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authorReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
committerReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
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+<html>
+
+<TITLE>Mesa fbdev/DRI Environment</TITLE>
+
+<link rel="stylesheet" type="text/css" href="mesa.css"></head>
+
+<BODY>
+
+<center><H1>Mesa fbdev/DRI Drivers</H1></center>
+
+
+<H1>1. Introduction</H1>
+
+<p>
+The fbdev/DRI sub-project within Mesa brings hardware accelerated OpenGL
+rendering to the Linux fbdev environment.
+The X Window System / XFree86 is not needed.
+</p>
+
+<p>
+Basically, the <a href="http://dri.sf.net/">DRI</a> drivers for hardware
+accelerated OpenGL for XFree86 have been ported to fbdev so that X is
+not needed.
+This means fbdev/DRI works in full-screen mode only.
+</p>
+
+<p>
+DRI driver writers may find this simplified environment easier to work in,
+compared to the full XFree86/DRI environment.
+</p>
+
+<p>
+Much of the work for this project has been done by Jon Smirl and
+Keith Whitwell.
+</p>
+
+<p>
+To use fbdev/DRI, you'll need a Linux 2.4 or 2.6 kernel.
+</p>
+
+<h3>Background Info</h3>
+
+<p>
+The Mesa-based DRI drivers used to be hosted in the DRI tree (which is
+basically a copy of the XFree86 tree).
+Since the Mesa-based DRI drivers are moreso "Mesa drivers" than "XFree86
+drivers" and the fact that with some work, the drivers could be used
+without X, the driver code was moved into the Mesa tree.
+</p>
+
+<p>
+So now the DRI drivers can be compiled for two different environments:
+fbdev and XFree86.
+To build the drivers for XFree86, one has to download/build the DRI
+source tree.
+Eventually, we'd like to be able to build the drivers for XFree86 outside
+of the XFree86/DRI trees.
+</p>
+
+
+
+
+<h1>2. Compilation</h1>
+
+<h2>2.1 Compiling the DRM modules</h2>
+
+<p>
+First, you'll need the DRM (Direct Rendering Manager) kernel module sources.
+They're found in a module of the DRI CVS tree.
+To obtain the code do the following:
+</p>
+<pre>
+ cvs -d:pserver:anonymous@pdx.freedesktop.org:/cvs/dri login
+</pre>
+<p>
+Press Enter/Return when prompted for a password. Then,
+</p>
+<pre>
+ cvs -d:pserver:anonymous@pdx.freedesktop.org:/cvs/dri co drm
+</pre>
+
+<p>
+Compile the DRM kernel modules:
+</p>
+<pre>
+ cd drm/linux
+ make
+</pre>
+
+<p>
+Note: you may need to be root in order to make a few symlinks.
+</p>
+<p>
+When compilation is done, you should have at least the following
+kernel modules:
+</p>
+<pre>
+ gamma.o
+ i810.o
+ i830.o
+ mach64.o
+ mga.o
+ r128.o
+ radeon.o
+ savage.o
+ sis.o
+ tdfx.o
+ via.o
+</pre>
+<p>
+You'll probably want to copy/move them into your kernel module directory
+(for example: <code>/lib/modules/2.4.18-14/kernel/drivers/char/drm/</code>).
+</p>
+
+
+
+<h2>2.2 Compiling the Mesa drivers</h2>
+
+<p>
+Begin by editing the <code>Mesa/configs/default</code> file to set
+the <code>DRM_SOURCE_PATH</code> variable.
+Set it to the location where the DRM module sources are located.
+For example, if your current directory in step 2.1 was <code>/home/fred/</code>
+set DRM_SOURCE_PATH to <code>/home/fred/drm</code>
+</p>
+
+<p>
+Next, assuming you're starting with a fresh Mesa CVS checkout,
+do the following:
+</p>
+<pre>
+ make linux-solo
+</pre>
+
+<p>
+If you previously built the source tree, run <code>make realclean</code>
+first to remove the old object files.
+</p>
+
+<p>
+When this is finished, check the <code>Mesa/lib/</code> directory
+to verify that the following files were made:
+</p>
+
+<ul>
+<li><code>libGL.so.1.2</code> - the client-side OpenGL library
+ (and a few symlinks to it).
+<li><code>libGLU.so.1.1</code> - the GLU library (and a few symlinks to it).
+<li><code>libglut.so.3.7</code> - the GLUT library (and a few symlinks to it).
+<li><code>mga_dri.so</code> - DRI driver for Matrox G200/G400 cards.
+<li><code>r128_dri.so</code> - DRI driver for ATI Rage 128 cards.
+<li><code>r200_dri.so</code> - DRI driver for ATI R200 Radeon cards.
+<li><code>radeon_dri.so</code> - DRI driver for original ATI Radeon cards.
