Mercurial > sdl-ios-xcode
annotate src/haptic/SDL_haptic.c @ 2479:b9eb2cfe16cd gsoc2008_force_feedback
Added some preliminary support for haptic effect control.
author | Edgar Simo <bobbens@gmail.com> |
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date | Mon, 30 Jun 2008 21:38:29 +0000 |
parents | 4fd783e0f34b |
children | b883974445fc |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 2008 Edgar Simo |
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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 #include "SDL_haptic_c.h" |
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25 #include "SDL_syshaptic.h" |
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26 |
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27 |
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28 static Uint8 SDL_numhaptics = 0; |
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29 SDL_Haptic **SDL_haptics = NULL; |
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30 static SDL_Haptic *default_haptic = NULL; |
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31 |
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32 |
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33 /* |
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34 * Initializes the Haptic devices. |
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35 */ |
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36 int |
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37 SDL_HapticInit(void) |
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38 { |
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39 int arraylen; |
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40 int status; |
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41 |
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42 SDL_numhaptics = 0; |
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43 status = SDL_SYS_HapticInit(); |
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44 if (status >= 0) { |
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45 arraylen = (status + 1) * sizeof(*SDL_haptics); |
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46 SDL_haptics = (SDL_Haptic **) SDL_malloc(arraylen); |
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47 if (SDL_haptics == NULL) { |
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48 SDL_numhaptics = 0; |
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49 } else { |
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50 SDL_memset(SDL_haptics, 0, arraylen); |
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51 SDL_numhaptics = status; |
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52 } |
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53 status = 0; |
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54 } |
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55 default_haptic = NULL; |
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56 |
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57 return status; |
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58 } |
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59 |
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60 |
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61 /* |
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62 * Returns the number of available devices. |
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63 */ |
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64 int |
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65 SDL_NumHaptics(void) |
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66 { |
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67 return SDL_numhaptics; |
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68 } |
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69 |
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70 |
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71 /* |
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72 * Gets the name of a Haptic device by index. |
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73 */ |
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74 const char * |
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75 SDL_HapticName(int device_index) |
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76 { |
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77 if ((device_index < 0) || (device_index >= SDL_numhaptics)) { |
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78 SDL_SetError("There are %d haptic devices available", SDL_numhaptics); |
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79 return NULL; |
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80 } |
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81 return SDL_SYS_HapticName(device_index); |
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82 } |
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83 |
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84 |
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85 /* |
2475 | 86 * Opens a Haptic device. |
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87 */ |
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88 SDL_Haptic * |
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89 SDL_HapticOpen(int device_index) |
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90 { |
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91 int i; |
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92 SDL_Haptic *haptic; |
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93 |
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94 if ((device_index < 0) || (device_index >= SDL_numhaptics)) { |
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95 SDL_SetError("There are %d haptic devices available", SDL_numhaptics); |
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96 return NULL; |
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97 } |
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98 |
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99 /* If the haptic is already open, return it */ |
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100 for (i=0; SDL_haptics[i]; i++) { |
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101 if (device_index == SDL_haptics[i]->index) { |
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102 haptic = SDL_haptics[i]; |
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103 ++haptic->ref_count; |
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104 return haptic; |
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105 } |
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106 } |
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107 |
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108 /* Create the haptic device */ |
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109 haptic = (SDL_Haptic *) SDL_malloc((sizeof *haptic)); |
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110 if (haptic == NULL) { |
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111 SDL_OutOfMemory(); |
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112 return NULL; |
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113 } |
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114 |
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115 /* Initialize the haptic device */ |
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116 SDL_memset(haptic, 0, (sizeof *haptic)); |
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117 haptic->index = device_index; |
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118 if (SDL_SYS_HapticOpen(haptic) < 0) { |
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119 SDL_free(haptic); |
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120 return NULL; |
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121 } |
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122 |
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123 /* Add haptic to list */ |
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124 ++haptic->ref_count; |
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125 for (i = 0; SDL_haptics[i]; ++i) |
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126 /* Skip to next haptic */ ; |
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127 SDL_haptics[i] = haptic; |
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128 |
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129 return haptic; |
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130 } |
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131 |
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132 |
2475 | 133 /* |
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134 * Checks to see if the haptic device is valid |
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135 */ |
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136 static int |
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137 ValidHaptic(SDL_Haptic ** haptic) |
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138 { |
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139 int valid; |
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140 |
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141 if (*haptic == NULL) { |
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142 SDL_SetError("Haptic device hasn't been opened yet"); |
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143 valid = 0; |
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144 } else { |
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145 valid = 1; |
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146 } |
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147 return valid; |
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148 } |
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149 |
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150 |
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151 /* |
2475 | 152 * Closes a SDL_Haptic device. |
153 */ | |
154 void | |
155 SDL_HapticClose(SDL_Haptic * haptic) | |
156 { | |
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157 int i; |
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158 |
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159 /* Must be valid */ |
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160 if (!ValidHaptic(&haptic)) { |
