| 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 | #include "SDL_config.h" |
| 23 | |
| 24 | #ifdef SDL_JOYSTICK_BEOS |
| 25 | |
| 26 | /* This is the system specific header for the SDL joystick API */ |
| 27 | |
| 28 | #include <be/support/String.h> |
| 29 | #include <be/device/Joystick.h> |
| 30 | |
| 31 | extern "C" { |
| 32 | |
| 33 | #include "SDL_joystick.h" |
| 34 | #include "../SDL_sysjoystick.h" |
| 35 | #include "../SDL_joystick_c.h" |
| 36 | |
| 37 | |
| 38 | /* The maximum number of joysticks we'll detect */ |
| 39 | #define MAX_JOYSTICKS 16 |
| 40 | |
| 41 | /* A list of available joysticks */ |
| 42 | static char *SDL_joyport[MAX_JOYSTICKS]; |
| 43 | static char *SDL_joyname[MAX_JOYSTICKS]; |
| 44 | |
| 45 | /* The private structure used to keep track of a joystick */ |
| 46 | struct joystick_hwdata { |
| 47 | BJoystick *stick; |
| 48 | uint8 *new_hats; |
| 49 | int16 *new_axes; |
| 50 | }; |
| 51 | |
| 52 | /* Function to scan the system for joysticks. |
| 53 | * This function should set SDL_numjoysticks to the number of available |
| 54 | * joysticks. Joystick 0 should be the system default joystick. |
| 55 | * It should return 0, or -1 on an unrecoverable fatal error. |
| 56 | */ |
| 57 | int SDL_SYS_JoystickInit(void) |
| 58 | { |
| 59 | BJoystick joystick; |
| 60 | int numjoysticks; |
| 61 | int i; |
| 62 | int32 nports; |
| 63 | char name[B_OS_NAME_LENGTH]; |
| 64 | |
| 65 | /* Search for attached joysticks */ |
| 66 | nports = joystick.CountDevices(); |
| 67 | numjoysticks = 0; |
| 68 | SDL_memset(SDL_joyport, 0, (sizeof SDL_joyport)); |
| 69 | SDL_memset(SDL_joyname, 0, (sizeof SDL_joyname)); |
| 70 | for ( i=0; (SDL_numjoysticks < MAX_JOYSTICKS) && (i < nports); ++i ) { |
| 71 | if ( joystick.GetDeviceName(i, name) == B_OK ) { |
| 72 | if ( joystick.Open(name) != B_ERROR ) { |
| 73 | BString stick_name; |
| 74 | joystick.GetControllerName(&stick_name); |
| 75 | SDL_joyport[numjoysticks] = strdup(name); |
| 76 | SDL_joyname[numjoysticks] = |
| 77 | strdup(stick_name.String()); |
| 78 | numjoysticks++; |
| 79 | joystick.Close(); |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | return(numjoysticks); |
| 84 | } |
| 85 | |
| 86 | /* Function to get the device-dependent name of a joystick */ |
| 87 | const char *SDL_SYS_JoystickName(int index) |
| 88 | { |
| 89 | return SDL_joyname[index]; |
| 90 | } |
| 91 | |
| 92 | /* Function to open a joystick for use. |
| 93 | The joystick to open is specified by the index field of the joystick. |
| 94 | This should fill the nbuttons and naxes fields of the joystick structure. |
| 95 | It returns 0, or -1 if there is an error. |
| 96 | */ |
| 97 | int SDL_SYS_JoystickOpen(SDL_Joystick *joystick) |
| 98 | { |
| 99 | BJoystick *stick; |
| 100 | |
| 101 | /* Create the joystick data structure */ |
| 102 | joystick->hwdata = (struct joystick_hwdata *) |
| 103 | SDL_malloc(sizeof(*joystick->hwdata)); |
| 104 | if ( joystick->hwdata == NULL ) { |
| 105 | SDL_OutOfMemory(); |
| 106 | return(-1); |
| 107 | } |
| 108 | SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata)); |
| 109 | stick = new BJoystick; |
| 110 | joystick->hwdata->stick = stick; |
| 111 | |
| 112 | /* Open the requested joystick for use */ |
| 113 | if ( stick->Open(SDL_joyport[joystick->index]) == B_ERROR ) { |
| 114 | SDL_SetError("Unable to open joystick"); |
| 115 | SDL_SYS_JoystickClose(joystick); |
| 116 | return(-1); |
| 117 | } |
| 118 | |
| 119 | /* Set the joystick to calibrated mode */ |
| 120 | stick->EnableCalibration(); |
| 121 | |
| 122 | /* Get the number of buttons, hats, and axes on the joystick */ |
| 123 | joystick->nbuttons = stick->CountButtons(); |
| 124 | joystick->naxes = stick->CountAxes(); |
