> For the complete documentation index, see [llms.txt](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/phases/phase_35/session_04_renderer_robustness_and_scheduling.md).

# Session 04: Renderer Robustness And Scheduling

**Session ID**: `phase35-session04-renderer-robustness-and-scheduling` **Status**: Not Started **Estimated Tasks**: \~12-25 **Estimated Duration**: 2-4 hours

***

## Objective

Reduce AI Rogue runtime jank and platform-failure risk in renderer, resize, media-query, WebGL, Pixi asset, and audio paths.

***

## Scope

### In Scope (MVP)

* Coalesce ResizeObserver and window resize callbacks into one measured render pass per frame or an equivalent bounded scheduling path.
* Harden reduced-motion setup for throwing `matchMedia`, legacy `addListener`-only media queries, and unavailable subscription APIs.
* Verify render projection cache invalidation and sprite lifecycle behavior still hold after scheduler changes.
* Add tests or harnesses for WebGL/Pixi init failure, Pixi asset load failure, missing `AudioContext`, failed audio decode, audio dispose, and silent fallback behavior where feasible.

### Out of Scope

* WebGPU support.
* Worker protocols or hosted runtime rendering.
* New audio behavior beyond fallback and lifecycle hardening.

***

## Prerequisites

* [ ] Session 02 sprite-pool and assistive-surface coverage is in place or recorded as current evidence.

***

## Deliverables

1. Renderer scheduling and browser-subscription changes for remaining AR-D4-003 and AR-D7-001 risk.
2. Focused tests for renderer, audio, and platform-failure paths identified in AR-D8-002.
3. Updated evidence for render-cache reuse, invalidation, and lifecycle clears.

***

## Success Criteria

* [ ] Resize storms do not trigger unbounded immediate resize/render work.
* [ ] Reduced-motion probing cannot fail the runtime mount by itself.
* [ ] WebGL, Pixi asset, and audio failures produce visible or silent fallback states instead of uncaught setup failures.
* [ ] Renderer and audio focused tests pass with existing e2e route cleanup.

## Folded Audit Detail Routed To This Session

### Finding IDs Owned

* AR-D4-003: ResizeObserver and window resize historically called full resize/render work immediately with no RAF coalescing or debounce.
* AR-D7-001: reduced-motion media query setup historically used direct `matchMedia` and `addEventListener` calls that could fail the mount.
* AR-D8-002: renderer, audio, and platform-failure coverage is source-inspection-heavy.
* Medium-priority coverage gaps: resize coalescing, throwing `matchMedia`, addListener-only media queries, WebGL/Pixi init failure, failed Pixi asset load, unavailable `AudioContext`, failed decode, audio dispose, and blocked/quota IndexedDB where feasible.

### Source Locations From Audit

* `src/extensions/ai-rogue/runtime/renderer.ts:634`: resize callback path.
* `src/extensions/ai-rogue/runtime/renderer.ts:1581`: reduced-motion sync path.
* `src/extensions/ai-rogue/runtime/__tests__/assets.test.ts:1`: current asset coverage anchor.
* Renderer module split row: controller/state machine, command adapter, render scheduler, Pixi resource/sprite pool, browser subscriptions, audio adapter, inspect overlay, and save-payload adapter.

### Robustness Contracts

* Resize storms should result in bounded render work, ideally one measured pass per frame.
* Reduced-motion probing should degrade to no-op cleanup when media queries are unavailable, throwing, or legacy-only.
* WebGL/Pixi and asset failures should surface controlled recovery states.
* Audio failures should stay silent/fallback-safe and dispose cleanly.

### Acceptance Evidence Required

* [ ] Coalescing test proves resize/render call bounds.
* [ ] Media-query fallback tests cover throwing `matchMedia` and `addListener`-only objects.
* [ ] WebGL/Pixi asset failure tests or documented harness evidence exists.
* [ ] Audio fallback and dispose tests cover missing context and decode failure.


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