Merged mirrors with portals; Render part of mirrors done, render part of portals needs further testing

src/p_buildmap.cpp

@@ -17,6 +17,7 @@
 #include "g_level.h"
 #include "r_data/colormaps.h"
 #include "gi.h"
+#include "portal.h"
 
 // MACROS ------------------------------------------------------------------
 
@@ -628,6 +629,11 @@ static void LoadWalls (walltype *walls, int numwalls, sectortype *bsec)
 		}
 	}
 
+	// [ZZ] set initial line portal link
+	//      (even though this is rather hard to happen... build doesn't have portals in our sense and it's walls don't get translated into anything like this)
+	for (int i = 0; i < numlines; i++)
+		P_CheckPortal(&lines[i]);
+
 	// Finish setting sector properties that depend on walls
 	for (i = 0; i < numsectors; ++i, ++bsec)
 	{