Runtime.Graphics.RenderGraph (Visera.Runtime.Graphics.RenderGraph)

Render graph: declarative passes and resource dependencies. Drives frame rendering. Pass execution receives a pass context (command list and render list); compile produces an executable that runs against FRenderContext.

FRDGPassContext

Per-pass execution context passed to each pass’s execute lambda.

Member	Type	Description
CommandList	FRHICommandList&	Command list for this frame.
RenderList	const FRenderList&	Sorted batches (opaque/transparent); draw passes iterate this.

FRenderGraph

• AddPass(I_Name, I_Setup, I_Execute) — Adds a pass. I_Name is FName (e.g. EName::PresentTransition). Setup lambda configures reads/writes; execute lambda receives FRDGPassContext (command list + render list).
• Compile(I_RHI) — Builds barriers and order; returns an executable.
• Execute(I_RenderContext) — Creates a command list from I_RenderContext->RHI, runs all passes with FRenderContext (including RenderList), then submits the command list. Requires I_RenderContext->RenderList to be non-null.

Swap chain is identified by FRHISwapChainID (no separate type alias).

CullDeadPasses

Dead pass culling: removes passes whose outputs are never consumed by any live pass. Algorithm is O(N+E) reverse BFS (replacing the previous O(N³) fixed-point iteration):

1. Build a ResourceWriters map (resource → node indices that write it).
2. Seed the alive set with nodes that write to external resources (back buffer, cached textures).
3. BFS backwards: for each alive node’s reads, mark all writers of that resource alive. Passes not reached are removed.

See also

• Graphics — parent module
• Framework — FRenderContext and FRenderList
• Scene — scene data
• RHI — command list and resources