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p_maputl.cpp
2180 lines (1892 loc) · 56.3 KB
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p_maputl.cpp
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//-----------------------------------------------------------------------------
//
// Copyright 1993-1996 id Software
// Copyright 1994-1996 Raven Software
// Copyright 1998-1998 Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
// Copyright 1999-2016 Randy Heit
// Copyright 2002-2017 Christoph Oelckers
//
// 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 3 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, see http://www.gnu.org/licenses/
//
//-----------------------------------------------------------------------------
//
// DESCRIPTION:
// Movement/collision utility functions,
// as used by function in p_map.c.
// BLOCKMAP Iterator functions,
// and some PIT_* functions to use for iteration.
//
//-----------------------------------------------------------------------------
/* For code that originates from ZDoom the following applies:
**
**---------------------------------------------------------------------------
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#include <stdlib.h>
#include "m_bbox.h"
#include "doomdef.h"
#include "doomdata.h"
#include "doomstat.h"
#include "p_local.h"
#include "p_maputl.h"
#include "p_3dmidtex.h"
#include "p_blockmap.h"
#include "r_utility.h"
#include "actor.h"
#include "actorinlines.h"
// State.
#include "r_state.h"
#include "templates.h"
#include "po_man.h"
#include "g_levellocals.h"
#include "vm.h"
sector_t *P_PointInSectorBuggy(double x, double y);
int P_VanillaPointOnDivlineSide(double x, double y, const divline_t* line);
//==========================================================================
//
// P_AproxDistance
//
// Gives an estimation of distance (not exact)
//
//==========================================================================
int P_AproxDistance (int dx, int dy)
{
dx = abs(dx);
dy = abs(dy);
return (dx < dy) ? dx+dy-(dx>>1) : dx+dy-(dy>>1);
}
//==========================================================================
//
// P_InterceptVector
//
// Returns the fractional intercept point along the first divline.
//
//==========================================================================
double P_InterceptVector(const divline_t *v2, const divline_t *v1)
{
double num;
double den;
double v1x = v1->x;
double v1y = v1->y;
double v1dx = v1->dx;
double v1dy = v1->dy;
double v2x = v2->x;
double v2y = v2->y;
double v2dx = v2->dx;
double v2dy = v2->dy;
den = v1dy*v2dx - v1dx*v2dy;
if (den == 0)
return 0; // parallel
num = (v1x - v2x)*v1dy + (v2y - v1y)*v1dx;
return num / den;
}
//==========================================================================
//
// P_LineOpening
//
// Sets opentop and openbottom to the window
// through a two sided line.
//
//==========================================================================
void P_LineOpening (FLineOpening &open, AActor *actor, const line_t *linedef, const DVector2 &pos, const DVector2 *ref, int flags)
{
if (!(flags & FFCF_ONLY3DFLOORS))
{
sector_t *front, *back;
double fc = 0, ff = 0, bc = 0, bf = 0;
if (linedef->backsector == NULL)
{
// single sided line
open.range = 0;
return;
}
front = linedef->frontsector;
back = linedef->backsector;
if (!(flags & FFCF_NOPORTALS) && (linedef->flags & ML_PORTALCONNECT))
{
if (!linedef->frontsector->PortalBlocksMovement(sector_t::ceiling)) fc = LINEOPEN_MAX;
if (!linedef->backsector->PortalBlocksMovement(sector_t::ceiling)) bc = LINEOPEN_MAX;
if (!linedef->frontsector->PortalBlocksMovement(sector_t::floor)) ff = LINEOPEN_MIN;
if (!linedef->backsector->PortalBlocksMovement(sector_t::floor)) bf = LINEOPEN_MIN;
}
if (fc == 0) fc = front->ceilingplane.ZatPoint(pos);
if (bc == 0) bc = back->ceilingplane.ZatPoint(pos);
if (ff == 0) ff = front->floorplane.ZatPoint(pos);
if (bf == 0) bf = back->floorplane.ZatPoint(pos);
/*Printf ("]]]]]] %d %d\n", ff, bf);*/
open.topsec = fc < bc? front : back;
open.ceilingpic = open.topsec->GetTexture(sector_t::ceiling);
open.top = fc < bc ? fc : bc;
bool usefront;
// [RH] fudge a bit for actors that are moving across lines
// bordering a slope/non-slope that meet on the floor. Note
// that imprecisions in the plane equation mean there is a
// good chance that even if a slope and non-slope look like
// they line up, they won't be perfectly aligned.
