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https://github.com/ZDoom/qzdoom-gpl.git
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f482dc094d
When this function was originally written there was no possibility of fractional vertex coordinates so it threw away the fractional parts of the node's directional vector (which in the original nodes was always 0.) Now, with UDMF and high precision vertices this no longer works and the loss of significant parts of their value caused this code to produce erroneous results if the linedefs were only a few map units long and using fractional positions.
1525 lines
38 KiB
C++
1525 lines
38 KiB
C++
// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// $Id:$
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//
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// Copyright (C) 1993-1996 by id Software, Inc.
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//
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// This source is available for distribution and/or modification
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// only under the terms of the DOOM Source Code License as
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// published by id Software. All rights reserved.
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//
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// The source is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
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// for more details.
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//
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// $Log:$
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//
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// DESCRIPTION:
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// Movement/collision utility functions,
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// as used by function in p_map.c.
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// BLOCKMAP Iterator functions,
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// and some PIT_* functions to use for iteration.
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//
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//-----------------------------------------------------------------------------
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#include <stdlib.h>
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#include "m_bbox.h"
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#include "doomdef.h"
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#include "doomstat.h"
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#include "p_local.h"
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#include "p_3dmidtex.h"
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// State.
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#include "r_state.h"
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#include "templates.h"
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#include "po_man.h"
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static AActor *RoughBlockCheck (AActor *mo, int index, void *);
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//==========================================================================
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//
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// P_AproxDistance
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//
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// Gives an estimation of distance (not exact)
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//
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//==========================================================================
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fixed_t P_AproxDistance (fixed_t dx, fixed_t dy)
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{
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dx = abs(dx);
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dy = abs(dy);
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return (dx < dy) ? dx+dy-(dx>>1) : dx+dy-(dy>>1);
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}
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//==========================================================================
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//
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// P_InterceptVector
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//
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// Returns the fractional intercept point along the first divline.
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//
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//==========================================================================
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fixed_t P_InterceptVector (const divline_t *v2, const divline_t *v1)
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{
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#if 0 // [RH] Use 64 bit ints, so long divlines don't overflow
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SQWORD den = ( ((SQWORD)v1->dy*v2->dx - (SQWORD)v1->dx*v2->dy) >> FRACBITS );
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if (den == 0)
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return 0; // parallel
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SQWORD num = ((SQWORD)(v1->x - v2->x)*v1->dy + (SQWORD)(v2->y - v1->y)*v1->dx);
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return (fixed_t)(num / den);
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#elif 0 // This is the original Doom version
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fixed_t frac;
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fixed_t num;
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fixed_t den;
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den = FixedMul (v1->dy>>8,v2->dx) - FixedMul(v1->dx>>8,v2->dy);
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if (den == 0)
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return 0;
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// I_Error ("P_InterceptVector: parallel");
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num =
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FixedMul ( (v1->x - v2->x)>>8 ,v1->dy )
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+FixedMul ( (v2->y - v1->y)>>8, v1->dx );
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frac = FixedDiv (num , den);
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return frac;
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#else // optimized version of the float debug version. A lot faster on modern systens.
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double frac;
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double num;
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double den;
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// There's no need to divide by FRACUNIT here.
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// At the end both num and den will contain a factor
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// 1/(FRACUNIT*FRACUNIT) so they'll cancel each other out.
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double v1x = (double)v1->x;
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double v1y = (double)v1->y;
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double v1dx = (double)v1->dx;
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double v1dy = (double)v1->dy;
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double v2x = (double)v2->x;
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double v2y = (double)v2->y;
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double v2dx = (double)v2->dx;
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double v2dy = (double)v2->dy;
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den = v1dy*v2dx - v1dx*v2dy;
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if (den == 0)
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return 0; // parallel
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num = (v1x - v2x)*v1dy + (v2y - v1y)*v1dx;
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frac = num / den;
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return FLOAT2FIXED(frac);
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#endif
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}
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//==========================================================================
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//
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// P_LineOpening
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//
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// Sets opentop and openbottom to the window
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// through a two sided line.
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//
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//==========================================================================
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void P_LineOpening (FLineOpening &open, AActor *actor, const line_t *linedef,
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fixed_t x, fixed_t y, fixed_t refx, fixed_t refy, int flags)
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{
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if (!(flags & FFCF_ONLY3DFLOORS))
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{
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sector_t *front, *back;
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fixed_t fc, ff, bc, bf;
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if (linedef->sidedef[1] == NULL)
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{
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// single sided line
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open.range = 0;
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return;
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}
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front = linedef->frontsector;
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back = linedef->backsector;
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fc = front->ceilingplane.ZatPoint (x, y);
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ff = front->floorplane.ZatPoint (x, y);
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bc = back->ceilingplane.ZatPoint (x, y);
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bf = back->floorplane.ZatPoint (x, y);
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/*Printf ("]]]]]] %d %d\n", ff, bf);*/
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open.topsec = fc < bc? front : back;
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open.ceilingpic = open.topsec->GetTexture(sector_t::ceiling);
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open.top = fc < bc ? fc : bc;
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bool usefront;
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// [RH] fudge a bit for actors that are moving across lines
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// bordering a slope/non-slope that meet on the floor. Note
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// that imprecisions in the plane equation mean there is a
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// good chance that even if a slope and non-slope look like
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// they line up, they won't be perfectly aligned.
