metal: allow configuring framebuffer formats

src/ifs/wl_output.rs

@@ -4,6 +4,7 @@ use {
     crate::{
         backend,
         client::{Client, ClientError, ClientId},
+        format::{Format, XRGB8888},
         globals::{Global, GlobalName},
         ifs::{wl_surface::WlSurface, zxdg_output_v1::ZxdgOutputV1},
         leaks::Tracker,
@@ -57,6 +58,8 @@ pub struct WlOutputGlobal {
     pub output_id: Rc<OutputId>,
     pub mode: Cell<backend::Mode>,
     pub modes: Vec<backend::Mode>,
+    pub formats: CloneCell<Rc<Vec<&'static Format>>>,
+    pub format: Cell<&'static Format>,
     pub width_mm: i32,
     pub height_mm: i32,
     pub bindings: RefCell<AHashMap<ClientId, AHashMap<WlOutputId, Rc<WlOutput>>>>,
@@ -152,6 +155,8 @@ impl WlOutputGlobal {
             output_id: output_id.clone(),
             mode: Cell::new(*mode),
             modes,
+            formats: CloneCell::new(Rc::new(vec![])),
+            format: Cell::new(XRGB8888),
             width_mm,
             height_mm,
             bindings: Default::default(),