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annotate src/joystick/win32/SDL_mmjoystick.c @ 2334:80ceefc00ada gsoc2008_iphone

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author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Fri, 11 Jul 2008 00:21:45 +0000
parents cbe06fa842cd
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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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 hTopKey;
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82 HKEY hKey;
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83 DWORD regsize;
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84 LONG regresult;
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85 char regkey[256];
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86 char regvalue[256];
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87 char regname[256];
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88
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89 SDL_snprintf(regkey, SDL_arraysize(regkey), "%s\\%s\\%s",
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90 REGSTR_PATH_JOYCONFIG, szRegKey, REGSTR_KEY_JOYCURR);
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91 hTopKey = HKEY_LOCAL_MACHINE;
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92 regresult = RegOpenKeyExA(hTopKey, regkey, 0, KEY_READ, &hKey);
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93 if (regresult != ERROR_SUCCESS) {
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94 hTopKey = HKEY_CURRENT_USER;
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95 regresult = RegOpenKeyExA(hTopKey, regkey, 0, KEY_READ, &hKey);
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96 }
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97 if (regresult != ERROR_SUCCESS) {
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98 return NULL;
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99 }
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100
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101 /* find the registry key name for the joystick's properties */
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102 regsize = sizeof(regname);
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103 SDL_snprintf(regvalue, SDL_arraysize(regvalue), "Joystick%d%s", index + 1,
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104 REGSTR_VAL_JOYOEMNAME);
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105 regresult =
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106 RegQueryValueExA(hKey, regvalue, 0, 0, (LPBYTE) regname, &regsize);
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107 RegCloseKey(hKey);
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108
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109 if (regresult != ERROR_SUCCESS) {
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110 return NULL;
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111 }
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112
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113 /* open that registry key */
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114 SDL_snprintf(regkey, SDL_arraysize(regkey), "%s\\%s", REGSTR_PATH_JOYOEM,
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115 regname);
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116 regresult = RegOpenKeyExA(hTopKey, regkey, 0, KEY_READ, &hKey);
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117 if (regresult != ERROR_SUCCESS) {
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118 return NULL;
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119 }
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120
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121 /* find the size for the OEM name text */
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122 regsize = sizeof(regvalue);
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123 regresult =
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124 RegQueryValueExA(hKey, REGSTR_VAL_JOYOEMNAME, 0, 0, NULL, &regsize);
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125 if (regresult == ERROR_SUCCESS) {
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126 /* allocate enough memory for the OEM name text ... */
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127 name = (char *) SDL_malloc(regsize);
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128 if (name) {
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129 /* ... and read it from the registry */
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130 regresult = RegQueryValueExA(hKey,
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131 REGSTR_VAL_JOYOEMNAME, 0, 0,
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132 (LPBYTE) name, &regsize);
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133 }
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134 }
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135 RegCloseKey(hKey);
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136
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137 return (name);
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138 }
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139
0
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140 /* Function to scan the system for joysticks.
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141 * This function should set SDL_numjoysticks to the number of available
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142 * joysticks. Joystick 0 should be the system default joystick.
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143 * It should return 0, or -1 on an unrecoverable fatal error.
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144 */
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145 int
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146 SDL_SYS_JoystickInit(void)
0
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147 {
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148 int i;
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149 int maxdevs;
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150 int numdevs;
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151 JOYINFOEX joyinfo;
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152 JOYCAPS joycaps;
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153 MMRESULT result;
0
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154
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155 /* Reset the joystick ID & name mapping tables */
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156 for (i = 0; i < MAX_JOYSTICKS; ++i) {
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157 SYS_JoystickID[i] = 0;
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158 SYS_JoystickName[i] = NULL;
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159 }
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160
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161 /* Loop over all potential joystick devices */
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162 numdevs = 0;
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163 maxdevs = joyGetNumDevs();
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164 for (i = JOYSTICKID1; i < maxdevs && numdevs < MAX_JOYSTICKS; ++i) {
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165
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166 joyinfo.dwSize = sizeof(joyinfo);
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167 joyinfo.dwFlags = JOY_RETURNALL;
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168 result = joyGetPosEx(i, &joyinfo);
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169 if (result == JOYERR_NOERROR) {
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170 result = joyGetDevCaps(i, &joycaps, sizeof(joycaps));
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171 if (result == JOYERR_NOERROR) {
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172 SYS_JoystickID[numdevs] = i;
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173 SYS_Joystick[numdevs] = joycaps;
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174 SYS_JoystickName[numdevs] =
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175 GetJoystickName(i, joycaps.szRegKey);
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176 numdevs++;
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177 }
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178 }
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179 }
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180 return (numdevs);
0
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181 }
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182
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183 /* Function to get the device-dependent name of a joystick */
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184 const char *
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185 SDL_SYS_JoystickName(int index)
0
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186 {
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187 if (SYS_JoystickName[index] != NULL) {
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188 return (SYS_JoystickName[index]);
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189 } else {
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190 return (SYS_Joystick[index].szPname);
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191 }
0
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192 }
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193
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194 /* Function to open a joystick for use.
