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SDL_joystick.c
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/*
Simple DirectMedia Layer
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Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../SDL_internal.h"
/* This is the joystick API for Simple DirectMedia Layer */
#include "SDL.h"
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#include "SDL_atomic.h"
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#include "SDL_events.h"
#include "SDL_sysjoystick.h"
#include "SDL_assert.h"
#include "SDL_hints.h"
#if !SDL_EVENTS_DISABLED
#include "../events/SDL_events_c.h"
#endif
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#include "../video/SDL_sysvideo.h"
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#include "hidapi/SDL_hidapijoystick_c.h"
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/* This is included in only one place because it has a large static list of controllers */
#include "controller_type.h"
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#ifdef __WIN32__
/* Needed for checking for input remapping programs */
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#include "../core/windows/SDL_windows.h"
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#undef UNICODE /* We want ASCII functions */
#include <tlhelp32.h>
#endif
static SDL_JoystickDriver *SDL_joystick_drivers[] = {
#if defined(SDL_JOYSTICK_DINPUT) || defined(SDL_JOYSTICK_XINPUT)
&SDL_WINDOWS_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_LINUX
&SDL_LINUX_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_IOKIT
&SDL_DARWIN_JoystickDriver,
#endif
#if defined(__IPHONEOS__) || defined(__TVOS__)
&SDL_IOS_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_ANDROID
&SDL_ANDROID_JoystickDriver,
#endif
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#ifdef SDL_JOYSTICK_EMSCRIPTEN
&SDL_EMSCRIPTEN_JoystickDriver,
#endif
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#ifdef SDL_JOYSTICK_HAIKU
&SDL_HAIKU_JoystickDriver,
#endif
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#ifdef SDL_JOYSTICK_USBHID /* !!! FIXME: "USBHID" is a generic name, and doubly-confusing with HIDAPI next to it. This is the *BSD interface, rename this. */
&SDL_BSD_JoystickDriver,
#endif
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#ifdef SDL_JOYSTICK_HIDAPI
&SDL_HIDAPI_JoystickDriver,
#endif
#if defined(SDL_JOYSTICK_DUMMY) || defined(SDL_JOYSTICK_DISABLED)
&SDL_DUMMY_JoystickDriver
#endif
};
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static SDL_bool SDL_joystick_allows_background_events = SDL_FALSE;
static SDL_Joystick *SDL_joysticks = NULL;
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static SDL_bool SDL_updating_joystick = SDL_FALSE;
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static SDL_mutex *SDL_joystick_lock = NULL; /* This needs to support recursive locks */
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static SDL_atomic_t SDL_next_joystick_instance_id;
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static int SDL_joystick_player_count = 0;
static SDL_JoystickID *SDL_joystick_players = NULL;
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void
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SDL_LockJoysticks(void)
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{
if (SDL_joystick_lock) {
SDL_LockMutex(SDL_joystick_lock);
}
}
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void
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SDL_UnlockJoysticks(void)
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{
if (SDL_joystick_lock) {
SDL_UnlockMutex(SDL_joystick_lock);
}
}
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static int
SDL_FindFreePlayerIndex()
{
int player_index;
for (player_index = 0; player_index < SDL_joystick_player_count; ++player_index) {
if (SDL_joystick_players[player_index] == -1) {
return player_index;
}
}
return player_index;
}
static int
SDL_GetPlayerIndexForJoystickID(SDL_JoystickID instance_id)
{
int player_index;
for (player_index = 0; player_index < SDL_joystick_player_count; ++player_index) {
if (instance_id == SDL_joystick_players[player_index]) {
break;
}
}
if (player_index == SDL_joystick_player_count) {
player_index = -1;
}
return player_index;
}
static SDL_JoystickID
SDL_GetJoystickIDForPlayerIndex(int player_index)
{
if (player_index < 0 || player_index >= SDL_joystick_player_count) {
return -1;
}
return SDL_joystick_players[player_index];
}
static SDL_bool
SDL_SetJoystickIDForPlayerIndex(int player_index, SDL_JoystickID instance_id)
{
SDL_JoystickID existing_instance = SDL_GetJoystickIDForPlayerIndex(player_index);
SDL_JoystickDriver *driver;
int device_index;
if (player_index < 0) {
return SDL_FALSE;
}
