fix undefined behavior in linearsky calculation (#2157)

fabiangreffrath · Jan 26, 2025 · bdd5630 · bdd5630
1 parent a6b0c1e
commit bdd5630
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/src/r_main.c b/src/r_main.c
@@ -366,7 +366,11 @@ static void R_InitTextureMapping(void)
         ;
       xtoviewangle[x] = (i<<ANGLETOFINESHIFT)-ANG90;
       // [FG] linear horizontal sky scrolling
-      linearskyangle[x] = (0.5 - x / (double)viewwidth) * linearskyfactor;
+      int angle = (0.5 - x / (double)viewwidth) * linearskyfactor;
+      if (angle >= 0)
+        linearskyangle[x] = angle;
+      else
+        linearskyangle[x] = ANG90 + angle;
     }
 
   // Take out the fencepost cases from viewangletox.