c# - 如何将实体传递给作业以添加组件？

问题描述

（编辑：见下面我的编辑）

为了在使用 ECS 时减少样板，我将这段代码变成：

前：

public class MySystem : JobComponentSystem
{
    public struct Group
    {
       // A long list of different ComponentDataArray
       // Eg.
       public ComponentDataArray<Position> Positions;

       public int Length;
    }

    [Inject] private Group _Group;

    protected override JobHandle OnUpdate(JobHandle inputDeps)
    {
        MyJob job = new Job()
        {
           DeltaTime = Time.deltaTime,
           // That same long list of ComponentDataArray
        };
        return job.Schedule(_Group.Positions.Length, 64, inputDeps);
    }

    [BurstCompile]
    struct MyJob : IJobParallelFor
    {
        public float DeltaTime;
        // That same long list of ComponentDataArray AGAIN.

        public void Execute(int i)
        {
             // MyJob code
        }
    }
}

后：

public class MySystem : JobComponentSystem
{
    public struct Group
    {
       // A long list of different ComponentDataArray
       // Eg.
       public ComponentDataArray<Position> Positions;

       public int Length;
    }

    [Inject] private Group _Group;

    protected override JobHandle OnUpdate(JobHandle inputDeps)
    {
        MyJob job = new Job()
        {
           DeltaTime = Time.deltaTime,
           Group = _Group
        };
        return job.Schedule(_Group.Positions.Length, 64, inputDeps);
    }

    [BurstCompile]
    struct MyJob : IJobParallelFor
    {
        public float DeltaTime;
        public Group Group;

        public void Execute(int i)
        {
             // MyJob code
        }
    }
}

在那之前，一切正常。直到我尝试在每个实体初始化后为其添加一个组件。

public class MySystem: JobComponentSystem
{
    public struct Group
    {
        // A long list of different ComponentDataArray
        // Eg.
        public ComponentDataArray<Position> Positions;

        public SubtractiveComponent<Initialized> Initialized;

        public int Length;
        public EntityArray Entities;
    }

    [Inject] private Group _Group;

    public class EntityBarrier : BarrierSystem { }

    [Inject] private EntityBarrier _EntityBarrier;

    protected override JobHandle OnUpdate(JobHandle inputDeps)
    {
        MyJob job = new MyJob()
        {
            DeltaTime = Time.deltaTime,
            Group = _Group,
            CommandBuffer = _EntityBarrier.CreateCommandBuffer()
        };

        return job.Schedule(_Group.Positions.Length, 64, inputDeps);
    }

    [BurstCompile]
    struct MyJob : IJobParallelFor
    {
        public float DeltaTime;
        public Group Group;
        [ReadOnly] public EntityCommandBuffer CommandBuffer;

        public void Execute(int i)
        {
            CommandBuffer.AddComponent(Group.Entities[i], new Initialized());

            // MyJob code
        }
    }
}

它提出了：

InvalidOperationException：NativeArray MyJob.Group.Entities 必须在作业 MySystem:MyJob 中标记为 [ReadOnly]，因为容器本身标记为只读。

但是，如果我确实将其更改为[ReadOnly]，它会抱怨我在到达该行时对其进行了编辑CommandBuffer.AddComponent。

还有哪个容器提到被标记ReadOnly？

是否有另一种方法可以将EntityArray（或向 index 的实体添加组件i）提供给作业，而不需要示例 1 中的所有样板代码？

编辑：如果我像这样手动喂它，仍然会抱怨：

public class MySystem : JobComponentSystem
{
    public struct Group
    {
       // A long list of different ComponentDataArray
       // Eg.
       public ComponentDataArray<Position> Positions;

       public SubtractiveComponent<Initialized> Initialized;

       public int Length;
       public EntityArray Entities;
    }

    [Inject] private Group _Group;

    public class EntityBarrier : BarrierSystem { }

    [Inject] private EntityBarrier _EntityBarrier;

    protected override JobHandle OnUpdate(JobHandle inputDeps)
    {
        MyJob job = new Job()
        {
           DeltaTime = Time.deltaTime,
           Entities = _Group.Entities,
           CommandBuffer = _EntityBarrier.CreateCommandBuffer(),
           // That same long list of ComponentDataArray
        };
        return job.Schedule(_Group.Positions.Length, 64, inputDeps);
    }

    [BurstCompile]
    struct MyJob : IJobParallelFor
    {
        public float DeltaTime;
        public EntityArray Entities;
        // That same long list of ComponentDataArray AGAIN.

        public void Execute(int i)
        {
             CommandBuffer.AddComponent(Entities[i], new Initialized());

             // MyJob code
        }
    }
}

这不就是我们应该做的吗？在这里完成：https ://forum.unity.com/threads/some-beginner-questions-about-pure-ecs.524700/#post-3449277

EDIT2：我在他的代码中发现的唯一区别是

[ReadOnly]public EntityArray Entities;
public EntityCommandBuffer CommandBuffer;

并使用EndFrameBarrier. 我升级了我的代码，但收到：

InvalidOperationException：MyJob.CommandBuffer 未在 IJobParallelFor 作业中声明为 [ReadOnly]。容器不支持并行写入。请使用更合适的容器类型。

因此，为什么我把它ReadOnly放在首位。

标签： c#unity3djobsentity-component-system

c# - 如何将实体传递给作业以添加组件？

问题描述

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