838 lines
22 KiB
C
838 lines
22 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2010, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ---
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*
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* See files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* aircombat.c: Deal with air to air combat
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*
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* Known contributors to this file:
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* Dave Pare, 1986
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* Thomas Ruschak, 1992
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* Steve McClure, 1996
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* Markus Armbruster, 2006-2009
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*/
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#include <config.h>
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#include "file.h"
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#include "land.h"
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#include "map.h"
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#include "misc.h"
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#include "mission.h"
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#include "nat.h"
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#include "news.h"
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#include "nsc.h"
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#include "optlist.h"
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#include "path.h"
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#include "plane.h"
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#include "player.h"
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#include "prototypes.h"
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#include "sect.h"
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#include "ship.h"
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#include "xy.h"
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#define FLAK_GUN_MAX 14
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static void sam_intercept(struct emp_qelem *, struct emp_qelem *,
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natid, natid, coord, coord, int);
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static void ac_intercept(struct emp_qelem *, struct emp_qelem *,
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struct emp_qelem *, natid, coord, coord, int);
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static void ac_combat_headers(natid, natid);
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static void ac_airtoair(struct emp_qelem *, struct emp_qelem *);
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static void ac_dog(struct plist *, struct plist *);
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static void ac_planedamage(struct plist *, natid, int, natid, int,
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int, char *);
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static void ac_doflak(struct emp_qelem *, struct sctstr *);
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static void ac_landflak(struct emp_qelem *, coord, coord);
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static void ac_shipflak(struct emp_qelem *, coord, coord);
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static void ac_fireflak(struct emp_qelem *, natid, int);
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static void getilists(struct emp_qelem *, unsigned char *, natid);
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static int do_evade(struct emp_qelem *, struct emp_qelem *);
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void
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ac_encounter(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
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coord x, coord y, char *path, int mission_flags)
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{
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int val;
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int dir;
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unsigned char gotships[MAXNOC];
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unsigned char gotlands[MAXNOC];
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unsigned char rel[MAXNOC];
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int overfly[MAXNOC];
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int flags;
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struct emp_qelem ilist[MAXNOC];
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natid plane_owner;
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struct sctstr sect;
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struct shpstr ship;
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struct lndstr land;
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struct nstr_item ni;
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natid cn;
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struct plist *plp;
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int evaded;
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struct shiplist *head = NULL;
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int changed = 0;
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/* We want to only intercept once per sector per owner. So, if we overfly
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a sector, and then overfly some land units or ships, we don't want to
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potentially intercept 3 times. */
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plp = (struct plist *)bomb_list->q_forw;
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plane_owner = plp->plane.pln_own;
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memset(overfly, 0, sizeof(overfly));
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getilists(ilist, rel, plane_owner);
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if (CANT_HAPPEN(mission_flags && plane_owner != player->cnum))
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mission_flags = 0;
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if (mission_flags & PM_R) {
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flags = pln_caps(bomb_list);
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if (flags & P_S) {
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pr("\nSPY Plane report\n");
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prdate();
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sathead();
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} else if (flags & P_A) {
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pr("\nAnti-Sub Patrol report\n");
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} else {
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pr("\nReconnaissance report\n");
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prdate();
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}
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}
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for (;;) {
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getsect(x, y, §);
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memset(gotships, 0, sizeof(gotships));
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snxtitem_xy(&ni, EF_SHIP, x, y);
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while (nxtitem(&ni, &ship)) {
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if (mchr[(int)ship.shp_type].m_flags & M_SUB)
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continue;
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gotships[ship.shp_own] = 1;
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}
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memset(gotlands, 0, sizeof(gotlands));
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snxtitem_xy(&ni, EF_LAND, x, y);
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while (nxtitem(&ni, &land)) {
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if (land.lnd_ship >= 0 || land.lnd_land >= 0)
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continue;
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gotlands[land.lnd_own] = 1;
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}
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if (mission_flags & PM_R) {
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flags = pln_caps(bomb_list);
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if (opt_HIDDEN)
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setcont(player->cnum, sect.sct_own, FOUND_FLY);
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if (sect.sct_type == SCT_WATER) {
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pr("flying over %s at %s\n",
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dchr[sect.sct_type].d_name, xyas(x, y, player->cnum));
