annotate src/joystick/win32/SDL_mmjoystick.c @ 1662:782fd950bd46 SDL-1.3

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 14717b52abc0
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_WINMM
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25
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26 /* Win32 MultiMedia Joystick driver, contributed by Andrei de A. Formiga */
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27
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28 #define WIN32_LEAN_AND_MEAN
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29 #include <windows.h>
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30 #include <mmsystem.h>
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31 #include <regstr.h>
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32
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33 #include "SDL_events.h"
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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 #define MAX_JOYSTICKS 16
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39 #define MAX_AXES 6 /* each joystick can have up to 6 axes */
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40 #define MAX_BUTTONS 32 /* and 32 buttons */
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41 #define AXIS_MIN -32768 /* minimum value for axis coordinate */
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42 #define AXIS_MAX 32767 /* maximum value for axis coordinate */
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43 /* limit axis to 256 possible positions to filter out noise */
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44 #define JOY_AXIS_THRESHOLD (((AXIS_MAX)-(AXIS_MIN))/256)
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45 #define JOY_BUTTON_FLAG(n) (1<<n)
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46
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47
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48 /* array to hold joystick ID values */
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49 static UINT SYS_JoystickID[MAX_JOYSTICKS];
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50 static JOYCAPS SYS_Joystick[MAX_JOYSTICKS];
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51 static char *SYS_JoystickName[MAX_JOYSTICKS];
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52
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53 /* The private structure used to keep track of a joystick */
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54 struct joystick_hwdata
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55 {
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56 /* joystick ID */
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57 UINT id;
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58
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59 /* values used to translate device-specific coordinates into
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60 SDL-standard ranges */
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61 struct _transaxis
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62 {
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63 int offset;
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64 float scale;
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65 } transaxis[6];
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66 };
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67
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68 /* Convert a win32 Multimedia API return code to a text message */
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69 static void SetMMerror (char *function, int code);
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71
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72 static char *
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73 GetJoystickName (int index, const char *szRegKey)
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74 {
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75 /* added 7/24/2004 by Eckhard Stolberg */
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76 /*
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77 see if there is a joystick for the current
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78 index (1-16) listed in the registry
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79 */
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80 char *name = NULL;
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81 HKEY hKey;
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82 DWORD regsize;
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83 LONG regresult;
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84 unsigned char regkey[256];
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85 unsigned char regvalue[256];
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86 unsigned char regname[256];
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87
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88 SDL_snprintf ((char *) regkey, SDL_arraysize (regkey), "%s\\%s\\%s",
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89 REGSTR_PATH_JOYCONFIG, szRegKey, REGSTR_KEY_JOYCURR);
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90 regresult = RegOpenKeyExA (HKEY_LOCAL_MACHINE,
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91 (LPTSTR) & regkey, 0, KEY_READ, &hKey);
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92 if (regresult == ERROR_SUCCESS) {
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93 /*
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94 find the registry key name for the
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95 joystick's properties
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96 */
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97 regsize = sizeof (regname);
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98 SDL_snprintf ((char *) regvalue, SDL_arraysize (regvalue),
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99 "Joystick%d%s", index + 1, REGSTR_VAL_JOYOEMNAME);
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100 regresult = RegQueryValueExA (hKey,
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101 (char *) regvalue, 0, 0,
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102 (LPBYTE) & regname,
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103 (LPDWORD) & regsize);
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104 RegCloseKey (hKey);
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105 if (regresult == ERROR_SUCCESS) {
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106 /* open that registry key */
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107 SDL_snprintf ((char *) regkey, SDL_arraysize (regkey),
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108 "%s\\%s", REGSTR_PATH_JOYOEM, regname);
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109 regresult =
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110 RegOpenKeyExA (HKEY_LOCAL_MACHINE, (char *) regkey, 0,
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111 KEY_READ, &hKey);
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112 if (regresult == ERROR_SUCCESS) {
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113 /* find the size for the OEM name text */
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114 regsize = sizeof (regvalue);
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115 regresult =
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116 RegQueryValueExA (hKey,
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117 REGSTR_VAL_JOYOEMNAME,
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118 0, 0, NULL, (LPDWORD) & regsize);
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119 if (regresult == ERROR_SUCCESS) {
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120 /*
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121 allocate enough memory
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122 for the OEM name text ...
