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An "augmented tree" is a tree with extra data attached which flows from the leaves to the root. An "interval tree" is a datastructure of (potentially-overlapping) intervals where, in addition to inserting and removing intervals, we can quickly lookup all the intervals which overlap a given interval. After describing red-black trees, CLRS explains how it's possible to implement an interval tree using an augmented red-black tree where the nodes are ordered by interval start and each node also stores the maximum interval end for its entire subtree. Implement the interval tree extension described by CLRS. Iterating over all overlapping intervals is actually an exercise, so we have to solve the exercise. The recursive solution has been re-written to use the parent pointers to avoid needing a stack, similarly to rb_tree_first() and rb_node_next(). For now, we only implement unsigned intervals, but the core algorithms are all abstracted to allow other types. There's still some boilerplate, but it's the best that can be done in C. Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22071>
`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library ====================================================== Source ------ This repository lives at https://gitlab.freedesktop.org/mesa/mesa. Other repositories are likely forks, and code found there is not supported. Build & install --------------- You can find more information in our documentation (`docs/install.rst <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://mesa3d.org/meson.html>`_): .. code-block:: sh $ mkdir build $ cd build $ meson .. $ sudo ninja install Support ------- Many Mesa devs hang on IRC; if you're not sure which channel is appropriate, you should ask your question on `OFTC's #dri-devel <irc://irc.oftc.net/dri-devel>`_, someone will redirect you if necessary. Remember that not everyone is in the same timezone as you, so it might take a while before someone qualified sees your question. To figure out who you're talking to, or which nick to ping for your question, check out `Who's Who on IRC <https://dri.freedesktop.org/wiki/WhosWho/>`_. The next best option is to ask your question in an email to the mailing lists: `mesa-dev\@lists.freedesktop.org <https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_ Bug reports ----------- If you think something isn't working properly, please file a bug report (`docs/bugs.rst <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.