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Kart-Public/src/r_bsp.c

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// SONIC ROBO BLAST 2
//-----------------------------------------------------------------------------
// Copyright (C) 1993-1996 by id Software, Inc.
// Copyright (C) 1998-2000 by DooM Legacy Team.
// Copyright (C) 1999-2018 by Sonic Team Junior.
//
// This program is free software distributed under the
// terms of the GNU General Public License, version 2.
// See the 'LICENSE' file for more details.
//-----------------------------------------------------------------------------
/// \file r_bsp.c
/// \brief BSP traversal, handling of LineSegs for rendering
#include "doomdef.h"
#include "g_game.h"
#include "r_local.h"
#include "r_state.h"
#include "r_splats.h"
#include "p_local.h" // camera
#include "p_slopes.h"
#include "z_zone.h" // Check R_Prep3DFloors
seg_t *curline;
side_t *sidedef;
line_t *linedef;
sector_t *frontsector;
sector_t *backsector;
boolean portalline; // is curline a portal seg?
// very ugly realloc() of drawsegs at run-time, I upped it to 512
// instead of 256.. and someone managed to send me a level with
// 896 drawsegs! So too bad here's a limit removal a-la-Boom
drawseg_t *drawsegs = NULL;
drawseg_t *ds_p = NULL;
// indicates doors closed wrt automap bugfix:
INT32 doorclosed;
boolean R_NoEncore(sector_t *sector, boolean ceiling)
{
boolean invertencore = (GETSECSPECIAL(sector->special, 2) == 15);
#if 0 // perfect implementation
INT32 val = GETSECSPECIAL(sector->special, 3);
if (val != 1 && val != 3 // spring panel
#else // optimised, see #define GETSECSPECIAL(i,j) ((i >> ((j-1)*4))&15)
if ((!(sector->special & (1<<8)) || (sector->special & ((4|8)<<8))) // spring panel
#endif
&& GETSECSPECIAL(sector->special, 4) != 6) // sneaker panel
return invertencore;
if (invertencore)
return false;
if (ceiling)
return ((boolean)(sector->flags & SF_FLIPSPECIAL_CEILING));
return ((boolean)(sector->flags & SF_FLIPSPECIAL_FLOOR));
}
//
// R_ClearDrawSegs
//
void R_ClearDrawSegs(void)
{
ds_p = drawsegs;
}
// Fix from boom.
#define MAXSEGS (MAXVIDWIDTH/2+1)
// newend is one past the last valid seg
static cliprange_t *newend;
static cliprange_t solidsegs[MAXSEGS];
//
// R_ClipSolidWallSegment
// Does handle solid walls,
// e.g. single sided LineDefs (middle texture)
// that entirely block the view.
//
static void R_ClipSolidWallSegment(INT32 first, INT32 last)
{
cliprange_t *next;
cliprange_t *start;
// Find the first range that touches the range (adjacent pixels are touching).
start = solidsegs;
while (start->last < first - 1)
start++;
if (first < start->first)
{
if (last < start->first - 1)
{
// Post is entirely visible (above start), so insert a new clippost.
R_StoreWallRange(first, last);
next = newend;
newend++;
// NO MORE CRASHING!
if (newend - solidsegs > MAXSEGS)
I_Error("R_ClipSolidWallSegment: Solid Segs overflow!\n");
while (next != start)
{
*next = *(next-1);
next--;
}
next->first = first;
next->last = last;
return;
}
// There is a fragment above *start.
R_StoreWallRange(first, start->first - 1);
// Now adjust the clip size.
start->first = first;
}
// Bottom contained in start?
if (last <= start->last)
return;
next = start;
while (last >= (next+1)->first - 1)
{
// There is a fragment between two posts.
R_StoreWallRange(next->last + 1, (next+1)->first - 1);
next++;
if (last <= next->last)
{
// Bottom is contained in next.
// Adjust the clip size.
start->last = next->last;
goto crunch;
}
}
// There is a fragment after *next.
R_StoreWallRange(next->last + 1, last);
// Adjust the clip size.
start->last = last;
// Remove start+1 to next from the clip list, because start now covers their area.
crunch:
if (next == start)
return; // Post just extended past the bottom of one post.
while (next++ != newend)
*++start = *next; // Remove a post.
newend = start + 1;
// NO MORE CRASHING!
if (newend - solidsegs > MAXSEGS)
I_Error("R_ClipSolidWallSegment: Solid Segs overflow!\n");
}
//
// R_ClipPassWallSegment
// Clips the given range of columns, but does not include it in the clip list.
// Does handle windows, e.g. LineDefs with upper and lower texture.
//
static inline void R_ClipPassWallSegment(INT32 first, INT32 last)
{
cliprange_t *start;
// Find the first range that touches the range
// (adjacent pixels are touching).
start = solidsegs;
while (start->last < first - 1)
start++;
if (first < start->first)
{
if (last < start->first - 1)
{
// Post is entirely visible (above start).
R_StoreWallRange(first, last);
return;
}
// There is a fragment above *start.
R_StoreWallRange(first, start->first - 1);
}
// Bottom contained in start?
if (last <= start->last)
return;
while (last >= (start+1)->first - 1)
{
// There is a fragment between two posts.
R_StoreWallRange(start->last + 1, (start+1)->first - 1);
start++;
if (last <= start->last)
return;
}
// There is a fragment after *next.