if (player_index >= SDL_joystick_player_count) {
SDL_JoystickID *new_players = (SDL_JoystickID *)SDL_realloc(SDL_joystick_players, (player_index + 1)*sizeof(*SDL_joystick_players));
if (!new_players) {
SDL_OutOfMemory();
return SDL_FALSE;
}
SDL_joystick_players = new_players;
while (SDL_joystick_player_count <= player_index) {
SDL_joystick_players[SDL_joystick_player_count++] = -1;
}
}
SDL_joystick_players[player_index] = instance_id;
/* Update the driver with the new index */
device_index = SDL_JoystickGetDeviceIndexFromInstanceID(instance_id);
if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
driver->SetDevicePlayerIndex(device_index, player_index);
}
/* Move any existing joystick to another slot */
if (existing_instance >= 0) {
SDL_SetJoystickIDForPlayerIndex(SDL_FindFreePlayerIndex(), existing_instance);
}
return SDL_TRUE;
}
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static void SDLCALL
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SDL_JoystickAllowBackgroundEventsChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
{
if (hint && *hint == '1') {
SDL_joystick_allows_background_events = SDL_TRUE;
} else {
SDL_joystick_allows_background_events = SDL_FALSE;
}
}
int
SDL_JoystickInit(void)
{
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int i, status;
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SDL_GameControllerInitMappings();
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/* Create the joystick list lock */
if (!SDL_joystick_lock) {
SDL_joystick_lock = SDL_CreateMutex();
}
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/* See if we should allow joystick events while in the background */
SDL_AddHintCallback(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS,
SDL_JoystickAllowBackgroundEventsChanged, NULL);
#if !SDL_EVENTS_DISABLED
if (SDL_InitSubSystem(SDL_INIT_EVENTS) < 0) {
return -1;
}
#endif /* !SDL_EVENTS_DISABLED */
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status = -1;
for (i = 0; i < SDL_arraysize(SDL_joystick_drivers); ++i) {
if (SDL_joystick_drivers[i]->Init() >= 0) {
status = 0;
}
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}
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return status;
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}
/*
* Count the number of joysticks attached to the system
*/
int
SDL_NumJoysticks(void)
{
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int i, total_joysticks = 0;
SDL_LockJoysticks();
for (i = 0; i < SDL_arraysize(SDL_joystick_drivers); ++i) {
total_joysticks += SDL_joystick_drivers[i]->GetCount();
}
SDL_UnlockJoysticks();
return total_joysticks;
}
/*
* Return the next available joystick instance ID
* This may be called by drivers from multiple threads, unprotected by any locks
*/
SDL_JoystickID SDL_GetNextJoystickInstanceID()
{
return SDL_AtomicIncRef(&SDL_next_joystick_instance_id);
}
/*
* Get the driver and device index for an API device index
* This should be called while the joystick lock is held, to prevent another thread from updating the list
*/
SDL_bool
SDL_GetDriverAndJoystickIndex(int device_index, SDL_JoystickDriver **driver, int *driver_index)
{
int i, num_joysticks, total_joysticks = 0;
if (device_index >= 0) {
for (i = 0; i < SDL_arraysize(SDL_joystick_drivers); ++i) {
num_joysticks = SDL_joystick_drivers[i]->GetCount();
if (device_index < num_joysticks) {
*driver = SDL_joystick_drivers[i];
*driver_index = device_index;
return SDL_TRUE;
}
device_index -= num_joysticks;
total_joysticks += num_joysticks;
}
}
SDL_SetError("There are %d joysticks available", total_joysticks);
return SDL_FALSE;
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}
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/*
* Perform any needed fixups for joystick names
*/
static const char *
SDL_FixupJoystickName(const char *name)
{
if (name) {
const char *skip_prefix = "NVIDIA Corporation ";
if (SDL_strncmp(name, skip_prefix, SDL_strlen(skip_prefix)) == 0) {
name += SDL_strlen(skip_prefix);
}
}
return name;
}
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/*
* Get the implementation dependent name of a joystick
*/
const char *
SDL_JoystickNameForIndex(int device_index)
{
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SDL_JoystickDriver *driver;
const char *name = NULL;
SDL_LockJoysticks();
if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
name = SDL_FixupJoystickName(driver->GetDeviceName(device_index));
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}
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SDL_UnlockJoysticks();
/* FIXME: Really we should reference count this name so it doesn't go away after unlock */
return name;
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}
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/*
