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annotate src/joystick/beos/SDL_bejoystick.cc @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents 92947e3a18db
children 4da1ee79c9af
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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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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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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] =
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80 strdup (stick_name.String ());
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81 numjoysticks++;
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82 joystick.Close ();
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83 }
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84 }
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85 }
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86 return (numjoysticks);
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87 }
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88
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89 /* Function to get the device-dependent name of a joystick */
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90 const char *SDL_SYS_JoystickName (int index)
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91 {
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92 return SDL_joyname[index];
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93 }
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94
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95 /* Function to open a joystick for use.
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96 The joystick to open is specified by the index field of the joystick.
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97 This should fill the nbuttons and naxes fields of the joystick structure.
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98 It returns 0, or -1 if there is an error.
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99 */
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100 int SDL_SYS_JoystickOpen (SDL_Joystick * joystick)
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101 {
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102 BJoystick *stick;
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103
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104 /* Create the joystick data structure */
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105 joystick->hwdata = (struct joystick_hwdata *)
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106 SDL_malloc (sizeof (*joystick->hwdata));
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107 if (joystick->hwdata == NULL) {
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108 SDL_OutOfMemory ();
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109 return (-1);
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110 }
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111 SDL_memset (joystick->hwdata, 0, sizeof (*joystick->hwdata));
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112 stick = new BJoystick;
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113 joystick->hwdata->stick = stick;
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114
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115 /* Open the requested joystick for use */
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116 if (stick->Open (SDL_joyport[joystick->index]) == B_ERROR) {
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117 SDL_SetError ("Unable to open joystick");
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118 SDL_SYS_JoystickClose (joystick);
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119 return (-1);
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120 }
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121
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122 /* Set the joystick to calibrated mode */
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123 stick->EnableCalibration ();
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124
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125 /* Get the number of buttons, hats, and axes on the joystick */
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126 joystick->nbuttons = stick->CountButtons ();
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127 joystick->naxes = stick->CountAxes ();
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128 joystick->nhats = stick->CountHats ();
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129
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130 joystick->hwdata->new_axes = (int16 *)
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131 SDL_malloc (joystick->naxes * sizeof (int16));
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132 joystick->hwdata->new_hats = (uint8 *)
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133 SDL_malloc (joystick->nhats * sizeof (uint8));
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134 if (!joystick->hwdata->new_hats || !joystick->hwdata->new_axes) {
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135 SDL_OutOfMemory ();
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136 SDL_SYS_JoystickClose (joystick);
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137 return (-1);
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138 }
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139
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140 /* We're done! */
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141 return (0);
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142 }
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143
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144 /* Function to update the state of a joystick - called as a device poll.
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145 * This function shouldn't update the joystick structure directly,
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146 * but instead should call SDL_PrivateJoystick*() to deliver events
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147 * and update joystick device state.
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148 */
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149 void SDL_SYS_JoystickUpdate (SDL_Joystick * joystick)
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150 {
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151 static const Uint8 hat_map[9] = {
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152 SDL_HAT_CENTERED,
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153 SDL_HAT_UP,
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154 SDL_HAT_RIGHTUP,
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155 SDL_HAT_RIGHT,
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156 SDL_HAT_RIGHTDOWN,
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157 SDL_HAT_DOWN,
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158 SDL_HAT_LEFTDOWN,
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159 SDL_HAT_LEFT,
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160 SDL_HAT_LEFTUP
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161 };
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162 const int JITTER = (32768 / 10); /* 10% jitter threshold (ok?) */
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163
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164 BJoystick *stick;
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165 int i, change;
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166 int16 *axes;
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167 uint8 *hats;
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168 uint32 buttons;
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169
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170 /* Set up data pointers */
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171 stick = joystick->hwdata->stick;
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172 axes = joystick->hwdata->new_axes;
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173 hats = joystick->hwdata->new_hats;
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174
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175 /* Get the new joystick state */
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176 stick->Update ();
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177 stick->GetAxisValues (axes);
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178 stick->GetHatValues (hats);
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179 buttons = stick->ButtonValues ();
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180
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181 /* Generate axis motion events */
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182 for (i = 0; i < joystick->naxes; ++i) {
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183 change = ((int32) axes[i] - joystick->axes[i]);
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184 if ((change > JITTER) || (change < -JITTER)) {
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185 SDL_PrivateJoystickAxis (joystick, i, axes[i]);
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186 }
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187 }
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188
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189 /* Generate hat change events */
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190 for (i = 0; i < joystick->nhats; ++i) {
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191 if (hats[i] != joystick->hats[i]) {
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192 SDL_PrivateJoystickHat (joystick, i, hat_map[hats[i]]);
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193 }
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194 }
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195
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196 /* Generate button events */
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197 for (i = 0; i < joystick->nbuttons; ++i) {
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198 if ((buttons & 0x01) != joystick->buttons[i]) {
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199 SDL_PrivateJoystickButton (joystick, i, (buttons & 0x01));
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200 }
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201 buttons >>= 1;
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202 }
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203 }
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204
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205 /* Function to close a joystick after use */
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206 void SDL_SYS_JoystickClose (SDL_Joystick * joystick)
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207 {
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208 if (joystick->hwdata) {
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209 joystick->hwdata->stick->Close ();
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210 delete joystick->hwdata->stick;
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211 if (joystick->hwdata->new_hats) {
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212 SDL_free (joystick->hwdata->new_hats);
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213 }
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214 if (joystick->hwdata->new_axes) {
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215 SDL_free (joystick->hwdata->new_axes);
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216 }
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217 SDL_free (joystick->hwdata);
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218 joystick->hwdata = NULL;
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219 }
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220 }
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221
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222 /* Function to perform any system-specific joystick related cleanup */
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223 void SDL_SYS_JoystickQuit (void)
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224 {
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225 int i;
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226
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227 for (i = 0; SDL_joyport[i]; ++i) {
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228 SDL_free (SDL_joyport[i]);
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229 }
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230 SDL_joyport[0] = NULL;
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231
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232 for (i = 0; SDL_joyname[i]; ++i) {
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233 SDL_free (SDL_joyname[i]);
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234 }
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235 SDL_joyname[0] = NULL;
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236 }
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237
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238 }; // extern "C"
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239
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240 #endif /* SDL_JOYSTICK_BEOS */
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241 /* vi: set ts=4 sw=4 expandtab: */