Viewing Your GPU Workload with the Metal Debugger 利用Metal Debugger来查看显卡工作（排错）

Step through your app’s state on the GPU using various Metal tools in Xcode.
内容：在Xcode中使用Metal变量来步进显卡的程序状态
说明：本文需要结合前面一个程序来熟练 Metal调试。
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Overview

To understand how the computer runs your app or to debug problems, you typically use a debugger. Traditional传统的 debuggers work by pausing on a single thread, but this doesn’t work very well with Metal apps. Xcode provides提供了 a debugger specifically针对性的调试器 for Metal through its frame capture workflow.

To debug a Metal app with the Metal debugger, you capture捕获 a single frame of animation and examine the commands that the app generated to create it.

In this article, you run the Using a Render Pipeline to Render Primitives example through Xcode’s Metal debugger to learn how to examine a Metal app at runtime. 这篇文档，通过运行《Using a Render Pipeline to render Primitives》例子来运行metal调试器，来学习如何实时检查Metal程序运行。

Enable the Metal Debugger in the Xcode Project

In the Rendering example, go into the project’s build settings and change the Metal compiler options so that the debug information includes source code for your shaders. Set “Produce debugging information” for Debug to “Yes, include source code”.
按下图所示打开Metal调试器

Apps shipped to customers shouldn’t contain debugging information, so set Release to No.

Capture a Frame 捕获一帧

The Metal Debugger works in conjunction结合 with Xcode’s Metal frame capture feature. To use the Metal Debugger, first you capture a frame using the following steps. 首先使用下面步骤捕获一帧。
Build and run your project. In the case of Using a Render Pipeline to Render Primitives, the app displays a triangle.