Add NUM_TILES_PER_METATILE

include/fieldmap.h

@@ -9,6 +9,8 @@
 #define NUM_PALS_TOTAL 13
 #define MAX_MAP_DATA_SIZE 10240
 
+#define NUM_TILES_PER_METATILE 8
+
 // Map coordinates are offset by 7 when using the map
 // buffer because it needs to load sufficient border
 // metatiles to fill the player's view (the player has