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empserver/src/lib/subs/aircombat.c
Markus Armbruster ee1e0ab0e1 Fix making contact by spotting planes from sectors 
ac_encounter() passed MAXNOC instead of the sector owner to setcont(),
and setcont() does nothing for such an argument.  Screwed up from the
start, in commit 144c7cb5, v4.2.22.
2009-02-01 17:14:38 +01:00

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/*
* Empire - A multi-player, client/server Internet based war game.
* Copyright (C) 1986-2008, Dave Pare, Jeff Bailey, Thomas Ruschak,
* Ken Stevens, Steve McClure
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---
*
* See files README, COPYING and CREDITS in the root of the source
* tree for related information and legal notices. It is expected
* that future projects/authors will amend these files as needed.
*
* ---
*
* aircombat.c: Deal with air to air combat
*
* Known contributors to this file:
* Dave Pare, 1986
* Thomas Ruschak, 1992
* Steve McClure, 1996
* Markus Armbruster, 2006-2008
*/
#include <config.h>
#include "file.h"
#include "land.h"
#include "map.h"
#include "misc.h"
#include "nat.h"
#include "news.h"
#include "nsc.h"
#include "optlist.h"
#include "path.h"
#include "plane.h"
#include "player.h"
#include "prototypes.h"
#include "sect.h"
#include "ship.h"
#include "xy.h"
#define FLAK_GUN_MAX 14
static int plane_caps(struct emp_qelem *);
static void ac_intercept(struct emp_qelem *, struct emp_qelem *,
struct emp_qelem *, natid, coord, coord);
static int all_missiles(struct emp_qelem *);
static void ac_dog(struct plist *, struct plist *);
static void ac_planedamage(struct plist *, natid, int, natid, int,
int, char *);
static void ac_doflak(struct emp_qelem *, struct sctstr *);
static void ac_landflak(struct emp_qelem *, coord, coord);
static void ac_shipflak(struct emp_qelem *, coord, coord);
static void ac_fireflak(struct emp_qelem *, natid, int);
static void getilist(struct emp_qelem *, natid);
static int do_evade(struct emp_qelem *, struct emp_qelem *);
void
ac_encounter(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
coord x, coord y, char *path, int mission_flags,
int no_air_defense)
{
int val, non_missiles;
int rel;
int dir;
int nats[MAXNOC];
int lnats[MAXNOC];
int gotilist[MAXNOC];
int unfriendly[MAXNOC];
int overfly[MAXNOC];
int flags;
struct emp_qelem ilist[MAXNOC], *qp;
char mypath[1024];
int myp;
int civ, mil;
natid plane_owner;
struct sctstr sect;
struct shpstr ship;
struct lndstr land;
struct nstr_item ni;
natid cn;
struct natstr *over, *mynatp;
struct plist *plp;
int evaded;
struct shiplist *head = NULL;
int changed = 0;
/* We want to only intercept once per sector per owner. So, if we overfly
a sector, and then overfly some land units or ships, we don't want to
potentially intercept 3 times. */
plp = (struct plist *)bomb_list->q_forw;
plane_owner = plp->plane.pln_own;
strncpy(mypath, path, sizeof(mypath));
myp = 0;
memset(overfly, 0, sizeof(overfly));
memset(gotilist, 0, sizeof(gotilist));
memset(unfriendly, 0, sizeof(unfriendly));
for (cn = 1; cn < MAXNOC; cn++) {
if ((mynatp = getnatp(cn)) == 0)
continue;
rel = getrel(mynatp, plane_owner);
if (rel > HOSTILE)
continue;
if (plane_owner == cn)
continue;
unfriendly[cn]++;
}
if (mission_flags & PM_R) {
flags = plane_caps(bomb_list);
if (flags & P_S) {
PR(plane_owner, "\nSPY Plane report\n");
PRdate(plane_owner);
sathead();
} else if (flags & P_A) {
PR(plane_owner, "\nAnti-Sub Patrol report\n");
} else {
PR(plane_owner, "\nReconnaissance report\n");
PRdate(plane_owner);
}
}
while ((dir = mypath[myp++]) && !QEMPTY(bomb_list)) {
if ((val = diridx(dir)) == DIR_STOP)
break;
/* XXX using xnorm is probably bad */
x = xnorm(x + diroff[val][0]);
y = ynorm(y + diroff[val][1]);
getsect(x, y, &sect);
over = getnatp(sect.sct_own);
if (mission_flags & PM_R) {
flags = plane_caps(bomb_list);
if (opt_HIDDEN)
setcont(plane_owner, sect.sct_own, FOUND_FLY);
if (sect.sct_type == SCT_WATER) {
PR(plane_owner, "flying over %s at %s\n",
dchr[sect.sct_type].d_name, xyas(x, y, plane_owner));
if (mission_flags & PM_S)
plane_sweep(bomb_list, x, y);
if (flags & P_A)
plane_sona(bomb_list, x, y, &head);
changed += map_set(plane_owner,
sect.sct_x, sect.sct_y,
dchr[sect.sct_type].d_mnem, 0);
} else if (flags & P_S) {
satdisp_sect(&sect, flags & P_I ? 10 : 50);
} else {
/* This is borrowed from lookout */
if (sect.sct_own == plane_owner)
PR(plane_owner, "Your ");
else
PR(plane_owner, "%s (#%d) ",
cname(sect.sct_own), sect.sct_own);
PR(plane_owner, "%s", dchr[sect.sct_type].d_name);
changed += map_set(plane_owner,
sect.sct_x, sect.sct_y,
dchr[sect.sct_type].d_mnem, 0);
PR(plane_owner, " %d%% efficient ",
(sect.sct_own == plane_owner) ?