if (ff == -FLT_MIN || bf == -FLT_MIN || ref == NULL || fabs (ff-bf) > 1./256)
{
usefront = (ff > bf);
}
else
{
if (!front->floorplane.isSlope())
usefront = true;
else if (!back->floorplane.isSlope())
usefront = false;
else
usefront = !P_PointOnLineSide (*ref, linedef);
}
if (usefront)
{
open.bottom = ff;
open.bottomsec = front;
open.floorpic = front->GetTexture(sector_t::floor);
open.floorterrain = front->GetTerrain(sector_t::floor);
if (bf != -FLT_MIN) open.lowfloor = bf;
else if (!(flags & FFCF_NODROPOFF))
{
// We must check through the portal for the actual dropoff.
// If there's no lines in the lower sections we'd never get a usable value otherwise.
open.lowfloor = back->NextLowestFloorAt(pos.X, pos.Y, back->GetPortalPlaneZ(sector_t::floor) - EQUAL_EPSILON);
}
}
else
{
open.bottom = bf;
open.bottomsec = back;
open.floorpic = back->GetTexture(sector_t::floor);
open.floorterrain = back->GetTerrain(sector_t::floor);
if (ff != -FLT_MIN) open.lowfloor = ff;
else if (!(flags & FFCF_NODROPOFF))
{
// We must check through the portal for the actual dropoff.
// If there's no lines in the lower sections we'd never get a usable value otherwise.
open.lowfloor = front->NextLowestFloorAt(pos.X, pos.Y, front->GetPortalPlaneZ(sector_t::floor) - EQUAL_EPSILON);
}
}
open.frontfloorplane = front->floorplane;
open.backfloorplane = back->floorplane;
}
else
{ // Dummy stuff to have some sort of opening for the 3D checks to modify
open.topsec = NULL;
open.ceilingpic.SetInvalid();
open.top = LINEOPEN_MAX;
open.bottomsec = NULL;
open.floorpic.SetInvalid();
open.floorterrain = -1;
open.bottom = LINEOPEN_MIN;
open.lowfloor = LINEOPEN_MAX;
open.frontfloorplane.SetAtHeight(LINEOPEN_MIN, sector_t::floor);
open.backfloorplane.SetAtHeight(LINEOPEN_MIN, sector_t::floor);
}
// Check 3D floors
if (actor != NULL)
{
P_LineOpening_XFloors(open, actor, linedef, pos.X, pos.Y, !!(flags & FFCF_3DRESTRICT));
}
if (actor != NULL && linedef->frontsector != NULL && linedef->backsector != NULL &&
linedef->flags & ML_3DMIDTEX)
{
open.touchmidtex = P_LineOpening_3dMidtex(actor, linedef, open, !!(flags & FFCF_3DRESTRICT));
}
else
{
open.abovemidtex = open.touchmidtex = false;
}
// avoid overflows in the opening.
open.range = clamp(open.top - open.bottom, LINEOPEN_MIN, LINEOPEN_MAX);
}
//
// THING POSITION SETTING
//
//==========================================================================
//
// P_UnsetThingPosition
// Unlinks a thing from block map and sectors.
// On each position change, BLOCKMAP and other
// lookups maintaining lists of things inside
// these structures need to be updated.
