# Feature Specification: Migrate to WebKitGTK 6.0

**Feature Branch**: `004-migrate-to-webkitgtk`  
**Created**: 2025-01-21  
**Status**: Draft  
**Input**: User description: "Migrate To webkitgtk-6.0, I Want to migrate the entire project to webkitgtk6 in order to be able to enable GPU rendering through vulkan layer"

## Execution Flow (main)
```
1. Parse user description from Input
   → Migrate browser to WebKitGTK 6.0 for Vulkan GPU rendering
2. Extract key concepts from description
   → Identified: migration, WebKitGTK 6.0, GPU rendering, Vulkan support
3. For each unclear aspect:
   → Performance targets marked for clarification
   → Migration timeline marked for clarification
4. Fill User Scenarios & Testing section
   → User flow: Browser continues to work with improved GPU performance
5. Generate Functional Requirements
   → Each requirement is testable
   → Migration scope defined
6. Identify Key Entities
   → Browser engine, rendering pipeline, GPU acceleration
7. Run Review Checklist
   → WARN "Spec has uncertainties around performance targets"
8. Return: SUCCESS (spec ready for planning)
```

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## ⚡ Quick Guidelines
- ✅ Focus on WHAT users need and WHY
- ❌ Avoid HOW to implement (no tech stack, APIs, code structure)
- 👥 Written for business stakeholders, not developers

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## User Scenarios & Testing

### Primary User Story
As a user of the dumber browser, I want the browser to utilize modern GPU acceleration capabilities through Vulkan rendering, resulting in smoother scrolling, faster page rendering, and improved performance for graphics-intensive web content, while maintaining all existing browser functionality.

### Acceptance Scenarios
1. **Given** a user opens the browser, **When** they navigate to any website, **Then** the browser renders pages using GPU acceleration when available
2. **Given** a user visits a graphics-intensive website (e.g., with 3D content, animations), **When** the page loads, **Then** GPU rendering provides smooth performance without visual artifacts
3. **Given** a system with Vulkan-capable GPU, **When** the browser starts, **Then** it automatically detects and enables GPU acceleration
4. **Given** a system without Vulkan support, **When** the browser starts, **Then** it gracefully falls back to software rendering
5. **Given** the browser is using GPU acceleration, **When** monitoring system resources, **Then** CPU usage is reduced compared to software rendering

### Edge Cases
- What happens when GPU drivers are outdated or incompatible?
- How does system handle GPU driver crashes during browsing?
- What happens on systems with multiple GPUs (integrated + discrete)?
- How does browser perform on low-end GPUs vs high-end GPUs?
- What happens when switching between GPU and software rendering mid-session?

## Requirements

### Functional Requirements
- **FR-001**: System MUST maintain all existing browser functionality after migration
- **FR-002**: System MUST support GPU-accelerated rendering when Vulkan-capable hardware is available
- **FR-003**: System MUST provide fallback to software rendering when GPU acceleration is unavailable
- **FR-004**: System MUST maintain backward compatibility with existing user data (bookmarks, history, settings)
- **FR-005**: System MUST preserve current browser interface and user experience
- **FR-006**: System MUST detect GPU capabilities at startup and choose appropriate rendering path
- **FR-007**: System MUST handle GPU driver failures gracefully without crashing
- **FR-008**: Browser performance MUST improve by [NEEDS CLARIFICATION: specific performance target not specified - 20%? 50%? What metrics?]
- **FR-009**: System MUST support common web standards (HTML5, CSS3, JavaScript) without regression
- **FR-010**: System MUST maintain support for all previously working websites
- **FR-011**: GPU memory usage MUST remain within [NEEDS CLARIFICATION: acceptable limits not specified]
- **FR-012**: Migration MUST be completed within [NEEDS CLARIFICATION: timeline not specified]

### Key Entities
- **Browser Engine**: Core rendering engine that processes and displays web content
- **GPU Rendering Pipeline**: System component responsible for hardware-accelerated graphics
- **Fallback Renderer**: Software-based rendering system for non-GPU scenarios
- **Performance Monitor**: Component tracking rendering performance and resource usage
- **Compatibility Layer**: System ensuring existing functionality works with new rendering engine

---

## Review & Acceptance Checklist
*GATE: Automated checks run during main() execution*

### Content Quality
- [x] No implementation details (languages, frameworks, APIs)
- [x] Focused on user value and business needs
- [x] Written for non-technical stakeholders
- [x] All mandatory sections completed

### Requirement Completeness
- [ ] No [NEEDS CLARIFICATION] markers remain
- [x] Requirements are testable and unambiguous (except marked items)
- [ ] Success criteria are measurable (performance targets needed)
- [x] Scope is clearly bounded
- [x] Dependencies and assumptions identified

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## Execution Status
*Updated by main() during processing*

- [x] User description parsed
- [x] Key concepts extracted
- [x] Ambiguities marked
- [x] User scenarios defined
- [x] Requirements generated
- [x] Entities identified
- [ ] Review checklist passed (has clarifications needed)

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