# Development Notes

## Adding Extentions

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

- If glext.h doesn't define the extension, edit include/GL/gl.h and add code like this:

           #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

- 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.
- Add a new entry to the `gl_extensions` struct in mtypes.h
- Update the `extensions.c` file.
- 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.
- If the new extension adds new GL state, the functions in get.c, enable.c and attrib.c will most likely require new code.

## 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;
    	}

Here's the GNU indent command which will best approximate my preferred style:

    	indent -br -i3 -npcs --no-tabs infile.c -o outfile.c

Local variable name example: localVarName (no underscores)

Constants and macros are ALL_UPPERCASE, with _ between words

Global variables are not allowed.

Function name examples:

    	glFooBar()       - a public GL entry point (in 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

## Making a New Mesa Release

These are the instructions for making a new Mesa release.

### Get latest source files

Use "cvs update -dAP " to get the latest Mesa files from CVS.

### Verify and update version info

Create/edit the docs/RELNOTES-X.Y file to document what's new in the release. Add the new RELNOTES-X.Y file to relnotes.html. Update the docs/VERSIONS file too.

Edit configs/default and change the MESA_MAJOR, MESA_MINOR and MESA_TINY version numbers.

Make sure the values in src/mesa/main/version.h is correct.

Edit the top-level Makefile and verify that DIRECTORY, LIB_NAME and DEMO_NAME are correct.

Update the docs/news.html file and docs/download.html files.

Check in all updates to CVS.

Tag the CVS files with the release name (in the form mesa_X_Y).

### Make the tarballs

Make a symbolic link from $(DIRECTORY) to 'Mesa'. For example, ln -s Mesa Mesa-6.3 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 tarballs

After the tarballs are created, the md5 checksums for the files will be computed. Add them to the docs/news.html file.

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

### Update the website and announce the release

Follow the directions on SourceForge for creating a new "release" and uploading the tarballs.

Update the web site by copying the docs/ directory's files to /home/users/b/br/brianp/mesa-www/htdocs/

Make an announcement on the mailing lists: mesa3d-dev@lists.sf.net, mesa3d-users@lists.sf.net and mesa3d-announce@lists.sf.net