annotate src/joystick/beos/SDL_bejoystick.cc @ 1675:d33dcfc3fde7 SDL-1.3

Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 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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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 #ifdef SDL_JOYSTICK_BEOS
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25
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26 /* This is the system specific header for the SDL joystick API */
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27
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28 #include <be/support/String.h>
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29 #include <be/device/Joystick.h>
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30
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31 extern "C"
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32 {
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33
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34 #include "SDL_joystick.h"
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35 #include "../SDL_sysjoystick.h"
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36 #include "../SDL_joystick_c.h"
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38
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39 /* The maximum number of joysticks we'll detect */
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40 #define MAX_JOYSTICKS 16
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41
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42 /* A list of available joysticks */
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43 static char *SDL_joyport[MAX_JOYSTICKS];
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44 static char *SDL_joyname[MAX_JOYSTICKS];
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45
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46 /* The private structure used to keep track of a joystick */
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47 struct joystick_hwdata
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48 {
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49 BJoystick *stick;
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50 uint8 *new_hats;
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51 int16 *new_axes;
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52 };
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53
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54 /* Function to scan the system for joysticks.
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55 * This function should set SDL_numjoysticks to the number of available
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56 * joysticks. Joystick 0 should be the system default joystick.
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57 * It should return 0, or -1 on an unrecoverable fatal error.
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58 */
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59 int SDL_SYS_JoystickInit(void)
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60 {
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61 BJoystick joystick;
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62 int numjoysticks;
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63 int i;
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64 int32 nports;
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65 char name[B_OS_NAME_LENGTH];
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66
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67 /* Search for attached joysticks */
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68 nports = joystick.CountDevices();
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69 numjoysticks = 0;
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70 SDL_memset(SDL_joyport, 0, (sizeof SDL_joyport));
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71 SDL_memset(SDL_joyname, 0, (sizeof SDL_joyname));
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72 for (i = 0; (SDL_numjoysticks < MAX_JOYSTICKS) && (i < nports); ++i)
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73 {
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74 if (joystick.GetDeviceName(i, name) == B_OK) {
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75 if (joystick.Open(name) != B_ERROR) {
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76 BString stick_name;
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77 joystick.GetControllerName(&stick_name);
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78 SDL_joyport[numjoysticks] = strdup(name);
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79 SDL_joyname[numjoysticks] = strdup(stick_name.String());
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80 numjoysticks++;
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81 joystick.Close();
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82 }
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83 }
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84 }
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85 return (numjoysticks);
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86 }
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87
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88 /* Function to get the device-dependent name of a joystick */
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89 const char *SDL_SYS_JoystickName(int index)
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90 {
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91 return SDL_joyname[index];
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92 }
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93
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94 /* Function to open a joystick for use.
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95 The joystick to open is specified by the index field of the joystick.
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96 This should fill the nbuttons and naxes fields of the joystick structure.
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97 It returns 0, or -1 if there is an error.
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98 */
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99 int SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
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100 {
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101 BJoystick *stick;
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102
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103 /* Create the joystick data structure */
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104 joystick->hwdata = (struct joystick_hwdata *)
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105 SDL_malloc(sizeof(*joystick->hwdata));
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106 if (joystick->hwdata == NULL) {
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107 SDL_OutOfMemory();
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108 return (-1);
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109 }
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110 SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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111 stick = new BJoystick;
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112 joystick->hwdata->stick = stick;
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113
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114 /* Open the requested joystick for use */
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115 if (stick->Open(SDL_joyport[joystick->index]) == B_ERROR) {
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116 SDL_SetError("Unable to open joystick");
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117 SDL_SYS_JoystickClose(joystick);
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118 return (-1);
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119 }
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120
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121 /* Set the joystick to calibrated mode */
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122 stick->EnableCalibration();
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123
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124 /* Get the number of buttons, hats, and axes on the joystick */
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125 joystick->nbuttons = stick->CountButtons();
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126 joystick->naxes = stick->CountAxes();
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127 joystick->nhats = stick->CountHats();
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128
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129 joystick->hwdata->new_axes = (int16 *)
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130 SDL_malloc(joystick->naxes * sizeof(int16));
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131 joystick->hwdata->new_hats = (uint8 *)
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132 SDL_malloc(joystick->nhats * sizeof(uint8));
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133 if (!joystick->hwdata->new_hats || !joystick->hwdata->new_axes) {
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134 SDL_OutOfMemory();
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135 SDL_SYS_JoystickClose(joystick);
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136 return (-1);
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137 }
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138
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139 /* We're done! */
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140 return (0);
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141 }
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142
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143 /* Function to update the state of a joystick - called as a device poll.
