metal:layer

(metal:layer ctx)

The CAMetalLayer on the window's content view: the surface frames are presented to, and where the drawable comes from. Part of the metal package, a Metal drawing surface written in rontolisp over objc and loaded on first use: macOS (java -jar, the rontolisp binary, or a compiled .class / .jar; never a .wasm), with a display. See the macOS GUI guide.

CL-USER> (objc:send (metal:layer *ctx*) "drawableSize")
(1280.0 800.0)