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annotate src/joystick/dc/SDL_sysjoystick.c @ 2349:0381047f2210 gsoc2008_iphone

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The class SDL_uikitappdelegate acts as the UIApplicationDelegate for an iPhone SDL project. This class is reponsible for application control flow, including initial setup of working directory, forwarding command line arguments to the user's main function, and handling application termination.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Thu, 17 Jul 2008 22:29:37 +0000
parents c121d94672cb
children 99210400e8b9
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 #ifdef SDL_JOYSTICK_DC
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25
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26 #include "SDL_events.h"
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27 #include "SDL_joystick.h"
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28 #include "../SDL_sysjoystick.h"
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29 #include "../SDL_joystick_c.h"
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30
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31 #include <dc/maple.h>
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32 #include <dc/maple/controller.h>
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33
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34 #define MAX_JOYSTICKS 8 /* only 2 are supported in the multimedia API */
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35 #define MAX_AXES 6 /* each joystick can have up to 6 axes */
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36 #define MAX_BUTTONS 8 /* and 8 buttons */
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37 #define MAX_HATS 2
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38
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39 #define JOYNAMELEN 8
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40
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41 /* array to hold joystick ID values */
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42 static uint8 SYS_Joystick_addr[MAX_JOYSTICKS];
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43
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44 /* The private structure used to keep track of a joystick */
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45 struct joystick_hwdata
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46 {
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47 cont_cond_t prev_cond;
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48 int prev_buttons;
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49 };
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50
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51 /* Function to scan the system for joysticks.
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52 * This function should set SDL_numjoysticks to the number of available
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53 * joysticks. Joystick 0 should be the system default joystick.
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54 * It should return 0, or -1 on an unrecoverable fatal error.
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55 */
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56 int
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57 SDL_SYS_JoystickInit(void)
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58 {
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59 int numdevs;
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60
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61 int p, u;
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62
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63 numdevs = 0;
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64 for (p = 0; p < MAPLE_PORT_COUNT; p++) {
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65 for (u = 0; u < MAPLE_UNIT_COUNT; u++) {
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66 if (maple_device_func(p, u) & MAPLE_FUNC_CONTROLLER) {
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67 SYS_Joystick_addr[numdevs] = maple_addr(p, u);
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68 numdevs++;
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69 }
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70 }
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71 }
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72
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73 return (numdevs);
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74 }
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75
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76 /* Function to get the device-dependent name of a joystick */
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77 const char *
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78 SDL_SYS_JoystickName(int index)
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79 {
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80 maple_device_t *dev;
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81 if (maple_compat_resolve
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82 (SYS_Joystick_addr[index], &dev, MAPLE_FUNC_CONTROLLER) != 0)
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83 return NULL;
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84 return dev->info.product_name;
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85 }
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86
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87 /* Function to open a joystick for use.
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88 The joystick to open is specified by the index field of the joystick.
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89 This should fill the nbuttons and naxes fields of the joystick structure.
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90 It returns 0, or -1 if there is an error.
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91 */
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92 int
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93 SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
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94 {
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95 /* allocate memory for system specific hardware data */
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96 joystick->hwdata =
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97 (struct joystick_hwdata *) SDL_malloc(sizeof(*joystick->hwdata));
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98 if (joystick->hwdata == NULL) {
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99 SDL_OutOfMemory();
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100 return (-1);
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101 }
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102 SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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103
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104 /* fill nbuttons, naxes, and nhats fields */
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105 joystick->nbuttons = MAX_BUTTONS;
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106 joystick->naxes = MAX_AXES;
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107 joystick->nhats = MAX_HATS;
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108 return (0);
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109 }
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110
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111
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112 /* Function to update the state of a joystick - called as a device poll.
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113 * This function shouldn't update the joystick structure directly,
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114 * but instead should call SDL_PrivateJoystick*() to deliver events
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115 * and update joystick device state.
