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use super::DescriptorSetAllocator;
use crossbeam_channel::{Receiver, Sender};
use rafx_api::{RafxDeviceContext, RafxResult};
use std::collections::VecDeque;
use std::ops::{Deref, DerefMut};
use std::sync::atomic::{AtomicU64, Ordering};
use std::sync::{Arc, Mutex};
struct DescriptorSetAllocatorRefInner {
allocator: Box<DescriptorSetAllocator>,
checkout_frame: u64,
}
pub struct DescriptorSetAllocatorRef {
allocator: Option<DescriptorSetAllocatorRefInner>,
drop_tx: Sender<DescriptorSetAllocatorRefInner>,
}
impl DescriptorSetAllocatorRef {
fn new(
allocator: DescriptorSetAllocatorRefInner,
drop_tx: Sender<DescriptorSetAllocatorRefInner>,
) -> Self {
DescriptorSetAllocatorRef {
allocator: Some(allocator),
drop_tx,
}
}
}
impl Deref for DescriptorSetAllocatorRef {
type Target = DescriptorSetAllocator;
fn deref(&self) -> &Self::Target {
&self.allocator.as_ref().unwrap().allocator
}
}
impl DerefMut for DescriptorSetAllocatorRef {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.allocator.as_mut().unwrap().allocator
}
}
impl Drop for DescriptorSetAllocatorRef {
fn drop(&mut self) {
let mut allocator = self.allocator.take().unwrap();
allocator.allocator.flush_changes().unwrap();
self.drop_tx.send(allocator).unwrap();
}
}
pub struct DescriptorSetAllocatorManagerInner {
device_context: RafxDeviceContext,
allocators: Mutex<VecDeque<Box<DescriptorSetAllocator>>>,
drop_tx: Sender<DescriptorSetAllocatorRefInner>,
drop_rx: Receiver<DescriptorSetAllocatorRefInner>,
frame_index: AtomicU64,
}
impl DescriptorSetAllocatorManagerInner {
fn new(device_context: RafxDeviceContext) -> Self {
let (drop_tx, drop_rx) = crossbeam_channel::unbounded();
DescriptorSetAllocatorManagerInner {
device_context,
allocators: Default::default(),
drop_tx,
drop_rx,
frame_index: AtomicU64::new(0),
}
}
fn drain_drop_rx(
drop_rx: &Receiver<DescriptorSetAllocatorRefInner>,
allocators: &mut VecDeque<Box<DescriptorSetAllocator>>,
frame_index: u64,
) {
for mut allocator in drop_rx.try_iter() {
if allocator.checkout_frame < frame_index {
allocator.allocator.on_frame_complete();
}
if frame_index - allocator.checkout_frame > 1 {
log::warn!("A DescriptorSetAllocatorRef was held for more than one frame.");
}
allocators.push_back(allocator.allocator);
}
}
pub fn get_allocator(&self) -> DescriptorSetAllocatorRef {
let frame_index = self.frame_index.load(Ordering::Relaxed);
let allocator = {
let mut allocators = self.allocators.lock().unwrap();
Self::drain_drop_rx(&self.drop_rx, &mut *allocators, frame_index);
allocators
.pop_front()
.map(|allocator| DescriptorSetAllocatorRefInner {
allocator,
checkout_frame: frame_index,
})
};
let allocator = allocator.unwrap_or_else(|| {
let allocator = Box::new(DescriptorSetAllocator::new(&self.device_context));
DescriptorSetAllocatorRefInner {
allocator,
checkout_frame: frame_index,
}
});
DescriptorSetAllocatorRef::new(allocator, self.drop_tx.clone())
}
pub fn on_frame_complete(&self) {
let frame_index = self.frame_index.fetch_add(1, Ordering::Relaxed);
let mut allocators = self.allocators.lock().unwrap();
Self::drain_drop_rx(&self.drop_rx, &mut *allocators, frame_index);
for allocator in allocators.iter_mut() {
allocator.on_frame_complete();
}
}
fn destroy(&self) -> RafxResult<()> {
let frame_index = self.frame_index.load(Ordering::Relaxed);
let mut allocators = self.allocators.lock().unwrap();
Self::drain_drop_rx(&self.drop_rx, &mut *allocators, frame_index);
for mut allocator in allocators.drain(..).into_iter() {
allocator.destroy()?;
}
Ok(())
}
}
pub struct DescriptorSetAllocatorProvider {
inner: Arc<DescriptorSetAllocatorManagerInner>,
}
impl DescriptorSetAllocatorProvider {
pub fn get_allocator(&self) -> DescriptorSetAllocatorRef {
self.inner.get_allocator()
}
}
pub struct DescriptorSetAllocatorManager {
inner: Arc<DescriptorSetAllocatorManagerInner>,
}
impl DescriptorSetAllocatorManager {
pub fn new(device_context: &RafxDeviceContext) -> Self {
DescriptorSetAllocatorManager {
inner: Arc::new(DescriptorSetAllocatorManagerInner::new(
device_context.clone(),
)),
}
}
pub fn create_allocator_provider(&self) -> DescriptorSetAllocatorProvider {
DescriptorSetAllocatorProvider {
inner: self.inner.clone(),
}
}
pub fn get_allocator(&self) -> DescriptorSetAllocatorRef {
self.inner.get_allocator()
}
#[profiling::function]
pub fn on_frame_complete(&self) {
self.inner.on_frame_complete();
}
pub fn destroy(&mut self) -> RafxResult<()> {
self.inner.destroy()
}
}