R_StoreWallRange(start->last + 1, last);
}
//
// R_ClearClipSegs
//
void R_ClearClipSegs(void)
{
solidsegs[0].first = -0x7fffffff;
solidsegs[0].last = -1;
solidsegs[1].first = viewwidth;
solidsegs[1].last = 0x7fffffff;
newend = solidsegs + 2;
}
void R_PortalClearClipSegs(INT32 start, INT32 end)
{
solidsegs[0].first = -0x7fffffff;
solidsegs[0].last = start-1;
solidsegs[1].first = end;
solidsegs[1].last = 0x7fffffff;
newend = solidsegs + 2;
}
//
// If player's view height is underneath fake floor, lower the
// drawn ceiling to be just under the floor height, and replace
// the drawn floor and ceiling textures, and light level, with
// the control sector's.
//
// Similar for ceiling, only reflected.
//
sector_t *R_FakeFlat(sector_t *sec, sector_t *tempsec, INT32 *floorlightlevel,
INT32 *ceilinglightlevel, boolean back)
{
INT32 mapnum = -1;
if (floorlightlevel)
*floorlightlevel = sec->floorlightsec == -1 ?
sec->lightlevel : sectors[sec->floorlightsec].lightlevel;
if (ceilinglightlevel)
*ceilinglightlevel = sec->ceilinglightsec == -1 ?
sec->lightlevel : sectors[sec->ceilinglightsec].lightlevel;
// If the sector has a midmap, it's probably from 280 type
if (sec->midmap != -1)
mapnum = sec->midmap;
else if (sec->heightsec != -1)
{
const sector_t *s = &sectors[sec->heightsec];
mobj_t *viewmobj = viewplayer->mo;
INT32 heightsec;
boolean underwater;
UINT8 i;
for (i = 0; i <= splitscreen; i++)
{
if (viewplayer == &players[displayplayers[i]] && camera[i].chase)
{
heightsec = R_PointInSubsector(camera[i].x, camera[i].y)->sector->heightsec;
break;
}
}
if (i > splitscreen && viewmobj)
heightsec = R_PointInSubsector(viewmobj->x, viewmobj->y)->sector->heightsec;
else
return sec;
underwater = (heightsec != -1 && viewz <= sectors[heightsec].floorheight);
// Replace sector being drawn, with a copy to be hacked
*tempsec = *sec;
// Replace floor and ceiling height with other sector's heights.
tempsec->floorheight = s->floorheight;
tempsec->ceilingheight = s->ceilingheight;
mapnum = s->midmap;
if ((underwater && (tempsec-> floorheight = sec->floorheight,
tempsec->ceilingheight = s->floorheight - 1, !back)) || viewz <= s->floorheight)
{ // head-below-floor hack
tempsec->floorpic = s->floorpic;
tempsec->floor_xoffs = s->floor_xoffs;
tempsec->floor_yoffs = s->floor_yoffs;
tempsec->floorpic_angle = s->floorpic_angle;
if (underwater)
{
if (s->ceilingpic == skyflatnum)
{
tempsec->floorheight = tempsec->ceilingheight+1;
tempsec->ceilingpic = tempsec->floorpic;
tempsec->ceiling_xoffs = tempsec->floor_xoffs;
tempsec->ceiling_yoffs = tempsec->floor_yoffs;
tempsec->ceilingpic_angle = tempsec->floorpic_angle;
}
else
{
tempsec->ceilingpic = s->ceilingpic;
tempsec->ceiling_xoffs = s->ceiling_xoffs;
tempsec->ceiling_yoffs = s->ceiling_yoffs;
tempsec->ceilingpic_angle = s->ceilingpic_angle;
}
mapnum = s->bottommap;
}
tempsec->lightlevel = s->lightlevel;
if (floorlightlevel)
*floorlightlevel = s->floorlightsec == -1 ? s->lightlevel
: sectors[s->floorlightsec].lightlevel;
if (ceilinglightlevel)
*ceilinglightlevel = s->ceilinglightsec == -1 ? s->lightlevel
: sectors[s->ceilinglightsec].lightlevel;
}
else if (heightsec != -1 && viewz >= sectors[heightsec].ceilingheight
&& sec->ceilingheight > s->ceilingheight)
{ // Above-ceiling hack
tempsec->ceilingheight = s->ceilingheight;
tempsec->floorheight = s->ceilingheight + 1;
tempsec->floorpic = tempsec->ceilingpic = s->ceilingpic;
tempsec->floor_xoffs = tempsec->ceiling_xoffs = s->ceiling_xoffs;
tempsec->floor_yoffs = tempsec->ceiling_yoffs = s->ceiling_yoffs;
tempsec->floorpic_angle = tempsec->ceilingpic_angle = s->ceilingpic_angle;
mapnum = s->topmap;
if (s->floorpic == skyflatnum) // SKYFIX?
{
tempsec->ceilingheight = tempsec->floorheight-1;
tempsec->floorpic = tempsec->ceilingpic;
tempsec->floor_xoffs = tempsec->ceiling_xoffs;
tempsec->floor_yoffs = tempsec->ceiling_yoffs;
tempsec->floorpic_angle = tempsec->ceilingpic_angle;
}
else
{
tempsec->ceilingheight = sec->ceilingheight;
tempsec->floorpic = s->floorpic;
tempsec->floor_xoffs = s->floor_xoffs;
tempsec->floor_yoffs = s->floor_yoffs;
tempsec->floorpic_angle = s->floorpic_angle;
}
tempsec->lightlevel = s->lightlevel;
if (floorlightlevel)
*floorlightlevel = s->floorlightsec == -1 ? s->lightlevel :
sectors[s->floorlightsec].lightlevel;
if (ceilinglightlevel)
*ceilinglightlevel = s->ceilinglightsec == -1 ? s->lightlevel :
sectors[s->ceilinglightsec].lightlevel;
}
sec = tempsec;
}
if (mapnum >= 0 && (size_t)mapnum < num_extra_colormaps)
sec->extra_colormap = &extra_colormaps[mapnum];
else
sec->extra_colormap = NULL;
return sec;
}
boolean R_IsEmptyLine(seg_t *line, sector_t *front, sector_t *back)
{
return (
#ifdef POLYOBJECTS
!line->polyseg &&
#endif
back->ceilingpic == front->ceilingpic
&& back->floorpic == front->floorpic
#ifdef ESLOPE
&& back->f_slope == front->f_slope
&& back->c_slope == front->c_slope
#endif
&& back->lightlevel == front->lightlevel
&& !line->sidedef->midtexture
// Check offsets too!
