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annotate src/joystick/riscos/SDL_sysjoystick.c @ 1258:b2283b0ded26

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Date: Thu, 19 Jan 2006 20:02:29 +0200 From: Vassilis Virvilis <vasvir@iit.demokritos.gr> Subject: [SDL] Request: Please reconsider adding tag in SDL_Event Hi, Patch in question: --- include/SDL_events.h 20 Aug 2004 18:57:01 -0000 1.11 +++ include/SDL_events.h 19 Jan 2006 17:35:09 -0000 @@ -214,7 +214,7 @@ } SDL_SysWMEvent; /* General event structure */ -typedef union { +typedef union SDL_Event { Uint8 type; SDL_ActiveEvent active; SDL_KeyboardEvent key; Reasoning: ---------- 1) Allows forward declaration of the SDL_Event union in C++. Please note that in plain C it is possible to forward declare it. 2) Forward declaration is good because it allows encapsulation. It hides the specific implementation and does not necessarily exposes SDL staff to my appication's namespace 3) It can't harm plain C because tags are living in a different namespace than typenames 4) It is already done like this in other places in SDL. Check for example SDL_KeySym, and SDL_.*Event structures. 5) Right now I have to include SDL/event.h from a C++ header file. See 2)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 20 Jan 2006 13:07:25 +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