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0
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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 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 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* This is the joystick API for Simple DirectMedia Layer */
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <string.h>
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33
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34 #include "SDL_error.h"
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35 #include "SDL_events.h"
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36 #ifndef DISABLE_EVENTS
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37 #include "SDL_events_c.h"
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38 #endif
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39 #include "SDL_joystick_c.h"
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40 #include "SDL_sysjoystick.h"
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41
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42 /* This is used for Quake III Arena */
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43 #ifdef DISABLE_EVENTS
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44 #define SDL_Lock_EventThread()
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45 #define SDL_Unlock_EventThread()
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46 #endif
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47
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48 Uint8 SDL_numjoysticks = 0;
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49 SDL_Joystick **SDL_joysticks = NULL;
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50 static SDL_Joystick *default_joystick = NULL;
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51
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52 int SDL_JoystickInit(void)
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53 {
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54 int arraylen;
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55 int status;
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56
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57 SDL_numjoysticks = 0;
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58 status = SDL_SYS_JoystickInit();
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59 if ( status >= 0 ) {
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60 arraylen = (status+1)*sizeof(*SDL_joysticks);
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61 SDL_joysticks = (SDL_Joystick **)malloc(arraylen);
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62 if ( SDL_joysticks == NULL ) {
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63 SDL_numjoysticks = 0;
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64 } else {
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65 memset(SDL_joysticks, 0, arraylen);
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66 }
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67 SDL_numjoysticks = status;
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68 status = 0;
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69 }
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70 default_joystick = NULL;
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71 return(status);
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72 }
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73
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74 /*
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75 * Count the number of joysticks attached to the system
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76 */
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77 int SDL_NumJoysticks(void)
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78 {
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79 return SDL_numjoysticks;
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80 }
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81
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82 /*
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83 * Get the implementation dependent name of a joystick
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84 */
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85 const char *SDL_JoystickName(int device_index)
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86 {
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87 if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) {
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88 SDL_SetError("There are %d joysticks available",
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89 SDL_numjoysticks);
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90 return(NULL);
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91 }
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92 return(SDL_SYS_JoystickName(device_index));
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93 }
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94
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95 /*
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96 * Open a joystick for use - the index passed as an argument refers to
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97 * the N'th joystick on the system. This index is the value which will
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98 * identify this joystick in future joystick events.
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99 *
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100 * This function returns a joystick identifier, or NULL if an error occurred.
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101 */
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102 SDL_Joystick *SDL_JoystickOpen(int device_index)
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103 {
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104 int i;
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105 SDL_Joystick *joystick;
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106
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107 if ( (device_index < 0) || (device_index >= SDL_numjoysticks) ) {
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108 SDL_SetError("There are %d joysticks available",
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109 SDL_numjoysticks);
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110 return(NULL);
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111 }
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112
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113 /* If the joystick is already open, return it */
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114 for ( i=0; SDL_joysticks[i]; ++i ) {
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115 if ( device_index == SDL_joysticks[i]->index ) {
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116 joystick = SDL_joysticks[i];
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117 ++joystick->ref_count;
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118 return(joystick);
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119 }
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120 }
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121
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122 /* Create and initialize the joystick */
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123 joystick = (SDL_Joystick *)malloc((sizeof *joystick));
