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annotate src/joystick/win32/SDL_mmjoystick.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
children
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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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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 #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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70
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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, (LPDWORD) & regsize);
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103 RegCloseKey(hKey);
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104 if (regresult == ERROR_SUCCESS) {
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105 /* open that registry key */
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106 SDL_snprintf((char *) regkey, SDL_arraysize(regkey),
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107 "%s\\%s", REGSTR_PATH_JOYOEM, regname);
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108 regresult =
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109 RegOpenKeyExA(HKEY_LOCAL_MACHINE, (char *) regkey, 0,
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110 KEY_READ, &hKey);
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111 if (regresult == ERROR_SUCCESS) {
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112 /* find the size for the OEM name text */
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113 regsize = sizeof(regvalue);
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114 regresult =
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115 RegQueryValueExA(hKey,
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116 REGSTR_VAL_JOYOEMNAME,
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117 0, 0, NULL, (LPDWORD) & regsize);
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118 if (regresult == ERROR_SUCCESS) {
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119 /*
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120 allocate enough memory
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121 for the OEM name text ...
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122 */
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123 name = (char *) SDL_malloc(regsize);
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124 /* ... and read it from the registry */
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125 regresult =
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126 RegQueryValueExA(hKey,
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127 REGSTR_VAL_JOYOEMNAME, 0, 0,
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128 (LPBYTE) name, (LPDWORD) & regsize);
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129 RegCloseKey(hKey);
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130 }
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131 }
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132 }
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133 }
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134 return (name);
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135 }
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136
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137 /* Function to scan the system for joysticks.
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138 * This function should set SDL_numjoysticks to the number of available
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139 * joysticks. Joystick 0 should be the system default joystick.
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140 * It should return 0, or -1 on an unrecoverable fatal error.
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141 */
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142 int
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143 SDL_SYS_JoystickInit(void)
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144 {
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145 int i;
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146 int maxdevs;
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147 int numdevs;
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148 JOYINFOEX joyinfo;
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149 JOYCAPS joycaps;
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150 MMRESULT result;
0
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151
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152 /* Reset the joystick ID & name mapping tables */
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153 for (i = 0; i < MAX_JOYSTICKS; ++i) {
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154 SYS_JoystickID[i] = 0;
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155 SYS_JoystickName[i] = NULL;
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156 }
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157
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158 /* Loop over all potential joystick devices */
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159 numdevs = 0;
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160 maxdevs = joyGetNumDevs();
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161 for (i = JOYSTICKID1; i < maxdevs && numdevs < MAX_JOYSTICKS; ++i) {
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162
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163 joyinfo.dwSize = sizeof(joyinfo);
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164 joyinfo.dwFlags = JOY_RETURNALL;
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165 result = joyGetPosEx(SYS_JoystickID[i], &joyinfo);
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166 if (result == JOYERR_NOERROR) {
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167 result = joyGetDevCaps(i, &joycaps, sizeof(joycaps));
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168 if (result == JOYERR_NOERROR) {
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169 SYS_JoystickID[numdevs] = i;
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170 SYS_Joystick[numdevs] = joycaps;
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171 SYS_JoystickName[numdevs] =
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172 GetJoystickName(i, joycaps.szRegKey);
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173 numdevs++;
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174 }
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175 }
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176 }
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177 return (numdevs);
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178 }
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179
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180 /* Function to get the device-dependent name of a joystick */
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181 const char *
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182 SDL_SYS_JoystickName(int index)
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183 {
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184 if (SYS_JoystickName[index] != NULL) {
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185 return (SYS_JoystickName[index]);
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186 } else {
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187 return (SYS_Joystick[index].szPname);
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188 }
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189 }
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190
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191 /* Function to open a joystick for use.
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192 The joystick to open is specified by the index field of the joystick.
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193 This should fill the nbuttons and naxes fields of the joystick structure.
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194 It returns 0, or -1 if there is an error.
