ref: 5781718e4d025711c24f6db2eaea14de2d17fec9
dir: /p_map.c/
// P_map.c
#include "h2stdinc.h"
#include "doomdef.h"
#include "p_local.h"
#include "soundst.h"
/*
===============================================================================
NOTES:
===============================================================================
*/
/*
===============================================================================
mobj_t NOTES
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 it's 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 be 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 it's origin contained.
A valid mobj_t is a mobj_t that has the proper subsector_t filled in for it's
xy coordinates and is linked into the subsector's sector 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.
===============================================================================
*/
extern fixed_t topslope, bottomslope; /* slopes to top and bottom of target */
static fixed_t tmbbox[4];
static mobj_t *tmthing;
static int tmflags;
static fixed_t tmx, tmy;
static mobj_t *onmobj; /* used for landing on pods/players */
boolean floatok; /* if true, move would be ok if */
/* within tmfloorz - tmceilingz */
fixed_t tmfloorz, tmceilingz, tmdropoffz;
line_t *ceilingline; /* keep track of the line that lowers the ceiling, */
/* so missiles don't explode against sky hack walls */
#define MAXSPECIALCROSS 8
line_t *spechit[MAXSPECIALCROSS]; /* keep track of special lines as they are hit, */
int numspechit; /* but don't process them until the move is proven valid */
/*
===============================================================================
TELEPORT MOVE
===============================================================================
*/
/*
==================
=
= PIT_StompThing
=
==================
*/
static boolean PIT_StompThing (mobj_t *thing)
{
fixed_t blockdist;
if (!(thing->flags & MF_SHOOTABLE) )
return true;
blockdist = thing->radius + tmthing->radius;
if ( abs(thing->x - tmx) >= blockdist || abs(thing->y - tmy) >= blockdist )
return true; // didn't hit it
if (thing == tmthing)
return true; // don't clip against self
if (!(tmthing->flags2 & MF2_TELESTOMP))
{ // Not allowed to stomp things
return false;
}
P_DamageMobj (thing, tmthing, tmthing, 10000);
return true;
}
/*
===================
=
= P_TeleportMove
=
===================
*/
boolean P_TeleportMove (mobj_t *thing, fixed_t x, fixed_t y)
{
int xl, xh, yl, yh, bx, by;
subsector_t *newsubsec;
//
// kill anything occupying the position
//
tmthing = thing;
tmflags = thing->flags;
tmx = x;
tmy = y;
tmbbox[BOXTOP] = y + tmthing->radius;
tmbbox[BOXBOTTOM] = y - tmthing->radius;
tmbbox[BOXRIGHT] = x + tmthing->radius;
tmbbox[BOXLEFT] = x - tmthing->radius;
newsubsec = R_PointInSubsector (x, y);
ceilingline = NULL;
//
// the base floor / ceiling is from the subsector that contains the
// point. Any contacted lines the step closer together will adjust them
//
tmfloorz = tmdropoffz = newsubsec->sector->floorheight;
tmceilingz = newsubsec->sector->ceilingheight;
validcount++;
numspechit = 0;
//
// stomp on any things contacted
//
xl = (tmbbox[BOXLEFT] - bmaporgx - MAXRADIUS)>>MAPBLOCKSHIFT;
xh = (tmbbox[BOXRIGHT] - bmaporgx + MAXRADIUS)>>MAPBLOCKSHIFT;
yl = (tmbbox[BOXBOTTOM] - bmaporgy - MAXRADIUS)>>MAPBLOCKSHIFT;
yh = (tmbbox[BOXTOP] - bmaporgy + MAXRADIUS)>>MAPBLOCKSHIFT;
for (bx = xl; bx <= xh; bx++)
{
for (by = yl; by <= yh; by++)
{
if (!P_BlockThingsIterator(bx, by, PIT_StompThing))
return false;
}
}
//
// the move is ok, so link the thing into its new position
//
P_UnsetThingPosition (thing);
thing->floorz = tmfloorz;
thing->ceilingz = tmceilingz;
thing->x = x;
thing->y = y;
P_SetThingPosition (thing);
return true;
}
/*
===============================================================================
MOVEMENT ITERATOR FUNCTIONS
===============================================================================
*/
/*
==================
=
= PIT_CheckLine
=
= Adjusts tmfloorz and tmceilingz as lines are contacted
==================
*/
static boolean PIT_CheckLine(line_t *ld)
{
if (tmbbox[BOXRIGHT] <= ld->bbox[BOXLEFT]
|| tmbbox[BOXLEFT] >= ld->bbox[BOXRIGHT]
|| tmbbox[BOXTOP] <= ld->bbox[BOXBOTTOM]
|| tmbbox[BOXBOTTOM] >= ld->bbox[BOXTOP])
{
return true;
}
if (P_BoxOnLineSide(tmbbox, ld) != -1)
{
return true;
}
// a line has been hit
/*
= The moving thing's destination position will cross the given line.
= If this should not be allowed, return false.
= If the line is special, keep track of it to process later if the move
= is proven ok. NOTE: specials are NOT sorted by order, so two special
= lines that are only 8 pixels apart could be crossed in either order.
