Sergio
93253cc227
Regenerado con scripts/actualizar-standalone.py --llimphi. Vendoriza además
shared/{foreign-lottie,grafo}. Quedan fuera los crates acoplados al workspace
madre (wasm-*, video-plane, voxel-app/studio, allichay, plugin-host, shuma-term).
cargo check --workspace verde (112 miembros).
1.5 KiB
llimphi-surface
External surfaces inside the Elm loop.
An ExternalSurface is an RGBA8 texture living on the GPU, painted over a rect
of the Llimphi frame every time the app exposes it through
View::gpu_paint_with. The byte source runs outside the Elm loop: a video
decoder, a camera capture, a PDF raster, a raw texture produced by another engine
— any producer generating RGBA can push frames with ExternalSurface::upload and
see the result on the next raster pass.
The crate provides:
ExternalSurface: owner of the texture + render pipeline + bind group.upload(rgba, w, h)uploads bytes and recreates the texture ifw/hchanged.ExternalSurface::view: a helper that builds aViewwithgpu_paint_withalready wired. The app only chooses the node'sStyle(which portion of the layout it occupies).
Design
The pipeline is a classic textured quad: two triangles cover the destination
rect, and the fragment shader samples the external texture with a bilinear
sampler. The quad's NDC coordinates are computed on the GPU from
(rect, viewport) travelling through a uniform — which is why the callback needs
the viewport that llimphi-ui began propagating in GpuPaintFn.
The intermediate texture Llimphi paints vello into is Rgba8Unorm (see
llimphi-hal::INTERMEDIATE_FORMAT). The pipeline emits Rgba8Unorm too — the
render pass target is that same intermediate with LoadOp::Load, so the vello
background is preserved.
Part of llimphi — see llimphi.