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3229 lines (2735 loc) · 96.8 KB
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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"
#include "SDL_atomic.h"
#include "SDL_events.h"
#include "SDL_sysjoystick.h"
#include "SDL_hints.h"
#include "../SDL_hints_c.h"
#ifndef SDL_EVENTS_DISABLED
#include "../events/SDL_events_c.h"
#endif
#include "../video/SDL_sysvideo.h"
#include "hidapi/SDL_hidapijoystick_c.h"
/* This is included in only one place because it has a large static list of controllers */
#include "controller_type.h"
#if defined(__WIN32__) || defined(__WINGDK__)
/* Needed for checking for input remapping programs */
#include "../core/windows/SDL_windows.h"
#undef UNICODE /* We want ASCII functions */
#include <tlhelp32.h>
#endif
#ifdef SDL_JOYSTICK_VIRTUAL
#include "./virtual/SDL_virtualjoystick_c.h"
#endif
static SDL_JoystickDriver *SDL_joystick_drivers[] = {
#ifdef SDL_JOYSTICK_HIDAPI /* Before WINDOWS_ driver, as WINDOWS wants to check if this driver is handling things */
&SDL_HIDAPI_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_RAWINPUT /* Before WINDOWS_ driver, as WINDOWS wants to check if this driver is handling things */
&SDL_RAWINPUT_JoystickDriver,
#endif
#if defined(SDL_JOYSTICK_DINPUT) || defined(SDL_JOYSTICK_XINPUT) /* Before WGI driver, as WGI wants to check if this driver is handling things */
&SDL_WINDOWS_JoystickDriver,
#endif
#if defined(SDL_JOYSTICK_WGI)
&SDL_WGI_JoystickDriver,
#endif
#if defined(SDL_JOYSTICK_WINMM)
&SDL_WINMM_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_LINUX
&SDL_LINUX_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_IOKIT
&SDL_DARWIN_JoystickDriver,
#endif
#if (defined(__MACOSX__) || defined(__IPHONEOS__) || defined(__TVOS__)) && !defined(SDL_JOYSTICK_DISABLED)
&SDL_IOS_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_ANDROID
&SDL_ANDROID_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_EMSCRIPTEN
&SDL_EMSCRIPTEN_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_HAIKU
&SDL_HAIKU_JoystickDriver,
#endif
#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
#ifdef SDL_JOYSTICK_OS2
&SDL_OS2_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_PS2
&SDL_PS2_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_PSP
&SDL_PSP_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_VIRTUAL
&SDL_VIRTUAL_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_VITA
&SDL_VITA_JoystickDriver,
#endif
#ifdef SDL_JOYSTICK_N3DS
&SDL_N3DS_JoystickDriver
#endif
#if defined(SDL_JOYSTICK_DUMMY) || defined(SDL_JOYSTICK_DISABLED)
&SDL_DUMMY_JoystickDriver
#endif
};
#ifndef SDL_THREAD_SAFETY_ANALYSIS
static
#endif
SDL_mutex *SDL_joystick_lock = NULL; /* This needs to support recursive locks */
static SDL_atomic_t SDL_joystick_lock_pending;
static int SDL_joysticks_locked;
static SDL_bool SDL_joysticks_initialized;
static SDL_bool SDL_joysticks_quitting = SDL_FALSE;
static SDL_Joystick *SDL_joysticks SDL_GUARDED_BY(SDL_joystick_lock) = NULL;
static SDL_atomic_t SDL_next_joystick_instance_id SDL_GUARDED_BY(SDL_joystick_lock);
static int SDL_joystick_player_count SDL_GUARDED_BY(SDL_joystick_lock) = 0;
static SDL_JoystickID *SDL_joystick_players SDL_GUARDED_BY(SDL_joystick_lock) = NULL;
static SDL_bool SDL_joystick_allows_background_events = SDL_FALSE;
char SDL_joystick_magic;
#define CHECK_JOYSTICK_MAGIC(joystick, retval) \
if (!joystick || joystick->magic != &SDL_joystick_magic) { \
SDL_InvalidParamError("joystick"); \
SDL_UnlockJoysticks(); \
return retval; \
}
SDL_bool SDL_JoysticksInitialized(void)
{
return SDL_joysticks_initialized;
}
SDL_bool SDL_JoysticksQuitting(void)
{
return SDL_joysticks_quitting;
}
void SDL_LockJoysticks(void)
{
(void)SDL_AtomicIncRef(&SDL_joystick_lock_pending);
SDL_LockMutex(SDL_joystick_lock);
(void)SDL_AtomicDecRef(&SDL_joystick_lock_pending);
++SDL_joysticks_locked;
}
void SDL_UnlockJoysticks(void)
{
SDL_mutex *joystick_lock = SDL_joystick_lock;
SDL_bool last_unlock = SDL_FALSE;
--SDL_joysticks_locked;
if (!SDL_joysticks_initialized) {
if (!SDL_joysticks_locked && SDL_AtomicGet(&SDL_joystick_lock_pending) == 0) {
/* NOTE: There's a small window here where another thread could lock the mutex */
SDL_joystick_lock = NULL;
last_unlock = SDL_TRUE;
}
}
SDL_UnlockMutex(joystick_lock);
/* The last unlock after joysticks are uninitialized will cleanup the mutex,
* allowing applications to lock joysticks while reinitializing the system.
