Struct RenderingCache

pub struct RenderingCache<T> { /* private fields */ }

The RenderingCache, in combination with CachedGraphicsData, allows back ends to store data that’s either intensive to compute or has bad CPU locality. Back ends typically keep a RenderingCache instance and use the item’s cached_rendering_data() integer as index in the vec_arena::Arena.

This is used only for the crate::item_rendering::PartialRenderingCache

Implementations

impl<T> RenderingCache<T>

pub fn generation(&self) -> usize

Returns the generation of the cache. The generation starts at 1 and is increased whenever the cache is cleared, for example when the GL context is lost.

pub fn get_mut(&mut self, index: usize) -> Option<&mut CachedGraphicsData<T>>

Retrieves a mutable reference to the cached graphics data at index.

pub fn contains(&self, index: usize) -> bool

Returns true if a cache entry exists for the given index.

pub fn insert(&mut self, data: CachedGraphicsData<T>) -> usize

Inserts data into the cache and returns the index for retrieval later.

pub fn get(&self, index: usize) -> Option<&CachedGraphicsData<T>>

Retrieves an immutable reference to the cached graphics data at index.

pub fn remove(&mut self, index: usize) -> CachedGraphicsData<T>

Removes the cached graphics data at the given index.

pub fn clear(&mut self)

Removes all entries from the cache and increases the cache’s generation count, so that stale index access can be avoided.

Trait Implementations

impl<T> Default for RenderingCache<T>

fn default() -> Self

Returns the “default value” for a type.