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638b22354e
Flushing the batch midframe (splitting a renderpass) is expensive on a tiler, as
it requires the GPU to flush the framebuffer contents to main memory and read
them back. Clearing the framebuffer should not trigger a flush. Apps expect
clears to be (almost) free, flushing for a clear is at the very least unexpected
behaviour.
The only reason we previously flushed is to ensure we could always use a "fast"
clear. But a slow clear is a heck of a lot faster than a flush ;-) Instead of
flushing, we should clear with a draw (via u_blitter) in case a fast clear isn't
possible.
This fixes pathological performance for applications that rely on partial clears
within a frame. This issue was identified with Inochi2D, which repeatedly clears
the stencil buffer midframe, in order to implement masking efficiently with the
stencil buffer. In total, the all-important workload of rendering Asahi Lina is
improved from 17fps to 29fps on a panfrost device.
Fixes:
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| .github/workflows | ||
| .gitlab/issue_templates | ||
| .gitlab-ci | ||
| android | ||
| bin | ||
| build-support | ||
| docs | ||
| include | ||
| src | ||
| subprojects | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .mailmap | ||
| CODEOWNERS | ||
| meson.build | ||
| meson_options.txt | ||
| 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.