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if (mission_flags & PM_S)
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plane_sweep(bomb_list, x, y);
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if (flags & P_A)
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plane_sona(bomb_list, x, y, &head);
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changed += map_set(player->cnum,
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sect.sct_x, sect.sct_y,
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dchr[sect.sct_type].d_mnem, 0);
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} else if (flags & P_S) {
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satdisp_sect(§, flags & P_I ? 10 : 50);
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} else {
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look_at_sect(§, 25);
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changed += map_set(player->cnum,
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sect.sct_x, sect.sct_y,
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dchr[sect.sct_type].d_mnem, 0);
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}
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if (flags & P_S)
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satdisp_units(sect.sct_x, sect.sct_y);
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else {
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for (cn = 1; cn < MAXNOC; cn++) {
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if (cn == player->cnum)
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continue;
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if (gotships[cn])
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pr("Flying over %s ships in %s\n",
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cname(cn), xyas(x, y, player->cnum));
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if (gotlands[cn])
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pr("Flying over %s land units in %s\n",
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cname(cn), xyas(x, y, player->cnum));
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}
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}
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} else {
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PR(plane_owner, "flying over %s at %s\n",
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dchr[sect.sct_type].d_name, xyas(x, y, plane_owner));
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changed += map_set(plane_owner, sect.sct_x, sect.sct_y,
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dchr[sect.sct_type].d_mnem, 0);
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}
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evaded = do_evade(bomb_list, esc_list);
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if (!evaded) {
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overfly[sect.sct_own]++;
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for (cn = 1; cn < MAXNOC; cn++) {
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if (cn == plane_owner || rel[cn] == ALLIED)
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continue;
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if (cn != sect.sct_own && !gotships[cn] && !gotlands[cn])
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continue;
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PR(cn, "%s planes spotted over %s\n",
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cname(plane_owner), xyas(x, y, cn));
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if (opt_HIDDEN)
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setcont(cn, plane_owner, FOUND_FLY);
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}
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/* Fire flak */
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if (rel[sect.sct_own] <= HOSTILE)
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ac_doflak(bomb_list, §);
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/* If bombers left, fire flak from units and ships */
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if (!QEMPTY(bomb_list))
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ac_landflak(bomb_list, x, y);
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if (!QEMPTY(bomb_list))
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ac_shipflak(bomb_list, x, y);
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/* mission planes aborted due to flak -- don't send escorts */
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if (QEMPTY(bomb_list))
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break;
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for (cn = 1; cn < MAXNOC && !QEMPTY(bomb_list); cn++) {
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if (rel[cn] > HOSTILE)
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continue;
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ac_intercept(bomb_list, esc_list, &ilist[cn], cn, x, y,
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!(cn == sect.sct_own
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|| gotships[cn] || gotlands[cn]));
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}
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}
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dir = *path++;
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if (!dir || QEMPTY(bomb_list) || (val = diridx(dir)) == DIR_STOP)
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break;
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x = xnorm(x + diroff[val][0]);
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y = ynorm(y + diroff[val][1]);
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}
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/* Let's report all of the overflights even if aborted */
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for (cn = 1; cn < MAXNOC; cn++) {
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if (plane_owner == cn)
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continue;
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if (overfly[cn] > 0 && rel[cn] != ALLIED)
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nreport(plane_owner, N_OVFLY_SECT, cn, overfly[cn]);
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}
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/* If the map changed, update it */
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if (changed)
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writemap(player->cnum);
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free_shiplist(&head);
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for (cn = 1; cn < MAXNOC; cn++)
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pln_put(&ilist[cn]);
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}
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static void
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sam_intercept(struct emp_qelem *att_list, struct emp_qelem *def_list,
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natid def_own, natid plane_owner, coord x, coord y,
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int only_mission)
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{
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struct emp_qelem *aqp;
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struct emp_qelem *anext;
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struct emp_qelem *dqp;
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struct emp_qelem *dnext;
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struct plist *aplp;
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struct plist *dplp;
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struct plnstr *pp;
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int first = 1;
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for (aqp = att_list->q_forw,
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dqp = def_list->q_forw;
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aqp != att_list && dqp != def_list; aqp = anext) {
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anext = aqp->q_forw;
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aplp = (struct plist *)aqp;
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if (aplp->pcp->pl_cost < 1000)
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continue;
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for (; dqp != def_list; dqp = dnext) {
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dnext = dqp->q_forw;
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dplp = (struct plist *)dqp;
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pp = &dplp->plane;
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if (!(dplp->pcp->pl_flags & P_M))
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continue;
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if (only_mission && !pp->pln_mission)
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continue;