//
//==========================================================================
void AActor::UnlinkFromWorld (FLinkContext *ctx)
{
if (ctx != nullptr) ctx->sector_list = nullptr;
if (!(flags & MF_NOSECTOR))
{
// invisible things don't need to be in sector list
// unlink from subsector
// killough 8/11/98: simpler scheme using pointers-to-pointers for prev
// pointers, allows head node pointers to be treated like everything else
AActor **prev = sprev;
AActor *next = snext;
if (prev != NULL) // prev will be NULL if this actor gets deleted due to cleaning up from a broken savegame
{
if ((*prev = next)) // unlink from sector list
next->sprev = prev;
snext = NULL;
sprev = (AActor **)(size_t)0xBeefCafe; // Woo! Bug-catching value!
// phares 3/14/98
//
// Save the sector list pointed to by touching_sectorlist.
// In P_SetThingPosition, we'll keep any nodes that represent
// sectors the Thing still touches. We'll add new ones then, and
// delete any nodes for sectors the Thing has vacated. Then we'll
// put it back into touching_sectorlist. It's done this way to
// avoid a lot of deleting/creating for nodes, when most of the
// time you just get back what you deleted anyway.
if (ctx != nullptr)
{
ctx->sector_list = touching_sectorlist;
ctx->render_list = touching_rendersectors;
}
else
{
P_DelSeclist(touching_sectorlist, §or_t::touching_thinglist);
P_DelSeclist(touching_rendersectors, §or_t::touching_renderthings);
}
touching_sectorlist = nullptr; //to be restored by P_SetThingPosition
touching_rendersectors = nullptr;
}
}
if (!(flags & MF_NOBLOCKMAP))
{
// [RH] Unlink from all blocks this actor uses
FBlockNode *block = this->BlockNode;
while (block != NULL)
{
if (block->NextActor != NULL)
{
block->NextActor->PrevActor = block->PrevActor;
}
*(block->PrevActor) = block->NextActor;
FBlockNode *next = block->NextBlock;
block->Release ();
block = next;
}
BlockNode = NULL;
}
}
//==========================================================================
//
// If the thing is exactly on a line, move it into the sector
// slightly in order to resolve clipping issues in the renderer.
//
//==========================================================================
bool AActor::FixMapthingPos()
{
sector_t *secstart = P_PointInSectorBuggy(X(), Y());
int blockx = level.blockmap.GetBlockX(X());
int blocky = level.blockmap.GetBlockY(Y());
bool success = false;
if (level.blockmap.isValidBlock(blockx, blocky))
{
int *list;
for (list = level.blockmap.GetLines(blockx, blocky); *list != -1; ++list)
{
line_t *ldef = &level.lines[*list];
if (ldef->frontsector == ldef->backsector)
{ // Skip two-sided lines inside a single sector
continue;
}
if (ldef->backsector != NULL)
{
if (ldef->frontsector->floorplane == ldef->backsector->floorplane &&
ldef->frontsector->ceilingplane == ldef->backsector->ceilingplane)
{ // Skip two-sided lines without any height difference on either side
continue;
}
}
// Not inside the line's bounding box
if (X() + radius <= ldef->bbox[BOXLEFT]
|| X() - radius >= ldef->bbox[BOXRIGHT]
|| Y() + radius <= ldef->bbox[BOXBOTTOM]
|| Y() - radius >= ldef->bbox[BOXTOP])
continue;
// Get the exact distance to the line
divline_t dll, dlv;
double linelen = ldef->Delta().Length();
P_MakeDivline(ldef, &dll);
dlv.x = X();
dlv.y = Y();
dlv.dx = dll.dy / linelen;
dlv.dy = -dll.dx / linelen;
double distance = fabs(P_InterceptVector(&dlv, &dll));
if (distance < radius)
{
DPrintf(DMSG_NOTIFY, "%s at (%f,%f) lies on %s line %d, distance = %f\n",
this->GetClass()->TypeName.GetChars(), X(), Y(),
ldef->Delta().X == 0 ? "vertical" : ldef->Delta().Y == 0 ? "horizontal" : "diagonal",
ldef->Index(), distance);
DAngle ang = ldef->Delta().Angle();
if (ldef->backsector != NULL && ldef->backsector == secstart)
{
ang += 90.;
}
else
{
ang -= 90.;
}
// Get the distance we have to move the object away from the wall
distance = radius - distance;
SetXY(Pos().XY() + ang.ToVector(distance));
ClearInterpolation();
success = true;
}
}
}
return success;
}
DEFINE_ACTION_FUNCTION(AActor, UnlinkFromWorld)
{
PARAM_SELF_PROLOGUE(AActor);
PARAM_POINTER_DEF(ctx, FLinkContext);
self->UnlinkFromWorld(ctx); // fixme
return 0;
}
//==========================================================================
//
// P_SetThingPosition
// Links a thing into both a block and a subsector based on its x y.
