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6b7029a05b
- Created sprint-status.yaml to track development status of epics and stories. - Added epics.md detailing the breakdown of functional and non-functional requirements for the project. - Introduced implementation-readiness-report-2026-03-12.md summarizing document inventory, PRD analysis, epic coverage validation, UX alignment assessment, and overall readiness status.
229 lines
17 KiB
Markdown
229 lines
17 KiB
Markdown
# Implementation Readiness Assessment Report
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**Date:** 2026-03-12
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**Project:** Fantasy-Map-Generator
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---
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## Document Inventory
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| Document | File | Status |
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| --------------- | ------------------------------------------------- | ------------------------------------------------------- |
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| PRD | `_bmad-output/planning-artifacts/prd.md` | ✅ Found (whole) |
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| Architecture | `_bmad-output/planning-artifacts/architecture.md` | ✅ Found (whole) |
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| Epics & Stories | `_bmad-output/planning-artifacts/epics.md` | ✅ Found (whole) |
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| UX Design | — | ⚠️ Not found (desktop-first tool, no UX doc — expected) |
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---
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## PRD Analysis
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**Total FRs: 27 (FR1–FR27)**
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**Total NFRs: 17 (NFR-P1–P6, NFR-C1–C4, NFR-M1–M5, NFR-B1–B2)**
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PRD completeness: Complete. All requirements clearly numbered, testable, and scoped to the brownfield WebGL layer framework feature.
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---
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## Epic Coverage Validation
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### FR Coverage Matrix
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| FR | PRD Requirement (summary) | Epic / Story | Status |
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| ---- | ------------------------------------------------------------------ | --------------------------------------- | ---------- |
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| FR1 | Single shared WebGL2 context | Epic 1 / Story 1.2 | ✅ Covered |
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| FR2 | Canvas at z-index derived from anchor SVG layer | Epic 1 / Story 1.2 | ✅ Covered |
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| FR3 | Register layer by anchor ID + render callback | Epic 1 / Story 1.3 | ✅ Covered |
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| FR4 | Maintain registry of all registered layers | Epic 1 / Story 1.3 | ✅ Covered |
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| FR5 | Sync WebGL viewport to D3 zoom transform | Epic 1 / Story 1.3 | ✅ Covered |
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| FR6 | Update WebGL transform on D3 zoom/pan change | Epic 1 / Story 1.3 | ✅ Covered |
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| FR7 | Convert map-space → WebGL clip-space coordinates | Epic 1 / Story 1.1 | ✅ Covered |
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| FR8 | Toggle layer visibility without GPU teardown | Epic 1 / Story 1.3 | ✅ Covered |
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| FR9 | Resize canvas on SVG viewport change | Epic 1 / Story 1.2 | ✅ Covered |
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| FR10 | Recalculate z-index on layer stack reorder | Epic 1 / Story 1.3 | ✅ Covered |
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| FR11 | Dispose registered layer + release GPU resources | Epic 1 / Story 1.3 | ✅ Covered |
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| FR12 | Render all relief icons via instanced rendering (single draw call) | Epic 2 / Story 2.2 | ✅ Covered |
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| FR13 | Position each relief icon at SVG-space cell coordinate | Epic 2 / Story 2.2 | ✅ Covered |
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| FR14 | Scale icons per zoom level and user scale setting | Epic 2 / Story 2.2 | ✅ Covered |
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| FR15 | Per-icon rotation from terrain dataset | Epic 2 / Stories 2.1 + 2.2 | ✅ Covered |
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| FR16 | Configurable opacity on relief icons | Epic 2 / Story 2.2 | ✅ Covered |
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| FR17 | Re-render when terrain dataset changes | Epic 2 / Story 2.2 | ✅ Covered |
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| FR18 | Detect WebGL2 unavailable → auto SVG fallback | Epic 1 / Story 1.2 + Epic 2 / Story 2.3 | ✅ Covered |
