Decoration: Add Schematic decoration type

src/util/numeric.h

@@ -140,6 +140,22 @@ inline v3s16 arealim(v3s16 p, s16 d)
 	return p;
 }
 
+// The naive swap performs better than the xor version
+#define SWAP(t, x, y) do { \
+	t temp = x;            \
+	x = y;                 \
+	y = temp;              \
+} while (0)
+
+inline void sortBoxVerticies(v3s16 &p1, v3s16 &p2) {
+	if (p1.X > p2.X)
+		SWAP(s16, p1.X, p2.X);
+	if (p1.Y > p2.Y)
+		SWAP(s16, p1.Y, p2.Y);
+	if (p1.Z > p2.Z)
+		SWAP(s16, p1.Z, p2.Z);
+}
+
 
 /*
 	See test.cpp for example cases.