//
// R_AddLine
// Clips the given segment
// and adds any visible pieces to the line list.
//
static void R_AddLine(const seg_t* segline)
{
dcol.color = ((segline - segs) & 31) * 4; // [RH] Color if not texturing line
drawseg_t ds;
wall_t wall;
if (!R_ProjectSeg(segline, &ds, &wall, NEARCLIP))
return;
R_PrepWall(&ds, &wall);
if (R_SolidLineSeg(segline, &wall))
{
doorclosed = true;
R_ClipWallSegment(ds.x1, ds.x2, true);
}
else if (!R_EmptyLineSeg(segline, &wall))
{
doorclosed = false;
R_ClipWallSegment(ds.x1, ds.x2, false);
}
}
//
// R_AddLine
// Clips the given segment
// and adds any visible pieces to the line list.
//
void R_AddLine (seg_t *line)
{
curline = line;
// skip this line if it's not facing the camera
if (R_PointOnSegSide(viewx, viewy, line) != 0)
return;
dcol.color = ((line - segs) & 31) * 4; // [RH] Color if not texturing line
// translate the line seg endpoints from world-space to camera-space
// and store in (t1.x, t1.y) and (t2.x, t2.y)
v2fixed_t t1, t2;
R_RotatePoint(line->v1->x - viewx, line->v1->y - viewy, ANG90 - viewangle, t1.x, t1.y);
R_RotatePoint(line->v2->x - viewx, line->v2->y - viewy, ANG90 - viewangle, t2.x, t2.y);
// Clip the line seg to the viewing window
int32_t lclip, rclip;
if (!R_ClipLineToFrustum(&t1, &t2, NEARCLIP, lclip, rclip))
return;
// apply the view frustum clipping to t1 & t2
R_ClipLine(&t1, &t2, lclip, rclip, &t1, &t2);
// project the line endpoints to determine which columns the line seg occupies
int x1 = R_ProjectPointX(t1.x, t1.y);
int x2 = R_ProjectPointX(t2.x, t2.y) - 1;
if (!R_CheckProjectionX(x1, x2))
return;
rw_start = x1;
rw_stop = x2;
// clip the line seg endpoints in world-space
// and store in (w1.x, w1.y) and (w2.x, w2.y)
v2fixed_t w1, w2;
R_ClipLine(line->v1, line->v2, lclip, rclip, &w1, &w2);
// killough 3/8/98, 4/4/98: hack for invisible ceilings / deep water
static sector_t tempsec;
backsector = line->backsector ? R_FakeFlat(line->backsector, &tempsec, NULL, NULL, true) : NULL;
R_PrepWall(w1.x, w1.y, w2.x, w2.y, t1.y, t2.y, x1, x2);
// [SL] Check for single-sided line, closed doors or other scenarios that
// would make this line seg solid.
//
// This fixes the automap floor height bug -- killough 1/18/98:
// killough 4/7/98: optimize: save result in doorclosed for use in r_segs.c
if (!backsector || !(line->linedef->flags & ML_TWOSIDED) ||
(rw_backcz1 <= rw_frontfz1 && rw_backcz2 <= rw_frontfz2) ||
(rw_backfz1 >= rw_frontcz1 && rw_backfz2 >= rw_frontcz2) ||
// if door is closed because back is shut:
((rw_backcz1 <= rw_backfz1 && rw_backcz2 <= rw_backfz2) &&
// preserve a kind of transparent door/lift special effect:
((rw_backcz1 >= rw_frontcz1 && rw_backcz2 >= rw_frontcz2) ||
line->sidedef->toptexture) &&
((rw_backfz1 <= rw_frontfz1 && rw_backfz2 <= rw_frontfz2) ||
line->sidedef->bottomtexture) &&
// properly render skies (consider door "open" if both ceilings are sky):
(backsector->ceilingpic !=skyflatnum || frontsector->ceilingpic!=skyflatnum)))
{
doorclosed = true;
R_ClipWallSegment(x1, x2, true);
return;
}
// 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 (P_IdenticalPlanes(&frontsector->ceilingplane, &backsector->ceilingplane)
&& P_IdenticalPlanes(&frontsector->floorplane, &backsector->floorplane)
&& backsector->lightlevel == frontsector->lightlevel
&& backsector->floorpic == frontsector->floorpic
&& backsector->ceilingpic == frontsector->ceilingpic
&& curline->sidedef->midtexture == 0
// killough 3/7/98: Take flats offsets into account:
&& backsector->floor_xoffs == frontsector->floor_xoffs
&& (backsector->floor_yoffs + backsector->base_floor_yoffs) == (frontsector->floor_yoffs + backsector->base_floor_yoffs)
&& backsector->ceiling_xoffs == frontsector->ceiling_xoffs
&& (backsector->ceiling_yoffs + backsector->base_ceiling_yoffs) == (frontsector->ceiling_yoffs + frontsector->base_ceiling_yoffs)
// killough 4/16/98: consider altered lighting
&& backsector->floorlightsec == frontsector->floorlightsec
&& backsector->ceilinglightsec == frontsector->ceilinglightsec
// [RH] Also consider colormaps
&& backsector->colormap == frontsector->colormap
// [RH] and scaling
&& backsector->floor_xscale == frontsector->floor_xscale
&& backsector->floor_yscale == frontsector->floor_yscale
&& backsector->ceiling_xscale == frontsector->ceiling_xscale
&& backsector->ceiling_yscale == frontsector->ceiling_yscale
// [RH] and rotation
&& (backsector->floor_angle + backsector->base_floor_angle) == (frontsector->floor_angle + frontsector->base_floor_angle)
&& (backsector->ceiling_angle + backsector->base_ceiling_angle) == (frontsector->ceiling_angle + frontsector->base_ceiling_angle)
)
{
return;
}
doorclosed = false;
R_ClipWallSegment(x1, x2, false);
}
