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+/* Emacs style mode select   -*- C++ -*-
+ *-----------------------------------------------------------------------------
+ *
+ *
+ *  PrBoom: a Doom port merged with LxDoom and LSDLDoom
+ *  based on BOOM, a modified and improved DOOM engine
+ *  Copyright (C) 1999 by
+ *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
+ *  Copyright (C) 1999-2000 by
+ *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
+ *  Copyright 2005, 2006 by
+ *  Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
+ *
+ *  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.
+ *
+ * DESCRIPTION:
+ *      Map Objects, MObj, definition and handling.
+ *
+ *-----------------------------------------------------------------------------*/
+
+#ifndef __P_MOBJ__
+#define __P_MOBJ__
+
+// Basics.
+#include "tables.h"
+#include "m_fixed.h"
+
+// We need the thinker_t stuff.
+#include "d_think.h"
+
+// We need the WAD data structure for Map things,
+// from the THINGS lump.
+#include "doomdata.h"
+
+// States are tied to finite states are
+//  tied to animation frames.
+// Needs precompiled tables/data structures.
+#include "info.h"
+
+//
+// NOTES: mobj_t
+//
+// mobj_ts are used to tell the refresh where to draw an image,
+// tell the world simulation when objects are contacted,
+// and tell the sound driver how to position a sound.
+//
+// The refresh uses the next and prev links to follow
+// lists of things in sectors as they are being drawn.
+// The sprite, frame, and angle elements determine which patch_t
+// is used to draw the sprite if it is visible.
+// The sprite and frame values are allmost allways set
+// from state_t structures.
+// The statescr.exe utility generates the states.h and states.c
+// files that contain the sprite/frame numbers from the
+// statescr.txt source file.
+// The xyz origin point represents a point at the bottom middle
+// of the sprite (between the feet of a biped).
+// This is the default origin position for patch_ts grabbed
+// with lumpy.exe.
+// A walking creature will have its z equal to the floor
+// it is standing on.
+//
+// The sound code uses the x,y, and subsector fields
+// to do stereo positioning of any sound effited by the mobj_t.
+//
+// The play simulation uses the blocklinks, x,y,z, radius, height
+// to determine when mobj_ts are touching each other,
+// touching lines in the map, or hit by trace lines (gunshots,
+// lines of sight, etc).
+// The mobj_t->flags element has various bit flags
+// used by the simulation.
+//
+// Every mobj_t is linked into a single sector
+// based on its origin coordinates.
+// The subsector_t is found with R_PointInSubsector(x,y),
+// and the sector_t can be found with subsector->sector.
+// The sector links are only used by the rendering code,
+// the play simulation does not care about them at all.
+//
+// Any mobj_t that needs to be acted upon by something else
+// in the play world (block movement, be shot, etc) will also
+// need to be linked into the blockmap.
+// If the thing has the MF_NOBLOCK flag set, it will not use
+// the block links. It can still interact with other things,
+// but only as the instigator (missiles will run into other
+// things, but nothing can run into a missile).
+// Each block in the grid is 128*128 units, and knows about
+// every line_t that it contains a piece of, and every
+// interactable mobj_t that has its origin contained.
+//
+// A valid mobj_t is a mobj_t that has the proper subsector_t
+// filled in for its xy coordinates and is linked into the
+// sector from which the subsector was made, or has the
+// MF_NOSECTOR flag set (the subsector_t needs to be valid
+// even if MF_NOSECTOR is set), and is linked into a blockmap
+// block or has the MF_NOBLOCKMAP flag set.
+// Links should only be modified by the P_[Un]SetThingPosition()
+// functions.
+// Do not change the MF_NO? flags while a thing is valid.
+//
+// Any questions?
+//
+
+//
+// Misc. mobj flags
+//
+
+// Call P_SpecialThing when touched.
+#define MF_SPECIAL      (uint_64_t)(0x0000000000000001)
+// Blocks.
