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annotate src/joystick/riscos/SDL_sysjoystick.c @ 1302:94643e9bad18

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Date: Sat, 14 Jan 2006 15:16:01 -0500 From: Andrew Fuller Subject: [SDL] [PATCH] ML-8866 PS2->USB converter This converter seems to go by several names -- Super Dual Box, Dual USB Joypad, and who knows what else. Also branded differently with different colour cases, etc. But it seems to all be the same internals. It is a common converter used for StepMania, with several posts Googleable trying to make it work in Linux. I got mine yesterday and wanted to play stepmania, so I went ahead and made a crude patch for libsdl to split this baby into two logical joysticks. A couple notes about the patch: This patch works well for two dance mats hooked up and playing stepmania, however the mapping of the other buttons may be off. I have no joystick which uses all the buttons the converter reports, so I have no way of testing them. The name I used 0925:8866 which is the USB ID, and what SDLjoytest-GL reported is the name, even though lsusb shows Wisegroup, Ltd MP-8866 Dual USB Joypad, and the existing virtual joystick mapping uses the Wisegroup... name. Not sure why the discrepency. I'm not subscribed to this mailing list, so please CC me on any comments to this. -Andrew
author Sam Lantinga <slouken@libsdl.org>
date Tue, 31 Jan 2006 14:59:43 +0000
parents 974ba6ae0fa3
children c9b51268668f
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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