Import of Empire 4.2.12
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src/lib/subs/getbit.c
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175
src/lib/subs/getbit.c
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/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2000, 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 the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
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* related information and legal notices. It is expected that any future
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* projects/authors will amend these files as needed.
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*
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* ---
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*
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* getbit.c: Replaces old bitmap code
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*
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* Known contributors to this file:
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* Dave Pare, 1989
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*/
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#include "misc.h"
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#include "player.h"
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#include "xy.h"
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#include "nsc.h"
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#include "sect.h"
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#include "nat.h"
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#include "prototypes.h"
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#include "optlist.h"
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#define GCFx(x) ((x + WORLD_X) % WORLD_X)
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#define GCFy(y) ((y + WORLD_Y) % WORLD_Y)
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int
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emp_getbit(int x, int y, u_char *bitmap)
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{
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int id;
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id = (GCFy(y)) * WORLD_X/2 + GCFx(x)/2;
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return bitmap[id / 8] & bit(id & 07);
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}
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void
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emp_setbit(int x, int y, u_char *bitmap)
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{
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register int id;
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id = (GCFy(y)) * WORLD_X/2 + GCFx(x)/2;
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bitmap[id / 8] |= bit(id & 07);
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}
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void
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emp_setbitmap(register int x, register int y, register u_char *bitmap, int *bitmaps)
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{
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register int *mp;
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register int id;
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register int dx, dy;
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for (mp = bitmaps; *mp != 9999; ) {
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dx = x + *mp++;
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dy = y + *mp++;
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id = (GCFy(dy)) * WORLD_X/2 + GCFx(dx)/2;
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bitmap[id / 8] |= bit(id & 07);
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}
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}
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/*
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* if we're not player->god, we have to set up the bitmaps
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* correctly for the owned sectors. If we are player->god,
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* forego all this (expensive) nonsense!
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*/
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void
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emp_bitinit(struct nstr_sect *np, u_char *bitmap)
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{
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extern int *bitmaps[];
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struct sctstr sect;
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int eff;
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while (nxtsct(np, §)) {
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if (!player->owner)
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continue;
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eff = sect.sct_effic / 20;
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if (eff > 4)
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eff = 4;
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emp_setbitmap(np->x, np->y, bitmap, bitmaps[eff]);
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}
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snxtsct_rewind(np);
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}
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/*
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*
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* the bit offsets for each bit pattern based on the efficiency of
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* the sector.
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*
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* bitmap0: 0-20%
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* bitmap1: 21-40%
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* bitmap2: 41-60%
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* bitmap3: 61-80%
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* bitmap4: 81-100%
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*/
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#define bitoff(x, y) x, y
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int bitmap0[] = {
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bitoff(-1,-1), bitoff(1,-1),
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bitoff(-2,0), bitoff(0,0), bitoff(2,0),
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bitoff(-1,1), bitoff(1,1),
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bitoff(9999,9999),
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};
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int bitmap1[] = {
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bitoff(0,-2),
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bitoff(-3,-1), bitoff(-1,-1), bitoff(1,-1), bitoff(3,-1),
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bitoff(-2,0), bitoff(0,0), bitoff(2,0),
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bitoff(-3,1), bitoff(-1,1), bitoff(1,1), bitoff(3,1),
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bitoff(0,2),
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bitoff(9999,9999),
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};
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int bitmap2[] = {
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bitoff(-2,-2), bitoff(0,-2), bitoff(2,-2),
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bitoff(-3,-1), bitoff(-1,-1), bitoff(1,-1), bitoff(3,-1),
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bitoff(-4,0), bitoff(-2,0), bitoff(0,0), bitoff(2,0), bitoff(4,0),
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bitoff(-3,1), bitoff(-1,1), bitoff(1,1), bitoff(3,1),
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bitoff(-2,2), bitoff(0,2), bitoff(2,2),
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bitoff(9999,9999),
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};
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int bitmap3[] = {
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bitoff(-1,-3), bitoff(1,-3),
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bitoff(-4,-2), bitoff(-2,-2), bitoff(0,-2), bitoff(2,-2), bitoff(4,-2),
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bitoff(-5,-1), bitoff(-3,-1), bitoff(-1,-1), bitoff(1,-1),
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bitoff(3,-1), bitoff(5,-1),
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bitoff(-4,0), bitoff(-2,0), bitoff(0,0), bitoff(2,0), bitoff(4,0),
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bitoff(-5,1), bitoff(-3,1), bitoff(-1,1), bitoff(1,1),
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bitoff(3,1), bitoff(5,1),
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bitoff(-4,2), bitoff(-2,2), bitoff(0,2), bitoff(2,2), bitoff(4,2),
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bitoff(-1,3), bitoff(1,3),
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bitoff(9999,9999),
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};
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int bitmap4[] = {
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bitoff(-3,-3), bitoff(-1,-3), bitoff(1,-3), bitoff(3,-3),
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bitoff(-4,-2), bitoff(-2,-2), bitoff(0,-2), bitoff(2,-2), bitoff(4,-2),
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bitoff(-5,-1), bitoff(-3,-1), bitoff(-1,-1), bitoff(1,-1),
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bitoff(3,-1), bitoff(5,-1),
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bitoff(-6,0), bitoff(-4,0), bitoff(-2,0), bitoff(0,0), bitoff(2,0),
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bitoff(4,0), bitoff(6,0),
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bitoff(-5,1), bitoff(-3,1), bitoff(-1,1), bitoff(1,1),
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bitoff(3,1), bitoff(5,1),
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bitoff(-4,2), bitoff(-2,2), bitoff(0,2), bitoff(2,2), bitoff(4,2),
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bitoff(-3,3), bitoff(-1,3), bitoff(1,3), bitoff(3, 3),
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bitoff(9999,9999),
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};
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int *bitmaps[5] = {
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bitmap0,
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bitmap1,
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bitmap2,
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bitmap3,
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bitmap4,
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};
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