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annotate include/SDL_joystick.h @ 3647:c5925cd41955

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First pass at Ryan's assertion code, minor tweaks to come.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 13 Jan 2010 06:47:17 +0000
parents d3baf5ac4e37
children f7b03b6838cb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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
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23 /**
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24 * \file SDL_joystick.h
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25 *
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26 * Include file for SDL joystick event handling
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27 */
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28
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29 #ifndef _SDL_joystick_h
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30 #define _SDL_joystick_h
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31
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32 #include "SDL_stdinc.h"
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33 #include "SDL_error.h"
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34
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35 #include "begin_code.h"
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36 /* Set up for C function definitions, even when using C++ */
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37 #ifdef __cplusplus
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38 /* *INDENT-OFF* */
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39 extern "C" {
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40 /* *INDENT-ON* */
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41 #endif
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42
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43 /**
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44 * \file SDL_joystick.h
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45 *
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46 * In order to use these functions, SDL_Init() must have been called
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47 * with the ::SDL_INIT_JOYSTICK flag. This causes SDL to scan the system
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48 * for joysticks, and load appropriate drivers.
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49 */
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50
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51 /* The joystick structure used to identify an SDL joystick */
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52 struct _SDL_Joystick;
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53 typedef struct _SDL_Joystick SDL_Joystick;
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54
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55
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56 /* Function prototypes */
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57 /**
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58 * Count the number of joysticks attached to the system
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59 */
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60 extern DECLSPEC int SDLCALL SDL_NumJoysticks(void);
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61
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62 /**
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63 * Get the implementation dependent name of a joystick.
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64 * This can be called before any joysticks are opened.
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65 * If no name can be found, this function returns NULL.
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66 */
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67 extern DECLSPEC const char *SDLCALL SDL_JoystickName(int device_index);
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68
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69 /**
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70 * Open a joystick for use.
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71 * The index passed as an argument refers tothe N'th joystick on the system.
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72 * This index is the value which will identify this joystick in future joystick
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73 * events.
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74 *
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75 * \return A joystick identifier, or NULL if an error occurred.
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76 */
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77 extern DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickOpen(int device_index);
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78
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79 /**
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80 * Returns 1 if the joystick has been opened, or 0 if it has not.
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81 */
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82 extern DECLSPEC int SDLCALL SDL_JoystickOpened(int device_index);
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83
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84 /**
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85 * Get the device index of an opened joystick.
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86 */
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87 extern DECLSPEC int SDLCALL SDL_JoystickIndex(SDL_Joystick * joystick);
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88
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89 /**
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90 * Get the number of general axis controls on a joystick.
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91 */
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92 extern DECLSPEC int SDLCALL SDL_JoystickNumAxes(SDL_Joystick * joystick);
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93
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94 /**
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95 * Get the number of trackballs on a joystick.
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96 *
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97 * Joystick trackballs have only relative motion events associated
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98 * with them and their state cannot be polled.
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99 */
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100 extern DECLSPEC int SDLCALL SDL_JoystickNumBalls(SDL_Joystick * joystick);
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101
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102 /**
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103 * Get the number of POV hats on a joystick.
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104 */
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105 extern DECLSPEC int SDLCALL SDL_JoystickNumHats(SDL_Joystick * joystick);
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106
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107 /**
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108 * Get the number of buttons on a joystick.
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109 */
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110 extern DECLSPEC int SDLCALL SDL_JoystickNumButtons(SDL_Joystick * joystick);
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111
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112 /**
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113 * Update the current state of the open joysticks.
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114 *
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115 * This is called automatically by the event loop if any joystick
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116 * events are enabled.
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117 */
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118 extern DECLSPEC void SDLCALL SDL_JoystickUpdate(void);
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119
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120 /**
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121 * Enable/disable joystick event polling.
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122 *
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123 * If joystick events are disabled, you must call SDL_JoystickUpdate()
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124 * yourself and check the state of the joystick when you want joystick
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125 * information.
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126 *
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127 * The state can be one of ::SDL_QUERY, ::SDL_ENABLE or ::SDL_IGNORE.
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128 */
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129 extern DECLSPEC int SDLCALL SDL_JoystickEventState(int state);
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130
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131 /**
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132 * Get the current state of an axis control on a joystick.
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133 *
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134 * The state is a value ranging from -32768 to 32767.
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135 *
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136 * The axis indices start at index 0.
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137 */
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138 extern DECLSPEC Sint16 SDLCALL SDL_JoystickGetAxis(SDL_Joystick * joystick,
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139 int axis);
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140
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141 /**
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142 * \name Hat positions
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143 */
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144 /*@{*/
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145 #define SDL_HAT_CENTERED 0x00
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146 #define SDL_HAT_UP 0x01
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147 #define SDL_HAT_RIGHT 0x02
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148 #define SDL_HAT_DOWN 0x04
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149 #define SDL_HAT_LEFT 0x08
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150 #define SDL_HAT_RIGHTUP (SDL_HAT_RIGHT|SDL_HAT_UP)
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151 #define SDL_HAT_RIGHTDOWN (SDL_HAT_RIGHT|SDL_HAT_DOWN)
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152 #define SDL_HAT_LEFTUP (SDL_HAT_LEFT|SDL_HAT_UP)
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153 #define SDL_HAT_LEFTDOWN (SDL_HAT_LEFT|SDL_HAT_DOWN)
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154 /*@}*/
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155
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156 /**
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157 * Get the current state of a POV hat on a joystick.
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158 *
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159 * The hat indices start at index 0.
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160 *
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161 * \return The return value is one of the following positions:
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162 * - ::SDL_HAT_CENTERED
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163 * - ::SDL_HAT_UP
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164 * - ::SDL_HAT_RIGHT
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165 * - ::SDL_HAT_DOWN
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166 * - ::SDL_HAT_LEFT
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167 * - ::SDL_HAT_RIGHTUP
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168 * - ::SDL_HAT_RIGHTDOWN
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169 * - ::SDL_HAT_LEFTUP
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170 * - ::SDL_HAT_LEFTDOWN
0
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171 */
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172 extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetHat(SDL_Joystick * joystick,
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173 int hat);
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174
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175 /**
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176 * Get the ball axis change since the last poll.
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177 *
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178 * \return 0, or -1 if you passed it invalid parameters.
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179 *
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180 * The ball indices start at index 0.
0
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181 */
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182 extern DECLSPEC int SDLCALL SDL_JoystickGetBall(SDL_Joystick * joystick,
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183 int ball, int *dx, int *dy);
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184
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185 /**
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186 * Get the current state of a button on a joystick.
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187 *
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188 * The button indices start at index 0.
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189 */
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190 extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetButton(SDL_Joystick * joystick,
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191 int button);
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192
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193 /**
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194 * Close a joystick previously opened with SDL_JoystickOpen().
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195 */
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196 extern DECLSPEC void SDLCALL SDL_JoystickClose(SDL_Joystick * joystick);
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197
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198
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199 /* Ends C function definitions when using C++ */
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200 #ifdef __cplusplus
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201 /* *INDENT-OFF* */
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202 }
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203 /* *INDENT-ON* */
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204 #endif
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205 #include "close_code.h"
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206
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207 #endif /* _SDL_joystick_h */
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208
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209 /* vi: set ts=4 sw=4 expandtab: */