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|
use crate::{Backend, Color, Error, Renderer, Settings, Viewport};
use futures::task::SpawnExt;
use iced_native::{futures, mouse};
use raw_window_handle::HasRawWindowHandle;
/// A window graphics backend for iced powered by `wgpu`.
#[allow(missing_debug_implementations)]
pub struct Compositor {
settings: Settings,
instance: wgpu::Instance,
device: wgpu::Device,
queue: wgpu::Queue,
staging_belt: wgpu::util::StagingBelt,
local_pool: futures::executor::LocalPool,
format: wgpu::TextureFormat,
}
impl Compositor {
const CHUNK_SIZE: u64 = 10 * 1024;
/// Requests a new [`Compositor`] with the given [`Settings`].
///
/// Returns `None` if no compatible graphics adapter could be found.
pub async fn request<W: HasRawWindowHandle>(
settings: Settings,
compatible_window: Option<&W>,
) -> Option<Self> {
let instance = wgpu::Instance::new(settings.internal_backend);
#[allow(unsafe_code)]
let compatible_surface = compatible_window
.map(|window| unsafe { instance.create_surface(window) });
let adapter = instance
.request_adapter(&wgpu::RequestAdapterOptions {
power_preference: if settings.antialiasing.is_none() {
wgpu::PowerPreference::LowPower
} else {
wgpu::PowerPreference::HighPerformance
},
compatible_surface: compatible_surface.as_ref(),
})
.await?;
let format = compatible_surface
.as_ref()
.and_then(|surface| surface.get_preferred_format(&adapter))?;
let (device, queue) = adapter
.request_device(
&wgpu::DeviceDescriptor {
label: Some(
"iced_wgpu::window::compositor device descriptor",
),
features: wgpu::Features::empty(),
limits: wgpu::Limits {
max_bind_groups: 2,
..wgpu::Limits::default()
},
},
None,
)
.await
.ok()?;
let staging_belt = wgpu::util::StagingBelt::new(Self::CHUNK_SIZE);
let local_pool = futures::executor::LocalPool::new();
Some(Compositor {
instance,
settings,
device,
queue,
staging_belt,
local_pool,
format,
})
}
/// Creates a new rendering [`Backend`] for this [`Compositor`].
pub fn create_backend(&self) -> Backend {
Backend::new(&self.device, self.settings, self.format)
}
}
impl iced_graphics::window::Compositor for Compositor {
type Settings = Settings;
type Renderer = Renderer;
type Surface = wgpu::Surface;
fn new<W: HasRawWindowHandle>(
settings: Self::Settings,
compatible_window: Option<&W>,
) -> Result<(Self, Renderer), Error> {
let compositor = futures::executor::block_on(Self::request(
settings,
compatible_window,
))
.ok_or(Error::AdapterNotFound)?;
let backend = compositor.create_backend();
Ok((compositor, Renderer::new(backend)))
}
fn create_surface<W: HasRawWindowHandle>(
&mut self,
window: &W,
) -> wgpu::Surface {
#[allow(unsafe_code)]
unsafe {
self.instance.create_surface(window)
}
}
fn configure_surface(
&mut self,
surface: &mut Self::Surface,
width: u32,
height: u32,
) {
surface.configure(
&self.device,
&wgpu::SurfaceConfiguration {
usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
format: self.format,
present_mode: self.settings.present_mode,
width,
height,
},
);
}
fn draw<T: AsRef<str>>(
&mut self,
renderer: &mut Self::Renderer,
surface: &mut Self::Surface,
viewport: &Viewport,
background_color: Color,
output: &<Self::Renderer as iced_native::Renderer>::Output,
overlay: &[T],
) -> Result<mouse::Interaction, iced_graphics::window::SurfaceError> {
match surface.get_current_frame() {
Ok(frame) => {
let mut encoder = self.device.create_command_encoder(
&wgpu::CommandEncoderDescriptor {
label: Some("iced_wgpu encoder"),
},
);
let view = &frame
.output
.texture
.create_view(&wgpu::TextureViewDescriptor::default());
let _ =
encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
label: Some(
"iced_wgpu::window::Compositor render pass",
),
color_attachments: &[wgpu::RenderPassColorAttachment {
view,
resolve_target: None,
ops: wgpu::Operations {
load: wgpu::LoadOp::Clear({
let [r, g, b, a] =
background_color.into_linear();
wgpu::Color {
r: f64::from(r),
g: f64::from(g),
b: f64::from(b),
a: f64::from(a),
}
}),
store: true,
},
}],
depth_stencil_attachment: None,
});
let mouse_interaction = renderer.backend_mut().draw(
&mut self.device,
&mut self.staging_belt,
&mut encoder,
view,
viewport,
output,
overlay,
);
// Submit work
self.staging_belt.finish();
self.queue.submit(Some(encoder.finish()));
// Recall staging buffers
self.local_pool
.spawner()
.spawn(self.staging_belt.recall())
.expect("Recall staging belt");
self.local_pool.run_until_stalled();
Ok(mouse_interaction)
}
Err(error) => match error {
wgpu::SurfaceError::Timeout => {
Err(iced_graphics::window::SurfaceError::Timeout)
}
wgpu::SurfaceError::Outdated => {
Err(iced_graphics::window::SurfaceError::Outdated)
}
wgpu::SurfaceError::Lost => {
Err(iced_graphics::window::SurfaceError::Lost)
}
wgpu::SurfaceError::OutOfMemory => {
Err(iced_graphics::window::SurfaceError::OutOfMemory)
}
},
}
}
}
|
