Half of day 39 complete.

handmade_tile.h

@@ -1,6 +1,12 @@
 #ifndef HANDMADE_TILE_H_SENTRY
 #define HANDMADE_TILE_H_SENTRY
 
+typedef struct tile_map_difference {
+    F32 dX;
+    F32 dY;
+    F32 dZ;
+} tile_map_difference;
+
 typedef struct tile_map_position {
     U32 AbsTileX;
     U32 AbsTileY;