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116 */
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117
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118 void
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119 SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
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120 {
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121 const int sdl_buttons[] = {
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122 CONT_C,
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123 CONT_B,
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124 CONT_A,
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125 CONT_START,
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126 CONT_Z,
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127 CONT_Y,
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128 CONT_X,
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129 CONT_D
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130 };
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131
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132 uint8 addr;
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133 cont_cond_t cond, *prev_cond;
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134 int buttons, prev_buttons, i, changed;
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135
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136 addr = SYS_Joystick_addr[joystick->index];
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137 if (cont_get_cond(addr, &cond) < 0)
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138 return;
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139
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140 buttons = cond.buttons;
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141 prev_buttons = joystick->hwdata->prev_buttons;
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142 changed = buttons ^ prev_buttons;
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143
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144 if ((changed) &
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145 (CONT_DPAD_UP | CONT_DPAD_DOWN | CONT_DPAD_LEFT | CONT_DPAD_RIGHT)) {
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146 int hat = SDL_HAT_CENTERED;
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147 if (buttons & CONT_DPAD_UP)
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148 hat |= SDL_HAT_UP;
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149 if (buttons & CONT_DPAD_DOWN)
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150 hat |= SDL_HAT_DOWN;
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151 if (buttons & CONT_DPAD_LEFT)
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152 hat |= SDL_HAT_LEFT;
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153 if (buttons & CONT_DPAD_RIGHT)
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154 hat |= SDL_HAT_RIGHT;
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155 SDL_PrivateJoystickHat(joystick, 0, hat);
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156 }
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157 if ((changed) &
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158 (CONT_DPAD2_UP | CONT_DPAD2_DOWN | CONT_DPAD2_LEFT |
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159 CONT_DPAD2_RIGHT)) {
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160 int hat = SDL_HAT_CENTERED;
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161 if (buttons & CONT_DPAD2_UP)
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162 hat |= SDL_HAT_UP;
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163 if (buttons & CONT_DPAD2_DOWN)
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164 hat |= SDL_HAT_DOWN;
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165 if (buttons & CONT_DPAD2_LEFT)
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166 hat |= SDL_HAT_LEFT;
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167 if (buttons & CONT_DPAD2_RIGHT)
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168 hat |= SDL_HAT_RIGHT;
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169 SDL_PrivateJoystickHat(joystick, 1, hat);
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170 }
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171
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172 for (i = 0; i < sizeof(sdl_buttons) / sizeof(sdl_buttons[0]); i++) {
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173 if (changed & sdl_buttons[i]) {
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174 SDL_PrivateJoystickButton(joystick, i,
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175 (buttons & sdl_buttons[i]) ?
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176 SDL_PRESSED : SDL_RELEASED);
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177 }
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178 }
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179
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180 prev_cond = &joystick->hwdata->prev_cond;
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181 if (cond.joyx != prev_cond->joyx)
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182 SDL_PrivateJoystickAxis(joystick, 0, cond.joyx - 128);
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183 if (cond.joyy != prev_cond->joyy)
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184 SDL_PrivateJoystickAxis(joystick, 1, cond.joyy - 128);
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185 if (cond.rtrig != prev_cond->rtrig)
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186 SDL_PrivateJoystickAxis(joystick, 2, cond.rtrig);
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187 if (cond.ltrig != prev_cond->ltrig)
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188 SDL_PrivateJoystickAxis(joystick, 3, cond.ltrig);
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189 if (cond.joy2x != prev_cond->joy2x)
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190 SDL_PrivateJoystickAxis(joystick, 4, cond.joy2x - 128);
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191 if (cond.joy2y != prev_cond->joy2y)
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192 SDL_PrivateJoystickAxis(joystick, 5, cond.joy2y - 128);
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193
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194 joystick->hwdata->prev_buttons = buttons;
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195 joystick->hwdata->prev_cond = cond;
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196 }
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197
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198 /* Function to close a joystick after use */
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199 void
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200 SDL_SYS_JoystickClose(SDL_Joystick * joystick)
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201 {
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202 if (joystick->hwdata != NULL) {
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203 /* free system specific hardware data */
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204 SDL_free(joystick->hwdata);
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205 }
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206 }
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207
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208 /* Function to perform any system-specific joystick related cleanup */
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209 void
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210 SDL_SYS_JoystickQuit(void)
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211 {
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212 return;
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213 }
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214
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215 #endif /* SDL_JOYSTICK_DC */
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216 /* vi: set ts=4 sw=4 expandtab: */