Markus Armbruster
7e2008e7f4
Why upgrade? I'm not a lawyer, but here's my take on the differences to version 2: * Software patents: better protection against abuse of patents to prevent users from exercising the rights under the GPL. I doubt we'll get hit with a patent suit, but it's a good move just on general principles. * License compatibility: compatible with more free licenses, i.e. can "steal" more free software for use in Empire. I don't expect to steal much, but it's nice to have the option. * Definition of "source code": modernization of some details for today's networked world, to make it easier to distribute the software. Not really relevant to us now, as we normally distribute full source code. * Tivoization: this is about putting GPL-licensed software in hardware, then make the hardware refuse to run modified software. "Neat" trick to effectively deny its users their rights under the GPL. Abuse was "pioneered" by TiVo (popular digital video recorders). GPLv3 forbids it. Unlikely to become a problem for us. * Internationalization: more careful wording, to harden the license outside the US. The lawyers tell us it better be done that way. * License violations: friendlier way to deal with license violations. This has come out of past experience enforcing the GPL. * Additional permissions: Probably not relevant to us. Also include myself in the list of principal authors.
98 lines
3 KiB
C
98 lines
3 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2011, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure, Markus Armbruster
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*
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* Empire 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 3 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, see <http://www.gnu.org/licenses/>.
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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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* path.h: Definitions for directions, paths, etc.
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*
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* Known contributors to this file:
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*
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*/
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#ifndef PATH_H
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#define PATH_H
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#include "types.h"
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/* direction indices */
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#define DIR_STOP 0
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#define DIR_UR 1
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#define DIR_R 2
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#define DIR_DR 3
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#define DIR_DL 4
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#define DIR_L 5
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#define DIR_UL 6
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#define DIR_VIEW 7
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#define DIR_MAP 8
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#define DIR_FIRST 1
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#define DIR_LAST 6
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#define MOB_MOVE 0
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#define MOB_MARCH 1
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#define MOB_RAIL 2
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enum p_mode { /* How to find path to destination */
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P_NONE, /* don't */
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P_FLYING, /* use BestAirPath() */
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P_SAILING /* use BestShipPath() */
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};
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/* src/lib/global/dir.c */
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extern signed char dirindex['z'-'a'+1];
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extern int diroff[DIR_MAP+1][2];
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extern char dirch[DIR_MAP+2];
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extern char *routech[DIR_LAST+1];
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/* src/lib/common/bestpath.c */
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extern char *bestownedpath(char *, char *, int, int, int, int, int);
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/* src/lib/common/path.c */
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extern void bp_enable_cachepath(void);
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extern void bp_disable_cachepath(void);
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extern void bp_clear_cachepath(void);
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extern char *BestDistPath(char *, struct sctstr *, struct sctstr *,
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double *);
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extern char *BestLandPath(char *, struct sctstr *, struct sctstr *,
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double *, int);
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extern char *BestShipPath(char *, int, int, int, int, int);
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extern char *BestAirPath(char *, int, int, int, int);
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extern double pathcost(struct sctstr *, char *, int);
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/* src/lib/subs/paths.c */
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extern char *getpath(char *, char *, coord, coord, int, int, enum p_mode);
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extern double fcost(struct sctstr *, natid);
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extern double ncost(struct sctstr *, natid);
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extern double pathtoxy(char *, coord *, coord *,
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double (*)(struct sctstr *, natid));
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extern int chkdir(char, int, int);
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extern int diridx(char);
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extern void direrr(char *, char *, char *);
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extern void pathrange(coord, coord, char *, int, struct range *);
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extern double sector_mcost(struct sctstr *, int);
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extern double speed_factor(double, int);
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#define MAX_PATH_LEN 1024
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#endif
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