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124 if ( joystick != NULL ) {
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125 memset(joystick, 0, (sizeof *joystick));
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126 joystick->index = device_index;
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127 if ( SDL_SYS_JoystickOpen(joystick) < 0 ) {
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128 free(joystick);
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129 joystick = NULL;
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130 } else {
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131 if ( joystick->naxes > 0 ) {
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132 joystick->axes = (Sint16 *)malloc
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133 (joystick->naxes*sizeof(Sint16));
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134 }
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135 if ( joystick->nhats > 0 ) {
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136 joystick->hats = (Uint8 *)malloc
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137 (joystick->nhats*sizeof(Uint8));
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138 }
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139 if ( joystick->nballs > 0 ) {
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140 joystick->balls = (struct balldelta *)malloc
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141 (joystick->nballs*sizeof(*joystick->balls));
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142 }
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143 if ( joystick->nbuttons > 0 ) {
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144 joystick->buttons = (Uint8 *)malloc
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145 (joystick->nbuttons*sizeof(Uint8));
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146 }
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147 if ( ((joystick->naxes > 0) && !joystick->axes)
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148 || ((joystick->nhats > 0) && !joystick->hats)
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149 || ((joystick->nballs > 0) && !joystick->balls)
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150 || ((joystick->nbuttons > 0) && !joystick->buttons)) {
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151 SDL_OutOfMemory();
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152 SDL_JoystickClose(joystick);
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153 joystick = NULL;
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154 }
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155 if ( joystick->axes ) {
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156 memset(joystick->axes, 0,
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157 joystick->naxes*sizeof(Sint16));
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158 }
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159 if ( joystick->hats ) {
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160 memset(joystick->hats, 0,
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161 joystick->nhats*sizeof(Uint8));
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162 }
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163 if ( joystick->balls ) {
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164 memset(joystick->balls, 0,
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165 joystick->nballs*sizeof(*joystick->balls));
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166 }
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167 if ( joystick->buttons ) {
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168 memset(joystick->buttons, 0,
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169 joystick->nbuttons*sizeof(Uint8));
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170 }
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171 }
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172 }
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173 if ( joystick ) {
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174 /* Add joystick to list */
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175 ++joystick->ref_count;
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176 SDL_Lock_EventThread();
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177 for ( i=0; SDL_joysticks[i]; ++i )
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178 /* Skip to next joystick */;
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179 SDL_joysticks[i] = joystick;
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180 SDL_Unlock_EventThread();
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181 }
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182 return(joystick);
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183 }
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184
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185 /*
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186 * Returns 1 if the joystick has been opened, or 0 if it has not.
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187 */
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188 int SDL_JoystickOpened(int device_index)
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189 {
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190 int i, opened;
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191
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192 opened = 0;
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193 for ( i=0; SDL_joysticks[i]; ++i ) {
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194 if ( SDL_joysticks[i]->index == (Uint8)device_index ) {
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195 opened = 1;
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196 break;
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197 }
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198 }
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199 return(opened);
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200 }
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201
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202 static int ValidJoystick(SDL_Joystick **joystick)
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203 {
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204 int valid;
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205
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206 if ( *joystick == NULL ) {
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207 *joystick = default_joystick;
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208 }
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209 if ( *joystick == NULL ) {
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210 SDL_SetError("Joystick hasn't been opened yet");
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211 valid = 0;
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212 } else {
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213 valid = 1;
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214 }
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215 return valid;
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216 }
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217
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218 /*
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219 * Get the device index of an opened joystick.