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144 * This function shouldn't update the joystick structure directly,
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145 * but instead should call SDL_PrivateJoystick*() to deliver events
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146 * and update joystick device state.
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147 */
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148 void SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
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149 {
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150 static const Uint8 hat_map[9] = {
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151 SDL_HAT_CENTERED,
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152 SDL_HAT_UP,
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153 SDL_HAT_RIGHTUP,
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154 SDL_HAT_RIGHT,
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155 SDL_HAT_RIGHTDOWN,
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156 SDL_HAT_DOWN,
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157 SDL_HAT_LEFTDOWN,
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158 SDL_HAT_LEFT,
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159 SDL_HAT_LEFTUP
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160 };
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161 const int JITTER = (32768 / 10); /* 10% jitter threshold (ok?) */
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162
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163 BJoystick *stick;
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164 int i, change;
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165 int16 *axes;
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166 uint8 *hats;
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167 uint32 buttons;
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168
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169 /* Set up data pointers */
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170 stick = joystick->hwdata->stick;
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171 axes = joystick->hwdata->new_axes;
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172 hats = joystick->hwdata->new_hats;
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173
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174 /* Get the new joystick state */
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175 stick->Update();
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176 stick->GetAxisValues(axes);
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177 stick->GetHatValues(hats);
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178 buttons = stick->ButtonValues();
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179
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180 /* Generate axis motion events */
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181 for (i = 0; i < joystick->naxes; ++i) {
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182 change = ((int32) axes[i] - joystick->axes[i]);
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183 if ((change > JITTER) || (change < -JITTER)) {
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184 SDL_PrivateJoystickAxis(joystick, i, axes[i]);
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185 }
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186 }
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187
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188 /* Generate hat change events */
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189 for (i = 0; i < joystick->nhats; ++i) {
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190 if (hats[i] != joystick->hats[i]) {
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191 SDL_PrivateJoystickHat(joystick, i, hat_map[hats[i]]);
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192 }
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193 }
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194
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195 /* Generate button events */
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196 for (i = 0; i < joystick->nbuttons; ++i) {
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197 if ((buttons & 0x01) != joystick->buttons[i]) {
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198 SDL_PrivateJoystickButton(joystick, i, (buttons & 0x01));
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199 }
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200 buttons >>= 1;
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201 }
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202 }
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203
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204 /* Function to close a joystick after use */
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205 void SDL_SYS_JoystickClose(SDL_Joystick * joystick)
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206 {
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207 if (joystick->hwdata) {
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208 joystick->hwdata->stick->Close();
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209 delete joystick->hwdata->stick;
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210 if (joystick->hwdata->new_hats) {
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211 SDL_free(joystick->hwdata->new_hats);
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212 }
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213 if (joystick->hwdata->new_axes) {
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214 SDL_free(joystick->hwdata->new_axes);
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215 }
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216 SDL_free(joystick->hwdata);
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217 joystick->hwdata = NULL;
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218 }
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219 }
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220
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221 /* Function to perform any system-specific joystick related cleanup */
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222 void SDL_SYS_JoystickQuit(void)
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223 {
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224 int i;
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225
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226 for (i = 0; SDL_joyport[i]; ++i) {
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227 SDL_free(SDL_joyport[i]);
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228 }
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229 SDL_joyport[0] = NULL;
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230
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231 for (i = 0; SDL_joyname[i]; ++i) {
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232 SDL_free(SDL_joyname[i]);
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233 }
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234 SDL_joyname[0] = NULL;
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235 }
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236
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237 }; // extern "C"
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238
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239 #endif /* SDL_JOYSTICK_BEOS */
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240 /* vi: set ts=4 sw=4 expandtab: */