*/
if (!ld->backsector)
{ // One sided line
if (tmthing->flags & MF_MISSILE)
{ // Missiles can trigger impact specials
if (ld->special)
{
spechit[numspechit] = ld;
numspechit++;
}
}
return false;
}
if (!(tmthing->flags & MF_MISSILE))
{
if (ld->flags & ML_BLOCKING)
{ // Explicitly blocking everything
return false;
}
if (!tmthing->player && ld->flags & ML_BLOCKMONSTERS
&& tmthing->type != MT_POD)
{ // Block monsters only
return false;
}
}
P_LineOpening(ld); // set openrange, opentop, openbottom
// adjust floor / ceiling heights
if (opentop < tmceilingz)
{
tmceilingz = opentop;
ceilingline = ld;
}
if (openbottom > tmfloorz)
{
tmfloorz = openbottom;
}
if (lowfloor < tmdropoffz)
{
tmdropoffz = lowfloor;
}
if (ld->special)
{ // Contacted a special line, add it to the list
spechit[numspechit] = ld;
numspechit++;
}
return true;
}
//---------------------------------------------------------------------------
//
// FUNC PIT_CheckThing
//
//---------------------------------------------------------------------------
static boolean PIT_CheckThing(mobj_t *thing)
{
fixed_t blockdist;
boolean solid;
int damage;
if (!(thing->flags & (MF_SOLID|MF_SPECIAL|MF_SHOOTABLE)))
{ // Can't hit thing
return true;
}
blockdist = thing->radius + tmthing->radius;
if (abs(thing->x - tmx) >= blockdist || abs(thing->y - tmy) >= blockdist)
{ // Didn't hit thing
return true;
}
if (thing == tmthing)
{ // Don't clip against self
return true;
}
if (tmthing->flags2 & MF2_PASSMOBJ)
{ // check if a mobj passed over/under another object
if ((tmthing->type == MT_IMP || tmthing->type == MT_WIZARD)
&& (thing->type == MT_IMP || thing->type == MT_WIZARD))
{ // don't let imps/wizards fly over other imps/wizards
return false;
}
if (tmthing->z > thing->z + thing->height
&& !(thing->flags & MF_SPECIAL))
{
return true;
}
else if (tmthing->z + tmthing->height < thing->z
&& !(thing->flags & MF_SPECIAL))
{ // under thing
return true;
}
}
// Check for skulls slamming into things
if (tmthing->flags & MF_SKULLFLY)
{
damage = ((P_Random() % 8) + 1) * tmthing->damage;
P_DamageMobj(thing, tmthing, tmthing, damage);
tmthing->flags &= ~MF_SKULLFLY;
tmthing->momx = tmthing->momy = tmthing->momz = 0;
P_SetMobjState(tmthing, tmthing->info->seestate);
return false;
}
// Check for missile
if (tmthing->flags & MF_MISSILE)
{
// Check for passing through a ghost
if ((thing->flags & MF_SHADOW) && (tmthing->flags2 & MF2_THRUGHOST))
{
return true;
}
// Check if it went over / under
if (tmthing->z > thing->z + thing->height)
{ // Over thing
return true;
}
if (tmthing->z + tmthing->height < thing->z)
{ // Under thing
return true;
}
if (tmthing->target && tmthing->target->type == thing->type)
{ // Don't hit same species as originator
if (thing == tmthing->target)
{ // Don't missile self
return true;
}
if (thing->type != MT_PLAYER)
{ // Hit same species as originator, explode, no damage
return false;
}
}
if (!(thing->flags & MF_SHOOTABLE))
{ // Didn't do any damage
return !(thing->flags & MF_SOLID);
}
if (tmthing->flags2 & MF2_RIP)
{
if (!(thing->flags & MF_NOBLOOD))
{ // Ok to spawn some blood
P_RipperBlood(tmthing);
}
S_StartSound(tmthing, sfx_ripslop);
damage = ((P_Random() & 3) + 2) * tmthing->damage;
P_DamageMobj(thing, tmthing, tmthing->target, damage);
if (thing->flags2 & MF2_PUSHABLE
&& !(tmthing->flags2 & MF2_CANNOTPUSH))
{ // Push thing
thing->momx += tmthing->momx>>2;
thing->momy += tmthing->momy>>2;
}
numspechit = 0;
return true;
}
// Do damage
damage = ((P_Random() % 8) + 1) * tmthing->damage;
if (damage)
{
if (!(thing->flags & MF_NOBLOOD) && P_Random() < 192)
{
P_BloodSplatter(tmthing->x, tmthing->y, tmthing->z, thing);
}
P_DamageMobj(thing, tmthing, tmthing->target, damage);
}
return false;
}
if (thing->flags2 & MF2_PUSHABLE && !(tmthing->flags2 & MF2_CANNOTPUSH))
{ // Push thing
thing->momx += tmthing->momx>>2;
thing->momy += tmthing->momy>>2;
}
// Check for special thing
if (thing->flags & MF_SPECIAL)
{
solid = thing->flags & MF_SOLID;
if (tmflags & MF_PICKUP)
{ // Can be picked up by tmthing
P_TouchSpecialThing(thing, tmthing); // Can remove thing
}
return !solid;
}
return !(thing->flags & MF_SOLID);
}
//---------------------------------------------------------------------------
//
// PIT_CheckOnmobjZ
//
//---------------------------------------------------------------------------
static boolean PIT_CheckOnmobjZ(mobj_t *thing)
{
fixed_t blockdist;
if (!(thing->flags & (MF_SOLID|MF_SPECIAL|MF_SHOOTABLE)))
{ // Can't hit thing
return true;
}
blockdist = thing->radius + tmthing->radius;
if (abs(thing->x - tmx) >= blockdist || abs(thing->y - tmy) >= blockdist)
{ // Didn't hit thing
return true;
}
if (thing == tmthing)
{ // Don't clip against self
return true;
}
if (tmthing->z > thing->z + thing->height)
{
return true;
}
else if (tmthing->z + tmthing->height < thing->z)
{ // under thing
return true;
}
if (thing->flags & MF_SOLID)
{
onmobj = thing;
}
return !(thing->flags & MF_SOLID);
}
/*
===============================================================================
MOVEMENT CLIPPING
===============================================================================
*/
//----------------------------------------------------------------------------
//
// FUNC P_TestMobjLocation
//
// Returns true if the mobj is not blocked by anything at its current
// location, otherwise returns false.
