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annotate src/joystick/riscos/SDL_sysjoystick.c @ 1673:624e1412fbba SDL-1.3

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Keyboard code update in progress
author Sam Lantinga <slouken@libsdl.org>
date Sat, 10 Jun 2006 09:11:59 +0000
parents 4da1ee79c9af
children
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_RISCOS
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25
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26 /*
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27 RISC OS - Joystick support by Alan Buckley (alan_baa@hotmail.com) - 10 April 2003
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28
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29 Note: Currently assumes joystick is present if joystick module is loaded
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30 and that there is one joystick with four buttons.
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31 */
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32
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33 /* This is the system specific header for the SDL joystick API */
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34
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35 #include "SDL_events.h"
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36 #include "SDL_joystick.h"
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37 #include "../SDL_sysjoystick.h"
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38 #include "../SDL_joystick_c.h"
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39
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40 #include "kernel.h"
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41
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42 #define JOYSTICK_READ 0x43F40
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43
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44 struct joystick_hwdata
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45 {
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46 int joystate;
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47 };
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48
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49
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50 /* Function to scan the system for joysticks.
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51 * This function should set SDL_numjoysticks to the number of available
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52 * joysticks. Joystick 0 should be the system default joystick.
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53 * It should return number of joysticks, or -1 on an unrecoverable fatal error.
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54 */
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55 int
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56 SDL_SYS_JoystickInit(void)
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57 {
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58 _kernel_swi_regs regs;
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59
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60 /* Try to read joystick 0 */
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61 regs.r[0] = 0;
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62 if (_kernel_swi(JOYSTICK_READ, &regs, &regs) == NULL) {
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63 /* Switch works so assume we've got a joystick */
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64 return 1;
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65 }
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66 /* Switch fails so it looks like there's no joystick here */
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67
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68 return (0);
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69 }
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70
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71 /* Function to get the device-dependent name of a joystick */
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72 const char *
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73 SDL_SYS_JoystickName(int index)
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74 {
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75 if (index == 0) {
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76 return "RISC OS Joystick 0";
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77 }
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78
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79 SDL_SetError("No joystick available with that index");
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80 return (NULL);
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81 }
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82
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83 /* Function to open a joystick for use.
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84 The joystick to open is specified by the index field of the joystick.
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85 This should fill the nbuttons and naxes fields of the joystick structure.
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86 It returns 0, or -1 if there is an error.
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87 */
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88 int
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89 SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
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90 {
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91 _kernel_swi_regs regs;
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92
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93 if (!(joystick->hwdata = SDL_malloc(sizeof(struct joystick_hwdata))))
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94 return -1;
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95
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96 regs.r[0] = joystick->index;
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97
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98 /* Don't know how to get exact count of buttons so assume max of 4 for now */
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99 joystick->nbuttons = 4;
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100
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101 joystick->nhats = 0;
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102 joystick->nballs = 0;
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103 joystick->naxes = 2;
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104 joystick->hwdata->joystate = 0;
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105
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106 return 0;
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107
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108 }
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109
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110 /* Function to update the state of a joystick - called as a device poll.
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111 * This function shouldn't update the joystick structure directly,
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112 * but instead should call SDL_PrivateJoystick*() to deliver events
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113 * and update joystick device state.
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114 */
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115 void
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116 SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
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117 {
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118 _kernel_swi_regs regs;
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119 regs.r[0] = joystick->index;
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120
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121 if (_kernel_swi(JOYSTICK_READ, &regs, &regs) == NULL) {
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122 int newstate = regs.r[0];
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123 int oldstate = joystick->hwdata->joystate;
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124 if (newstate != oldstate) {
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125 if ((newstate & 0xFF) != (oldstate & 0xFF)) {
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126 int y = regs.r[0] & 0xFF;
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127 /* Convert to signed values */
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128 if (y >= 128)
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129 y -= 256;
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130 SDL_PrivateJoystickAxis(joystick, 1, -y * 256); /* Up and down opposite to result in SDL */
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131 }
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132 if ((newstate & 0xFF00) != (oldstate & 0xFF00)) {
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133 int x = (regs.r[0] & 0xFF00) >> 8;
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134 if (x >= 128)
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135 x -= 256;
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136 SDL_PrivateJoystickAxis(joystick, 0, x * 256);
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137 }
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138
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139 if ((newstate & 0xFF0000) != (oldstate & 0xFF0000)) {
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140 int buttons = (regs.r[0] & 0xFF0000) >> 16;
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141 int oldbuttons = (oldstate & 0xFF0000) >> 16;
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142 int i;
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143 for (i = 0; i < joystick->nbuttons; i++) {
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144 if ((buttons & (1 << i)) != (oldbuttons & (1 << i))) {
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145 if (buttons & (1 << i))
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146 SDL_PrivateJoystickButton(joystick, i,
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147 SDL_PRESSED);
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148 else
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149 SDL_PrivateJoystickButton(joystick, i,
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150 SDL_RELEASED);
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151 }
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152 }
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153 }
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154 joystick->hwdata->joystate = newstate;
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155 }
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156 }
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157
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158 return;
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159 }
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160
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161 /* Function to close a joystick after use */
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162 void
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163 SDL_SYS_JoystickClose(SDL_Joystick * joystick)
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164 {
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165 if (joystick->hwdata)
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166 SDL_free(joystick->hwdata);
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167 return;
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168 }
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169
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170 /* Function to perform any system-specific joystick related cleanup */
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171 void
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172 SDL_SYS_JoystickQuit(void)
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173 {
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174 SDL_numjoysticks = 0;
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175
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176 return;
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177 }
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178
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179 #endif /* SDL_JOYSTICK_RISCOS */
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180 /* vi: set ts=4 sw=4 expandtab: */