sect.sct_effic : roundintby((int)sect.sct_effic, 25));
civ = sect.sct_item[I_CIVIL];
mil = sect.sct_item[I_MILIT];
if (civ)
PR(plane_owner, "with %s%d civ ",
(sect.sct_own == plane_owner) ?
"" : "approx ",
(sect.sct_own == plane_owner) ?
civ : roundintby(civ, 25));
if (mil)
PR(plane_owner, "with %s%d mil ",
(sect.sct_own == plane_owner) ?
"" : "approx ",
(sect.sct_own == plane_owner) ?
mil : roundintby(mil, 25));
PR(plane_owner, "@ %s\n", xyas(x, y, plane_owner));
}
if (flags & P_S)
satdisp_units(sect.sct_x, sect.sct_y);
} else {
PR(plane_owner, "flying over %s at %s\n",
dchr[sect.sct_type].d_name, xyas(x, y, plane_owner));
changed += map_set(plane_owner, sect.sct_x, sect.sct_y,
dchr[sect.sct_type].d_mnem, 0);
}
if ((rel = getrel(over, plane_owner)) == ALLIED)
continue;
evaded = do_evade(bomb_list, esc_list);
if (sect.sct_own != 0 && sect.sct_own != plane_owner && !evaded) {
/* We only show planes overhead if they didn't
* evade radar */
overfly[sect.sct_own]++;
PR(sect.sct_own, "%s planes spotted over %s\n",
cname(plane_owner), xyas(x, y, sect.sct_own));
if (opt_HIDDEN)
setcont(sect.sct_own, plane_owner, FOUND_FLY);
}
if (!evaded) {
/* Fire flak */
if (unfriendly[sect.sct_own])
ac_doflak(bomb_list, &sect);
/* If bombers left, fire flak from units and ships */
if (!QEMPTY(bomb_list))
ac_landflak(bomb_list, x, y);
if (!QEMPTY(bomb_list))
ac_shipflak(bomb_list, x, y);
}
/* mission planes aborted due to flak -- don't send escorts */
if (QEMPTY(bomb_list))
break;
if (!no_air_defense && !evaded)
air_defense(x, y, plane_owner, bomb_list, esc_list);
if (sect.sct_own == 0 || sect.sct_own == plane_owner)
continue;
if (evaded)
continue;
non_missiles = 0;
for (qp = bomb_list->q_forw; qp != bomb_list; qp = qp->q_forw) {
struct plist *ip = (struct plist *)qp;
if (!(plchr[(int)ip->plane.pln_type].pl_flags & P_M))
non_missiles = 1;
}
if (!non_missiles)
continue;
if (unfriendly[sect.sct_own] && !gotilist[sect.sct_own]) {
getilist(&ilist[sect.sct_own], sect.sct_own);
gotilist[sect.sct_own]++;
}
if (rel > HOSTILE)
continue;
ac_intercept(bomb_list, esc_list, &ilist[sect.sct_own],
sect.sct_own, x, y);
}
/* Let's report all of the overflights even if aborted */
for (cn = 1; cn < MAXNOC; cn++) {
if (plane_owner == cn)
continue;
if (overfly[cn] > 0)
nreport(plane_owner, N_OVFLY_SECT, cn, overfly[cn]);
}
/* If the map changed, update it */
if (changed)
writemap(player->cnum);
/* Now, if the bomber and escort lists are empty, we are done */
if (QEMPTY(bomb_list) && QEMPTY(esc_list))
goto out;
/* Something made it through */
/* Go figure out if there are ships in this sector, and who's they are */
memset(nats, 0, sizeof(nats));
snxtitem_xy(&ni, EF_SHIP, x, y);
while (nxtitem(&ni, &ship)) {
if (mchr[(int)ship.shp_type].m_flags & M_SUB)
continue;
nats[ship.shp_own]++;
}
/* Go figure out if there are units in this sector, and who's they are */
memset(lnats, 0, sizeof(lnats));
snxtitem_xy(&ni, EF_LAND, x, y);
while (nxtitem(&ni, &land)) {
if (land.lnd_ship >= 0 || land.lnd_land >= 0)
continue;
lnats[land.lnd_own]++;
}
/* Now, let's make life a little rougher. */
for (cn = 1; cn < MAXNOC && !QEMPTY(bomb_list); cn++) {
if (plane_owner == cn)
continue;
if (nats[cn] != 0) {
PR(plane_owner, "Flying over %s ships in %s\n",
cname(cn), xyas(x, y, plane_owner));
