docs/fbdev-dri.html

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   9 <center><h1>Mesa fbdev/DRI Drivers</h1></center>
  10 <br>
  11
  12 <h1><center>NOTE: this information is obsolete and will be removed at
  13 a future date</center></h1>
  14
  15 <h1>1. Introduction</h1>
  16
  17 <p>
  18 The fbdev/DRI environment supports hardware-accelerated 3D rendering without
  19 the X window system.  This is typically used for embedded applications.
  20 </p>
  21
  22 <p>
  23 Contributors to this project include Jon Smirl, Keith Whitwell and Dave Airlie.
  24 </p>
  25
  26 <p>
  27 Applications in the fbdev/DRI environment use
  28 the MiniGLX interface to choose pixel
  29 formats, create rendering contexts, etc.  It's a subset of the GLX and
  30 Xlib interfaces allowing some degree of application portability between
  31 the X and X-less environments.
  32 </p>
  33
  34 <p>
  35 Note that this environment is not well-supported and these instructions
  36 may not be completely up to date.
  37 </p>
  38 <br>
  39
  40
  41
  42 <h1>2. Compilation</h1>
  43 <p>
  44
  45 <h2>2.1 glxproto</h2>
  46
  47 Get <a href="http://cvsweb.xfree86.org/cvsweb/*checkout*/xc/include/GL/glxproto.h?rev=1.9">glxproto.h</a>. Copy it to the /mesa/include/GL/ directory.
  48 </p>
  49
  50 <h2>2.2 libpciaccess</h2>
  51 <p>
  52 Check if you have libpciaccess installed:
  53 </p>
  54
  55 <pre>pkg-config --modversion pciaccess
  56 </pre>
  57 <p>
  58 If not you can download the latest code from:
  59 </p>
  60 <pre>   git clone git://anongit.freedesktop.org/git/xorg/lib/libpciaccess
  61 </pre>
  62 <p>
  63 Run autogen.sh to generate a configure file. autogen.sh uses autoconf
  64 utility. This utility may not be installed with your linux distro,
  65 check if it is available. if not you can use your package manager or
  66 type:
  67 </p>
  68 <pre>sudo apt-get install autoconf
  69 </pre>
  70 The next step is to install the libpciaccess library.
  71 <pre>make
  72 make install
  73 </pre>
  74 <p> Now your libpciaccess.a file is saved into /usr/local/lib
  75 directory. If you have a libpciaccess.a in /usr/lib you may simply copy
  76 and overwrite these files. Don't forget to copy libpciaccess.pc file to
  77 /usr/lib/pkgconfig, which is also located in /usr/local/lib/pkgconfig/.
  78 Or you may use the following system variables:
  79 </p>
  80 <pre>export LD_LIBRARY_PATH=/usr/local/lib
  81 export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
  82 </pre>
  83
  84 <h2>2.3 drm</h2>
  85
  86 <p>The next step is to compile the drm. DRM consists of two seperate parts,
  87 the DRM client library(lindrm.so) and kernel device module(such as
  88 radeon.ko). We need to make a small change in kernel device module. So
  89 you need to download the kernel source. You may choose the nearest
  90 mirror from www.kernel.org, or you are using Fedora Core 5, for
  91 example, you may need to install RPMs such as:
  92 kernel-smp-devel-2.16.15-1.2054_FC5.i686.rpm
  93 kernel-devel-2.6.15-1.2054_FC5.i686.rpm
  94 etc. You can find a detailed information <a href="http://www.howtoforge.com/kernel_compilation_fedora">here.</a>
  95 </p>
  96
  97 <p>You will find drm_drv.c at /usr/src/LINUX-VERSION/drivers/char/drm/. Edit this code and comment out the following part:
  98 </p>
  99
 100 <pre>
 101    /* ||
 102    ((ioctl-&gt;flags &amp; DRM_MASTER) &amp;&amp; !priv-&gt;master)*/
 103 </pre>
 104 Now you are ready to compile your kernel. If your kernel version is
 105 identical to the version you have compiled, you can simply over write
 106 your new "ko" files over older ones. If you have compiled a different
 107 kernel, you must configure your grub or lilo to be able to boot your
 108 new kernel. <p>
 109 You'll need fbdev header files.  Check with:
 110 </p>
 111 <pre>
 112    ls -l /usr/include/linux/fb.
