最近一直在思考如何能更好的做优化渲染，本篇文章只是另一种实现的思路，其实我也没完全想好怎么应用到实际游戏中来统计，希望各位看官多多提宝贵意见。
1.本例Unity的版本是Unity2019.3.1.4
2.采用URP渲染管线，老的渲染管线没有试过，大家可以试试看。
3.FrameDebugger会将每一这数据存入RT中，名字对应如下。
实际代码中就可以这样取到它的Texture了
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Texture texture = Shader.GetGlobalTexture("_CameraColorTexture"); if (!texture) { texture = Shader.GetGlobalTexture("_CameraOpaqueTexture"); } |
并非所有都能取，比如shadowmap的RT，这名字是没有意义的，如果真想取，那就用C#反射吧。 但其实有上面两个基本已经够用了。
4.为了让代码更快的比较两帧图片的颜色，我采用了Burst编译比暴力的for循环快的可不是一点点。
5.为了让工具更加方便，不得不在代码中做了很多反射FrameDebugger的代码。
工具使用之前，大家可以先用FrameDebugger看一下自己需要截那些帧的数据。接着运行Unity，填入开始和结束帧的索引后，点击开始截取按钮即可。
截取完毕后，左边会保存每帧截取的图片，最后还会生成一张第1张和最后一张的中像素变化的图片（红色的区域就表示变化）还会输出最终像素数，重复像素数，总渲染顶点数。
在回到优化上来
1.重复像素数越多，其实就是半透明overdraw比较多。
2.最终像素数表示，光栅化后mesh最终呈现的颜色数。
3.总渲染顶点数，这个数值就很重要的。比如模型参与渲染了好几万个顶点，然而结果最终只贡献给屏幕20个像素，那这显然就不太合理了。
一些问题
1.如果摄像机会移动，那么就会造成有时候离模型近，有时候离的远，这样统计就不准确的。
2.如果使用RenderDoc能看到的信息会更多，我也比较推荐用Renderdoc，这篇文章只是开放一下思路。
上代码
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using System; using System.Collections; using System.IO; using System.Reflection; using UnityEditor; using UnityEngine; using Unity.EditorCoroutines.Editor; using Unity.Collections; using Unity.Burst; using Unity.Jobs; using Unity.Mathematics; public class FrameDebugExamplle : EditorWindow { static Type s_frameDebugType = Type.GetType("UnityEditorInternal.FrameDebuggerUtility,UnityEditor"); static Type s_frameDebugWindowsType = Type.GetType("UnityEditor.FrameDebuggerWindow,UnityEditor"); static bool s_HasLatSample; static NativeArray<Color> s_LastSample2DColor; static NativeArray<Color> s_FirstSample2DColor; static int s_FinalPixel = 0; static int s_ProcessPixel = 0; static int s_VertexCount = 0; static int s_StartDC; static int s_EndDC; static string s_Result; static string DirectoryPath = "Assets/采样"; static EditorWindow s_FrameDebugWindows; [MenuItem("Example/开始")] public static void ShowWindow() { OpenAndEnableFrameDebugger(); } void OnGUI() { int count = (int)s_frameDebugType.GetProperty("count", BindingFlags.Instance | BindingFlags.Public | BindingFlags.Static).GetValue(null); if (count == 0) { //强制打开framedebugger窗口 OpenAndEnableFrameDebugger(); } GUILayout.Label(string.Format($"DC区间 0 - {count}")); s_StartDC = Mathf.Clamp(EditorGUILayout.IntField("开始", s_StartDC),0,count - 1); s_EndDC = Mathf.Max(Mathf.Clamp(EditorGUILayout.IntField("结束", s_EndDC),0,count), s_StartDC); if (GUILayout.Button($"开始截取: {s_StartDC}DC-{s_EndDC}DC", GUILayout.Width(200), GUILayout.Height(50))) { OpenAndEnableFrameDebugger(); EditorCoroutineUtility.StartCoroutineOwnerless(StartGetData()); } GUILayout.Label(s_Result); } //等N帧 IEnumerator WaitFive(int count) { for (int i = 0; i < count; i++) { yield return null; } } //开始获取数据 IEnumerator StartGetData() { s_VertexCount = 0; s_ProcessPixel = 0; s_FinalPixel = 0; s_Result = string.Empty; s_HasLatSample = false; FileUtil.DeleteFileOrDirectory(DirectoryPath); Directory.CreateDirectory(DirectoryPath); for (int i = s_StartDC; i <= s_EndDC; i++) { s_frameDebugType.GetProperty("limit", BindingFlags.Instance | BindingFlags.Public | BindingFlags.Static).SetValue(null, i); yield return WaitFive(1); //等1帧 RefreshFrameDebuggerWindows(); yield return WaitFive(1); //等1帧 //截图 Texture2D textureSample = TextureSample(); Color[] colorBuffer = textureSample.GetPixels(); if (textureSample) { File.WriteAllBytes($"{DirectoryPath}/开始{i}.jpg", textureSample.EncodeToJPG()); if (!s_FirstSample2DColor.IsCreated) { s_FirstSample2DColor = new NativeArray<Color>(colorBuffer, Allocator.Persistent); } if (s_HasLatSample) { //统计差异颜色数 var Job = new JobDiff { result = new