docs: add comprehensive SDL2 frontend compatibility analysis #53
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Add detailed documentation analyzing the PHP-SDL2 implementation gaps compared to the terminal frontend: - Feature-by-feature comparison of CLI vs SDL2 frontends - Implementation guide with code examples for missing features - Quick reference for file locations and architecture Key findings: - SDL2 is ~60% complete with input/display working - Audio output is the critical blocker (not implemented) - Missing frontend selection, hotkeys, and OSD features - Estimated 6-9 hours to reach MVP, 11-15 hours for feature parity
Add complete SDL2 audio support to achieve feature parity with CLI frontend: - Implement SdlAudioSink class with SDL2 audio subsystem integration - Add real-time audio playback using SDL_QueueAudio - Support configurable sample rate (default 44100 Hz) and buffer size - Implement 16-bit signed stereo output with automatic overflow protection - Add --frontend=cli|sdl command-line option for frontend selection - Integrate SDL2 audio sink when using SDL frontend with --audio flag - Update help text with SDL2 frontend documentation - Add SDL extension detection with helpful error messages Technical details: - Sample format: AUDIO_S16LSB (16-bit signed little-endian) - Channels: 2 (stereo) - Default buffer: 512 samples (configurable 128-8192) - Automatic graceful degradation if SDL audio unavailable The SDL2 frontend now has complete feature parity with CLI for core emulation functionality (input, display, audio). Remaining work is UX enhancements (hotkeys, OSD, window management). Usage: php bin/phpboy.php rom.gb --frontend=sdl --audio Updated documentation to reflect SDL2 production-ready status.
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Add PHPStan ignore patterns for SDL2 extension functions and constants used in SdlAudioSink that are not available at static analysis time: - Ignore lowercase sdl_* functions (e.g., sdl_queue_audio) - Ignore AUDIO_* constants (e.g., AUDIO_S16LSB) - Ignore SDL class static method calls - Ignore method_exists checks on SDL class These SDL2 functions/constants are runtime dependencies from the optional PHP SDL extension and are properly guarded with extension_loaded checks and error handling in the code.
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Add detailed documentation analyzing the PHP-SDL2 implementation gaps compared to the terminal frontend:
Key findings: