Dots之路-核心包_JobSystem_01_WaveCube示例

前言

本文为 Metaverse大衍神君 Dots 之路的记录。
仓库地址 RoadToDotsTutorials

基于 GameObject Component 方式

void Start()
{
   cubesList = new List<Transform>();
   for (var z = -zHalfCount; z <= zHalfCount; z++)
   {
	   for (var x = -xHalfCount; x <= xHalfCount; x++)
	   {
		   var cube = Instantiate(cubeAchetype);
		   cube.transform.position = new Vector3(x * 1.1f, 0, z * 1.1f);
		   cubesList.Add(cube.transform);
	   }
   }
}

// Update is called once per frame
void Update()
{
   using (profilerMarker.Auto(cubesList.Count))
   {
	   for (var i = 0; i < cubesList.Count; i++)
	   {
		   var distance = Vector3.Distance(cubesList[i].position, Vector3.zero);
		   cubesList[i].localPosition += Vector3.up * Mathf.Sin(Time.time * 3f + distance * 0.2f);
	   }
   }
}

基于 Job 方式

// 位置更新逻辑
[BurstCompile]
struct WaveCubesJob : IJobParallelForTransform
{
   [ReadOnly] public float elapsedTime;

   public void Execute(int index, TransformAccess transform)
   {
	   var distance = Vector3.Distance(transform.position, Vector3.zero);
	   transform.localPosition += Vector3.up * math.sin(elapsedTime * 3f + distance * 0.2f);
   }
}

public class WaveCubesWithJobs : MonoBehaviour
{
   static readonly ProfilerMarker<int> profilerMarker = new ProfilerMarker<int>("WaveCubesWithJobs UpdateTransform", "Objects Count");
   public GameObject cubeAchetype = null;
   [Range(10, 100)] public int xHalfCount = 40;
   [Range(10, 100)] public int zHalfCount = 40;

   private TransformAccessArray transformAccessArray;

   void Start()
   {
	   transformAccessArray = new TransformAccessArray(4 * xHalfCount * zHalfCount);
	   for (var z = -zHalfCount; z < zHalfCount; z++)
	   {
		   for (var x = -xHalfCount; x < xHalfCount; x++)
		   {
			   var cube = Instantiate(cubeAchetype);
			   cube.transform.position = new Vector3(x * 1.1f, 0, z * 1.1f);
			   transformAccessArray.Add(cube.transform);
		   }
	   }
   }

   void Update()
   {
	   Debug.Log($"TransformAccessArray length: {transformAccessArray.length}");
	   using (profilerMarker.Auto(transformAccessArray.length))
	   {
		   var waveCubesJob = new WaveCubesJob
		   {
			   elapsedTime = Time.time,
		   };
		   JobHandle waveCubesJobhandle = waveCubesJob.Schedule(transformAccessArray);
		   
		   waveCubesJobhandle.Complete();    // 同步到主线程中
	   }
   }

   private void OnDestroy()
   {
	   transformAccessArray.Dispose();
   }
}

• TransformAccessArray (struct): Job 只能使用 Blittable 类型数据和非托管内存堆上的数据，Transform 并不符合要求
• BurstCompile: 使用此标签的部分代码将使用 Brust 编译，可以用于一下内容
  1. Jobs: burst 将会编译 jobs 内的所有内容
  2. Classes：
  3. Structs：
  4. Static methods：
  5. Assemblies：