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if (refx == FIXED_MIN ||
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abs (ff-bf) > 256)
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{
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usefront = (ff > bf);
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}
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else
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{
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if ((front->floorplane.a | front->floorplane.b) == 0)
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usefront = true;
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else if ((back->floorplane.a | front->floorplane.b) == 0)
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usefront = false;
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else
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usefront = !P_PointOnLineSide (refx, refy, linedef);
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}
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if (usefront)
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{
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open.bottom = ff;
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open.bottomsec = front;
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open.floorpic = front->GetTexture(sector_t::floor);
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open.lowfloor = bf;
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}
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else
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{
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open.bottom = bf;
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open.bottomsec = back;
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open.floorpic = back->GetTexture(sector_t::floor);
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open.lowfloor = ff;
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}
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}
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else
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{ // Dummy stuff to have some sort of opening for the 3D checks to modify
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open.topsec = NULL;
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open.ceilingpic.SetInvalid();
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open.top = FIXED_MAX;
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open.bottomsec = NULL;
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open.floorpic.SetInvalid();
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open.bottom = FIXED_MIN;
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open.lowfloor = FIXED_MAX;
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}
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// Check 3D floors
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if (actor != NULL)
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{
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P_LineOpening_XFloors(open, actor, linedef, x, y, refx, refy, !!(flags & FFCF_3DRESTRICT));
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}
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if (actor != NULL && linedef->frontsector != NULL && linedef->backsector != NULL &&
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linedef->flags & ML_3DMIDTEX)
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{
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open.touchmidtex = P_LineOpening_3dMidtex(actor, linedef, open, !!(flags & FFCF_3DRESTRICT));
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}
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else
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{
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open.abovemidtex = open.touchmidtex = false;
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}
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open.range = open.top - open.bottom;
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}
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//
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// THING POSITION SETTING
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//
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//==========================================================================
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//
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// P_UnsetThingPosition
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// Unlinks a thing from block map and sectors.
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// On each position change, BLOCKMAP and other
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// lookups maintaining lists of things inside
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// these structures need to be updated.
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//
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//==========================================================================
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void AActor::UnlinkFromWorld ()
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{
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sector_list = NULL;
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if (!(flags & MF_NOSECTOR))
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{
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// invisible things don't need to be in sector list
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// unlink from subsector
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// killough 8/11/98: simpler scheme using pointers-to-pointers for prev
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// pointers, allows head node pointers to be treated like everything else
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AActor **prev = sprev;
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AActor *next = snext;
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if (prev != NULL) // prev will be NULL if this actor gets deleted due to cleaning up from a broken savegame
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{
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if ((*prev = next)) // unlink from sector list
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next->sprev = prev;
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snext = NULL;
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sprev = (AActor **)(size_t)0xBeefCafe; // Woo! Bug-catching value!
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// phares 3/14/98
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//
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// Save the sector list pointed to by touching_sectorlist.
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// In P_SetThingPosition, we'll keep any nodes that represent
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// sectors the Thing still touches. We'll add new ones then, and
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// delete any nodes for sectors the Thing has vacated. Then we'll
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// put it back into touching_sectorlist. It's done this way to
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// avoid a lot of deleting/creating for nodes, when most of the
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// time you just get back what you deleted anyway.
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//
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// If this Thing is being removed entirely, then the calling
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// routine will clear out the nodes in sector_list.
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sector_list = touching_sectorlist;
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touching_sectorlist = NULL; //to be restored by P_SetThingPosition
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}
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}
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if (!(flags & MF_NOBLOCKMAP))
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{
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// [RH] Unlink from all blocks this actor uses
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FBlockNode *block = this->BlockNode;
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while (block != NULL)
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{
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if (block->NextActor != NULL)
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{
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block->NextActor->PrevActor = block->PrevActor;
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}
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*(block->PrevActor) = block->NextActor;
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FBlockNode *next = block->NextBlock;
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block->Release ();
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block = next;
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}
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BlockNode = NULL;
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}
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}
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//==========================================================================
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//
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// P_SetThingPosition
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// Links a thing into both a block and a subsector based on it's x y.
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// Sets thing->sector properly
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//
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//==========================================================================
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void AActor::LinkToWorld (bool buggy)
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{
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// link into subsector
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sector_t *sec;
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if (!buggy || numgamenodes == 0)
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{
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sec = P_PointInSector (x, y);
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}
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else
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{
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sec = LinkToWorldForMapThing ();
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}
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LinkToWorld (sec);
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}
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void AActor::LinkToWorld (sector_t *sec)
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{
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if (sec == NULL)
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{
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LinkToWorld ();
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return;
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}
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Sector = sec;
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subsector = R_PointInSubsector(x, y); // this is from the rendering nodes, not the gameplay nodes!
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if ( !(flags & MF_NOSECTOR) )
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{
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// invisible things don't go into the sector links
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// killough 8/11/98: simpler scheme using pointer-to-pointer prev
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// pointers, allows head nodes to be treated like everything else
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AActor **link = &sec->thinglist;
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AActor *next = *link;
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if ((snext = next))
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next->sprev = &snext;
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sprev = link;
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*link = this;
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// phares 3/16/98
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//
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// If sector_list isn't NULL, it has a collection of sector
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// nodes that were just removed from this Thing.
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// Collect the sectors the object will live in by looking at
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// the existing sector_list and adding new nodes and deleting
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// obsolete ones.
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// When a node is deleted, its sector links (the links starting
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// at sector_t->touching_thinglist) are broken. When a node is
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// added, new sector links are created.