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220 */
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221 int SDL_JoystickIndex(SDL_Joystick *joystick)
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222 {
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223 if ( ! ValidJoystick(&joystick) ) {
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224 return(-1);
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225 }
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226 return(joystick->index);
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227 }
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228
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229 /*
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230 * Get the number of multi-dimensional axis controls on a joystick
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231 */
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232 int SDL_JoystickNumAxes(SDL_Joystick *joystick)
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233 {
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234 if ( ! ValidJoystick(&joystick) ) {
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235 return(-1);
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236 }
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237 return(joystick->naxes);
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238 }
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239
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240 /*
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241 * Get the number of hats on a joystick
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242 */
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243 int SDL_JoystickNumHats(SDL_Joystick *joystick)
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244 {
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245 if ( ! ValidJoystick(&joystick) ) {
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246 return(-1);
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247 }
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248 return(joystick->nhats);
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249 }
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250
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251 /*
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252 * Get the number of trackballs on a joystick
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253 */
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254 int SDL_JoystickNumBalls(SDL_Joystick *joystick)
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255 {
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256 if ( ! ValidJoystick(&joystick) ) {
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257 return(-1);
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258 }
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259 return(joystick->nballs);
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260 }
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261
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262 /*
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263 * Get the number of buttons on a joystick
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264 */
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265 int SDL_JoystickNumButtons(SDL_Joystick *joystick)
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266 {
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267 if ( ! ValidJoystick(&joystick) ) {
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268 return(-1);
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269 }
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270 return(joystick->nbuttons);
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271 }
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272
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273 /*
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274 * Get the current state of an axis control on a joystick
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275 */
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276 Sint16 SDL_JoystickGetAxis(SDL_Joystick *joystick, int axis)
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277 {
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278 Sint16 state;
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279
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280 if ( ! ValidJoystick(&joystick) ) {
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281 return(0);
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282 }
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283 if ( axis < joystick->naxes ) {
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284 state = joystick->axes[axis];
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285 } else {
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286 SDL_SetError("Joystick only has %d axes", joystick->naxes);
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287 state = 0;
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288 }
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289 return(state);
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290 }
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291
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292 /*
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293 * Get the current state of a hat on a joystick
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294 */
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295 Uint8 SDL_JoystickGetHat(SDL_Joystick *joystick, int hat)
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296 {
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297 Uint8 state;
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298
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299 if ( ! ValidJoystick(&joystick) ) {
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300 return(0);
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301 }
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302 if ( hat < joystick->nhats ) {
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303 state = joystick->hats[hat];
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304 } else {
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305 SDL_SetError("Joystick only has %d hats", joystick->nhats);
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306 state = 0;
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307 }
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308 return(state);
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309 }
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310
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311 /*
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312 * Get the ball axis change since the last poll
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313 */
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314 int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy)
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315 {
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316 int retval;
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317
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318 if ( ! ValidJoystick(&joystick) ) {
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319 return(-1);
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320 }
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321
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322 retval = 0;
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323 if ( ball < joystick->nballs ) {
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324 if ( dx ) {
