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281 lines
7.0 KiB
HTML
281 lines
7.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<title>Development Notes</title>
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<link rel="stylesheet" type="text/css" href="mesa.css">
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</head>
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<body>
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<div class="header">
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<h1>The Mesa 3D Graphics Library</h1>
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</div>
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<iframe src="contents.html"></iframe>
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<div class="content">
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<h1>Development Notes</h1>
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<h2>Adding Extentions</h2>
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<p>
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To add a new GL extension to Mesa you have to do at least the following.
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<ul>
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<li>
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If glext.h doesn't define the extension, edit include/GL/gl.h and add
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code like this:
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<pre>
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#ifndef GL_EXT_the_extension_name
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#define GL_EXT_the_extension_name 1
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/* declare the new enum tokens */
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/* prototype the new functions */
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/* TYPEDEFS for the new functions */
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#endif
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</pre>
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</li>
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<li>
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In the src/mesa/glapi/ directory, add the new extension functions and
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enums to the gl_API.xml file.
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Then, a bunch of source files must be regenerated by executing the
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corresponding Python scripts.
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</li>
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<li>
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Add a new entry to the <code>gl_extensions</code> struct in mtypes.h
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</li>
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<li>
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Update the <code>extensions.c</code> file.
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</li>
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<li>
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From this point, the best way to proceed is to find another extension,
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similar to the new one, that's already implemented in Mesa and use it
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as an example.
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</li>
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<li>
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If the new extension adds new GL state, the functions in get.c, enable.c
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and attrib.c will most likely require new code.
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</li>
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</ul>
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<h2>Coding Style</h2>
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<p>
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Mesa's code style has changed over the years. Here's the latest.
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</p>
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<p>
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Comment your code! It's extremely important that open-source code be
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well documented. Also, strive to write clean, easily understandable code.
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</p>
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<p>
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3-space indentation
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</p>
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<p>
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If you use tabs, set them to 8 columns
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</p>
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<p>
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Line width: the preferred width to fill comments and code in Mesa is 78
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columns. Exceptions are sometimes made for clarity (e.g. tabular data is
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sometimes filled to a much larger width so that extraneous carriage returns
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don't obscure the table).
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</p>
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<p>
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Brace example:
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</p>
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<pre>
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if (condition) {
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foo;
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}
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else {
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bar;
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}
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switch (condition) {
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case 0:
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foo();
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break;
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case 1: {
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...
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break;
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}
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default:
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...
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break;
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}
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</pre>
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<p>
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Here's the GNU indent command which will best approximate my preferred style:
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(Note that it won't format switch statements in the preferred way)
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</p>
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<pre>
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indent -br -i3 -npcs --no-tabs infile.c -o outfile.c
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</pre>
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<p>
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Local variable name example: localVarName (no underscores)
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</p>
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<p>
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Constants and macros are ALL_UPPERCASE, with _ between words
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</p>
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<p>
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Global variables are not allowed.
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</p>
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<p>
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Function name examples:
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</p>
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<pre>
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glFooBar() - a public GL entry point (in glapi_dispatch.c)
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_mesa_FooBar() - the internal immediate mode function
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save_FooBar() - retained mode (display list) function in dlist.c
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foo_bar() - a static (private) function
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_mesa_foo_bar() - an internal non-static Mesa function
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</pre>
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<p>
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Places that are not directly visible to the GL API should prefer the use
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of <tt>bool</tt>, <tt>true</tt>, and
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<tt>false</tt> over <tt>GLboolean</tt>, <tt>GL_TRUE</tt>, and
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<tt>GL_FALSE</tt>. In C code, this may mean that
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<tt>#include <stdbool.h></tt> needs to be added. The
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<tt>try_emit_</tt>* methods in src/mesa/program/ir_to_mesa.cpp and
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src/mesa/state_tracker/st_glsl_to_tgsi.cpp can serve as examples.
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</p>
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<h2>Marking a commit as a candidate for a stable branch</h2>
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<p>
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If you want a commit to be applied to a stable branch,
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you should add an appropriate note to the commit message.
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</p>
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<p>
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Here are some examples of such a note:
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</p>
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<ul>
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<li>NOTE: This is a candidate for the 9.0 branch.</li>
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<li>NOTE: This is a candidate for the 8.0 and 9.0 branches.</li>
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<li>NOTE: This is a candidate for the stable branches.</li>
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</ul>
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<h2>Cherry-picking candidates for a stable branch</h2>
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<p>
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Please use <code>git cherry-pick -x <commit></code> for cherry-picking a commit
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from master to a stable branch.
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</p>
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<h2>Making a New Mesa Release</h2>
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<p>
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These are the instructions for making a new Mesa release.
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</p>
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<h3>Get latest source files</h3>
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<p>
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Use git to get the latest Mesa files from the git repository, from whatever
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branch is relevant.
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</p>
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<h3>Verify and update version info</h3>
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<dl>
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<dt>SConstruct</dt>
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<dt>Android.common.mk</dt>
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<dd>PACKAGE_VERSION</dd>
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<dt>configure.ac</dt>
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<dd>AC_INIT</dd>
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</dl>
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<p>
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Create a docs/relnotes/x.y.z.html file.
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The bin/bugzilla_mesa.sh and bin/shortlog_mesa.sh scripts can be used to
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create the HTML-formatted lists of bugfixes and changes to include in the file.
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Link the new docs/relnotes/x.y.z.html file into the main <a href="relnotes.html">relnotes.html</a> file.
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</p>
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<p>
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Update <a href="index.html">docs/index.html</a>.
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</p>
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<p>
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Tag the files with the release name (in the form <b>mesa-x.y</b>)
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with: <code>git tag -s mesa-x.y -m "Mesa x.y Release"</code>
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Then: <code>git push origin mesa-x.y</code>
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</p>
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<h3>Make the tarballs</h3>
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<p>
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Make the distribution files. From inside the Mesa directory:
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<pre>
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./autogen.sh
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make tarballs
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</pre>
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<p>
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After the tarballs are created, the md5 checksums for the files will
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be computed.
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Add them to the docs/relnotes/x.y.html file.
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</p>
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<p>
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Copy the distribution files to a temporary directory, unpack them,
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compile everything, and run some demos to be sure everything works.
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</p>
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<h3>Update the website and announce the release</h3>
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<p>
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Make a new directory for the release on annarchy.freedesktop.org with:
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<br>
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<code>
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mkdir /srv/ftp.freedesktop.org/pub/mesa/x.y
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</code>
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</p>
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<p>
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Basically, to upload the tarball files with:
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<br>
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<code>
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rsync -avP -e ssh MesaLib-x.y.* USERNAME@annarchy.freedesktop.org:/srv/ftp.freedesktop.org/pub/mesa/x.y/
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</code>
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</p>
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<p>
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Update the web site by copying the docs/ directory's files to
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/home/users/b/br/brianp/mesa-www/htdocs/ with:
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<br>
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<code>
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sftp USERNAME,mesa3d@web.sourceforge.net
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</code>
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</p>
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<p>
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Make an announcement on the mailing lists:
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<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>,
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<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>
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and
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<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>
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</p>
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</div>
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</body>
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</html>
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