Struct TextBindCache 

pub struct TextBindCache { /* private fields */ }

The text-overlay state one draw call would set that the previous call in the same pass already left bound. A heads-up display is overwhelmingly many labels sharing one atlas and one full-window scissor, so tracking the last value bound turns a per-label bind into a per-change bind.

The scissor is the canonical (x, y, w, h) in attachment pixels that clip_rect_to_scissor returns and every backend’s own rect type converts from, so one cache serves all three backends.

A cache starts empty rather than seeded with whatever the pass began with, so the first call of each kind always binds and the cache never has to assume what the surrounding pass left in place.

Both queries record as they answer, so a caller must ask only where it goes on to bind: asking and then skipping the bind desynchronises the cache from the recorder.

Implementations

impl TextBindCache

pub fn new() -> Self

An empty cache: the first query of each kind reports a change.

pub fn atlas_changed(&mut self, idx: usize) -> bool

Whether the atlas at idx still needs binding, recording it as bound.

pub fn scissor_changed(&mut self, rect: (i32, i32, u32, u32)) -> bool

Whether rect still needs setting as the scissor, recording it as set.

Trait Implementations

impl Default for TextBindCache

fn default() -> TextBindCache

Returns the “default value” for a type.