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<h1>Development Notes</h1>


<h2>Adding Extentions</h2>

<p>
To add a new GL extension to Mesa you have to do at least the following.

<ul>
<li>
   If glext.h doesn't define the extension, edit include/GL/gl.h and add
   code like this:
   <pre>
     #ifndef GL_EXT_the_extension_name
     #define GL_EXT_the_extension_name 1
     /* declare the new enum tokens */
     /* prototype the new functions */
     /* TYPEDEFS for the new functions */
     #endif
   </pre>
</li>
<li>
   In the src/mesa/glapi/ directory, add the new extension functions and
   enums to the gl_API.xml file.
   Then, a bunch of source files must be regenerated by executing the
   corresponding Python scripts.
</li>
<li>
   Add a new entry to the <code>gl_extensions</code> struct in mtypes.h
</li>
<li>
   Update the <code>extensions.c</code> file.
</li>
<li>
   From this point, the best way to proceed is to find another extension,
   similar to the new one, that's already implemented in Mesa and use it
   as an example.
</li>
<li>
   If the new extension adds new GL state, the functions in get.c, enable.c
   and attrib.c will most likely require new code.
</li>
</ul>


<h2>Coding Style</h2>

<p>
Mesa's code style has changed over the years.  Here's the latest.
</p>

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

<p>
3-space indentation
</p>

<p>
If you use tabs, set them to 8 columns
</p>

<p>
Line width: the preferred width to fill comments and code in Mesa is 78
columns.  Exceptions are sometimes made for clarity (e.g. tabular data is
sometimes filled to a much larger width so that extraneous carriage returns
don't obscure the table).
</p>

<p>
Brace example:
</p>
<pre>
	if (condition) {
	   foo;
	}
	else {
	   bar;
	}

	switch (condition) {
	case 0:
	   foo();
	   break;

	case 1: {
	   ...
	   break;
	}

	default:
	   ...
	   break;
	}
</pre>

<p>
Here's the GNU indent command which will best approximate my preferred style:
(Note that it won't format switch statements in the preferred way)
</p>
<pre>
	indent -br -i3 -npcs --no-tabs infile.c -o outfile.c
</pre>


<p>
Local variable name example:  localVarName (no underscores)
</p>

<p>
Constants and macros are ALL_UPPERCASE, with _ between words
</p>

<p>
Global variables are not allowed.
</p>

<p>
Function name examples:
</p>
<pre>
	glFooBar()       - a public GL entry point (in glapi_dispatch.c)
	_mesa_FooBar()   - the internal immediate mode function
	save_FooBar()    - retained mode (display list) function in dlist.c
	foo_bar()        - a static (private) function
	_mesa_foo_bar()  - an internal non-static Mesa function
</pre>

<p>
Places that are not directly visible to the GL API should prefer the use
of <tt>bool</tt>, <tt>true</tt>, and
<tt>false</tt> over <tt>GLboolean</tt>, <tt>GL_TRUE</tt>, and
<tt>GL_FALSE</tt>.  In C code, this may mean that
<tt>#include &lt;stdbool.h&gt;</tt> needs to be added.  The
<tt>try_emit_</tt>* methods in src/mesa/program/ir_to_mesa.cpp and
src/mesa/state_tracker/st_glsl_to_tgsi.cpp can serve as examples.
</p>


<h2>Making a New Mesa Release</h2>

<p>
These are the instructions for making a new Mesa release.
</p>

<h3>Get latest source files</h3>
<p>
Use git to get the latest Mesa files from the git repository, from whatever
branch is relevant.
</p>


<h3>Verify and update version info</h3>
<p>
Create/edit the docs/relnotes-x.y.html file to document what's new in the release.
Add the new relnotes-x.y.html file to <a href="relnotes.html">relnotes.html</a>.
</p>

<p>
Update the MESA_MAJOR, MESA_MINOR and MESA_TINY version numbers in
configs/default.
Also update the VERSION line in the top-level Makefile.
</p>

<p>
Make sure the values in src/mesa/main/version.h are correct.
</p>

<p>
Update docs/news.html.
</p>

<p>
Create a docs/relnotes-x.y.z.html file.
The bin/shortlog_mesa.sh script can be used to create a HTML-formatted list
of changes to include in the file.
Link the new docs/relnotes-x.y.z.html file into the main relnotes.html file.
</p>

<p>
Tag the files with the release name (in the form <b>mesa_X_Y</b>)
with: <code>git tag -a mesa_X_Y</code>
Then: <code>git push origin mesa_X_Y</code>
</p>


<h3>Make the tarballs</h3>
<p>
Make the distribution files.  From inside the Mesa directory:
<pre>
	make tarballs
</pre>

<p>
After the tarballs are created, the md5 checksums for the files will
be computed.
Add them to the docs/relnotes-X.Y.html file.
</p>

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

<h3>Update the website and announce the release</h3>
<p>
Follow the directions on SourceForge for creating a new "release" and
uploading the tarballs.
</p>

<p>
Basically, to upload the tarball files with:
<br>
<code>
rsync -avP ssh Mesa*-X.Y.* USERNAME@frs.sourceforge.net:uploads/
</code>
</p>

<p>
Update the web site by copying the docs/ directory's files to
/home/users/b/br/brianp/mesa-www/htdocs/ with:
<br>
<code>
sftp USERNAME,mesa3d@web.sourceforge.net
</code>
</p>

<p>
Make an announcement on the mailing lists:

<em>m</em><em>e</em><em>s</em><em>a</em><em>-</em><em>d</em><em>e</em><em>v</em><em>@</em><em>l</em><em>i</em><em>s</em><em>t</em><em>s</em><em>.</em><em>f</em><em>r</em><em>e</em><em>e</em><em>d</em><em>e</em><em>s</em><em>k</em><em>t</em><em>o</em><em>p</em><em>.</em><em>o</em><em>r</em><em>g</em>,
<em>m</em><em>e</em><em>s</em><em>a</em><em>-</em><em>u</em><em>s</em><em>e</em><em>r</em><em>s</em><em>@</em><em>l</em><em>i</em><em>s</em><em>t</em><em>s</em><em>.</em><em>f</em><em>r</em><em>e</em><em>e</em><em>d</em><em>e</em><em>s</em><em>k</em><em>t</em><em>o</em><em>p</em><em>.</em><em>o</em><em>r</em><em>g</em>
and
<em>m</em><em>e</em><em>s</em><em>a</em><em>-</em><em>a</em><em>n</em><em>n</em><em>o</em><em>u</em><em>n</em><em>c</em><em>e</em><em>@</em><em>l</em><em>i</em><em>s</em><em>t</em><em>s</em><em>.</em><em>f</em><em>r</em><em>e</em><em>e</em><em>d</em><em>e</em><em>s</em><em>k</em><em>t</em><em>o</em><em>p</em><em>.</em><em>o</em><em>r</em><em>g</em>
</p>

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