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d6476155
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2020-03-15T13:35:03
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virtual joysticks: improved docs for SDL_JoystickSetVirtual* functions
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cc908756
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2020-03-15T13:25:49
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virtual joysticks: removed ball support (Bug 5028)
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2be75c6a
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2020-03-13T19:08:45
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Fixed bug 5028 - Virtual Joysticks (new joystick backend)
David Ludwig
I have created a new driver for SDL's Joystick and Game-Controller subsystem: a Virtual driver. This driver allows one to create a software-based joystick, which to SDL applications will look and react like a real joystick, but whose state can be set programmatically. A primary use case for this is to help enable developers to add touch-screen joysticks to their apps.
The driver comes with a set of new, public APIs, with functions to attach and detach joysticks, set virtual-joystick state, and to determine if a joystick is a virtual-one.
Use of virtual joysticks goes as such:
1. Attach one or more virtual joysticks by calling SDL_JoystickAttachVirtual. If successful, this returns the virtual-device's joystick-index.
2. Open the virtual joysticks (using indicies returned by SDL_JoystickAttachVirtual).
3. Call any of the SDL_JoystickSetVirtual* functions when joystick-state changes. Please note that virtual-joystick state will only get applied on the next call to SDL_JoystickUpdate, or when pumping or polling for SDL events (via SDL_PumpEvents or SDL_PollEvent).
Here is a listing of the new, public APIs, at present and subject to change:
------------------------------------------------------------
/**
* Attaches a new virtual joystick.
* Returns the joystick's device index, or -1 if an error occurred.
*/
extern DECLSPEC int SDLCALL SDL_JoystickAttachVirtual(SDL_JoystickType type, int naxes, int nballs, int nbuttons, int nhats);
/**
* Detaches a virtual joystick
* Returns 0 on success, or -1 if an error occurred.
*/
extern DECLSPEC int SDLCALL SDL_JoystickDetachVirtual(int device_index);
/**
* Indicates whether or not a virtual-joystick is at a given device index.
*/
extern DECLSPEC SDL_bool SDLCALL SDL_JoystickIsVirtual(int device_index);
/**
* Set values on an opened, virtual-joystick's controls.
* Returns 0 on success, -1 on error.
*/
extern DECLSPEC int SDLCALL SDL_JoystickSetVirtualAxis(SDL_Joystick * joystick, int axis, Sint16 value);
extern DECLSPEC int SDLCALL SDL_JoystickSetVirtualBall(SDL_Joystick * joystick, int ball, Sint16 xrel, Sint16 yrel);
extern DECLSPEC int SDLCALL SDL_JoystickSetVirtualButton(SDL_Joystick * joystick, int button, Uint8 value);
extern DECLSPEC int SDLCALL SDL_JoystickSetVirtualHat(SDL_Joystick * joystick, int hat, Uint8 value);
------------------------------------------------------------
Miscellaneous notes on the initial patch, which are also subject to change:
1. no test code is present in SDL, yet. This should, perhaps, change. Initial development was done with an ImGui-based app, which potentially is too thick for use in SDL-official. If tests are to be added, what kind of tests? Automated? Graphical?
2. virtual game controllers can be created by calling SDL_JoystickAttachVirtual with a joystick-type of SDL_JOYSTICK_TYPE_GAME_CONTROLLER, with naxes (num axes) set to SDL_CONTROLLER_AXIS_MAX, and with nbuttons (num buttons) set to SDL_CONTROLLER_BUTTON_MAX. When updating their state, values of type SDL_GameControllerAxis or SDL_GameControllerButton can be casted to an int and used for the control-index (in calls to SDL_JoystickSetVirtual* functions).
3. virtual joysticks' guids are mostly all-zeros with the exception of the last two bytes, the first of which is a 'v', to indicate that the guid is a virtual one, and the second of which is a SDL_JoystickType that has been converted into a Uint8.
4. virtual joysticks are ONLY turned into virtual game-controllers if and when their joystick-type is set to SDL_JOYSTICK_TYPE_GAMECONTROLLER. This is controlled by having SDL's default list of game-controllers have a single entry for a virtual game controller (of guid, "00000000000000000000000000007601", which is subject to the guid-encoding described above).
