(Also I'm unsure how reliable texture from pixmap is with EGL, especially on NVIDIA. There is usually only one way that actually works.)
There's an API to convert a surface to a Mach port and back, as I recall. I believe XPC services is built on Mach ports anyway.
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AFAIK to be able to use Mach ports that way, you need to go through XPC or make the thing global.
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