+#define MF_SOLID        (uint_64_t)(0x0000000000000002)
+// Can be hit.
+#define MF_SHOOTABLE    (uint_64_t)(0x0000000000000004)
+// Don't use the sector links (invisible but touchable).
+#define MF_NOSECTOR     (uint_64_t)(0x0000000000000008)
+// Don't use the blocklinks (inert but displayable)
+#define MF_NOBLOCKMAP   (uint_64_t)(0x0000000000000010)
+
+// Not to be activated by sound, deaf monster.
+#define MF_AMBUSH       (uint_64_t)(0x0000000000000020)
+// Will try to attack right back.
+#define MF_JUSTHIT      (uint_64_t)(0x0000000000000040)
+// Will take at least one step before attacking.
+#define MF_JUSTATTACKED (uint_64_t)(0x0000000000000080)
+// On level spawning (initial position),
+//  hang from ceiling instead of stand on floor.
+#define MF_SPAWNCEILING (uint_64_t)(0x0000000000000100)
+// Don't apply gravity (every tic),
+//  that is, object will float, keeping current height
+//  or changing it actively.
+#define MF_NOGRAVITY    (uint_64_t)(0x0000000000000200)
+
+// Movement flags.
+// This allows jumps from high places.
+#define MF_DROPOFF      (uint_64_t)(0x0000000000000400)
+// For players, will pick up items.
+#define MF_PICKUP       (uint_64_t)(0x0000000000000800)
+// Player cheat. ???
+#define MF_NOCLIP       (uint_64_t)(0x0000000000001000)
+// Player: keep info about sliding along walls.
+#define MF_SLIDE        (uint_64_t)(0x0000000000002000)
+// Allow moves to any height, no gravity.
+// For active floaters, e.g. cacodemons, pain elementals.
+#define MF_FLOAT        (uint_64_t)(0x0000000000004000)
+// Don't cross lines
+//   ??? or look at heights on teleport.
+#define MF_TELEPORT     (uint_64_t)(0x0000000000008000)
+// Don't hit same species, explode on block.
+// Player missiles as well as fireballs of various kinds.
+#define MF_MISSILE      (uint_64_t)(0x0000000000010000)
+// Dropped by a demon, not level spawned.
+// E.g. ammo clips dropped by dying former humans.
+#define MF_DROPPED      (uint_64_t)(0x0000000000020000)
+// Use fuzzy draw (shadow demons or spectres),
+//  temporary player invisibility powerup.
+#define MF_SHADOW       (uint_64_t)(0x0000000000040000)
+// Flag: don't bleed when shot (use puff),
+//  barrels and shootable furniture shall not bleed.
+#define MF_NOBLOOD      (uint_64_t)(0x0000000000080000)
+// Don't stop moving halfway off a step,
+//  that is, have dead bodies slide down all the way.
+#define MF_CORPSE       (uint_64_t)(0x0000000000100000)
+// Floating to a height for a move, ???
+//  don't auto float to target's height.
+#define MF_INFLOAT      (uint_64_t)(0x0000000000200000)
+
+// On kill, count this enemy object
+//  towards intermission kill total.
+// Happy gathering.
+#define MF_COUNTKILL    (uint_64_t)(0x0000000000400000)
+
+// On picking up, count this item object
+//  towards intermission item total.
+#define MF_COUNTITEM    (uint_64_t)(0x0000000000800000)
+
+// Special handling: skull in flight.
+// Neither a cacodemon nor a missile.
+#define MF_SKULLFLY     (uint_64_t)(0x0000000001000000)
+
+// Don't spawn this object
+//  in death match mode (e.g. key cards).
+#define MF_NOTDMATCH    (uint_64_t)(0x0000000002000000)
+
+// Player sprites in multiplayer modes are modified
+//  using an internal color lookup table for re-indexing.
