fp: First draft swarming on entity

feely_pona_game.h

@@ -63,8 +63,25 @@ enum FP_GameWaypointArrive
     FP_GameWaypointArrive_WhenWithinEntitySize,
 };
 
+enum FP_GameWaypointType
+{
+    FP_GameWaypointType_At,    // Move to the specified entity
+    FP_GameWaypointType_Side, // Move to the side of the entity specified by the direction
+};
+
+enum FP_GameDirection
+{
+    FP_GameDirection_Up,
+    FP_GameDirection_Down,
+    FP_GameDirection_Left,
+    FP_GameDirection_Right,
+    FP_GameDirection_Count,
+};
+
 struct FP_GameWaypoint
 {
+    FP_GameWaypointType   type;
+    FP_GameDirection      type_direction;
     FP_GameEntityHandle   entity;
     FP_GameWaypointArrive arrive;
     Dqn_f32               value;
@@ -93,14 +110,6 @@ struct FP_GameEntityAction
     uint64_t                 end_at_clock_ms;
 };
 
-enum FP_GameDirection
-{
-    FP_GameDirection_Up,
-    FP_GameDirection_Down,
-    FP_GameDirection_Left,
-    FP_GameDirection_Right,
-};
-
 struct FP_GameRenderSprite
 {
     Dqn_V2                   offset;
@@ -134,6 +143,7 @@ struct FP_GameEntity
     Dqn_FArray<FP_GameRenderSprite, 2>    extra_cosmetic_anims;
 
     FP_SentinelList<FP_GameWaypoint>      waypoints;
+    FP_GameEntityHandle                   aggro_slot[FP_GameDirection_Count];
 
     // NOTE: The entity hit box is positioned at the center of the entity.
     Dqn_V2                                local_hit_box_size;