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195 */
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196 int
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197 SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
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198 {
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199 int index, i;
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200 int caps_flags[MAX_AXES - 2] =
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201 { JOYCAPS_HASZ, JOYCAPS_HASR, JOYCAPS_HASU, JOYCAPS_HASV };
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202 int axis_min[MAX_AXES], axis_max[MAX_AXES];
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203
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204
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205 /* shortcut */
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206 index = joystick->index;
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207 axis_min[0] = SYS_Joystick[index].wXmin;
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208 axis_max[0] = SYS_Joystick[index].wXmax;
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209 axis_min[1] = SYS_Joystick[index].wYmin;
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210 axis_max[1] = SYS_Joystick[index].wYmax;
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211 axis_min[2] = SYS_Joystick[index].wZmin;
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212 axis_max[2] = SYS_Joystick[index].wZmax;
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213 axis_min[3] = SYS_Joystick[index].wRmin;
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214 axis_max[3] = SYS_Joystick[index].wRmax;
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215 axis_min[4] = SYS_Joystick[index].wUmin;
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216 axis_max[4] = SYS_Joystick[index].wUmax;
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217 axis_min[5] = SYS_Joystick[index].wVmin;
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218 axis_max[5] = SYS_Joystick[index].wVmax;
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219
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220 /* allocate memory for system specific hardware data */
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221 joystick->hwdata =
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222 (struct joystick_hwdata *) SDL_malloc(sizeof(*joystick->hwdata));
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223 if (joystick->hwdata == NULL) {
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224 SDL_OutOfMemory();
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225 return (-1);
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226 }
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227 SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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228
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229 /* set hardware data */
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230 joystick->hwdata->id = SYS_JoystickID[index];
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231 for (i = 0; i < MAX_AXES; ++i) {
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232 if ((i < 2) || (SYS_Joystick[index].wCaps & caps_flags[i - 2])) {
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233 joystick->hwdata->transaxis[i].offset = AXIS_MIN - axis_min[i];
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234 joystick->hwdata->transaxis[i].scale =
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235 (float) (AXIS_MAX - AXIS_MIN) / (axis_max[i] - axis_min[i]);
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236 } else {
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237 joystick->hwdata->transaxis[i].offset = 0;
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238 joystick->hwdata->transaxis[i].scale = 1.0; /* Just in case */
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239 }
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240 }
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241
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242 /* fill nbuttons, naxes, and nhats fields */
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243 joystick->nbuttons = SYS_Joystick[index].wNumButtons;
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244 joystick->naxes = SYS_Joystick[index].wNumAxes;
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245 if (SYS_Joystick[index].wCaps & JOYCAPS_HASPOV) {
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246 joystick->nhats = 1;
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247 } else {
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248 joystick->nhats = 0;
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249 }
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250 return (0);
0
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251 }
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252
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253 static Uint8
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254 TranslatePOV(DWORD value)
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255 {
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256 Uint8 pos;
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257
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258 pos = SDL_HAT_CENTERED;
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259 if (value != JOY_POVCENTERED) {
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260 if ((value > JOY_POVLEFT) || (value < JOY_POVRIGHT)) {
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261 pos |= SDL_HAT_UP;
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262 }
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263 if ((value > JOY_POVFORWARD) && (value < JOY_POVBACKWARD)) {
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264 pos |= SDL_HAT_RIGHT;
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265 }
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266 if ((value > JOY_POVRIGHT) && (value < JOY_POVLEFT)) {
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267 pos |= SDL_HAT_DOWN;
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268 }
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269 if (value > JOY_POVBACKWARD) {
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270 pos |= SDL_HAT_LEFT;
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271 }
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272 }
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273 return (pos);
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274 }
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275
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276 /* Function to update the state of a joystick - called as a device poll.
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277 * This function shouldn't update the joystick structure directly,
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278 * but instead should call SDL_PrivateJoystick*() to deliver events
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279 * and update joystick device state.
