OpenGL rendering failure with Mojave and Xcode 10

My app is failing to render under Mojave 10.14.3 when built with Xcode 10.1. It's fine under High Sierra, and it's fine if I build using Xcode 9.4.1. I THINK it was working under Mojave 10.14.2. If I transplant the 10.13 SDK from Xcode 9 to Xcode 10 and build with that, it works.


I wanted to run under OpenGL Profiler to look for OpenGL errors, but then it hangs on -[NSOpenGLContext flushBuffer].

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It looks like it has to do with this change noted in the AppKit 10.14 release notes: "Windows in apps linked against the macOS 10.14 SDK are displayed using Core Animation when the app is running in macOS 10.14." I haven't figured out how to make NSOpenGLContext play nice with Core Animation.

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