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123 */
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124 name = (char *) SDL_malloc (regsize);
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125 /* ... and read it from the registry */
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126 regresult =
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127 RegQueryValueExA (hKey,
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128 REGSTR_VAL_JOYOEMNAME, 0, 0,
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129 (LPBYTE) name, (LPDWORD) & regsize);
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130 RegCloseKey (hKey);
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131 }
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132 }
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133 }
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134 }
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135 return (name);
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136 }
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137
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138 /* Function to scan the system for joysticks.
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139 * This function should set SDL_numjoysticks to the number of available
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140 * joysticks. Joystick 0 should be the system default joystick.
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141 * It should return 0, or -1 on an unrecoverable fatal error.
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142 */
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143 int
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144 SDL_SYS_JoystickInit (void)
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145 {
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146 int i;
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147 int maxdevs;
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148 int numdevs;
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149 JOYINFOEX joyinfo;
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150 JOYCAPS joycaps;
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151 MMRESULT result;
0
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152
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153 /* Reset the joystick ID & name mapping tables */
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154 for (i = 0; i < MAX_JOYSTICKS; ++i) {
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155 SYS_JoystickID[i] = 0;
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156 SYS_JoystickName[i] = NULL;
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157 }
531
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158
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159 /* Loop over all potential joystick devices */
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160 numdevs = 0;
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161 maxdevs = joyGetNumDevs ();
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162 for (i = JOYSTICKID1; i < maxdevs && numdevs < MAX_JOYSTICKS; ++i) {
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163
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164 joyinfo.dwSize = sizeof (joyinfo);
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165 joyinfo.dwFlags = JOY_RETURNALL;
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166 result = joyGetPosEx (SYS_JoystickID[i], &joyinfo);
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167 if (result == JOYERR_NOERROR) {
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168 result = joyGetDevCaps (i, &joycaps, sizeof (joycaps));
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169 if (result == JOYERR_NOERROR) {
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170 SYS_JoystickID[numdevs] = i;
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171 SYS_Joystick[numdevs] = joycaps;
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172 SYS_JoystickName[numdevs] =
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173 GetJoystickName (i, joycaps.szRegKey);
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174 numdevs++;
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175 }
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176 }
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177 }
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178 return (numdevs);
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179 }
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180
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181 /* Function to get the device-dependent name of a joystick */
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182 const char *
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183 SDL_SYS_JoystickName (int index)
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184 {
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185 if (SYS_JoystickName[index] != NULL) {
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186 return (SYS_JoystickName[index]);
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187 } else {
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188 return (SYS_Joystick[index].szPname);
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189 }
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190 }
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191
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192 /* Function to open a joystick for use.
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193 The joystick to open is specified by the index field of the joystick.
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194 This should fill the nbuttons and naxes fields of the joystick structure.
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195 It returns 0, or -1 if there is an error.
