Rendering quality roadmap: layered PBR and renderer foundations

[proggeramlug]

Status

Draft cumulative rendering-quality branch. The branch is intentionally kept reviewable and recoverable while the remaining roadmap work is completed.

Included so far

• layered glTF PBR material import and rendering paths
• compiled render-graph, quality-capture, and regression infrastructure
• material texture indirection and GPU-driven retained rendering foundations
• transparency, refraction, reactive coverage, transmitted shadows, and virtual-shadow work
• iridescence-aware SSR metadata transport with ordinary paths kept lazy
• solid-angle/PDF-selected HDR environment prefiltering to remove thin-film fireflies
• merged compatibility with PRs fix: unblock main CI + audit follow-ups (RT-safety, silent-drop FFI, docs) #124, feat(apple): gamepad on macOS/iOS + iOS AVAudioSession #125, and fix(linux): make Bloom actually run on Linux — device limits, screenshots, window close #146

Latest qualification

• shared library: 260 passed, 0 failed, 1 ignored
• macOS Metal renderer-test release build succeeds
• exact Damaged Helmet A/B: SSIM 0.98803, luminance RMSE 0.01653 (pass)
• final iridescence capture removes clustered HDR fireflies without a material-specific mip bias
• ordinary steady-state rendering has no new per-frame pass or CPU work; HDR pyramid preparation is load-time only

Remaining before ready

• finish public API/debug/transport parity and closure evidence for the active layered-PBR issue
• complete cross-target qualification
• resolve the cumulative branch file-size gate debt

This draft does not auto-close the remaining roadmap issues yet.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/rendering-wip-integrated-20260727

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