* Get the player index of a joystick, or -1 if it's not available
*/
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int
SDL_JoystickGetDevicePlayerIndex(int device_index)
{
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int player_index;
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SDL_LockJoysticks();
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player_index = SDL_GetPlayerIndexForJoystickID(SDL_JoystickGetDeviceInstanceID(device_index));
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SDL_UnlockJoysticks();
return player_index;
}
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/*
* Return true if this joystick is known to have all axes centered at zero
* This isn't generally needed unless the joystick never generates an initial axis value near zero,
* e.g. it's emulating axes with digital buttons
*/
static SDL_bool
SDL_JoystickAxesCenteredAtZero(SDL_Joystick *joystick)
{
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static Uint32 zero_centered_joysticks[] = {
MAKE_VIDPID(0x0e8f, 0x3013), /* HuiJia SNES USB adapter */
MAKE_VIDPID(0x05a0, 0x3232), /* 8Bitdo Zero Gamepad */
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};
int i;
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Uint32 id = MAKE_VIDPID(SDL_JoystickGetVendor(joystick),
SDL_JoystickGetProduct(joystick));
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/*printf("JOYSTICK '%s' VID/PID 0x%.4x/0x%.4x AXES: %d\n", joystick->name, vendor, product, joystick->naxes);*/
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if (joystick->naxes == 2) {
/* Assume D-pad or thumbstick style axes are centered at 0 */
return SDL_TRUE;
}
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for (i = 0; i < SDL_arraysize(zero_centered_joysticks); ++i) {
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if (id == zero_centered_joysticks[i]) {
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return SDL_TRUE;
}
}
return SDL_FALSE;
}
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/*
* Open a joystick for use - the index passed as an argument refers to
* the N'th joystick on the system. This index is the value which will
* identify this joystick in future joystick events.
*
* This function returns a joystick identifier, or NULL if an error occurred.
*/
SDL_Joystick *
SDL_JoystickOpen(int device_index)
{
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SDL_JoystickDriver *driver;
SDL_JoystickID instance_id;
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SDL_Joystick *joystick;
SDL_Joystick *joysticklist;
const char *joystickname = NULL;
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SDL_LockJoysticks();
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if (!SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
SDL_UnlockJoysticks();
return NULL;
}
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joysticklist = SDL_joysticks;
/* If the joystick is already open, return it
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* it is important that we have a single joystick * for each instance id
*/
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instance_id = driver->GetDeviceInstanceID(device_index);
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while (joysticklist) {
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if (instance_id == joysticklist->instance_id) {
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joystick = joysticklist;
++joystick->ref_count;
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SDL_UnlockJoysticks();
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return joystick;
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}
joysticklist = joysticklist->next;
}
/* Create and initialize the joystick */
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joystick = (SDL_Joystick *) SDL_calloc(sizeof(*joystick), 1);
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if (joystick == NULL) {
SDL_OutOfMemory();
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SDL_UnlockJoysticks();
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return NULL;
}
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joystick->driver = driver;
joystick->instance_id = instance_id;
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joystick->attached = SDL_TRUE;
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joystick->epowerlevel = SDL_JOYSTICK_POWER_UNKNOWN;
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if (driver->Open(joystick, device_index) < 0) {
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SDL_free(joystick);
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SDL_UnlockJoysticks();
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return NULL;
}
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joystickname = driver->GetDeviceName(device_index);
