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// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005-2014 Simon Howard
// 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
// GNU General Public License for more details.
// 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
typedef enum
// Call P_SpecialThing when touched.
// Blocks.
// Can be hit.
// Don't use the sector links (invisible but touchable).
// Don't use the blocklinks (inert but displayable)
// Not to be activated by sound, deaf monster.
// Will try to attack right back.
// Will take at least one step before attacking.
// On level spawning (initial position),
// hang from ceiling instead of stand on floor.
// Don't apply gravity (every tic),
// that is, object will float, keeping current height
// or changing it actively.
// Movement flags.
// This allows jumps from high places.
MF_DROPOFF = 0x400,
// For players, will pick up items.
MF_PICKUP = 0x800,
// Player cheat. ???
MF_NOCLIP = 0x1000,
// Player: keep info about sliding along walls.
MF_SLIDE = 0x2000,
// Allow moves to any height, no gravity.
// For active floaters, e.g. cacodemons, pain elementals.
MF_FLOAT = 0x4000,
// Don't cross lines
// ??? or look at heights on teleport.
MF_TELEPORT = 0x8000,
// Don't hit same species, explode on block.
// Player missiles as well as fireballs of various kinds.
MF_MISSILE = 0x10000,
// Dropped by a demon, not level spawned.
// E.g. ammo clips dropped by dying former humans.
MF_DROPPED = 0x20000,
// Use fuzzy draw (shadow demons or spectres),
// temporary player invisibility powerup.
MF_SHADOW = 0x40000,
// Flag: don't bleed when shot (use puff),
// barrels and shootable furniture shall not bleed.
MF_NOBLOOD = 0x80000,
// Don't stop moving halfway off a step,
// that is, have dead bodies slide down all the way.
MF_CORPSE = 0x100000,
// Floating to a height for a move, ???
// don't auto float to target's height.
MF_INFLOAT = 0x200000,
// On kill, count this enemy object
// towards intermission kill total.
// Happy gathering.
MF_COUNTKILL = 0x400000,
// On picking up, count this item object
// towards intermission item total.
MF_COUNTITEM = 0x800000,
// Special handling: skull in flight.
// Neither a cacodemon nor a missile.
MF_SKULLFLY = 0x1000000,
// Don't spawn this object
// in death match mode (e.g. key cards).
MF_NOTDMATCH = 0x2000000,
// 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
MF_TRANSLATION = 0xc000000,
// Hmm ???.
} mobjflag_t;
// Map Object definition.
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;
//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;
struct subsector_s* subsector;
// The closest interval over all contacted Sectors.
fixed_t floorz;
fixed_t ceilingz;
// 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;
int flags;
int health;
// Movement direction, movement generation (zig-zagging).
int movedir; // 0-7
int movecount; // when 0, select a new dir
// 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.
int reactiontime;
// If >0, the target will be chased
// no matter what (even if shot)
int threshold;
// Additional info record for player avatars only.
// Only valid if type == MT_PLAYER
struct player_s* player;
// Player number last looked for.
int lastlook;
// For nightmare respawn.
mapthing_t spawnpoint;
// Thing being chased/attacked for tracers.
struct mobj_s* tracer;
// uniquely identify this object. (incremented for each new mobj spawned)
int id;
} mobj_t;
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