增加脏标记模式 | add Dirty Flag Pattern

增加脏标记模式 | add Dirty Flag Pattern

Author: QianMo

Assets/Game Programming Patterns/Dirty Flag Pattern.meta

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+//-------------------------------------------------------------------------------------
+//	DirtyFlagPatternExample.cs
+//-------------------------------------------------------------------------------------
+
+using UnityEngine;
+using System.Collections;
+using System;
+
+namespace DirtyFlagPatternExample
+{
+ public class DirtyFlagPatternExample : MonoBehaviour
+ {
+ GraphNode graphNode = new GraphNode(new MeshEX());
+ TransformEX parentWorldTransform = new TransformEX();
+ void Start()
+ {
+ //初始化子节点
+ for (int i = 0; i < graphNode.NumChildren; i++)
+ {
+ graphNode.Children[i] = new GraphNode(new MeshEX());
+ }
+ //进行渲染
+ graphNode.render(TransformEX.origin, true);
+ }
+
+ void Update()
+ {
+ if (Input.GetKeyDown(KeyCode.Alpha1))
+ {
+ //修改位置,触发脏标记
+ TransformEX newLocalTransform = new TransformEX();
+ newLocalTransform.Position = new Vector3(2, 2, 2);
+ graphNode.setTransform(newLocalTransform);
+
+ //再次进行渲染
+ graphNode.render(parentWorldTransform, true);
+ }
+ }
+ }
+
+ /// <summary>
+ /// 网格类
+ /// </summary>
+ class MeshEX
+ {
+
+ }
+
+ /// <summary>
+ /// 位置类
+ /// </summary>
+ class TransformEX
+ {
+ private Vector3 position = new Vector3(1, 1, 1);
+ public Vector3 Position
+ {
+ get { return position; }
+ set { position = value; }
+ }
+
+ public static TransformEX origin = new TransformEX();
+
+ public TransformEX combine(TransformEX other)
+ {
+
+ TransformEX trans = new TransformEX();
+ if (other != null)
+ {
+ trans.Position = Position + other.Position;
+ }
+ return trans;
+ }
+
+ };
+
+ /// <summary>
+ /// 场景图节点
+ /// </summary>
+ class GraphNode
+ {
+ //脏标记 dirty flag
+ private bool dirty_;
+
+ private MeshEX mesh_;
+ private TransformEX local_;
+ private TransformEX world_ = new TransformEX();
+ const int MAX_CHILDREN = 100;
+
+ /// <summary>
+ /// 子节点
+ /// </summary>
+ private GraphNode[] children_ = new GraphNode[MAX_CHILDREN];
+ public GraphNode[] Children
+ {
+ get { return children_; }
+ set { children_ = value; }
+ }
+
+ /// <summary>
+ /// 子节点
+ /// </summary>
+ private int numChildren_ = 88;
+ public int NumChildren
+ {
+ get { return numChildren_; }
+ set { numChildren_ = value; }
+ }
+
+ public GraphNode(MeshEX mesh)
+ {
+ mesh_ = mesh;
+ local_ = TransformEX.origin;
+ dirty_ = true;
+
+ }
+
+ /// <summary>
+ /// 设置局部坐标位置
+ /// </summary>
+ public void setTransform(TransformEX local)
+ {
+ local_ = local;
+ dirty_ = true;
+ }
+
+ /// <summary>
+ /// 渲染
+ /// </summary>
+ public void render(TransformEX parentWorld, bool dirty)
+ {
+ //如果父链中它之上的任何物体标记为脏，则它将被置为true
+ dirty |= dirty_;
+
+ //而当节点没有改动时（dirty=false），跳过combine的过程，否则，表示此链为脏，进行combine
+ if (dirty)
+ {
+ Debug.Log("this node is dirty,combine it!");
+ world_ = local_.combine(parentWorld);
+ dirty_ = false;
+ }
+
+ //渲染mesh
+ if (mesh_ != null)
+ {
+ renderMesh(mesh_, world_);
+ }
+
+ for (int i = 0; i < numChildren_; i++)
+ {
+ if (children_[i] != null)
+ {
+ children_[i].render(world_, dirty);
+ }
+
+ }
+ }
+
+ /// <summary>
+ /// 网格的渲染
+ /// </summary>
+ private void renderMesh(MeshEX mesh_, TransformEX world_)
+ {
+ Debug.Log("renderMesh!");
+ }
+ }
+
+}
+