if (joystickname) {
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joystick->name = SDL_strdup(joystickname);
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} else {
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joystick->name = NULL;
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}
joystick->guid = driver->GetDeviceGUID(device_index);
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if (joystick->naxes > 0) {
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joystick->axes = (SDL_JoystickAxisInfo *) SDL_calloc(joystick->naxes, sizeof(SDL_JoystickAxisInfo));
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}
if (joystick->nhats > 0) {
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joystick->hats = (Uint8 *) SDL_calloc(joystick->nhats, sizeof(Uint8));
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}
if (joystick->nballs > 0) {
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joystick->balls = (struct balldelta *) SDL_calloc(joystick->nballs, sizeof(*joystick->balls));
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}
if (joystick->nbuttons > 0) {
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joystick->buttons = (Uint8 *) SDL_calloc(joystick->nbuttons, sizeof(Uint8));
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}
if (((joystick->naxes > 0) && !joystick->axes)
|| ((joystick->nhats > 0) && !joystick->hats)
|| ((joystick->nballs > 0) && !joystick->balls)
|| ((joystick->nbuttons > 0) && !joystick->buttons)) {
SDL_OutOfMemory();
SDL_JoystickClose(joystick);
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SDL_UnlockJoysticks();
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return NULL;
}
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/* If this joystick is known to have all zero centered axes, skip the auto-centering code */
if (SDL_JoystickAxesCenteredAtZero(joystick)) {
int i;
for (i = 0; i < joystick->naxes; ++i) {
joystick->axes[i].has_initial_value = SDL_TRUE;
}
}
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joystick->is_game_controller = SDL_IsGameController(device_index);
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/* Add joystick to list */
++joystick->ref_count;
/* Link the joystick in the list */
joystick->next = SDL_joysticks;
SDL_joysticks = joystick;
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SDL_UnlockJoysticks();
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driver->Update(joystick);
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return joystick;
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}
/*
* Checks to make sure the joystick is valid.
*/
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SDL_bool
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SDL_PrivateJoystickValid(SDL_Joystick * joystick)
{
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SDL_bool valid;
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if (joystick == NULL) {
SDL_SetError("Joystick hasn't been opened yet");
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valid = SDL_FALSE;
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} else {
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valid = SDL_TRUE;
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}
return valid;
}
/*
* Get the number of multi-dimensional axis controls on a joystick
*/
int
SDL_JoystickNumAxes(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
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return -1;
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}
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return joystick->naxes;
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}
/*
* Get the number of hats on a joystick
*/
int
SDL_JoystickNumHats(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
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return -1;
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}
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return joystick->nhats;
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}
/*
* Get the number of trackballs on a joystick
*/
int
SDL_JoystickNumBalls(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
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return -1;
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}
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return joystick->nballs;
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}
/*
* Get the number of buttons on a joystick
*/
int
SDL_JoystickNumButtons(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
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return -1;
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}
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return joystick->nbuttons;