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if (pp->pln_range < mapdist(x, y, pp->pln_x, pp->pln_y))
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continue;
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if (pp->pln_mission
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&& pp->pln_radius < mapdist(x, y, pp->pln_opx, pp->pln_opy))
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continue;
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if (CANT_HAPPEN(pp->pln_flags & PLN_LAUNCHED)
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|| mission_pln_equip(dplp, NULL, 0) < 0) {
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emp_remque(dqp);
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free(dqp);
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continue;
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}
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pp->pln_flags |= PLN_LAUNCHED;
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putplane(pp->pln_uid, pp);
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if (first) {
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first = 0;
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PR(plane_owner, "%s launches SAMs!\n", cname(def_own));
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PR(def_own, "Launching SAMs at %s planes over %s!\n",
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cname(plane_owner), xyas(x, y, def_own));
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ac_combat_headers(plane_owner, def_own);
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}
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ac_dog(aplp, dplp);
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dqp = dnext;
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break;
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}
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}
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if (!first) {
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PR(plane_owner, "\n");
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PR(def_own, "\n");
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}
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}
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static void
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ac_intercept(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
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struct emp_qelem *def_list, natid def_own, coord x, coord y,
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int only_mission)
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{
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struct plnstr *pp;
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struct plist *plp;
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int icount;
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struct emp_qelem *next;
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struct emp_qelem *qp;
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struct emp_qelem int_list;
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int att_count;
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natid plane_owner;
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int dist;
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plp = (struct plist *)bomb_list->q_forw;
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plane_owner = plp->plane.pln_own;
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sam_intercept(bomb_list, def_list, def_own, plane_owner, x, y,
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only_mission);
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sam_intercept(esc_list, def_list, def_own, plane_owner, x, y,
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only_mission);
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att_count = 0;
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for (qp = bomb_list->q_forw; qp != bomb_list; qp = qp->q_forw)
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att_count++;
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for (qp = esc_list->q_forw; qp != esc_list; qp = qp->q_forw)
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att_count++;
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if (!att_count)
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return;
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emp_initque(&int_list);
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icount = 0;
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for (qp = def_list->q_forw; qp != def_list; qp = next) {
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next = qp->q_forw;
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plp = (struct plist *)qp;
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pp = &plp->plane;
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/* SAMs interdict separately */
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if (plp->pcp->pl_flags & P_M)
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continue;
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if (only_mission && !pp->pln_mission)
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continue;
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dist = mapdist(x, y, pp->pln_x, pp->pln_y) * 2;
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if (pp->pln_range < dist)
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continue;
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if (pp->pln_mission
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&& pp->pln_radius < mapdist(x, y, pp->pln_opx, pp->pln_opy))
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continue;
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if (CANT_HAPPEN(pp->pln_flags & PLN_LAUNCHED)
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|| mission_pln_equip(plp, NULL, 0) < 0) {
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emp_remque(qp);
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free(qp);
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continue;
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}
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/* got one; delete from def_list, add to int_list */
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emp_remque(qp);
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emp_insque(qp, &int_list);
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pp->pln_flags |= PLN_LAUNCHED;
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pp->pln_mobil -= pln_mobcost(dist, pp, 0);
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putplane(pp->pln_uid, pp);
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icount++;
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if (icount > att_count)
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break;
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}
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if (icount == 0)
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return;
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PR(plane_owner, "%d %s fighter%s rising to intercept!\n",
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icount, cname(def_own), icount == 1 ? " is" : "s are");
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PR(def_own, "%d fighter%s intercepting %s planes over %s!\n",
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icount, icount == 1 ? " is" : "s are", cname(plane_owner),
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xyas(x, y, def_own));
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ac_combat_headers(plane_owner, def_own);
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ac_airtoair(esc_list, &int_list);
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ac_airtoair(bomb_list, &int_list);
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PR(plane_owner, "\n");
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PR(def_own, "\n");
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pln_put(&int_list);
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}
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static void
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ac_combat_headers(natid plane_owner, natid def_own)
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{
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PR(plane_owner,
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" %-10.10s %-10.10s strength int odds damage results\n",
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cname(plane_owner), cname(def_own));
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PR(def_own,
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" %-10.10s %-10.10s strength int odds damage results\n",
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cname(def_own), cname(plane_owner));
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}
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/*
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* air-to-air combat.
