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annotate src/joystick/beos/SDL_bejoystick.cc @ 2157:75a6c5deba84

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Fixed bug #451 SDL_memset4 copies a 32-bit value, not an 8-bit value.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 08 Jul 2007 14:24:55 +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_BEOS
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25
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26 /* This is the system specific header for the SDL joystick API */
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27
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28 #include <be/support/String.h>
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29 #include <be/device/Joystick.h>
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30
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31 extern "C"
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32 {
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33
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34 #include "SDL_joystick.h"
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35 #include "../SDL_sysjoystick.h"
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36 #include "../SDL_joystick_c.h"
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37
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38
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39 /* The maximum number of joysticks we'll detect */
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40 #define MAX_JOYSTICKS 16
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41
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42 /* A list of available joysticks */
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43 static char *SDL_joyport[MAX_JOYSTICKS];
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44 static char *SDL_joyname[MAX_JOYSTICKS];
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45
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46 /* The private structure used to keep track of a joystick */
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47 struct joystick_hwdata
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48 {
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49 BJoystick *stick;
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50 uint8 *new_hats;
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51 int16 *new_axes;
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52 };
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53
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54 /* Function to scan the system for joysticks.
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55 * This function should set SDL_numjoysticks to the number of available
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56 * joysticks. Joystick 0 should be the system default joystick.
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57 * It should return 0, or -1 on an unrecoverable fatal error.
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58 */
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59 int SDL_SYS_JoystickInit(void)
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60 {
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61 BJoystick joystick;
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62 int numjoysticks;
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63 int i;
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64 int32 nports;
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65 char name[B_OS_NAME_LENGTH];
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66
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67 /* Search for attached joysticks */
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68 nports = joystick.CountDevices();
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69 numjoysticks = 0;
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70 SDL_memset(SDL_joyport, 0, (sizeof SDL_joyport));
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71 SDL_memset(SDL_joyname, 0, (sizeof SDL_joyname));
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72 for (i = 0; (SDL_numjoysticks < MAX_JOYSTICKS) && (i < nports); ++i)
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73 {
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74 if (joystick.GetDeviceName(i, name) == B_OK) {
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75 if (joystick.Open(name) != B_ERROR) {
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76 BString stick_name;
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77 joystick.GetControllerName(&stick_name);
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78 SDL_joyport[numjoysticks] = strdup(name);
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79 SDL_joyname[numjoysticks] = strdup(stick_name.String());
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80 numjoysticks++;
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81 joystick.Close();
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82 }
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83 }
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84 }
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85 return (numjoysticks);
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86 }
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87
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88 /* Function to get the device-dependent name of a joystick */
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89 const char *SDL_SYS_JoystickName(int index)
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90 {
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91 return SDL_joyname[index];
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92 }
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93
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94 /* Function to open a joystick for use.
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95 The joystick to open is specified by the index field of the joystick.
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96 This should fill the nbuttons and naxes fields of the joystick structure.
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97 It returns 0, or -1 if there is an error.
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98 */
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99 int SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
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100 {
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101 BJoystick *stick;
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102
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103 /* Create the joystick data structure */
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104 joystick->hwdata = (struct joystick_hwdata *)
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105 SDL_malloc(sizeof(*joystick->hwdata));
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106 if (joystick->hwdata == NULL) {
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107 SDL_OutOfMemory();
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108 return (-1);
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109 }
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110 SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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111 stick = new BJoystick;
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112 joystick->hwdata->stick = stick;
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113
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114 /* Open the requested joystick for use */
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115 if (stick->Open(SDL_joyport[joystick->index]) == B_ERROR) {
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116 SDL_SetError("Unable to open joystick");
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117 SDL_SYS_JoystickClose(joystick);
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118 return (-1);
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119 }
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120
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121 /* Set the joystick to calibrated mode */
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122 stick->EnableCalibration();
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123
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124 /* Get the number of buttons, hats, and axes on the joystick */
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125 joystick->nbuttons = stick->CountButtons();
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126 joystick->naxes = stick->CountAxes();
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127 joystick->nhats = stick->CountHats();
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128
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129 joystick->hwdata->new_axes = (int16 *)
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130 SDL_malloc(joystick->naxes * sizeof(int16));
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131 joystick->hwdata->new_hats = (uint8 *)
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132 SDL_malloc(joystick->nhats * sizeof(uint8));
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133 if (!joystick->hwdata->new_hats || !joystick->hwdata->new_axes) {
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134 SDL_OutOfMemory();
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135 SDL_SYS_JoystickClose(joystick);
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136 return (-1);
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137 }
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138
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139 /* We're done! */
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140 return (0);
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141 }
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142
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143 /* Function to update the state of a joystick - called as a device poll.
