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annotate src/joystick/riscos/SDL_sysjoystick.c @ 1183:634d85aefc8c

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Fixed bug reported here: http://www.devolution.com/pipermail/sdl/2005-October/070998.html --ryan.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 22 Nov 2005 09:59:42 +0000
parents 974ba6ae0fa3
children c9b51268668f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 /*
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24 RISC OS - Joystick support by Alan Buckley (alan_baa@hotmail.com) - 10 April 2003
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25
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26 Note: Currently assumes joystick is present if joystick module is loaded
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27 and that there is one joystick with four buttons.
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28 */
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29
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30 #ifdef SAVE_RCSID
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31 static char rcsid =
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32 "@(#) $Id$";
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33 #endif
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34
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35 /* This is the system specific header for the SDL joystick API */
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36
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37 #include <stdio.h> /* For the definition of NULL */
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38 #include <stdlib.h>
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39
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40 #include "SDL_error.h"
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41 #include "SDL_joystick.h"
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42 #include "SDL_sysjoystick.h"
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43 #include "SDL_joystick_c.h"
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44
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45 #include "kernel.h"
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46
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47 #define JOYSTICK_READ 0x43F40
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48
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49 struct joystick_hwdata
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50 {
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51 int joystate;
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52 };
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53
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54
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55 /* Function to scan the system for joysticks.
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56 * This function should set SDL_numjoysticks to the number of available
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57 * joysticks. Joystick 0 should be the system default joystick.
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58 * It should return number of joysticks, or -1 on an unrecoverable fatal error.
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59 */
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60 int SDL_SYS_JoystickInit(void)
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61 {
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62 _kernel_swi_regs regs;
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63
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64 /* Try to read joystick 0 */
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65 regs.r[0] = 0;
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66 if (_kernel_swi(JOYSTICK_READ, &regs, &regs) == NULL)
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67 {
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68 /* Switch works so assume we've got a joystick */
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69 return 1;
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70 }
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71 /* Switch fails so it looks like there's no joystick here */
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72
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73 return(0);
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74 }
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75
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76 /* Function to get the device-dependent name of a joystick */
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77 const char *SDL_SYS_JoystickName(int index)
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78 {
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79 if (index == 0)
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80 {
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81 return "RISC OS Joystick 0";
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82 }
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83
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84 SDL_SetError("No joystick available with that index");
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85 return(NULL);
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86 }
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87
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88 /* Function to open a joystick for use.
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89 The joystick to open is specified by the index field of the joystick.
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90 This should fill the nbuttons and naxes fields of the joystick structure.
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91 It returns 0, or -1 if there is an error.
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92 */
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93 int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
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94 {
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95 _kernel_swi_regs regs;
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96
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97 if(!(joystick->hwdata=malloc(sizeof(struct joystick_hwdata))))
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98 return -1;
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99
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100 regs.r[0] = joystick->index;
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101
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102 /* Don't know how to get exact count of buttons so assume max of 4 for now */
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103 joystick->nbuttons=4;
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104
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105 joystick->nhats=0;
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106 joystick->nballs=0;
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107 joystick->naxes=2;
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108 joystick->hwdata->joystate=0;
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109
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110 return 0;
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111
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112 }
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113
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114 /* Function to update the state of a joystick - called as a device poll.
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115 * This function shouldn't update the joystick structure directly,
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116 * but instead should call SDL_PrivateJoystick*() to deliver events
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117 * and update joystick device state.
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118 */
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119 void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
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120 {
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121 _kernel_swi_regs regs;
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122 regs.r[0] = joystick->index;
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123
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124 if (_kernel_swi(JOYSTICK_READ, &regs, &regs) == NULL)
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125 {
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126 int newstate = regs.r[0];
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127 int oldstate = joystick->hwdata->joystate;
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128 if (newstate != oldstate)
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129 {
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130 if ((newstate & 0xFF) != (oldstate & 0xFF))
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131 {
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132 int y = regs.r[0] & 0xFF;
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133 /* Convert to signed values */
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134 if (y >= 128) y -= 256;
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135 SDL_PrivateJoystickAxis(joystick,1,-y * 256); /* Up and down opposite to result in SDL */
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136 }
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137 if ((newstate & 0xFF00) != (oldstate & 0xFF00))
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138 {
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139 int x = (regs.r[0] & 0xFF00) >> 8;
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140 if (x >= 128) x -= 256;
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141 SDL_PrivateJoystickAxis(joystick,0,x * 256);
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142 }
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143
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144 if ((newstate & 0xFF0000) != (oldstate & 0xFF0000))
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145 {
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146 int buttons = (regs.r[0] & 0xFF0000) >> 16;
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147 int oldbuttons = (oldstate & 0xFF0000) >> 16;
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148 int i;
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149 for (i = 0; i < joystick->nbuttons; i++)
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150 {
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151 if ((buttons & (1<<i)) != (oldbuttons & (1<<i)))
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152 {
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153 if (buttons & (1<<i)) SDL_PrivateJoystickButton(joystick,i,SDL_PRESSED);
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154 else SDL_PrivateJoystickButton(joystick,i,SDL_RELEASED);
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155 }
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156 }
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157 }
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158 joystick->hwdata->joystate = newstate;
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159 }
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160 }
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161
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162 return;
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163 }
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164
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165 /* Function to close a joystick after use */
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166 void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
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167 {
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168 if(joystick->hwdata)
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169 free(joystick->hwdata);
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170 return;
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171 }
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172
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173 /* Function to perform any system-specific joystick related cleanup */
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174 void SDL_SYS_JoystickQuit(void)
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175 {
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176 SDL_numjoysticks=0;
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177
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178 return;
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179 }
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180