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x11: Use swapchain and expose age 

Refactors the `X11Surface` to use the `Swapchain` internally,
which gives us a buffer age implemenation, which we can then use
to change the `Present` struct of the X11 backend to provide age
values to the user.

This change also merged the `Present` struct into the surface
because submits should now happen explicitly via a new `submit`-call
instead of being submitted implicitly on drop.
This allows the buffer to be discarded if rendering fails.
This commit is contained in:
Victoria Brekenfeld 2021-11-24 19:35:50 +01:00
parent 6b3a00fc06
commit 8a5d030a98
4 changed files with 174 additions and 228 deletions
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3
CHANGELOG.md
View File

@ -27,6 +27,9 @@
- Remove `InputBackend::EventError` associated type as it is unneeded since `dispatch_new_events` was removed.
- `Swapchain` does not have a generic Userdata-parameter anymore, but utilizes `UserDataMap` instead
- `GbmBufferedSurface::next_buffer` now additionally returns the age of the buffer
- `Present` was merged into the `X11Surface`
- `X11Surface::buffer` now additionally returns the age of the buffer
- `X11Surface` now has an explicit `submit` function
### Additions

25
anvil/src/x11.rs
View File

@ -204,9 +204,6 @@ pub fn run_x11(log: Logger) {
if state.backend_data.render {
state.backend_data.render = false;
let backend_data = &mut state.backend_data;
match backend_data.surface.present() {
Ok(present) => {
let mut renderer = renderer.borrow_mut();
// We need to borrow everything we want to refer to inside the renderer callback otherwise rustc is unhappy.
@ -219,7 +216,8 @@ pub fn run_x11(log: Logger) {
#[cfg(feature = "debug")]
let fps_texture = &backend_data.fps_texture;
if let Err(err) = renderer.bind(present.buffer().expect("gbm device was destroyed")) {
let (buffer, _age) = backend_data.surface.buffer().expect("gbm device was destroyed");
if let Err(err) = renderer.bind(buffer) {
error!(log, "Error while binding buffer: {}", err);
}
@ -302,10 +300,13 @@ pub fn run_x11(log: Logger) {
.map_err(Into::<SwapBuffersError>::into)
{
Ok(()) => {
// Unbind the buffer and now let the scope end to present.
// Unbind the buffer
if let Err(err) = renderer.unbind() {
error!(log, "Error while unbinding buffer: {}", err);
}
// Submit the buffer
backend_data.surface.submit();
}
Err(err) => {
@ -315,23 +316,15 @@ pub fn run_x11(log: Logger) {
}
}
}
}
Err(err) => {
error!(log, "Failed to allocate buffers to present to window: {}", err);
state.running.store(false, Ordering::SeqCst);
}
}
#[cfg(feature = "debug")]
state.backend_data.fps.tick();
window.set_cursor_visible(cursor_visible);
// Send frame events so that client start drawing their next frame
state
.window_map
.borrow()
.send_frames(start_time.elapsed().as_millis() as u32);
window_map.send_frames(start_time.elapsed().as_millis() as u32);
std::mem::drop(window_map);
display.borrow_mut().flush_clients(&mut state);
}

4
src/backend/x11/error.rs
View File

@ -134,6 +134,10 @@ pub enum AllocateBuffersError {
/// Exporting a dmabuf failed.
#[error("Exporting a dmabuf failed.")]
ExportDmabuf(#[from] GbmConvertError),
/// No free slots
#[error("No free slots in the swapchain")]
NoFreeSlots,
}
impl From<Errno> for AllocateBuffersError {