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P_CreateSecNodeList (this, x, y);
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touching_sectorlist = sector_list; // Attach to thing
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sector_list = NULL; // clear for next time
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}
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// link into blockmap (inert things don't need to be in the blockmap)
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if ( !(flags & MF_NOBLOCKMAP) )
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{
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int x1 = GetSafeBlockX(x - radius - bmaporgx);
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int x2 = GetSafeBlockX(x + radius - bmaporgx);
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int y1 = GetSafeBlockY(y - radius - bmaporgy);
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int y2 = GetSafeBlockY(y + radius - bmaporgy);
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if (x1 >= bmapwidth || x2 < 0 || y1 >= bmapheight || y2 < 0)
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{ // thing is off the map
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BlockNode = NULL;
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}
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else
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{ // [RH] Link into every block this actor touches, not just the center one
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FBlockNode **alink = &this->BlockNode;
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x1 = MAX (0, x1);
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y1 = MAX (0, y1);
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x2 = MIN (bmapwidth - 1, x2);
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y2 = MIN (bmapheight - 1, y2);
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for (int y = y1; y <= y2; ++y)
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{
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for (int x = x1; x <= x2; ++x)
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{
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FBlockNode **link = &blocklinks[y*bmapwidth + x];
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FBlockNode *node = FBlockNode::Create (this, x, y);
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// Link in to block
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if ((node->NextActor = *link) != NULL)
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{
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(*link)->PrevActor = &node->NextActor;
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}
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node->PrevActor = link;
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*link = node;
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// Link in to actor
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node->PrevBlock = alink;
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node->NextBlock = NULL;
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(*alink) = node;
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alink = &node->NextBlock;
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}
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}
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}
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}
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}
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//==========================================================================
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//
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// [RH] LinkToWorldForMapThing
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//
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// Emulate buggy PointOnLineSide and fix actors that lie on
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// lines to compensate for some IWAD maps.
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//
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//==========================================================================
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static int R_PointOnSideSlow (fixed_t x, fixed_t y, node_t *node)
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{
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// [RH] This might have been faster than two multiplies and an
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// add on a 386/486, but it certainly isn't on anything newer than that.
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fixed_t dx;
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fixed_t dy;
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double left;
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double right;
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if (!node->dx)
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{
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if (x <= node->x)
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return node->dy > 0;
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return node->dy < 0;
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}
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if (!node->dy)
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{
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if (y <= node->y)
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return node->dx < 0;
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return node->dx > 0;
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}
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dx = (x - node->x);
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dy = (y - node->y);
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// Try to quickly decide by looking at sign bits.
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if ( (node->dy ^ node->dx ^ dx ^ dy)&0x80000000 )
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{
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if ( (node->dy ^ dx) & 0x80000000 )
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{
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// (left is negative)
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return 1;
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}
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return 0;
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}
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// we must use doubles here because the fixed point code will produce errors due to loss of precision for extremely short linedefs.
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left = (double)node->dy * (double)dx;
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right = (double)dy * (double)node->dx;
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if (right < left)
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{
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// front side
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return 0;
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}
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// back side
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return 1;
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}
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sector_t *AActor::LinkToWorldForMapThing ()
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{
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node_t *node = gamenodes + numgamenodes - 1;
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do
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{
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// Use original buggy point-on-side test when spawning
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// things at level load so that the map spots in the
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// emerald key room of Hexen MAP01 are spawned on the
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// window ledge instead of the blocking floor in front
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// of it. Why do I consider it buggy? Because a point
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// that lies directly on a line should always be
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// considered as "in front" of the line. The orientation
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// of the line should be irrelevant.
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node = (node_t *)node->children[R_PointOnSideSlow (x, y, node)];
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}
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while (!((size_t)node & 1));