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*/
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static void
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ac_airtoair(struct emp_qelem *att_list, struct emp_qelem *int_list)
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{
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struct plist *attacker;
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struct plist *interceptor;
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struct emp_qelem *att;
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struct emp_qelem *in;
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int more_att;
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int more_int;
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struct emp_qelem *att_next;
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struct emp_qelem *in_next;
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att = att_list->q_forw;
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in = int_list->q_forw;
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more_att = 1;
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more_int = 1;
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if (QEMPTY(att_list) || QEMPTY(int_list)) {
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more_att = 0;
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more_int = 0;
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}
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while (more_att || more_int) {
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in_next = in->q_forw;
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att_next = att->q_forw;
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attacker = (struct plist *)att;
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interceptor = (struct plist *)in;
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ac_dog(attacker, interceptor);
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in = in_next;
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att = att_next;
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if (att == att_list) {
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more_att = 0;
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if (QEMPTY(att_list))
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more_int = 0;
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else
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att = att->q_forw;
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}
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if (in == int_list) {
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more_int = 0;
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if (QEMPTY(int_list))
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more_att = 0;
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else
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in = in->q_forw;
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}
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}
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}
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static void
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ac_dog(struct plist *ap, struct plist *dp)
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{
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int att, def;
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double odds;
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int intensity;
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natid att_own, def_own;
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int adam, ddam;
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char mesg[1024];
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char temp[14];
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att_own = ap->plane.pln_own;
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def_own = dp->plane.pln_own;
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PR(att_own, " %3.3s #%-4d %3.3s #%-4d",
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ap->pcp->pl_name,
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ap->plane.pln_uid, dp->pcp->pl_name, dp->plane.pln_uid);
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if (def_own)
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PR(def_own, " %3.3s #%-4d %3.3s #%-4d",
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dp->pcp->pl_name,
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dp->plane.pln_uid, ap->pcp->pl_name, ap->plane.pln_uid);
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att = pln_att(&ap->plane);
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if (att == 0)
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att = pln_def(&ap->plane);
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att = att * ap->plane.pln_effic / 100;
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att = MAX(att, ap->pcp->pl_def / 2);
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def = pln_def(&dp->plane) * dp->plane.pln_effic / 100;
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def = MAX(def, dp->pcp->pl_def / 2);
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if ((ap->pcp->pl_flags & P_F) && ap->load != 0)
|
|
att -= 2;
|
|
if ((dp->pcp->pl_flags & P_F) && dp->load != 0)
|
|
def -= 2;
|
|
att += ap->pcp->pl_stealth / 25.0;
|
|
def += dp->pcp->pl_stealth / 25.0;
|
|
if (att < 1) {
|
|
def += 1 - att;
|
|
att = 1;
|
|
}
|
|
if (def < 1) {
|
|
att += 1 - def;
|
|
def = 1;
|
|
}
|
|
odds = ((double)att / ((double)def + (double)att));
|
|
if (odds <= 0.05)
|
|
odds = 0.05;
|
|
intensity = roll(20) + roll(20) + roll(20) + roll(20) + 1;
|
|
|
|
PR(att_own, " %3d/%-3d %3d %3.2f ", att, def, intensity, odds);
|
|
PR(def_own, " %3d/%-3d %3d %3.2f ", def, att, intensity, odds);
|
|
|
|
adam = 0;
|
|
ddam = 0;
|
|
while ((intensity--) > 0) {
|
|
|
|
if (chance(odds)) {
|
|
ddam += 1;
|
|
if ((dp->plane.pln_effic - ddam) < PLANE_MINEFF)
|
|
intensity = 0;
|
|
} else {
|
|
adam += 1;
|
|
if ((ap->plane.pln_effic - adam) < PLANE_MINEFF)
|
|
intensity = 0;
|
|
}
|
|
}
|
|
|
|
if (dp->pcp->pl_flags & P_M)
|
|
ddam = 100;
|
|
|
|
PR(att_own, "%3d/%-3d", adam, ddam);
|
|
PR(def_own, "%3d/%-3d", ddam, adam);
|
|
ac_planedamage(ap, def_own, adam, def_own, 1, 0, mesg);
|
|
strncpy(temp, mesg, 14);
|
|
ac_planedamage(dp, att_own, ddam, att_own, 1, 0, mesg);
|
|
PR(att_own, "%-13.13s %-13.13s\n", temp, mesg);
|
|
PR(def_own, "%-13.13s %-13.13s\n", mesg, temp);
|
|
|
|
if (opt_HIDDEN) {
|
|
setcont(att_own, def_own, FOUND_FLY);
|
|
setcont(def_own, att_own, FOUND_FLY);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* zap plane associated with plp.