&& back->floor_xoffs == front->floor_xoffs
&& back->floor_yoffs == front->floor_yoffs
&& back->floorpic_angle == front->floorpic_angle
&& back->ceiling_xoffs == front->ceiling_xoffs
&& back->ceiling_yoffs == front->ceiling_yoffs
&& back->ceilingpic_angle == front->ceilingpic_angle
// Consider altered lighting.
&& back->floorlightsec == front->floorlightsec
&& back->ceilinglightsec == front->ceilinglightsec
// Consider colormaps
&& back->extra_colormap == front->extra_colormap
&& ((!front->ffloors && !back->ffloors)
|| front->tag == back->tag));
}
//
// R_AddLine
// Clips the given segment and adds any visible pieces to the line list.
//
static void R_AddLine(seg_t *line)
{
INT32 x1, x2;
angle_t angle1, angle2, span, tspan;
static sector_t tempsec;
portalline = false;
if (line->polyseg && !(line->polyseg->flags & POF_RENDERSIDES))
return;
// big room fix
angle1 = R_PointToAngleEx(viewx, viewy, line->v1->x, line->v1->y);
angle2 = R_PointToAngleEx(viewx, viewy, line->v2->x, line->v2->y);
curline = line;
// Clip to view edges.
span = angle1 - angle2;
// Back side? i.e. backface culling?
if (span >= ANGLE_180)
return;
// Global angle needed by segcalc.
rw_angle1 = angle1;
angle1 -= viewangle;
angle2 -= viewangle;
tspan = angle1 + clipangle;
if (tspan > doubleclipangle)
{
tspan -= doubleclipangle;
// Totally off the left edge?
if (tspan >= span)
return;
angle1 = clipangle;
}
tspan = clipangle - angle2;
if (tspan > doubleclipangle)
{
tspan -= doubleclipangle;
// Totally off the left edge?
if (tspan >= span)
return;
angle2 = -(signed)clipangle;
}
// The seg is in the view range, but not necessarily visible.
angle1 = (angle1+ANGLE_90)>>ANGLETOFINESHIFT;
angle2 = (angle2+ANGLE_90)>>ANGLETOFINESHIFT;
x1 = viewangletox[angle1];
x2 = viewangletox[angle2];
// Does not cross a pixel?
if (x1 >= x2) // killough 1/31/98 -- change == to >= for robustness
return;
backsector = line->backsector;
// Portal line
if (line->linedef->special == 40 && line->side == 0)
{
if (portalrender < cv_maxportals.value)
{
// Find the other side!
INT32 line2 = P_FindSpecialLineFromTag(40, line->linedef->tag, -1);
if (line->linedef == &lines[line2])
line2 = P_FindSpecialLineFromTag(40, line->linedef->tag, line2);
if (line2 >= 0) // found it!
{
R_AddPortal(line->linedef-lines, line2, x1, x2); // Remember the lines for later rendering
//return; // Don't fill in that space now!
goto clipsolid;
}
}
// Recursed TOO FAR (viewing a portal within a portal)
// So uhhh, render it as a normal wall instead or something ???
}
// Single sided line?
if (!backsector)
goto clipsolid;
backsector = R_FakeFlat(backsector, &tempsec, NULL, NULL, true);
doorclosed = 0;
// Closed door.
#ifdef ESLOPE
if (frontsector->f_slope || frontsector->c_slope || backsector->f_slope || backsector->c_slope)
{
fixed_t frontf1,frontf2, frontc1, frontc2; // front floor/ceiling ends
fixed_t backf1, backf2, backc1, backc2; // back floor ceiling ends
#define SLOPEPARAMS(slope, end1, end2, normalheight) \
if (slope) { \
end1 = P_GetZAt(slope, line->v1->x, line->v1->y); \
end2 = P_GetZAt(slope, line->v2->x, line->v2->y); \
} else \
end1 = end2 = normalheight;
SLOPEPARAMS(frontsector->f_slope, frontf1, frontf2, frontsector->floorheight)
SLOPEPARAMS(frontsector->c_slope, frontc1, frontc2, frontsector->ceilingheight)
SLOPEPARAMS( backsector->f_slope, backf1, backf2, backsector->floorheight)
SLOPEPARAMS( backsector->c_slope, backc1, backc2, backsector->ceilingheight)
#undef SLOPEPARAMS
if (viewsector != backsector && viewsector != frontsector)
{
if ((backc1 <= frontf1 && backc2 <= frontf2)
|| (backf1 >= frontc1 && backf2 >= frontc2))
{
goto clipsolid;
}
// Check for automap fix. Store in doorclosed for r_segs.c
doorclosed = (backc1 <= backf1 && backc2 <= backf2
&& ((backc1 >= frontc1 && backc2 >= frontc2) || curline->sidedef->toptexture)
&& ((backf1 <= frontf1 && backf2 >= frontf2) || curline->sidedef->bottomtexture)
&& (backsector->ceilingpic != skyflatnum || frontsector->ceilingpic != skyflatnum));
if (doorclosed)
goto clipsolid;
}
// Window.
