Commit e58a10af authored by Brian Paul's avatar Brian Paul
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Mesa 3.0 Unix/X11 Information
To compile the library, first type 'make' alone to see the list of system
configurations currently supported. If you see your configuration on the
list, type 'make <config>'. Most popular Unix/X workstations are currently
The top-level makefile will execute the makefiles in a number of sub-
directories. When finished, the Mesa libraries will be in the Mesa-2.6/lib/
directory. A few GLUT demos in the demos/ directory should be ready to run.
If you also downloaded and unpacked the demos there should be executables
in the "xdemos/", "samples/", and "book/" directories for you to try out.
If you only want to compile the contents of one subdirectory you can 'cd'
to that directory and type 'make <config>' there.
If your system configuration is not listed by 'make', you'll have to modify
the top-level Makefile and Make-config files. There are instructions in
each file.
If you have compilation problems you should try to fix them and return the
patches to the author.
Header and library files:
After you've compiled Mesa and tried the demos I recommend the following
procedure for "installing" Mesa.
Copy the Mesa include/GL directory to /usr/local/include:
cp -r include/GL /usr/local/include
Copy the Mesa library files to /usr/local/lib:
cp lib/* /usr/local/lib
(actually, use "cp -d" on Linux to preserve symbolic links)
Create a few symbolic links so that compiling OpenGL applications is easy:
cd /usr/local/lib
ln -s libMesaGL.a libGL.a
ln -s libMesaGLU.a libGLU.a
ln -s
ln -s
Xt/Motif widgets:
If you want to use Mesa or OpenGL in your Xt/Motif program you can build
the widgets found in either the widgets-mesa or widgets-sgi directories.
The former were written for Mesa and the later are the original SGI
widgets. Look in those directories for more information.
HP users: a Mesa user reports that the HP-UX 10.01 C compiler has
a bug which effects glReadPixels. A patch for the compiler (PHSS_5743) is
available. Otherwise be sure your compiler is version 10.13 or later.
QNX users: if you have problems running the demos try setting the
stack size to 200K or larger with -N200K, for example.
SunOS 5.x users: The X shared memory extension may not work
correctly. If Mesa prints an error message to the effect of "Shared memory
error" then you'll have to append the following three lines to the end of
your /etc/system file then reboot:
set shmsys:shminfo_shmmax = 0x2000000
set shmsys:shminfo_shmmni = 0x1000
set shmsys:shminfo_shmseg = 0x100
Using the library
Configuration options:
The file src/config.h has many parameters which you can adjust such
as maximum number of lights, clipping planes, maximum texture size,
etc. In particular, you may want to change DEPTH_BITS from 16 to 32
if a 16-bit depth buffer isn't precise enough for your application.
Shared libraries:
If you compile shared libraries you may have to set an environment
variable to specify where the Mesa libraries are located. On Linux and
Sun systems for example, set the LD_LIBRARY_PATH variable to include
/your-dir/Mesa-2.6/lib. Otherwise, when you try to run a demo it
may fail with a message saying that one or more libraries couldn't be
Remote display of OpenGL/GLX programs:
As of version 1.2.3, Mesa's header files use the same GLenum and GLUenum
values as SGI's (and most/all other vendor's) OpenGL headers. This means
you can freely mix object files compiled with OpenGL or Mesa headers.
In fact, on systems with dynamic runtime linkers it's possible to dynam-
ically link with Mesa or OpenGL shared libraries at runtime, without
recompiling or relinking anything!
Using IRIX 5.x as an example, you can run SGI's OpenGL demos with the
Mesa shared libraries as follows. Let's assume you're installing Mesa
in /usr/local/Mesa and using the C-shell:
% cd /usr/local/Mesa
% make irix5-dso
% cd lib
% ln -s
% setenv _RLD_LIST "/usr/local/Mesa/lib/"
% /usr/demos/bin/ideas_ogl // this is a test
You can now run OpenGL executables on almost any X display! There may
be some problems from the fact that Mesa supports many X visual types
that an OpenGL client may not expect (grayscale for example). In this
case the application may abort, print error messages, or just behave
strangely. You may have to experiment with the MESA_RGB_VISUAL envi-
ronment variable.
Xt/Motif Widgets:
Two versions of the Xt/Motif OpenGL drawing area widgets are included:
widgets-sgi/ SGI's stock widgets
widgets-mesa/ Mesa-tuned widgets
Look in those directories for details
Togl is an OpenGL/Mesa widget for Tcl/Tk.
See for more information.
X Display Modes:
Mesa supports RGB(A) rendering into almost any X visual type and depth.
The glXChooseVisual function tries its best to pick an appropriate visual
for the given attribute list. However, if this doesn't suit your needs
you can force Mesa to use any X visual you want (any supported by your
X server that is) by setting the MESA_RGB_VISUAL and MESA_CI_VISUAL
environment variables. When an RGB visual is requested, glXChooseVisual
will first look if the MESA_RGB_VISUAL variable is defined. If so, it
will try to use the specified visual. Similarly, when a color index
visual is requested, glXChooseVisual will look for the MESA_CI_VISUAL
The format of accepted values is: <visual-class> <depth>
Here are some examples:
using the C-shell:
% setenv MESA_RGB_VISUAL "TrueColor 8" // 8-bit TrueColor
% setenv MESA_CI_VISUAL "PseudoColor 12" // 12-bit PseudoColor
% setenv MESA_RGB_VISUAL "PseudoColor 8" // 8-bit PseudoColor
using the KornShell:
$ export MESA_RGB_VISUAL="TrueColor 8"
$ export MESA_CI_VISUAL="PseudoColor 12"
$ export MESA_RGB_VISUAL="PseudoColor 8"
Double buffering (X11 only):
Mesa can use either an X Pixmap or XImage as the backbuffer when in
double buffer mode. Using GLX, the default is to use an XImage. The
MESA_BACK_BUFFER environment variable can override this. The valid
values for MESA_BACK_BUFFER are: Pixmap and XImage (only the first
letter is checked, case doesn't matter).
