diff options
Diffstat (limited to 'src/doom/p_map.c')
| -rw-r--r-- | src/doom/p_map.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/src/doom/p_map.c b/src/doom/p_map.c index 3f88aabc..925e4398 100644 --- a/src/doom/p_map.c +++ b/src/doom/p_map.c @@ -885,7 +885,17 @@ PTR_AimTraverse (intercept_t* in) dist = FixedMul (attackrange, in->frac); - if (li->frontsector->floorheight != li->backsector->floorheight) + // Return false if there is no back sector. This should never + // be the case if the line is two-sided; however, some WADs + // (eg. ottawau.wad) use this as an "impassible glass" trick + // and rely on Vanilla Doom's (unintentional) support for this. + + if (li->backsector == NULL) + { + return false; + } + + if (li->frontsector->floorheight != li->backsector->floorheight) { slope = FixedDiv (openbottom - shootz , dist); if (slope > bottomslope) @@ -973,7 +983,14 @@ boolean PTR_ShootTraverse (intercept_t* in) dist = FixedMul (attackrange, in->frac); - if (li->frontsector->floorheight != li->backsector->floorheight) + // Check if backsector is NULL. See comment in PTR_AimTraverse. + + if (li->backsector == NULL) + { + goto hitline; + } + + if (li->frontsector->floorheight != li->backsector->floorheight) { slope = FixedDiv (openbottom - shootz , dist); if (slope > aimslope) |