NativeArray<int>(1, Allocator.TempJob), current = new NativeArray<Color>(colorBuffer, Allocator.TempJob), last = s_LastSample2DColor, }; Job.Schedule(s_LastSample2DColor.Length, new JobHandle()).Complete(); s_ProcessPixel += Job.result[0]; Job.current.Dispose(); Job.result.Dispose(); s_LastSample2DColor.Dispose(); //统计面数 EditorWindow windows = EditorWindow.GetWindow(s_frameDebugWindowsType); FieldInfo info = windows.GetType().GetField("m_CurEventData", BindingFlags.Instance | BindingFlags.NonPublic); object FrameDebuggerEventData = info.GetValue(windows); if (FrameDebuggerEventData != null) { s_VertexCount += (int)FrameDebuggerEventData.GetType().GetField("vertexCount", BindingFlags.Instance | BindingFlags.Public).GetValue(FrameDebuggerEventData); } } if (i != s_EndDC) { s_HasLatSample = true; s_LastSample2DColor = new NativeArray<Color>(colorBuffer, Allocator.Persistent); } else { //统计最后一张与第一张之间的差异 Texture2D diff = textureSample; var Job = new JobFinalDiff { result = new NativeArray<int>(1, Allocator.TempJob), first = s_FirstSample2DColor, end = new NativeArray<Color>(colorBuffer, Allocator.TempJob), }; Job.Schedule(s_FirstSample2DColor.Length, new JobHandle()).Complete(); s_FinalPixel = Job.result[0]; diff.SetPixels(Job.end.ToArray()); Job.end.Dispose(); Job.result.Dispose(); s_FirstSample2DColor.Dispose(); File.WriteAllBytes($"{DirectoryPath}/变化.jpg", diff.EncodeToJPG()); } } } int pixelSqrt = (int)Mathf.Sqrt((s_ProcessPixel - s_FinalPixel)); int finalPixelSqrt = (int)Mathf.Sqrt(s_FinalPixel); s_Result = $"最终像素 {finalPixelSqrt} X {finalPixelSqrt} 重复像素 {pixelSqrt} x {pixelSqrt} 总渲染顶点数 {s_VertexCount}"; AssetDatabase.Refresh(); } static Texture2D TextureSample() { try { Texture texture = Shader.GetGlobalTexture("_CameraColorTexture"); if (!texture) { texture = Shader.GetGlobalTexture("_CameraOpaqueTexture"); } if (!texture) { Debug.LogError("没有截到图输出错误"); } if (texture) { var width = texture.width; var height = texture.height; RenderTexture previous = RenderTexture.active; RenderTexture tmp = RenderTexture.GetTemporary(width, height, 0, RenderTextureFormat.Default, RenderTextureReadWrite.sRGB); Graphics.Blit(texture, tmp); RenderTexture.active = tmp; Texture2D @new = new Texture2D(width, height); @new.ReadPixels(new Rect(0, 0, width, height), 0, 0); @new.Apply(); RenderTexture.active = previous; return @new; } } catch (Exception e) { Debug.LogError("没有截到图输出错误: " + e); } return null; } static void OpenAndEnableFrameDebugger() { EditorWindow.GetWindow(typeof(FrameDebugExamplle), true, "标题", true); //打开frameDebug窗口 s_FrameDebugWindows = EditorWindow.GetWindow(s_frameDebugWindowsType); s_frameDebugWindowsType.GetMethod("EnableIfNeeded", BindingFlags.Instance | BindingFlags.Public).Invoke(s_FrameDebugWindows, null); } static void RefreshFrameDebuggerWindows() { Type windowsType = Type.GetType("UnityEditor.FrameDebuggerWindow,UnityEditor"); var windows = EditorWindow.GetWindow(windowsType); windowsType.GetMethod("RepaintOnLimitChange", BindingFlags.Instance | BindingFlags.NonPublic).Invoke(windows, null); } [BurstCompile] struct JobDiff : IJobFor { [ReadOnly] public NativeArray<Color> current; [ReadOnly] public NativeArray<Color> last; public NativeArray<int> result; public void Execute(int index) { //干掉分支预测 result[0] += math.select(0, 1, current[index] != last[index]); } } [BurstCompile] struct JobFinalDiff : IJobFor { [ReadOnly] public NativeArray<Color> first; public NativeArray<Color> end; public NativeArray<int> result; public void Execute(int index) { if(end[index] != first[index]) { end[index] = Color.red; result[0]++; } } } } |
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