GPU Rendering Validation Checklist
Status of GPU rendering verification across platforms and configurations.
Verified (Real Hardware)
| Platform |
Backend |
Surface |
Rendering |
Status |
| macOS (Apple Silicon) |
Metal |
CAMetalLayer (NSView) |
Skia Graphite |
Verified — GPU demo runs at 60fps |
| macOS (Apple Silicon) |
Metal |
CAMetalLayer (PluginViewHost) |
Skia Graphite |
Verified — DAW-embedded rendering |
Implemented (Awaiting Hardware Validation)
| Platform |
Backend |
Surface |
Rendering |
Status |
| iOS |
Metal |
CAMetalLayer (UIView) |
Skia Graphite |
Implemented — IOSGpuWindowHost + IOSGpuPluginViewHost |
| Windows |
D3D12 |
HWND (SDL3) |
Skia Graphite |
Implemented — SDL3 HWND extraction + Dawn D3D12 |
| Linux/X11 |
Vulkan |
X11 Window (SDL3) |
Skia Graphite |
Implemented — SDL3 X11 extraction + Dawn Vulkan |
| Android |
Vulkan |
ANativeWindow (SurfaceView) |
Skia Graphite |
Implemented — ANativeWindow extraction + Dawn Vulkan |
Architecture
Platform Window (NSView/UIView/HWND/SurfaceView/SDL3)
│
▼
Native Surface Handle (CAMetalLayer*/HWND/ANativeWindow/X11 Window)
│
▼
GpuSurface (Dawn/WebGPU)
├── Metal backend (macOS/iOS)
├── D3D12 backend (Windows)
└── Vulkan backend (Linux)
│
▼
SkiaSurface (Skia Graphite)
│
▼
SkCanvas → View tree painting
Render Loop
| Platform |
Mechanism |
Target FPS |
| macOS |
CVDisplayLink → main queue dispatch |
Display refresh (60-120Hz) |
| iOS |
CADisplayLink |
Display refresh (60-120Hz) |
| Android |
AChoreographer |
Display refresh |
| Windows |
DwmFlush, with timer fallback if DWM is unavailable |
Display refresh or 60Hz fallback |
| Linux |
Timer fallback until native present-sync is wired |
60Hz |
| WASM |
requestAnimationFrame |
Display refresh |
Known Limitations
- Windows GPU:
DwmFlush gives compositor-paced frames when DWM is available; headless or remote sessions degrade to the 60Hz timer fallback
- Linux GPU: X11 surface creation is wired, but frame pacing is still the 60Hz timer fallback
- iOS GPU: CADisplayLink frame pacing exists, but device runtime validation is still pending
- Linux Wayland: SDL3 can extract Wayland handles, but
GpuSurface presentation consumes X11 handles only today
- WASM: WebGPU support depends on browser (Chrome 113+, Firefox 120+)
Test Coverage
- 13 cross-platform render tests (GpuSurface + SkiaSurface)
- GPU demo validates continuous animation, vector drawing, resize
- Headless tests verify surface creation and texture lifecycle