+// If 0x4 0x8 or 0xc,
+//  use a translation table for player colormaps
+#define MF_TRANSLATION  (uint_64_t)(0x000000000c000000)
+#define MF_TRANSLATION1 (uint_64_t)(0x0000000004000000)
+#define MF_TRANSLATION2 (uint_64_t)(0x0000000008000000)
+// Hmm ???.
+#define MF_TRANSSHIFT 26
+
+#define MF_UNUSED2      (uint_64_t)(0x0000000010000000)
+#define MF_UNUSED3      (uint_64_t)(0x0000000020000000)
+
+    // Translucent sprite?                                          // phares
+#define MF_TRANSLUCENT  (uint_64_t)(0x0000000040000000)
+
+// this is free            LONGLONG(0x0000000100000000)
+
+// these are greater than an int. That's why the flags below are now uint_64_t
+
+#define MF_TOUCHY          LONGLONG(0x0000000100000000)
+#define MF_BOUNCES         LONGLONG(0x0000000200000000)
+#define MF_FRIEND          LONGLONG(0x0000000400000000)
+
+// killough 9/15/98: Same, but internal flags, not intended for .deh
+// (some degree of opaqueness is good, to avoid compatibility woes)
+
+enum {
+  MIF_FALLING = 1,      // Object is falling
+  MIF_ARMED = 2,        // Object is armed (for MF_TOUCHY objects)
+};
+
+// Map Object definition.
+//
+//
+// killough 2/20/98:
+//
+// WARNING: Special steps must be taken in p_saveg.c if C pointers are added to
+// this mobj_s struct, or else savegames will crash when loaded. See p_saveg.c.
+// Do not add "struct mobj_s *fooptr" without adding code to p_saveg.c to
+// convert the pointers to ordinals and back for savegames. This was the whole
+// reason behind monsters going to sleep when loading savegames (the "target"
+// pointer was simply nullified after loading, to prevent Doom from crashing),
+// and the whole reason behind loadgames crashing on savegames of AV attacks.
+//
+
+// killough 9/8/98: changed some fields to shorts,
+// for better memory usage (if only for cache).
+/* cph 2006/08/28 - move Prev[XYZ] fields to the end of the struct. Add any
+ * other new fields to the end, and make sure you don't break savegames! */
+
+typedef struct mobj_s
+{
+    // List: thinker links.
+    thinker_t           thinker;
+
+    // Info for drawing: position.
+    fixed_t             x;
+    fixed_t             y;
+    fixed_t             z;
+
+    // More list: links in sector (if needed)
+    struct mobj_s*      snext;
+    struct mobj_s**     sprev; // killough 8/10/98: change to ptr-to-ptr
+
+    //More drawing info: to determine current sprite.
+    angle_t             angle;  // orientation
+    spritenum_t         sprite; // used to find patch_t and flip value
+    int                 frame;  // might be ORed with FF_FULLBRIGHT
+
+    // Interaction info, by BLOCKMAP.
+    // Links in blocks (if needed).
+    struct mobj_s*      bnext;
+    struct mobj_s**     bprev; // killough 8/11/98: change to ptr-to-ptr
+
+    struct subsector_s* subsector;
+
+    // The closest interval over all contacted Sectors.
+    fixed_t             floorz;
+    fixed_t             ceilingz;
+
+    // killough 11/98: the lowest floor over all contacted Sectors.
+    fixed_t             dropoffz;
+
+    // For movement checking.
+    fixed_t             radius;
+    fixed_t             height;
+
+    // Momentums, used to update position.
+    fixed_t             momx;
+    fixed_t             momy;
+    fixed_t             momz;
+
+    // If == validcount, already checked.
+    int                 validcount;
+
+    mobjtype_t          type;
+    mobjinfo_t*         info;   // &mobjinfo[mobj->type]
+
+    int                 tics;   // state tic counter
+    state_t*            state;
+    uint_64_t           flags;
+    int                 intflags;  // killough 9/15/98: internal flags
+    int                 health;
+
+    // Movement direction, movement generation (zig-zagging).
