Struct ExternalExtents 

pub struct ExternalExtents { /* private fields */ }

The texel extent of every externally bound texture, keyed by the opaque id a Command::SceneTexture names it by.

A projection of the renderer’s own registry, maintained by the one call that owns both halves (EngineRenderer::bind_texture/unbind_texture), so the two can never disagree about which ids are live. Only the extent crosses over: the view stays on the GPU side, which is what keeps compile free of wgpu.

A compiler built standalone starts empty, which reads as “nothing is bound” — every SceneTexture then draws nothing, exactly as an unregistered id does.

Implementations

impl ExternalExtents

pub fn new() -> Self

An empty map — nothing bound.

pub fn bind(&mut self, id: u64, size: (u32, u32)) -> bool

Records id as bound at size texels, returning whether the extent is usable at all.

A dimension past u16::MAX is refused rather than truncated: the record the shader reads packs the source region into u16 halves, so a truncated extent would sample a rectangle the caller never named. A zero dimension is refused for the same reason a zero-sized image is — there is no scale to map it onto dest with.

pub fn unbind(&mut self, id: u64)

Forgets id, if it was bound.

pub fn get(&self, id: u64) -> Option<(u16, u16)>

The texel extent bound under id, if any.

pub fn len(&self) -> usize

How many textures are bound.

pub fn is_empty(&self) -> bool

Whether nothing is bound.

Trait Implementations

impl Debug for ExternalExtents

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

Formats the value using the given formatter.

impl Default for ExternalExtents

fn default() -> Self

Returns the “default value” for a type.