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annotate src/haptic/SDL_haptic.c @ 2472:3f73c88c9abb gsoc2008_force_feedback

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First commit of the SDL_haptic subsystem. Code compiles and works, very limited functionality (linux only).
author Edgar Simo <bobbens@gmail.com>
date Sun, 01 Jun 2008 11:44:25 +0000
parents
children 3f80bf1528b4
rev   line source
2472
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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 and initialize the haptic */
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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_memset(haptic, 0, (sizeof *haptic));
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112 haptic->index = device_index;
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113 if (SDL_SYS_HapticOpen(haptic) < 0) {
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114 SDL_free(haptic);
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115 haptic = NULL;
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116 } else {
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117 }
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118 }
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119 if (haptic) {
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120 /* Add haptic to list */
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121 ++haptic->ref_count;
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122 for (i = 0; SDL_haptics[i]; ++i)
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123 /* Skip to next haptic */ ;
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124 SDL_haptics[i] = haptic;
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125 }
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126 return haptic;
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127 }