if (backc1 != frontc1 || backc2 != frontc2
|| backf1 != frontf1 || backf2 != frontf2)
{
goto clippass;
}
}
else
#endif
{
if (viewsector != backsector && viewsector != frontsector)
{
if (backsector->ceilingheight <= frontsector->floorheight
|| backsector->floorheight >= frontsector->ceilingheight)
{
goto clipsolid;
}
// Check for automap fix. Store in doorclosed for r_segs.c
doorclosed = (backsector->ceilingheight <= backsector->floorheight
&& (backsector->ceilingheight >= frontsector->ceilingheight || curline->sidedef->toptexture)
&& (backsector->floorheight <= frontsector->floorheight || curline->sidedef->bottomtexture)
&& (backsector->ceilingpic != skyflatnum || frontsector->ceilingpic != skyflatnum));
if (doorclosed)
goto clipsolid;
}
// Window.
if (backsector->ceilingheight != frontsector->ceilingheight
|| backsector->floorheight != frontsector->floorheight)
{
goto clippass;
}
}
// Reject empty lines used for triggers and special events.
// Identical floor and ceiling on both sides, identical light levels on both sides,
// and no middle texture.
if (R_IsEmptyLine(line, frontsector, backsector))
return;
clippass:
R_ClipPassWallSegment(x1, x2 - 1);
return;
clipsolid:
R_ClipSolidWallSegment(x1, x2 - 1);
}
//
// R_CheckBBox
// Checks BSP node/subtree bounding box.
// Returns true if some part of the bbox might be visible.
//
// | 0 | 1 | 2
// --+---+---+---
// 0 | 0 | 1 | 2
// 1 | 4 | 5 | 6
// 2 | 8 | 9 | A
INT32 checkcoord[12][4] =
{
{3, 0, 2, 1},
{3, 0, 2, 0},
{3, 1, 2, 0},
{0}, // UNUSED
{2, 0, 2, 1},
{0}, // UNUSED
{3, 1, 3, 0},
{0}, // UNUSED
{2, 0, 3, 1},
{2, 1, 3, 1},
{2, 1, 3, 0}
};
static boolean R_CheckBBox(const fixed_t *bspcoord)
{
angle_t angle1, angle2;
INT32 sx1, sx2, boxpos;
const INT32* check;
cliprange_t *start;
// Find the corners of the box that define the edges from current viewpoint.
if ((boxpos = (viewx <= bspcoord[BOXLEFT] ? 0 : viewx < bspcoord[BOXRIGHT] ? 1 : 2) + (viewy >= bspcoord[BOXTOP] ? 0 : viewy > bspcoord[BOXBOTTOM] ? 4 : 8)) == 5)
return true;
check = checkcoord[boxpos];
// big room fix
angle1 = R_PointToAngleEx(viewx, viewy, bspcoord[check[0]], bspcoord[check[1]]) - viewangle;
angle2 = R_PointToAngleEx(viewx, viewy, bspcoord[check[2]], bspcoord[check[3]]) - viewangle;
if ((signed)angle1 < (signed)angle2)
{
if ((angle1 >= ANGLE_180) && (angle1 < ANGLE_270))
angle1 = ANGLE_180-1;
else
angle2 = ANGLE_180;
}
if ((signed)angle2 >= (signed)clipangle) return false;
if ((signed)angle1 <= -(signed)clipangle) return false;
if ((signed)angle1 >= (signed)clipangle) angle1 = clipangle;
if ((signed)angle2 <= -(signed)clipangle) angle2 = 0-clipangle;
// Find the first clippost that touches the source post (adjacent pixels are touching).
angle1 = (angle1+ANGLE_90)>>ANGLETOFINESHIFT;
angle2 = (angle2+ANGLE_90)>>ANGLETOFINESHIFT;
sx1 = viewangletox[angle1];
sx2 = viewangletox[angle2];
// Does not cross a pixel.
if (sx1 >= sx2) return false;
start = solidsegs;
while (start->last < sx2)
start++;
if (sx1 >= start->first && sx2 <= start->last)
return false; // The clippost contains the new span.
return true;
}
#ifdef POLYOBJECTS
size_t numpolys; // number of polyobjects in current subsector
size_t num_po_ptrs; // number of polyobject pointers allocated
polyobj_t **po_ptrs; // temp ptr array to sort polyobject pointers
//
// R_PolyobjCompare
//
// Callback for qsort that compares the z distance of two polyobjects.
// Returns the difference such that the closer polyobject will be
// sorted first.
//
static int R_PolyobjCompare(const void *p1, const void *p2)
{
const polyobj_t *po1 = *(const polyobj_t * const *)p1;
const polyobj_t *po2 = *(const polyobj_t * const *)p2;
return po1->zdist - po2->zdist;
}
//
// R_SortPolyObjects
//
// haleyjd 03/03/06: Here's the REAL meat of Eternity's polyobject system.
// Hexen just figured this was impossible, but as mentioned in polyobj.c,
// it is perfectly doable within the confines of the BSP tree. Polyobjects
// must be sorted to draw in DOOM's front-to-back order within individual
// subsectors. This is a modified version of R_SortVisSprites.