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196 */
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197 int
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198 SDL_SYS_JoystickOpen (SDL_Joystick * joystick)
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199 {
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200 int index, i;
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201 int caps_flags[MAX_AXES - 2] =
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202 { JOYCAPS_HASZ, JOYCAPS_HASR, JOYCAPS_HASU, JOYCAPS_HASV };
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203 int axis_min[MAX_AXES], axis_max[MAX_AXES];
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204
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205
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206 /* shortcut */
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207 index = joystick->index;
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208 axis_min[0] = SYS_Joystick[index].wXmin;
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209 axis_max[0] = SYS_Joystick[index].wXmax;
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210 axis_min[1] = SYS_Joystick[index].wYmin;
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211 axis_max[1] = SYS_Joystick[index].wYmax;
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212 axis_min[2] = SYS_Joystick[index].wZmin;
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213 axis_max[2] = SYS_Joystick[index].wZmax;
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214 axis_min[3] = SYS_Joystick[index].wRmin;
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215 axis_max[3] = SYS_Joystick[index].wRmax;
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216 axis_min[4] = SYS_Joystick[index].wUmin;
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217 axis_max[4] = SYS_Joystick[index].wUmax;
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218 axis_min[5] = SYS_Joystick[index].wVmin;
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219 axis_max[5] = SYS_Joystick[index].wVmax;
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220
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221 /* allocate memory for system specific hardware data */
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222 joystick->hwdata =
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223 (struct joystick_hwdata *) SDL_malloc (sizeof (*joystick->hwdata));
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224 if (joystick->hwdata == NULL) {
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225 SDL_OutOfMemory ();
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226 return (-1);
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227 }
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228 SDL_memset (joystick->hwdata, 0, sizeof (*joystick->hwdata));
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229
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230 /* set hardware data */
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231 joystick->hwdata->id = SYS_JoystickID[index];
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232 for (i = 0; i < MAX_AXES; ++i) {
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233 if ((i < 2) || (SYS_Joystick[index].wCaps & caps_flags[i - 2])) {
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234 joystick->hwdata->transaxis[i].offset = AXIS_MIN - axis_min[i];
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235 joystick->hwdata->transaxis[i].scale =
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236 (float) (AXIS_MAX - AXIS_MIN) / (axis_max[i] - axis_min[i]);
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237 } else {
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238 joystick->hwdata->transaxis[i].offset = 0;
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239 joystick->hwdata->transaxis[i].scale = 1.0; /* Just in case */
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240 }
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241 }
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242
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243 /* fill nbuttons, naxes, and nhats fields */
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244 joystick->nbuttons = SYS_Joystick[index].wNumButtons;
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245 joystick->naxes = SYS_Joystick[index].wNumAxes;
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246 if (SYS_Joystick[index].wCaps & JOYCAPS_HASPOV) {
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247 joystick->nhats = 1;
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248 } else {
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249 joystick->nhats = 0;
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250 }
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251 return (0);
0
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252 }
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253
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254 static Uint8
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255 TranslatePOV (DWORD value)
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256 {
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257 Uint8 pos;
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258
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259 pos = SDL_HAT_CENTERED;
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260 if (value != JOY_POVCENTERED) {
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261 if ((value > JOY_POVLEFT) || (value < JOY_POVRIGHT)) {
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262 pos |= SDL_HAT_UP;
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263 }
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264 if ((value > JOY_POVFORWARD) && (value < JOY_POVBACKWARD)) {
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265 pos |= SDL_HAT_RIGHT;
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266 }
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267 if ((value > JOY_POVRIGHT) && (value < JOY_POVLEFT)) {
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268 pos |= SDL_HAT_DOWN;
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269 }
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270 if (value > JOY_POVBACKWARD) {
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271 pos |= SDL_HAT_LEFT;
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272 }
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273 }
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274 return (pos);
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275 }
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276
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277 /* Function to update the state of a joystick - called as a device poll.
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278 * This function shouldn't update the joystick structure directly,
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279 * but instead should call SDL_PrivateJoystick*() to deliver events
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280 * and update joystick device state.