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subsector_t *ssec = (subsector_t *)((BYTE *)node - 1);
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if (flags4 & MF4_FIXMAPTHINGPOS)
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{
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// If the thing is exactly on a line, move it into the subsector
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// slightly in order to resolve clipping issues in the renderer.
|
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// This check needs to use the blockmap, because an actor on a
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// one-sided line might go into a subsector behind the line, so
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// the line would not be included as one of its subsector's segs.
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int blockx = GetSafeBlockX(x - bmaporgx);
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int blocky = GetSafeBlockY(y - bmaporgy);
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if ((unsigned int)blockx < (unsigned int)bmapwidth &&
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(unsigned int)blocky < (unsigned int)bmapheight)
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{
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int *list;
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for (list = blockmaplump + blockmap[blocky*bmapwidth + blockx] + 1; *list != -1; ++list)
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{
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line_t *ldef = &lines[*list];
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if (ldef->frontsector == ldef->backsector)
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{ // Skip two-sided lines inside a single sector
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continue;
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}
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if (ldef->backsector != NULL)
|
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{
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if (ldef->frontsector->floorplane == ldef->backsector->floorplane &&
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ldef->frontsector->ceilingplane == ldef->backsector->ceilingplane)
|
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{ // Skip two-sided lines without any height difference on either side
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continue;
|
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}
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}
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|
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// Not inside the line's bounding box
|
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if (x + radius <= ldef->bbox[BOXLEFT]
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|| 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;
|
|
fixed_t linelen = (fixed_t)sqrt((double)ldef->dx*ldef->dx + (double)ldef->dy*ldef->dy);
|
|
|
|
P_MakeDivline (ldef, &dll);
|
|
|
|
dlv.x = x;
|
|
dlv.y = y;
|
|
dlv.dx = FixedDiv(dll.dy, linelen);
|
|
dlv.dy = -FixedDiv(dll.dx, linelen);
|
|
|
|
fixed_t distance = abs(P_InterceptVector(&dlv, &dll));
|
|
|
|
if (distance < radius)
|
|
{
|
|
DPrintf ("%s at (%d,%d) lies on %s line %td, distance = %f\n",
|
|
this->GetClass()->TypeName.GetChars(), x>>FRACBITS, y>>FRACBITS,
|
|
ldef->dx == 0? "vertical" : ldef->dy == 0? "horizontal" : "diagonal",
|
|
ldef-lines, FIXED2FLOAT(distance));
|
|
angle_t finean = R_PointToAngle2 (0, 0, ldef->dx, ldef->dy);
|
|
if (ldef->backsector != NULL && ldef->backsector == ssec->sector)
|
|
{
|
|
finean += ANGLE_90;
|
|
}
|
|
else
|
|
{
|
|
finean -= ANGLE_90;
|
|
}
|
|
finean >>= ANGLETOFINESHIFT;
|
|
|
|
// Get the distance we have to move the object away from the wall
|
|
distance = radius - distance;
|
|
x += FixedMul(distance, finecosine[finean]);
|
|
y += FixedMul(distance, finesine[finean]);
|
|
return P_PointInSector (x, y);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return ssec->sector;
|
|
}
|
|
|
|
void AActor::SetOrigin (fixed_t ix, fixed_t iy, fixed_t iz)
|
|
{
|
|
UnlinkFromWorld ();
|
|
x = ix;
|
|
y = iy;
|
|
z = iz;
|
|
LinkToWorld ();
|
|
floorz = Sector->floorplane.ZatPoint (ix, iy);
|
|
ceilingz = Sector->ceilingplane.ZatPoint (ix, iy);
|
|
P_FindFloorCeiling(this, FFCF_ONLYSPAWNPOS);
|
|
}
|
|
|
|
FBlockNode *FBlockNode::FreeBlocks = NULL;
|
|
|
|
FBlockNode *FBlockNode::Create (AActor *who, int x, int y)
|
|
{
|
|
FBlockNode *block;
|
|
|
|
if (FreeBlocks != NULL)
|
|
{
|
|
block = FreeBlocks;
|
|
FreeBlocks = block->NextBlock;
|
|
}
|
|
else
|
|
{
|
|
block = new FBlockNode;
|
|
}
|
|
block->BlockIndex = x + y*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();
|
|
}
|
|
|
|
FBlockLinesIterator::FBlockLinesIterator(const FBoundingBox &box)
|
|
{
|
|
validcount++;
|
|
maxy = GetSafeBlockY(box.Top() - bmaporgy);
|
|
miny = GetSafeBlockY(box.Bottom() - bmaporgy);
|
|
maxx = GetSafeBlockX(box.Right() - bmaporgx);
|
|
minx = GetSafeBlockX(box.Left() - bmaporgx);
|
|
Reset();
|
|
}
|
|
|
|
|
|
//===========================================================================
|
|
//
|
|
// FBlockLinesIterator :: StartBlock
|
|
//
|
|
//===========================================================================
|
|
|
|
void FBlockLinesIterator::StartBlock(int x, int y)
|
|
{
|
|
curx = x;
|
|
cury = y;
|
|
if (x >= 0 && y >= 0 && x < bmapwidth && y <bmapheight)
|
|
{
|
|
int offset = y*bmapwidth + x;
|
|
polyLink = PolyBlockMap? PolyBlockMap[offset] : NULL;
|
|
polyIndex = 0;
|
|
|
|
// There is an extra entry at the beginning of every block.
|
|
// Apparently, id had originally intended for it to be used
|
|
// to keep track of things, but the final code does not do that.
|
|
list = blockmaplump + *(blockmap + offset) + 1;
|
|
}
|
|
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 = &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);
|
|
}
|
|
}
|
|
|
|
//===========================================================================
|
|
//
|
|
// FBlockThingsIterator :: FBlockThingsIterator
|
|
//
|
|
//===========================================================================
|
|
|
|
FBlockThingsIterator::FBlockThingsIterator()
|
|
: DynHash(0)
|
|
{
|
|
minx = maxx = 0;
|
|
miny = maxy = 0;
|
|
ClearHash();
|
|
block = NULL;
|
|
}
|
|
|
|
FBlockThingsIterator::FBlockThingsIterator(int _minx, int _miny, int _maxx, int _maxy)
|
|
: DynHash(0)
|
|
{
|
|
minx = _minx;
|
|
maxx = _maxx;
|
|
miny = _miny;
|
|
maxy = _maxy;
|
|
ClearHash();
|
|
Reset();
|
|
}
|
|
|
|
FBlockThingsIterator::FBlockThingsIterator(const FBoundingBox &box)
|
|
: DynHash(0)
|
|
{
|
|
maxy = GetSafeBlockY(box.Top() - bmaporgy);
|
|
miny = GetSafeBlockY(box.Bottom() - bmaporgy);
|
|
maxx = GetSafeBlockX(box.Right() - bmaporgx);
|
|
minx = GetSafeBlockX(box.Left() - bmaporgx);
|
|
ClearHash();
|
|
Reset();
|
|
}
|
|
|
|
//===========================================================================
|
|
//
|
|
// FBlockThingsIterator :: ClearHash
|
|
//
|
|
//===========================================================================
|
|
|
|
void FBlockThingsIterator::ClearHash()
|
|
{
|
|
clearbuf(Buckets, countof(Buckets), -1);
|
|
NumFixedHash = 0;
|
|
DynHash.Clear();
|
|
}
|
|
|
|
//===========================================================================
|
|
//
|
|
// FBlockThingsIterator :: StartBlock
|
|
//
|
|
//===========================================================================
|
|
|
|
void FBlockThingsIterator::StartBlock(int x, int y)
|
|
{
|
|
curx = x;
|
|
cury = y;
|
|
if (x >= 0 && y >= 0 && x < bmapwidth && y <bmapheight)
|
|
{
|
|
block = blocklinks[y*bmapwidth + x];
|
|
}
|
|
else
|
|
{
|
|
// invalid block
|
|
block = NULL;
|
|
}
|
|
}
|
|
|
|
//===========================================================================
|
|
//
|
|
// FBlockThingsIterator :: SwitchBlock
|
|
//
|
|
//===========================================================================
|
|
|
|
void FBlockThingsIterator::SwitchBlock(int x, int y)
|
|
{
|
|
minx = maxx = x;
|
|
miny = maxy = y;
|
|
StartBlock(x, y);
|
|
}
|
|
|
|
//===========================================================================
|
|
//
|
|
// FBlockThingsIterator :: Next
|
|
//
|
|
//===========================================================================
|
|
|
|
AActor *FBlockThingsIterator::Next(bool centeronly)
|
|
{
|
|
for (;;)
|
|
{
|
|
while (block != NULL)
|
|
{
|
|
AActor *me = block->Me;
|
|
FBlockNode *mynode = block;
|
|
HashEntry *entry;
|
|
int i;
|
|
|
|
block = block->NextActor;
|
|
// Don't recheck things that were already checked
|
|
if (mynode->NextBlock == NULL && mynode->PrevBlock == &me->BlockNode)
|
|
{ // This actor doesn't span blocks, so we know it can only ever be checked once.
