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annotate src/joystick/macos/SDL_sysjoystick.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_MACOS
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25
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26 /* SDL stuff -- "SDL_sysjoystick.c"
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27 MacOS joystick functions by Frederick Reitberger
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28
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29 The code that follows is meant for SDL. Use at your own risk.
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30 */
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31
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32 #include <InputSprocket.h>
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33
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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
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39 /* The max number of joysticks we will detect */
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40 #define MAX_JOYSTICKS 16
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41 /* Limit ourselves to 32 elements per device */
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42 #define kMaxReferences 32
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43
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44 #define ISpSymmetricAxisToFloat(axis) ((((float) axis) - kISpAxisMiddle) / (kISpAxisMaximum-kISpAxisMiddle))
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45 #define ISpAsymmetricAxisToFloat(axis) (((float) axis) / (kISpAxisMaximum))
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46
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47
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48 static ISpDeviceReference SYS_Joysticks[MAX_JOYSTICKS];
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49 static ISpElementListReference SYS_Elements[MAX_JOYSTICKS];
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50 static ISpDeviceDefinition SYS_DevDef[MAX_JOYSTICKS];
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51
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52 struct joystick_hwdata
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53 {
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54 char name[64];
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55 /* Uint8 id;*/
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56 ISpElementReference refs[kMaxReferences];
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57 /* gonna need some sort of mapping info */
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58 };
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59
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60
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61 /* Function to scan the system for joysticks.
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62 * Joystick 0 should be the system default joystick.
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63 * This function should return the number of available joysticks, or -1
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64 * on an unrecoverable fatal error.
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65 */
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66 int
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67 SDL_SYS_JoystickInit(void)
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68 {
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69 static ISpDeviceClass classes[4] = {
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70 kISpDeviceClass_Joystick,
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71 #if kISpDeviceClass_Gamepad
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72 kISpDeviceClass_Gamepad,
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73 #endif
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74 kISpDeviceClass_Wheel,
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75 0
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76 };
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77 OSErr err;
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78 int i;
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79 UInt32 count, numJoysticks;
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80
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81 if ((Ptr) 0 == (Ptr) ISpStartup) {
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82 SDL_SetError("InputSprocket not installed");
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83 return -1; // InputSprocket not installed
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84 }
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85
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86 if ((Ptr) 0 == (Ptr) ISpGetVersion) {
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87 SDL_SetError("InputSprocket not version 1.1 or newer");
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88 return -1; // old version of ISp (not at least 1.1)
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89 }
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90
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91 ISpStartup();
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92
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93 /* Get all the joysticks */
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94 numJoysticks = 0;
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95 for (i = 0; classes[i]; ++i) {
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96 count = 0;
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97 err = ISpDevices_ExtractByClass(classes[i],
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98 MAX_JOYSTICKS - numJoysticks,
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99 &count, &SYS_Joysticks[numJoysticks]);
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100 numJoysticks += count;
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101 }
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102
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103 for (i = 0; i < numJoysticks; i++) {
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104 ISpDevice_GetDefinition(SYS_Joysticks[i],
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105 sizeof(ISpDeviceDefinition), &SYS_DevDef[i]);
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106
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107 err = ISpElementList_New(0, NULL, &SYS_Elements[i], 0);
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108
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109 if (err) {
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110 SDL_OutOfMemory();
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111 return -1;
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112 }
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113
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114 ISpDevice_GetElementList(SYS_Joysticks[i], &SYS_Elements[i]);
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115 }
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116
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117 ISpDevices_Deactivate(numJoysticks, SYS_Joysticks);
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118
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119 return numJoysticks;
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120 }
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121
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122 /* Function to get the device-dependent name of a joystick */
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123 const char *
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124 SDL_SYS_JoystickName(int index)
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125 {
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126 static char name[64];
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127 int len;
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128
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129 /* convert pascal string to c-string */
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130 len = SYS_DevDef[index].deviceName[0];
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131 if (len >= sizeof(name)) {
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132 len = (sizeof(name) - 1);
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133 }
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134 SDL_memcpy(name, &SYS_DevDef[index].deviceName[1], len);
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135 name[len] = '\0';
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136
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137 return name;
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138 }
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139
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140 /* Function to open a joystick for use.
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141 The joystick to open is specified by the index field of the joystick.
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142 This should fill the nbuttons and naxes fields of the joystick structure.
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143 It returns 0, or -1 if there is an error.