5. regarding having to call SDL_JoystickUpdate, either directly or indirectly via SDL_PumpEvents or SDL_PollEvents, before new virtual-joystick state becomes active (as specified via SDL_JoystickSetVirtual* function-calls), this was done to match behavior found in SDL's other joystick drivers, almost all of which will only update SDL-state during SDL_JoystickUpdate.
6. the initial patch is based off of SDL 2.0.12
7. the virtual joystick subsystem is disabled by default. It should be possible to enable it by building with SDL_JOYSTICK_VIRTUAL=1
Questions, comments, suggestions, or bug reports very welcome!
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a8780c6a
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2020-01-16T20:49:25
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Updated copyright date for 2020
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46e1377d
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2019-12-20T20:12:03
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Automatically assign player indexes to game controllers, and allow changing the player index for game controllers and joysticks.
Added the functions SDL_JoystickFromPlayerIndex(), SDL_JoystickSetPlayerIndex(), SDL_GameControllerFromPlayerIndex(), and SDL_GameControllerSetPlayerIndex()
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5e13087b
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2019-01-04T22:01:14
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Updated copyright for 2019
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14329256
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2018-10-25T16:53:14
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Generalized the XInput user index into a player index
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9987ca69
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2018-10-25T12:54:42
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Added SDL_JoystickGetXInputUserIndex()
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d2042e1e
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2018-08-09T16:00:17
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Added HIDAPI joystick drivers for more consistent support for Xbox, PS4 and Nintendo Switch Pro controller support across platforms.
Added SDL_GameControllerRumble() and SDL_JoystickRumble() for simple force feedback outside of the SDL haptics API
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e3cc5b2c
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2018-01-03T10:03:25
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Updated copyright for 2018
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d90fce3c
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2017-10-10T11:10:15
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Exposed the joystick locking functions for multi-threaded access to the joystick API
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763e1389
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2017-03-09T16:09:16
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Added an API to get the joystick instance ID before opening the device: SDL_JoystickGetDeviceInstanceID()
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3f83fce7
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2017-01-31T13:30:35
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Fixed whitespace
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6717a3d3
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2017-01-31T12:23:29
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Added support for the HOTAS Warthog throttle
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4e3fa7b9
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2017-01-30T22:20:20
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Fixed compiler warning about comma at end of enum.
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3c90a52a
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2017-01-27T05:59:58
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Added an API to get the type of a connected joystick
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4938c505
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2017-01-04T10:28:07
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Added SDL_JoystickGetAxisInitialState() to get a joystick axis' initial value.
This is useful for controller mapping programs to determine an axis' zero state
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45b774e3
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2017-01-01T18:33:28
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Updated copyright for 2017
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6d7da088
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2016-12-27T01:39:07
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Split controller axes into positive and negative sides so each can be bound independently.
Using this a D-Pad can be mapped to a thumbstick and vice versa.
Also added support for inverted axes, improving trigger binding support
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36156335
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2016-11-20T21:34:54
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Renaming of guard header names to quiet -Wreserved-id-macro
Patch contributed by Sylvain
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c7351c2d
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2016-11-20T21:26:56
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Fixed a few warnings that show up with -Wdocumentation and -Wdocumentation-unknown-command, patch contributed by Sylvain
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ac74e16c
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2016-11-10T17:19:34
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Standardized the format of the SDL joystick GUID and added functions to retrieve the USB VID/PID from a joystick and game controller.
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a4abda0b
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2016-08-03T22:30:31
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Added brackets to function names in header comments so that doxygen links them.
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42065e78
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2016-01-02T10:10:34
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Updated copyright to 2016
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f09d3750
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2015-11-14T14:53:44
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Minor whitespace fix.
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e6ad29ae
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2015-11-14T12:35:45
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Added SDL_JoystickFromInstanceID() and SDL_GameControllerFromInstanceID().
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a0c4b56f
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2015-09-30T15:39:30
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SDL - added new SDL_JoystickCurrentPowerLevel() API that returns the battery level of the selected joystick. Currently only implemented for XInput devices, other platforms are a TODO.
CR: Sam
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a955bec4
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2015-07-16T21:48:35
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Fixed spaces in header file.
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0e45984f
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2015-06-21T17:33:46
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Fixed crash if initialization of EGL failed but was tried again later.
