Type Alias PumpInitFn 

pub type PumpInitFn<T> = Box<dyn FnOnce(&Instance, &Adapter, &Surface<'static>) -> Option<PumpInit<T>> + Send>;

Per-backend GPU init, run once the instance / adapter / surface exist (on the pump thread on Windows, inline elsewhere). Returns None on failure (editor stays blank, host survives). Must NOT configure the surface - the pump does that with the returned configuration.

Aliased Type

pub struct PumpInitFn<T>(/* private fields */);