PR(cn, "%s planes spotted over ships in %s\n",
cname(plane_owner), xyas(x, y, cn));
}
if (lnats[cn] != 0) {
PR(plane_owner, "Flying over %s land units in %s\n",
cname(cn), xyas(x, y, plane_owner));
PR(cn, "%s planes spotted over land units in %s\n",
cname(plane_owner), xyas(x, y, cn));
}
if (nats[cn] || lnats[cn]) {
if (opt_HIDDEN)
setcont(cn, plane_owner, FOUND_FLY);
if (unfriendly[cn] && !evaded) {
if (!gotilist[cn]) {
getilist(&ilist[cn], cn);
gotilist[cn]++;
}
ac_intercept(bomb_list, esc_list, &ilist[cn], cn, x, y);
}
}
}
out:
free_shiplist(&head);
for (cn = 1; cn < MAXNOC; cn++) {
if (gotilist[cn])
pln_put(&ilist[cn]);
}
}
static int
plane_caps(struct emp_qelem *list)
{
struct emp_qelem *qp;
struct plist *plp;
int fl;
fl = 0;
for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
plp = (struct plist *)qp;
fl |= plp->pcp->pl_flags;
}
return fl;
}
static int
count_non_missiles(struct emp_qelem *list)
{
struct emp_qelem *qp;
struct plist *plp;
int att_count = 0;
/* don't intercept missiles */
for (qp = list->q_forw; qp != list; qp = qp->q_forw) {
plp = (struct plist *)qp;
if (!(plp->pcp->pl_flags & P_M))
att_count++;
}
return att_count;
}
void
sam_intercept(struct emp_qelem *att_list, struct emp_qelem *def_list,
natid def_own, natid plane_owner, coord x, coord y,
int delete_missiles)
{
struct emp_qelem *aqp;
struct emp_qelem *anext;
struct emp_qelem *dqp;
struct emp_qelem *dnext;
struct plist *aplp;
struct plist *dplp;
int first = 1;
for (aqp = att_list->q_forw,
dqp = def_list->q_forw;
aqp != att_list && dqp != def_list; aqp = anext) {
anext = aqp->q_forw;
aplp = (struct plist *)aqp;
if (aplp->pcp->pl_flags & P_M)
continue;
if (aplp->pcp->pl_cost < 1000)
continue;
for (; dqp != def_list; dqp = dnext) {
dnext = dqp->q_forw;
dplp = (struct plist *)dqp;
if (!(dplp->pcp->pl_flags & P_M))
continue;
if (dplp->plane.pln_range <
mapdist(x, y, dplp->plane.pln_x, dplp->plane.pln_y)) {
emp_remque(dqp);
free(dqp);
continue;
}
if (CANT_HAPPEN(dplp->plane.pln_flags & PLN_LAUNCHED)
|| mission_pln_equip(dplp, 0, P_F, 0) < 0) {
emp_remque(dqp);
free(dqp);
continue;
}
dplp->plane.pln_flags |= PLN_LAUNCHED;
putplane(dplp->plane.pln_uid, &dplp->plane);
if (first) {
first = 0;
PR(plane_owner, "%s launches SAMs!\n", cname(def_own));
PR(def_own, "Launching SAMs at %s planes over %s!\n",
cname(plane_owner), xyas(x, y, def_own));
ac_combat_headers(plane_owner, def_own);
}
ac_dog(aplp, dplp);
dqp = dnext;
break;
}
}
if (!first) {
PR(plane_owner, "\n");
PR(def_own, "\n");
}
if (delete_missiles) {
for (; dqp != def_list; dqp = dnext) {
dnext = dqp->q_forw;
dplp = (struct plist *)dqp;
if (!(dplp->pcp->pl_flags & P_M))
continue;
emp_remque(dqp);
free(dqp);
continue;
}
}
}
static void
ac_intercept(struct emp_qelem *bomb_list, struct emp_qelem *esc_list,
struct emp_qelem *def_list, natid def_own, coord x, coord y)
{
struct plnstr *pp;
struct plist *plp;
int icount;
struct emp_qelem *next;
struct emp_qelem *qp;
struct emp_qelem int_list;
int att_count;
natid plane_owner;
int dist;
plp = (struct plist *)bomb_list->q_forw;
plane_owner = plp->plane.pln_own;
icount = 0;
sam_intercept(bomb_list, def_list, def_own, plane_owner, x, y, 0);
sam_intercept(esc_list, def_list, def_own, plane_owner, x, y, 1);
if (!(att_count = count_non_missiles(bomb_list) +