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195 The joystick to open is specified by the index field of the joystick.
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196 This should fill the nbuttons and naxes fields of the joystick structure.
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197 It returns 0, or -1 if there is an error.
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198 */
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199 int
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200 SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
0
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201 {
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202 int index, i;
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203 int caps_flags[MAX_AXES - 2] =
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204 { JOYCAPS_HASZ, JOYCAPS_HASR, JOYCAPS_HASU, JOYCAPS_HASV };
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205 int axis_min[MAX_AXES], axis_max[MAX_AXES];
0
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206
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207
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208 /* shortcut */
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209 index = joystick->index;
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210 axis_min[0] = SYS_Joystick[index].wXmin;
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211 axis_max[0] = SYS_Joystick[index].wXmax;
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212 axis_min[1] = SYS_Joystick[index].wYmin;
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213 axis_max[1] = SYS_Joystick[index].wYmax;
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214 axis_min[2] = SYS_Joystick[index].wZmin;
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215 axis_max[2] = SYS_Joystick[index].wZmax;
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216 axis_min[3] = SYS_Joystick[index].wRmin;
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217 axis_max[3] = SYS_Joystick[index].wRmax;
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218 axis_min[4] = SYS_Joystick[index].wUmin;
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219 axis_max[4] = SYS_Joystick[index].wUmax;
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220 axis_min[5] = SYS_Joystick[index].wVmin;
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221 axis_max[5] = SYS_Joystick[index].wVmax;
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222
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223 /* allocate memory for system specific hardware data */
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224 joystick->hwdata =
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225 (struct joystick_hwdata *) SDL_malloc(sizeof(*joystick->hwdata));
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226 if (joystick->hwdata == NULL) {
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227 SDL_OutOfMemory();
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228 return (-1);
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229 }
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230 SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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231
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232 /* set hardware data */
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233 joystick->hwdata->id = SYS_JoystickID[index];
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234 for (i = 0; i < MAX_AXES; ++i) {
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235 if ((i < 2) || (SYS_Joystick[index].wCaps & caps_flags[i - 2])) {
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236 joystick->hwdata->transaxis[i].offset = AXIS_MIN - axis_min[i];
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237 joystick->hwdata->transaxis[i].scale =
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238 (float) (AXIS_MAX - AXIS_MIN) / (axis_max[i] - axis_min[i]);
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239 } else {
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240 joystick->hwdata->transaxis[i].offset = 0;
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241 joystick->hwdata->transaxis[i].scale = 1.0; /* Just in case */
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242 }
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243 }
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244
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245 /* fill nbuttons, naxes, and nhats fields */
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246 joystick->nbuttons = SYS_Joystick[index].wNumButtons;
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247 joystick->naxes = SYS_Joystick[index].wNumAxes;
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248 if (SYS_Joystick[index].wCaps & JOYCAPS_HASPOV) {
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249 joystick->nhats = 1;
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250 } else {
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251 joystick->nhats = 0;
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252 }
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253 return (0);
0
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254 }
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255
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256 static Uint8
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257 TranslatePOV(DWORD value)
0
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258 {
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259 Uint8 pos;
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260
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261 pos = SDL_HAT_CENTERED;
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262 if (value != JOY_POVCENTERED) {
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263 if ((value > JOY_POVLEFT) || (value < JOY_POVRIGHT)) {
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264 pos |= SDL_HAT_UP;
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265 }
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266 if ((value > JOY_POVFORWARD) && (value < JOY_POVBACKWARD)) {
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267 pos |= SDL_HAT_RIGHT;
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268 }
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269 if ((value > JOY_POVRIGHT) && (value < JOY_POVLEFT)) {
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270 pos |= SDL_HAT_DOWN;
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271 }
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272 if (value > JOY_POVBACKWARD) {
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273 pos |= SDL_HAT_LEFT;
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274 }
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275 }
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276 return (pos);
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277 }
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278
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279 /* Function to update the state of a joystick - called as a device poll.
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280 * This function shouldn't update the joystick structure directly,
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281 * but instead should call SDL_PrivateJoystick*() to deliver events
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282 * and update joystick device state.
