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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use super::{PendingTransition, ResourceState, Unit};
use crate::{
id::{BufferId, Valid},
resource::BufferUse,
};
//TODO: store `hal::buffer::State` here to avoid extra conversions
pub(crate) type BufferState = Unit<BufferUse>;
impl PendingTransition<BufferState> {
fn collapse(self) -> Result<BufferUse, Self> {
if self.usage.start.is_empty()
|| self.usage.start == self.usage.end
|| !BufferUse::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 {
Self {
first: None,
last: BufferUse::empty(),
}
}
}
impl BufferState {
pub fn with_usage(usage: BufferUse) -> Self {
Unit::new(usage)
}
}
impl ResourceState for BufferState {
type Id = BufferId;
type Selector = ();
type Usage = BufferUse;
fn query(&self, _selector: Self::Selector) -> Option<Self::Usage> {
Some(self.last)
}
fn change(
&mut self,
id: Valid<Self::Id>,
_selector: Self::Selector,
usage: Self::Usage,
output: Option<&mut Vec<PendingTransition<Self>>>,
) -> Result<(), PendingTransition<Self>> {
let old = self.last;
if old != usage || !BufferUse::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 prepend(
&mut self,
id: Valid<Self::Id>,
_selector: Self::Selector,
usage: Self::Usage,
) -> Result<(), PendingTransition<Self>> {
match self.first {
Some(old) if old != usage => Err(PendingTransition {
id,
selector: (),
usage: old..usage,
}),
_ => {
self.first = Some(usage);
Ok(())
}
}
}
fn merge(
&mut self,
id: Valid<Self::Id>,
other: &Self,
output: Option<&mut Vec<PendingTransition<Self>>>,
) -> Result<(), PendingTransition<Self>> {
let old = self.last;
let new = other.port();
if old == new && BufferUse::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: BufferUse::INDEX,
};
let id = Id::dummy();
assert_eq!(
bs.change(id, (), BufferUse::STORAGE_STORE, None),
Err(PendingTransition {
id,
selector: (),
usage: BufferUse::INDEX..BufferUse::STORAGE_STORE,
}),
);
bs.change(id, (), BufferUse::VERTEX, None).unwrap();
bs.change(id, (), BufferUse::INDEX, None).unwrap();
assert_eq!(bs, Unit::new(BufferUse::VERTEX | BufferUse::INDEX));
}
#[test]
fn change_replace() {
let mut bs = Unit {
first: None,
last: BufferUse::STORAGE_STORE,
};
let id = Id::dummy();
let mut list = Vec::new();
bs.change(id, (), BufferUse::VERTEX, Some(&mut list))
.unwrap();
assert_eq!(
&list,
&[PendingTransition {
id,
selector: (),
usage: BufferUse::STORAGE_STORE..BufferUse::VERTEX,
}],
);
assert_eq!(
bs,
Unit {
first: Some(BufferUse::STORAGE_STORE),
last: BufferUse::VERTEX,
}
);
list.clear();
bs.change(id, (), BufferUse::STORAGE_STORE, Some(&mut list))
.unwrap();
assert_eq!(
&list,
&[PendingTransition {
id,
selector: (),
usage: BufferUse::VERTEX..BufferUse::STORAGE_STORE,
}],
);
assert_eq!(
bs,
Unit {
first: Some(BufferUse::STORAGE_STORE),
last: BufferUse::STORAGE_STORE,
}
);
}
#[test]
fn prepend() {
let mut bs = Unit {
first: None,
last: BufferUse::VERTEX,
};
let id = Id::dummy();
bs.prepend(id, (), BufferUse::INDEX).unwrap();
bs.prepend(id, (), BufferUse::INDEX).unwrap();
assert_eq!(
bs.prepend(id, (), BufferUse::STORAGE_LOAD),
Err(PendingTransition {
id,
selector: (),
usage: BufferUse::INDEX..BufferUse::STORAGE_LOAD,
})
);
assert_eq!(
bs,
Unit {
first: Some(BufferUse::INDEX),
last: BufferUse::VERTEX,
}
);
}
}
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