 113 </pre>
 114 <p>This file may be missing if you have not installed linux header files.
 115
 116
 117 <h2>2.4 Mesa</h2>
 118
 119 </p><p>Get latest development Mesa sources from git repository
 120 (currently 7.1-prerelease)
 121 </p>
 122 <pre>
 123    git clone git://anongit.freedesktop.org/git/mesa/mesa
 124 </pre>
 125
 126 <p>You will need the makedepend utility which is a part of mesa project
 127 to build your linux-solo. You probably wont have this utility. You can
 128 download its source from following git repulsitory:
 129 </p>
 130 <pre>
 131    git clone git://anongit.freedesktop.org/git/xorg/util/makedepend
 132 </pre>
 133
 134 <p>Get the latest stable mesa version from SourceForge (currently 7.0.3)
 135 <a href="http://sourceforge.net/project/showfiles.php?group_id=3">http://sourceforge.net/project/showfiles.php?group_id=3</a>
 136 </p>
 137
 138 <p>Copy the miniglx folder from 7.1-prerelease to 7.0.3.
 139 You may also extract GLUT to 7.0.3 version at this step.
 140 </p>
 141
 142 <p>Edit linux-solo.conf at /conf directory, just only compile the
 143 graphics driver you need, delete the unwanted drivers names from the
 144 list(some drivers are causing problems...)
 145 </p>
 146 <pre>
 147    while(build==0)
 148    {
 149      make linux-solo
 150
 151      There will be some missing header files, copy them from 7.1-prerelease
 152    }
 153 </pre>
 154
 155 <p>
 156 When complete you should have the following:
 157 </p>
 158 <ul>
 159 <li>lib/libGL.so - the GL library which applications link with
 160 </li><li>lib/*_dri_so - DRI drivers
 161 </li><li>lib/miniglx.conf - sample MiniGLX config file
 162 </li><li>progs/miniglx/* - several MiniGLX sample programs
 163 </li></ul>
 164
 165 To install these files into appropriate locations in system:
 166 <pre>
 167    make install
 168 </pre>
 169
 170 Now your openGL libraries are copied to /usr/local/lib and
 171 miniglx.conf is copied to /etc. You may copy them to /usr/lib and
 172 overwrite your old GL libraries. Or you may export following variable:
 173
 174 <pre>
 175    export LIBGL_DRIVERS_PATH=/usr/local/lib
 176 </pre>
 177 <br>
 178
 179
 180 <h1>3. Using fbdev/DRI</h1>
 181
 182 <p>
 183 If an X server currently running, exit/stop it so you're working from
 184 the console. Following command shuts down the x window and also the multi user support.
 185 </p>
 186 <pre>
 187    init 1
 188 </pre>
 189
 190 <p>Also you may define the runlevel as 1 in "/etc/inittab". Your system
 191 will always start in single user mode and without x-window with this
 192 option set.
 193 </p><h2>3.1 Load Kernel Modules</h2>
 194
 195 <p>
 196 You'll need to load the kernel modules specific to your graphics hardware.
 197 Typically, this consists of the agpgart module, an fbdev driver module
 198 and the DRM kernel module.
