fluent-gpu / src

The engine code. Design lives in ../design; this is the scaffold + the minimum vertical slice that is the architecture's acceptance test.

Solution layout (FluentGpu.slnx, solution folders)

• Core — Foundation · Scene · Layout · Render · Dsl · Hooks · Reconciler · Input · Animation · Hosting
• Seams (interface-only) — Rhi · Pal · Text
• Backends.Windows (the reference D3D12 path — scaffold) — Win32.Interop · Rhi.D3D12 · Pal.Windows · Text.DirectWrite · Accessibility.Uia
• Backends.Headless (the CPU test path — real) — Rhi.Headless · Pal.Headless · Text.Headless
• Tooling (Roslyn analyzers/generators) — SourceGen (one netstandard2.0 assembly: the Localization/ loc-keys + Validation/ [Validatable] generators, plus the engine-DSL/Theme + COM-binding scaffolds)
• Apps — VerticalSlice

Solution filters (.slnf)

• FluentGpu.Slice.slnf — the headless slice closure (no Windows leaves, no analyzers). Builds + runs without a GPU.
• FluentGpu.Windows.slnf — the Windows-backend closure (for implementing the D3D12/DWrite/UIA path).

Build & run

dotnet build FluentGpu.slnx                 # whole solution
dotnet build FluentGpu.Slice.slnf           # just the runnable headless slice
dotnet run  --project FluentGpu.VerticalSlice

The slice runs the full 13-phase frame loop on the headless RHI/PAL/Text backends and asserts, end to end: window → GPU clear → rounded-rect → text → flex layout → reconciler + UseState → clickable Button (Count 0→1 on click), plus zero managed allocation on the paint half (phases 6–11) — the architecture's acceptance test.

Status: the portable core is real; the slice runs on the headless backends. The Windows D3D12/DWrite/UIA leaves and the source generators are scaffolded (see each project's Placeholder.cs) — the next code milestone is the real D3D12 backend so the same Counter renders to an actual window. Baseline: net10.0, C# 14, AOT-compatible (Directory.Build.props).