1 /* 2 Simple DirectMedia Layer 3 Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org> 4 5 This software is provided 'as-is', without any express or implied 6 warranty. In no event will the authors be held liable for any damages 7 arising from the use of this software. 8 9 Permission is granted to anyone to use this software for any purpose, 10 including commercial applications, and to alter it and redistribute it 11 freely, subject to the following restrictions: 12 13 1. The origin of this software must not be misrepresented; you must not 14 claim that you wrote the original software. If you use this software 15 in a product, an acknowledgment in the product documentation would be 16 appreciated but is not required. 17 2. Altered source versions must be plainly marked as such, and must not be 18 misrepresented as being the original software. 19 3. This notice may not be removed or altered from any source distribution. 20 */ 21 22 /** 23 * \file SDL_joystick.h 24 * 25 * Include file for SDL joystick event handling 26 * 27 * The term "device_index" identifies currently plugged in joystick devices between 0 and SDL_NumJoysticks(), with the exact joystick 28 * behind a device_index changing as joysticks are plugged and unplugged. 29 * 30 * The term "instance_id" is the current instantiation of a joystick device in the system, if the joystick is removed and then re-inserted 31 * then it will get a new instance_id, instance_id's are monotonically increasing identifiers of a joystick plugged in. 32 * 33 * The term JoystickGUID is a stable 128-bit identifier for a joystick device that does not change over time, it identifies class of 34 * the device (a X360 wired controller for example). This identifier is platform dependent. 35 * 36 * 37 */ 38 39 #ifndef _SDL_joystick_h 40 #define _SDL_joystick_h 41 42 #include "SDL_stdinc.h" 43 #include "SDL_error.h" 44 45 #include "begin_code.h" 46 /* Set up for C function definitions, even when using C++ */ 47 #ifdef __cplusplus 48 extern "C" { 49 #endif 50 51 /** 52 * \file SDL_joystick.h 53 * 54 * In order to use these functions, SDL_Init() must have been called 55 * with the ::SDL_INIT_JOYSTICK flag. This causes SDL to scan the system 56 * for joysticks, and load appropriate drivers. 57 * 58 * If you would like to receive joystick updates while the application 59 * is in the background, you should set the following hint before calling 60 * SDL_Init(): SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS 61 */ 62 63 /* The joystick structure used to identify an SDL joystick */ 64 struct _SDL_Joystick; 65 typedef struct _SDL_Joystick SDL_Joystick; 66 67 /* A structure that encodes the stable unique id for a joystick device */ 68 typedef struct { 69 Uint8 data[16]; 70 } SDL_JoystickGUID; 71 72 typedef Sint32 SDL_JoystickID; 73 74 typedef enum 75 { 76 SDL_JOYSTICK_POWER_UNKNOWN = -1, 77 SDL_JOYSTICK_POWER_EMPTY, 78 SDL_JOYSTICK_POWER_LOW, 79 SDL_JOYSTICK_POWER_MEDIUM, 80 SDL_JOYSTICK_POWER_FULL, 81 SDL_JOYSTICK_POWER_WIRED, 82 SDL_JOYSTICK_POWER_MAX 83 } SDL_JoystickPowerLevel; 84 85 /* Function prototypes */ 86 /** 87 * Count the number of joysticks attached to the system right now 88 */ 89 extern DECLSPEC int SDLCALL SDL_NumJoysticks(void); 90 91 /** 92 * Get the implementation dependent name of a joystick. 93 * This can be called before any joysticks are opened. 94 * If no name can be found, this function returns NULL. 95 */ 96 extern DECLSPEC const char *SDLCALL SDL_JoystickNameForIndex(int device_index); 97 98 /** 99 * Open a joystick for use. 100 * The index passed as an argument refers to the N'th joystick on the system. 101 * This index is not the value which will identify this joystick in future 102 * joystick events. The joystick's instance id (::SDL_JoystickID) will be used 103 * there instead. 104 * 105 * \return A joystick identifier, or NULL if an error occurred. 106 */ 107 extern DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickOpen(int device_index); 108 109 /** 110 * Return the SDL_Joystick associated with an instance id. 111 */ 112 extern DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickFromInstanceID(SDL_JoystickID joyid); 113 114 /** 115 * Return the name for this currently opened joystick. 116 * If no name can be found, this function returns NULL. 117 */ 118 extern DECLSPEC const char *SDLCALL SDL_JoystickName(SDL_Joystick * joystick); 119 120 /** 121 * Return the GUID for the joystick at this index 122 */ 123 extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetDeviceGUID(int device_index); 124 125 /** 126 * Return the GUID for this opened joystick 127 */ 128 extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUID(SDL_Joystick * joystick); 129 130 /** 131 * Return a string representation for this guid. pszGUID must point to at least 33 bytes 132 * (32 for the string plus a NULL terminator). 