//
//----------------------------------------------------------------------------
boolean P_TestMobjLocation(mobj_t *mobj)
{
int flags;
flags = mobj->flags;
mobj->flags &= ~MF_PICKUP;
if (P_CheckPosition(mobj, mobj->x, mobj->y))
{ // XY is ok, now check Z
mobj->flags = flags;
if ((mobj->z < mobj->floorz)
|| (mobj->z + mobj->height > mobj->ceilingz))
{ // Bad Z
return false;
}
return true;
}
mobj->flags = flags;
return false;
}
/*
==================
=
= P_CheckPosition
=
= This is purely informative, nothing is modified (except things picked up)
in:
a mobj_t (can be valid or invalid)
a position to be checked (doesn't need to be related to the mobj_t->x,y)
during:
special things are touched if MF_PICKUP
early out on solid lines?
out:
newsubsec
floorz
ceilingz
tmdropoffz = the lowest point contacted (monsters won't move to a dropoff)
speciallines[]
numspeciallines
==================
*/
boolean P_CheckPosition (mobj_t *thing, fixed_t x, fixed_t y)
{
int xl, xh, yl, yh, bx, by;
subsector_t *newsubsec;
tmthing = thing;
tmflags = thing->flags;
tmx = x;
tmy = y;
tmbbox[BOXTOP] = y + tmthing->radius;
tmbbox[BOXBOTTOM] = y - tmthing->radius;
tmbbox[BOXRIGHT] = x + tmthing->radius;
tmbbox[BOXLEFT] = x - tmthing->radius;
newsubsec = R_PointInSubsector (x, y);
ceilingline = NULL;
//
// the base floor / ceiling is from the subsector that contains the
// point. Any contacted lines the step closer together will adjust them
//
tmfloorz = tmdropoffz = newsubsec->sector->floorheight;
tmceilingz = newsubsec->sector->ceilingheight;
validcount++;
numspechit = 0;
if (tmflags & MF_NOCLIP)
{
return true;
}
//
// check things first, possibly picking things up
// the bounding box is extended by MAXRADIUS because mobj_ts are grouped
// into mapblocks based on their origin point, and can overlap into adjacent
// blocks by up to MAXRADIUS units
//
xl = (tmbbox[BOXLEFT] - bmaporgx - MAXRADIUS)>>MAPBLOCKSHIFT;
xh = (tmbbox[BOXRIGHT] - bmaporgx + MAXRADIUS)>>MAPBLOCKSHIFT;
yl = (tmbbox[BOXBOTTOM] - bmaporgy - MAXRADIUS)>>MAPBLOCKSHIFT;
yh = (tmbbox[BOXTOP] - bmaporgy + MAXRADIUS)>>MAPBLOCKSHIFT;
for (bx = xl; bx <= xh; bx++)
{
for (by = yl; by <= yh; by++)
{
if (!P_BlockThingsIterator(bx, by, PIT_CheckThing))
return false;
}
}
//
// check lines
//
xl = (tmbbox[BOXLEFT] - bmaporgx)>>MAPBLOCKSHIFT;
xh = (tmbbox[BOXRIGHT] - bmaporgx)>>MAPBLOCKSHIFT;
yl = (tmbbox[BOXBOTTOM] - bmaporgy)>>MAPBLOCKSHIFT;
yh = (tmbbox[BOXTOP] - bmaporgy)>>MAPBLOCKSHIFT;
for (bx = xl; bx <= xh; bx++)
{
for (by = yl; by <= yh; by++)
{
if (!P_BlockLinesIterator (bx, by, PIT_CheckLine))
return false;
}
}
return true;
}
//=============================================================================
//
// P_CheckOnmobj(mobj_t *thing)
//
// Checks if the new Z position is legal
//=============================================================================
mobj_t *P_CheckOnmobj(mobj_t *thing)
{
int xl, xh, yl, yh, bx, by;
subsector_t *newsubsec;
fixed_t x;
fixed_t y;
mobj_t oldmo;
x = thing->x;
y = thing->y;
tmthing = thing;
tmflags = thing->flags;
oldmo = *thing; // save the old mobj before the fake zmovement
P_FakeZMovement(tmthing);
tmx = x;
tmy = y;
tmbbox[BOXTOP] = y + tmthing->radius;
tmbbox[BOXBOTTOM] = y - tmthing->radius;
tmbbox[BOXRIGHT] = x + tmthing->radius;
tmbbox[BOXLEFT] = x - tmthing->radius;
newsubsec = R_PointInSubsector (x, y);
ceilingline = NULL;
//
// the base floor / ceiling is from the subsector that contains the
// point. Any contacted lines the step closer together will adjust them
//
tmfloorz = tmdropoffz = newsubsec->sector->floorheight;
tmceilingz = newsubsec->sector->ceilingheight;
validcount++;
numspechit = 0;
if (tmflags & MF_NOCLIP)
return NULL;
//
// check things first, possibly picking things up
// the bounding box is extended by MAXRADIUS because mobj_ts are grouped
// into mapblocks based on their origin point, and can overlap into adjacent
// blocks by up to MAXRADIUS units
//
xl = (tmbbox[BOXLEFT] - bmaporgx - MAXRADIUS)>>MAPBLOCKSHIFT;
xh = (tmbbox[BOXRIGHT] - bmaporgx + MAXRADIUS)>>MAPBLOCKSHIFT;