*/
if (last_unlock) {
SDL_DestroyMutex(joystick_lock);
}
}
SDL_bool SDL_JoysticksLocked(void)
{
return (SDL_joysticks_locked > 0) ? SDL_TRUE : SDL_FALSE;
}
void SDL_AssertJoysticksLocked(void)
{
SDL_assert(SDL_JoysticksLocked());
}
/*
* 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
*/
static SDL_bool SDL_GetDriverAndJoystickIndex(int device_index, SDL_JoystickDriver **driver, int *driver_index)
{
int i, num_joysticks, total_joysticks = 0;
SDL_AssertJoysticksLocked();
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;
}
static int SDL_FindFreePlayerIndex()
{
int player_index;
SDL_AssertJoysticksLocked();
for (player_index = 0; player_index < SDL_joystick_player_count; ++player_index) {
if (SDL_joystick_players[player_index] == -1) {
break;
}
}
return player_index;
}
static int SDL_GetPlayerIndexForJoystickID(SDL_JoystickID instance_id)
{
int player_index;
SDL_AssertJoysticksLocked();
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)
{
SDL_AssertJoysticksLocked();
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;
int existing_player_index;
SDL_AssertJoysticksLocked();
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;
SDL_memset(&SDL_joystick_players[SDL_joystick_player_count], 0xFF, (player_index - SDL_joystick_player_count + 1) * sizeof(SDL_joystick_players[0]));
SDL_joystick_player_count = player_index + 1;
} else if (player_index >= 0 && SDL_joystick_players[player_index] == instance_id) {
/* Joystick is already assigned the requested player index */
return SDL_TRUE;
}
/* Clear the old player index */
existing_player_index = SDL_GetPlayerIndexForJoystickID(instance_id);
if (existing_player_index >= 0) {
SDL_joystick_players[existing_player_index] = -1;
}
if (player_index >= 0) {
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;
}
static void SDLCALL SDL_JoystickAllowBackgroundEventsChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
{
if (SDL_GetStringBoolean(hint, SDL_FALSE)) {
SDL_joystick_allows_background_events = SDL_TRUE;
} else {
SDL_joystick_allows_background_events = SDL_FALSE;
}
}
int SDL_JoystickInit(void)
{
int i, status;
/* Create the joystick list lock */
if (SDL_joystick_lock == NULL) {
SDL_joystick_lock = SDL_CreateMutex();
}
#ifndef SDL_EVENTS_DISABLED
if (SDL_InitSubSystem(SDL_INIT_EVENTS) < 0) {
return -1;
}
#endif /* !SDL_EVENTS_DISABLED */
SDL_LockJoysticks();
SDL_joysticks_initialized = SDL_TRUE;
SDL_GameControllerInitMappings();
/* See if we should allow joystick events while in the background */
SDL_AddHintCallback(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS,
SDL_JoystickAllowBackgroundEventsChanged, NULL);
status = -1;
for (i = 0; i < SDL_arraysize(SDL_joystick_drivers); ++i) {
if (SDL_joystick_drivers[i]->Init() >= 0) {
status = 0;
}
}
SDL_UnlockJoysticks();
if (status < 0) {
SDL_JoystickQuit();
}
return status;
}
/*
* Count the number of joysticks attached to the system
*/
int SDL_NumJoysticks(void)
{
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 implementation dependent name of a joystick
*/
const char *SDL_JoystickNameForIndex(int device_index)
{
SDL_JoystickDriver *driver;
const char *name = NULL;
SDL_LockJoysticks();
if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
name = driver->GetDeviceName(device_index);
}
SDL_UnlockJoysticks();
/* FIXME: Really we should reference count this name so it doesn't go away after unlock */
return name;
}
/*
* Get the implementation dependent path of a joystick
*/
const char *SDL_JoystickPathForIndex(int device_index)