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| FR19 | SVG fallback visually identical to WebGL output | Epic 2 / Stories 2.2 + 2.3 | ✅ Covered |
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| FR20 | Canvas `pointer-events: none` — SVG layers remain interactive | Epic 2 / Story 2.2 | ✅ Covered |
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| FR21 | Existing Layers panel controls work unchanged | Epic 2 / Story 2.2 | ✅ Covered |
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| FR22 | Register new layer without z-index/lifecycle knowledge | Epic 1 / Story 1.3 | ✅ Covered |
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| FR23 | Render callback receives D3 transform state | Epic 1 / Story 1.3 | ✅ Covered |
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| FR24 | Same visibility/dispose API for all layers | Epic 1 / Story 1.3 | ✅ Covered |
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| FR25 | Coordinate sync testable via Vitest mock transform | Epic 1 / Story 1.1 | ✅ Covered |
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| FR26 | WebGL2 fallback testable via mock canvas | Epic 1 / Story 1.1 + Epic 2 / Story 2.3 | ✅ Covered |
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| FR27 | Registration API testable without real WebGL context | Epic 1 / Story 1.3 | ✅ Covered |
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**FR Coverage: 27/27 — 100% ✅**
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### NFR Coverage Matrix
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| NFR | Requirement | Story | Status |
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| ------ | ----------------------------------------- | -------------- | ---------- |
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| NFR-P1 | <16ms @ 1k icons | Story 2.2, 3.1 | ✅ Covered |
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| NFR-P2 | <100ms @ 10k icons | Story 3.1 | ✅ Covered |
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| NFR-P3 | Toggle <4ms | Story 1.3, 3.1 | ✅ Covered |
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| NFR-P4 | Pan/zoom latency <8ms | Story 1.3, 3.1 | ✅ Covered |
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| NFR-P5 | Init <200ms | Story 1.2, 3.1 | ✅ Covered |
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| NFR-P6 | No GPU teardown on hide | Story 1.3, 3.1 | ✅ Covered |
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| NFR-C1 | WebGL2 sole gate, SVG fallback on null | Story 1.2, 2.3 | ✅ Covered |
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| NFR-C2 | Cross-browser visual parity | Story 2.2 | ✅ Covered |
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| NFR-C3 | Max 2 WebGL contexts | Story 1.2 | ✅ Covered |
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| NFR-C4 | Fallback when HW accel disabled | Story 2.3 | ✅ Covered |
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| NFR-M1 | Framework has no layer-specific knowledge | Story 1.3 | ✅ Covered |
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| NFR-M2 | New layer = 1 register() call | Story 1.3 | ✅ Covered |
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| NFR-M3 | Global Module Pattern | Story 1.2 | ✅ Covered |
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| NFR-M4 | Sync formula documented in code | Story 1.1 | ✅ Covered |
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| NFR-M5 | ≥80% Vitest coverage on framework core | Story 1.1, 1.3 | ✅ Covered |
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| NFR-B1 | Named Three.js imports only | Story 3.2 | ✅ Covered |
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| NFR-B2 | ≤50KB gzip bundle increase | Story 3.2 | ✅ Covered |
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**NFR Coverage: 17/17 — 100% ✅**
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**Missing Requirements: NONE**
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---
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## UX Alignment Assessment
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### UX Document Status
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Not found — **expected and acceptable.** This project introduces a WebGL rendering layer into a developer/worldbuilder tool. The PRD explicitly states: "No new keyboard shortcuts or UI controls are introduced by the framework itself" and "The existing layer visibility toggle is reused." The canvas element carries `aria-hidden="true"` (purely decorative/visual). No user-facing UI changes are in scope for this feature.
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### Alignment Issues
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None. All user-interaction requirements (FR20, FR21) are captured in Story 2.2 with specific, testable ACs. The Layers panel is unchanged by design. `pointer-events: none` on the canvas is validated in Story 1.2 DOM setup.
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### Warnings
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⚠️ Minor: If future phases (Phase 2 DOM-split, Phase 3 full GPU migration) introduce user-facing controls or new panel elements, a UX document should be created at that time. No action required for MVP.