188
src/backend/x11/mod.rs
View File

@ -76,7 +76,10 @@ mod window_inner;
use self::{buffer::PixmapWrapperExt, window_inner::WindowInner};
use crate::{
backend::{
allocator::dmabuf::{AsDmabuf, Dmabuf},
allocator::{
dmabuf::{AsDmabuf, Dmabuf},
Slot, Swapchain,
},
drm::{node::path_to_type, CreateDrmNodeError, DrmNode, NodeType},
egl::{native::X11DefaultDisplay, EGLDevice, EGLDisplay, Error as EGLError},
input::{Axis, ButtonState, InputEvent, KeyState},
@ -85,7 +88,7 @@ use crate::{
};
use calloop::{EventSource, Poll, PostAction, Readiness, Token, TokenFactory};
use drm_fourcc::{DrmFourcc, DrmModifier};
use gbm::{BufferObject, BufferObjectFlags};
use gbm::BufferObject;
use nix::{
fcntl::{self, OFlag},
sys::stat::Mode,
@ -342,12 +345,12 @@ pub struct X11Surface {
connection: Weak<RustConnection>,
window: Window,
resize: Receiver<Size<u16, Logical>>,
device: gbm::Device<DrmNode>,
swapchain: Swapchain<gbm::Device<DrmNode>, BufferObject<()>>,
format: DrmFourcc,
width: u16,
height: u16,
current: BufferObject<Dmabuf>,
next: BufferObject<Dmabuf>,
current: Option<Slot<BufferObject<()>>>,
next: Option<Slot<BufferObject<()>>>,
}
#[derive(Debug, thiserror::Error)]
@ -451,28 +454,7 @@ impl X11Surface {
let window = backend.window();
let format = window.format().unwrap();
let size = window.size();
let mut current = device
.create_buffer_object_with_modifiers(
size.w as u32,
size.h as u32,
format,
modifiers.iter().cloned(),
)
.map_err(Into::<AllocateBuffersError>::into)?;
current
.set_userdata(current.export().map_err(Into::<AllocateBuffersError>::into)?)
.map_err(Into::<AllocateBuffersError>::into)?;
let mut next = device
.create_buffer_object_with_modifiers(
size.w as u32,
size.h as u32,
format,
modifiers.iter().cloned(),
)
.map_err(Into::<AllocateBuffersError>::into)?;
next.set_userdata(next.export().map_err(Into::<AllocateBuffersError>::into)?)
.map_err(Into::<AllocateBuffersError>::into)?;
let swapchain = Swapchain::new(device, size.w as u32, size.h as u32, format, modifiers);
let (sender, recv) = mpsc::channel();
@ -481,19 +463,19 @@ impl X11Surface {
Ok(X11Surface {
connection: Arc::downgrade(&backend.connection),
window,
device,
swapchain,
format,
width: size.w,
height: size.h,
current,
next,
current: None,
next: None,
resize: recv,
})
}
/// Returns a handle to the GBM device used to allocate buffers.
pub fn device(&self) -> &gbm::Device<DrmNode> {
&self.device
&self.swapchain.allocator
}
/// Returns the format of the buffers the surface accepts.
@ -501,115 +483,79 @@ impl X11Surface {
self.format
}
/// Returns an RAII scoped object which provides the next buffer.
/// Returns the next buffer that will be presented to the Window and its age.
///
/// When the object is dropped, the contents of the buffer are swapped and then presented.
pub fn present(&mut self) -> Result<Present<'_>, AllocateBuffersError> {
/// You may bind this buffer to a renderer to render.
/// This function will return the same buffer until [`submit`](Self::submit) is called
/// or [`reset_buffers`](Self::reset_buffer) is used to reset the buffers.
pub fn buffer(&mut self) -> Result<(Dmabuf, u8), AllocateBuffersError> {
if let Some(new_size) = self.resize.try_iter().last() {
self.resize(new_size)?;
}
Ok(Present { surface: self })
if self.next.is_none() {
self.next = Some(
self.swapchain
.acquire()
.map_err(Into::<AllocateBuffersError>::into)?
.ok_or(AllocateBuffersError::NoFreeSlots)?,
);
}
fn resize(&mut self, size: Size<u16, Logical>) -> Result<(), AllocateBuffersError> {
let mut current = self
.device
.create_buffer_object(
size.w as u32,