yl = (tmbbox[BOXBOTTOM] - bmaporgy - MAXRADIUS)>>MAPBLOCKSHIFT;
yh = (tmbbox[BOXTOP] - bmaporgy + MAXRADIUS)>>MAPBLOCKSHIFT;
for (bx = xl; bx <= xh; bx++)
{
for (by = yl; by <= yh; by++)
{
if (!P_BlockThingsIterator(bx, by, PIT_CheckOnmobjZ))
{
*tmthing = oldmo;
return onmobj;
}
}
}
*tmthing = oldmo;
return NULL;
}
//=============================================================================
//
// P_FakeZMovement
//
// Fake the zmovement so that we can check if a move is legal
//=============================================================================
void P_FakeZMovement(mobj_t *mo)
{
int dist;
int delta;
//
// adjust height
//
mo->z += mo->momz;
if (mo->flags & MF_FLOAT && mo->target)
{ // float down towards target if too close
if (!(mo->flags & MF_SKULLFLY) && !(mo->flags & MF_INFLOAT))
{
dist = P_AproxDistance(mo->x - mo->target->x, mo->y - mo->target->y);
delta = (mo->target->z + (mo->height >> 1) ) - mo->z;
if (delta < 0 && dist < -(delta*3))
mo->z -= FLOATSPEED;
else if (delta > 0 && dist < (delta*3))
mo->z += FLOATSPEED;
}
}
if (mo->player && mo->flags2 & MF2_FLY && !(mo->z <= mo->floorz)
&& leveltime & 2)
{
mo->z += finesine[(FINEANGLES/20*leveltime>>2) & FINEMASK];
}
//
// clip movement
//
if (mo->z <= mo->floorz)
{ // Hit the floor
mo->z = mo->floorz;
if (mo->momz < 0)
{
mo->momz = 0;
}
if (mo->flags & MF_SKULLFLY)
{ // The skull slammed into something
mo->momz = -mo->momz;
}
if (mo->info->crashstate && (mo->flags & MF_CORPSE))
{
return;
}
}
else if (mo->flags2 & MF2_LOGRAV)
{
if (mo->momz == 0)
mo->momz = -(GRAVITY>>3)*2;
else
mo->momz -= GRAVITY>>3;
}
else if (! (mo->flags & MF_NOGRAVITY) )
{
if (mo->momz == 0)
mo->momz = -GRAVITY*2;
else
mo->momz -= GRAVITY;
}
if (mo->z + mo->height > mo->ceilingz)
{ // hit the ceiling
if (mo->momz > 0)
mo->momz = 0;
mo->z = mo->ceilingz - mo->height;
if (mo->flags & MF_SKULLFLY)
{ // the skull slammed into something
mo->momz = -mo->momz;
}
}
}
//===========================================================================
//
// CheckMissileImpact
//
//===========================================================================
static void CheckMissileImpact(mobj_t *mobj)
{
int i;
if (!numspechit || !(mobj->flags & MF_MISSILE) || !mobj->target)
{
return;
}
if (!mobj->target->player)
{
return;
}
for (i = numspechit - 1; i >= 0; i--)
{
P_ShootSpecialLine(mobj->target, spechit[i]);
}
}
/*
===================
=
= P_TryMove
=
= Attempt to move to a new position, crossing special lines unless MF_TELEPORT
= is set
=
===================
*/
boolean P_TryMove (mobj_t *thing, fixed_t x, fixed_t y)
{
fixed_t oldx, oldy;
int side, oldside;
line_t *ld;
floatok = false;
if (!P_CheckPosition(thing, x, y))
{ // Solid wall or thing
CheckMissileImpact(thing);
return false;
}
if (!(thing->flags & MF_NOCLIP))
{
if (tmceilingz - tmfloorz < thing->height)
{ // Doesn't fit
CheckMissileImpact(thing);
return false;
}
floatok = true;
if (!(thing->flags & MF_TELEPORT)
&& tmceilingz - thing->z < thing->height
&& !(thing->flags2 & MF2_FLY))
{ // mobj must lower itself to fit
CheckMissileImpact(thing);
return false;
}
if (thing->flags2 & MF2_FLY)
{
if (thing->z + thing->height > tmceilingz)
{
thing->momz = -8*FRACUNIT;
return false;
}
else if (thing->z < tmfloorz && tmfloorz - tmdropoffz > 24*FRACUNIT)
{
thing->momz = 8*FRACUNIT;
return false;
}
}
if (!(thing->flags & MF_TELEPORT)
// The Minotaur floor fire (MT_MNTRFX2) can step up any amount
&& thing->type != MT_MNTRFX2
&& tmfloorz - thing->z > 24*FRACUNIT)
{ // Too big a step up
CheckMissileImpact(thing);
return false;
}
if ((thing->flags & MF_MISSILE) && tmfloorz > thing->z)
{
CheckMissileImpact(thing);
}
if (!(thing->flags & (MF_DROPOFF|MF_FLOAT))
&& tmfloorz - tmdropoffz > 24*FRACUNIT)
{ // Can't move over a dropoff
return false;
}
}
//
// the move is ok, so link the thing into its new position
//
P_UnsetThingPosition (thing);
oldx = thing->x;
oldy = thing->y;
thing->floorz = tmfloorz;
thing->ceilingz = tmceilingz;
thing->x = x;
thing->y = y;
