how to view output of vertex shader?

I remember seeing in a WDC video how XCode would show the output from a vertex shader in columns next to the input. How do you do that? Is it a feature only in High Sierra?

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If you mean how to preview, see this link and search on 'Editor Area' for discussion:


https://developer.apple.com/library/content/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/ToolsOverview/ToolsOverview.html