size.h as u32,
self.format,
BufferObjectFlags::empty(),
)
.map_err(Into::<AllocateBuffersError>::into)?;
current
.set_userdata(current.export().map_err(Into::<AllocateBuffersError>::into)?)
.map_err(Into::<AllocateBuffersError>::into)?;
let mut next = self
.device
.create_buffer_object(
size.w as u32,
size.h as u32,
self.format,
BufferObjectFlags::empty(),
)
.map_err(Into::<AllocateBuffersError>::into)?;
next.set_userdata(next.export().map_err(Into::<AllocateBuffersError>::into)?)
.map_err(Into::<AllocateBuffersError>::into)?;
self.width = size.w;
self.height = size.h;
self.current = current;
self.next = next;
Ok(())
let slot = self.next.as_ref().unwrap();
let age = slot.age();
match slot.userdata().get::<Dmabuf>() {
Some(dmabuf) => Ok((dmabuf.clone(), age)),
None => {
let dmabuf = slot.export().map_err(Into::<AllocateBuffersError>::into)?;
slot.userdata().insert_if_missing(|| dmabuf.clone());
Ok((dmabuf, age))
}
}
}
/// An RAII scope containing the next buffer that will be presented to the window. Presentation
/// occurs when the `Present` is dropped.
///
/// The provided buffer may be bound to a [Renderer](crate::backend::renderer::Renderer) to draw to
/// the window.
///
/// ```rust,ignore
/// // Instantiate a new present object to start the process of presenting.
/// let present = surface.present()?;
///
/// // Bind the buffer to the renderer in order to render.
/// renderer.bind(present.buffer())?;
///
/// // Rendering here!
///
/// // Make sure to unbind the buffer when done.
/// renderer.unbind()?;
///
/// // When the `present` is dropped, what was rendered will be presented to the window.
/// ```
#[derive(Debug)]
pub struct Present<'a> {
surface: &'a mut X11Surface,
}
impl Present<'_> {
/// Returns the next buffer that will be presented to the Window.
///
/// You may bind this buffer to a renderer to render.
pub fn buffer(&self) -> Result<Dmabuf, AllocateBuffersError> {
Ok(self
.surface
.next
.userdata()
.map(|dmabuf| dmabuf.cloned())
.map(Option::unwrap)?)
}
}
impl Drop for Present<'_> {
fn drop(&mut self) {
let surface = &mut self.surface;
if let Some(connection) = surface.connection.upgrade() {
/// Consume and submit the buffer to the window.
pub fn submit(&mut self) {
if let Some(connection) = self.connection.upgrade() {
// Swap the buffers
mem::swap(&mut surface.next, &mut surface.current);
if let Some(mut next) = self.next.take() {
if let Some(current) = self.current.as_mut() {
mem::swap(&mut next, current);
self.swapchain.submitted(next);
} else {
self.current = Some(next);
}
}
match surface.current.userdata().map(Option::unwrap) {
Ok(dmabuf) => {
if let Ok(pixmap) = PixmapWrapper::with_dmabuf(&*connection, &surface.window, dmabuf) {
if let Ok(pixmap) = PixmapWrapper::with_dmabuf(
&*connection,
&self.window,
self.current.as_ref().unwrap().userdata().get::<Dmabuf>().unwrap(),
) {
// Now present the current buffer
let _ = pixmap.present(&*connection, &surface.window);
}
}
Err(_err) => {
todo!("Log error")
}
let _ = pixmap.present(&*connection, &self.window);
}
// Flush the connection after presenting to the window to ensure we don't run out of buffer space in the X11 connection.
let _ = connection.flush();
}
}
/// Resets the internal buffers, e.g. to reset age values
pub fn reset_buffers(&mut self) {
self.swapchain.reset_buffers();
self.next = None;
}
fn resize(&mut self, size: Size<u16, Logical>) -> Result<(), AllocateBuffersError> {
self.swapchain.resize(size.w as u32, size.h as u32);
self.next = None;
self.width = size.w;
self.height = size.h;
Ok(())
}
}
/// An X11 window.