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161 return; |
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162 } |
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163 |
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164 /* Check if it's still in use */ |
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165 if (--haptic->ref_count < 0) { |
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166 return; |
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167 } |
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168 |
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169 /* Close it */ |
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170 SDL_SYS_HapticClose(haptic); |
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171 |
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172 /* Remove from the list */ |
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173 for (i = 0; SDL_haptics[i]; ++i) { |
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174 if (haptic == SDL_haptics[i]) { |
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175 SDL_memcpy(&SDL_haptics[i], &SDL_haptics[i + 1], |
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176 (SDL_numhaptics - i) * sizeof(haptic)); |
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177 break; |
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178 } |
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179 } |
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180 |
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181 /* Free */ |
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182 SDL_free(haptic); |
2475 | 183 } |
184 | |
185 /* | |
186 * Cleans up after the subsystem. | |
187 */ | |
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188 void |
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189 SDL_HapticQuit(void) |
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190 { |
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191 SDL_numhaptics = 0; |
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192 |
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193 SDL_SYS_HapticQuit(); |
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194 if (SDL_haptics != NULL) { |
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195 SDL_free(SDL_haptics); |
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196 SDL_haptics = NULL; |
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197 } |
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198 } |
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199 |
2478
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200 /* |
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201 * Returns the number of effects a haptic device has. |
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202 */ |
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203 int |
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204 SDL_HapticNumEffects(SDL_Haptic * haptic) |
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205 { |
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206 if (!ValidHaptic(&haptic)) { |
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207 return -1; |
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208 } |
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209 |
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210 return haptic->neffects; |
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211 } |
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212 |
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213 /* |
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214 * Returns supported effects by the device. |
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215 */ |
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216 unsigned int |
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217 SDL_HapticQueryEffects(SDL_Haptic * haptic) |
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218 { |
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219 if (!ValidHaptic(&haptic)) { |
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220 return -1; |
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221 } |
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222 |
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223 return haptic->supported; |
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224 } |
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225 |
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226 int |
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227 SDL_HapticEffectSupported(SDL_Haptic * haptic, SDL_HapticEffect * effect) |
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228 { |
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229 if (!ValidHaptic(&haptic)) { |
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230 return -1; |
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231 } |
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232 |
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233 if ((haptic->supported & effect->type) != 0) |
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234 return SDL_TRUE; |
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235 return SDL_FALSE; |
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236 } |
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237 |
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238 /* |
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239 * Creates a new haptic effect. |
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240 */ |
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241 int |
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242 SDL_HapticNewEffect(SDL_Haptic * haptic, SDL_HapticEffect * effect) |
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243 { |
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244 int i; |
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245 |
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246 /* Check for device validity. */ |
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247 if (!ValidHaptic(&haptic)) { |
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248 return -1; |
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249 } |
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250 |
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251 /* See if there's a free slot */ |
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252 for (i=0; i<haptic->neffects; i++) { |
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253 if (haptic->effects[i].hweffect == NULL) { |
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254 |
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255 /* Now let the backend create the real effect */ |
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256 if (SDL_SYS_HapticNewEffect(haptic,&haptic->effects[i]) != 0) { |
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257 return -1; /* Backend failed to create effect */ |
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258 } |
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259 return i; |
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260 } |
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261 } |
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262 |
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263 SDL_SetError("Haptic device has no free space left."); |
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264 return -1; |
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265 } |
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266 |
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267 /* |
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268 * Runs the haptic effect on the device. |
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269 */ |
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270 int |
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271 SDL_HapticRunEffect(SDL_Haptic * haptic, int effect) |
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272 { |
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273 if (!ValidHaptic(&haptic)) { |
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274 return -1; |
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275 } |
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276 |
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277 /* Run the effect */ |
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278 if (SDL_SYS_HapticRunEffect(haptic,&haptic->effects[effect]) < 0) { |
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279 return -1; |
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280 } |
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281 |
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282 return 0; |
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283 } |
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284 |
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285 /* |
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286 * Gets rid of a haptic effect. |
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287 */ |
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288 void |
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289 SDL_HapticDestroyEffect(SDL_Haptic * haptic, int effect) |
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290 { |
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291 if (!ValidHaptic(&haptic)) { |
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292 return; |
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293 } |
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294 |
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295 /* Not allocated */ |
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296 if (haptic->effects[effect].hweffect == NULL) { |
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297 return; |
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298 } |
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299 |
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300 SDL_SYS_HapticDestroyEffect(haptic, &haptic->effects[effect]); |
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301 } |
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302 |
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303 |