Struct SourceGroupCache 

pub struct SourceGroupCache<G = BindGroup> { /* private fields */ }

Bind groups that name a pooled or retained page, kept across frames.

A page-round resources group, a composite or backdrop segment’s group and a filter pass’s source group each name one texture view; rebuilding them for the same view every frame is pure cost. Entries are keyed by what they sample (SourceGroupKey) and swept every frame: Self::sweep drops every entry the frame did not use, so a group never keeps a texture alive past the frame after the last one that drew with it — well inside the page pool’s own keep-alive window, which has no eviction hook to invalidate against. The owner clears the cache outright when an input every entry shares (the coverage view) is recreated.

Generic over the group type so the keying and sweep rules test without a device.

Implementations

impl<G: Clone> SourceGroupCache<G>

pub fn get_or_build( &mut self, key: SourceGroupKey, build: impl FnOnce() -> G, ) -> G

The group under key, built by build on a miss. Marks it used.

pub fn sweep(&mut self)

Ends a frame: drops every entry the frame did not use and marks the survivors unused for the next one.

pub fn clear(&mut self)

Drops every entry.

pub fn created(&self) -> u64

How many groups this cache has built, over its life.

pub fn len(&self) -> usize

How many entries it holds right now.

pub fn is_empty(&self) -> bool

Whether it holds none.

Trait Implementations

impl<G: Debug> Debug for SourceGroupCache<G>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<G> Default for SourceGroupCache<G>

fn default() -> Self

Returns the “default value” for a type.