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| The Mesa 3D Graphics Library |
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| <h1>Development Notes</h1> |
| |
| |
| <ul> |
| <li><a href="#extensions">Adding Extensions</a> |
| </ul> |
| |
| <h2 id="extensions">Adding Extensions</h2> |
| |
| <p> |
| To add a new GL extension to Mesa you have to do at least the following. |
| </p> |
| |
| <ul> |
| <li> |
| If <code>glext.h</code> doesn't define the extension, edit |
| <code>include/GL/gl.h</code> 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 <code>src/mapi/glapi/gen/</code> directory, add the new extension |
| functions and enums to the <code>gl_API.xml</code> 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 |
| <code>mtypes.h</code> if the extension requires driver capabilities not |
| already exposed by another extension. |
| </li> |
| <li> |
| Add a new entry to the <code>src/mesa/main/extensions_table.h</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 |
| <code>get.c</code>, <code>enable.c</code> and <code>attrib.c</code> |
| will most likely require new code. |
| </li> |
| <li> |
| To determine if the new extension is active in the current context, |
| use the auto-generated <code>_mesa_has_##name_str()</code> function |
| defined in <code>src/mesa/main/extensions.h</code>. |
| </li> |
| <li> |
| The dispatch tests <code>check_table.cpp</code> and |
| <code>dispatch_sanity.cpp</code> should be updated with details about |
| the new extensions functions. These tests are run using |
| <code>meson test</code>. |
| </li> |
| </ul> |
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