// Sets thing->sector properly
//
//==========================================================================
void AActor::LinkToWorld(FLinkContext *ctx, bool spawningmapthing, sector_t *sector)
{
bool spawning = spawningmapthing;
if (spawning)
{
if ((flags4 & MF4_FIXMAPTHINGPOS) && sector == NULL)
{
if (FixMapthingPos()) spawning = false;
}
}
if (sector == NULL)
{
if (!spawning)
{
sector = P_PointInSector(Pos());
}
else
{
sector = P_PointInSectorBuggy(X(), Y());
}
}
Sector = sector;
subsector = R_PointInSubsector(Pos()); // this is from the rendering nodes, not the gameplay nodes!
if (!(flags & MF_NOSECTOR))
{
// invisible things don't go into the sector links
// killough 8/11/98: simpler scheme using pointer-to-pointer prev
// pointers, allows head nodes to be treated like everything else
AActor **link = §or->thinglist;
AActor *next = *link;
if ((snext = next))
next->sprev = &snext;
sprev = link;
*link = this;
// phares 3/16/98
//
// If sector_list isn't NULL, it has a collection of sector
// nodes that were just removed from this Thing.
// Collect the sectors the object will live in by looking at
// the existing sector_list and adding new nodes and deleting
// obsolete ones.
// When a node is deleted, its sector links (the links starting
// at sector_t->touching_thinglist) are broken. When a node is
// added, new sector links are created.
touching_sectorlist = P_CreateSecNodeList(this, radius, ctx != nullptr? ctx->sector_list : nullptr, §or_t::touching_thinglist); // Attach to thing
if (renderradius >= 0) touching_rendersectors = P_CreateSecNodeList(this, MAX(radius, renderradius), ctx != nullptr ? ctx->render_list : nullptr, §or_t::touching_renderthings);
else
{
touching_rendersectors = nullptr;
if (ctx != nullptr) P_DelSeclist(ctx->render_list, §or_t::touching_renderthings);
}
}
// link into blockmap (inert things don't need to be in the blockmap)
if (!(flags & MF_NOBLOCKMAP))
{
FPortalGroupArray check;
P_CollectConnectedGroups(Sector->PortalGroup, Pos(), Top(), radius, check);
BlockNode = NULL;
FBlockNode **alink = &this->BlockNode;
for (int i = -1; i < (int)check.Size(); i++)
{
DVector3 pos = i==-1? Pos() : PosRelative(check[i] & ~FPortalGroupArray::FLAT);
int x1 = level.blockmap.GetBlockX(pos.X - radius);
int x2 = level.blockmap.GetBlockX(pos.X + radius);
int y1 = level.blockmap.GetBlockY(pos.Y - radius);
int y2 = level.blockmap.GetBlockY(pos.Y + radius);
if (x1 >= level.blockmap.bmapwidth || x2 < 0 || y1 >= level.blockmap.bmapheight || y2 < 0)
{ // thing is off the map
}
else
{ // [RH] Link into every block this actor touches, not just the center one
x1 = MAX(0, x1);
y1 = MAX(0, y1);
x2 = MIN(level.blockmap.bmapwidth - 1, x2);
y2 = MIN(level.blockmap.bmapheight - 1, y2);
for (int y = y1; y <= y2; ++y)
{
for (int x = x1; x <= x2; ++x)
{
FBlockNode **link = &level.blockmap.blocklinks[y*level.blockmap.bmapwidth + x];
FBlockNode *node = FBlockNode::Create(this, x, y, this->Sector->PortalGroup);
// Link in to block
if ((node->NextActor = *link) != NULL)
{
(*link)->PrevActor = &node->NextActor;
}
node->PrevActor = link;
*link = node;
// Link in to actor
node->PrevBlock = alink;
node->NextBlock = NULL;
(*alink) = node;
alink = &node->NextBlock;
}
}
}
}
}
// Portal links cannot be done unless the level is fully initialized.