{
SDL_JoystickDriver *driver;
const char *path = NULL;
SDL_LockJoysticks();
if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
path = driver->GetDevicePath(device_index);
}
SDL_UnlockJoysticks();
/* FIXME: Really we should reference count this path so it doesn't go away after unlock */
if (!path) {
SDL_Unsupported();
}
return path;
}
/*
* Get the player index of a joystick, or -1 if it's not available
*/
int SDL_JoystickGetDevicePlayerIndex(int device_index)
{
int player_index;
SDL_LockJoysticks();
player_index = SDL_GetPlayerIndexForJoystickID(SDL_JoystickGetDeviceInstanceID(device_index));
SDL_UnlockJoysticks();
return player_index;
}
/*
* 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)
{
#ifdef __WINRT__
return SDL_TRUE;
#else
static Uint32 zero_centered_joysticks[] = {
MAKE_VIDPID(0x0e8f, 0x3013), /* HuiJia SNES USB adapter */
MAKE_VIDPID(0x05a0, 0x3232), /* 8Bitdo Zero Gamepad */
};
SDL_bool retval = SDL_FALSE;
int i;
Uint32 id = MAKE_VIDPID(SDL_JoystickGetVendor(joystick),
SDL_JoystickGetProduct(joystick));
/*printf("JOYSTICK '%s' VID/PID 0x%.4x/0x%.4x AXES: %d\n", joystick->name, vendor, product, joystick->naxes);*/
SDL_LockJoysticks();
{
if (joystick->naxes == 2) {
/* Assume D-pad or thumbstick style axes are centered at 0 */
retval = SDL_TRUE;
}
for (i = 0; i < SDL_arraysize(zero_centered_joysticks); ++i) {
if (id == zero_centered_joysticks[i]) {
retval = SDL_TRUE;
break;
}
}
}
SDL_UnlockJoysticks();
return retval;
#endif /* __WINRT__ */
}
/*
* 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)
{
SDL_JoystickDriver *driver;
SDL_JoystickID instance_id;
SDL_Joystick *joystick;
SDL_Joystick *joysticklist;
const char *joystickname = NULL;
const char *joystickpath = NULL;
SDL_JoystickPowerLevel initial_power_level;
SDL_LockJoysticks();
if (!SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
SDL_UnlockJoysticks();
return NULL;
}
joysticklist = SDL_joysticks;
/* If the joystick is already open, return it
* it is important that we have a single joystick * for each instance id
*/
instance_id = driver->GetDeviceInstanceID(device_index);
while (joysticklist) {
if (instance_id == joysticklist->instance_id) {
joystick = joysticklist;
++joystick->ref_count;
SDL_UnlockJoysticks();
return joystick;
}
joysticklist = joysticklist->next;
}
/* Create and initialize the joystick */
joystick = (SDL_Joystick *)SDL_calloc(sizeof(*joystick), 1);
if (!joystick) {
SDL_OutOfMemory();
SDL_UnlockJoysticks();
return NULL;
}
joystick->magic = &SDL_joystick_magic;
joystick->driver = driver;
joystick->instance_id = instance_id;
joystick->attached = SDL_TRUE;
joystick->epowerlevel = SDL_JOYSTICK_POWER_UNKNOWN;
joystick->led_expiration = SDL_GetTicks();
if (driver->Open(joystick, device_index) < 0) {
SDL_free(joystick);
SDL_UnlockJoysticks();
return NULL;
}
joystickname = driver->GetDeviceName(device_index);
if (joystickname) {
joystick->name = SDL_strdup(joystickname);
} else {
joystick->name = NULL;
}
joystickpath = driver->GetDevicePath(device_index);
if (joystickpath) {
joystick->path = SDL_strdup(joystickpath);
} else {
joystick->path = NULL;
}
joystick->guid = driver->GetDeviceGUID(device_index);
if (joystick->naxes > 0) {
joystick->axes = (SDL_JoystickAxisInfo *)SDL_calloc(joystick->naxes, sizeof(SDL_JoystickAxisInfo));
}
if (joystick->nhats > 0) {
joystick->hats = (Uint8 *)SDL_calloc(joystick->nhats, sizeof(Uint8));
}
if (joystick->nballs > 0) {
joystick->balls = (struct balldelta *)SDL_calloc(joystick->nballs, sizeof(*joystick->balls));
