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annotate src/joystick/dc/SDL_sysjoystick.c @ 2256:e893d24ad8db

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Getting ready to add slow blitters. Everyone will love me. :)
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Aug 2007 22:56:18 +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: */