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280 */
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281 void
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282 SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
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283 {
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284 MMRESULT result;
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285 int i;
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286 DWORD flags[MAX_AXES] = { JOY_RETURNX, JOY_RETURNY, JOY_RETURNZ,
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287 JOY_RETURNR, JOY_RETURNU, JOY_RETURNV
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288 };
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289 DWORD pos[MAX_AXES];
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290 struct _transaxis *transaxis;
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291 int value, change;
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292 JOYINFOEX joyinfo;
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293
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294 joyinfo.dwSize = sizeof(joyinfo);
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295 joyinfo.dwFlags = JOY_RETURNALL | JOY_RETURNPOVCTS;
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296 if (!joystick->hats) {
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297 joyinfo.dwFlags &= ~(JOY_RETURNPOV | JOY_RETURNPOVCTS);
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298 }
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299 result = joyGetPosEx(joystick->hwdata->id, &joyinfo);
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300 if (result != JOYERR_NOERROR) {
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301 SetMMerror("joyGetPosEx", result);
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302 return;
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303 }
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304
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305 /* joystick motion events */
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306 pos[0] = joyinfo.dwXpos;
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307 pos[1] = joyinfo.dwYpos;
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308 pos[2] = joyinfo.dwZpos;
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309 pos[3] = joyinfo.dwRpos;
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310 pos[4] = joyinfo.dwUpos;
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311 pos[5] = joyinfo.dwVpos;
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312
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313 transaxis = joystick->hwdata->transaxis;
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314 for (i = 0; i < joystick->naxes; i++) {
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315 if (joyinfo.dwFlags & flags[i]) {
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316 value =
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317 (int) (((float) pos[i] +
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318 transaxis[i].offset) * transaxis[i].scale);
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319 change = (value - joystick->axes[i]);
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320 if ((change < -JOY_AXIS_THRESHOLD)
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321 || (change > JOY_AXIS_THRESHOLD)) {
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322 SDL_PrivateJoystickAxis(joystick, (Uint8) i, (Sint16) value);
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323 }
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324 }
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325 }
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326
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327 /* joystick button events */
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328 if (joyinfo.dwFlags & JOY_RETURNBUTTONS) {
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329 for (i = 0; i < joystick->nbuttons; ++i) {
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330 if (joyinfo.dwButtons & JOY_BUTTON_FLAG(i)) {
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331 if (!joystick->buttons[i]) {
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332 SDL_PrivateJoystickButton(joystick, (Uint8) i,
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333 SDL_PRESSED);
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334 }
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335 } else {
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336 if (joystick->buttons[i]) {
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337 SDL_PrivateJoystickButton(joystick, (Uint8) i,
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338 SDL_RELEASED);
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339 }
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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 /* joystick hat events */
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345 if (joyinfo.dwFlags & JOY_RETURNPOV) {
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346 Uint8 pos;
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347
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348 pos = TranslatePOV(joyinfo.dwPOV);
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349 if (pos != joystick->hats[0]) {
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350 SDL_PrivateJoystickHat(joystick, 0, pos);
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351 }
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352 }
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353 }
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354
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355 /* Function to close a joystick after use */
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356 void
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357 SDL_SYS_JoystickClose(SDL_Joystick * joystick)
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358 {
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359 if (joystick->hwdata != NULL) {
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360 /* free system specific hardware data */
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361 SDL_free(joystick->hwdata);
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362 }
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363 }
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364
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365 /* Function to perform any system-specific joystick related cleanup */
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366 void
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367 SDL_SYS_JoystickQuit(void)
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368 {
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369 int i;
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370 for (i = 0; i < MAX_JOYSTICKS; i++) {
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371 if (SYS_JoystickName[i] != NULL) {
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372 SDL_free(SYS_JoystickName[i]);
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373 }
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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 /* implementation functions */
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379 void
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380 SetMMerror(char *function, int code)
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381 {
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382 static char *error;
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383 static char errbuf[1024];
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384
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385 errbuf[0] = 0;
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386 switch (code) {
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387 case MMSYSERR_NODRIVER:
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388 error = "Joystick driver not present";
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389 break;
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390
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391 case MMSYSERR_INVALPARAM:
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392 case JOYERR_PARMS:
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393 error = "Invalid parameter(s)";
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394 break;
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395
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396 case MMSYSERR_BADDEVICEID:
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397 error = "Bad device ID";
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398 break;
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399
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400 case JOYERR_UNPLUGGED:
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401 error = "Joystick not attached";
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402 break;
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403
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404 case JOYERR_NOCANDO:
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405 error = "Can't capture joystick input";
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406 break;
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407
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408 default:
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409 SDL_snprintf(errbuf, SDL_arraysize(errbuf),
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410 "%s: Unknown Multimedia system error: 0x%x",
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411 function, code);
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412 break;
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413 }
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414
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415 if (!errbuf[0]) {
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416 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: %s", function,
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417 error);
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418 }
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419 SDL_SetError("%s", errbuf);
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420 }
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421
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422 #endif /* SDL_JOYSTICK_WINMM */
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423 /* vi: set ts=4 sw=4 expandtab: */