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144 * This function shouldn't update the joystick structure directly,
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145 * but instead should call SDL_PrivateJoystick*() to deliver events
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146 * and update joystick device state.
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147 */
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148 void SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
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149 {
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150 static const Uint8 hat_map[9] = {
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151 SDL_HAT_CENTERED,
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152 SDL_HAT_UP,
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153 SDL_HAT_RIGHTUP,
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154 SDL_HAT_RIGHT,
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155 SDL_HAT_RIGHTDOWN,
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156 SDL_HAT_DOWN,
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157 SDL_HAT_LEFTDOWN,
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158 SDL_HAT_LEFT,
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159 SDL_HAT_LEFTUP
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160 };
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161 const int JITTER = (32768 / 10); /* 10% jitter threshold (ok?) */
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162
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163 BJoystick *stick;
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164 int i, change;
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165 int16 *axes;
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166 uint8 *hats;
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167 uint32 buttons;
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168
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169 /* Set up data pointers */
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170 stick = joystick->hwdata->stick;
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171 axes = joystick->hwdata->new_axes;
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172 hats = joystick->hwdata->new_hats;
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173
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174 /* Get the new joystick state */
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175 stick->Update();
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176 stick->GetAxisValues(axes);
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177 stick->GetHatValues(hats);
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178 buttons = stick->ButtonValues();
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179
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180 /* Generate axis motion events */
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181 for (i = 0; i < joystick->naxes; ++i) {
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182 change = ((int32) axes[i] - joystick->axes[i]);
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183 if ((change > JITTER) || (change < -JITTER)) {
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184 SDL_PrivateJoystickAxis(joystick, i, axes[i]);
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185 }
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186 }
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187
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188 /* Generate hat change events */
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189 for (i = 0; i < joystick->nhats; ++i) {
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190 if (hats[i] != joystick->hats[i]) {
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191 SDL_PrivateJoystickHat(joystick, i, hat_map[hats[i]]);
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192 }
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193 }
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194
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195 /* Generate button events */
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196 for (i = 0; i < joystick->nbuttons; ++i) {
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197 if ((buttons & 0x01) != joystick->buttons[i]) {
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198 SDL_PrivateJoystickButton(joystick, i, (buttons & 0x01));
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199 }
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200 buttons >>= 1;
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201 }
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202 }
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203
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204 /* Function to close a joystick after use */
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205 void SDL_SYS_JoystickClose(SDL_Joystick * joystick)
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206 {
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207 if (joystick->hwdata) {
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208 joystick->hwdata->stick->Close();
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209 delete joystick->hwdata->stick;
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210 if (joystick->hwdata->new_hats) {
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211 SDL_free(joystick->hwdata->new_hats);
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212 }
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213 if (joystick->hwdata->new_axes) {
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214 SDL_free(joystick->hwdata->new_axes);
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215 }
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216 SDL_free(joystick->hwdata);
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217 joystick->hwdata = NULL;
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218 }
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219 }
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220
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221 /* Function to perform any system-specific joystick related cleanup */
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222 void SDL_SYS_JoystickQuit(void)
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223 {
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224 int i;
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225
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226 for (i = 0; SDL_joyport[i]; ++i) {
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227 SDL_free(SDL_joyport[i]);
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228 }
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229 SDL_joyport[0] = NULL;
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230
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231 for (i = 0; SDL_joyname[i]; ++i) {
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232 SDL_free(SDL_joyname[i]);
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233 }
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234 SDL_joyname[0] = NULL;
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235 }
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236
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237 }; // extern "C"
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238
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239 #endif /* SDL_JOYSTICK_BEOS */
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240 /* vi: set ts=4 sw=4 expandtab: */