+<li><code>i810_dri.so</code> - DRI driver for Intel i810/i815 chips.
+<li><code>i830_dri.so</code> - DRI driver for Intel i830/i845 chips.
+<li><code>mga_dri.so</code> - DRI driver for Matrox G200/G400 cards.
+<li><code>sis_dri.so</code> - DRI driver for SIS cards.
+<li><code>tdfx_dri.so</code> - DRI driver for 3dfx Voodoo 3/4/5 cards.
+<li><code>gamma_dri.so</code> - DRI driver for 3Dlabs gamma cards.
+<li><code>fb_dri.so</code> - software-only fbdev driver.
+<li><code>miniglx.conf</code> - configuration file for the MiniGLX interface
+</ul>
+
+
+<h1>3. Using fbdev/DRI</h1>
+
+<p>
+If XFree86 is currently running, exit/stop the X server so you're
+working from the console.
+</p>
+
+
+<h2>3.1 Load Kernel Modules</h2>
+
+<p>
+You'll need to load the kernel modules specific to your graphics hardware.
+Typically, this consists of the agpgart module, an fbdev driver module
+and the DRM kernel module (from step 2.1).
+</p>
+
+
+<p>
+If you have ATI Radeon/R200 hardware, run as root:
+</p>
+<pre>
+ modprobe agpgart # the AGP GART module
+ modprobe radeonfb # the Radeon fbdev driver
+ modprobe radeon # the Radeon DRI kernel module
+</pre>
+
+<p>
+If you have ATI Rage 128 hardware, run as root:
+</p>
+<pre>
+ modprobe agpgart # the AGP GART module
+ modprobe aty128fb # the Rage 128 fbdev driver
+ modprobe r128 # the Rage 128 DRI kernel module
+</pre>
+
+<p>
+If you have Matrox G200/G400 hardware, run as root:
+</p>
+<pre>
+ modprobe agpgart # the AGP GART module
+ modprobe mgafb # the Matrox fbdev driver
+ modprobe mga # the Matrox DRI kernel module
+</pre>
+
+<p>
+Then run <code>lsmod</code> to be sure the modules are loaded.
+For a Radeon card, you should see something like this:
+</p>
+<pre>
+Module Size Used by Not tainted
+radeon 110308 0 (unused)
+radeonfb 21900 0 (unused)
+agpgart 43072 1
+</pre>
+
+
+
+<h2>3.2 Configuration File</h2>
+
+<p>
+The <code>Mesa/lib/miniglx.conf</code> file should be installed
+in <code>/etc/</code>.
+</p>
+
+<p>
+Edit <code>/etc/miniglx.conf</code> to be sure it's set up correctly
+for your hardware.
+Comments in the file explain the options.
+</p>
+
+
+<h2>3.3 Running fbdev/DRI Programs</h2>
+
+<p>
+Make sure your LD_LIBRARY_PATH environment variable is set to the
+<code>Mesa/lib/</code> directory.
+</p>
+
+<p>
+Change to the <code>Mesa/progs/miniglx/</code> directory and
+start the sample_server program in the background:
+</p>
+<pre>
+ ./sample_server &
+</pre>
+
+<p>
+Then try running the <code>miniglxtest</code> program:
+</p>
+<pre>
+ ./miniglxtest
+</pre>
+<p>
+You should see a rotating quadrilateral which changes color as it rotates.
+It will exit automatically after a bit.
+</p>
+
+<p>
+If you run other tests in the miniglx/ directory, you may want to run
+them from a remote shell so that you can stop them with ctrl-C.
+</p>
+
+
+
+<h1>4.0 Troubleshooting</h1>
+
+<p>
+If you try to run miniglxtest and get the following:
+</p>
+<pre>
+ [miniglx] failed to probe chipset
+ connect: Connection refused
+ server connection lost
+</pre>
+<p>
+It means that the sample_server process is not running.
+</p>
+
+
+
+
+<h1>5.0 Programming Information</h1>
+
+<p>
+The full OpenGL API is available with fbdev/DRI.
+</p>
+
+<p>
+OpenGL/Mesa is interfaced to fbdev via the <a href="MiniGLX.html">MiniGLX</a>
+interface.
+MiniGLX is a subset of Xlib and GLX API functions which provides just
+enough functionality to setup OpenGL rendering and respond to simple
+input events.
+</p>
+
+<p>
+Since MiniGLX is a subset of the usual Xlib and GLX APIs, programs written
+to the MiniGLX API can also be run on full Xlib/GLX implementations.
+This allows some degree of flexibility for software development and testing.
+</p>
+
+<p>
+However, the MiniGLX API is not binary-compatible with full Xlib/GLX.
+Some of the structures are different and some macros/functions work
+differently.
+See the <code>GL/miniglx.h</code> header file for details.
+</p>
+
+
+</body>
+</html>