qbsp: fix simple_worldspawn_detail_wall

common/bspfile.cc

@@ -381,6 +381,10 @@ public:
 
     bool directional_visible_contents(const contentflags_t &a, const contentflags_t &b) const override
     {
+        if (contents_priority(b) > contents_priority(a)) {
+            return true;
+        }
+
         if (a.is_empty(this)) {
             // empty can always see whatever is in `b`
             return true;

qbsp/merge.cc

@@ -69,7 +69,7 @@ static face_t *TryMerge(face_t *f1, face_t *f2)
     bool keep1, keep2;
 
     if (!f1->w.size() || !f2->w.size() || f1->planeside != f2->planeside || f1->texinfo != f2->texinfo ||
-        !f1->contents[0].equals(options.target_game, f2->contents[0]) || !f1->contents[1].equals(options.target_game, f2->contents[1]) || 
+        /*!f1->contents[0].equals(options.target_game, f2->contents[0]) ||*/ !f1->contents[1].equals(options.target_game, f2->contents[1]) ||
         f1->lmshift[0] != f2->lmshift[0] || f1->lmshift[1] != f2->lmshift[1])
         return NULL;
 

qbsp/surfaces.cc

@@ -769,12 +769,14 @@ static face_t *FaceFromPortal(portal_t *p, int pside)
     {
         f->w = p->winding->flip();
         // fixme-brushbsp: was just `f->contents` on qbsp3
-        f->contents[1] = p->nodes[1]->contents;
+        f->contents[0] = p->nodes[1]->contents;
+        f->contents[1] = p->nodes[0]->contents;
     }
     else
     {
         f->w = *p->winding;
-        f->contents[1] = p->nodes[0]->contents;
+        f->contents[0] = p->nodes[0]->contents;
+        f->contents[1] = p->nodes[1]->contents;
     }
 
     UpdateFaceSphere(f);