annotate include/SDL_joystick.h @ 2848:8a3aa505ecba

Comment cleanup.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 07 Dec 2008 07:16:40 +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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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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67114343400d *** empty log message ***
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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 /* In order to use these functions, SDL_Init() must have been called
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44 with the SDL_INIT_JOYSTICK flag. This causes SDL to scan the system
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45 for joysticks, and load appropriate drivers.
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46 */
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47
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48 /* The joystick structure used to identify an SDL joystick */
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49 struct _SDL_Joystick;
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50 typedef struct _SDL_Joystick SDL_Joystick;
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51
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52
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53 /* Function prototypes */
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54 /*
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55 * Count the number of joysticks attached to the system
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56 */
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57 extern DECLSPEC int SDLCALL SDL_NumJoysticks(void);
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58
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59 /*
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60 * Get the implementation dependent name of a joystick.
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61 * This can be called before any joysticks are opened.
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62 * If no name can be found, this function returns NULL.
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63 */
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64 extern DECLSPEC const char *SDLCALL SDL_JoystickName(int device_index);
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65
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66 /*
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67 * Open a joystick for use - the index passed as an argument refers to
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68 * the N'th joystick on the system. This index is the value which will
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69 * identify this joystick in future joystick events.
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70 *
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71 * This function returns a joystick identifier, or NULL if an error occurred.
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72 */
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73 extern DECLSPEC SDL_Joystick *SDLCALL SDL_JoystickOpen(int device_index);
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74
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75 /*
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76 * Returns 1 if the joystick has been opened, or 0 if it has not.
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77 */
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78 extern DECLSPEC int SDLCALL SDL_JoystickOpened(int device_index);
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79
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80 /*
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81 * Get the device index of an opened joystick.
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82 */
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83 extern DECLSPEC int SDLCALL SDL_JoystickIndex(SDL_Joystick * joystick);
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84
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85 /*
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86 * Get the number of general axis controls on a joystick
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87 */
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88 extern DECLSPEC int SDLCALL SDL_JoystickNumAxes(SDL_Joystick * joystick);
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89
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90 /*
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91 * Get the number of trackballs on a joystick
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92 * Joystick trackballs have only relative motion events associated
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93 * with them and their state cannot be polled.
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94 */
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95 extern DECLSPEC int SDLCALL SDL_JoystickNumBalls(SDL_Joystick * joystick);
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96
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97 /*
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98 * Get the number of POV hats on a joystick
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99 */
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100 extern DECLSPEC int SDLCALL SDL_JoystickNumHats(SDL_Joystick * joystick);
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101
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102 /*
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103 * Get the number of buttons on a joystick
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104 */
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105 extern DECLSPEC int SDLCALL SDL_JoystickNumButtons(SDL_Joystick * joystick);
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106
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107 /*
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108 * Update the current state of the open joysticks.
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109 * This is called automatically by the event loop if any joystick
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110 * events are enabled.
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111 */
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112 extern DECLSPEC void SDLCALL SDL_JoystickUpdate(void);
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113
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114 /*
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115 * Enable/disable joystick event polling.
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116 * If joystick events are disabled, you must call SDL_JoystickUpdate()
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117 * yourself and check the state of the joystick when you want joystick
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118 * information.
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119 * The state can be one of SDL_QUERY, SDL_ENABLE or SDL_IGNORE.
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120 */
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121 extern DECLSPEC int SDLCALL SDL_JoystickEventState(int state);
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122
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123 /*
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124 * Get the current state of an axis control on a joystick
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125 * The state is a value ranging from -32768 to 32767.
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126 * The axis indices start at index 0.
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127 */
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128 extern DECLSPEC Sint16 SDLCALL SDL_JoystickGetAxis(SDL_Joystick * joystick,
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129 int axis);
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130
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131 /*
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132 * Get the current state of a POV hat on a joystick
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133 * The return value is one of the following positions:
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134 */
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135 #define SDL_HAT_CENTERED 0x00
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136 #define SDL_HAT_UP 0x01
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137 #define SDL_HAT_RIGHT 0x02
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138 #define SDL_HAT_DOWN 0x04
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139 #define SDL_HAT_LEFT 0x08
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140 #define SDL_HAT_RIGHTUP (SDL_HAT_RIGHT|SDL_HAT_UP)
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141 #define SDL_HAT_RIGHTDOWN (SDL_HAT_RIGHT|SDL_HAT_DOWN)
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142 #define SDL_HAT_LEFTUP (SDL_HAT_LEFT|SDL_HAT_UP)
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143 #define SDL_HAT_LEFTDOWN (SDL_HAT_LEFT|SDL_HAT_DOWN)
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144 /*
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145 * The hat indices start at index 0.
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146 */
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147 extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetHat(SDL_Joystick * joystick,
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148 int hat);
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149
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150 /*
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151 * Get the ball axis change since the last poll
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152 * This returns 0, or -1 if you passed it invalid parameters.
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153 * The ball indices start at index 0.
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154 */
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155 extern DECLSPEC int SDLCALL SDL_JoystickGetBall(SDL_Joystick * joystick,
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156 int ball, int *dx, int *dy);
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157
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158 /*
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159 * Get the current state of a button on a joystick
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160 * The button indices start at index 0.
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161 */
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162 extern DECLSPEC Uint8 SDLCALL SDL_JoystickGetButton(SDL_Joystick * joystick,
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163 int button);
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164
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165 /*
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166 * Close a joystick previously opened with SDL_JoystickOpen()
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167 */
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168 extern DECLSPEC void SDLCALL SDL_JoystickClose(SDL_Joystick * joystick);
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169
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170
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171 /* Ends C function definitions when using C++ */
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172 #ifdef __cplusplus
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173 /* *INDENT-OFF* */
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174 }
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175 /* *INDENT-ON* */
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176 #endif
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177 #include "close_code.h"
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178
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179 #endif /* _SDL_joystick_h */
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180
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181 /* vi: set ts=4 sw=4 expandtab: */