Partial tower implementation

game/systems/systems.c

@@ -90,6 +90,16 @@ ECS_MOVE(Building, dst, src, {
     *src = (Building) {.type = 0};
 })
 
+ECS_DTOR(AttachedEntity, attacked, {
+    if (ecs_is_alive(ECS, attacked->entity))
+        ecs_delete(ECS,  attacked->entity);
+    attacked->entity = 0;
+})
+ECS_MOVE(AttachedEntity, dst, src, {
+    *dst = *src;
+    src->entity = 0;
+})
+
 void delayDeleteUpdate(ecs_iter_t *it) {
     DelayDelete *delay = ecs_field(it, DelayDelete, 1);
 
@@ -117,6 +127,10 @@ void setupSystems() {
         .dtor = ecs_dtor(Building),
         .move_dtor = ecs_move(Building)
     });
+    ecs_set_hooks(ECS, AttachedEntity, {
+        .dtor = ecs_dtor(AttachedEntity),
+        .move_dtor = ecs_move(AttachedEntity)
+    });
 
     ECS_OBSERVER(ECS, entityPathRemove, EcsOnRemove, Path);
 
@@ -140,6 +154,8 @@ void setupSystems() {
     ECS_SYSTEM(ECS, resetHarvestCount, EcsOnUpdate, Harvestable);
     ECS_SYSTEM(ECS, updateAISystem, EcsOnUpdate, BzBTState);
 
+    ECS_SYSTEM(ECS, updateTower, EcsOnUpdate, Owner, Tower, Position, Size);
+
     ECS_SYSTEM(ECS, updateAnimationState, EcsOnUpdate, Animation, TextureRegion);
     ECS_SYSTEM(ECS, updateAnimation, EcsOnUpdate, Animation, TextureRegion);
     ECS_SYSTEM(ECS, updateEasingSystem, EcsOnUpdate, Easing, Position, HitBox, Rotation);