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  11   The Mesa 3D Graphics Library
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  17 <h1>Development Notes</h1>
  18
  19
  20 <ul>
  21 <li><a href="#extensions">Adding Extensions</a>
  22 </ul>
  23
  24 <h2 id="extensions">Adding Extensions</h2>
  25
  26 <p>
  27 To add a new GL extension to Mesa you have to do at least the following.
  28 </p>
  29
  30 <ul>
  31 <li>
  32    If <code>glext.h</code> doesn't define the extension, edit
  33    <code>include/GL/gl.h</code> and add code like this:
  34    <pre>
  35      #ifndef GL_EXT_the_extension_name
  36      #define GL_EXT_the_extension_name 1
  37      /* declare the new enum tokens */
  38      /* prototype the new functions */
  39      /* TYPEDEFS for the new functions */
  40      #endif
  41    </pre>
  42 </li>
  43 <li>
  44    In the <code>src/mapi/glapi/gen/</code> directory, add the new extension
  45    functions and enums to the <code>gl_API.xml</code> file.
  46    Then, a bunch of source files must be regenerated by executing the
  47    corresponding Python scripts.
  48 </li>
  49 <li>
  50    Add a new entry to the <code>gl_extensions</code> struct in
  51    <code>mtypes.h</code> if the extension requires driver capabilities not
  52    already exposed by another extension.
  53 </li>
  54 <li>
  55    Add a new entry to the <code>src/mesa/main/extensions_table.h</code> file.
  56 </li>
  57 <li>
  58    From this point, the best way to proceed is to find another extension,
  59    similar to the new one, that's already implemented in Mesa and use it
  60    as an example.
  61 </li>
  62 <li>
  63    If the new extension adds new GL state, the functions in get.c, enable.c
  64    and attrib.c will most likely require new code.
  65 </li>
  66 <li>
  67    To determine if the new extension is active in the current context,
  68    use the auto-generated <code>_mesa_has_##name_str()</code> function
  69    defined in <code>src/mesa/main/extensions.h</code>.
  70 </li>
  71 <li>
  72    The dispatch tests check_table.cpp and <code>dispatch_sanity.cpp</code>
  73    should be updated with details about the new extensions functions. These
  74    tests are run using <code>meson test</code>.
  75 </li>
  76 </ul>
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