count_non_missiles(esc_list)))
return;
emp_initque(&int_list);
for (qp = def_list->q_forw; qp != def_list; qp = next) {
next = qp->q_forw;
plp = (struct plist *)qp;
pp = &plp->plane;
/* SAMs interdict separately */
if (plp->pcp->pl_flags & P_M)
continue;
dist = mapdist(x, y, pp->pln_x, pp->pln_y) * 2;
if (pp->pln_range < dist)
continue;
if (CANT_HAPPEN(pp->pln_flags & PLN_LAUNCHED)
|| mission_pln_equip(plp, 0, P_F, 0) < 0) {
emp_remque(qp);
free(qp);
continue;
}
/* got one; delete from def_list, add to int_list */
emp_remque(qp);
emp_insque(qp, &int_list);
pp->pln_flags |= PLN_LAUNCHED;
pp->pln_mobil -= pln_mobcost(dist, pp, P_F);
putplane(pp->pln_uid, pp);
icount++;
if (icount > att_count)
break;
}
if (icount == 0)
return;
PR(plane_owner, "%d %s fighter%s rising to intercept!\n",
icount, cname(def_own), icount == 1 ? " is" : "s are");
PR(def_own, "%d fighter%s intercepting %s planes over %s!\n",
icount, icount == 1 ? " is" : "s are", cname(plane_owner),
xyas(x, y, def_own));
ac_combat_headers(plane_owner, def_own);
ac_airtoair(esc_list, &int_list);
ac_airtoair(bomb_list, &int_list);
PR(plane_owner, "\n");
PR(def_own, "\n");
pln_put(&int_list);
}
void
ac_combat_headers(natid plane_owner, natid def_own)
{
PR(plane_owner,
" %-10.10s %-10.10s strength int odds damage results\n",
cname(plane_owner), cname(def_own));
PR(def_own,
" %-10.10s %-10.10s strength int odds damage results\n",
cname(def_own), cname(plane_owner));
}
/*
* air-to-air combat.
*/
void
ac_airtoair(struct emp_qelem *att_list, struct emp_qelem *int_list)
{
struct plist *attacker;
struct plist *interceptor;
struct emp_qelem *att;
struct emp_qelem *in;
int nplanes;
int more_att;
int more_int;
struct emp_qelem *att_next;
struct emp_qelem *in_next;
att = att_list->q_forw;
in = int_list->q_forw;
more_att = 1;
more_int = 1;
if (QEMPTY(att_list) || QEMPTY(int_list)) {
more_att = 0;
more_int = 0;
}
while (more_att || more_int) {
in_next = in->q_forw;
att_next = att->q_forw;
attacker = (struct plist *)att;
/* skip missiles. If only missiles left, we're done */
if (plchr[(int)attacker->plane.pln_type].pl_flags & P_M) {
att = att_next;
if (att == att_list) {
more_att = 0;
if (QEMPTY(att_list))
more_int = 0;
else
att = att->q_forw;
}
if (all_missiles(att_list))
more_att = 0;
continue;
}
interceptor = (struct plist *)in;
nplanes = attacker->plane.pln_effic;
if (nplanes > interceptor->plane.pln_effic)
nplanes = interceptor->plane.pln_effic;
ac_dog(attacker, interceptor);
in = in_next;
att = att_next;
if (att == att_list) {
more_att = 0;
if (QEMPTY(att_list))
more_int = 0;
else
att = att->q_forw;
}
if (in == int_list) {
more_int = 0;
if (QEMPTY(int_list))
more_att = 0;
else
in = in->q_forw;
}
}
}
static int
all_missiles(struct emp_qelem *att_list)
{
struct emp_qelem *qp;
struct plist *p;
qp = att_list->q_forw;
while (qp != att_list) {
p = (struct plist *)qp;
if (!(plchr[(int)p->plane.pln_type].pl_flags & P_M))
return 0;
qp = qp->q_forw;
}
return 1;
}
static void
ac_dog(struct plist *ap, struct plist *dp)
{
int att, def;
double odds;
int intensity;
natid att_own, def_own;
int adam, ddam;
char mesg[1024];
char temp[14];
att_own = ap->plane.pln_own;
def_own = dp->plane.pln_own;
PR(att_own, " %3.3s #%-4d %3.3s #%-4d",
ap->pcp->pl_name,
