

                      Information for Mesa developers


Adding Extentions
-----------------

To add a new GL extension to Mesa you have to do the following.

   Edit include/GL/gl.h and add
	- new enum tokens
	- new API function entry points
	- #define GL_EXT_the_extension_name 1

   If adding a new API function (call it glNewFunctionEXT):
	- insert glNewFunctionEXT()into src/apiext.h
	- edit src/types.h and add NewFunction to the gl_api_table struct
	- implement gl_NewFunction() in the appropriate src file
	- hook gl_NewFunction() into pointers.c
	- add display list support in dlist.c for save_NewFunction()
	- add glNewFunctionEXT to gl_GetProcAddress() in extensions.c or
	  in the device driver's GetProcAddress() function if appropriate

   If adding new GL state be sure to update get.c and enable.c

   Document the extension in the README file.  Either include a pointer
   to the extension spec or write an extension spec and put it in the
   Mesa/docs/ directory.



Coding Style
------------

Mesa's code style has changed over the years.  Here's the latest.

Comment your code!  It's extremely important that open-source code be
well documented.  Also, strive to write clean, easily understandable code.

3-space indentation

If you use tabs, set them to 8 columns

Brace example:

	if (condition) {
	   foo;
	}
	else {
	   bar;
	}

Local variable name example:  localVarName (no underscores)

Constants and macros are ALL UPPERCASE, with _ between words

Global vars not allowed.  Think very seriously before adding a new global!

Function name examples:
	glFooBar()    - a public GL entry point
	gl_FooBar()   - the internal immediate mode function
	save_FooBar() - retained mode (display list) function in dlist.c
	foo_bar()     - a static (private) function
	gl_foo_bar()  - an internal Mesa function



Writing a Device Driver
-----------------------

XXX to do

The src/ddsample.c file is really out of date so it's better to look
at the src/OSmesa or src/X driver code.



Making a New Mesa Release
-------------------------

These are the instructions for making a new Mesa release.

Be sure to do a "cvs update -d ." in the Mesa directory to
get all the latest files.

Update the version strings in src/get.c, src-glu/glu.c, and
src/X/fakeglx.c to return the new Mesa version number.

Edit the docs/RELNOTES file to document what's new in the release.
Edit the docs/VERSIONS file too.
Update the docs/IAFA-PACKAGE file.

Edit the GNU configure stuff to change versions numbers as needed:
Update the version string (second argument) in the line
"AM_INIT_AUTOMAKE(Mesa, 3.1b3)".
Remove the leading `dnl' from the line "dnl AM_MAINTAINER_MODE".
For both LIBGL_VERSION and LIBGLU_VERSION (libGL and libGLU version) do:
* If the library source code has changed at all since the last
  update, then increment REVISION (`C:R:A' becomes `C:R+1:A').
* If any interfaces have been added, removed, or changed since the
  last update, increment CURRENT, and set REVISION to 0.
* If any interfaces have been added since the last public release,
  then increment AGE.
* If any interfaces have been removed since the last public release,
  then set AGE to 0.

Run "fixam -f" to disable automatic dependency tracking.
Run the bootstrap script to generate the configure script.
(Requires autoconf 2.13 and automake 1.4, available from ftp.gnu.org)

Edit Make-config and change the MESA_MAJOR and/or MESA_MINOR versions.

Edit Makefile.X11 and verify DIRECTORY is set correctly.  The Mesa
sources must be in that directory (or there must be a symbolic link).

Edit Makefile.X11 and verify that LIB_NAME and DEMO_NAME are correct.
If it's a beta release, be sure the bump up the beta release number.

cp Makefile.X11 to Makefile so that the old-style Mesa makefiles
still work.  ./configure will overwrite it if that's what the user runs.

Make a symbolic link from $(DIRECTORY) to Mesa.  For example,
ln -s Mesa Mesa-3.1    This is needed in order to make a correct
tar file in the next step.

Make the distribution files.  From inside the Mesa directory:
	make -f Makefile.X11 lib_tar
	make -f Makefile.X11 demo_tar
	make -f Makefile.X11 lib_zip
	make -f Makefile.X11 demo_zip

Copy the distribution files to a temporary directory, unpack them,
compile everything, and run some demos to be sure everything works.

Upload the *.tar.gz and *.zip files to ftp.mesa3d.org

Update the web site.  CJ Beyer (cj@styx.phy.vanderbilt.edu) can
help with this and uploading to the ftp site.

Make the announcement to mesa-dev@mesa3d.org, mesa@iqm.unicamp.br,
mesa-announce@iqm.unicamp.br and other sites.


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$Id: DEVINFO,v 1.7.2.1 2000/04/24 14:48:19 brianp Exp $