P_SetThingPosition (thing);
if (thing->flags2 & MF2_FOOTCLIP && P_GetThingFloorType(thing) != FLOOR_SOLID)
{
thing->flags2 |= MF2_FEETARECLIPPED;
}
else if (thing->flags2 & MF2_FEETARECLIPPED)
{
thing->flags2 &= ~MF2_FEETARECLIPPED;
}
//
// if any special lines were hit, do the effect
//
if (! (thing->flags & (MF_TELEPORT|MF_NOCLIP)) )
{
while (numspechit--)
{
// see if the line was crossed
ld = spechit[numspechit];
side = P_PointOnLineSide (thing->x, thing->y, ld);
oldside = P_PointOnLineSide (oldx, oldy, ld);
if (side != oldside)
{
if (ld->special)
{
P_CrossSpecialLine (ld - lines, oldside, thing);
}
}
}
}
return true;
}
/*
==================
=
= P_ThingHeightClip
=
= Takes a valid thing and adjusts the thing->floorz, thing->ceilingz,
= anf possibly thing->z
=
= This is called for all nearby monsters whenever a sector changes height
=
= If the thing doesn't fit, the z will be set to the lowest value and
= false will be returned
==================
*/
static boolean P_ThingHeightClip (mobj_t *thing)
{
boolean onfloor;
onfloor = (thing->z == thing->floorz);
P_CheckPosition (thing, thing->x, thing->y);
// what about stranding a monster partially off an edge?
thing->floorz = tmfloorz;
thing->ceilingz = tmceilingz;
if (onfloor)
{ // walking monsters rise and fall with the floor
thing->z = thing->floorz;
}
else
{ // don't adjust a floating monster unless forced to
if (thing->z + thing->height > thing->ceilingz)
thing->z = thing->ceilingz - thing->height;
}
if (thing->ceilingz - thing->floorz < thing->height)
return false;
return true;
}
/*
==============================================================================
SLIDE MOVE
Allows the player to slide along any angled walls
==============================================================================
*/
static fixed_t bestslidefrac, secondslidefrac;
static line_t *bestslideline, *secondslideline;
static mobj_t *slidemo;
static fixed_t tmxmove, tmymove;
/*
==================
=
= P_HitSlideLine
=
= Adjusts the xmove / ymove so that the next move will slide along the wall
==================
*/
static void P_HitSlideLine (line_t *ld)
{
int side;
angle_t lineangle, moveangle, deltaangle;
fixed_t movelen, newlen;
if (ld->slopetype == ST_HORIZONTAL)
{
tmymove = 0;
return;
}
if (ld->slopetype == ST_VERTICAL)
{
tmxmove = 0;
return;
}
side = P_PointOnLineSide (slidemo->x, slidemo->y, ld);
lineangle = R_PointToAngle2 (0, 0, ld->dx, ld->dy);
if (side == 1)
lineangle += ANG180;
moveangle = R_PointToAngle2 (0, 0, tmxmove, tmymove);
deltaangle = moveangle - lineangle;
if (deltaangle > ANG180)
deltaangle += ANG180;
// I_Error ("SlideLine: ang>ANG180");
lineangle >>= ANGLETOFINESHIFT;
deltaangle >>= ANGLETOFINESHIFT;
movelen = P_AproxDistance (tmxmove, tmymove);
newlen = FixedMul (movelen, finecosine[deltaangle]);
tmxmove = FixedMul (newlen, finecosine[lineangle]);
tmymove = FixedMul (newlen, finesine[lineangle]);
}
/*
==============
=
= PTR_SlideTraverse
=
==============
*/
static boolean PTR_SlideTraverse (intercept_t *in)
{
line_t *li;
if (!in->isaline)
I_Error ("PTR_SlideTraverse: not a line?");
li = in->d.line;
if (! (li->flags & ML_TWOSIDED))
{
if (P_PointOnLineSide (slidemo->x, slidemo->y, li))
return true; // don't hit the back side
goto isblocking;
}
P_LineOpening (li); // set openrange, opentop, openbottom
if (openrange < slidemo->height)
goto isblocking; // doesn't fit
if (opentop - slidemo->z < slidemo->height)
goto isblocking; // mobj is too high
if (openbottom - slidemo->z > 24*FRACUNIT )
goto isblocking; // too big a step up
return true; // this line doesn't block movement
// the line does block movement, see if it is closer than best so far
isblocking:
if (in->frac < bestslidefrac)
{
secondslidefrac = bestslidefrac;
secondslideline = bestslideline;
bestslidefrac = in->frac;
bestslideline = li;
}
return false; // stop
}
/*
==================
=
= P_SlideMove
=
= The momx / momy move is bad, so try to slide along a wall
=
= Find the first line hit, move flush to it, and slide along it
=
= This is a kludgy mess.
