GlHost (FS-Skia-UI) | FS-Skia-UI

GlHost Module

Namespace: FS.Skia.UI.SkiaViewer.Host
Assembly: FS.Skia.UI.SkiaViewer.dll

The OpenGL/Skia presentation host body (internal helpers hidden; only `run` is reachable).

Types

Type	Description
PresentAction

Functions and values

Function or value	Description
`lastPresentTiming ()` Full Usage: `lastPresentTiming ()` Parameters: () : `unit` Returns: `TimeSpan * TimeSpan`	Feature 120 (US1, FR-001/002): the most recent present's per-phase durations — the scene→canvas paint walk and the flush + buffer-swap (compose). Live-only, non-golden; consumed by the interactive adapter's `FrameMetrics.PaintDuration`/`ComposeDuration` and the timing baseline. () : `unit` Returns: `TimeSpan * TimeSpan`
`planPresent prev next sizeChanged idleRepresentsRemaining` Full Usage: `planPresent prev next sizeChanged idleRepresentsRemaining` Parameters: prev : `Scene option` next : `Scene` sizeChanged : `bool` idleRepresentsRemaining : `int` Returns: `PresentAction`	Feature 122 (FR-001/002): the pure present decision. `PaintAndPresent` when `shouldPresent`; otherwise `RepresentLastGood` while `idleRepresentsRemaining > 0` (buffers may still be undrawn), else `SkipPresent` (full idle). Keeping every swapchain buffer populated stops a multi-buffer compositor (Wayland windowed-fullscreen) from rotating an undrawn black buffer into view. Exposed for the present-plan transition test (T011). prev : `Scene option` next : `Scene` sizeChanged : `bool` idleRepresentsRemaining : `int` Returns: `PresentAction`
`run program` Full Usage: `run program` Parameters: program : `ViewerProgram<'model, 'msg>` Returns: `Result<unit, RenderDiagnostic>` Type parameters: 'model, 'msg	Public contract function exposed by this FS.Skia.UI package. Signature shape preserved from the former VulkanHost.run so Host/Viewer.fs routes unchanged. program : `ViewerProgram<'model, 'msg>` Returns: `Result<unit, RenderDiagnostic>`
`shouldAdvanceFrame lastFrameTime now frameInterval` Full Usage: `shouldAdvanceFrame lastFrameTime now frameInterval` Parameters: lastFrameTime : `float` now : `float` frameInterval : `float` Returns: `bool`	Feature 121 (US1, FR-002): pure frame-pacing decision — advance (update + present) iff at least `frameInterval` seconds elapsed since the last advance. Gates DoUpdate AND DoRender so the `ViewerOptions.FrameRateCap` bounds render cadence. Exposed for the pacing test (T006). lastFrameTime : `float` now : `float` frameInterval : `float` Returns: `bool`
`shouldPresent prev next sizeChanged` Full Usage: `shouldPresent prev next sizeChanged` Parameters: prev : `Scene option` next : `Scene` sizeChanged : `bool` Returns: `bool`	Feature 120 (US2): pure present-or-skip decision (present iff first frame, scene changed, or the framebuffer size changed). Exposed for the idle-skip transition test (T016). prev : `Scene option` next : `Scene` sizeChanged : `bool` Returns: `bool`