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Simple Directmedia Layer
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Simon McVittie fdd945f2af joystick: Use a better heuristic to guess what is a joystick 
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>
 		2020-11-11 19:14:52 -08:00
VisualC Be explicit about mapping the new game controller paddle buttons 2020-11-07 02:22:15 -08:00
VisualC-WinRT url: WinRT actually works now (and has been tested, hooray!). 2020-10-06 00:42:17 -04:00
Xcode Fix MakeThreadRealtime DBus method call on Linux, type mismatch due to copy paste. 2020-11-09 10:11:38 -08:00
Xcode-iOS Be explicit about mapping the new game controller paddle buttons 2020-11-07 02:22:15 -08:00
acinclude ac_check_define.m4: remove stray AC_DEFINE outside of the macro definition 2020-09-16 22:20:02 +03:00
android-project Android: keep compatibility with older JDK 2020-10-28 14:03:05 +01:00
android-project-ant Added the old ant Android build project structure 2017-10-28 12:11:25 -07:00
build-scripts Fixed mkdir warning when running iosbuild.sh multiple times 2020-05-27 09:57:51 -07:00
cmake cmake: Set HAVE_VIDEO_WAYLAND_QT_TOUCH if appropriate (thanks, Michael!). 2020-04-14 18:14:39 -04:00
debian Backed out changeset 51622f74dc85 2020-03-10 18:35:31 -07:00
docs added documentation docs/README-os2.md (based on original readme.os2). 2020-10-14 23:01:06 +03:00
include Added SDL_JoystickRumbleTriggers() and SDL_GameControllerRumbleTriggers() 2020-11-11 18:57:37 -08:00
src joystick: Use a better heuristic to guess what is a joystick 2020-11-11 19:14:52 -08:00
test Added SDL_JoystickRumbleTriggers() and SDL_GameControllerRumbleTriggers() 2020-11-11 18:57:37 -08:00
visualtest test: unify all the command line usage logging. 2019-05-28 17:39:13 -04:00
wayland-protocols wayland: ask xdg-decoration protocol extension to use server-side decorations if possible. 2018-11-04 21:08:40 +01:00
.hgignore Fixed bug 4965 - Update the .hgignore file 2020-02-03 16:38:07 -08:00
Android.mk minor whitespace fix 2020-10-09 03:28:30 +03:00
BUGS.txt BUGS.txt: Changed mailing list link to discourse.libsdl.org. 2017-04-01 00:05:25 -04:00
CMakeLists.txt udev: Factor out SDL_EVDEV_GuessDeviceClass 2020-11-11 19:14:34 -08:00
COPYING.txt Updated copyright date for 2020 2020-01-16 20:49:25 -08:00
CREDITS.txt Fixed crash if initialization of EGL failed but was tried again later. 2015-06-21 17:33:46 +02:00
INSTALL.txt More HTTPS doc tweaks. 2017-02-16 16:59:07 -05:00
Makefile.in Updated iOS tests and demos for latest SDL linking requirements 2020-11-06 13:03:07 -08:00
Makefile.minimal Added a dummy sensor driver 2018-08-21 13:29:21 -07:00
Makefile.os2 Makefile.os2: remove duplicated OPTION QUIET directives from linker file 2020-10-19 04:33:03 +03:00
Makefile.pandora Added a dummy sensor driver 2018-08-21 13:29:21 -07:00
Makefile.psp added SDL_strtokr() as a replacement for POSIX strtok_r (bug #4046.) 2019-11-20 20:40:50 +03:00
Makefile.wiz Added a dummy sensor driver 2018-08-21 13:29:21 -07:00
README-SDL.txt More HTTPS changes in the documentation. 2017-02-16 16:52:03 -05:00
README.txt readme: correct webpage URL to use HTTPS. 2017-02-16 13:30:34 -05:00
SDL2.spec.in Fixed bug 4615 - RPM Build fails due to unpackaged files 2019-06-11 19:58:10 -07:00
SDL2Config.cmake Fixed bug 3651 - CMake build does not install CMake package configuration 2017-08-09 19:03:10 -07:00
TODO.txt Fixed crash if initialization of EGL failed but was tried again later. 2015-06-21 17:33:46 +02:00
VisualC.html Fixed two typos in documentation. 2016-01-12 22:23:53 +01:00
WhatsNew.txt Updated WhatsNew.txt with SDL 2.0.12 release notes 2020-03-02 11:39:44 -08:00
autogen.sh Don't use pushd/popd in autogen.sh; Ubuntu's /bin/sh doesn't support it. 2016-12-26 22:58:58 -05:00
cmake_uninstall.cmake.in Fixed bug 3867 - Can't find install_manifest.txt when running 'uninstall' target 2017-10-12 08:44:45 -07:00
configure udev: Factor out SDL_EVDEV_GuessDeviceClass 2020-11-11 19:14:34 -08:00
configure.ac udev: Factor out SDL_EVDEV_GuessDeviceClass 2020-11-11 19:14:34 -08:00
sdl2-config-version.cmake.in cmake: Forgot to add this file to revision control. 2020-02-25 14:52:03 -05:00
sdl2-config.cmake.in build: Merge pkg-config Libs.private into Libs for static-only builds 2020-04-11 23:38:34 +01:00
sdl2-config.in build: Don't duplicate Libs in Libs.private in pkg-config file 2020-04-12 13:24:36 +01:00
sdl2.m4 Fixed bug 4544 - SDL2.m4 SDL2.framework patch made it impossible to fail detection 2019-03-16 18:45:10 -07:00
sdl2.pc.in build: Merge pkg-config Libs.private into Libs for static-only builds 2020-04-11 23:38:34 +01:00

README.txt 

                         Simple DirectMedia Layer

                                  (SDL)

                                Version 2.0

---
https://www.libsdl.org/

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

Enjoy!
	Sam Lantinga				(slouken@libsdl.org)