annotate src/joystick/dc/SDL_sysjoystick.c @ 509:dad72daf44b3

Added initial support for Dreamcast (thanks HERO!)
author Sam Lantinga <slouken@libsdl.org>
date Sat, 05 Oct 2002 16:50:56 +0000
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children b8d311d90021
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509
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 BERO
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20 bero@geocities.co.jp
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21
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22 based on win32/SDL_mmjoystick.c
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23
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24 Sam Lantinga
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25 slouken@libsdl.org
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26 */
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27
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28 #ifdef SAVE_RCSID
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29 static char rcsid =
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30 "@(#) $Id$";
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31 #endif
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32
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33 /* Win32 MultiMedia Joystick driver, contributed by Andrei de A. Formiga */
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34
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35 #include <stdlib.h>
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36 #include <stdio.h> /* For the definition of NULL */
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37
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38 #include "SDL_error.h"
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39 #include "SDL_joystick.h"
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40 #include "SDL_sysjoystick.h"
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41 #include "SDL_joystick_c.h"
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42
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43 #include <dc/maple.h>
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44 #include <dc/maple/controller.h>
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45
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46 #define MAX_JOYSTICKS 8 /* only 2 are supported in the multimedia API */
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47 #define MAX_AXES 6 /* each joystick can have up to 6 axes */
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48 #define MAX_BUTTONS 8 /* and 8 buttons */
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49 #define MAX_HATS 2
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50
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51 #define JOYNAMELEN 8
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52
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53 /* array to hold joystick ID values */
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54 static uint8 SYS_Joystick_addr[MAX_JOYSTICKS];
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55
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56 /* The private structure used to keep track of a joystick */
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57 struct joystick_hwdata
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58 {
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59 cont_cond_t prev_cond;
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60 int prev_buttons;
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61 };
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62
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63 /* Function to scan the system for joysticks.
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64 * This function should set SDL_numjoysticks to the number of available
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65 * joysticks. Joystick 0 should be the system default joystick.
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66 * It should return 0, or -1 on an unrecoverable fatal error.
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67 */
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68 int SDL_SYS_JoystickInit(void)
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69 {
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70 int numdevs;
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71
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72 int p,u;
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73
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74 numdevs = 0;
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75 for(p=0;p<MAPLE_PORT_COUNT;p++) {
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76 for(u=0;u<MAPLE_UNIT_COUNT;u++) {
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77 if (maple_device_func(p,u)&MAPLE_FUNC_CONTROLLER) {
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78 SYS_Joystick_addr[numdevs] = maple_addr(p,u);
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79 numdevs++;
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80 }
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81 }
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82 }
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83
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84 return(numdevs);
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85 }
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86
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87 /* Function to get the device-dependent name of a joystick */
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88 const char *SDL_SYS_JoystickName(int index)
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89 {
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90 maple_device_t *dev;
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91 if (maple_compat_resolve(SYS_Joystick_addr[index],&dev,MAPLE_FUNC_CONTROLLER)!=0) return NULL;
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92 return dev->info.product_name;
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93 }
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94
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95 /* Function to open a joystick for use.
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96 The joystick to open is specified by the index field of the joystick.
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97 This should fill the nbuttons and naxes fields of the joystick structure.
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98 It returns 0, or -1 if there is an error.
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99 */
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100 int SDL_SYS_JoystickOpen(SDL_Joystick *joystick)
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101 {
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102 /* allocate memory for system specific hardware data */
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103 joystick->hwdata = (struct joystick_hwdata *) malloc(sizeof(*joystick->hwdata));
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104 if (joystick->hwdata == NULL)
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105 {
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106 SDL_OutOfMemory();
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107 return(-1);
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108 }
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109 memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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110
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111 /* fill nbuttons, naxes, and nhats fields */
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112 joystick->nbuttons = MAX_BUTTONS;
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113 joystick->naxes = MAX_AXES;
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114 joystick->nhats = MAX_HATS;
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115 return(0);
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116 }
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117
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118
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119 /* Function to update the state of a joystick - called as a device poll.
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120 * This function shouldn't update the joystick structure directly,
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121 * but instead should call SDL_PrivateJoystick*() to deliver events
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122 * and update joystick device state.