}
if (joystick->nbuttons > 0) {
joystick->buttons = (Uint8 *)SDL_calloc(joystick->nbuttons, sizeof(Uint8));
}
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);
SDL_UnlockJoysticks();
return NULL;
}
/* 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;
}
}
joystick->is_game_controller = SDL_IsGameController(device_index);
/* Add joystick to list */
++joystick->ref_count;
/* Link the joystick in the list */
joystick->next = SDL_joysticks;
SDL_joysticks = joystick;
/* send initial battery event */
initial_power_level = joystick->epowerlevel;
joystick->epowerlevel = SDL_JOYSTICK_POWER_UNKNOWN;
SDL_PrivateJoystickBatteryLevel(joystick, initial_power_level);
driver->Update(joystick);
SDL_UnlockJoysticks();
return joystick;
}
int SDL_JoystickAttachVirtual(SDL_JoystickType type, int naxes, int nbuttons, int nhats)
{
SDL_VirtualJoystickDesc desc;
SDL_zero(desc);
desc.version = SDL_VIRTUAL_JOYSTICK_DESC_VERSION;
desc.type = (Uint16)type;
desc.naxes = (Uint16)naxes;
desc.nbuttons = (Uint16)nbuttons;
desc.nhats = (Uint16)nhats;
return SDL_JoystickAttachVirtualEx(&desc);
}
int SDL_JoystickAttachVirtualEx(const SDL_VirtualJoystickDesc *desc)
{
#ifdef SDL_JOYSTICK_VIRTUAL
int retval;
SDL_LockJoysticks();
retval = SDL_JoystickAttachVirtualInner(desc);
SDL_UnlockJoysticks();
return retval;
#else
return SDL_SetError("SDL not built with virtual-joystick support");
#endif
}
int SDL_JoystickDetachVirtual(int device_index)
{
#ifdef SDL_JOYSTICK_VIRTUAL
SDL_JoystickDriver *driver;
SDL_LockJoysticks();
if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
if (driver == &SDL_VIRTUAL_JoystickDriver) {
const int retval = SDL_JoystickDetachVirtualInner(device_index);
SDL_UnlockJoysticks();
return retval;
}
}
SDL_UnlockJoysticks();
return SDL_SetError("Virtual joystick not found at provided index");
#else
return SDL_SetError("SDL not built with virtual-joystick support");
#endif
}
SDL_bool SDL_JoystickIsVirtual(int device_index)
{
#ifdef SDL_JOYSTICK_VIRTUAL
SDL_JoystickDriver *driver;
int driver_device_index;
SDL_bool is_virtual = SDL_FALSE;
SDL_LockJoysticks();
if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &driver_device_index)) {
if (driver == &SDL_VIRTUAL_JoystickDriver) {
is_virtual = SDL_TRUE;
}
}
SDL_UnlockJoysticks();
return is_virtual;
#else
return SDL_FALSE;
#endif
}
int SDL_JoystickSetVirtualAxis(SDL_Joystick *joystick, int axis, Sint16 value)
{
int retval;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, -1);
#ifdef SDL_JOYSTICK_VIRTUAL
retval = SDL_JoystickSetVirtualAxisInner(joystick, axis, value);
#else
retval = SDL_SetError("SDL not built with virtual-joystick support");
#endif
}
SDL_UnlockJoysticks();
return retval;
}
int SDL_JoystickSetVirtualButton(SDL_Joystick *joystick, int button, Uint8 value)
{
int retval;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, -1);
#ifdef SDL_JOYSTICK_VIRTUAL
retval = SDL_JoystickSetVirtualButtonInner(joystick, button, value);
#else
retval = SDL_SetError("SDL not built with virtual-joystick support");
#endif
}
SDL_UnlockJoysticks();
return retval;
}
int SDL_JoystickSetVirtualHat(SDL_Joystick *joystick, int hat, Uint8 value)
{
int retval;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, -1);
#ifdef SDL_JOYSTICK_VIRTUAL
retval = SDL_JoystickSetVirtualHatInner(joystick, hat, value);
#else
retval = SDL_SetError("SDL not built with virtual-joystick support");
#endif
}
SDL_UnlockJoysticks();
return retval;
}
/*
* Checks to make sure the joystick is valid.
