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xpad has a series of questionable design choices when it comes to button mapping. Notably, BTN_TRIGGER_HAPPY1-4 are used for the D-pad on dance mats instead of the typical BTN_DPAD_*, and maps the paddles to BTN_TRIGGER_HAPPY5-8. This commit plumbs through driver detection for a udev device and adds special exceptions for xpad's quirks. Newer kernels (6.17+) add the BTN_GRIP* mappings for paddles on controllers. We should prefer that if available, as its meaning and mapping is unambiguous. However, since it's only in new kernels, we need to maintain the older mappings where we know they exist. It also exposes KEY_RECORD as the share button regardless of vendor, which had previously been gated behind being a Microsoft controller. All Xbox Series controllers can include this button, and many third party ones do.
Simple DirectMedia Layer (SDL for short) is a cross-platform library designed to make it easy to write multi-media software, such as games and emulators.
You can find the latest release and additional information at: https://www.libsdl.org/
Installation instructions and a quick introduction is available in INSTALL.md
This library is distributed under the terms of the zlib license, available in LICENSE.txt.
Enjoy!
Sam Lantinga (slouken@libsdl.org)