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325 *dx = joystick->balls[ball].dx;
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326 }
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327 if ( dy ) {
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328 *dy = joystick->balls[ball].dy;
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329 }
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330 joystick->balls[ball].dx = 0;
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331 joystick->balls[ball].dy = 0;
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332 } else {
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333 SDL_SetError("Joystick only has %d balls", joystick->nballs);
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334 retval = -1;
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335 }
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336 return(retval);
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337 }
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338
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339 /*
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340 * Get the current state of a button on a joystick
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341 */
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342 Uint8 SDL_JoystickGetButton(SDL_Joystick *joystick, int button)
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343 {
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344 Uint8 state;
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345
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346 if ( ! ValidJoystick(&joystick) ) {
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347 return(0);
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348 }
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349 if ( button < joystick->nbuttons ) {
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350 state = joystick->buttons[button];
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351 } else {
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352 SDL_SetError("Joystick only has %d buttons",joystick->nbuttons);
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353 state = 0;
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354 }
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355 return(state);
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356 }
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357
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358 /*
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359 * Close a joystick previously opened with SDL_JoystickOpen()
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360 */
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361 void SDL_JoystickClose(SDL_Joystick *joystick)
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362 {
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363 int i;
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364
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365 if ( ! ValidJoystick(&joystick) ) {
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366 return;
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367 }
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368
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369 /* First decrement ref count */
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370 if ( --joystick->ref_count > 0 ) {
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371 return;
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372 }
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373
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374 /* Lock the event queue - prevent joystick polling */
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375 SDL_Lock_EventThread();
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376
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377 if ( joystick == default_joystick ) {
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378 default_joystick = NULL;
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379 }
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380 SDL_SYS_JoystickClose(joystick);
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381
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382 /* Remove joystick from list */
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383 for ( i=0; SDL_joysticks[i]; ++i ) {
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384 if ( joystick == SDL_joysticks[i] ) {
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385 memcpy(&SDL_joysticks[i], &SDL_joysticks[i+1],
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386 (SDL_numjoysticks-i)*sizeof(joystick));
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387 break;
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388 }
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389 }
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390
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391 /* Let the event thread keep running */
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392 SDL_Unlock_EventThread();
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393
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394 /* Free the data associated with this joystick */
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395 if ( joystick->axes ) {
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396 free(joystick->axes);
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397 }
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398 if ( joystick->hats ) {
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399 free(joystick->hats);
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400 }
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401 if ( joystick->balls ) {
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402 free(joystick->balls);
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403 }
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404 if ( joystick->buttons ) {
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405 free(joystick->buttons);
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406 }
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407 free(joystick);
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408 }
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409
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410 void SDL_JoystickQuit(void)
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411 {
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412 /* Stop the event polling */
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413 SDL_Lock_EventThread();
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414 SDL_numjoysticks = 0;
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415 SDL_Unlock_EventThread();
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416
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417 /* Quit the joystick setup */
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418 SDL_SYS_JoystickQuit();
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419 if ( SDL_joysticks ) {
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420 free(SDL_joysticks);
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421 SDL_joysticks = NULL;
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422 }
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423 }
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424
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425
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426 /* These are global for SDL_sysjoystick.c and SDL_events.c */
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427