*/
SDL_bool SDL_PrivateJoystickValid(SDL_Joystick *joystick)
{
SDL_AssertJoysticksLocked();
return (joystick && joystick->magic == &SDL_joystick_magic);
}
SDL_bool SDL_PrivateJoystickGetAutoGamepadMapping(int device_index, SDL_GamepadMapping *out)
{
SDL_JoystickDriver *driver;
SDL_bool is_ok = SDL_FALSE;
SDL_LockJoysticks();
if (SDL_GetDriverAndJoystickIndex(device_index, &driver, &device_index)) {
is_ok = driver->GetGamepadMapping(device_index, out);
}
SDL_UnlockJoysticks();
return is_ok;
}
/*
* Get the number of multi-dimensional axis controls on a joystick
*/
int SDL_JoystickNumAxes(SDL_Joystick *joystick)
{
int retval;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, -1);
retval = joystick->naxes;
}
SDL_UnlockJoysticks();
return retval;
}
/*
* Get the number of hats on a joystick
*/
int SDL_JoystickNumHats(SDL_Joystick *joystick)
{
int retval;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, -1);
retval = joystick->nhats;
}
SDL_UnlockJoysticks();
return retval;
}
/*
* Get the number of trackballs on a joystick
*/
int SDL_JoystickNumBalls(SDL_Joystick *joystick)
{
int retval;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, -1);
retval = joystick->nballs;
}
SDL_UnlockJoysticks();
return retval;
}
/*
* Get the number of buttons on a joystick
*/
int SDL_JoystickNumButtons(SDL_Joystick *joystick)
{
int retval;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, -1);
retval = joystick->nbuttons;
}
SDL_UnlockJoysticks();
return retval;
}
/*
* Get the current state of an axis control on a joystick
*/
Sint16 SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis)
{
Sint16 state;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, 0);
if (axis < joystick->naxes) {
state = joystick->axes[axis].value;
} else {
SDL_SetError("Joystick only has %d axes", joystick->naxes);
state = 0;
}
}
SDL_UnlockJoysticks();
return state;
}
/*
* Get the initial state of an axis control on a joystick
*/
SDL_bool SDL_JoystickGetAxisInitialState(SDL_Joystick *joystick, int axis, Sint16 *state)
{
SDL_bool retval;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, SDL_FALSE);
if (axis >= joystick->naxes) {
SDL_SetError("Joystick only has %d axes", joystick->naxes);
retval = SDL_FALSE;
} else {
if (state) {
*state = joystick->axes[axis].initial_value;
}
retval = joystick->axes[axis].has_initial_value;
}
}
SDL_UnlockJoysticks();
return retval;
}
/*
* Get the current state of a hat on a joystick
*/
Uint8 SDL_JoystickGetHat(SDL_Joystick *joystick, int hat)
{
Uint8 state;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, 0);
if (hat < joystick->nhats) {
state = joystick->hats[hat];
} else {
SDL_SetError("Joystick only has %d hats", joystick->nhats);
state = 0;
}
}
SDL_UnlockJoysticks();
return state;
}
/*
* Get the ball axis change since the last poll
*/
int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy)
{
int retval;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, -1);
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;
retval = 0;
} else {
retval = SDL_SetError("Joystick only has %d balls", joystick->nballs);
}
}
SDL_UnlockJoysticks();
return retval;
}
/*
* Get the current state of a button on a joystick
*/
Uint8 SDL_JoystickGetButton(SDL_Joystick *joystick, int button)
{
Uint8 state;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, 0);
if (button < joystick->nbuttons) {
state = joystick->buttons[button];
} else {
SDL_SetError("Joystick only has %d buttons", joystick->nbuttons);
state = 0;
}
}
SDL_UnlockJoysticks();
return state;
}
/*
* 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)
{
SDL_bool retval;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, SDL_FALSE);
retval = joystick->attached;
}
SDL_UnlockJoysticks();
return retval;
}
/*
* Get the instance id for this opened joystick
*/
SDL_JoystickID SDL_JoystickInstanceID(SDL_Joystick *joystick)
{
SDL_JoystickID retval;
SDL_LockJoysticks();
{
CHECK_JOYSTICK_MAGIC(joystick, -1);
retval = joystick->instance_id;
}
SDL_UnlockJoysticks();
return retval;
}
/*
* Return the SDL_Joystick associated with an instance id.
*/
SDL_Joystick *SDL_JoystickFromInstanceID(SDL_JoystickID instance_id)
{
SDL_Joystick *joystick;
SDL_LockJoysticks();
for (joystick = SDL_joysticks; joystick; joystick = joystick->next) {
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;