| 125 | joystick->nhats = stick->CountHats(); |
| 126 | |
| 127 | joystick->hwdata->new_axes = (int16 *) |
| 128 | SDL_malloc(joystick->naxes*sizeof(int16)); |
| 129 | joystick->hwdata->new_hats = (uint8 *) |
| 130 | SDL_malloc(joystick->nhats*sizeof(uint8)); |
| 131 | if ( ! joystick->hwdata->new_hats || ! joystick->hwdata->new_axes ) { |
| 132 | SDL_OutOfMemory(); |
| 133 | SDL_SYS_JoystickClose(joystick); |
| 134 | return(-1); |
| 135 | } |
| 136 | |
| 137 | /* We're done! */ |
| 138 | return(0); |
| 139 | } |
| 140 | |
| 141 | /* Function to update the state of a joystick - called as a device poll. |
| 142 | * This function shouldn't update the joystick structure directly, |
| 143 | * but instead should call SDL_PrivateJoystick*() to deliver events |
| 144 | * and update joystick device state. |
| 145 | */ |
| 146 | void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick) |
| 147 | { |
| 148 | static const Uint8 hat_map[9] = { |
| 149 | SDL_HAT_CENTERED, |
| 150 | SDL_HAT_UP, |
| 151 | SDL_HAT_RIGHTUP, |
| 152 | SDL_HAT_RIGHT, |
| 153 | SDL_HAT_RIGHTDOWN, |
| 154 | SDL_HAT_DOWN, |
| 155 | SDL_HAT_LEFTDOWN, |
| 156 | SDL_HAT_LEFT, |
| 157 | SDL_HAT_LEFTUP |
| 158 | }; |
| 159 | const int JITTER = (32768/10); /* 10% jitter threshold (ok?) */ |
| 160 | |
| 161 | BJoystick *stick; |
| 162 | int i, change; |
| 163 | int16 *axes; |
| 164 | uint8 *hats; |
| 165 | uint32 buttons; |
| 166 | |
| 167 | /* Set up data pointers */ |
| 168 | stick = joystick->hwdata->stick; |
| 169 | axes = joystick->hwdata->new_axes; |
| 170 | hats = joystick->hwdata->new_hats; |
| 171 | |
| 172 | /* Get the new joystick state */ |
| 173 | stick->Update(); |
| 174 | stick->GetAxisValues(axes); |
| 175 | stick->GetHatValues(hats); |
| 176 | buttons = stick->ButtonValues(); |
| 177 | |
| 178 | /* Generate axis motion events */ |
| 179 | for ( i=0; i<joystick->naxes; ++i ) { |
| 180 | change = ((int32)axes[i] - joystick->axes[i]); |
| 181 | if ( (change > JITTER) || (change < -JITTER) ) { |
| 182 | SDL_PrivateJoystickAxis(joystick, i, axes[i]); |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | /* Generate hat change events */ |
| 187 | for ( i=0; i<joystick->nhats; ++i ) { |
| 188 | if ( hats[i] != joystick->hats[i] ) { |
| 189 | SDL_PrivateJoystickHat(joystick, i, hat_map[hats[i]]); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | /* Generate button events */ |
| 194 | for ( i=0; i<joystick->nbuttons; ++i ) { |
| 195 | if ( (buttons&0x01) != joystick->buttons[i] ) { |
| 196 | SDL_PrivateJoystickButton(joystick, i, (buttons&0x01)); |
| 197 | } |
| 198 | buttons >>= 1; |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | /* Function to close a joystick after use */ |
| 203 | void SDL_SYS_JoystickClose(SDL_Joystick *joystick) |
| 204 | { |
| 205 | if ( joystick->hwdata ) { |
| 206 | joystick->hwdata->stick->Close(); |
| 207 | delete joystick->hwdata->stick; |
| 208 | if ( joystick->hwdata->new_hats ) { |
| 209 | SDL_free(joystick->hwdata->new_hats); |
| 210 | } |
| 211 | if ( joystick->hwdata->new_axes ) { |
| 212 | SDL_free(joystick->hwdata->new_axes); |
| 213 | } |
| 214 | SDL_free(joystick->hwdata); |
| 215 | joystick->hwdata = NULL; |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | /* Function to perform any system-specific joystick related cleanup */ |
| 220 | void SDL_SYS_JoystickQuit(void) |
| 221 | { |
| 222 | int i; |
| 223 | |
| 224 | for ( i=0; SDL_joyport[i]; ++i ) { |
| 225 | SDL_free(SDL_joyport[i]); |
| 226 | } |
| 227 | SDL_joyport[0] = NULL; |
| 228 | |
| 229 | for ( i=0; SDL_joyname[i]; ++i ) { |
| 230 | SDL_free(SDL_joyname[i]); |
| 231 | } |
| 232 | SDL_joyname[0] = NULL; |
| 233 | } |
| 234 | |
| 235 | }; // extern "C" |
| 236 | |
| 237 | #endif /* SDL_JOYSTICK_BEOS */ |