==================
*/
void P_SlideMove (mobj_t *mo)
{
fixed_t leadx, leady;
fixed_t trailx, traily;
fixed_t newx, newy;
int hitcount;
slidemo = mo;
hitcount = 0;
retry:
if (++hitcount == 3)
goto stairstep; // don't loop forever
//
// trace along the three leading corners
//
if (mo->momx > 0)
{
leadx = mo->x + mo->radius;
trailx = mo->x - mo->radius;
}
else
{
leadx = mo->x - mo->radius;
trailx = mo->x + mo->radius;
}
if (mo->momy > 0)
{
leady = mo->y + mo->radius;
traily = mo->y - mo->radius;
}
else
{
leady = mo->y - mo->radius;
traily = mo->y + mo->radius;
}
bestslidefrac = FRACUNIT + 1;
P_PathTraverse(leadx, leady, leadx + mo->momx, leady + mo->momy,
PT_ADDLINES, PTR_SlideTraverse);
P_PathTraverse(trailx, leady, trailx + mo->momx, leady + mo->momy,
PT_ADDLINES, PTR_SlideTraverse);
P_PathTraverse(leadx, traily, leadx + mo->momx, traily + mo->momy,
PT_ADDLINES, PTR_SlideTraverse);
//
// move up to the wall
//
if (bestslidefrac == FRACUNIT + 1)
{ // the move must have hit the middle, so stairstep
stairstep:
if (!P_TryMove(mo, mo->x, mo->y + mo->momy))
{
P_TryMove(mo, mo->x + mo->momx, mo->y);
}
return;
}
bestslidefrac -= 0x800; // fudge a bit to make sure it doesn't hit
if (bestslidefrac > 0)
{
newx = FixedMul (mo->momx, bestslidefrac);
newy = FixedMul (mo->momy, bestslidefrac);
if (!P_TryMove (mo, mo->x + newx, mo->y + newy))
goto stairstep;
}
//
// now continue along the wall
//
bestslidefrac = FRACUNIT - (bestslidefrac + 0x800); // remainder
if (bestslidefrac > FRACUNIT)
bestslidefrac = FRACUNIT;
if (bestslidefrac <= 0)
return;
tmxmove = FixedMul (mo->momx, bestslidefrac);
tmymove = FixedMul (mo->momy, bestslidefrac);
P_HitSlideLine (bestslideline); // clip the moves
mo->momx = tmxmove;
mo->momy = tmymove;
if (!P_TryMove (mo, mo->x + tmxmove, mo->y + tmymove))
{
goto retry;
}
}
/*
==============================================================================
P_LineAttack
==============================================================================
*/
mobj_t *linetarget; /* who got hit (or NULL) */
fixed_t attackrange;
static fixed_t aimslope;
static int la_damage;
static mobj_t *shootthing;
static fixed_t shootz; /* height if not aiming up or down */
/* ???: use slope for monsters? */
/*
===============================================================================
=
= PTR_AimTraverse
=
= Sets linetaget and aimslope when a target is aimed at
===============================================================================
*/
static boolean PTR_AimTraverse (intercept_t *in)
{
line_t *li;
mobj_t *th;
fixed_t slope, thingtopslope, thingbottomslope;
fixed_t dist;
if (in->isaline)
{
li = in->d.line;
if (!(li->flags & ML_TWOSIDED))
return false; // stop
//
// crosses a two sided line
// a two sided line will restrict the possible target ranges
P_LineOpening (li);
if (openbottom >= opentop)
return false; // stop
dist = FixedMul (attackrange, in->frac);
if (li->frontsector->floorheight != li->backsector->floorheight)
{
slope = FixedDiv (openbottom - shootz , dist);
if (slope > bottomslope)
bottomslope = slope;
}
if (li->frontsector->ceilingheight != li->backsector->ceilingheight)
{
slope = FixedDiv (opentop - shootz, dist);
if (slope < topslope)
topslope = slope;
}
if (topslope <= bottomslope)
return false; // stop
return true; // shot continues
}
//
// shoot a thing
//
th = in->d.thing;
if (th == shootthing)
return true; // can't shoot self
if (!(th->flags & MF_SHOOTABLE))
{ // corpse or something
return true;
}
if (th->type == MT_POD)
{ // Can't auto-aim at pods
return true;
}
// check angles to see if the thing can be aimed at
dist = FixedMul (attackrange, in->frac);
thingtopslope = FixedDiv (th->z + th->height - shootz, dist);
if (thingtopslope < bottomslope)
return true; // shot over the thing
thingbottomslope = FixedDiv (th->z - shootz, dist);
if (thingbottomslope > topslope)
return true; // shot under the thing
//
// this thing can be hit!
