Mercurial > sdl-ios-xcode
annotate src/joystick/beos/SDL_bejoystick.cc @ 4333:55717a755897 SDL-1.2
Switched from setting the period size and count to setting the buffer size directly, based on feedback from the ALSA development list:
http://mailman.alsa-project.org/pipermail/alsa-devel/2009-October/022267.html
This has the nice side effect of reducing latency on my SBLive! card.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 13 Oct 2009 09:56:15 +0000 |
| parents | a1b03ba2fcd0 |
| children |
| rev | line source |
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| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 4159 | 3 Copyright (C) 1997-2009 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
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24 #ifdef SDL_JOYSTICK_BEOS |
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25 |
| 0 | 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" | |
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34 #include "../SDL_sysjoystick.h" |
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35 #include "../SDL_joystick_c.h" |
| 0 | 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; | |
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68 SDL_memset(SDL_joyport, 0, (sizeof SDL_joyport)); |
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69 SDL_memset(SDL_joyname, 0, (sizeof SDL_joyname)); |
| 0 | 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 *) | |
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103 SDL_malloc(sizeof(*joystick->hwdata)); |
| 0 | 104 if ( joystick->hwdata == NULL ) { |
| 105 SDL_OutOfMemory(); | |
| 106 return(-1); | |
| 107 } | |
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108 SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata)); |
| 0 | 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 *) | |
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128 SDL_malloc(joystick->naxes*sizeof(int16)); |
| 0 | 129 joystick->hwdata->new_hats = (uint8 *) |
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130 SDL_malloc(joystick->nhats*sizeof(uint8)); |
| 0 | 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 ) { | |
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209 SDL_free(joystick->hwdata->new_hats); |
| 0 | 210 } |
| 211 if ( joystick->hwdata->new_axes ) { | |
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212 SDL_free(joystick->hwdata->new_axes); |
| 0 | 213 } |
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214 SDL_free(joystick->hwdata); |
| 0 | 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 ) { | |
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225 SDL_free(SDL_joyport[i]); |
| 0 | 226 } |
| 227 SDL_joyport[0] = NULL; | |
| 228 | |
| 229 for ( i=0; SDL_joyname[i]; ++i ) { | |
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230 SDL_free(SDL_joyname[i]); |
| 0 | 231 } |
| 232 SDL_joyname[0] = NULL; | |
| 233 } | |
| 234 | |
| 235 }; // extern "C" | |
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236 |
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237 #endif /* SDL_JOYSTICK_BEOS */ |