if (!spawningmapthing) UpdateRenderSectorList();
}
DEFINE_ACTION_FUNCTION(AActor, LinkToWorld)
{
PARAM_SELF_PROLOGUE(AActor);
PARAM_POINTER_DEF(ctx, FLinkContext);
self->LinkToWorld(ctx);
return 0;
}
void AActor::SetOrigin(double x, double y, double z, bool moving)
{
FLinkContext ctx;
UnlinkFromWorld (&ctx);
SetXYZ(x, y, z);
LinkToWorld (&ctx);
P_FindFloorCeiling(this, FFCF_ONLYSPAWNPOS);
if (!moving) ClearInterpolation();
}
DEFINE_ACTION_FUNCTION(AActor, SetOrigin)
{
PARAM_SELF_PROLOGUE(AActor);
PARAM_FLOAT(x);
PARAM_FLOAT(y);
PARAM_FLOAT(z);
PARAM_BOOL(moving);
self->SetOrigin(x, y, z, moving);
return 0;
}
//===========================================================================
//
// FBlockNode - allows to link actors into multiple blocks in the blockmap
//
//===========================================================================
FBlockNode *FBlockNode::FreeBlocks = NULL;
FBlockNode *FBlockNode::Create (AActor *who, int x, int y, int group)
{
FBlockNode *block;
if (FreeBlocks != NULL)
{
block = FreeBlocks;
FreeBlocks = block->NextBlock;
}
else
{
block = new FBlockNode;
}
block->BlockIndex = x + y*level.blockmap.bmapwidth;
block->Me = who;
block->NextActor = NULL;
block->PrevActor = NULL;
block->PrevBlock = NULL;
block->NextBlock = NULL;
return block;
}
void FBlockNode::Release ()
{
NextBlock = FreeBlocks;
FreeBlocks = this;
}
//
// BLOCK MAP ITERATORS
// For each line/thing in the given mapblock,
// call the passed PIT_* function.
// If the function returns false,
// exit with false without checking anything else.
//
//===========================================================================
//
// FBlockLinesIterator
//
//===========================================================================
extern polyblock_t **PolyBlockMap;
FBlockLinesIterator::FBlockLinesIterator(int _minx, int _miny, int _maxx, int _maxy, bool keepvalidcount)
{
if (!keepvalidcount) validcount++;
minx = _minx;
maxx = _maxx;
miny = _miny;
maxy = _maxy;
Reset();
}
void FBlockLinesIterator::init(const FBoundingBox &box)
{
validcount++;
maxy = level.blockmap.GetBlockY(box.Top());
miny = level.blockmap.GetBlockY(box.Bottom());
maxx = level.blockmap.GetBlockX(box.Right());
minx = level.blockmap.GetBlockX(box.Left());
Reset();
}
FBlockLinesIterator::FBlockLinesIterator(const FBoundingBox &box)
{
init(box);
}
//===========================================================================
//
// FBlockLinesIterator :: StartBlock
//
//===========================================================================
void FBlockLinesIterator::StartBlock(int x, int y)
{
curx = x;
cury = y;
if (level.blockmap.isValidBlock(x, y))
{
int offset = y*level.blockmap.bmapwidth + x;
polyLink = PolyBlockMap? PolyBlockMap[offset] : NULL;
polyIndex = 0;
list = level.blockmap.GetLines(x, y);
}
else
{
// invalid block
list = NULL;
polyLink = NULL;
}
}
//===========================================================================
//
// FBlockLinesIterator :: Next
//
//===========================================================================
line_t *FBlockLinesIterator::Next()
{
while (true)
{
while (polyLink != NULL)
{
if (polyLink->polyobj)
{
if (polyIndex == 0)
{
if (polyLink->polyobj->validcount == validcount)
{
polyLink = polyLink->next;
continue;
}
polyLink->polyobj->validcount = validcount;
}
line_t *ld = polyLink->polyobj->Linedefs[polyIndex];
if (++polyIndex >= (int)polyLink->polyobj->Linedefs.Size())
{
polyLink = polyLink->next;
polyIndex = 0;
}
if (ld->validcount == validcount)
{
continue;
}
else
{
ld->validcount = validcount;
return ld;
}
}
else polyLink = polyLink->next;
}
if (list != NULL)
{
while (*list != -1)
{
line_t *ld = &level.lines[*list];
list++;
if (ld->validcount != validcount)
{
ld->validcount = validcount;
return ld;
}
}
}
if (++curx > maxx)
{
curx = minx;
if (++cury > maxy) return NULL;
}
StartBlock(curx, cury);
}
}
//===========================================================================
//
// FMultiBlockLinesIterator :: FMultiBlockLinesIterator
//
// An iterator that can check multiple portal groups.