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144 */
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145 int
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146 SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
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147 {
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148 int index;
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149 UInt32 count, gotCount, count2;
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150 long numAxis, numButtons, numHats, numBalls;
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151
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152 count = kMaxReferences;
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153 count2 = 0;
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154 numAxis = numButtons = numHats = numBalls = 0;
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155
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156 index = joystick->index;
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157
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158 /* allocate memory for system specific hardware data */
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159 joystick->hwdata =
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160 (struct joystick_hwdata *) SDL_malloc(sizeof(*joystick->hwdata));
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161 if (joystick->hwdata == NULL) {
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162 SDL_OutOfMemory();
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163 return (-1);
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164 }
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165 SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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166 SDL_strlcpy(joystick->hwdata->name, SDL_SYS_JoystickName(index),
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167 SDL_arraysize(joystick->hwdata->name));
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168 joystick->name = joystick->hwdata->name;
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169
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170 ISpElementList_ExtractByKind(SYS_Elements[index],
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171 kISpElementKind_Axis,
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172 count, &gotCount, joystick->hwdata->refs);
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173
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174 numAxis = gotCount;
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175 count -= gotCount;
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176 count2 += gotCount;
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177
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178 ISpElementList_ExtractByKind(SYS_Elements[index],
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179 kISpElementKind_DPad,
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180 count,
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181 &gotCount,
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182 &(joystick->hwdata->refs[count2]));
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183
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184 numHats = gotCount;
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185 count -= gotCount;
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186 count2 += gotCount;
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187
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188 ISpElementList_ExtractByKind(SYS_Elements[index],
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189 kISpElementKind_Button,
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190 count,
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191 &gotCount,
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192 &(joystick->hwdata->refs[count2]));
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193
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194 numButtons = gotCount;
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195 count -= gotCount;
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196 count2 += gotCount;
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197
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198 joystick->naxes = numAxis;
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199 joystick->nhats = numHats;
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200 joystick->nballs = numBalls;
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201 joystick->nbuttons = numButtons;
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202
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203 ISpDevices_Activate(1, &SYS_Joysticks[index]);
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204
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205 return 0;
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206 }
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207
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208 /* Function to update the state of a joystick - called as a device poll.
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209 * This function shouldn't update the joystick structure directly,
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210 * but instead should call SDL_PrivateJoystick*() to deliver events
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211 * and update joystick device state.
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212 */
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213 void
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214 SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
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215 {
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216 int i, j;
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217 ISpAxisData a;
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218 ISpDPadData b;
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219 //ISpDeltaData c;
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220 ISpButtonData d;
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221
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222 for (i = 0, j = 0; i < joystick->naxes; i++, j++) {
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223 Sint16 value;
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224
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225 ISpElement_GetSimpleState(joystick->hwdata->refs[j], &a);
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226 value = (ISpSymmetricAxisToFloat(a) * 32767.0);
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227 if (value != joystick->axes[i]) {
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228 SDL_PrivateJoystickAxis(joystick, i, value);
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229 }
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230 }
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231
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232 for (i = 0; i < joystick->nhats; i++, j++) {
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233 Uint8 pos;
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234
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235 ISpElement_GetSimpleState(joystick->hwdata->refs[j], &b);
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236 switch (b) {
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237 case kISpPadIdle:
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238 pos = SDL_HAT_CENTERED;
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239 break;
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240 case kISpPadLeft:
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241 pos = SDL_HAT_LEFT;
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242 break;
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243 case kISpPadUpLeft:
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244 pos = SDL_HAT_LEFTUP;
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245 break;
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246 case kISpPadUp:
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247 pos = SDL_HAT_UP;
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248 break;
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249 case kISpPadUpRight:
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250 pos = SDL_HAT_RIGHTUP;
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251 break;
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252 case kISpPadRight:
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253 pos = SDL_HAT_RIGHT;
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254 break;
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255 case kISpPadDownRight:
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256 pos = SDL_HAT_RIGHTDOWN;
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257 break;
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258 case kISpPadDown:
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259 pos = SDL_HAT_DOWN;
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260 break;
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261 case kISpPadDownLeft:
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262 pos = SDL_HAT_LEFTDOWN;
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263 break;
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264 }
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265 if (pos != joystick->hats[i]) {
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266 SDL_PrivateJoystickHat(joystick, i, pos);
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267 }
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268 }
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269
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270 for (i = 0; i < joystick->nballs; i++, j++) {
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271 /* ignore balls right now */
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272 }
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273
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274 for (i = 0; i < joystick->nbuttons; i++, j++) {
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275 ISpElement_GetSimpleState(joystick->hwdata->refs[j], &d);
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276 if (d != joystick->buttons[i]) {
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277 SDL_PrivateJoystickButton(joystick, i, d);
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278 }
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279 }
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280 }
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281
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282 /* Function to close a joystick after use */
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283 void
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284 SDL_SYS_JoystickClose(SDL_Joystick * joystick)
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285 {
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286 int index;
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287
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288 index = joystick->index;
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289
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290 ISpDevices_Deactivate(1, &SYS_Joysticks[index]);
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291 }
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292
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293 /* Function to perform any system-specific joystick related cleanup */
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294 void
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295 SDL_SYS_JoystickQuit(void)
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296 {
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297 ISpShutdown();
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298 }
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299
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300 #endif /* SDL_JOYSTICK_MACOS */
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301 /* vi: set ts=4 sw=4 expandtab: */