rendering: separate retained render planning from execution - #61
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Purpose
Introduce the private render-plan boundary between retained semantic commands and backend execution ordering. This is implementation architecture only; it does not expand the public Coin API.
V1
SoRenderPlanfrom the retainedSoDrawList.SoDrawListimmutable during planning.The semantic IR and DrawList execution-order cleanup (
pass,sortKey, and DrawList-owned sorted-order helpers) belongs to PR #28. This layer consumes that simpler insertion-ordered representation.Deferred
Material/opacity semantics and transparency scheduling are layered in PR #49; additional stages, batching, OIT, and a public planner API remain future work.