英文:
Entity Query for ISystems and SystemBase in Unity ECS 1.0
问题
我在Unity ECS 1.0中有一个基于瓦片的建筑游戏，在其中我向多个系统添加了特定的IComponentData。从一个MonoBehavior（因为PlayerInput和InputActions没有被转换为ECS），我尝试查询所有具有该IComponentData的系统。但我发现常规的EntityQueries不匹配系统的Entity表示，所以我不得不使用EntityManager.UniversalQueryWithSystems，它返回所有系统的Entity表示。然后我使用for循环检查所有系统是否具有该特定组件。
有人知道是否有更高效的方法来检查这些组件是否存在于系统中吗？
我已经尝试过返回EntityManager.UniversalQueryWithSystems.ToComponentDataArray<MyComponent>()，但然后它会抱怨说，该查询没有使用此组件进行初始化（当然，我不能更改它，因为这不是我的自定义查询）。
英文:
I have a tile based building game in Unity ECS 1.0, where I add particular IComponentData to several systems. From a PlayerInput which is a MonoBehavior (because PlayerInput and InputActions are not translated to ECS), I tried to query all systems having that IComponentData. But I found that regular EntityQueries do not match for Entity representation of systems, so I had to use EntityManager.UniversalQueryWithSystems, which returns the Entity representation of all systems. There I do a for loop and check all systems for that particular component.
Does anybody know if there is a more performant way to check for these components on systems?
I already tried to return EntityManager.UniversalQueryWithSystems.ToComponentDataArray<MyComponent>(), but then it's complaining, that the query have not been initialized using this component (which of course I may not change, as it's not my own query).
答案1
得分: 1
我刚刚找到了。你可以将选项传递给EntityQueryBuilder或调用SystemAPI.Query<>(..)方法并使用.WithOptions(..)，然后只需传递EntityQueryOptions.IncludeSystems。
因此，完整的调用可能如下所示：
public static NativeArray<Entity> GetSystemsManaged<T>() where T : struct, IComponentData
{
if (World.DefaultGameObjectInjectionWorld == null
|| !World.DefaultGameObjectInjectionWorld.IsCreated
|| World.DefaultGameObjectInjectionWorld.EntityManager == null)
{
return new NativeArray<Entity>(0, Allocator.Temp);
}
EntityManager entityManager = World.DefaultGameObjectInjectionWorld.EntityManager;
EntityQueryBuilder queryBuilder = new EntityQueryBuilder(Allocator.Temp)
.WithAll<T>()
.WithOptions(EntityQueryOptions.IncludeSystems);
EntityQuery entityQuery = entityManager.CreateEntityQuery(queryBuilder);
NativeArray<Entity> result = entityQuery.ToEntityArray(Allocator.Temp);
queryBuilder.Dispose();
entityQuery.Dispose();
return result;
}
希望这对你有所帮助！
英文:
I just found it. You can pass options to an EntityQueryBuilder or a call to SystemAPI.Query<>(..) with the method .WithOptions(..) then just pass EntityQueryOptions.IncludeSystems.
So a complete call could look like this:
public static NativeArray<Entity> GetSystemsManaged<T>() where T : struct, IComponentData
{
if (World.DefaultGameObjectInjectionWorld == null
|| !World.DefaultGameObjectInjectionWorld.IsCreated
|| World.DefaultGameObjectInjectionWorld.EntityManager == null)
{
return new NativeArray<Entity>(0, Allocator.Temp);
}
EntityManager entityManager = World.DefaultGameObjectInjectionWorld.EntityManager;
EntityQueryBuilder queryBuilder = new EntityQueryBuilder(Allocator.Temp)
.WithAll<T>()
.WithOptions(EntityQueryOptions.IncludeSystems);
EntityQuery entityQuery = entityManager.CreateEntityQuery(queryBuilder);
NativeArray<Entity> result = entityQuery.ToEntityArray(Allocator.Temp);
queryBuilder.Dispose();
entityQuery.Dispose();
return result;
}
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