annotate src/haptic/SDL_haptic.c @ 2480:b883974445fc gsoc2008_force_feedback

Some more error reporting. Added periodic effect. Confirmed it works.
author Edgar Simo <bobbens@gmail.com>
date Tue, 01 Jul 2008 09:22:22 +0000
parents b9eb2cfe16cd
children 9d52368ebcf5
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 /*
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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
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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 /*
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152 * Closes a SDL_Haptic device.
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153 */
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154 void
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155 SDL_HapticClose(SDL_Haptic * haptic)
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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;
242d8a668ebb * Implemented opening and closing of haptic devices.
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162 }
242d8a668ebb * Implemented opening and closing of haptic devices.
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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 }
242d8a668ebb * Implemented opening and closing of haptic devices.
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168
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169 /* Close it, properly removing effects if needed */
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170 for (i=0; i<haptic->neffects; i++) {
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171 if (haptic->effects[i].hweffect != NULL) {
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172 SDL_HapticDestroyEffect(haptic,i);
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173 }
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174 }
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175 SDL_SYS_HapticClose(haptic);
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176
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177 /* Remove from the list */
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178 for (i = 0; SDL_haptics[i]; ++i) {
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179 if (haptic == SDL_haptics[i]) {
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180 SDL_memcpy(&SDL_haptics[i], &SDL_haptics[i + 1],
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181 (SDL_numhaptics - i) * sizeof(haptic));
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182 break;
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183 }
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184 }
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185
242d8a668ebb * Implemented opening and closing of haptic devices.
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186 /* Free */
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187 SDL_free(haptic);
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188 }
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189
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190 /*
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191 * Cleans up after the subsystem.
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192 */
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193 void
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194 SDL_HapticQuit(void)
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195 {
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196 SDL_numhaptics = 0;
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197
3f80bf1528b4 Properly quit the SDL_haptic subsystem.
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198 SDL_SYS_HapticQuit();
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199 if (SDL_haptics != NULL) {
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200 SDL_free(SDL_haptics);
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201 SDL_haptics = NULL;
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202 }
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203 }
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204
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205 /*
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206 * Returns the number of effects a haptic device has.
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207 */
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208 int
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209 SDL_HapticNumEffects(SDL_Haptic * haptic)
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210 {
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211 if (!ValidHaptic(&haptic)) {
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212 return -1;
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213 }
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214
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215 return haptic->neffects;
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216 }
4fd783e0f34b Added query functions for haptic devices.
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217
4fd783e0f34b Added query functions for haptic devices.
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218 /*
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219 * Returns supported effects by the device.
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220 */
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221 unsigned int
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222 SDL_HapticQueryEffects(SDL_Haptic * haptic)
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223 {
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224 if (!ValidHaptic(&haptic)) {
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225 return -1;
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226 }
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227
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228 return haptic->supported;
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229 }
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230
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231 int
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232 SDL_HapticEffectSupported(SDL_Haptic * haptic, SDL_HapticEffect * effect)
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233 {
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234 if (!ValidHaptic(&haptic)) {
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235 return -1;
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236 }
4fd783e0f34b Added query functions for haptic devices.
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237
4fd783e0f34b Added query functions for haptic devices.
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238 if ((haptic->supported & effect->type) != 0)
4fd783e0f34b Added query functions for haptic devices.
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239 return SDL_TRUE;
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240 return SDL_FALSE;
4fd783e0f34b Added query functions for haptic devices.
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diff changeset
241 }
2477
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242
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diff changeset
243 /*
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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244 * Creates a new haptic effect.
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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245 */
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
246 int
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
247 SDL_HapticNewEffect(SDL_Haptic * haptic, SDL_HapticEffect * effect)
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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248 {
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diff changeset
249 int i;
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
250
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
251 /* Check for device validity. */
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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252 if (!ValidHaptic(&haptic)) {
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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253 return -1;
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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254 }
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
255
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diff changeset
256 /* Check to see if effect is supported */
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diff changeset
257 if (SDL_HapticEffectSupported(haptic,effect)==SDL_FALSE) {
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diff changeset
258 SDL_SetError("Haptic effect not supported by haptic device.");
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259 return -1;
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diff changeset
260 }
b883974445fc Some more error reporting.
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diff changeset
261
2477
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diff changeset
262 /* See if there's a free slot */
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
263 for (i=0; i<haptic->neffects; i++) {
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
264 if (haptic->effects[i].hweffect == NULL) {
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
265
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
266 /* Now let the backend create the real effect */
2480
b883974445fc Some more error reporting.
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diff changeset
267 if (SDL_SYS_HapticNewEffect(haptic,&haptic->effects[i],effect) != 0) {
2477
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diff changeset
268 return -1; /* Backend failed to create effect */
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diff changeset
269 }
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
270 return i;
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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parents: 2476
diff changeset
271 }
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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parents: 2476
diff changeset
272 }
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
273
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
274 SDL_SetError("Haptic device has no free space left.");
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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275 return -1;
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diff changeset
276 }
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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parents: 2476
diff changeset
277
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
Edgar Simo <bobbens@gmail.com>
parents: 2476
diff changeset
278 /*
2480
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diff changeset
279 * Checks to see if an effect is valid.
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diff changeset
280 */
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diff changeset
281 static int
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diff changeset
282 ValidEffect(SDL_Haptic * haptic, int effect)
b883974445fc Some more error reporting.
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parents: 2479
diff changeset
283 {
b883974445fc Some more error reporting.
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diff changeset
284 if ((effect < 0) || (effect >= haptic->neffects)) {
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diff changeset
285 SDL_SetError("Invalid haptic effect identifier.");
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diff changeset
286 return 0;
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diff changeset
287 }
b883974445fc Some more error reporting.
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diff changeset
288 return 1;
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diff changeset
289 }
b883974445fc Some more error reporting.
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diff changeset
290
b883974445fc Some more error reporting.
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diff changeset
291 /*
2477
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292 * Runs the haptic effect on the device.
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
293 */
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
294 int
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
295 SDL_HapticRunEffect(SDL_Haptic * haptic, int effect)
97f75ea43a93 Starting to add infrastructure to handle haptic effects.
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diff changeset
296 {
2480
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diff changeset
297 if (!ValidHaptic(&haptic) || !ValidEffect(haptic,effect)) {
2477
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diff changeset
298 return -1;
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diff changeset
299 }
2479
b9eb2cfe16cd Added some preliminary support for haptic effect control.
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diff changeset
300
b9eb2cfe16cd Added some preliminary support for haptic effect control.
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diff changeset
301 /* Run the effect */
b9eb2cfe16cd Added some preliminary support for haptic effect control.
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parents: 2478
diff changeset
302 if (SDL_SYS_HapticRunEffect(haptic,&haptic->effects[effect]) < 0) {
b9eb2cfe16cd Added some preliminary support for haptic effect control.
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diff changeset
303 return -1;
b9eb2cfe16cd Added some preliminary support for haptic effect control.
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parents: 2478
diff changeset
304 }
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305
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306 return 0;
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307 }
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308
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309 /*
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310 * Gets rid of a haptic effect.
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311 */
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312 void
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313 SDL_HapticDestroyEffect(SDL_Haptic * haptic, int effect)
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314 {
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315 if (!ValidHaptic(&haptic) || !ValidEffect(haptic,effect)) {
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316 return;
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317 }
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318
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319 /* Not allocated */
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320 if (haptic->effects[effect].hweffect == NULL) {
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321 return;
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322 }
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323
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324 SDL_SYS_HapticDestroyEffect(haptic, &haptic->effects[effect]);
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325 }
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326
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327