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Using 3D Acceleration
DRI Users Guide
: Using 3D Acceleration
Previous: X Server Start-up
Next: General Trouble Shooting
6. Using 3D Acceleration
This section describes how to link your application with libGL.so
and verify that you are in fact using 3D acceleration.
6.1. libGL.so
Your OpenGL program must link with the libGL.so.1.2 library provided
by XFree86 4.0.
The libGL.so.1.2 library contains a GLX protocol encoder for
indirect/remote rendering and DRI code for accessing hardware
drivers.
In particular, be sure you're not using libGL.so from another
source such as Mesa or the Utah GLX project.
Unless it was built in a special way, the libGL.so library does
not contain any 3D hardware driver code.
Instead, libGL.so dynamically loads the appropriate 3D driver
during initialization.
Most simple OpenGL programs also use the GLUT and GLU libraries.
A source for these libraries is listed in the Resources
section below.
6.2. Compiling and linking an OpenGL program
A simple GLUT/OpenGL program may be compiled and linked as follows:
gcc program.c -I/usr/local/include -L/usr/local/lib -L/usr/X11R6/lib -lglut -lGLU -lGL -o program
The -I
option is used to specify where the GL/glut.h (and
possibly the GL/gl.h and GL/glu.h) header file may be found.
The -L
options specify where the libglut.so, libGLU.so and
X libraries are located.
The -lglut -lGLU -lGL
arguments specify that the application
should link with the GLUT, GLU and GL libraries.
6.3. Running your OpenGL program
Simply typing ./program in your shell should execute the program.
If you get an error message such as
gears: error in loading shared libraries: libGL.so.1: cannot
open shared object file: No such file or directory
if means that the libGL.so.1 file is not the right location.
Proceed to the trouble shooting section.
6.4. glxinfo
glxinfo is a useful program for checking which version of
libGL you're using as well as which DRI-based driver.
Simply type glxinfo
and examine the OpenGL vendor, renderer,
and version lines.
Among the output you should see something like this:
OpenGL vendor string: Precision Insight, Inc.
OpenGL renderer string: Mesa DRI Voodoo3 20000224
OpenGL version string: 1.2 Mesa 3.3 beta
or this:
OpenGL vendor string: Precision Insight, Inc.
OpenGL renderer string: Mesa GLX Indirect
OpenGL version string: 1.2 Mesa 3.3 beta
The first example indicates that the 3dfx driver is using
Voodoo3 hardware.
The second example indicates that no hardware driver was
found and indirect, unaccelerated rendering is being used.
If you see that indirect rendering is being used when direct
rendering was expected, proceed to the troubleshooting section.
glxinfo
also lists all of the GLX-enhanced visuals available.
Here you can determine which visuals may have depth buffers, stencil
buffers, accumulation buffers, etc.
6.5. Environment Variables
The libGL.so library recognizes three environment variables.
Normally, none of them need to be defined.
If you're using the csh or tcsh shells, type
setenv VARNAME value
to set the variable.
Otherwise, if you're using sh or bash, type
export VARNAME=value
.
LIBGL_DEBUG
, if defined will cause libGL.so to print error
and diagnostic messages. This can help to solve problems.
LIBGL_ALWAYS_INDIRECT
, if defined this will force libGL.so
to always use indirect rendering instead of hardware
acceleration.
This can be useful to isolate rendering errors.
LIBGL_DRIVERS_DIR
can be used to override the default
directory which is searched for 3D drivers.
In a typical XFree86 installation, the 3D drivers should be in
/usr/X11R6/lib/modules/dri/.
This environment variable can be used to specify a different
directory.
Note that this feature is disabled for set-uid programs.
Mesa-based drivers (this includes most of the drivers listed
above) also observe many of the existing Mesa environment variables.
These include the MESA_DEBUG
and MESA_INFO
variables.
DRI Users Guide
: Using 3D Acceleration
Previous: X Server Start-up
Next: General Trouble Shooting
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