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283 */
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284 void
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285 SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
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286 {
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287 MMRESULT result;
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288 int i;
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289 DWORD flags[MAX_AXES] = { JOY_RETURNX, JOY_RETURNY, JOY_RETURNZ,
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290 JOY_RETURNR, JOY_RETURNU, JOY_RETURNV
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291 };
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292 DWORD pos[MAX_AXES];
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293 struct _transaxis *transaxis;
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294 int value, change;
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295 JOYINFOEX joyinfo;
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296
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297 joyinfo.dwSize = sizeof(joyinfo);
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298 joyinfo.dwFlags = JOY_RETURNALL | JOY_RETURNPOVCTS;
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299 if (!joystick->hats) {
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300 joyinfo.dwFlags &= ~(JOY_RETURNPOV | JOY_RETURNPOVCTS);
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301 }
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302 result = joyGetPosEx(joystick->hwdata->id, &joyinfo);
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303 if (result != JOYERR_NOERROR) {
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304 SetMMerror("joyGetPosEx", result);
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305 return;
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306 }
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307
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308 /* joystick motion events */
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309 pos[0] = joyinfo.dwXpos;
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310 pos[1] = joyinfo.dwYpos;
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311 pos[2] = joyinfo.dwZpos;
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312 pos[3] = joyinfo.dwRpos;
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313 pos[4] = joyinfo.dwUpos;
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314 pos[5] = joyinfo.dwVpos;
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315
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316 transaxis = joystick->hwdata->transaxis;
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317 for (i = 0; i < joystick->naxes; i++) {
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318 if (joyinfo.dwFlags & flags[i]) {
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319 value =
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320 (int) (((float) pos[i] +
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321 transaxis[i].offset) * transaxis[i].scale);
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322 change = (value - joystick->axes[i]);
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323 if ((change < -JOY_AXIS_THRESHOLD)
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324 || (change > JOY_AXIS_THRESHOLD)) {
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325 SDL_PrivateJoystickAxis(joystick, (Uint8) i, (Sint16) value);
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326 }
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327 }
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328 }
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329
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330 /* joystick button events */
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331 if (joyinfo.dwFlags & JOY_RETURNBUTTONS) {
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332 for (i = 0; i < joystick->nbuttons; ++i) {
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333 if (joyinfo.dwButtons & JOY_BUTTON_FLAG(i)) {
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334 if (!joystick->buttons[i]) {
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335 SDL_PrivateJoystickButton(joystick, (Uint8) i,
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336 SDL_PRESSED);
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337 }
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338 } else {
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339 if (joystick->buttons[i]) {
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340 SDL_PrivateJoystickButton(joystick, (Uint8) i,
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341 SDL_RELEASED);
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342 }
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343 }
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344 }
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345 }
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346
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347 /* joystick hat events */
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348 if (joyinfo.dwFlags & JOY_RETURNPOV) {
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349 Uint8 pos;
0
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350
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351 pos = TranslatePOV(joyinfo.dwPOV);
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352 if (pos != joystick->hats[0]) {
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353 SDL_PrivateJoystickHat(joystick, 0, pos);
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354 }
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diff changeset
355 }
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356 }
74212992fb08 Initial revision
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diff changeset
357
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diff changeset
358 /* Function to close a joystick after use */
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diff changeset
359 void
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diff changeset
360 SDL_SYS_JoystickClose(SDL_Joystick * joystick)
0
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diff changeset
361 {
1895
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diff changeset
362 if (joystick->hwdata != NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
363 /* free system specific hardware data */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
364 SDL_free(joystick->hwdata);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
365 }
0
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diff changeset
366 }
74212992fb08 Initial revision
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parents:
diff changeset
367
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368 /* Function to perform any system-specific joystick related cleanup */
1895
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diff changeset
369 void
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diff changeset
370 SDL_SYS_JoystickQuit(void)
0
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371 {
1895
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diff changeset
372 int i;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
373 for (i = 0; i < MAX_JOYSTICKS; i++) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
374 if (SYS_JoystickName[i] != NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1748
diff changeset
375 SDL_free(SYS_JoystickName[i]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1748
diff changeset
376 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
377 }
0
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parents:
diff changeset
378 }
74212992fb08 Initial revision
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parents:
diff changeset
379
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diff changeset
380
74212992fb08 Initial revision
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diff changeset
381 /* implementation functions */
1895
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diff changeset
382 void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
383 SetMMerror(char *function, int code)
0
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parents:
diff changeset
384 {
1895
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diff changeset
385 static char *error;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
386 static char errbuf[1024];
0
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parents:
diff changeset
387
1895
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
388 errbuf[0] = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
389 switch (code) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
390 case MMSYSERR_NODRIVER:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
391 error = "Joystick driver not present";
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
392 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
393
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
394 case MMSYSERR_INVALPARAM:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
395 case JOYERR_PARMS:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
396 error = "Invalid parameter(s)";
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
397 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
398
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
399 case MMSYSERR_BADDEVICEID:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
400 error = "Bad device ID";
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
401 break;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
402
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
403 case JOYERR_UNPLUGGED:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
404 error = "Joystick not attached";
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
405 break;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
406
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
407 case JOYERR_NOCANDO:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
408 error = "Can't capture joystick input";
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
409 break;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
410
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
411 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
412 SDL_snprintf(errbuf, SDL_arraysize(errbuf),
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
413 "%s: Unknown Multimedia system error: 0x%x",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
414 function, code);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
415 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
416 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
418 if (!errbuf[0]) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
419 SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: %s", function,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
420 error);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
421 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
422 SDL_SetError("%s", errbuf);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 }
1635
92947e3a18db Make sure code is only compiled if the appropriate subsystem is enabled
Sam Lantinga <slouken@libsdl.org>
parents: 1433
diff changeset
424
92947e3a18db Make sure code is only compiled if the appropriate subsystem is enabled
Sam Lantinga <slouken@libsdl.org>
parents: 1433
diff changeset
425 #endif /* SDL_JOYSTICK_WINMM */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1748
diff changeset
426 /* vi: set ts=4 sw=4 expandtab: */