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Make views explicitly layer-backed on macOS Mojave. (#685)

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On Mojave, views automatically become layer-backed shortly after being added to
a window. Changing the layer-backedness of a view breaks the association
between the view and its associated OpenGL context. To work around this, on
Mojave we explicitly make the view layer-backed up front so that AppKit doesn't
do it itself and break the association with its context.

This was breaking the `window` example in `glutin`.
This commit is contained in:
Patrick Walton 2018-11-05 11:34:54 -08:00 • committed by Francesca Plebani
parent 0fca8e8cb5
commit d2d127a4c4
3 changed files with 14 additions and 2 deletions
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11
src/platform/macos/window.rs
View file

@ -1,5 +1,6 @@
use std;
use std::cell::{Cell, RefCell};
use std::f64;
use std::ops::Deref;
use std::os::raw::c_void;
use std::sync::Weak;
@ -850,6 +851,16 @@ impl Window2 {
let view = new_view(window, shared);
view.non_nil().map(|view| {
view.setWantsBestResolutionOpenGLSurface_(YES);
// On Mojave, views automatically become layer-backed shortly after being added to
// a window. Changing the layer-backedness of a view breaks the association between
// the view and its associated OpenGL context. To work around this, on Mojave we
// explicitly make the view layer-backed up front so that AppKit doesn't do it
// itself and break the association with its context.
if f64::floor(appkit::NSAppKitVersionNumber) > appkit::NSAppKitVersionNumber10_12 {
view.setWantsLayer(YES);
}
window.setContentView_(*view);
window.makeFirstResponder_(*view);
view