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}
/*
* Get the current state of an axis control on a joystick
*/
Sint16
SDL_JoystickGetAxis(SDL_Joystick * joystick, int axis)
{
Sint16 state;
if (!SDL_PrivateJoystickValid(joystick)) {
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return 0;
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}
if (axis < joystick->naxes) {
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state = joystick->axes[axis].value;
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} else {
SDL_SetError("Joystick only has %d axes", joystick->naxes);
state = 0;
}
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return state;
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}
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/*
* Get the initial state of an axis control on a joystick
*/
SDL_bool
SDL_JoystickGetAxisInitialState(SDL_Joystick * joystick, int axis, Sint16 *state)
{
if (!SDL_PrivateJoystickValid(joystick)) {
return SDL_FALSE;
}
if (axis >= joystick->naxes) {
SDL_SetError("Joystick only has %d axes", joystick->naxes);
return SDL_FALSE;
}
if (state) {
*state = joystick->axes[axis].initial_value;
}
return joystick->axes[axis].has_initial_value;
}
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/*
* Get the current state of a hat on a joystick
*/
Uint8
SDL_JoystickGetHat(SDL_Joystick * joystick, int hat)
{
Uint8 state;
if (!SDL_PrivateJoystickValid(joystick)) {
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return 0;
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}
if (hat < joystick->nhats) {
state = joystick->hats[hat];
} else {
SDL_SetError("Joystick only has %d hats", joystick->nhats);
state = 0;
}
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return state;
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}
/*
* Get the ball axis change since the last poll
*/
int
SDL_JoystickGetBall(SDL_Joystick * joystick, int ball, int *dx, int *dy)
{
int retval;
if (!SDL_PrivateJoystickValid(joystick)) {
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return -1;
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}
retval = 0;
if (ball < joystick->nballs) {
if (dx) {
*dx = joystick->balls[ball].dx;
}
if (dy) {
*dy = joystick->balls[ball].dy;
}
joystick->balls[ball].dx = 0;
joystick->balls[ball].dy = 0;
} else {
return SDL_SetError("Joystick only has %d balls", joystick->nballs);
}
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return retval;
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}
/*
* Get the current state of a button on a joystick
*/
Uint8
SDL_JoystickGetButton(SDL_Joystick * joystick, int button)
{
Uint8 state;
if (!SDL_PrivateJoystickValid(joystick)) {
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return 0;
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}
if (button < joystick->nbuttons) {
state = joystick->buttons[button];
} else {
SDL_SetError("Joystick only has %d buttons", joystick->nbuttons);
state = 0;
}
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return state;
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}
/*
* Return if the joystick in question is currently attached to the system,
* \return SDL_FALSE if not plugged in, SDL_TRUE if still present.
*/
SDL_bool
SDL_JoystickGetAttached(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
return SDL_FALSE;
}
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return joystick->attached;
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}
/*
* Get the instance id for this opened joystick
*/
SDL_JoystickID
SDL_JoystickInstanceID(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
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return -1;
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}
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return joystick->instance_id;
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}
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/*
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* Return the SDL_Joystick associated with an instance id.
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*/
SDL_Joystick *
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SDL_JoystickFromInstanceID(SDL_JoystickID instance_id)
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{
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SDL_Joystick *joystick;
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SDL_LockJoysticks();
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for (joystick = SDL_joysticks; joystick; joystick = joystick->next) {
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if (joystick->instance_id == instance_id) {
break;
}
}
SDL_UnlockJoysticks();
return joystick;
}
/**
* Return the SDL_Joystick associated with a player index.
