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annotate src/joystick/dc/SDL_sysjoystick.c @ 1616:9f836cec0521

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author Sam Lantinga <slouken@libsdl.org>
date Fri, 31 Mar 2006 06:30:16 +0000
parents 11134dc42da8
children 92947e3a18db
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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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
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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.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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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
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include "SDL_events.h"
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25 #include "SDL_joystick.h"
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26 #include "../SDL_sysjoystick.h"
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27 #include "../SDL_joystick_c.h"
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28
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29 #include <dc/maple.h>
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30 #include <dc/maple/controller.h>
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31
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32 #define MAX_JOYSTICKS 8 /* only 2 are supported in the multimedia API */
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33 #define MAX_AXES 6 /* each joystick can have up to 6 axes */
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34 #define MAX_BUTTONS 8 /* and 8 buttons */
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35 #define MAX_HATS 2
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36
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37 #define JOYNAMELEN 8
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38
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39 /* array to hold joystick ID values */
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40 static uint8 SYS_Joystick_addr[MAX_JOYSTICKS];
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41
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42 /* The private structure used to keep track of a joystick */
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43 struct joystick_hwdata
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44 {
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45 cont_cond_t prev_cond;
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46 int prev_buttons;
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47 };
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48
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49 /* Function to scan the system for joysticks.
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50 * This function should set SDL_numjoysticks to the number of available
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51 * joysticks. Joystick 0 should be the system default joystick.
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52 * It should return 0, or -1 on an unrecoverable fatal error.
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53 */
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54 int SDL_SYS_JoystickInit(void)
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55 {
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56 int numdevs;
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57
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58 int p,u;
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59
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60 numdevs = 0;
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61 for(p=0;p<MAPLE_PORT_COUNT;p++) {
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62 for(u=0;u<MAPLE_UNIT_COUNT;u++) {
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63 if (maple_device_func(p,u)&MAPLE_FUNC_CONTROLLER) {
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64 SYS_Joystick_addr[numdevs] = maple_addr(p,u);
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65 numdevs++;
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66 }
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67 }
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68 }
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69
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70 return(numdevs);
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71 }
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72
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73 /* Function to get the device-dependent name of a joystick */
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74 const char *SDL_SYS_JoystickName(int index)
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75 {
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76 maple_device_t *dev;
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77 if (maple_compat_resolve(SYS_Joystick_addr[index],&dev,MAPLE_FUNC_CONTROLLER)!=0) return NULL;
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78 return dev->info.product_name;
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79 }
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80
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81 /* Function to open a joystick for use.
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82 The joystick to open is specified by the index field of the joystick.
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83 This should fill the nbuttons and naxes fields of the joystick structure.
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84 It returns 0, or -1 if there is an error.
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85 */
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86 int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
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87 {
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88 /* allocate memory for system specific hardware data */
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89 joystick->hwdata = (struct joystick_hwdata *) SDL_malloc(sizeof(*joystick->hwdata));
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90 if (joystick->hwdata == NULL)
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91 {
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92 SDL_OutOfMemory();
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93 return(-1);
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94 }
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95 SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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96
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97 /* fill nbuttons, naxes, and nhats fields */
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98 joystick->nbuttons = MAX_BUTTONS;
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99 joystick->naxes = MAX_AXES;
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100 joystick->nhats = MAX_HATS;
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101 return(0);
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102 }
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103
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104
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105 /* Function to update the state of a joystick - called as a device poll.
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106 * This function shouldn't update the joystick structure directly,
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107 * but instead should call SDL_PrivateJoystick*() to deliver events
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108 * and update joystick device state.
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109 */
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110
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111 void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
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112 {
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113 const int sdl_buttons[] = {
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114 CONT_C,
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115 CONT_B,
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116 CONT_A,
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117 CONT_START,
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118 CONT_Z,
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119 CONT_Y,
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120 CONT_X,
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121 CONT_D
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122 };
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123
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124 uint8 addr;
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125 cont_cond_t cond,*prev_cond;
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126 int buttons,prev_buttons,i,changed;
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127
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128 addr = SYS_Joystick_addr[joystick->index];
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129 if (cont_get_cond(addr,&cond)<0) return;
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130
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131 buttons = cond.buttons;
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132 prev_buttons = joystick->hwdata->prev_buttons;
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133 changed = buttons^prev_buttons;
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134
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135 if ((changed)&(CONT_DPAD_UP|CONT_DPAD_DOWN|CONT_DPAD_LEFT|CONT_DPAD_RIGHT)) {
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136 int hat = SDL_HAT_CENTERED;
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137 if (buttons&CONT_DPAD_UP) hat|=SDL_HAT_UP;
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138 if (buttons&CONT_DPAD_DOWN) hat|=SDL_HAT_DOWN;
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139 if (buttons&CONT_DPAD_LEFT) hat|=SDL_HAT_LEFT;
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140 if (buttons&CONT_DPAD_RIGHT) hat|=SDL_HAT_RIGHT;
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141 SDL_PrivateJoystickHat(joystick, 0, hat);
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142 }
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143 if ((changed)&(CONT_DPAD2_UP|CONT_DPAD2_DOWN|CONT_DPAD2_LEFT|CONT_DPAD2_RIGHT)) {
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144 int hat = SDL_HAT_CENTERED;
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145 if (buttons&CONT_DPAD2_UP) hat|=SDL_HAT_UP;
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146 if (buttons&CONT_DPAD2_DOWN) hat|=SDL_HAT_DOWN;
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147 if (buttons&CONT_DPAD2_LEFT) hat|=SDL_HAT_LEFT;
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148 if (buttons&CONT_DPAD2_RIGHT) hat|=SDL_HAT_RIGHT;
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149 SDL_PrivateJoystickHat(joystick, 1, hat);
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150 }
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151
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152 for(i=0;i<sizeof(sdl_buttons)/sizeof(sdl_buttons[0]);i++) {
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153 if (changed & sdl_buttons[i]) {
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154 SDL_PrivateJoystickButton(joystick, i, (buttons & sdl_buttons[i])?SDL_PRESSED:SDL_RELEASED);
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155 }
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156 }
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157
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158 prev_cond = &joystick->hwdata->prev_cond;
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159 if (cond.joyx!=prev_cond->joyx)
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160 SDL_PrivateJoystickAxis(joystick, 0, cond.joyx-128);
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161 if (cond.joyy!=prev_cond->joyy)
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162 SDL_PrivateJoystickAxis(joystick, 1, cond.joyy-128);
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163 if (cond.rtrig!=prev_cond->rtrig)
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164 SDL_PrivateJoystickAxis(joystick, 2, cond.rtrig);
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165 if (cond.ltrig!=prev_cond->ltrig)
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166 SDL_PrivateJoystickAxis(joystick, 3, cond.ltrig);
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167 if (cond.joy2x!=prev_cond->joy2x)
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168 SDL_PrivateJoystickAxis(joystick, 4, cond.joy2x-128);
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169 if (cond.joy2y!=prev_cond->joy2y)
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170 SDL_PrivateJoystickAxis(joystick, 5, cond.joy2y-128);
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171
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172 joystick->hwdata->prev_buttons = buttons;
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173 joystick->hwdata->prev_cond = cond;
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174 }
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175
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176 /* Function to close a joystick after use */
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177 void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
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178 {
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179 if (joystick->hwdata != NULL) {
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180 /* free system specific hardware data */
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181 SDL_free(joystick->hwdata);
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182 }
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183 }
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184
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185 /* Function to perform any system-specific joystick related cleanup */
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186 void SDL_SYS_JoystickQuit(void)
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187 {
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188 return;
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189 }