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// Headless Mode Documentation
// Workspace: demo (shared across all workspaces)
# Headless Mode
Minimal GPU/platform stubs for testing without graphics.
## Use Cases
- CI/CD without GPU
- Audio/tracker iteration
- Timeline validation
- Fast testing cycles
## Build
```bash
cmake -B build_headless -DDEMO_HEADLESS=ON
cmake --build build_headless -j4
```
Or use the test script:
```bash
./scripts/test_headless.sh
```
## Usage
```bash
# 30s simulation (default)
./build_headless/demo64k --headless
# Custom duration
./build_headless/demo64k --headless --duration 60
# Audio validation
./build_headless/demo64k --dump_wav test.wav
```
Progress printed every 5s.
## Implementation
- **GPU stub:** Validates lifecycle, maintains MainSequence
- **Platform stub:** Simulates 60Hz time progression
- **Main loop:** Audio updates without rendering
## vs STRIP_EXTERNAL_LIBS
| Feature | HEADLESS | STRIP_EXTERNAL_LIBS |
|---------|----------|---------------------|
| Compiles | Yes | Yes |
| Runs | Yes | No |
| Audio | Full | No-op |
| Timeline | Full | No |
| Tests | Pass | Fail |
See `src/gpu/headless_gpu.cc` and `src/platform/headless_platform.cc` for details.
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