*/
SDL_Joystick *
SDL_JoystickFromPlayerIndex(int player_index)
{
SDL_JoystickID instance_id;
SDL_Joystick *joystick;
SDL_LockJoysticks();
instance_id = SDL_GetJoystickIDForPlayerIndex(player_index);
for (joystick = SDL_joysticks; joystick; joystick = joystick->next) {
if (joystick->instance_id == instance_id) {
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break;
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}
}
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SDL_UnlockJoysticks();
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return joystick;
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}
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/*
* Get the friendly name of this joystick
*/
const char *
SDL_JoystickName(SDL_Joystick * joystick)
{
if (!SDL_PrivateJoystickValid(joystick)) {
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return NULL;
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}
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return SDL_FixupJoystickName(joystick->name);
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}
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/**
* Get the player index of an opened joystick, or -1 if it's not available
*/
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int
SDL_JoystickGetPlayerIndex(SDL_Joystick * joystick)
{
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int player_index;
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if (!SDL_PrivateJoystickValid(joystick)) {
return -1;
}
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SDL_LockJoysticks();
player_index = SDL_GetPlayerIndexForJoystickID(joystick->instance_id);
SDL_UnlockJoysticks();
return player_index;
}
/**
* Set the player index of an opened joystick
*/
void
SDL_JoystickSetPlayerIndex(SDL_Joystick * joystick, int player_index)
{
if (!SDL_PrivateJoystickValid(joystick)) {
return;
}
SDL_LockJoysticks();
SDL_SetJoystickIDForPlayerIndex(player_index, joystick->instance_id);
SDL_UnlockJoysticks();
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}
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int
SDL_JoystickRumble(SDL_Joystick * joystick, Uint16 low_frequency_rumble, Uint16 high_frequency_rumble, Uint32 duration_ms)
{
if (!SDL_PrivateJoystickValid(joystick)) {
return -1;
}
return joystick->driver->Rumble(joystick, low_frequency_rumble, high_frequency_rumble, duration_ms);
}
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/*
* Close a joystick previously opened with SDL_JoystickOpen()
*/
void
SDL_JoystickClose(SDL_Joystick * joystick)
{
SDL_Joystick *joysticklist;
SDL_Joystick *joysticklistprev;
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if (!SDL_PrivateJoystickValid(joystick)) {
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return;
}
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SDL_LockJoysticks();
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/* First decrement ref count */
if (--joystick->ref_count > 0) {
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SDL_UnlockJoysticks();
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return;
}
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if (SDL_updating_joystick) {
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SDL_UnlockJoysticks();
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return;
}
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joystick->driver->Close(joystick);
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joystick->hwdata = NULL;
joysticklist = SDL_joysticks;
joysticklistprev = NULL;
while (joysticklist) {
if (joystick == joysticklist) {
if (joysticklistprev) {
/* unlink this entry */
joysticklistprev->next = joysticklist->next;
} else {
SDL_joysticks = joystick->next;
}
break;
}
joysticklistprev = joysticklist;
joysticklist = joysticklist->next;
}
SDL_free(joystick->name);
/* Free the data associated with this joystick */
SDL_free(joystick->axes);
SDL_free(joystick->hats);
SDL_free(joystick->balls);
SDL_free(joystick->buttons);
SDL_free(joystick);
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SDL_UnlockJoysticks();
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}
void
SDL_JoystickQuit(void)
{
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int i;
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/* Make sure we're not getting called in the middle of updating joysticks */
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SDL_LockJoysticks();
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while (SDL_updating_joystick) {
SDL_UnlockJoysticks();
SDL_Delay(1);
SDL_LockJoysticks();
}
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/* Stop the event polling */
while (SDL_joysticks) {
SDL_joysticks->ref_count = 1;
SDL_JoystickClose(SDL_joysticks);
}
/* Quit the joystick setup */
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for (i = 0; i < SDL_arraysize(SDL_joystick_drivers); ++i) {
SDL_joystick_drivers[i]->Quit();
}
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if (SDL_joystick_players) {
SDL_free(SDL_joystick_players);
SDL_joystick_players = NULL;
SDL_joystick_player_count = 0;
}
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SDL_UnlockJoysticks();
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#if !SDL_EVENTS_DISABLED
SDL_QuitSubSystem(SDL_INIT_EVENTS);
#endif
