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use super::{PendingTransition, ResourceState, Unit};
use crate::id::BufferId;
use wgt::BufferUsage;
pub type BufferState = Unit<BufferUsage>;
impl PendingTransition<BufferState> {
fn collapse(self) -> Result<BufferUsage, Self> {
if self.usage.start.is_empty()
|| self.usage.start == self.usage.end
|| !BufferUsage::WRITE_ALL.intersects(self.usage.start | self.usage.end)
{
Ok(self.usage.start | self.usage.end)
} else {
Err(self)
}
}
}
impl Default for BufferState {
fn default() -> Self {
BufferState {
first: None,
last: BufferUsage::empty(),
}
}
}
impl BufferState {
pub fn with_usage(usage: BufferUsage) -> Self {
Unit::new(usage)
}
}
impl ResourceState for BufferState {
type Id = BufferId;
type Selector = ();
type Usage = BufferUsage;
fn query(&self, _selector: Self::Selector) -> Option<Self::Usage> {
Some(self.last)
}
fn change(
&mut self,
id: Self::Id,
_selector: Self::Selector,
usage: Self::Usage,
output: Option<&mut Vec<PendingTransition<Self>>>,
) -> Result<(), PendingTransition<Self>> {
let old = self.last;
if old != usage || !BufferUsage::ORDERED.contains(usage) {
let pending = PendingTransition {
id,
selector: (),
usage: old..usage,
};
*self = match output {
None => {
assert_eq!(
self.first, None,
"extending a state that is already a transition"
);
Unit::new(pending.collapse()?)
}
Some(transitions) => {
transitions.push(pending);
Unit {
first: self.first.or(Some(old)),
last: usage,
}
}
};
}
Ok(())
}
fn merge(
&mut self,
id: Self::Id,
other: &Self,
output: Option<&mut Vec<PendingTransition<Self>>>,
) -> Result<(), PendingTransition<Self>> {
let old = self.last;
let new = other.port();
if old == new && BufferUsage::ORDERED.contains(new) {
if output.is_some() && self.first.is_none() {
self.first = Some(old);
}
} else {
let pending = PendingTransition {
id,
selector: (),
usage: old..new,
};
*self = match output {
None => {
assert_eq!(
self.first, None,
"extending a state that is already a transition"
);
Unit::new(pending.collapse()?)
}
Some(transitions) => {
transitions.push(pending);
Unit {
first: self.first.or(Some(old)),
last: other.last,
}
}
};
}
Ok(())
}
fn optimize(&mut self) {}
}
#[cfg(test)]
mod test {
use super::*;
use crate::id::Id;
#[test]
fn change_extend() {
let mut bs = Unit {
first: None,
last: BufferUsage::INDEX,
};
let id = Id::default();
assert_eq!(
bs.change(id, (), BufferUsage::STORAGE, None),
Err(PendingTransition {
id,
selector: (),
usage: BufferUsage::INDEX..BufferUsage::STORAGE,
}),
);
bs.change(id, (), BufferUsage::VERTEX, None).unwrap();
bs.change(id, (), BufferUsage::INDEX, None).unwrap();
assert_eq!(bs, Unit::new(BufferUsage::VERTEX | BufferUsage::INDEX));
}
#[test]
fn change_replace() {
let mut bs = Unit {
first: None,
last: BufferUsage::STORAGE,
};
let id = Id::default();
let mut list = Vec::new();
bs.change(id, (), BufferUsage::VERTEX, Some(&mut list))
.unwrap();
assert_eq!(
&list,
&[PendingTransition {
id,
selector: (),
usage: BufferUsage::STORAGE..BufferUsage::VERTEX,
}],
);
assert_eq!(
bs,
Unit {
first: Some(BufferUsage::STORAGE),
last: BufferUsage::VERTEX,
}
);
list.clear();
bs.change(id, (), BufferUsage::STORAGE, Some(&mut list))
.unwrap();
assert_eq!(
&list,
&[PendingTransition {
id,
selector: (),
usage: BufferUsage::VERTEX..BufferUsage::STORAGE,
}],
);
assert_eq!(
bs,
Unit {
first: Some(BufferUsage::STORAGE),
last: BufferUsage::STORAGE,
}
);
}
}