diff options
Diffstat (limited to 'src/doom/p_setup.c')
| -rw-r--r-- | src/doom/p_setup.c | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/src/doom/p_setup.c b/src/doom/p_setup.c index 5cf7a628..2a3a8f85 100644 --- a/src/doom/p_setup.c +++ b/src/doom/p_setup.c @@ -167,6 +167,7 @@ void P_LoadSegs (int lump) line_t* ldef; int linedef; int side; + int sidenum; numsegs = W_LumpLength (lump) / sizeof(mapseg_t); segs = Z_Malloc (numsegs*sizeof(seg_t),PU_LEVEL,0); @@ -179,7 +180,7 @@ void P_LoadSegs (int lump) { li->v1 = &vertexes[SHORT(ml->v1)]; li->v2 = &vertexes[SHORT(ml->v2)]; - + li->angle = (SHORT(ml->angle))<<16; li->offset = (SHORT(ml->offset))<<16; linedef = SHORT(ml->linedef); @@ -188,10 +189,28 @@ void P_LoadSegs (int lump) side = SHORT(ml->side); li->sidedef = &sides[ldef->sidenum[side]]; li->frontsector = sides[ldef->sidenum[side]].sector; - if (ldef-> flags & ML_TWOSIDED) - li->backsector = sides[ldef->sidenum[side^1]].sector; - else + + if (ldef-> flags & ML_TWOSIDED) + { + sidenum = ldef->sidenum[side ^ 1]; + + // If the sidenum is out of range, this may be a "glass hack" + // impassible window. Point at side #0 (this may not be + // the correct Vanilla behavior; however, it seems to work for + // OTTAWAU.WAD, which is the one place I've seen this trick + // used). + + if (sidenum < 0 || sidenum >= numsides) + { + sidenum = 0; + } + + li->backsector = sides[sidenum].sector; + } + else + { li->backsector = 0; + } } W_ReleaseLumpNum(lump); |