tawasuyu

tawasuyu/llimphi

Sovereign retained-mode GPU UI framework in Rust (wgpu+vello+taffy+parley), Elm loop, 40+ widgets.

Rust 614Markdown 274TOML 149RON 310606 Definiciones

⎇ main llimphi-surface/README.md Markdown · 35 líneas · 1.5 KB Historia crudo

chore: refresco desde el monorepo — 27 crates nuevos (anim, lottie, svg, mesh, image, layer, test, wire-view, widgets rag-sidebar/router/lazy-list/rive-button) y sync de los 95 existentes 93253cc22 · Sergio · 

1# llimphi-surface
2
3External surfaces inside the Elm loop.
4
5An `ExternalSurface` is an RGBA8 texture living on the GPU, painted over a rect
6of the Llimphi frame every time the app exposes it through
7`View::gpu_paint_with`. The byte source runs outside the Elm loop: a video
8decoder, a camera capture, a PDF raster, a raw texture produced by another engine
9— any producer generating RGBA can push frames with `ExternalSurface::upload` and
10see the result on the next raster pass.
11
12The crate provides:
13
14- `ExternalSurface`: owner of the texture + render pipeline + bind group.
15  `upload(rgba, w, h)` uploads bytes and recreates the texture if `w`/`h` changed.
16- `ExternalSurface::view`: a helper that builds a `View` with `gpu_paint_with`
17  already wired. The app only chooses the node's `Style` (which portion of the
18  layout it occupies).
19
20## Design
21
22The pipeline is a classic textured quad: two triangles cover the destination
23rect, and the fragment shader samples the external texture with a bilinear
24sampler. The quad's NDC coordinates are computed on the GPU from
25`(rect, viewport)` travelling through a uniform — which is why the callback needs
26the `viewport` that `llimphi-ui` began propagating in `GpuPaintFn`.
27
28The intermediate texture Llimphi paints vello into is `Rgba8Unorm` (see
29`llimphi-hal::INTERMEDIATE_FORMAT`). The pipeline emits `Rgba8Unorm` too — the
30render pass target is that same intermediate with `LoadOp::Load`, so the vello
31background is preserved.
32
33---
34
35Part of **llimphi** — see [llimphi](../README.md).

README.md

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:

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.