|
|
* Damaging country is "from", damage is "dam".
|
|
* def_own is the country on the other side of the conflict from the plane
|
|
* owner. The only time def_own != from is when the interceptor is getting
|
|
* damaged.
|
|
*
|
|
* NOTE: This routine removes the appropriate plane element from the
|
|
* queue if it gets destroyed. That means that the caller must assume
|
|
* that the current queue pointer is invalid on return from the ac_planedamage
|
|
* call. (this has caused bugs in the past)
|
|
*/
|
|
static void
|
|
ac_planedamage(struct plist *plp, natid from, int dam, natid other,
|
|
int checkabort, int show, char *mesg)
|
|
{
|
|
struct plnstr *pp;
|
|
int disp;
|
|
char dmess[255];
|
|
int eff;
|
|
natid plane_owner;
|
|
|
|
disp = 0;
|
|
pp = &plp->plane;
|
|
plane_owner = pp->pln_own;
|
|
eff = pp->pln_effic;
|
|
sprintf(dmess, " no damage");
|
|
if (dam <= 0) {
|
|
strcpy(mesg, dmess);
|
|
return;
|
|
}
|
|
memset(dmess, 0, sizeof(dmess));
|
|
eff -= dam;
|
|
if (eff < 0)
|
|
eff = 0;
|
|
if (eff < PLANE_MINEFF) {
|
|
sprintf(dmess, " shot down");
|
|
disp = 1;
|
|
} else if (eff < 80 && chance((80 - eff) / 100.0) && checkabort) {
|
|
sprintf(dmess, " aborted @%2d%%", eff);
|
|
disp = 2;
|
|
} else if (show == 0) {
|
|
sprintf(dmess, " cleared");
|
|
}
|
|
|
|
if ((plp->pcp->pl_flags & P_M) == 0) {
|
|
if (show) {
|
|
PR(plane_owner, " %s %s takes %d%s.\n",
|
|
cname(pp->pln_own), prplane(pp), dam, dmess);
|
|
if (other)
|
|
PR(other, " %s %s takes %d%s.\n",
|
|
cname(pp->pln_own), prplane(pp), dam, dmess);
|
|
}
|
|
}
|
|
if (show && checkabort == 1) {
|
|
PR(plane_owner, "\n");
|
|
if (other)
|
|
PR(other, "\n");
|
|
}
|
|
|
|
pp->pln_effic = eff;
|
|
pp->pln_mobil -= MIN(32 + pp->pln_mobil, dam / 2);
|
|
if (disp) {
|
|
if (disp == 1 && from != 0 && (plp->pcp->pl_flags & P_M) == 0)
|
|
nreport(from, N_DOWN_PLANE, pp->pln_own, 1);
|
|
pln_put1(plp);
|
|
} else
|
|
putplane(pp->pln_uid, pp);
|
|
strcpy(mesg, dmess);
|
|
}
|
|
|
|
static void
|
|
ac_doflak(struct emp_qelem *list, struct sctstr *from)
|
|
{
|
|
int gun;
|
|
natid plane_owner;
|
|
struct plist *plp;
|
|
|
|
plp = (struct plist *)list->q_forw;
|
|
plane_owner = plp->plane.pln_own;
|
|
|
|
gun = MIN(FLAK_GUN_MAX, from->sct_item[I_GUN]);
|
|
gun = roundavg(tfact(from->sct_own, 2.0 * gun));
|
|
if (gun > 0) {
|
|
PR(plane_owner, "firing %d flak guns in %s...\n",
|
|
gun, xyas(from->sct_x, from->sct_y, plane_owner));
|
|
if (from->sct_own != 0)
|
|
PR(from->sct_own, "firing %d flak guns in %s...\n",
|
|
gun, xyas(from->sct_x, from->sct_y, from->sct_own));
|
|
ac_fireflak(list, from->sct_own, gun);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ac_shipflak(struct emp_qelem *list, coord x, coord y)
