From 13b8a9912f1bfcbe9d5fa0e1b5cf94336745ee7b Mon Sep 17 00:00:00 2001
From: Pasi Kallinen <paxed@alt.org>
Date: Fri, 3 Apr 2020 20:41:46 +0300
Subject: [PATCH] Flip poison gas clouds

---
 src/sp_lev.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/src/sp_lev.c b/src/sp_lev.c
index 16f42cdba..7ef352f22 100755
--- a/src/sp_lev.c
+++ b/src/sp_lev.c
@@ -610,7 +610,7 @@ boolean extras;
 	    etmp->engr_x = FlipX(etmp->engr_x);
     }
 
-    /* regions */
+    /* level (teleport) regions */
     for (i = 0; i < g.num_lregions; i++) {
 	if (flp & 1) {
 	    g.lregions[i].inarea.y1 = FlipY(g.lregions[i].inarea.y1);
@@ -648,6 +648,35 @@ boolean extras;
 	}
     }
 
+    /* regions (poison clouds, etc) */
+    for (i = 0; i < g.n_regions; i++) {
+        int j, tmp1, tmp2;
+        if (flp & 1) {
+            tmp1 = FlipY(g.regions[i]->bounding_box.ly);
+            tmp2 = FlipY(g.regions[i]->bounding_box.hy);
+            g.regions[i]->bounding_box.ly = min(tmp1, tmp2);
+            g.regions[i]->bounding_box.hy = max(tmp1, tmp2);
+            for (j = 0; j < g.regions[i]->nrects; j++) {
+                tmp1 = FlipY(g.regions[i]->rects[j].ly);
+                tmp2 = FlipY(g.regions[i]->rects[j].hy);
+                g.regions[i]->rects[j].ly = min(tmp1, tmp2);
+                g.regions[i]->rects[j].hy = max(tmp1, tmp2);
+            }
+        }
+        if (flp & 2) {
+            tmp1 = FlipX(g.regions[i]->bounding_box.lx);
+            tmp2 = FlipX(g.regions[i]->bounding_box.hx);
+            g.regions[i]->bounding_box.lx = min(tmp1, tmp2);
+            g.regions[i]->bounding_box.hx = max(tmp1, tmp2);
+            for (j = 0; j < g.regions[i]->nrects; j++) {
+                tmp1 = FlipX(g.regions[i]->rects[j].lx);
+                tmp2 = FlipX(g.regions[i]->rects[j].hx);
+                g.regions[i]->rects[j].lx = min(tmp1, tmp2);
+                g.regions[i]->rects[j].hx = max(tmp1, tmp2);
+            }
+        }
+    }
+
     /* rooms */
     for (sroom = &g.rooms[0]; ; sroom++) {
 	if (sroom->hx < 0)