增加脏标记模式 | add Dirty Flag Pattern

增加脏标记模式 | add Dirty Flag Pattern

Assets/Game Programming Patterns/Dirty Flag Pattern/Example/DirtyFlagPatternExample.cs

@@ -0,0 +1,168 @@
+//-------------------------------------------------------------------------------------
+//	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!");
+        }
+    }
+
+}
+