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annotate include/SDL_joystick.h @ 4590:1ad70fb49fcb

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Fix so many things that there is little place in this column to list them all but the result is that blending modes just work now for drawing primitives. Fixes involved: 1. Fix handling of alpha channel when SDL_BLENDMODE_NONE is set. 2. Make xrendercolor use floating-point values for color channels and then convert to 16 bit ints. 3. Fix handling of visuals in SDL_x11modes.c so that a 32 bit ARGB visual is used. 4. Fix the background pixel value in SDL_x11window.c so that the window background has an alpha value of 0xFF and not 0.
author Sunny Sachanandani <sunnysachanandani@gmail.com>
date Fri, 09 Jul 2010 21:36:41 +0530
parents f7b03b6838cb
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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
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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: */