annotate docs/html/sdljoystickgetball.html @ 3335:b8d313de8a65

Adam Strzelecki to SDL Since current DirectFB implementation is incomplete for YUV surfaces (actually causes segmentation faults when trying Lock and use YUV planar textures) I decided to fix it a bit. Here's a patch that should make DirectFB properly support YUV both packed and planar (3 planes). (1) Removed SDL_BYTESPERPIXEL at all in favor of DFB_BYTES_PER_PIXEL(SDLToDFBPixelFormat(fmt)) which does return always proper BPP for YUVs too, coz SDL_BYTESPERPIXEL returns incorrect values for FOURCCs (2) Fixed data->pixels allocation for planar YUVs in CreateTexture, it should allocate 150% more space (3) Copy other planes for planar YUVs in UpdateTexture (4) Moved checking if format is supported at all with DirectFB on CreateTexture at the beginning of the code Waiting for comments, -- Adam Strzelecki | nanoant.com
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Oct 2009 04:03:37 +0000
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4 >SDL_JoystickGetBall</TITLE
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6 NAME="GENERATOR"
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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8 "><LINK
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9 REL="HOME"
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10 TITLE="SDL Library Documentation"
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13 TITLE="Joystick"
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39 ALIGN="center"
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40 >SDL Library Documentation</TH
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41 ></TR
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50 >Prev</A
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51 ></TD
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61 ><A
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62 HREF="sdljoystickclose.html"
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65 ></TD
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72 ><A
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73 NAME="SDLJOYSTICKGETBALL"
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74 ></A
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75 >SDL_JoystickGetBall</H1
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76 ><DIV
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77 CLASS="REFNAMEDIV"
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81 ><H2
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82 >Name</H2
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83 >SDL_JoystickGetBall&nbsp;--&nbsp;Get relative trackball motion</DIV
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84 ><DIV
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85 CLASS="REFSYNOPSISDIV"
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89 ><H2
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90 >Synopsis</H2
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91 ><DIV
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92 CLASS="FUNCSYNOPSIS"
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99 CLASS="FUNCSYNOPSISINFO"
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100 >#include "SDL.h"</PRE
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101 ><P
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102 ><CODE
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103 ><CODE
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104 CLASS="FUNCDEF"
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105 >int <B
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106 CLASS="FSFUNC"
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107 >SDL_JoystickGetBall</B
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108 ></CODE
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109 >(SDL_Joystick *joystick, int ball, int *dx, int *dy);</CODE
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110 ></P
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111 ><P
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113 ></DIV
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117 ><A
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120 ><H2
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121 >Description</H2
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122 ><P
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123 >Get the <TT
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124 CLASS="PARAMETER"
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125 ><I
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126 >ball</I
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127 ></TT
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128 > axis change.</P
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129 ><P
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130 >Trackballs can only return relative motion since the last call to <TT
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131 CLASS="FUNCTION"
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132 >SDL_JoystickGetBall</TT
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133 >, these motion deltas a placed into <TT
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134 CLASS="PARAMETER"
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135 ><I
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136 >dx</I
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137 ></TT
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138 > and <TT
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139 CLASS="PARAMETER"
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140 ><I
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141 >dy</I
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142 ></TT
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143 >.</P
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144 ></DIV
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145 ><DIV
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146 CLASS="REFSECT1"
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147 ><A
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149 ></A
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150 ><H2
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151 >Return Value</H2
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152 ><P
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153 >Returns <SPAN
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154 CLASS="RETURNVALUE"
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155 >0</SPAN
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156 > on success or <SPAN
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157 CLASS="RETURNVALUE"
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158 >-1</SPAN
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159 > on failure</P
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160 ></DIV
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161 ><DIV
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162 CLASS="REFSECT1"
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163 ><A
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164 NAME="AEN6456"
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165 ></A
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166 ><H2
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167 >Examples</H2
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168 ><P
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169 ><PRE
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170 CLASS="PROGRAMLISTING"
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171 >int delta_x, delta_y;
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172 SDL_Joystick *joy;
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173 .
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174 .
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175 .
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176 SDL_JoystickUpdate();
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177 if(SDL_JoystickGetBall(joy, 0, &#38;delta_x, &#38;delta_y)==-1)
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178 printf("TrackBall Read Error!\n");
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179 printf("Trackball Delta- X:%d, Y:%d\n", delta_x, delta_y);</PRE
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180 ></P
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181 ></DIV
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182 ><DIV
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183 CLASS="REFSECT1"
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184 ><A
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185 NAME="AEN6460"
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186 ></A
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187 ><H2
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188 >See Also</H2
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189 ><P
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190 ><A
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191 HREF="sdljoysticknumballs.html"
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192 ><TT
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193 CLASS="FUNCTION"
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194 >SDL_JoystickNumBalls</TT
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195 ></A
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196 ></P
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197 ></DIV
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198 ><DIV
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199 CLASS="NAVFOOTER"
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200 ><HR
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201 ALIGN="LEFT"
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202 WIDTH="100%"><TABLE
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203 SUMMARY="Footer navigation table"
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204 WIDTH="100%"
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205 BORDER="0"
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206 CELLPADDING="0"
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207 CELLSPACING="0"
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208 ><TR
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209 ><TD
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210 WIDTH="33%"
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211 ALIGN="left"
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212 VALIGN="top"
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213 ><A
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214 HREF="sdljoystickgetbutton.html"
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215 ACCESSKEY="P"
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216 >Prev</A
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217 ></TD
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218 ><TD
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219 WIDTH="34%"
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220 ALIGN="center"
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221 VALIGN="top"
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222 ><A
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223 HREF="index.html"
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224 ACCESSKEY="H"
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225 >Home</A
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226 ></TD
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227 ><TD
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228 WIDTH="33%"
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229 ALIGN="right"
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230 VALIGN="top"
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231 ><A
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232 HREF="sdljoystickclose.html"
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233 ACCESSKEY="N"
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234 >Next</A
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235 ></TD
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236 ></TR
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237 ><TR
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238 ><TD
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239 WIDTH="33%"
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240 ALIGN="left"
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241 VALIGN="top"
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242 >SDL_JoystickGetButton</TD
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243 ><TD
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244 WIDTH="34%"
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245 ALIGN="center"
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246 VALIGN="top"
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247 ><A
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248 HREF="joystick.html"
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249 ACCESSKEY="U"
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250 >Up</A
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251 ></TD
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252 ><TD
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253 WIDTH="33%"
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254 ALIGN="right"
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255 VALIGN="top"
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256 >SDL_JoystickClose</TD
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257 ></TR
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258 ></TABLE
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259 ></DIV
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260 ></BODY
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261 ></HTML
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262 >