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fdd945f2af
Previously we only checked for at least one button or key and at least the X and Y absolute axes, but this has both false positives and false negatives. Graphics tablets, trackpads and touchscreens all have buttons and absolute X and Y axes, but we don't want to detect those as joysticks. On normal Linux systems ordinary users do not have access to these device nodes, but members of the 'input' group do. Conversely, some game controllers only have digital buttons and no analogue axes (the Nintendo Wiimote is an example), and some have axes and no buttons (steering wheels or flight simulator rudders might not have buttons). Use the more elaborate heuristic factored out from SDL's udev code path to handle these cases. In an ideal world we could use exactly the same heuristic as udev's input_id builtin, but that isn't under a suitable license for inclusion in SDL, so we have to use a parallel implementation of something vaguely similar. Signed-off-by: Simon McVittie <smcv@collabora.com>
59 lines
2.2 KiB
C
59 lines
2.2 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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Copyright (C) 2020 Collabora Ltd.
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#ifndef SDL_evdev_capabilities_h_
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#define SDL_evdev_capabilities_h_
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#if HAVE_LIBUDEV_H || defined(SDL_JOYSTICK_LINUX)
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#include <linux/input.h>
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/* A device can be any combination of these classes */
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typedef enum
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{
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SDL_UDEV_DEVICE_UNKNOWN = 0x0000,
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SDL_UDEV_DEVICE_MOUSE = 0x0001,
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SDL_UDEV_DEVICE_KEYBOARD = 0x0002,
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SDL_UDEV_DEVICE_JOYSTICK = 0x0004,
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SDL_UDEV_DEVICE_SOUND = 0x0008,
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SDL_UDEV_DEVICE_TOUCHSCREEN = 0x0010
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} SDL_UDEV_deviceclass;
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#define BITS_PER_LONG (sizeof(unsigned long) * 8)
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#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
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#define EVDEV_OFF(x) ((x)%BITS_PER_LONG)
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#define EVDEV_LONG(x) ((x)/BITS_PER_LONG)
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#define test_bit(bit, array) ((array[EVDEV_LONG(bit)] >> EVDEV_OFF(bit)) & 1)
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extern int SDL_EVDEV_GuessDeviceClass(unsigned long bitmask_ev[NBITS(EV_MAX)],
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unsigned long bitmask_abs[NBITS(ABS_MAX)],
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unsigned long bitmask_key[NBITS(KEY_MAX)],
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unsigned long bitmask_rel[NBITS(REL_MAX)]);
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#endif /* HAVE_LIBUDEV_H || defined(SDL_JOYSTICK_LINUX) */
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#endif /* SDL_evdev_capabilities_h_ */
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/* vi: set ts=4 sw=4 expandtab: */
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