Struct AsyncReadback

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pub struct AsyncReadback { /* private fields */ }

Expand description

A pending GPU→CPU readback. Created by AsyncReadback::from_texture_layer. Call AsyncReadback::try_collect each frame (after a non-blocking device poll) until it returns Ok(data).

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impl AsyncReadback

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pub fn from_texture_layer( instance: &RenderInstanceData<'_>, texture: &Texture, layer: u32, ) -> Self

Copy one layer of a texture array into a fresh staging buffer and start an async mapping. The GPU copy and the mapping are both non-blocking — the caller must poll the device (e.g. PollType::Poll) and call try_collect in a later frame.

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pub fn try_collect(self) -> Result<Vec<u8>, Self>

Try to collect the result. Returns Ok(data) when the GPU has finished, or Err(self) when the mapping is still in progress (call again next frame). Call instance.device.poll(PollType::Poll) before this to process GPU callbacks.

Trait Implementations§

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impl Send for AsyncReadback

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impl Sync for AsyncReadback

Auto Trait Implementations§

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impl !UnwindSafe for AsyncReadback

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Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.

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