Function execute 

pub fn execute<H>(
    ctx: &mut <H as Hal>::Context,
    surface: &mut <H as Hal>::Texture,
    recording: &Recording,
    images: &[&<H as Hal>::Texture],
) -> Result<(), Error>
where
    H: Hal,
    <H as Hal>::Context: HalContext<Hal = H>,

Draw a recording into a texture this crate did not create.

Context::draw covers the case where the target came from Context::create_surface, and that is the ordinary one. This is the other: a swapchain hands out its own images, and drawing into one means naming a texture the caller got from somewhere else. Without this the presentation path re-exported above reached a swapchain and then had nothing to draw into its images with, which is a window a caller can open and not fill. Render every pass of a recording, layers first, root into the surface.

images are the caller’s own textures, addressed by the slot a paint named.

Layer targets are allocated per call and released before returning. Pooling them was assumed to be worth doing and is not: creating and destroying a 512x512 target measures 0.6 microseconds against 53 for the submission that draws into it, so a pool would save under two percent of what a pass costs and would owe an invalidation rule in exchange.