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use crate::{error::EnvironmentError, types::*};
use anyhow::{Error, Result};
use hal::queue::family::QueueFamilyId;
use std::{
any::TypeId,
collections::HashMap,
sync::{Arc, RwLock},
};
/// Used to find appropriate queue families and share queues from them as needed.
pub struct QueueNegotiator {
family_ids: HashMap<TypeId, QueueFamilyId>,
already_allocated: HashMap<TypeId, (Vec<Arc<RwLock<QueueT>>>, usize)>,
}
/// Can be used to select a specific queue family
pub trait QueueFamilySelector: 'static {
/// Check if the given family is suitable
fn is_suitable(&self, family: &QueueFamilyT) -> bool;
}
impl QueueNegotiator {
pub fn new() -> Self {
QueueNegotiator {
family_ids: HashMap::new(),
already_allocated: HashMap::new(),
}
}
pub fn find<T: QueueFamilySelector>(&mut self, adapter: &Adapter, filter: &T) -> Result<()> {
if self.family_ids.contains_key(&TypeId::of::<T>()) {
return Ok(());
}
let candidates: Vec<&QueueFamilyT> = adapter
.queue_families
.iter()
.filter(|x| filter.is_suitable(*x))
.collect();
if candidates.is_empty() {
return Err(Error::new(EnvironmentError::NoSuitableFamilies));
}
// Prefer using unique families
let family = match candidates
.iter()
.find(|x| !self.family_ids.values().any(|y| *y == x.id()))
{
Some(x) => *x,
None => candidates[0],
};
self.family_ids.insert(TypeId::of::<T>(), family.id());
Ok(())
}
pub fn get_queue<T: QueueFamilySelector>(
&mut self,
groups: &mut Vec<QueueGroup>,
) -> Option<Arc<RwLock<QueueT>>> {
let tid = TypeId::of::<T>();
let family_id = self.family_ids.get(&tid)?;
match groups
.iter()
.position(|x| !x.queues.is_empty() && x.family == *family_id)
{
Some(idx) => {
// At least one remaining queue
let queue = groups[idx].queues.pop().unwrap();
let queue = Arc::new(RwLock::new(queue));
self.add_to_allocated::<T>(queue.clone());
Some(queue)
}
None => match self.already_allocated.get_mut(&tid) {
Some((queues, next_share)) => {
let queue = (&queues[*next_share]).clone();
*next_share += 1;
Some(queue)
}
None => None,
},
}
}
pub fn family<T: QueueFamilySelector>(&self) -> Option<QueueFamilyId> {
self.family_ids.get(&TypeId::of::<T>()).cloned()
}
fn add_to_allocated<T: QueueFamilySelector>(&mut self, queue: Arc<RwLock<QueueT>>) {
let tid = TypeId::of::<T>();
match self.already_allocated.get_mut(&tid) {
None => {
self.already_allocated.insert(tid, (vec![queue], 0));
}
Some(x) => {
x.0.push(queue);
}
}
}
pub fn family_spec<'a, T: QueueFamilySelector>(
&self,
queue_families: &'a Vec<QueueFamilyT>,
count: usize,
) -> Option<(&'a QueueFamilyT, Vec<f32>)> {
let qf_id = self.family::<T>()?;
let qf = queue_families.iter().find(|x| x.id() == qf_id)?;
let v = vec![1.0; count];
Some((qf, v))
}
}
pub struct DrawQueue {
pub surface: SurfaceT,
}
impl QueueFamilySelector for DrawQueue {
fn is_suitable(&self, family: &QueueFamilyT) -> bool {
self.surface.supports_queue_family(family) && family.queue_type().supports_graphics()
}
}
|