|
|
return me;
|
|
}
|
|
if (centeronly)
|
|
{
|
|
// Block boundaries for compatibility mode
|
|
fixed_t blockleft = (curx << MAPBLOCKSHIFT) + bmaporgx;
|
|
fixed_t blockright = blockleft + MAPBLOCKSIZE;
|
|
fixed_t blockbottom = (cury << MAPBLOCKSHIFT) + bmaporgy;
|
|
fixed_t blocktop = blockbottom + MAPBLOCKSIZE;
|
|
|
|
// only return actors with the center in this block
|
|
if (me->x >= blockleft && me->x < blockright &&
|
|
me->y >= blockbottom && me->y < blocktop)
|
|
{
|
|
return me;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
size_t hash = ((size_t)me >> 3) % countof(Buckets);
|
|
for (i = Buckets[hash]; i >= 0; )
|
|
{
|
|
entry = GetHashEntry(i);
|
|
if (entry->Actor == me)
|
|
{ // I've already been checked. Skip to the next actor.
|
|
break;
|
|
}
|
|
i = entry->Next;
|
|
}
|
|
if (i < 0)
|
|
{ // Add me to the hash table and return me.
|
|
if (NumFixedHash < (int)countof(FixedHash))
|
|
{
|
|
entry = &FixedHash[NumFixedHash];
|
|
entry->Next = Buckets[hash];
|
|
Buckets[hash] = NumFixedHash++;
|
|
}
|
|
else
|
|
{
|
|
if (DynHash.Size() == 0)
|
|
{
|
|
DynHash.Grow(50);
|
|
}
|
|
i = DynHash.Reserve(1);
|
|
entry = &DynHash[i];
|
|
entry->Next = Buckets[hash];
|
|
Buckets[hash] = i + countof(FixedHash);
|
|
}
|
|
entry->Actor = me;
|
|
return me;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (++curx > maxx)
|
|
{
|
|
curx = minx;
|
|
if (++cury > maxy) return NULL;
|
|
}
|
|
StartBlock(curx, cury);
|
|
}
|
|
}
|
|
|
|
|
|
//===========================================================================
|
|
//
|
|
// FPathTraverse :: Intercepts
|
|
//
|
|
//===========================================================================
|
|
|
|
TArray<intercept_t> FPathTraverse::intercepts(128);
|
|
|
|
|
|
//===========================================================================
|
|
//
|
|
// FPathTraverse :: AddLineIntercepts.
|
|
// Looks for lines in the given block
|
|
// that intercept the given trace
|
|
// to add to the intercepts list.
|
|
//
|
|
// A line is crossed if its endpoints
|
|
// are on opposite sides of the trace.
|
|
//
|
|
//===========================================================================
|
|
|
|
void FPathTraverse::AddLineIntercepts(int bx, int by)
|
|
{
|
|
FBlockLinesIterator it(bx, by, bx, by, true);
|
|
line_t *ld;
|
|
|
|
while ((ld = it.Next()))
|
|
{
|
|
int s1;
|
|
int s2;
|
|
fixed_t frac;
|
|
divline_t dl;
|
|
|
|
// avoid precision problems with two routines
|
|
if ( trace.dx > FRACUNIT*16
|
|
|| trace.dy > FRACUNIT*16
|
|
|| trace.dx < -FRACUNIT*16
|
|
|| trace.dy < -FRACUNIT*16)
|
|
{
|
|
s1 = P_PointOnDivlineSide (ld->v1->x, ld->v1->y, &trace);
|
|
s2 = P_PointOnDivlineSide (ld->v2->x, ld->v2->y, &trace);
|
|
}
|
|
else
|
|
{
|
|
s1 = P_PointOnLineSide (trace.x, trace.y, ld);
|
|
s2 = P_PointOnLineSide (trace.x+trace.dx, trace.y+trace.dy, ld);
|
|
}
|
|
|
|
if (s1 == s2) continue; // line isn't crossed
|
|
|
|
// hit the line
|
|
P_MakeDivline (ld, &dl);
|
|
frac = P_InterceptVector (&trace, &dl);
|
|
|
|
if (frac < 0) continue; // behind source
|
|
|
|
intercept_t newintercept;
|
|
|
|
newintercept.frac = frac;
|
|
newintercept.isaline = true;
|
|
newintercept.done = false;
|
|
newintercept.d.line = ld;
|
|
intercepts.Push (newintercept);
|
|
}
|
|
}
|
|
|
|
|
|
//===========================================================================
|
|
//
|
|
// FPathTraverse :: AddThingIntercepts
|
|
//
|
|
//===========================================================================
|
|
|
|
void FPathTraverse::AddThingIntercepts (int bx, int by, FBlockThingsIterator &it, bool compatible)
|
|
{
|
|
AActor *thing;
|
|
|
|
it.SwitchBlock(bx, by);
|
|
while ((thing = it.Next(compatible)))
|
|
{
|
|
int numfronts = 0;
|
|
divline_t line;
|
|
int i;
|
|
|
|
|
|
if (!compatible)
|
|
{
|
|
// [RH] Don't check a corner to corner crossection for hit.
|
|
// Instead, check against the actual bounding box (but not if compatibility optioned.)
|
|
|
|
// There's probably a smarter way to determine which two sides
|
|
// of the thing face the trace than by trying all four sides...
