x11: rework impl to allow multiple windows

CHANGELOG.md

@@ -30,6 +30,7 @@
 - `Present` was merged into the `X11Surface`
 - `X11Surface::buffer` now additionally returns the age of the buffer
 - `X11Surface` now has an explicit `submit` function
+- `X11Surface` is now multi-window capable.
 
 ### Additions
 

anvil/src/x11.rs

@@ -12,7 +12,7 @@ use smithay::{
     backend::{
         egl::{EGLContext, EGLDisplay},
         renderer::{gles2::Gles2Renderer, Bind, ImportEgl, Renderer, Transform, Unbind},
-        x11::{X11Backend, X11Event, X11Surface},
+        x11::{WindowBuilder, X11Backend, X11Event, X11Surface},
         SwapBuffersError,
     },
     reexports::{
@@ -59,27 +59,39 @@ pub fn run_x11(log: Logger) {
     let mut event_loop = EventLoop::try_new().unwrap();
     let display = Rc::new(RefCell::new(Display::new()));
 
-    let mut backend = X11Backend::with_title("Anvil", log.clone()).expect("Failed to initialize X11 backend");
+    let backend = X11Backend::new(log.clone()).expect("Failed to initilize X11 backend");
+    let handle = backend.handle();
+
     // Obtain the DRM node the X server uses for direct rendering.
-    let drm_node = backend
+    let drm_node = handle
         .drm_node()
         .expect("Could not get DRM node used by X server");
 
-    // Create the gbm device for buffer allocation and the X11 surface which presents to the window.
+    // Create the gbm device for buffer allocation.
     let device = gbm::Device::new(drm_node).expect("Failed to create gbm device");
-    // Initialize EGL using the GBM device setup earlier.
+    // Initialize EGL using the GBM device.
     let egl = EGLDisplay::new(&device, log.clone()).expect("Failed to create EGLDisplay");
-    let device = Arc::new(Mutex::new(device));
+    // Create the OpenGL context
     let context = EGLContext::new(&egl, log.clone()).expect("Failed to create EGLContext");
-    let surface = X11Surface::new(
-        &mut backend,
-        device,
-        context
-            .dmabuf_render_formats()
-            .iter()
-            .map(|format| format.modifier),
-    )
-    .expect("Failed to create X11 surface");
+
+    let window = WindowBuilder::new()
+        .title("Anvil")
+        .build(&handle)
+        .expect("Failed to create first window");
+
+    let device = Arc::new(Mutex::new(device));
+
+    // Create the surface for the window.
+    let surface = handle
+        .create_surface(
+            &window,
+            device,
+            context
+                .dmabuf_render_formats()
+                .iter()
+                .map(|format| format.modifier),
+        )
+        .expect("Failed to create X11 surface");
 
     let renderer =
         unsafe { Gles2Renderer::new(context, log.clone()) }.expect("Failed to initialize renderer");
@@ -104,8 +116,6 @@ pub fn run_x11(log: Logger) {
         }
     }
 
-    let window = backend.window();
-
     let size = {
         let s = window.size();
 

src/backend/x11/error.rs

@@ -25,10 +25,17 @@ pub enum X11Error {
     #[error("Creating the window failed")]
     CreateWindow(CreateWindowError),
 
-    /// An X11 surface already exists for this backend.
-    #[error("An X11 surface already exists for this backend")]
+    /// An X11 surface already exists for this window.
+    #[error("An X11 surface already exists for this window")]
     SurfaceExists,
 
+    /// An invalid window was used to create an X11 surface.
+    ///
+    /// This error will be risen if the window was destroyed or the window does not belong to the [`X11Handle`](super::X11Handle)
+    /// in use.
+    #[error("An invalid window was used to create an X11 surface")]
+    InvalidWindow,
+
     /// The X server is not capable of direct rendering.
     #[error("The X server is not capable of direct rendering")]
     CannotDirectRender,

src/backend/x11/window_inner.rs

@@ -15,6 +15,7 @@ use super::{extension::Extensions, Atoms, Window, X11Error};
 use drm_fourcc::DrmFourcc;
 use std::sync::{
     atomic::{AtomicU32, AtomicU64},
+    mpsc::Sender,
     Arc, Mutex, Weak,
 };
 use x11rb::{
@@ -60,6 +61,10 @@ pub(crate) struct WindowInner {
     pub atoms: Atoms,
     pub cursor_state: Arc<Mutex<CursorState>>,
     pub size: Mutex<Size<u16, Logical>>,
+    /// Channel used to send resize notifications to the surface that presents to this window.
+    ///
+    /// This value will be [`None`] if no surface is bound to the window.
+    pub resize: Mutex<Option<Sender<Size<u16, Logical>>>>,
     pub next_serial: AtomicU32,
     pub last_msc: Arc<AtomicU64>,
     pub format: DrmFourcc,
@@ -154,6 +159,7 @@ impl WindowInner {
             format,
             depth,
             extensions,
+            resize: Mutex::new(None),
         };
 
         // Enable WM_DELETE_WINDOW so our client is not disconnected upon our toplevel window being destroyed.