/// <summary>
/// Get an object from the object pool.
/// </summary>
/// <param name="position"></param>
/// <param name="rotation"></param>
/// <param name="parent"></param>
/// <returns>An instantiation of the pool object, or null if the pool is empty.</returns>
public GameObject GetPooledObject(Vector3 position, Quaternion rotation, Transform parent = null)
{
// make sure the pool is not empty
if (objectPool.Count <= 0)
{
// expand if requested
if (autoExpand && expensionSize > 0)
{
Expand(expensionSize);
}
else
{
Debug.LogError("ObjectPool: Pool is empty");
return(null);
}
}
// prep the item about to be 'instantiated'
objectPool.Peek().Init(position, rotation, parent != null ? parent : null);
PoolItem item = objectPool.Pop();
return(item.gameObject);
}
/// <summary>
/// Expand the pool with the specified number of instantiations.
/// </summary>
/// <param name="size">The expansion size.</param>
private void Expand(int size)
{
// check config
if (pooledObject == null)
{
Debug.LogError("ObjectPool: No object to pool");
return;
}
if (size == 0)
{
Debug.LogError("ObjectPool: Invalid expension size");
return;
}
// expand pool
for (int i = 0; i < size; i++)
{
GameObject new_object = Instantiate(pooledObject);
PoolItem item = new_object.GetComponent <PoolItem>();
item.Pool = this;
AddItem(item);
}
}