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---
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## Epic Quality Review
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### Epic Structure Validation
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#### Epic 1: WebGL Layer Framework Module
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- **User value:** ⚠️ This is a technical foundation epic. However, for this brownfield project type, this is correct and necessary — the user value is delivered by Epic 2 (fast terrain rendering); Epic 1 is the required platform. Architecture explicitly calls this a "Platform MVP." Categorized as acceptable for this project context.
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- **Independence:** ✅ Epic 1 stands fully alone. All three stories within it are sequentially independent.
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- **Brownfield indicator:** ✅ No "set up from starter template" story needed — this is brownfield insertion. The framework is added to an existing codebase.
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#### Epic 2: Relief Icons Layer Migration
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- **User value:** ✅ Clear user outcome — worldbuilders experience fast terrain rendering with no perceived lag. Journey 1 (Katrin's dense continent) maps directly here.
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- **Independence:** ✅ Uses Epic 1 output only. No forward dependency on Epic 3.
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- **Story 2.1→2.2 dependency:** ✅ Correct sequence. Story 2.1 (rotation verification) is a prerequisite investigation that 2.2 builds upon — this is a valid intra-epic sequential dependency, not a forward dependency.
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#### Epic 3: Quality & Bundle Integrity
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- **User value:** ⚠️ No direct end-user value — these are quality gates. However, for a performance-critical feature with hard NFR targets, a dedicated validation epic is standard and warranted. The NFR targets (16ms, 100ms, 50KB) are measurable commitments.
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- **Independence:** ✅ Epic 3 requires Epics 1+2 complete, which is the natural final phase.
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### Story Quality Assessment
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#### Story Sizing
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| Story | Size Assessment | Verdict |
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| ---------------------------------- | -------------------------------------------------------------- | ------------- |
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| 1.1: Pure functions + TDD scaffold | Small — 3 pure functions + test file | ✅ Well-sized |
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| 1.2: Init, canvas, DOM setup | Medium — constructor, init(), ResizeObserver, D3 zoom | ✅ Well-sized |
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| 1.3: Layer lifecycle + render loop | Medium-large — 7 public methods + private render | ⚠️ See note |
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| 2.1: Rotation verification | Tiny — investigation + optional fix | ✅ Well-sized |
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| 2.2: Refactor draw-relief-icons.ts | Medium — register() call + 3 window globals + buildReliefScene | ✅ Well-sized |
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| 2.3: Fallback verification | Small — Vitest test + visual verification | ✅ Well-sized |
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| 3.1: Performance benchmarking | Small — measurement + documentation | ✅ Well-sized |
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| 3.2: Bundle size audit | Small — build + analysis | ✅ Well-sized |
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**Story 1.3 note:** This story covers 7 public methods (`register`, `unregister`, `setVisible`, `clearLayer`, `requestRender`, `syncTransform`, and the private `render` dispatch loop). This is the densest story. It is cohesive — all methods form a single logical unit (the layer management and render loop). It would be reasonable to split into 1.3a (register/unregister/setVisible/clearLayer) and 1.3b (requestRender/syncTransform/render loop) if a developer finds it too large. Not a blocker, but flagged for developer discretion.
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#### Acceptance Criteria Quality
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- ✅ All ACs use Given/When/Then BDD format
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- ✅ All performance ACs include specific numeric targets (ms, percentage, KB)
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- ✅ Error/fallback conditions covered (fallback path, missing DOM element, context unavailable)
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- ✅ Each AC is independently verifiable
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- ⚠️ Story 2.2 AC "1,000-icon map renders in <16ms" requires a real browser environment — Vitest alone cannot satisfy this AC. This is intentional (matches NFR-P1 intent) but the developer must understand this requires manual/DevTools measurement, not an automated test assertion.