|
|
{
|
|
struct nstr_item ni;
|
|
struct shpstr ship;
|
|
struct mchrstr *mcp;
|
|
double flak, total, ngun;
|
|
int gun;
|
|
int rel;
|
|
struct plist *plp;
|
|
natid plane_owner;
|
|
natid from;
|
|
|
|
plp = (struct plist *)list->q_forw;
|
|
plane_owner = plp->plane.pln_own;
|
|
|
|
total = ngun = 0;
|
|
snxtitem_xy(&ni, EF_SHIP, x, y);
|
|
while (!QEMPTY(list) && nxtitem(&ni, &ship)) {
|
|
if (ship.shp_own == 0 || ship.shp_own == plane_owner)
|
|
continue;
|
|
mcp = &mchr[(int)ship.shp_type];
|
|
if (mcp->m_flags & M_SUB)
|
|
continue;
|
|
rel = getrel(getnatp(ship.shp_own), plane_owner);
|
|
if (rel > HOSTILE)
|
|
continue;
|
|
gun = shp_usable_guns(&ship);
|
|
if (gun == 0)
|
|
continue;
|
|
flak = gun * (ship.shp_effic / 100.0);
|
|
ngun += flak;
|
|
total += techfact(ship.shp_tech, flak * 2.0);
|
|
|
|
PR(ship.shp_own, "firing %.0f flak guns from %s...\n",
|
|
flak, prship(&ship));
|
|
from = ship.shp_own;
|
|
}
|
|
|
|
/* Limit to FLAK_GUN_MAX guns of average tech factor */
|
|
if (ngun > FLAK_GUN_MAX)
|
|
total *= FLAK_GUN_MAX / ngun;
|
|
|
|
gun = roundavg(total);
|
|
if (gun > 0) {
|
|
PR(plane_owner, "Flak! Ships firing %d flak guns...\n", gun);
|
|
ac_fireflak(list, from, gun);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ac_landflak(struct emp_qelem *list, coord x, coord y)
|
|
{
|
|
struct nstr_item ni;
|
|
struct lndstr land;
|
|
struct lchrstr *lcp;
|
|
double flak, total, ngun;
|
|
int aaf, gun;
|
|
int rel;
|
|
struct plist *plp;
|
|
natid plane_owner;
|
|
natid from;
|
|
|
|
plp = (struct plist *)list->q_forw;
|
|
plane_owner = plp->plane.pln_own;
|
|
|
|
total = ngun = 0;
|
|
snxtitem_xy(&ni, EF_LAND, x, y);
|
|
while (!QEMPTY(list) && nxtitem(&ni, &land)) {
|
|
if (land.lnd_own == 0 || land.lnd_own == plane_owner)
|
|
continue;
|
|
lcp = &lchr[(int)land.lnd_type];
|
|
aaf = lnd_aaf(&land);
|
|
if ((lcp->l_flags & L_FLAK) == 0 || aaf == 0)
|
|
continue;
|
|
if (land.lnd_ship >= 0 || land.lnd_land >= 0)
|
|
continue;
|
|
rel = getrel(getnatp(land.lnd_own), plane_owner);
|
|
if (rel > HOSTILE)
|
|
continue;
|
|
flak = aaf * 1.5 * land.lnd_effic / 100.0;
|
|
ngun += flak;
|
|
total += techfact(land.lnd_tech, flak * 2.0);
|
|
|
|
PR(land.lnd_own, "firing flak guns from unit %s (aa rating %d)\n",
|
|
prland(&land), aaf);
|
|
from = land.lnd_own;
|
|
}
|
|
|
|
/* Limit to FLAK_GUN_MAX guns of average tech factor */
|
|
if (ngun > FLAK_GUN_MAX)
|
|
total *= FLAK_GUN_MAX / ngun;
|
|
|
|
gun = roundavg(total);
|
|
if (gun > 0) {
|
|
PR(plane_owner, "Flak! Land units firing %d flak guns...\n", gun);
|
|
ac_fireflak(list, from, gun);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called from shipflak, landflak, and doflak.