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428 int SDL_PrivateJoystickAxis(SDL_Joystick *joystick, Uint8 axis, Sint16 value)
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429 {
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430 int posted;
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431
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432 /* Update internal joystick state */
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433 joystick->axes[axis] = value;
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434
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435 /* Post the event, if desired */
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436 posted = 0;
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437 #ifndef DISABLE_EVENTS
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438 if ( SDL_ProcessEvents[SDL_JOYAXISMOTION] == SDL_ENABLE ) {
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439 SDL_Event event;
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440 event.type = SDL_JOYAXISMOTION;
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441 event.jaxis.which = joystick->index;
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442 event.jaxis.axis = axis;
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443 event.jaxis.value = value;
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444 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
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445 posted = 1;
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446 SDL_PushEvent(&event);
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447 }
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448 }
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449 #endif /* !DISABLE_EVENTS */
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450 return(posted);
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|
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451 }
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452
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453 int SDL_PrivateJoystickHat(SDL_Joystick *joystick, Uint8 hat, Uint8 value)
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454 {
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455 int posted;
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456
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457 /* Update internal joystick state */
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458 joystick->hats[hat] = value;
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459
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460 /* Post the event, if desired */
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461 posted = 0;
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462 #ifndef DISABLE_EVENTS
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463 if ( SDL_ProcessEvents[SDL_JOYHATMOTION] == SDL_ENABLE ) {
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464 SDL_Event event;
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465 event.jhat.type = SDL_JOYHATMOTION;
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466 event.jhat.which = joystick->index;
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467 event.jhat.hat = hat;
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468 event.jhat.value = value;
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|
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469 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
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470 posted = 1;
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471 SDL_PushEvent(&event);
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472 }
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473 }
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|
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474 #endif /* !DISABLE_EVENTS */
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|
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475 return(posted);
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|
|
476 }
|
|
|
477
|
|
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478 int SDL_PrivateJoystickBall(SDL_Joystick *joystick, Uint8 ball,
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479 Sint16 xrel, Sint16 yrel)
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|
|
480 {
|
|
|
481 int posted;
|
|
|
482
|
|
|
483 /* Update internal mouse state */
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|
|
484 joystick->balls[ball].dx += xrel;
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|
|
485 joystick->balls[ball].dy += yrel;
|
|
|
486
|
|
|
487 /* Post the event, if desired */
|
|
|
488 posted = 0;
|
|
|
489 #ifndef DISABLE_EVENTS
|
|
|
490 if ( SDL_ProcessEvents[SDL_JOYBALLMOTION] == SDL_ENABLE ) {
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|
|
491 SDL_Event event;
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|
|
492 event.jball.type = SDL_JOYBALLMOTION;
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|
|
493 event.jball.which = joystick->index;
|
|
|
494 event.jball.ball = ball;
|
|
|
495 event.jball.xrel = xrel;
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|
|
496 event.jball.yrel = yrel;
|
|
|
497 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
|
|
|
498 posted = 1;
|
|
|
499 SDL_PushEvent(&event);
|
|
|
500 }
|
|
|
501 }
|
|
|
502 #endif /* !DISABLE_EVENTS */
|
|
|
503 return(posted);
|
|
|
504 }
|
|
|
505
|
|
|
506 int SDL_PrivateJoystickButton(SDL_Joystick *joystick, Uint8 button, Uint8 state)
|
|
|
507 {
|
|
|
508 int posted;
|
|
|
509 #ifndef DISABLE_EVENTS
|
|
|
510 SDL_Event event;
|
|
|
511
|
|
|
512 switch ( state ) {
|
|
|
513 case SDL_PRESSED:
|
|
|
514 event.type = SDL_JOYBUTTONDOWN;
|
|
|
515 break;
|
|
|
516 case SDL_RELEASED:
|
|
|
517 event.type = SDL_JOYBUTTONUP;
|
|
|
518 break;
|
|
|
519 default:
|
|
|
520 /* Invalid state -- bail */
|
|
|
521 return(0);
|
|
|
522 }
|
|
|
523 #endif /* !DISABLE_EVENTS */
|
|
|
524
|
|
|
525 /* Update internal joystick state */
|
|
|
526 joystick->buttons[button] = state;
|
|
|
527
|
|
|
528 /* Post the event, if desired */
|
|
|
529 posted = 0;
|
|
|
530 #ifndef DISABLE_EVENTS
|
|
|
531 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) {
|
|
|
532 event.jbutton.which = joystick->index;
|
|
|
533 event.jbutton.button = button;
|
|
|
534 event.jbutton.state = state;
|
|
|
535 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
|
|
|
536 posted = 1;
|
|
|
537 SDL_PushEvent(&event);
|
|
|
538 }
|
|
|
539 }
|
|
|
540 #endif /* !DISABLE_EVENTS */
|
|
|
541 return(posted);
|
|
|
542 }
|
|
|
543
|
|
|
544 void SDL_JoystickUpdate(void)
|
|
|
545 {
|
|
|
546 int i;
|
|
|
547
|
|
|
548 for ( i=0; SDL_joysticks[i]; ++i ) {
|
|
|
549 SDL_SYS_JoystickUpdate(SDL_joysticks[i]);
|
|
|
550 }
|
|
|
551 }
|
|
|
552
|
|
|
553 int SDL_JoystickEventState(int state)
|
|
|
554 {
|
|
|
555 #ifdef DISABLE_EVENTS
|
|
|
556 return SDL_IGNORE;
|
|
|
557 #else
|
|
|
558 const Uint8 event_list[] = {
|
|
|
559 SDL_JOYAXISMOTION, SDL_JOYBALLMOTION, SDL_JOYHATMOTION,
|
|
|
560 SDL_JOYBUTTONDOWN, SDL_JOYBUTTONUP,
|
|
|
561 };
|
|
|
562 int i;
|
|
|
563
|
|
|
564 switch (state) {
|
|
|
565 case SDL_QUERY:
|
|
|
566 state = SDL_IGNORE;
|
|
|
567 for ( i=0; i<SDL_TABLESIZE(event_list); ++i ) {
|
|
|
568 state = SDL_EventState(event_list[i],SDL_QUERY);
|
|
|
569 if ( state == SDL_ENABLE ) {
|
|
|
570 break;
|
|
|
571 }
|
|
|
572 }
|
|
|
573 break;
|
|
|
574 default:
|
|
|
575 for ( i=0; i<SDL_TABLESIZE(event_list); ++i ) {
|
|
|
576 SDL_EventState(event_list[i], state);
|
|
|
577 }
|
|
|
578 break;
|
|
|
579 }
|
|
|
580 return(state);
|
|
|
581 #endif /* DISABLE_EVENTS */
|
|
|
582 }
|
