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P_MAP.C
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// P_map.c
#include <stdlib.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.
===============================================================================
*/
fixed_t tmbbox[4];
mobj_t *tmthing;
int tmflags;
fixed_t tmx, tmy;
boolean floatok; // if true, move would be ok if
// within tmfloorz - tmceilingz
fixed_t tmfloorz, tmceilingz, tmdropoffz;
// keep track of the line that lowers the ceiling, so missiles don't explode
// against sky hack walls
line_t *ceilingline;
// keep track of special lines as they are hit, but don't process them
// until the move is proven valid
#define MAXSPECIALCROSS 8
line_t *spechit[MAXSPECIALCROSS];
int numspechit;
mobj_t *onmobj; //generic global onmobj...used for landing on pods/players
/*
===============================================================================
TELEPORT MOVE
===============================================================================
*/
/*
==================
=
= PIT_StompThing
=
==================
*/
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
==================
*/
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
//
//---------------------------------------------------------------------------
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
//
//---------------------------------------------------------------------------
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
//
//==========================================================================
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
==================
*/
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
==============================================================================
*/
fixed_t bestslidefrac, secondslidefrac;
line_t *bestslideline, *secondslideline;
mobj_t *slidemo;
fixed_t tmxmove, tmymove;
/*
==================
=
= P_HitSlideLine
=
= Adjusts the xmove / ymove so that the next move will slide along the wall
==================
*/
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
=
==============
*/
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
}
/*
==================