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SDL_DelHintCallback(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS,
SDL_JoystickAllowBackgroundEventsChanged, NULL);
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if (SDL_joystick_lock) {
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SDL_mutex *mutex = SDL_joystick_lock;
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SDL_joystick_lock = NULL;
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SDL_DestroyMutex(mutex);
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}
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SDL_GameControllerQuitMappings();
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}
static SDL_bool
SDL_PrivateJoystickShouldIgnoreEvent()
{
if (SDL_joystick_allows_background_events) {
return SDL_FALSE;
}
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if (SDL_HasWindows() && SDL_GetKeyboardFocus() == NULL) {
/* We have windows but we don't have focus, ignore the event. */
return SDL_TRUE;
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}
return SDL_FALSE;
}
/* These are global for SDL_sysjoystick.c and SDL_events.c */
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void SDL_PrivateJoystickAdded(SDL_JoystickID device_instance)
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{
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SDL_JoystickDriver *driver;
int driver_device_index;
int player_index = -1;
int device_index = SDL_JoystickGetDeviceIndexFromInstanceID(device_instance);
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if (device_index < 0) {
return;
}
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SDL_LockJoysticks();
if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &driver_device_index)) {
player_index = driver->GetDevicePlayerIndex(driver_device_index);
}
if (player_index < 0 && SDL_IsGameController(device_index)) {
player_index = SDL_FindFreePlayerIndex();
}
if (player_index >= 0) {
SDL_SetJoystickIDForPlayerIndex(player_index, device_instance);
}
SDL_UnlockJoysticks();
#if !SDL_EVENTS_DISABLED
{
SDL_Event event;
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event.type = SDL_JOYDEVICEADDED;
if (SDL_GetEventState(event.type) == SDL_ENABLE) {
event.jdevice.which = device_index;
SDL_PushEvent(&event);
}
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}
#endif /* !SDL_EVENTS_DISABLED */
}
/*
* If there is an existing add event in the queue, it needs to be modified
* to have the right value for which, because the number of controllers in
* the system is now one less.
*/
static void UpdateEventsForDeviceRemoval()
{
int i, num_events;
SDL_Event *events;
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SDL_bool isstack;
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num_events = SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, SDL_JOYDEVICEADDED, SDL_JOYDEVICEADDED);
if (num_events <= 0) {
return;
}
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events = SDL_small_alloc(SDL_Event, num_events, &isstack);
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if (!events) {
return;
}
num_events = SDL_PeepEvents(events, num_events, SDL_GETEVENT, SDL_JOYDEVICEADDED, SDL_JOYDEVICEADDED);
for (i = 0; i < num_events; ++i) {
--events[i].jdevice.which;
}
SDL_PeepEvents(events, num_events, SDL_ADDEVENT, 0, 0);
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SDL_small_free(events, isstack);
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}
void SDL_PrivateJoystickRemoved(SDL_JoystickID device_instance)
{
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SDL_Joystick *joystick;
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#if !SDL_EVENTS_DISABLED
SDL_Event event;
event.type = SDL_JOYDEVICEREMOVED;
if (SDL_GetEventState(event.type) == SDL_ENABLE) {
event.jdevice.which = device_instance;
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SDL_PushEvent(&event);
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}
UpdateEventsForDeviceRemoval();
#endif /* !SDL_EVENTS_DISABLED */
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/* Mark this joystick as no longer attached */
for (joystick = SDL_joysticks; joystick; joystick = joystick->next) {
if (joystick->instance_id == device_instance) {
joystick->attached = SDL_FALSE;
joystick->force_recentering = SDL_TRUE;
break;
}
}
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}
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int
SDL_PrivateJoystickAxis(SDL_Joystick * joystick, Uint8 axis, Sint16 value)
{
int posted;
979
SDL_JoystickAxisInfo *info;
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/* Make sure we're not getting garbage or duplicate events */
if (axis >= joystick->naxes) {
return 0;
}
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info = &joystick->axes[axis];
if (!info->has_initial_value ||
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(!info->has_second_value && (info->initial_value == -32768 || info->initial_value == 32767) && SDL_abs(value) < (SDL_JOYSTICK_AXIS_MAX / 4))) {
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info->initial_value = value;
info->value = value;
info->zero = value;
info->has_initial_value = SDL_TRUE;
} else {
info->has_second_value = SDL_TRUE;
995
}
996
if (value == info->value) {
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return 0;
}
999
if (!info->sent_initial_value) {
1000
/* Make sure we don't send motion until there's real activity on this axis */