//
if (thingtopslope > topslope)
thingtopslope = topslope;
if (thingbottomslope < bottomslope)
thingbottomslope = bottomslope;
aimslope = (thingtopslope + thingbottomslope) / 2;
linetarget = th;
return false; // don't go any farther
}
/*
==============================================================================
=
= PTR_ShootTraverse
=
==============================================================================
*/
static boolean PTR_ShootTraverse (intercept_t *in)
{
fixed_t x, y, z;
fixed_t frac;
line_t *li;
mobj_t *th;
fixed_t slope;
fixed_t dist;
fixed_t thingtopslope, thingbottomslope;
mobj_t *mo;
if (in->isaline)
{
li = in->d.line;
if (li->special)
P_ShootSpecialLine (shootthing, li);
if (!(li->flags & ML_TWOSIDED))
goto hitline;
//
// crosses a two sided line
//
P_LineOpening (li);
dist = FixedMul (attackrange, in->frac);
if (li->frontsector->floorheight != li->backsector->floorheight)
{
slope = FixedDiv (openbottom - shootz, dist);
if (slope > aimslope)
goto hitline;
}
if (li->frontsector->ceilingheight != li->backsector->ceilingheight)
{
slope = FixedDiv (opentop - shootz , dist);
if (slope < aimslope)
goto hitline;
}
return true; // shot continues
//
// hit line
//
hitline:
// position a bit closer
frac = in->frac - FixedDiv(4*FRACUNIT, attackrange);
x = trace.x + FixedMul(trace.dx, frac);
y = trace.y + FixedMul(trace.dy, frac);
z = shootz + FixedMul(aimslope, FixedMul(frac, attackrange));
if (li->frontsector->ceilingpic == skyflatnum)
{
if (z > li->frontsector->ceilingheight)
return false; // don't shoot the sky!
if (li->backsector && li->backsector->ceilingpic == skyflatnum)
return false; // it's a sky hack wall
}
P_SpawnPuff (x, y, z);
return false; // don't go any farther
}
//
// shoot a thing
//
th = in->d.thing;
if (th == shootthing)
return true; // can't shoot self
if (!(th->flags & MF_SHOOTABLE))
return true; // corpse or something
//
// check for physical attacks on a ghost
//
if (th->flags & MF_SHADOW && shootthing->player->readyweapon == wp_staff)
{
return true;
}
// check angles to see if the thing can be aimed at
dist = FixedMul (attackrange, in->frac);
thingtopslope = FixedDiv (th->z + th->height - shootz, dist);
if (thingtopslope < aimslope)
return true; // shot over the thing
thingbottomslope = FixedDiv (th->z - shootz, dist);
if (thingbottomslope > aimslope)
return true; // shot under the thing
//
// hit thing
//
// position a bit closer
frac = in->frac - FixedDiv(10*FRACUNIT, attackrange);
x = trace.x + FixedMul(trace.dx, frac);
y = trace.y + FixedMul(trace.dy, frac);
z = shootz + FixedMul(aimslope, FixedMul(frac, attackrange));
if (PuffType == MT_BLASTERPUFF1)
{ // Make blaster big puff
mo = P_SpawnMobj(x, y, z, MT_BLASTERPUFF2);
S_StartSound(mo, sfx_blshit);
}
else
{
P_SpawnPuff(x, y, z);
}
if (la_damage)
{
if (!(in->d.thing->flags & MF_NOBLOOD) && P_Random() < 192)
{
P_BloodSplatter(x, y, z, in->d.thing);
}
P_DamageMobj(th, shootthing, shootthing, la_damage);
}
return false; // don't go any farther
}
/*
=================
=
= P_AimLineAttack
=
=================
*/
fixed_t P_AimLineAttack (mobj_t *t1, angle_t angle, fixed_t distance)
{
fixed_t x2, y2;
angle >>= ANGLETOFINESHIFT;
shootthing = t1;
x2 = t1->x + (distance>>FRACBITS)*finecosine[angle];
y2 = t1->y + (distance>>FRACBITS)*finesine[angle];
shootz = t1->z + (t1->height>>1) + 8*FRACUNIT;
topslope = 100*FRACUNIT/160; // can't shoot outside view angles
bottomslope = -100*FRACUNIT/160;
attackrange = distance;
linetarget = NULL;
P_PathTraverse (t1->x, t1->y, x2, y2, PT_ADDLINES|PT_ADDTHINGS, PTR_AimTraverse);
if (linetarget)
return aimslope;
return 0;
}
/*
=================
=
= P_LineAttack
=
= if damage == 0, it is just a test trace that will leave linetarget set
=
=================
*/
void P_LineAttack (mobj_t *t1, angle_t angle, fixed_t distance, fixed_t slope, int damage)
{
fixed_t x2, y2;
angle >>= ANGLETOFINESHIFT;
shootthing = t1;
la_damage = damage;
x2 = t1->x + (distance>>FRACBITS)*finecosine[angle];
y2 = t1->y + (distance>>FRACBITS)*finesine[angle];
shootz = t1->z + (t1->height>>1) + 8*FRACUNIT;
if (t1->flags2 & MF2_FEETARECLIPPED)
{
shootz -= FOOTCLIPSIZE;
}
attackrange = distance;
aimslope = slope;
P_PathTraverse (t1->x, t1->y, x2, y2, PT_ADDLINES|PT_ADDTHINGS, PTR_ShootTraverse);
}
/*
==============================================================================
USE LINES
==============================================================================
*/
static mobj_t *usething;
static boolean PTR_UseTraverse (intercept_t *in)
{
if (!in->d.line->special)
{
P_LineOpening (in->d.line);