|
|
for (i = 0; i < 4; ++i)
|
|
{
|
|
switch (i)
|
|
{
|
|
case 0: // Top edge
|
|
line.x = thing->x + thing->radius;
|
|
line.y = thing->y + thing->radius;
|
|
line.dx = -thing->radius * 2;
|
|
line.dy = 0;
|
|
break;
|
|
|
|
case 1: // Right edge
|
|
line.x = thing->x + thing->radius;
|
|
line.y = thing->y - thing->radius;
|
|
line.dx = 0;
|
|
line.dy = thing->radius * 2;
|
|
break;
|
|
|
|
case 2: // Bottom edge
|
|
line.x = thing->x - thing->radius;
|
|
line.y = thing->y - thing->radius;
|
|
line.dx = thing->radius * 2;
|
|
line.dy = 0;
|
|
break;
|
|
|
|
case 3: // Left edge
|
|
line.x = thing->x - thing->radius;
|
|
line.y = thing->y + thing->radius;
|
|
line.dx = 0;
|
|
line.dy = thing->radius * -2;
|
|
break;
|
|
}
|
|
// Check if this side is facing the trace origin
|
|
if (P_PointOnDivlineSide (trace.x, trace.y, &line) == 0)
|
|
{
|
|
numfronts++;
|
|
|
|
// If it is, see if the trace crosses it
|
|
if (P_PointOnDivlineSide (line.x, line.y, &trace) !=
|
|
P_PointOnDivlineSide (line.x + line.dx, line.y + line.dy, &trace))
|
|
{
|
|
// It's a hit
|
|
fixed_t frac = P_InterceptVector (&trace, &line);
|
|
if (frac < 0)
|
|
{ // behind source
|
|
continue;
|
|
}
|
|
|
|
intercept_t newintercept;
|
|
newintercept.frac = frac;
|
|
newintercept.isaline = false;
|
|
newintercept.done = false;
|
|
newintercept.d.thing = thing;
|
|
intercepts.Push (newintercept);
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
// If none of the sides was facing the trace, then the trace
|
|
// must have started inside the box, so add it as an intercept.
|
|
if (numfronts == 0)
|
|
{
|
|
intercept_t newintercept;
|
|
newintercept.frac = 0;
|
|
newintercept.isaline = false;
|
|
newintercept.done = false;
|
|
newintercept.d.thing = thing;
|
|
intercepts.Push (newintercept);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Old code for compatibility purposes
|
|
fixed_t x1, y1, x2, y2;
|
|
int s1, s2;
|
|
divline_t dl;
|
|
fixed_t frac;
|
|
|
|
bool tracepositive = (trace.dx ^ trace.dy)>0;
|
|
|
|
// check a corner to corner crossection for hit
|
|
if (tracepositive)
|
|
{
|
|
x1 = thing->x - thing->radius;
|
|
y1 = thing->y + thing->radius;
|
|
|
|
x2 = thing->x + thing->radius;
|
|
y2 = thing->y - thing->radius;
|
|
}
|
|
else
|
|
{
|
|
x1 = thing->x - thing->radius;
|
|
y1 = thing->y - thing->radius;
|
|
|
|
x2 = thing->x + thing->radius;
|
|
y2 = thing->y + thing->radius;
|
|
}
|
|
|
|
s1 = P_PointOnDivlineSide (x1, y1, &trace);
|
|
s2 = P_PointOnDivlineSide (x2, y2, &trace);
|
|
|
|
if (s1 != s2)
|
|
{
|
|
dl.x = x1;
|
|
dl.y = y1;
|
|
dl.dx = x2-x1;
|
|
dl.dy = y2-y1;
|
|
|
|
frac = P_InterceptVector (&trace, &dl);
|
|
|
|
if (frac >= 0)
|
|
{
|
|
intercept_t newintercept;
|
|
newintercept.frac = frac;
|
|
newintercept.isaline = false;
|
|
newintercept.done = false;
|
|
newintercept.d.thing = thing;
|
|
intercepts.Push (newintercept);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
//===========================================================================
|
|
//
|
|
// FPathTraverse :: Next
|
|
//
|
|
//===========================================================================
|
|
|
|
intercept_t *FPathTraverse::Next()
|
|
{
|
|
intercept_t *in = NULL;
|
|
|
|
fixed_t dist = FIXED_MAX;
|
|
for (unsigned scanpos = intercept_index; scanpos < intercepts.Size (); scanpos++)
|
|
{
|
|
intercept_t *scan = &intercepts[scanpos];
|
|
if (scan->frac < dist && !scan->done)
|
|
{
|
|
dist = scan->frac;
|
|
in = scan;
|
|
}
|
|
}
|
|
|
|
if (dist > maxfrac || in == NULL) return NULL; // checked everything in range
|
|
in->done = true;
|
|
return in;
|
|
}
|
|
|
|
//===========================================================================
|
|
//
|
|
// FPathTraverse
|
|
// Traces a line from x1,y1 to x2,y2,
|
|
//
|
|
//===========================================================================