+    short               movedir;        // 0-7
+    short               movecount;      // when 0, select a new dir
+    short               strafecount;    // killough 9/8/98: monster strafing
+
+    // Thing being chased/attacked (or NULL),
+    // also the originator for missiles.
+    struct mobj_s*      target;
+
+    // Reaction time: if non 0, don't attack yet.
+    // Used by player to freeze a bit after teleporting.
+    short               reactiontime;
+
+    // If >0, the current target will be chased no
+    // matter what (even if shot by another object)
+    short               threshold;
+
+    // killough 9/9/98: How long a monster pursues a target.
+    short               pursuecount;
+
+    short               gear; // killough 11/98: used in torque simulation
+
+    // Additional info record for player avatars only.
+    // Only valid if type == MT_PLAYER
+    struct player_s*    player;
+
+    // Player number last looked for.
+    short               lastlook;
+
+    // For nightmare respawn.
+    mapthing_t          spawnpoint;
+
+    // Thing being chased/attacked for tracers.
+    struct mobj_s*      tracer;
+
+    // new field: last known enemy -- killough 2/15/98
+    struct mobj_s*      lastenemy;
+
+    // killough 8/2/98: friction properties part of sectors,
+    // not objects -- removed friction properties from here
+    // e6y: restored friction properties here
+    // Friction values for the sector the object is in
+    int friction;                                           // phares 3/17/98
+    int movefactor;
+
+    // a linked list of sectors where this object appears
+    struct msecnode_s* touching_sectorlist;                 // phares 3/14/98
+
+    fixed_t             PrevX;
+    fixed_t             PrevY;
+    fixed_t             PrevZ;
+
+    fixed_t             pad; // cph - needed so I can get the size unambiguously on amd64
+
+    // SEE WARNING ABOVE ABOUT POINTER FIELDS!!!
+} mobj_t;
+
+// External declarations (fomerly in p_local.h) -- killough 5/2/98
+
+#define VIEWHEIGHT      (41*FRACUNIT)
+
+#define GRAVITY         FRACUNIT
+#define MAXMOVE         (30*FRACUNIT)
+
+#define ONFLOORZ        INT_MIN
+#define ONCEILINGZ      INT_MAX
+
+// Time interval for item respawning.
+#define ITEMQUESIZE     128
+
+#define FLOATSPEED      (FRACUNIT*4)
+#define STOPSPEED       (FRACUNIT/16)
+
+// killough 11/98:
+// For torque simulation:
+
+#define OVERDRIVE 6
+#define MAXGEAR (OVERDRIVE+16)
+
+// killough 11/98:
+// Whether an object is "sentient" or not. Used for environmental influences.
+#define sentient(mobj) ((mobj)->health > 0 && (mobj)->info->seestate)
+
+extern int iquehead;
+extern int iquetail;
+
+void    P_RespawnSpecials(void);
+mobj_t  *P_SpawnMobj(fixed_t x, fixed_t y, fixed_t z, mobjtype_t type);
+void    P_RemoveMobj(mobj_t *th);
+boolean P_SetMobjState(mobj_t *mobj, statenum_t state);
+void    P_MobjThinker(mobj_t *mobj);
+void    P_SpawnPuff(fixed_t x, fixed_t y, fixed_t z);
+void    P_SpawnBlood(fixed_t x, fixed_t y, fixed_t z, int damage);
+mobj_t  *P_SpawnMissile(mobj_t *source, mobj_t *dest, mobjtype_t type);
+void    P_SpawnPlayerMissile(mobj_t *source, mobjtype_t type);
+boolean P_IsDoomnumAllowed(int doomnum);
+void    P_SpawnMapThing (const mapthing_t*  mthing);
+void    P_SpawnPlayer(int n, const mapthing_t *mthing);
+void    P_CheckMissileSpawn(mobj_t*);  // killough 8/2/98
+void    P_ExplodeMissile(mobj_t*);    // killough
+#endif
+