|
|
*/
|
|
static void
|
|
ac_fireflak(struct emp_qelem *list, natid from, int guns)
|
|
{
|
|
struct plist *plp;
|
|
int n;
|
|
struct emp_qelem *qp;
|
|
struct emp_qelem *next;
|
|
char msg[255];
|
|
|
|
for (qp = list->q_forw; qp != list; qp = next) {
|
|
next = qp->q_forw;
|
|
plp = (struct plist *)qp;
|
|
n = ac_flak_dam(guns, pln_def(&plp->plane), plp->pcp->pl_flags);
|
|
ac_planedamage(plp, from, n, 0, 2, 1, msg);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Calculate flak damage
|
|
*/
|
|
int
|
|
ac_flak_dam(int guns, int def, int pl_flags)
|
|
{
|
|
int flak, dam;
|
|
float mult;
|
|
/* <-7 -7 -6 -5 -4 */
|
|
static float flaktable[18] = { 0.132f, 0.20f, 0.20f, 0.25f, 0.30f,
|
|
/* -3 -2 -1 0 +1 +2 +3 +4 */
|
|
0.35f, 0.40f, 0.45f, 0.50f, 0.50f, 0.55f, 0.60f, 0.65f,
|
|
/* +5 +6 +7 +8 >+8 */
|
|
0.70f,0.75f, 0.80f, 0.85f, 1.1305f };
|
|
enum { FLAK_MAX = sizeof(flaktable)/sizeof(flaktable[0]) - 1 };
|
|
|
|
flak = guns - def;
|
|
if ((pl_flags & P_T) == 0)
|
|
flak--;
|
|
|
|
if (flak > 8)
|
|
mult = flaktable[FLAK_MAX];
|
|
else if (flak < -7)
|
|
mult = flaktable[0];
|
|
else {
|
|
flak += 8;
|
|
mult = flaktable[flak];
|
|
}
|
|
mult *= flakscale;
|
|
dam = (int)((roll(8) + 2) * mult);
|
|
if (dam > 100)
|
|
dam = 100;
|
|
return dam;
|
|
}
|
|
|
|
/*
|
|
* Get planes available for interception duties.
|
|
*/
|
|
static void
|
|
getilists(struct emp_qelem *list, unsigned char *rel, natid intruder)
|
|
{
|
|
natid cn;
|
|
struct plchrstr *pcp;
|
|
struct plnstr plane;
|
|
struct nstr_item ni;
|
|
struct plist *ip;
|
|
|
|
rel[0] = NEUTRAL;
|
|
for (cn = 1; cn < MAXNOC; cn++) {
|
|
rel[cn] = getrel(getnatp(cn), intruder);
|
|
emp_initque(&list[cn]);
|
|
}
|
|
|
|
snxtitem_all(&ni, EF_PLANE);
|
|
while (nxtitem(&ni, &plane)) {
|
|
if (rel[plane.pln_own] > HOSTILE)
|
|
continue;
|
|
pcp = &plchr[(int)plane.pln_type];
|
|
if ((pcp->pl_flags & P_F) == 0)
|
|
continue;
|
|
if (plane.pln_flags & PLN_LAUNCHED)
|
|
continue;
|
|
if (plane.pln_mission && plane.pln_mission != MI_AIR_DEFENSE)
|
|
continue;
|
|
if (plane.pln_mobil <= 0)
|
|
continue;
|
|
if (plane.pln_effic < 40)
|
|
continue;
|
|
if (!pln_airbase_ok(&plane, 0, 0))
|
|
continue;
|
|
/* got one! */
|
|
ip = malloc(sizeof(*ip));
|
|
ip->load = 0;
|
|
ip->pcp = &plchr[(int)plane.pln_type];
|
|
ip->plane = plane;
|
|
emp_insque(&ip->queue, &list[plane.pln_own]);
|
|
}
|
|
}
|
|
|
|
static int
|
|
do_evade(struct emp_qelem *bomb_list, struct emp_qelem *esc_list)
|
|
{
|
|
struct emp_qelem *qp;
|
|
double evade;
|
|
struct plist *plp;
|
|
|
|
evade = 100.0;
|
|
for (qp = bomb_list->q_forw; qp != bomb_list; qp = qp->q_forw) {
|
|
plp = (struct plist *)qp;
|
|
if (evade > plp->pcp->pl_stealth / 100.0)
|
|
evade = plp->pcp->pl_stealth / 100.0;
|
|
}
|
|
for (qp = esc_list->q_forw; qp != esc_list; qp = qp->q_forw) {
|
|
plp = (struct plist *)qp;
|
|
if (evade > plp->pcp->pl_stealth / 100.0)
|
|
evade = plp->pcp->pl_stealth / 100.0;
|
|
}
|
|
|
|
if (chance(evade))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|