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### Dependency Analysis
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#### Forward Dependencies Check
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- Story 1.1 → no dependencies ✅
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- Story 1.2 → depends on 1.1 (uses `detectWebGL2`, `getLayerZIndex`) ✅
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- Story 1.3 → depends on 1.2 (requires initialized framework) ✅
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- Story 2.1 → no framework dependency (code analysis only) ✅
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- Story 2.2 → depends on Epic 1 complete ✅
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- Story 2.3 → depends on 2.2 (verifies the refactored module's fallback path) ✅
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- Story 3.1 → depends on 2.2 complete ✅
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- Story 3.2 → depends on 2.2 complete (needs built module) ✅
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**No forward dependencies detected. All dependency flows are downstream only.**
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#### Architecture/Brownfield Checks
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- ✅ No starter template story required (brownfield — confirmed by Architecture doc)
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- ✅ No "create all tables upfront" equivalent — no database, no upfront resource creation
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- ✅ Window globals (`drawRelief`, `undrawRelief`, `rerenderReliefIcons`) backward-compatibility requirement is explicitly carried into Story 2.2 ACs
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- ✅ `pendingConfigs[]` queue pattern (register before init) is covered in Story 1.3 — the ordering hazard is explicitly tested
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- ✅ `hasFallback` backing-field TypeScript pattern is explicitly called out in Story 1.2 — the known compile-time footgun is documented and tested
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### Best Practices Compliance
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| Check | Status | Notes |
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| ----------------------------------------- | ---------- | ------------------------------------------------------------------- |
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| Epics deliver user value | ⚠️ Partial | Epics 1 & 3 are technical; acceptable for this platform MVP context |
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| Epic independence | ✅ | Each epic functions on prior epics only |
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| No forward dependencies | ✅ | Clean downstream-only dependency graph |
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| Appropriate story sizing | ✅ | Story 1.3 marginally large but cohesive |
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| ACs are testable | ✅ | All numeric, format-specific, verifiable |
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| FR traceability | ✅ | 27/27 FRs traceable to stories |
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| Brownfield handled correctly | ✅ | No incorrect startup/migration stories |
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| Architecture constraints carried into ACs | ✅ | backing field, canvas id, pointer-events, etc. all present |
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---
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## Summary and Recommendations
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### Overall Readiness Status
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# ✅ READY FOR IMPLEMENTATION
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All 27 FRs and 17 NFRs are covered. No critical violations. No blocking issues.
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### Issues Found
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| Severity | Count | Items |
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| ----------- | ----- | --------- |
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| 🔴 Critical | 0 | — |
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| 🟠 Major | 0 | — |
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| 🟡 Minor | 3 | See below |
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**🟡 Minor — Story 1.3 density:** The 7-method scope is cohesive but large. Developer may optionally split into 1.3a (state management: register/unregister/setVisible/clearLayer) and 1.3b (render loop: requestRender/syncTransform/render dispatch). No structural change to epics required.
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**🟡 Minor — Story 2.2 performance AC:** The <16ms render time AC requires browser DevTools measurement, not an automated Vitest assertion. Developer must not attempt to satisfy this in unit tests — it is a manual benchmark. The story AC is correct; this is a documentation awareness item.
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**🟡 Minor — Epic 3 user value:** Stories 3.1 and 3.2 are quality gates, not user-facing features. If team velocity is a concern, these could be folded into Definition of Done criteria for Epic 2 stories rather than standalone stories. No action required unless team prefers this structure.
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### Recommended Next Steps
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1. **Begin implementation at Story 1.1** — create `src/modules/webgl-layer-framework.ts` with the three pure exported functions and the Vitest test file. This is pure TypeScript with zero DOM/WebGL dependencies and is the cleanest entry point.
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2. **Optionally split Story 1.3** into 1.3a (state management) and 1.3b (render loop) before handing off to the dev agent if the team prefers smaller units.
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3. **Baseline SVG render times before Story 2.2** — measure current `drawRelief()` timing on a 1k and 10k icon map before the refactor so the >80% improvement claim can be verified objectively in Story 3.1.
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4. **No UX document needed for MVP** — revisit if Phase 2 (DOM-split) or Phase 3 introduce user-facing panel changes.
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### Final Note
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This assessment identified **3 minor items** across quality and sizing categories. Zero critical or major issues were found. The PRD, Architecture, and Epics documents are well-aligned, requirements are fully traced, dependencies are clean, and the brownfield integration constraints are correctly carried into acceptance criteria. The project is ready to hand off to the development agent.
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---
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_Assessment completed: 2026-03-12 — Fantasy-Map-Generator WebGL Layer Framework MVP_
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---
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