# STATE: Super Pong Next Gen

**Project Reference**
- **Core Value:** Pong reimagined with juice and depth — spectacular visuals, rich mechanics, complete game experience
- **Current Focus:** Phase 1 — executing plans
- **Key Constraint:** Coarse granularity (5 phases max), HTML5 Canvas + vanilla JS, static deployment

---

## Current Position

| Attribute | Value |
|-----------|-------|
| **Phase** | 01-foundation |
| **Plan** | Plan 2/2 (01-02 next) |
| **Status** | Plan 01-01 complete — scaffold, HiDPI canvas, game loop, Player 1 input done |
| **Progress** | 5% (1/2 plans complete in Phase 1) |

```
[=                   ] 5% — Phase 1: Plan 1/2 complete
```

---

## Performance Metrics

| Metric | Target | Status |
|--------|--------|--------|
| **Phase Coverage** | 100% (37/37 requirements mapped) | ✓ Complete |
| **Success Criteria** | 2-5 per phase | ✓ Complete |
| **Dependency Chain** | Linear (P1 → P2 → P3 → P4 → P5) | ✓ Validated |
| **01-01 Duration** | — | 1 min (2 tasks, 1 file) |

---

## Accumulated Context

### Key Decisions Made

1. **Coarse Granularity Compression:** Research suggested 10 phases; compressed to 5 by merging:
   - Game loop + input + physics = Phase 1
   - Second paddle + AI = Phase 2
   - Menus + audio + pause = Phase 3
   - Visual effects + power-ups + arenas = Phase 4
   - Performance + testing = Phase 5

2. **Phase 5 (Release) Has No Requirements:** All 37 v1 requirements covered by phases 1-4. Phase 5 is purely validation (cross-browser, performance, pitfall mitigation).

3. **Success Criteria Grounded in Research Pitfalls:** Each phase's criteria address critical pitfalls from research:
   - Phase 1: DPI scaling, game loop timing
   - Phase 2: Ball tunneling, input lag, AI balance
   - Phase 3: Audio autoplay policy
   - Phase 4: Power-up balance
   - Phase 5: Performance, memory leaks, cross-browser

4. **deltaTime Cap at 50ms:** Game loop caps deltaTime to prevent physics explosion when tab loses focus and resumes — without this a single large delta would fling the ball off screen.

5. **Logical vs Bitmap Coordinate Separation:** canvas.width/height = logical * devicePixelRatio; ctx.scale(dpr, dpr) makes all game draw calls use logical pixels — correct HiDPI approach for sharp rendering on Retina displays.

6. **Module-Object Pattern Established:** GameLoop, Renderer, Input, Physics, GameState are plain JS objects with init() methods in a single script tag. No classes, no modules, no build step — runs directly from filesystem.

7. **e.code over e.key for Input:** Using e.code === 'KeyW' makes W/S detection layout-independent (works on AZERTY and other non-QWERTY keyboards).

### Coverage Validation

**Total v1 Requirements:** 37
- CORE (8): All mapped to Phase 1-2
- AI (4): All mapped to Phase 2
- SCRN (4): All mapped to Phase 3
- VFX (5): All mapped to Phase 1 (DPI) and Phase 4 (particles/glow/trails/shake)
- PWR (7): All mapped to Phase 4
- ARENA (4): All mapped to Phase 4
- AUD (5): All mapped to Phase 3

**Unmapped Requirements:** 0 ✓
**Coverage:** 100% ✓

### Research Alignment

- Phase 1 addresses Research Pitfalls: #1 (Game Loop Timing), #2 (Canvas DPI Scaling)
- Phase 2 addresses Research Pitfalls: #3 (Ball Tunneling), #4 (Input Lag), #5 (AI Difficulty Balance)
- Phase 3 addresses Research Pitfall: #6 (WebAudio Autoplay Policy)
- Phase 4 addresses Research Pitfalls: #7 (Power-Up Balance)
- Phase 5 addresses Research Pitfall: #8 (Memory Leaks)

---

## Session Continuity

### What Just Happened

Plan 01-01 executed: Created index.html with full-window HiDPI canvas, Renderer (devicePixelRatio aware), GameLoop (requestAnimationFrame + deltaTime), Input (W/S keys), Physics skeleton (paddle movement + clamping), and GameState. Player 1 paddle is visible and responsive. Requirements VFX-05 and CORE-07 satisfied.

### What Comes Next

1. Execute Plan 01-02 — Ball physics: movement, wall bounce, zone-based angle deflection, per-hit speed increment
2. Continue through phases 2-5 after Phase 1 complete

### Known Blockers

None.

### Decisions Pending

None.

### Last Session

Stopped at: Completed 01-01-PLAN.md (2026-03-10)

---

*State initialized: 2026-03-10*