Question How to judge system has IBufferElementData singleton？

Unity provide the api ：ComponentSystemBase.HasSingleton() 。just can use on IComponentData。Here are some way to do it，but I think is not easy ：

1. Use EntityQuery.CalculateEntityCount()
2. Add IComponentData , and judging by this component。
3. create all singleton IBufferElementData ，and don‘t judge it，just use ComponentSystemBase.GetSingletonEntity。

It is strange that you can use GetSingletonEntity() to get a IBufferElementData singleton，but can't use HasSingleton() on IBufferElementData 。and those function internal use the same function : GetSingletonEntityQueryInternal() .

 

hello, need some help !! Thank you

 

You can use EntityQuery or SystemBase to get the entity, then use GetComponentDataFromEntity or BufferFromEntity in SystemBase to check if it has the buffer.

AFAIK there isn't a HasSingleton equivalent/overload for buffer yet.

 

thank you very much