//
//===========================================================================
FMultiBlockLinesIterator::FMultiBlockLinesIterator(FPortalGroupArray &check, AActor *origin, double checkradius)
: checklist(check)
{
checkpoint = origin->Pos();
if (!check.inited) P_CollectConnectedGroups(origin->Sector->PortalGroup, checkpoint, origin->Top(), checkradius, checklist);
checkpoint.Z = checkradius == -1? origin->radius : checkradius;
basegroup = origin->Sector->PortalGroup;
startsector = origin->Sector;
Reset();
}
FMultiBlockLinesIterator::FMultiBlockLinesIterator(FPortalGroupArray &check, double checkx, double checky, double checkz, double checkh, double checkradius, sector_t *newsec)
: checklist(check)
{
checkpoint = { checkx, checky, checkz };
if (newsec == NULL) newsec = P_PointInSector(checkx, checky);
startsector = newsec;
basegroup = newsec->PortalGroup;
if (!check.inited) P_CollectConnectedGroups(basegroup, checkpoint, checkz + checkh, checkradius, checklist);
checkpoint.Z = checkradius;
Reset();
}
//===========================================================================
//
// Go up a ceiling portal
//
//===========================================================================
bool FMultiBlockLinesIterator::GoUp(double x, double y)
{
if (continueup)
{
if (!cursector->PortalBlocksMovement(sector_t::ceiling))
{
startIteratorForGroup(cursector->GetOppositePortalGroup(sector_t::ceiling));
portalflags = FFCF_NOFLOOR;
return true;
}
else continueup = false;
}
return false;
}
//===========================================================================
//
// Go down a floor portal
//
//===========================================================================
bool FMultiBlockLinesIterator::GoDown(double x, double y)
{
if (continuedown)
{
if (!cursector->PortalBlocksMovement(sector_t::floor))
{
startIteratorForGroup(cursector->GetOppositePortalGroup(sector_t::floor));
portalflags = FFCF_NOCEILING;
return true;
}
else continuedown = false;
}
return false;
}
//===========================================================================
//
// Gets the next line - also manages switching between portal groups
//
//===========================================================================
bool FMultiBlockLinesIterator::Next(FMultiBlockLinesIterator::CheckResult *item)
{
line_t *line = blockIterator.Next();
if (line != NULL)
{
item->line = line;
item->Position.X = offset.X;
item->Position.Y = offset.Y;
item->portalflags = portalflags;
return true;
}
bool onlast = unsigned(index + 1) >= checklist.Size();
int nextflags = onlast ? 0 : checklist[index + 1] & FPortalGroupArray::FLAT;
if (portalflags == FFCF_NOFLOOR && nextflags != FPortalGroupArray::UPPER)
{
// if this is the last upper portal in the list, check if we need to go further up to find the real ceiling.
