| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | This library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | |
| 23 | /** @file SDL_joystick.h |
| 24 | * Include file for SDL joystick event handling |
| 25 | */ |
| 26 | |
| 27 | #ifndef _SDL_joystick_h |
| 28 | #define _SDL_joystick_h |
| 29 | |
| 30 | #include "SDL_stdinc.h" |
| 31 | #include "SDL_error.h" |
| 32 | |
| 33 | #include "begin_code.h" |
| 34 | /* Set up for C function definitions, even when using C++ */ |
| 35 | #ifdef __cplusplus |
| 36 | extern "C" { |
| 37 | #endif |
| 38 | |
| 39 | /** @file SDL_joystick.h |
| 40 | * @note In order to use these functions, SDL_Init() must have been called |
| 41 | * with the SDL_INIT_JOYSTICK flag. This causes SDL to scan the system |
| 42 | * for joysticks, and load appropriate drivers. |
| 43 | */ |
| 44 | |
| 45 | /** The joystick structure used to identify an SDL joystick */ |
| 46 | struct _SDL_Joystick; |
| 47 | typedef struct _SDL_Joystick SDL_Joystick; |
| 48 | |
| 49 | /* Function prototypes */ |
| 50 | /** |
| 51 | * Count the number of joysticks attached to the system |
| 52 | */ |
| 53 | extern DECLSPEC int SDLCALL SDL_NumJoysticks(void); |
| 54 | |
| 55 | /** |
| 56 | * Get the implementation dependent name of a joystick. |
| 57 | * |
| 58 | * This can be called before any joysticks are opened. |
| 59 | * If no name can be found, this function returns NULL. |
| 60 | */ |
| 61 | extern DECLSPEC const char * SDLCALL SDL_JoystickName(int device_index); |
| 62 | |
| 63 | /** |
| 64 | * Open a joystick for use. |
| 65 | * |
| 66 | * @param[in] device_index |
| 67 | * The index passed as an argument refers to |
| 68 | * the N'th joystick on the system. This index is the value which will |
| 69 | * identify this joystick in future joystick events. |
| 70 | * |
| 71 | * @return This function returns a joystick identifier, or NULL if an error occurred. |
| 72 | */ |
| 73 | extern DECLSPEC SDL_Joystick * SDLCALL SDL_JoystickOpen(int device_index); |
| 74 | |
| 75 | /** |
| 76 | * Returns 1 if the joystick has been opened, or 0 if it has not. |
| 77 | */ |
| 78 | extern DECLSPEC int SDLCALL SDL_JoystickOpened(int device_index); |
| 79 | |
| 80 | /** |
| 81 | * Get the device index of an opened joystick. |
| 82 | */ |
| 83 | extern DECLSPEC int SDLCALL SDL_JoystickIndex(SDL_Joystick *joystick); |
| 84 | |
| 85 | /** |
| 86 | * Get the number of general axis controls on a joystick |
| 87 | */ |
| 88 | extern DECLSPEC int SDLCALL SDL_JoystickNumAxes(SDL_Joystick *joystick); |
| 89 | |
| 90 | /** |
| 91 | * Get the number of trackballs on a joystick |
| 92 | * |
| 93 | * Joystick trackballs have only relative motion events associated |
| 94 | * with them and their state cannot be polled. |
| 95 | */ |
| 96 | extern DECLSPEC int SDLCALL SDL_JoystickNumBalls(SDL_Joystick *joystick); |
| 97 | |
| 98 | /** |
| 99 | * Get the number of POV hats on a joystick |
| 100 | */ |
| 101 | extern DECLSPEC int SDLCALL SDL_JoystickNumHats(SDL_Joystick *joystick); |
| 102 | |
| 103 | /** |
| 104 | * Get the number of buttons on a joystick |
| 105 | */ |
