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annotate src/joystick/riscos/SDL_sysjoystick.c @ 1402:d910939febfa

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Use consistent identifiers for the various platforms we support. Make sure every source file includes SDL_config.h, so the proper system headers are chosen.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 21 Feb 2006 08:46:50 +0000
parents 19418e4422cb
children d74ecb53b67a
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 /*
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25 RISC OS - Joystick support by Alan Buckley (alan_baa@hotmail.com) - 10 April 2003
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26
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27 Note: Currently assumes joystick is present if joystick module is loaded
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28 and that there is one joystick with four buttons.
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29 */
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30
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31 /* This is the system specific header for the SDL joystick API */
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32
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33 #include "SDL_joystick.h"
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34 #include "../SDL_sysjoystick.h"
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35 #include "../SDL_joystick_c.h"
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36
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37 #include "kernel.h"
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38
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39 #define JOYSTICK_READ 0x43F40
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40
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41 struct joystick_hwdata
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42 {
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43 int joystate;
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44 };
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45
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46
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47 /* Function to scan the system for joysticks.
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48 * This function should set SDL_numjoysticks to the number of available
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49 * joysticks. Joystick 0 should be the system default joystick.
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50 * It should return number of joysticks, or -1 on an unrecoverable fatal error.
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51 */
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52 int SDL_SYS_JoystickInit(void)
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53 {
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54 _kernel_swi_regs regs;
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55
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56 /* Try to read joystick 0 */
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57 regs.r[0] = 0;
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58 if (_kernel_swi(JOYSTICK_READ, &regs, &regs) == NULL)
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59 {
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60 /* Switch works so assume we've got a joystick */
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61 return 1;
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62 }
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63 /* Switch fails so it looks like there's no joystick here */
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64
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65 return(0);
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66 }
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67
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68 /* Function to get the device-dependent name of a joystick */
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69 const char *SDL_SYS_JoystickName(int index)
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70 {
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71 if (index == 0)
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72 {
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73 return "RISC OS Joystick 0";
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74 }
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75
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76 SDL_SetError("No joystick available with that index");
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77 return(NULL);
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78 }
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79
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80 /* Function to open a joystick for use.
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81 The joystick to open is specified by the index field of the joystick.
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82 This should fill the nbuttons and naxes fields of the joystick structure.
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83 It returns 0, or -1 if there is an error.
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84 */
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85 int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
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86 {
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87 _kernel_swi_regs regs;
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88
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89 if(!(joystick->hwdata=SDL_malloc(sizeof(struct joystick_hwdata))))
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90 return -1;
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91
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92 regs.r[0] = joystick->index;
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93
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94 /* Don't know how to get exact count of buttons so assume max of 4 for now */
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95 joystick->nbuttons=4;
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96
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97 joystick->nhats=0;
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98 joystick->nballs=0;
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99 joystick->naxes=2;
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100 joystick->hwdata->joystate=0;
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101
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102 return 0;
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103
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104 }
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105
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106 /* Function to update the state of a joystick - called as a device poll.
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107 * This function shouldn't update the joystick structure directly,
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108 * but instead should call SDL_PrivateJoystick*() to deliver events
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109 * and update joystick device state.
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110 */
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111 void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
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112 {
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113 _kernel_swi_regs regs;
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114 regs.r[0] = joystick->index;
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115
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116 if (_kernel_swi(JOYSTICK_READ, &regs, &regs) == NULL)
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117 {
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118 int newstate = regs.r[0];
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119 int oldstate = joystick->hwdata->joystate;
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120 if (newstate != oldstate)
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121 {
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122 if ((newstate & 0xFF) != (oldstate & 0xFF))
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123 {
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124 int y = regs.r[0] & 0xFF;
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125 /* Convert to signed values */
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126 if (y >= 128) y -= 256;
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127 SDL_PrivateJoystickAxis(joystick,1,-y * 256); /* Up and down opposite to result in SDL */
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128 }
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129 if ((newstate & 0xFF00) != (oldstate & 0xFF00))
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130 {
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131 int x = (regs.r[0] & 0xFF00) >> 8;
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132 if (x >= 128) x -= 256;
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133 SDL_PrivateJoystickAxis(joystick,0,x * 256);
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134 }
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135
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136 if ((newstate & 0xFF0000) != (oldstate & 0xFF0000))
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137 {
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138 int buttons = (regs.r[0] & 0xFF0000) >> 16;
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139 int oldbuttons = (oldstate & 0xFF0000) >> 16;
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140 int i;
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141 for (i = 0; i < joystick->nbuttons; i++)
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142 {
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143 if ((buttons & (1<<i)) != (oldbuttons & (1<<i)))
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144 {
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145 if (buttons & (1<<i)) SDL_PrivateJoystickButton(joystick,i,SDL_PRESSED);
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146 else SDL_PrivateJoystickButton(joystick,i,SDL_RELEASED);
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147 }
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148 }
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149 }
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150 joystick->hwdata->joystate = newstate;
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151 }
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152 }
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153
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154 return;
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155 }
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156
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157 /* Function to close a joystick after use */
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158 void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
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159 {
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160 if(joystick->hwdata)
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161 SDL_free(joystick->hwdata);
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162 return;
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163 }
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164
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165 /* Function to perform any system-specific joystick related cleanup */
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166 void SDL_SYS_JoystickQuit(void)
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167 {
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168 SDL_numjoysticks=0;
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169
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170 return;
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171 }
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172