|
|
|
|
FPathTraverse::FPathTraverse (fixed_t x1, fixed_t y1, fixed_t x2, fixed_t y2, int flags)
|
|
{
|
|
fixed_t xt1, xt2;
|
|
fixed_t yt1, yt2;
|
|
long long _x1, _x2, _y1, _y2;
|
|
|
|
fixed_t xstep;
|
|
fixed_t ystep;
|
|
|
|
fixed_t partialx, partialy;
|
|
|
|
fixed_t xintercept;
|
|
fixed_t yintercept;
|
|
|
|
int mapx;
|
|
int mapy;
|
|
|
|
int mapxstep;
|
|
int mapystep;
|
|
|
|
int count;
|
|
|
|
validcount++;
|
|
intercept_index = intercepts.Size();
|
|
|
|
if ( ((x1-bmaporgx)&(MAPBLOCKSIZE-1)) == 0)
|
|
x1 += FRACUNIT; // don't side exactly on a line
|
|
|
|
if ( ((y1-bmaporgy)&(MAPBLOCKSIZE-1)) == 0)
|
|
y1 += FRACUNIT; // don't side exactly on a line
|
|
|
|
trace.x = x1;
|
|
trace.y = y1;
|
|
if (flags & PT_DELTA)
|
|
{
|
|
trace.dx = x2;
|
|
trace.dy = y2;
|
|
}
|
|
else
|
|
{
|
|
trace.dx = x2 - x1;
|
|
trace.dy = y2 - y1;
|
|
}
|
|
|
|
_x1 = (long long)x1 - bmaporgx;
|
|
_y1 = (long long)y1 - bmaporgy;
|
|
x1 -= bmaporgx;
|
|
y1 -= bmaporgy;
|
|
xt1 = int(_x1 >> MAPBLOCKSHIFT);
|
|
yt1 = int(_y1 >> MAPBLOCKSHIFT);
|
|
|
|
if (flags & PT_DELTA)
|
|
{
|
|
_x2 = _x1 + x2;
|
|
_y2 = _y1 + y2;
|
|
xt2 = int(_x2 >> MAPBLOCKSHIFT);
|
|
yt2 = int(_y2 >> MAPBLOCKSHIFT);
|
|
x2 = (int)_x2;
|
|
y2 = (int)_y2;
|
|
}
|
|
else
|
|
{
|
|
_x2 = (long long)x2 - bmaporgx;
|
|
_y2 = (long long)y2 - bmaporgy;
|
|
x2 -= bmaporgx;
|
|
y2 -= bmaporgy;
|
|
xt2 = int(_x2 >> MAPBLOCKSHIFT);
|
|
yt2 = int(_y2 >> MAPBLOCKSHIFT);
|
|
}
|
|
|
|
if (xt2 > xt1)
|
|
{
|
|
mapxstep = 1;
|
|
partialx = FRACUNIT - ((x1>>MAPBTOFRAC)&(FRACUNIT-1));
|
|
ystep = FixedDiv (y2-y1,abs(x2-x1));
|
|
}
|
|
else if (xt2 < xt1)
|
|
{
|
|
mapxstep = -1;
|
|
partialx = (x1>>MAPBTOFRAC)&(FRACUNIT-1);
|
|
ystep = FixedDiv (y2-y1,abs(x2-x1));
|
|
}
|
|
else
|
|
{
|
|
mapxstep = 0;
|
|
partialx = FRACUNIT;
|
|
ystep = 256*FRACUNIT;
|
|
}
|
|
yintercept = int(_y1>>MAPBTOFRAC) + FixedMul (partialx, ystep);
|
|
|
|
|
|
if (yt2 > yt1)
|
|
{
|
|
mapystep = 1;
|
|
partialy = FRACUNIT - ((y1>>MAPBTOFRAC)&(FRACUNIT-1));
|
|
xstep = FixedDiv (x2-x1,abs(y2-y1));
|
|
}
|
|
else if (yt2 < yt1)
|
|
{
|
|
mapystep = -1;
|
|
partialy = (y1>>MAPBTOFRAC)&(FRACUNIT-1);
|
|
xstep = FixedDiv (x2-x1,abs(y2-y1));
|
|
}
|
|
else
|
|
{
|
|
mapystep = 0;
|
|
partialy = FRACUNIT;
|
|
xstep = 256*FRACUNIT;
|
|
}
|
|
xintercept = int(_x1>>MAPBTOFRAC) + FixedMul (partialy, xstep);
|
|
|
|
// [RH] Fix for traces that pass only through blockmap corners. In that case,
|
|
// xintercept and yintercept can both be set ahead of mapx and mapy, so the
|
|
// for loop would never advance anywhere.
|
|
|
|
if (abs(xstep) == FRACUNIT && abs(ystep) == FRACUNIT)
|
|
{
|
|
if (ystep < 0)
|
|
{
|
|
partialx = FRACUNIT - partialx;
|
|
}
|
|
if (xstep < 0)
|
|
{
|
|
partialy = FRACUNIT - partialy;
|
|
}
|
|
if (partialx == partialy)
|
|
{
|
|
xintercept = xt1 << FRACBITS;
|
|
yintercept = yt1 << FRACBITS;
|
|
}
|
|
}
|
|
|
|
// Step through map blocks.
|
|
// Count is present to prevent a round off error
|
|
// from skipping the break statement.
|
|
mapx = xt1;
|
|
mapy = yt1;
|
|
|
|
bool compatible = (flags & PT_COMPATIBLE) && (i_compatflags & COMPATF_HITSCAN);
|
|
|
|
// we want to use one list of checked actors for the entire operation
|
|
FBlockThingsIterator btit;
|
|
for (count = 0 ; count < 100 ; count++)
|
|
{
|
|
if (flags & PT_ADDLINES)
|
|
{
|
|
AddLineIntercepts(mapx, mapy);
|
|
}
|
|
|
|
if (flags & PT_ADDTHINGS)
|
|
{
|
|
AddThingIntercepts(mapx, mapy, btit, compatible);
|
|
}
|
|
|
|
if (mapx == xt2 && mapy == yt2)
|
|
{
|
|
break;
|
|
}
|
|
|
|
// [RH] Handle corner cases properly instead of pretending they don't exist.
|
|
switch ((((yintercept >> FRACBITS) == mapy) << 1) | ((xintercept >> FRACBITS) == mapx))
|
|
{
|
|
case 0: // neither xintercept nor yintercept match!
|
|
count = 100; // Stop traversing, because somebody screwed up.
