt_NOFOOD)
 368         return 0;
 369
 370     needed = (int)ceil(food_needed(sp->shp_item, etus));
 371
 372     /* scrounge */
 373     if (needed > sp->shp_item[I_FOOD]) {
 374         /* take from embarked land units, but don't starve them */
 375         snxtitem_cargo(&ni, EF_LAND, EF_SHIP, sp->shp_uid);
 376         while ((lp = nxtitemp(&ni)) && needed > sp->shp_item[I_FOOD]) {
 377             give = lp->lnd_item[I_FOOD] - food_needed(lp->lnd_item, etus);
 378             if (give < 1.0)
 379                 continue;
 380             take = MIN((int)give, needed - sp->shp_item[I_FOOD]);
 381             sp->shp_item[I_FOOD] += take;
 382             lp->lnd_item[I_FOOD] -= take;
 383         }
 384     }
 385
 386     return feed_people(sp->shp_item, etus);
 387 }