//
void R_SortPolyObjects(subsector_t *sub)
{
if (numpolys)
{
polyobj_t *po;
INT32 i = 0;
// allocate twice the number needed to minimize allocations
if (num_po_ptrs < numpolys*2)
{
// use free instead realloc since faster (thanks Lee ^_^)
free(po_ptrs);
po_ptrs = malloc((num_po_ptrs = numpolys*2)
* sizeof(*po_ptrs));
}
po = sub->polyList;
while (po)
{
po->zdist = R_PointToDist2(viewx, viewy,
po->centerPt.x, po->centerPt.y);
po_ptrs[i++] = po;
po = (polyobj_t *)(po->link.next);
}
// the polyobjects are NOT in any particular order, so use qsort
// 03/10/06: only bother if there are actually polys to sort
if (numpolys >= 2)
{
qsort(po_ptrs, numpolys, sizeof(polyobj_t *),
R_PolyobjCompare);
}
}
}
//
// R_PolysegCompare
//
// Callback for qsort to sort the segs of a polyobject. Returns such that the
// closer one is sorted first. I sure hope this doesn't break anything. -Red
//
static int R_PolysegCompare(const void *p1, const void *p2)
{
const seg_t *seg1 = *(const seg_t * const *)p1;
const seg_t *seg2 = *(const seg_t * const *)p2;
fixed_t dist1v1, dist1v2, dist2v1, dist2v2;
// TODO might be a better way to get distance?
#define pdist(x, y) (FixedMul(R_PointToDist(x, y), FINECOSINE((R_PointToAngle(x, y)-viewangle)>>ANGLETOFINESHIFT))+0xFFFFFFF)
#define vxdist(v) pdist(v->x, v->y)
dist1v1 = vxdist(seg1->v1);
dist1v2 = vxdist(seg1->v2);
dist2v1 = vxdist(seg2->v1);
dist2v2 = vxdist(seg2->v2);
if (min(dist1v1, dist1v2) != min(dist2v1, dist2v2))
return min(dist1v1, dist1v2) - min(dist2v1, dist2v2);
{ // That didn't work, so now let's try this.......
fixed_t delta1, delta2, x1, y1, x2, y2;
vertex_t *near1, *near2, *far1, *far2; // wherever you are~
delta1 = R_PointToDist2(seg1->v1->x, seg1->v1->y, seg1->v2->x, seg1->v2->y);
delta2 = R_PointToDist2(seg2->v1->x, seg2->v1->y, seg2->v2->x, seg2->v2->y);
delta1 = FixedDiv(128<<FRACBITS, delta1);
delta2 = FixedDiv(128<<FRACBITS, delta2);
if (dist1v1 < dist1v2)
{
near1 = seg1->v1;
far1 = seg1->v2;
}
else
{
near1 = seg1->v2;
far1 = seg1->v1;
}
if (dist2v1 < dist2v2)
{
near2 = seg2->v1;
far2 = seg2->v2;
}
else
{
near2 = seg2->v2;
far2 = seg2->v1;
}
x1 = near1->x + FixedMul(far1->x-near1->x, delta1);
y1 = near1->y + FixedMul(far1->y-near1->y, delta1);
x2 = near2->x + FixedMul(far2->x-near2->x, delta2);
y2 = near2->y + FixedMul(far2->y-near2->y, delta2);
return pdist(x1, y1)-pdist(x2, y2);
}
#undef vxdist
#undef pdist
}
//
// R_AddPolyObjects
//
// haleyjd 02/19/06
// Adds all segs in all polyobjects in the given subsector.
//
static void R_AddPolyObjects(subsector_t *sub)
{
polyobj_t *po = sub->polyList;
size_t i, j;
numpolys = 0;
// count polyobjects
while (po)
{
++numpolys;
po = (polyobj_t *)(po->link.next);
}
// sort polyobjects
R_SortPolyObjects(sub);
// render polyobjects
for (i = 0; i < numpolys; ++i)
{
qsort(po_ptrs[i]->segs, po_ptrs[i]->segCount, sizeof(seg_t *), R_PolysegCompare);
for (j = 0; j < po_ptrs[i]->segCount; ++j)
R_AddLine(po_ptrs[i]->segs[j]);
}
}
#endif
//
// R_Subsector
// Determine floor/ceiling planes.
// Add sprites of things in sector.
// Draw one or more line segments.
//
drawseg_t *firstseg;
static void R_Subsector(size_t num)
{
INT32 count, floorlightlevel, ceilinglightlevel, light;
seg_t *line;
subsector_t *sub;
static sector_t tempsec; // Deep water hack
extracolormap_t *floorcolormap;
extracolormap_t *ceilingcolormap;
fixed_t floorcenterz, ceilingcenterz;
#ifdef RANGECHECK
if (num >= numsubsectors)
I_Error("R_Subsector: ss %s with numss = %s\n", sizeu1(num), sizeu2(numsubsectors));
#endif
// subsectors added at run-time
if (num >= numsubsectors)
return;
sub = &subsectors[num];
frontsector = sub->sector;
count = sub->numlines;
line = &segs[sub->firstline];
// Deep water/fake ceiling effect.
frontsector = R_FakeFlat(frontsector, &tempsec, &floorlightlevel, &ceilinglightlevel, false);
floorcolormap = ceilingcolormap = frontsector->extra_colormap;
floorcenterz =
#ifdef ESLOPE
frontsector->f_slope ? P_GetZAt(frontsector->f_slope, frontsector->soundorg.x, frontsector->soundorg.y) :
#endif
frontsector->floorheight;
ceilingcenterz =
#ifdef ESLOPE
frontsector->c_slope ? P_GetZAt(frontsector->c_slope, frontsector->soundorg.x, frontsector->soundorg.y) :
#endif
frontsector->ceilingheight;
// Check and prep all 3D floors. Set the sector floor/ceiling light levels and colormaps.