| 106 | extern DECLSPEC int SDLCALL SDL_JoystickNumButtons(SDL_Joystick *joystick); |
| 107 | |
| 108 | /** |
| 109 | * Update the current state of the open joysticks. |
| 110 | * |
| 111 | * This is called automatically by the event loop if any joystick |
| 112 | * events are enabled. |
| 113 | */ |
| 114 | extern DECLSPEC void SDLCALL SDL_JoystickUpdate(void); |
| 115 | |
| 116 | /** |
| 117 | * Enable/disable joystick event polling. |
| 118 | * |
| 119 | * If joystick events are disabled, you must call SDL_JoystickUpdate() |
| 120 | * yourself and check the state of the joystick when you want joystick |
| 121 | * information. |
| 122 | * |
| 123 | * @param[in] state The state can be one of SDL_QUERY, SDL_ENABLE or SDL_IGNORE. |
| 124 | */ |
| 125 | extern DECLSPEC int SDLCALL SDL_JoystickEventState(int state); |
| 126 | |
| 127 | /** |
| 128 | * Get the current state of an axis control on a joystick |
| 129 | * |
| 130 | * @param[in] axis The axis indices start at index 0. |
| 131 | * |
| 132 | * @return The state is a value ranging from -32768 to 32767. |
| 133 | */ |
| 134 | extern DECLSPEC Sint16 SDLCALL SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis); |
| 135 | |
| 136 | /** |
| 137 | * @name Hat Positions |
| 138 | * The return value of SDL_JoystickGetHat() is one of the following positions: |
| 139 | */ |
| 140 | /*@{*/ |
| 141 | #define SDL_HAT_CENTERED 0x00 |
| 142 | #define SDL_HAT_UP 0x01 |
| 143 | #define SDL_HAT_RIGHT 0x02 |
| 144 | #define SDL_HAT_DOWN 0x04 |
| 145 | #define SDL_HAT_LEFT 0x08 |
| 146 | #define SDL_HAT_RIGHTUP (SDL_HAT_RIGHT|SDL_HAT_UP) |
| 147 | #define SDL_HAT_RIGHTDOWN (SDL_HAT_RIGHT|SDL_HAT_DOWN) |
| 148 | #define SDL_HAT_LEFTUP (SDL_HAT_LEFT|SDL_HAT_UP) |
| 149 | #define SDL_HAT_LEFTDOWN (SDL_HAT_LEFT|SDL_HAT_DOWN) |
| 150 | /*@}*/ |
| 151 | |
| 152 | /** |
| 153 | * Get the current state of a POV hat on a joystick |
| 154 | * |
| 155 | * @param[in] hat The hat indices start at index 0. |
| 156 | */ |
| 157 | extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetHat(SDL_Joystick *joystick, int hat); |
| 158 | |
| 159 | /** |
| 160 | * Get the ball axis change since the last poll |
| 161 | * |
| 162 | * @param[in] ball The ball indices start at index 0. |
| 163 | * |
| 164 | * @return This returns 0, or -1 if you passed it invalid parameters. |
| 165 | */ |
| 166 | extern DECLSPEC int SDLCALL SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy); |
| 167 | |
| 168 | /** |
| 169 | * Get the current state of a button on a joystick |
| 170 | * |
| 171 | * @param[in] button The button indices start at index 0. |
| 172 | */ |
| 173 | extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetButton(SDL_Joystick *joystick, int button); |
| 174 | |
| 175 | /** |
| 176 | * Close a joystick previously opened with SDL_JoystickOpen() |
| 177 | */ |
| 178 | extern DECLSPEC void SDLCALL SDL_JoystickClose(SDL_Joystick *joystick); |
| 179 | |
| 180 | |
| 181 | /* Ends C function definitions when using C++ */ |
| 182 | #ifdef __cplusplus |
| 183 | } |
| 184 | #endif |
| 185 | #include "close_code.h" |
| 186 | |
| 187 | #endif /* _SDL_joystick_h */ |