ap->plane.pln_uid, dp->pcp->pl_name, dp->plane.pln_uid);
if (def_own)
PR(def_own, " %3.3s #%-4d %3.3s #%-4d",
dp->pcp->pl_name,
dp->plane.pln_uid, ap->pcp->pl_name, ap->plane.pln_uid);
att = pln_att(&ap->plane);
if (att == 0)
att = pln_def(&ap->plane);
att = att * ap->plane.pln_effic / 100;
att = MAX(att, ap->pcp->pl_def / 2);
def = pln_def(&dp->plane) * dp->plane.pln_effic / 100;
def = MAX(def, dp->pcp->pl_def / 2);
if ((ap->pcp->pl_flags & P_F) && ap->bombs != 0)
att -= 2;
if ((dp->pcp->pl_flags & P_F) && dp->bombs != 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 shell;
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]);
shell = from->sct_item[I_SHELL];
if (gun > shell * 2) {
shell += supply_commod(from->sct_own, from->sct_x, from->sct_y,
I_SHELL, (gun + 1) / 2 - shell);
from->sct_item[I_SHELL] = shell;
putsect(from);
}
if (gun > shell * 2)
gun = shell * 2;
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, shell;
int rel;
struct plist *plp;
natid plane_owner;
natid from;
int nats[MAXNOC];
plp = (struct plist *)list->q_forw;
plane_owner = plp->plane.pln_own;
memset(nats, 0, sizeof(nats));
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;
shell = 0;
gun = shp_usable_guns(&ship);
if (gun) {
shell = ship.shp_item[I_SHELL];
if (shell <= 0) {
shell = supply_commod(ship.shp_own, ship.shp_x, ship.shp_y,
I_SHELL, 1);
ship.shp_item[I_SHELL] = shell;
putship(ship.shp_uid, &ship);
}
}
if (gun == 0 || shell == 0)
continue;
flak = gun * (ship.shp_effic / 100.0);
ngun += flak;
total += techfact(ship.shp_tech, flak * 2.0);
if (!nats[ship.shp_own]) {
/* First time here, print the message */
PR(ship.shp_own, "%s planes spotted over ships in %s\n",
cname(plane_owner), xyas(x, y, ship.shp_own));
PR(plane_owner, "Flying over %s ships in %s\n",
cname(ship.shp_own), xyas(x, y, plane_owner));
nats[ship.shp_own] = 1;
}
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;
int nats[MAXNOC];
plp = (struct plist *)list->q_forw;
plane_owner = plp->plane.pln_own;
memset(nats, 0, sizeof(nats));
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);
if (!nats[land.lnd_own]) {
/* First time here, print the message */
PR(land.lnd_own, "%s planes spotted over land units in %s\n",
cname(plane_owner), xyas(x, y, land.lnd_own));
PR(plane_owner, "Flying over %s land units in %s\n",
cname(land.lnd_own), xyas(x, y, plane_owner));
nats[land.lnd_own] = 1;
}
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];
plp = (struct plist *)list->q_forw;
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 (pl_flags & P_X)
flak -= 2;
if (pl_flags & P_H)
flak -= 1;
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 a list of planes available for interception duties.
*/
static void
getilist(struct emp_qelem *list, natid own)
{
struct plchrstr *pcp;
struct plnstr plane;
struct nstr_item ni;
struct plist *ip;
emp_initque(list);
snxtitem_all(&ni, EF_PLANE);
while (nxtitem(&ni, &plane)) {
if (plane.pln_own != own)
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 != 0)
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->bombs = 0;
ip->misc = 0;
ip->pcp = &plchr[(int)plane.pln_type];
ip->plane = plane;
emp_insque(&ip->queue, list);
}
}
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;
}
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