anvil: use atomic modesetting

anvil/Cargo.toml

@@ -29,5 +29,5 @@ gl_generator = "0.14"
 default = [ "winit", "egl", "udev", "logind" ]
 egl = [ "smithay/use_system_lib" ]
 winit = [ "smithay/backend_winit" ]
-udev = [ "smithay/backend_libinput", "smithay/backend_udev", "smithay/backend_drm_legacy", "smithay/backend_drm_gbm", "smithay/backend_drm_egl", "smithay/backend_session", "input" ]
+udev = [ "smithay/backend_libinput", "smithay/backend_udev", "smithay/backend_drm_atomic", "smithay/backend_drm_gbm", "smithay/backend_drm_egl", "smithay/backend_session", "input" ]
 logind = [ "smithay/backend_session_logind" ]

anvil/src/udev.rs

@@ -22,8 +22,12 @@ use smithay::{
             device_bind,
             egl::{EglDevice, EglSurface},
             gbm::{egl::Gbm as EglGbmBackend, GbmDevice},
-            legacy::LegacyDrmDevice,
-            DevPath, Device, DeviceHandler, Surface,
+            atomic::AtomicDrmDevice,
+            //legacy::LegacyDrmDevice,
+            DevPath,
+            Device,
+            DeviceHandler,
+            Surface,
         },
         graphics::CursorBackend,
         input::InputBackend,
@@ -76,8 +80,9 @@ impl AsRawFd for SessionFd {
 }
 
 type RenderDevice =
-    EglDevice<EglGbmBackend<LegacyDrmDevice<SessionFd>>, GbmDevice<LegacyDrmDevice<SessionFd>>>;
-type RenderSurface = EglSurface<GbmSurface<LegacyDrmDevice<SessionFd>>>;
+    EglDevice<EglGbmBackend<AtomicDrmDevice<SessionFd>>, GbmDevice<AtomicDrmDevice<SessionFd>>>;
+type RenderSurface =
+    EglSurface<GbmSurface<AtomicDrmDevice<SessionFd>>>;
 
 pub fn run_udev(mut display: Display, mut event_loop: EventLoop<AnvilState>, log: Logger) -> Result<(), ()> {
     let name = display.add_socket_auto().unwrap().into_string().unwrap();
@@ -412,7 +417,7 @@ impl<S: SessionNotifier, Data: 'static> UdevHandler for UdevHandlerImpl<S, Data>
             )
             .ok()
             .and_then(
-                |fd| match LegacyDrmDevice::new(SessionFd(fd), self.logger.clone()) {
+                |fd| match AtomicDrmDevice::new(SessionFd(fd), self.logger.clone()) {
                     Ok(drm) => Some(drm),
                     Err(err) => {
                         error!(self.logger, "Skipping drm device, because of error: {}", err);

src/backend/drm/atomic/mod.rs

@@ -1,3 +1,13 @@
+//!
+//! [`RawDevice`](RawDevice) and [`RawSurface`](RawSurface)
+//! implementations using the atomic mode-setting infrastructure.
+//!
+//! Usually this implementation will wrapped into a [`GbmDevice`](::backend::drm::gbm::GbmDevice).
+//! Take a look at `anvil`s source code for an example of this.
+//!
+//! For an example how to use this standalone, take a look at the raw_atomic_drm example.
+//!
+
 use std::cell::RefCell;
 use std::collections::HashMap;
 use std::os::unix::io::{AsRawFd, RawFd};
@@ -26,6 +36,7 @@ use self::surface::AtomicDrmSurfaceInternal;
 #[cfg(feature = "backend_session")]
 pub mod session;
 
+/// Open raw drm device utilizing atomic mode-setting
 pub struct AtomicDrmDevice<A: AsRawFd + 'static> {
     dev: Rc<Dev<A>>,
     dev_id: dev_t,

src/backend/drm/atomic/session.rs

@@ -1,3 +1,8 @@
+//!
+//! Support to register an open [`AtomicDrmDevice`](AtomicDrmDevice)
+//! to an open [`Session`](::backend::session::Session).
+//!
+
 use drm::control::crtc;
 use drm::Device as BasicDevice;
 use nix::libc::dev_t;
@@ -12,6 +17,9 @@ use std::sync::Arc;
 use super::{AtomicDrmDevice, AtomicDrmSurfaceInternal, Dev};
 use crate::backend::session::{AsSessionObserver, SessionObserver};
 
+/// [`SessionObserver`](SessionObserver)
+/// linked to the [`AtomicDrmDevice`](AtomicDrmDevice)
+/// it was created from.
 pub struct AtomicDrmDeviceObserver<A: AsRawFd + 'static> {
     dev: Weak<Dev<A>>,
     dev_id: dev_t,