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This patch adds an API for querying pressure- sensitive pens, cf. SDL_pen.h: - Enumerate all pens - Get pen capabilities, names, GUIDs - Distinguishes pens and erasers - Distinguish attached and detached pens - Pressure and tilt support - Rotation, distance, throttle wheel support (throttle wheel untested) - Pen type and meta-information reporting (partially tested) Pen event reporting: - Three new event structures: PenTip, PenMotion, and PenButton - Report location with sub-pixel precision - Include axis and button status, is-eraser flag Internal pen tracker, intended to be independent of platform APIs, cf. SDL_pen_c.h: - Track known pens - Handle pen hotplugging Automatic test: - testautomation_pen.c Other features: - XInput2 implementation, incl. hotplugging - Wayland implementation, incl. hotplugging - Backward compatibility: pen events default to emulating pens with mouse ID SDL_PEN_MOUSEID - Can be toggled via SDL_HINT_PEN_NOT_MOUSE - Test/demo program (testpen) - Wacom pen feature identification by pen ID Acknowledgements: - Ping Cheng (Wacom) provided extensive feedback on Wacom pen features and detection so that hopefully untested Wacom devices have a realistic chance of working out of the box.
Simple DirectMedia Layer (SDL) Version 3.0
Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting with README.md. If you are migrating to SDL 3.0 from SDL 2.0, the changes are extensively documented in README-migration.md.
Enjoy!
Sam Lantinga (slouken@libsdl.org)