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281 */
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282 void
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283 SDL_SYS_JoystickUpdate (SDL_Joystick * joystick)
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284 {
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285 MMRESULT result;
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286 int i;
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287 DWORD flags[MAX_AXES] = { JOY_RETURNX, JOY_RETURNY, JOY_RETURNZ,
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288 JOY_RETURNR, JOY_RETURNU, JOY_RETURNV
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289 };
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290 DWORD pos[MAX_AXES];
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291 struct _transaxis *transaxis;
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292 int value, change;
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293 JOYINFOEX joyinfo;
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294
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295 joyinfo.dwSize = sizeof (joyinfo);
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296 joyinfo.dwFlags = JOY_RETURNALL | JOY_RETURNPOVCTS;
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297 if (!joystick->hats) {
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298 joyinfo.dwFlags &= ~(JOY_RETURNPOV | JOY_RETURNPOVCTS);
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299 }
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300 result = joyGetPosEx (joystick->hwdata->id, &joyinfo);
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301 if (result != JOYERR_NOERROR) {
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302 SetMMerror ("joyGetPosEx", result);
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303 return;
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304 }
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305
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306 /* joystick motion events */
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307 pos[0] = joyinfo.dwXpos;
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308 pos[1] = joyinfo.dwYpos;
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309 pos[2] = joyinfo.dwZpos;
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310 pos[3] = joyinfo.dwRpos;
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311 pos[4] = joyinfo.dwUpos;
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312 pos[5] = joyinfo.dwVpos;
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313
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314 transaxis = joystick->hwdata->transaxis;
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315 for (i = 0; i < joystick->naxes; i++) {
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316 if (joyinfo.dwFlags & flags[i]) {
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317 value =
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318 (int) (((float) pos[i] +
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319 transaxis[i].offset) * transaxis[i].scale);
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320 change = (value - joystick->axes[i]);
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321 if ((change < -JOY_AXIS_THRESHOLD)
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322 || (change > JOY_AXIS_THRESHOLD)) {
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323 SDL_PrivateJoystickAxis (joystick, (Uint8) i, (Sint16) value);
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324 }
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325 }
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326 }
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327
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328 /* joystick button events */
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329 if (joyinfo.dwFlags & JOY_RETURNBUTTONS) {
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330 for (i = 0; i < joystick->nbuttons; ++i) {
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331 if (joyinfo.dwButtons & JOY_BUTTON_FLAG (i)) {
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332 if (!joystick->buttons[i]) {
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333 SDL_PrivateJoystickButton (joystick, (Uint8) i,
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334 SDL_PRESSED);
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335 }
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336 } else {
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337 if (joystick->buttons[i]) {
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338 SDL_PrivateJoystickButton (joystick, (Uint8) i,
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339 SDL_RELEASED);
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340 }
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341 }
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342 }
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343 }
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344
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345 /* joystick hat events */
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346 if (joyinfo.dwFlags & JOY_RETURNPOV) {
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347 Uint8 pos;
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348
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349 pos = TranslatePOV (joyinfo.dwPOV);
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350 if (pos != joystick->hats[0]) {
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351 SDL_PrivateJoystickHat (joystick, 0, pos);
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352 }
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353 }
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354 }
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355
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356 /* Function to close a joystick after use */
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357 void
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358 SDL_SYS_JoystickClose (SDL_Joystick * joystick)
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diff changeset
359 {
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360 if (joystick->hwdata != NULL) {
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361 /* free system specific hardware data */
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362 SDL_free (joystick->hwdata);
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363 }
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364 }
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365
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366 /* Function to perform any system-specific joystick related cleanup */
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367 void
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368 SDL_SYS_JoystickQuit (void)
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369 {
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370 int i;
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371 for (i = 0; i < MAX_JOYSTICKS; i++) {
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372 if (SYS_JoystickName[i] != NULL) {
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373 SDL_free (SYS_JoystickName[i]);
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374 }
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375 }
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376 }
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377
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378
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379 /* implementation functions */
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380 void
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381 SetMMerror (char *function, int code)
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382 {
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383 static char *error;
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384 static char errbuf[1024];
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385
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386 errbuf[0] = 0;
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387 switch (code) {
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388 case MMSYSERR_NODRIVER:
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389 error = "Joystick driver not present";
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390 break;
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391
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392 case MMSYSERR_INVALPARAM:
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393 case JOYERR_PARMS:
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394 error = "Invalid parameter(s)";
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395 break;
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396
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397 case MMSYSERR_BADDEVICEID:
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398 error = "Bad device ID";
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399 break;
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400
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401 case JOYERR_UNPLUGGED:
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402 error = "Joystick not attached";
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403 break;
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404
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405 case JOYERR_NOCANDO:
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406 error = "Can't capture joystick input";
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407 break;
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408
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409 default:
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410 SDL_snprintf (errbuf, SDL_arraysize (errbuf),
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411 "%s: Unknown Multimedia system error: 0x%x",
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412 function, code);
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413 break;
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414 }
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415
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416 if (!errbuf[0]) {
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417 SDL_snprintf (errbuf, SDL_arraysize (errbuf), "%s: %s", function,
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418 error);
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419 }
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420 SDL_SetError ("%s", errbuf);
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421 }
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422
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423 #endif /* SDL_JOYSTICK_WINMM */
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424 /* vi: set ts=4 sw=4 expandtab: */