if (frontsector->ffloors)
{
if (frontsector->moved)
{
frontsector->numlights = sub->sector->numlights = 0;
R_Prep3DFloors(frontsector);
sub->sector->lightlist = frontsector->lightlist;
sub->sector->numlights = frontsector->numlights;
sub->sector->moved = frontsector->moved = false;
}
light = R_GetPlaneLight(frontsector, floorcenterz, false);
if (frontsector->floorlightsec == -1)
floorlightlevel = *frontsector->lightlist[light].lightlevel;
floorcolormap = frontsector->lightlist[light].extra_colormap;
light = R_GetPlaneLight(frontsector, ceilingcenterz, false);
if (frontsector->ceilinglightsec == -1)
ceilinglightlevel = *frontsector->lightlist[light].lightlevel;
ceilingcolormap = frontsector->lightlist[light].extra_colormap;
}
sub->sector->extra_colormap = frontsector->extra_colormap;
if (((
#ifdef ESLOPE
frontsector->f_slope ? P_GetZAt(frontsector->f_slope, viewx, viewy) :
#endif
frontsector->floorheight) < viewz || (frontsector->heightsec != -1
&& sectors[frontsector->heightsec].ceilingpic == skyflatnum)))
{
floorplane = R_FindPlane(frontsector->floorheight, frontsector->floorpic, floorlightlevel,
frontsector->floor_xoffs, frontsector->floor_yoffs, frontsector->floorpic_angle, floorcolormap, NULL
#ifdef POLYOBJECTS_PLANES
, NULL
#endif
#ifdef ESLOPE
, frontsector->f_slope
#endif
, R_NoEncore(frontsector, false));
}
else
floorplane = NULL;
if (((
#ifdef ESLOPE
frontsector->c_slope ? P_GetZAt(frontsector->c_slope, viewx, viewy) :
#endif
frontsector->ceilingheight) > viewz || frontsector->ceilingpic == skyflatnum
|| (frontsector->heightsec != -1
&& sectors[frontsector->heightsec].floorpic == skyflatnum)))
{
ceilingplane = R_FindPlane(frontsector->ceilingheight, frontsector->ceilingpic,
ceilinglightlevel, frontsector->ceiling_xoffs, frontsector->ceiling_yoffs, frontsector->ceilingpic_angle,
ceilingcolormap, NULL
#ifdef POLYOBJECTS_PLANES
, NULL
#endif
#ifdef ESLOPE
, frontsector->c_slope
#endif
, R_NoEncore(frontsector, true));
}
else
ceilingplane = NULL;
numffloors = 0;
#ifdef ESLOPE
ffloor[numffloors].slope = NULL;
#endif
ffloor[numffloors].plane = NULL;
ffloor[numffloors].polyobj = NULL;
if (frontsector->ffloors)
{
ffloor_t *rover;
fixed_t heightcheck, planecenterz;
for (rover = frontsector->ffloors; rover && numffloors < MAXFFLOORS; rover = rover->next)
{
if (!(rover->flags & FF_EXISTS) || !(rover->flags & FF_RENDERPLANES))
continue;
if (frontsector->cullheight)
{
if (R_DoCulling(frontsector->cullheight, viewsector->cullheight, viewz, *rover->bottomheight, *rover->topheight))
{
rover->norender = leveltime;
continue;
}
}
ffloor[numffloors].plane = NULL;
ffloor[numffloors].polyobj = NULL;
heightcheck =
#ifdef ESLOPE
*rover->b_slope ? P_GetZAt(*rover->b_slope, viewx, viewy) :
#endif
*rover->bottomheight;
planecenterz =
#ifdef ESLOPE
*rover->b_slope ? P_GetZAt(*rover->b_slope, frontsector->soundorg.x, frontsector->soundorg.y) :
#endif
*rover->bottomheight;
if (planecenterz <= ceilingcenterz
&& planecenterz >= floorcenterz
&& ((viewz < heightcheck && !(rover->flags & FF_INVERTPLANES))
|| (viewz > heightcheck && (rover->flags & FF_BOTHPLANES))))
{
light = R_GetPlaneLight(frontsector, planecenterz,
viewz < heightcheck);
ffloor[numffloors].plane = R_FindPlane(*rover->bottomheight, *rover->bottompic,
*frontsector->lightlist[light].lightlevel, *rover->bottomxoffs,
*rover->bottomyoffs, *rover->bottomangle, frontsector->lightlist[light].extra_colormap, rover
#ifdef POLYOBJECTS_PLANES
, NULL
#endif
#ifdef ESLOPE
, *rover->b_slope
#endif
, R_NoEncore(rover->master->frontsector, true));
#ifdef ESLOPE
ffloor[numffloors].slope = *rover->b_slope;
// Tell the renderer this sector has slopes in it.
if (ffloor[numffloors].slope)
frontsector->hasslope = true;
#endif
ffloor[numffloors].height = heightcheck;
ffloor[numffloors].ffloor = rover;
numffloors++;
}
if (numffloors >= MAXFFLOORS)
break;
ffloor[numffloors].plane = NULL;
ffloor[numffloors].polyobj = NULL;
heightcheck =
#ifdef ESLOPE
*rover->t_slope ? P_GetZAt(*rover->t_slope, viewx, viewy) :
#endif
*rover->topheight;
planecenterz =
#ifdef ESLOPE
*rover->t_slope ? P_GetZAt(*rover->t_slope, frontsector->soundorg.x, frontsector->soundorg.y) :
#endif
*rover->topheight;
if (planecenterz >= floorcenterz
&& planecenterz <= ceilingcenterz
&& ((viewz > heightcheck && !(rover->flags & FF_INVERTPLANES))
|| (viewz < heightcheck && (rover->flags & FF_BOTHPLANES))))
{
light = R_GetPlaneLight(frontsector, planecenterz, viewz < heightcheck);
ffloor[numffloors].plane = R_FindPlane(*rover->topheight, *rover->toppic,
*frontsector->lightlist[light].lightlevel, *rover->topxoffs, *rover->topyoffs, *rover->topangle,
frontsector->lightlist[light].extra_colormap, rover
#ifdef POLYOBJECTS_PLANES
, NULL
#endif
#ifdef ESLOPE
, *rover->t_slope
#endif
, R_NoEncore(rover->master->frontsector, false));
#ifdef ESLOPE
ffloor[numffloors].slope = *rover->t_slope;
// Tell the renderer this sector has slopes in it.