133 */ 134 extern DECLSPEC void SDLCALL SDL_JoystickGetGUIDString(SDL_JoystickGUID guid, char *pszGUID, int cbGUID); 135 136 /** 137 * convert a string into a joystick formatted guid 138 */ 139 extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUIDFromString(const char *pchGUID); 140 141 /** 142 * Returns SDL_TRUE if the joystick has been opened and currently connected, or SDL_FALSE if it has not. 143 */ 144 extern DECLSPEC SDL_bool SDLCALL SDL_JoystickGetAttached(SDL_Joystick * joystick); 145 146 /** 147 * Get the instance ID of an opened joystick or -1 if the joystick is invalid. 148 */ 149 extern DECLSPEC SDL_JoystickID SDLCALL SDL_JoystickInstanceID(SDL_Joystick * joystick); 150 151 /** 152 * Get the number of general axis controls on a joystick. 153 */ 154 extern DECLSPEC int SDLCALL SDL_JoystickNumAxes(SDL_Joystick * joystick); 155 156 /** 157 * Get the number of trackballs on a joystick. 158 * 159 * Joystick trackballs have only relative motion events associated 160 * with them and their state cannot be polled. 161 */ 162 extern DECLSPEC int SDLCALL SDL_JoystickNumBalls(SDL_Joystick * joystick); 163 164 /** 165 * Get the number of POV hats on a joystick. 166 */ 167 extern DECLSPEC int SDLCALL SDL_JoystickNumHats(SDL_Joystick * joystick); 168 169 /** 170 * Get the number of buttons on a joystick. 171 */ 172 extern DECLSPEC int SDLCALL SDL_JoystickNumButtons(SDL_Joystick * joystick); 173 174 /** 175 * Update the current state of the open joysticks. 176 * 177 * This is called automatically by the event loop if any joystick 178 * events are enabled. 179 */ 180 extern DECLSPEC void SDLCALL SDL_JoystickUpdate(void); 181 182 /** 183 * Enable/disable joystick event polling. 184 * 185 * If joystick events are disabled, you must call SDL_JoystickUpdate() 186 * yourself and check the state of the joystick when you want joystick 187 * information. 188 * 189 * The state can be one of ::SDL_QUERY, ::SDL_ENABLE or ::SDL_IGNORE. 190 */ 191 extern DECLSPEC int SDLCALL SDL_JoystickEventState(int state); 192 193 /** 194 * Get the current state of an axis control on a joystick. 195 * 196 * The state is a value ranging from -32768 to 32767. 197 * 198 * The axis indices start at index 0. 199 */ 200 extern DECLSPEC Sint16 SDLCALL SDL_JoystickGetAxis(SDL_Joystick * joystick, 201 int axis); 202 203 /** 204 * \name Hat positions 205 */ 206 /* @{ */ 207 #define SDL_HAT_CENTERED 0x00 208 #define SDL_HAT_UP 0x01 209 #define SDL_HAT_RIGHT 0x02 210 #define SDL_HAT_DOWN 0x04 211 #define SDL_HAT_LEFT 0x08 212 #define SDL_HAT_RIGHTUP (SDL_HAT_RIGHT|SDL_HAT_UP) 213 #define SDL_HAT_RIGHTDOWN (SDL_HAT_RIGHT|SDL_HAT_DOWN) 214 #define SDL_HAT_LEFTUP (SDL_HAT_LEFT|SDL_HAT_UP) 215 #define SDL_HAT_LEFTDOWN (SDL_HAT_LEFT|SDL_HAT_DOWN) 216 /* @} */ 217 218 /** 219 * Get the current state of a POV hat on a joystick. 220 * 221 * The hat indices start at index 0. 222 * 223 * \return The return value is one of the following positions: 224 * - ::SDL_HAT_CENTERED 225 * - ::SDL_HAT_UP 226 * - ::SDL_HAT_RIGHT 227 * - ::SDL_HAT_DOWN 228 * - ::SDL_HAT_LEFT 229 * - ::SDL_HAT_RIGHTUP 230 * - ::SDL_HAT_RIGHTDOWN 231 * - ::SDL_HAT_LEFTUP 232 * - ::SDL_HAT_LEFTDOWN 233 */ 234 extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetHat(SDL_Joystick * joystick, 235 int hat); 236 237 /** 238 * Get the ball axis change since the last poll. 239 * 240 * \return 0, or -1 if you passed it invalid parameters. 241 * 242 * The ball indices start at index 0. 243 */ 244 extern DECLSPEC int SDLCALL SDL_JoystickGetBall(SDL_Joystick * joystick, 245 int ball, int *dx, int *dy); 246 247 /** 248 * Get the current state of a button on a joystick. 249 * 250 * The button indices start at index 0. 251 */ 252 extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetButton(SDL_Joystick * joystick, 253 int button); 254 255 /** 256 * Close a joystick previously opened with SDL_JoystickOpen(). 257 */ 258 extern DECLSPEC void SDLCALL SDL_JoystickClose(SDL_Joystick * joystick); 259 260 /** 261 * Return the battery level of this joystick 262 */ 263 extern DECLSPEC SDL_JoystickPowerLevel SDLCALL SDL_JoystickCurrentPowerLevel(SDL_Joystick * joystick); 264 265 /* Ends C function definitions when using C++ */ 266 #ifdef __cplusplus 267 } 268 #endif 269 #include "close_code.h" 270 271 #endif /* _SDL_joystick_h */ 272 273 /* vi: set ts=4 sw=4 expandtab: */ 274