 199 </p>
 200 <p>
 201 As root, the kernel modules can be loaded as follows:
 202 </p>
 203
 204 <p>
 205 If you have Intel i915/i945 hardware:
 206 </p>
 207 <pre>   modprobe agpgart            # the AGP GART module
 208    modprobe intelfb            # the Intel fbdev driver
 209    modprobe i915               # the i915/945 DRI kernel module
 210 </pre>
 211
 212 <p>
 213 If you have ATI Radeon/R200 hardware:
 214 </p>
 215 <pre>   modprobe agpgart            # the AGP GART module
 216    modprobe radeonfb           # the Radeon fbdev driver
 217    modprobe radeon             # the Radeon DRI kernel module
 218 </pre>
 219
 220 <p>
 221 If you have ATI Rage 128 hardware:
 222 </p>
 223 <pre>   modprobe agpgart            # the AGP GART module
 224    modprobe aty128fb           # the Rage 128 fbdev driver
 225    modprobe r128               # the Rage 128 DRI kernel module
 226 </pre>
 227
 228 <p>
 229 If you have Matrox G200/G400 hardware:
 230 </p>
 231 <pre>   modprobe agpgart            # the AGP GART module
 232    modprobe mgafb              # the Matrox fbdev driver
 233    modprobe mga                # the Matrox DRI kernel module
 234 </pre>
 235
 236 <p>
 237 To verify that the agpgart, fbdev and drm modules are loaded:
 238 </p>
 239 <pre>   ls -l /dev/agpgart /dev/fb* /dev/dri
 240 </pre>
 241 <p>
 242 Alternately, use lsmod to inspect the currently installed modules.
 243 If you have problems, look at the output of dmesg.
 244 </p>
 245
 246
 247 <h2>3.2 Configuration File</h2>
 248
 249 <p>
 250 review/edit /etc/miniglx.conf.
 251 Alternately, the MINIGLX_CONF environment variable can be used to
 252 indicate the location of miniglx.conf
 253 </p>
 254
 255 To determine the pciBusID value, run lspci and examine the output.
 256 For example:
 257 <p></p>
 258 <pre>   /sbin/lspci:
 259    00:02.0 VGA compatible controller: Intel Corporation 82915G/GV/910GL Express Chipset Family Graphics Controller (rev 04)
 260 </pre>
 261 <p>
 262 00:02.0 indicates that pciBusID should be PCI:0:2:0
 263 </p>
 264
 265
 266
 267
 268 <h2>3.3 Running fbdev/DRI Programs</h2>
 269
 270 <p>
 271 Make sure your LD_LIBRARY_PATH environment variable is set to the
 272 location of the libGL.so library.  You may need to append other paths
 273 to LD_LIBRARY_PATH if libpciaccess.so is in a non-standard location,
 274 for example.
 275 </p>
 276
 277 <p>
 278 Change to the <code>Mesa/progs/miniglx/</code> directory and
 279 start the sample_server program in the background:
 280 </p>
 281 <pre>   ./sample_server &amp;
 282 </pre>
 283
 284 <p>
 285 Then try running the <code>miniglxtest</code> program:
 286 </p>
 287 <pre>   ./miniglxtest
 288 </pre>
 289 <p>
 290 You should see a rotating quadrilateral which changes color as it rotates.
 291 It will exit automatically after a bit.
 292 </p>
 293
 294 <p>
 295 If you run other tests in the miniglx/ directory, you may want to run
 296 them from a remote shell so that you can stop them with ctrl-C.
 297 </p>
 298 <br>
 299
 300
 301 <h1>4.0 Troubleshooting</h1>
 302
 303 <ol>
 304 <li>
 305 If you try to run miniglxtest and get the following:
 306 <br>
 307 <pre>   [miniglx] failed to probe chipset
 308    connect: Connection refused
 309    server connection lost
 310 </pre>
 311 It means that the sample_server process is not running.
 312 <br>
 313 <br>
 314 </li>
 315 </ol>
 316
 317
 318 <h1>5.0 Programming Information</h1>
 319
 320 <p>
 321 OpenGL/Mesa is interfaced to fbdev via the MiniGLX interface.
 322 MiniGLX is a subset of Xlib and GLX API functions which provides just
 323 enough functionality to setup OpenGL rendering and respond to simple
 324 input events.
 325 </p>
 326
 327 <p>
 328 Since MiniGLX is a subset of the usual Xlib and GLX APIs, programs written
 329 to the MiniGLX API can also be run on full Xlib/GLX implementations.
 330 This allows some degree of flexibility for software development and testing.
 331 </p>
 332
 333 <p>
 334 However, the MiniGLX API is not binary-compatible with full Xlib/GLX.
 335 Some of the structures are different and some macros/functions work
 336 differently.
 337 See the GL/miniglx.h header file for details.
 338 </p>
 339
 340
 341
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