if (openrange <= 0)
{
//S_StartSound (usething, sfx_noway);
return false; // can't use through a wall
}
return true; // not a special line, but keep checking
}
if (P_PointOnLineSide (usething->x, usething->y, in->d.line) == 1)
return false; // don't use back sides
P_UseSpecialLine (usething, in->d.line);
return false; // can't use for than one special line in a row
}
/*
================
=
= P_UseLines
=
= Looks for special lines in front of the player to activate
================
*/
void P_UseLines (player_t *player)
{
int angle;
fixed_t x1, y1, x2, y2;
usething = player->mo;
angle = player->mo->angle >> ANGLETOFINESHIFT;
x1 = player->mo->x;
y1 = player->mo->y;
x2 = x1 + (USERANGE>>FRACBITS)*finecosine[angle];
y2 = y1 + (USERANGE>>FRACBITS)*finesine[angle];
P_PathTraverse (x1, y1, x2, y2, PT_ADDLINES, PTR_UseTraverse);
}
/*
==============================================================================
RADIUS ATTACK
==============================================================================
*/
static mobj_t *bombsource;
static mobj_t *bombspot;
static int bombdamage;
/*
=================
=
= PIT_RadiusAttack
=
= Source is the creature that casued the explosion at spot
=================
*/
static boolean PIT_RadiusAttack (mobj_t *thing)
{
fixed_t dx, dy, dist;
if (!(thing->flags & MF_SHOOTABLE))
{
return true;
}
if (thing->type == MT_MINOTAUR || thing->type == MT_SORCERER1
|| thing->type == MT_SORCERER2)
{ // Episode 2 and 3 bosses take no damage from PIT_RadiusAttack
return true;
}
dx = abs(thing->x - bombspot->x);
dy = abs(thing->y - bombspot->y);
dist = dx > dy ? dx : dy;
dist = (dist - thing->radius)>>FRACBITS;
if (dist < 0)
{
dist = 0;
}
if (dist >= bombdamage)
{ // Out of range
return true;
}
if (P_CheckSight(thing, bombspot))
{ // OK to damage, target is in direct path
P_DamageMobj(thing, bombspot, bombsource, bombdamage - dist);
}
return true;
}
/*
=================
=
= P_RadiusAttack
=
= Source is the creature that caused the explosion at spot
=================
*/
void P_RadiusAttack (mobj_t *spot, mobj_t *source, int damage)
{
int x, y, xl, xh, yl, yh;
fixed_t dist;
dist = (damage + MAXRADIUS)<<FRACBITS;
yh = (spot->y + dist-bmaporgy)>>MAPBLOCKSHIFT;
yl = (spot->y - dist-bmaporgy)>>MAPBLOCKSHIFT;
xh = (spot->x + dist-bmaporgx)>>MAPBLOCKSHIFT;
xl = (spot->x - dist-bmaporgx)>>MAPBLOCKSHIFT;
bombspot = spot;
if (spot->type == MT_POD && spot->target)
{
bombsource = spot->target;
}
else
{
bombsource = source;
}
bombdamage = damage;
for (y = yl; y <= yh; y++)
{
for (x = xl; x <= xh; x++)
{
P_BlockThingsIterator(x, y, PIT_RadiusAttack);
}
}
}
/*
==============================================================================
SECTOR HEIGHT CHANGING
= After modifying a sectors floor or ceiling height, call this
= routine to adjust the positions of all things that touch the
= sector.
=
= If anything doesn't fit anymore, true will be returned.
= If crunch is true, they will take damage as they are being crushed
= If Crunch is false, you should set the sector height back the way it
= was and call P_ChangeSector again to undo the changes
==============================================================================
*/
static boolean crushchange;
static boolean nofit;
/*
===============
=
= PIT_ChangeSector
=
===============
*/
static boolean PIT_ChangeSector (mobj_t *thing)
{
mobj_t *mo;
if (P_ThingHeightClip (thing))
return true; // keep checking
// crunch bodies to giblets
if (thing->health <= 0)
{
//P_SetMobjState (thing, S_GIBS);
thing->height = 0;
thing->radius = 0;
return true; // keep checking
}
// crunch dropped items
if (thing->flags & MF_DROPPED)
{
P_RemoveMobj (thing);
return true; // keep checking
}
if (!(thing->flags & MF_SHOOTABLE))
return true; // assume it is bloody gibs or something
nofit = true;
if (crushchange && !(leveltime & 3))
{
P_DamageMobj(thing, NULL, NULL, 10);
// spray blood in a random direction
mo = P_SpawnMobj (thing->x, thing->y, thing->z + thing->height/2, MT_BLOOD);
mo->momx = (P_Random() - P_Random ())<<12;
mo->momy = (P_Random() - P_Random ())<<12;
}
return true; // keep checking (crush other things)
}
/*
===============
=
= P_ChangeSector
=
===============
*/
boolean P_ChangeSector (sector_t *sector, boolean crunch)
{
int x, y;
nofit = false;
crushchange = crunch;
// recheck heights for all things near the moving sector
for (x = sector->blockbox[BOXLEFT]; x <= sector->blockbox[BOXRIGHT]; x++)
{
for (y = sector->blockbox[BOXBOTTOM]; y <= sector->blockbox[BOXTOP]; y++)
P_BlockThingsIterator (x, y, PIT_ChangeSector);
}
return nofit;
}