if (ffloor[numffloors].slope)
frontsector->hasslope = true;
#endif
ffloor[numffloors].height = heightcheck;
ffloor[numffloors].ffloor = rover;
numffloors++;
}
}
}
#ifdef POLYOBJECTS_PLANES
// Polyobjects have planes, too!
if (sub->polyList)
{
polyobj_t *po = sub->polyList;
sector_t *polysec;
while (po)
{
if (numffloors >= MAXFFLOORS)
break;
if (!(po->flags & POF_RENDERPLANES)) // Don't draw planes
{
po = (polyobj_t *)(po->link.next);
continue;
}
polysec = po->lines[0]->backsector;
ffloor[numffloors].plane = NULL;
if (polysec->floorheight <= ceilingcenterz
&& polysec->floorheight >= floorcenterz
&& (viewz < polysec->floorheight))
{
light = R_GetPlaneLight(frontsector, polysec->floorheight, viewz < polysec->floorheight);
ffloor[numffloors].plane = R_FindPlane(polysec->floorheight, polysec->floorpic,
polysec->lightlevel, polysec->floor_xoffs, polysec->floor_yoffs,
polysec->floorpic_angle-po->angle,
NULL, NULL, po
#ifdef ESLOPE
, NULL // will ffloors be slopable eventually?
#endif
, R_NoEncore(polysec, false));
ffloor[numffloors].height = polysec->floorheight;
ffloor[numffloors].polyobj = po;
#ifdef ESLOPE
ffloor[numffloors].slope = NULL;
#endif
// ffloor[numffloors].ffloor = rover;
po->visplane = ffloor[numffloors].plane;
numffloors++;
}
if (numffloors >= MAXFFLOORS)
break;
ffloor[numffloors].plane = NULL;
if (polysec->ceilingheight >= floorcenterz
&& polysec->ceilingheight <= ceilingcenterz
&& (viewz > polysec->ceilingheight))
{
light = R_GetPlaneLight(frontsector, polysec->ceilingheight, viewz < polysec->ceilingheight);
ffloor[numffloors].plane = R_FindPlane(polysec->ceilingheight, polysec->ceilingpic,
polysec->lightlevel, polysec->ceiling_xoffs, polysec->ceiling_yoffs,
polysec->ceilingpic_angle-po->angle,
NULL, NULL, po
#ifdef ESLOPE
, NULL // will ffloors be slopable eventually?
#endif
, R_NoEncore(polysec, true));
ffloor[numffloors].polyobj = po;
ffloor[numffloors].height = polysec->ceilingheight;
#ifdef ESLOPE
ffloor[numffloors].slope = NULL;
#endif
// ffloor[numffloors].ffloor = rover;
po->visplane = ffloor[numffloors].plane;
numffloors++;
}
po = (polyobj_t *)(po->link.next);
}
}
#endif
#ifdef FLOORSPLATS
if (sub->splats)
R_AddVisibleFloorSplats(sub);
#endif
// killough 9/18/98: Fix underwater slowdown, by passing real sector
// instead of fake one. Improve sprite lighting by basing sprite
// lightlevels on floor & ceiling lightlevels in the surrounding area.
//
// 10/98 killough:
//
// NOTE: TeamTNT fixed this bug incorrectly, messing up sprite lighting!!!
// That is part of the 242 effect!!! If you simply pass sub->sector to
// the old code you will not get correct lighting for underwater sprites!!!
// Either you must pass the fake sector and handle validcount here, on the
// real sector, or you must account for the lighting in some other way,
// like passing it as an argument.
R_AddSprites(sub->sector, (floorlightlevel+ceilinglightlevel)/2);
firstseg = NULL;
#ifdef POLYOBJECTS
// haleyjd 02/19/06: draw polyobjects before static lines
if (sub->polyList)
R_AddPolyObjects(sub);
#endif
while (count--)
{
// CONS_Debug(DBG_GAMELOGIC, "Adding normal line %d...(%d)\n", line->linedef-lines, leveltime);
#ifdef POLYOBJECTS
if (!line->polyseg) // ignore segs that belong to polyobjects
#endif
R_AddLine(line);
line++;
curline = NULL; /* cph 2001/11/18 - must clear curline now we're done with it, so stuff doesn't try using it for other things */
}
}
//
// R_Prep3DFloors
//
// This function creates the lightlists that the given sector uses to light
// floors/ceilings/walls according to the 3D floors.