|
|
break;
|
|
|
|
case 1: // xintercept matches
|
|
xintercept += xstep;
|
|
mapy += mapystep;
|
|
break;
|
|
|
|
case 2: // yintercept matches
|
|
yintercept += ystep;
|
|
mapx += mapxstep;
|
|
break;
|
|
|
|
case 3: // xintercept and yintercept both match
|
|
// The trace is exiting a block through its corner. Not only does the block
|
|
// being entered need to be checked (which will happen when this loop
|
|
// continues), but the other two blocks adjacent to the corner also need to
|
|
// be checked.
|
|
if (!compatible)
|
|
{
|
|
if (flags & PT_ADDLINES)
|
|
{
|
|
AddLineIntercepts(mapx + mapxstep, mapy);
|
|
AddLineIntercepts(mapx, mapy + mapystep);
|
|
}
|
|
|
|
if (flags & PT_ADDTHINGS)
|
|
{
|
|
AddThingIntercepts(mapx + mapxstep, mapy, btit, false);
|
|
AddThingIntercepts(mapx, mapy + mapystep, btit, false);
|
|
}
|
|
xintercept += xstep;
|
|
yintercept += ystep;
|
|
mapx += mapxstep;
|
|
mapy += mapystep;
|
|
}
|
|
else
|
|
{
|
|
count = 100; // Doom originally did not handle this case so do the same in compatibility mode.
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
maxfrac = FRACUNIT;
|
|
}
|
|
|
|
FPathTraverse::~FPathTraverse()
|
|
{
|
|
intercepts.Resize(intercept_index);
|
|
}
|
|
|
|
|
|
//===========================================================================
|
|
//
|
|
// P_RoughMonsterSearch
|
|
//
|
|
// Searches though the surrounding mapblocks for monsters/players
|
|
// distance is in MAPBLOCKUNITS
|
|
//===========================================================================
|
|
|
|
AActor *P_RoughMonsterSearch (AActor *mo, int distance, bool onlyseekable)
|
|
{
|
|
return P_BlockmapSearch (mo, distance, RoughBlockCheck, (void *)onlyseekable);
|
|
}
|
|
|
|
AActor *P_BlockmapSearch (AActor *mo, int distance, AActor *(*check)(AActor*, int, void *), void *params)
|
|
{
|
|
int blockX;
|
|
int blockY;
|
|
int startX, startY;
|
|
int blockIndex;
|
|
int firstStop;
|
|
int secondStop;
|
|
int thirdStop;
|
|
int finalStop;
|
|
int count;
|
|
AActor *target;
|
|
|
|
startX = GetSafeBlockX(mo->x-bmaporgx);
|
|
startY = GetSafeBlockY(mo->y-bmaporgy);
|
|
validcount++;
|
|
|
|
if (startX >= 0 && startX < bmapwidth && startY >= 0 && startY < bmapheight)
|
|
{
|
|
if ( (target = check (mo, startY*bmapwidth+startX, params)) )
|
|
{ // found a target right away
|
|
return target;
|
|
}
|
|
}
|
|
for (count = 1; count <= distance; count++)
|
|
{
|
|
blockX = clamp (startX-count, 0, bmapwidth-1);
|
|
blockY = clamp (startY-count, 0, bmapheight-1);
|
|
|
|
blockIndex = blockY*bmapwidth+blockX;
|
|
firstStop = startX+count;
|
|
if (firstStop < 0)
|
|
{
|
|
continue;
|
|
}
|
|
if (firstStop >= bmapwidth)
|
|
{
|
|
firstStop = bmapwidth-1;
|
|
}
|
|
secondStop = startY+count;
|
|
if (secondStop < 0)
|
|
{
|
|
continue;
|
|
}
|
|
if (secondStop >= bmapheight)
|
|
{
|
|
secondStop = bmapheight-1;
|
|
}
|
|
thirdStop = secondStop*bmapwidth+blockX;
|
|
secondStop = secondStop*bmapwidth+firstStop;
|
|
firstStop += blockY*bmapwidth;
|
|
finalStop = blockIndex;
|
|
|
|
// Trace the first block section (along the top)
|
|
for (; blockIndex <= firstStop; blockIndex++)
|
|
{
|
|
if ( (target = check (mo, blockIndex, params)) )
|
|
{
|
|
return target;
|
|
}
|
|
}
|
|
// Trace the second block section (right edge)
|
|
for (blockIndex--; blockIndex <= secondStop; blockIndex += bmapwidth)
|
|
{
|
|
if ( (target = check (mo, blockIndex, params)) )
|
|
{
|
|
return target;
|
|
}
|
|
}
|
|
// Trace the third block section (bottom edge)
|
|
for (blockIndex -= bmapwidth; blockIndex >= thirdStop; blockIndex--)
|
|
{
|
|
if ( (target = check (mo, blockIndex, params)) )
|
|
{
|
|
return target;
|
|
}
|
|
}
|
|
// Trace the final block section (left edge)
|
|
for (blockIndex++; blockIndex > finalStop; blockIndex -= bmapwidth)
|
|
{
|
|
if ( (target = check (mo, blockIndex, params)) )
|
|
{
|
|
return target;
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
//===========================================================================
|
|
//
|
|
// RoughBlockCheck
|
|
//
|
|
//===========================================================================
|
|
|
|
static AActor *RoughBlockCheck (AActor *mo, int index, void *param)
|
|
{
|
|
bool onlyseekable = param != NULL;
|
|
FBlockNode *link;
|
|
|
|
for (link = blocklinks[index]; link != NULL; link = link->NextActor)
|
|
{
|
|
if (link->Me != mo)
|
|
{
|
|
if (onlyseekable && !mo->CanSeek(link->Me))
|
|
{
|
|
continue;
|
|
}
|
|
if (mo->IsOkayToAttack (link->Me))
|
|
{
|
|
return link->Me;
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|