com.bovinelabs.entities

Systems

EntityEventSystem

https://forum.unity.com/threads/batch-entitycommandbuffer.593569/

Easily create lots of events extremely efficiently.

How to use

Instead of using a EntityCommandBuffer, we get a NativeQueue from CreateEventQueue where T is IComponentData, the event data.

NativeQueue<T> EntityEventSystem.CreateEventQueue<T>(JobComponentSystem componentSystem)

It is safe to pass this queue to Jobs, using ToConcurrent() for parallal jobs. Once you have this queue, to create an event simply create, set and add a new type of T to the queue and the EntityEventSystem will handle the rest for you.

The EntityEventSystem will batch create create entities for all these components and then set the component data.

Things to know

• Events live exactly 1 frame. They will be created in EntityEventSystem and 1 frame later destroyed in EntityEventSystem.
• Use of event will be delayed till the next frame. EntityEventSystem executes just before EndFrameBarrier.
• You can use CreateEventQueue for the same type from different systems or even multiple times from the same system.
  • In the case of the same system, it's slightly faster to reuse the same queue if systems have correct dependencies.
• The system calling CreateEventQueue passes a reference to itself to the EntityEventSystem and this is used to ensure dependencies are completed before EntityEventSystem is updated.

CreateBufferEvent

void CreateBufferEvent<T, TB>(T component, NativeArray<TB> buffer)

Works similar to CreateEventQueue except it will add a component T and BufferArray to the entity.

Note: you do not need to worry about disposing the NativeArray as this will be done for you.

Containers

• NativeUnit - Let's you effectively pass a 'reference' of a struct between jobs.

Extensions

• EntityManager - SetComponentObject(Entity, ComponentType, object)
• World - AddManager for creating your own managers dynamically (dependency injection etc)
• List - AddRange(NativeArray), AddRange(NativeList), AddRange(DynamicBuffer), AddRange(NativeSlice), AddRange(void*, int), Resize(int), EnsureLength(int, T)
• DynamicBuffer - Contains(T), IndexOf(T), Remove(T), Reverse(), ResizeInitialized(int), CopyTo(NativeArray)
• NativeList - Reverse(), Insert(T, int), Remove(T), RemoveAt(int), RemoveRange(int, int)