void R_Prep3DFloors(sector_t *sector)
{
ffloor_t *rover;
ffloor_t *best;
fixed_t bestheight, maxheight;
INT32 count, i, mapnum;
sector_t *sec;
#ifdef ESLOPE
pslope_t *bestslope = NULL;
fixed_t heighttest; // I think it's better to check the Z height at the sector's center
// than assume unsloped heights are accurate indicators of order in sloped sectors. -Red
#endif
count = 1;
for (rover = sector->ffloors; rover; rover = rover->next)
{
if ((rover->flags & FF_EXISTS) && (!(rover->flags & FF_NOSHADE)
|| (rover->flags & FF_CUTLEVEL) || (rover->flags & FF_CUTSPRITES)))
{
count++;
if (rover->flags & FF_DOUBLESHADOW)
count++;
}
}
if (count != sector->numlights)
{
Z_Free(sector->lightlist);
sector->lightlist = Z_Calloc(sizeof (*sector->lightlist) * count, PU_LEVEL, NULL);
sector->numlights = count;
}
else
memset(sector->lightlist, 0, sizeof (lightlist_t) * count);
#ifdef ESLOPE
heighttest = sector->c_slope ? P_GetZAt(sector->c_slope, sector->soundorg.x, sector->soundorg.y) : sector->ceilingheight;
sector->lightlist[0].height = heighttest + 1;
sector->lightlist[0].slope = sector->c_slope;
#else
sector->lightlist[0].height = sector->ceilingheight + 1;
#endif
sector->lightlist[0].lightlevel = &sector->lightlevel;
sector->lightlist[0].caster = NULL;
sector->lightlist[0].extra_colormap = sector->extra_colormap;
sector->lightlist[0].flags = 0;
maxheight = INT32_MAX;
for (i = 1; i < count; i++)
{
bestheight = INT32_MAX * -1;
best = NULL;
for (rover = sector->ffloors; rover; rover = rover->next)
{
rover->lastlight = 0;
if (!(rover->flags & FF_EXISTS) || (rover->flags & FF_NOSHADE
&& !(rover->flags & FF_CUTLEVEL) && !(rover->flags & FF_CUTSPRITES)))
continue;
#ifdef ESLOPE
heighttest = *rover->t_slope ? P_GetZAt(*rover->t_slope, sector->soundorg.x, sector->soundorg.y) : *rover->topheight;
if (heighttest > bestheight && heighttest < maxheight)
{
best = rover;
bestheight = heighttest;
bestslope = *rover->t_slope;
continue;
}
if (rover->flags & FF_DOUBLESHADOW) {
heighttest = *rover->b_slope ? P_GetZAt(*rover->b_slope, sector->soundorg.x, sector->soundorg.y) : *rover->bottomheight;
if (heighttest > bestheight
&& heighttest < maxheight)
{
best = rover;
bestheight = heighttest;
bestslope = *rover->b_slope;
continue;
}
}
#else
if (*rover->topheight > bestheight && *rover->topheight < maxheight)
{
best = rover;
bestheight = *rover->topheight;
continue;
}
if (rover->flags & FF_DOUBLESHADOW && *rover->bottomheight > bestheight
&& *rover->bottomheight < maxheight)
{
best = rover;
bestheight = *rover->bottomheight;
continue;
}
#endif
}
if (!best)
{
sector->numlights = i;
return;
}
sector->lightlist[i].height = maxheight = bestheight;
sector->lightlist[i].caster = best;
sector->lightlist[i].flags = best->flags;
#ifdef ESLOPE
sector->lightlist[i].slope = bestslope;
#endif
sec = &sectors[best->secnum];
mapnum = sec->midmap;
if (mapnum >= 0 && (size_t)mapnum < num_extra_colormaps)
sec->extra_colormap = &extra_colormaps[mapnum];
else
sec->extra_colormap = NULL;
if (best->flags & FF_NOSHADE)
{
sector->lightlist[i].lightlevel = sector->lightlist[i-1].lightlevel;
sector->lightlist[i].extra_colormap = sector->lightlist[i-1].extra_colormap;
}
else if (best->flags & FF_COLORMAPONLY)
{
sector->lightlist[i].lightlevel = sector->lightlist[i-1].lightlevel;
sector->lightlist[i].extra_colormap = sec->extra_colormap;
}
else
{
sector->lightlist[i].lightlevel = best->toplightlevel;
sector->lightlist[i].extra_colormap = sec->extra_colormap;
}
if (best->flags & FF_DOUBLESHADOW)
{
#ifdef ESLOPE
heighttest = *best->b_slope ? P_GetZAt(*best->b_slope, sector->soundorg.x, sector->soundorg.y) : *best->bottomheight;
if (bestheight == heighttest) ///TODO: do this in a more efficient way -Red
#else
if (bestheight == *best->bottomheight)
#endif
{
sector->lightlist[i].lightlevel = sector->lightlist[best->lastlight].lightlevel;
sector->lightlist[i].extra_colormap =
sector->lightlist[best->lastlight].extra_colormap;
}
else
best->lastlight = i - 1;
}
}
}
INT32 R_GetPlaneLight(sector_t *sector, fixed_t planeheight, boolean underside)
{
INT32 i;
if (!underside)
{
for (i = 1; i < sector->numlights; i++)
if (sector->lightlist[i].height <= planeheight)
return i - 1;
return sector->numlights - 1;
}
for (i = 1; i < sector->numlights; i++)
if (sector->lightlist[i].height < planeheight)
return i - 1;
return sector->numlights - 1;
}
//
// RenderBSPNode
// Renders all subsectors below a given node,
// traversing subtree recursively.
// Just call with BSP root.
//
// killough 5/2/98: reformatted, removed tail recursion
void R_RenderBSPNode(INT32 bspnum)
{
node_t *bsp;
INT32 side;
while (!(bspnum & NF_SUBSECTOR)) // Found a subsector?
{
bsp = &nodes[bspnum];
// Decide which side the view point is on.
side = R_PointOnSide(viewx, viewy, bsp);
// Recursively divide front space.
R_RenderBSPNode(bsp->children[side]);
// Possibly divide back space.
if (!R_CheckBBox(bsp->bbox[side^1]))
return;
bspnum = bsp->children[side^1];
}
// PORTAL CULLING
if (portalcullsector) {
sector_t *sect = subsectors[bspnum & ~NF_SUBSECTOR].sector;
if (sect != portalcullsector)
return;
portalcullsector = NULL;
}
R_Subsector(bspnum == -1 ? 0 : bspnum & ~NF_SUBSECTOR);
}
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