if (GoUp(offset.X, offset.Y)) return Next(item);
}
else if (portalflags == FFCF_NOCEILING && nextflags != FPortalGroupArray::LOWER)
{
// if this is the last lower portal in the list, check if we need to go further down to find the real floor.
if (GoDown(offset.X, offset.Y)) return Next(item);
}
if (onlast)
{
cursector = startsector;
// We reached the end of the list. Check if we still need to check up- and downwards.
if (GoUp(checkpoint.X, checkpoint.Y) ||
GoDown(checkpoint.X, checkpoint.Y))
{
return Next(item);
}
return false;
}
index++;
startIteratorForGroup(checklist[index] & ~FPortalGroupArray::FLAT);
switch (nextflags)
{
case FPortalGroupArray::UPPER:
portalflags = FFCF_NOFLOOR;
break;
case FPortalGroupArray::LOWER:
portalflags = FFCF_NOCEILING;
break;
default:
portalflags = 0;
}
return Next(item);
}
//===========================================================================
//
// start iterating a new group
//
//===========================================================================
void FMultiBlockLinesIterator::startIteratorForGroup(int group)
{
offset = Displacements.getOffset(basegroup, group);
offset.X += checkpoint.X;
offset.Y += checkpoint.Y;
cursector = group == startsector->PortalGroup ? startsector : P_PointInSector(offset);
bbox.setBox(offset.X, offset.Y, checkpoint.Z);
blockIterator.init(bbox);
}
//===========================================================================
//
// Resets the iterator
//
//===========================================================================
void FMultiBlockLinesIterator::Reset()
{
continueup = continuedown = true;
index = -1;
portalflags = 0;
startIteratorForGroup(basegroup);
}
//===========================================================================
//
// and the scriptable version
//
//===========================================================================
class DBlockLinesIterator : public DObject, public FMultiBlockLinesIterator
{
DECLARE_ABSTRACT_CLASS(DBlockLinesIterator, DObject);
FPortalGroupArray check;
public:
FMultiBlockLinesIterator::CheckResult cres;
bool Next()
{
return FMultiBlockLinesIterator::Next(&cres);
}
DBlockLinesIterator(AActor *actor, double checkradius)
: FMultiBlockLinesIterator(check, actor, checkradius)
{
cres.line = nullptr;
cres.Position.Zero();
cres.portalflags = 0;
}
DBlockLinesIterator(double x, double y, double z, double height, double radius, sector_t *sec)
:FMultiBlockLinesIterator(check, x, y, z, height, radius, sec)
{
cres.line = nullptr;
cres.Position.Zero();
cres.portalflags = 0;
}
};
IMPLEMENT_CLASS(DBlockLinesIterator, true, false);
DEFINE_ACTION_FUNCTION(DBlockLinesIterator, Create)
{
PARAM_PROLOGUE;
PARAM_OBJECT_NOT_NULL(origin, AActor);
PARAM_FLOAT_DEF(radius);
ACTION_RETURN_OBJECT(Create<DBlockLinesIterator>(origin, radius));
}
DEFINE_ACTION_FUNCTION(DBlockLinesIterator, CreateFromPos)
{
PARAM_PROLOGUE;
PARAM_FLOAT(x);
PARAM_FLOAT(y);
PARAM_FLOAT(z);
PARAM_FLOAT(h);
PARAM_FLOAT(radius);
PARAM_POINTER_DEF(sec, sector_t);
ACTION_RETURN_OBJECT(Create<DBlockLinesIterator>(x, y, z, h, radius, sec));
}
DEFINE_ACTION_FUNCTION(DBlockLinesIterator, Next)
{
PARAM_SELF_PROLOGUE(DBlockLinesIterator);
ACTION_RETURN_BOOL(self->Next());
}
DEFINE_FIELD_NAMED(DBlockLinesIterator, cres.line, curline);
DEFINE_FIELD_NAMED(DBlockLinesIterator, cres.Position, position);
DEFINE_FIELD_NAMED(DBlockLinesIterator, cres.portalflags, portalflags);
//===========================================================================