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123 */
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124
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125 void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
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126 {
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127 const int sdl_buttons[] = {
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128 CONT_C,
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129 CONT_B,
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130 CONT_A,
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131 CONT_START,
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132 CONT_Z,
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133 CONT_Y,
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134 CONT_X,
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135 CONT_D
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136 };
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137
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138 uint8 addr;
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139 cont_cond_t cond,*prev_cond;
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140 int buttons,prev_buttons,i,changed;
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141
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142 addr = SYS_Joystick_addr[joystick->index];
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143 if (cont_get_cond(addr,&cond)<0) return;
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144
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145 buttons = cond.buttons;
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146 prev_buttons = joystick->hwdata->prev_buttons;
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147 changed = buttons^prev_buttons;
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148
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149 if ((changed)&(CONT_DPAD_UP|CONT_DPAD_DOWN|CONT_DPAD_LEFT|CONT_DPAD_RIGHT)) {
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150 int hat = SDL_HAT_CENTERED;
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151 if (buttons&CONT_DPAD_UP) hat|=SDL_HAT_UP;
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152 if (buttons&CONT_DPAD_DOWN) hat|=SDL_HAT_DOWN;
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153 if (buttons&CONT_DPAD_LEFT) hat|=SDL_HAT_LEFT;
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154 if (buttons&CONT_DPAD_RIGHT) hat|=SDL_HAT_RIGHT;
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155 SDL_PrivateJoystickHat(joystick, 0, hat);
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156 }
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157 if ((changed)&(CONT_DPAD2_UP|CONT_DPAD2_DOWN|CONT_DPAD2_LEFT|CONT_DPAD2_RIGHT)) {
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158 int hat = SDL_HAT_CENTERED;
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159 if (buttons&CONT_DPAD2_UP) hat|=SDL_HAT_UP;
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160 if (buttons&CONT_DPAD2_DOWN) hat|=SDL_HAT_DOWN;
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161 if (buttons&CONT_DPAD2_LEFT) hat|=SDL_HAT_LEFT;
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162 if (buttons&CONT_DPAD2_RIGHT) hat|=SDL_HAT_RIGHT;
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163 SDL_PrivateJoystickHat(joystick, 1, hat);
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164 }
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165
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166 for(i=0;i<sizeof(sdl_buttons)/sizeof(sdl_buttons[0]);i++) {
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167 if (changed & sdl_buttons[i]) {
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168 SDL_PrivateJoystickButton(joystick, i, (buttons & sdl_buttons[i])?SDL_PRESSED:SDL_RELEASED);
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169 }
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170 }
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171
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172 prev_cond = &joystick->hwdata->prev_cond;
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173 if (cond.joyx!=prev_cond->joyx)
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174 SDL_PrivateJoystickAxis(joystick, 0, cond.joyx-128);
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175 if (cond.joyy!=prev_cond->joyy)
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176 SDL_PrivateJoystickAxis(joystick, 1, cond.joyy-128);
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177 if (cond.rtrig!=prev_cond->rtrig)
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178 SDL_PrivateJoystickAxis(joystick, 2, cond.rtrig);
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179 if (cond.ltrig!=prev_cond->ltrig)
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180 SDL_PrivateJoystickAxis(joystick, 3, cond.ltrig);
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181 if (cond.joy2x!=prev_cond->joy2x)
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182 SDL_PrivateJoystickAxis(joystick, 4, cond.joy2x-128);
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183 if (cond.joy2y!=prev_cond->joy2y)
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184 SDL_PrivateJoystickAxis(joystick, 5, cond.joy2y-128);
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185
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186 joystick->hwdata->prev_buttons = buttons;
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187 joystick->hwdata->prev_cond = cond;
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188 }
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189
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190 /* Function to close a joystick after use */
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191 void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
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192 {
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193 if (joystick->hwdata != NULL) {
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194 /* free system specific hardware data */
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195 free(joystick->hwdata);
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196 }
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197 }
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198
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199 /* Function to perform any system-specific joystick related cleanup */
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200 void SDL_SYS_JoystickQuit(void)
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201 {
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202 return;
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203 }