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e749f67f89
When lower_wpos_pntc is used, the state tracker inserts code to transform gl_PointCoord.y according to a uniform, to account for API-requested point coordinate origin and framebuffer orientation. With the transformation, driver-supplied point coordinates are expected to have an upper left origin. If the hardware point coordinate supports (only) a lower left origin, the backend has to use lower_wpos_pntc and then lower *again* to flip back. This ends up transforming twice, which is wasteful: a = load point coord Y with lower left origin a' = 1.0 - a a'' = uniform_transform(a') However, lower_wpos_pntc is quite capable of transforming for a lower left origin too, it just needs to flip the transformation. Add a CAP specifying the point coordinate origin convention, rather than assuming upper-left. This simplifies the Asahi code greatly. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com> Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16829> |
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| README.rst | ||
| VERSION | ||
`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.