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Development Notes
=================
Adding Extensions
-----------------
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:
.. code-block:: c
#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/mapi/glapi/gen/`` 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 ``consts_exts.h`` if
the extension requires driver capabilities not already exposed by
another extension.
- Add a new entry to the ``src/mesa/main/extensions_table.h`` 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.
- To determine if the new extension is active in the current context,
use the auto-generated ``_mesa_has_##name_str()`` function defined in
``src/mesa/main/extensions.h``.
- The dispatch tests ``check_table.cpp`` and ``dispatch_sanity.cpp``
should be updated with details about the new extensions functions.
These tests are run using ``meson test``.
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