Linux Graphics
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Another Potential CPU Optimization For Mesa: Quadratic Probing
Mesa developer Thomas Helland is looking at reviving an old set of Mesa patches that could help out in some CPU-bound scenarios.
Helland re-discovered some old Mesa patches from April 2015 for implementing quadratic probing in hash tables for being faster rather than the linear re-probing hash table as is used currently. Helland explained further in the patch, "This will allow us to remove the large static table and use a power of two hash table size that we can compute on the fly. We can use bitmasking instead of modulo to fit our hash in the table, and it's less code. By using the algorithm hash = sh + i/2 + i*i/2 we are guaranteed that all retries from the quad probing are distinct, and so we should be able to completely fill the table."
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Libinput X.Org Driver Updated With New Capabilities
Libinput is the input handling library that originated with Wayland but has since been adopted by Mir as well as X.Org when using the xf86-input-libinput handling driver. This xf86-input-libinput adaptation for X.Org Servers has seen a new release today.
Last month marked the libinput 1.6 release with new features to the input library. Now xf86-input-libinput has been upgraded for improving the support for this generic input handling implementation on xorg-server systems.
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RadeonSI Working Toward Better Rocket League Performance
Marek Olšák has posted a set of patches today to the Mesa mailing list and they should help some Linux games, at least Rocket League.
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Wayland's Weston 2.0 Beta Released
One day after the Wayland 1.13 Beta, the reference Weston compositor is updated to its 2.0 beta state.
Wayland's reference compositor, Weston, is moving to version 2.0 rather than version 1.13 since its new output configuration ABI has broken Weston's ABI. In addition to the new output handling API, Weston 2.0 has seen work on DRM compositor improvements, support for using EGL_KHR_swap_buffers_with_damage, initial window positioning for XWayland apps, desktop shell refinements, and other improvements.
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