A pixmap is faster when drawing simple lines and polygons while an
XImage is faster when Mesa has to do pixel-by-pixel rendering. If you
need depth buffering the XImage will almost surely be faster. Exper-
iment with the MESA_BACK_BUFFER variable to see which is faster for
your application.
Colormaps (X11 only):
When using Mesa directly or with GLX, it's up to the application writer
to create a window with an appropriate colormap. The aux, tk, and GLUT
toolkits try to minimize colormap "flashing" by sharing colormaps when
possible. Specifically, if the visual and depth of the window matches
that of the root window, the root window's colormap will be shared by
the Mesa window. Otherwise, a new, private colormap will be allocated.
When sharing the root colormap, Mesa may be unable to allocate the colors
it needs, resulting in poor color quality. This can happen when a
large number of colorcells in the root colormap are already allocated.
To prevent colormap sharing in aux, tk and GLUT, define the environment
variable MESA_PRIVATE_CMAP. The value isn't significant.
Gamma correction (X11 only):
To compensate for the nonlinear relationship between pixel values
and displayed intensities, there is a gamma correction feature in
Mesa. Some systems, such as Silicon Graphics, support gamma
correction in hardware (man gamma) so you won't need to use Mesa's
gamma facility. Other systems, however, may need gamma adjustment
to produce images which look correct. If in the past you thought
Mesa's images were too dim, read on.
Gamma correction is controlled with the MESA_GAMMA environment
variable. Its value is of the form "Gr Gg Gb" or just "G" where
Gr is the red gamma value, Gg is the green gamma value, Gb is the
blue gamma value and G is one gamma value to use for all three
channels. Each value is a positive real number typically in the
range 1.0 to 2.5. The defaults are all 1.0, effectively disabling
gamma correction. Examples using csh:
% setenv MESA_GAMMA "2.3 2.2 2.4" // separate R,G,B values
% setenv MESA_GAMMA "2.0" // same gamma for R,G,B
The demos/gamma.c program may help you to determine reasonable gamma
value for your display. With correct gamma values, the color intensities
displayed in the top row (drawn by dithering) should nearly match those
in the bottom row (drawn as grays).
Alex De Bruyn reports that gamma values of 1.6, 1.6 and 1.9 work well
on HP displays using the HP-ColorRecovery technology.
Mesa implements gamma correction with a lookup table which translates
a "linear" pixel value to a gamma-corrected pixel value. There is a
small performance penalty. Gamma correction only works in RGB mode.
Also be aware that pixel values read back from the frame buffer will
not be "un-corrected" so glReadPixels may not return the same data
drawn with glDrawPixels.
For more information about gamma correction see:
The following OpenGL GLX extensions are currently implemented:
GLX_EXT_visual_info - GLX visual and transparent pixel extension
For detailed information about the extensions see
There are four Mesa-specific GL/GLX extensions at this time.
This extension adds the GLX function:
GLXPixmap glXCreateGLXPixmapMESA( Display *dpy, XVisualInfo *visual,
Pixmap pixmap, Colormap cmap )
It is an alternative to the standard glXCreateGLXPixmap() function.
Since Mesa supports RGB rendering into any X visual, not just True-
Color or DirectColor, Mesa needs colormap information to convert RGB
values into pixel values. An X window carries this information but a
pixmap does not. This function associates a colormap to a GLX pixmap.
See the xdemos/glxpixmap.c file for an example of how to use this
Mesa associates a set of ancillary (depth, accumulation, stencil and
alpha) buffers with each X window it draws into. These ancillary
buffers are allocated for each X window the first time the X window
is passed to glXMakeCurrent(). Mesa, however, can't detect when an
X window has been destroyed in order to free the ancillary buffers.
The best it can do is to check for recently destroyed windows whenever
the client calls the glXCreateContext() or glXDestroyContext()
functions. This may not be sufficient in all situations though.
The GLX_MESA_release_buffers extension allows a client to explicitly
deallocate the ancillary buffers by calling glxReleaseBuffersMESA()
just before an X window is destroyed. For example:
#ifdef GLX_MESA_release_buffers
glXReleaseBuffersMESA( dpy, window );
XDestroyWindow( dpy, window );
This extension is new in Mesa 2.0.
This extension adds the glXCopySubBufferMESA() function. It works
like glXSwapBuffers() but only copies a sub-region of the window
instead of the whole window.
This extension is new in Mesa version 2.6
Summary of X-related environment variables:
MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode (X only)
MESA_CI_VISUAL - specifies the X visual and depth for CI mode (X only)
MESA_BACK_BUFFER - specifies how to implement the back color buffer (X only)
MESA_PRIVATE_CMAP - force aux/tk libraries to use private colormaps (X only)
MESA_GAMMA - gamma correction coefficients (X only)
$Id: README.X11,v 3.0 1998/02/14 17:45:13 brianp Exp $
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