The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly
uninitialized data structure if loading the library first failed. A later try to
use EGL then skipped initialization and assumed it was previously successful
because the data structure now already existed. This led to at least one crash
in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was
dereferenced to make a call to eglBindAPI().
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2c4a6ea0
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2015-05-26T06:27:46
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Updated the copyright year to 2015
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71c65b15
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2015-04-20T20:03:40
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Fixed SDL_GameControllerOpen() and SDL_JoystickOpen() documentation in header.
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b72938c8
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2015-04-20T12:22:44
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Windows: Always set the system timer resolution to 1ms by default.
An existing hint lets apps that don't need the timer resolution changed avoid
this, to save battery, etc, but this fixes several problems in timing, audio
callbacks not firing fast enough, etc.
Fixes Bugzilla #2944.
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fe6c797c
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2015-04-10T23:30:31
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Fixed an iOS view orientation issue when SDL_GL_CreateContext or SDL_CreateRenderer is called.
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b88ca1b4
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2015-02-10T16:28:56
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the last parameter of XChangeProperty is the number of elements.. and when the element format is 32.. the element is "long" so we have 5 long elements here.
Yes this seems confusing as on mac+linux Long is either 32 or 64bits depending on the architecture, but this is how the X11 protocol is defined. Thus 5 is the correct value for the nelts here. Not 5 or 10 depending on the architecture.
More info on the confusion https://bugs.freedesktop.org/show_bug.cgi?id=16802
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b48e54aa
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2015-01-26T22:00:29
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Fixed bug 2802 - [patch] Fix android build compiling in wrong filesystem implementation
Jonas Kulla
The configure script didn't differentiate between Linux and Android, unconditionally compiling in the unix implementation of SDL_sysfilesystem.c.
I'm probably one of the very few people building SDL for android using classic configure + standalone toolchain, so this has gone undetected all along.
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70438be2
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2014-12-03T10:55:23
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WinRT: fixed bug whereby SDL would override an app's default orientation
WinRT apps can set a default, preferred orientation via a .appxmanifest file.
SDL was overriding this on app startup, and making the app use all possible
orientations (landscape and portrait).
Thanks to Eric Wing for the heads up on this!
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a690944e
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2014-11-23T11:26:46
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Fixed typo in header file documentation comment.
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9c398852
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2014-11-22T22:20:40
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Corrected header file documentation comment.
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24c86b55
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2014-09-11T19:24:42
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[X11] Reconcile logical keyboard state with physical state on FocusIn
since the window system doesn't do it for us like other platforms.
This prevents sticky keys and missed keys when going in and out
of focus, for example Alt would appear to stick if switching away
from an SDL app with Alt-Tab and had to be pressed again.
CR: Sam
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3dcb451f
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2014-04-09T21:29:19
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Added a README file regarding WinRT support
To note, this file is currently formatted with CRLF line endings, rather than
LF, to allow the file to be viewed with Notepad.
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58edac3e
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2014-02-02T00:53:27
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Fixed bug 2374 - Update copyright for 2014...
Is it that time already??
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f848adff
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2013-11-29T10:06:08
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Improve Android pause/resume behavior.
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e9af6dcd
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2013-11-23T15:52:49
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Fixed a few public APIs that we accidentally neglected to mark as SDLCALL.
Fixes Bugzilla #2262.
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1e49b1ed
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2013-08-21T09:47:10
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OCD fixes: Adds a space after /* (glory to regular expressions!)
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695344d1
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2013-08-21T09:43:09
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OCD fixes: Adds a space before */
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dad42067
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2013-08-12T11:13:50
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Fixes #2022, do not resume on Android when surfaceChanged
If the app is in landscape mode and the user presses the power button, a pause
is followed immediately by a surfaceChanged event because the lock screen
is shown in portrait mode. This triggers a "false" resume.
So, we just pause and resume following the onWindowFocusChanged events.
Also, wait for SDL_APP_WILLENTERBACKGROUND and SDL_APP_DIDENTERBACKGROUND before
blocking the event pump.
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1ad936eb
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2013-08-11T19:56:43
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Fixed bug 2027 - Full-screen appears to be broken - hang in SDL_DestroyWindow()
Rainer Deyke
I'm running Linux Mint 15 with the Cinnamon window manager. SDL_DestroyWindow consistently locks up for me when the window if fullscreen.
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