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Graphics: AMD, KWinFT and Zink

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Graphics/Benchmarks
  • AMD Sends Out Linux Kernel Support For Van Gogh APUs - Confirms DDR5 Memory, VCN3

    s a nice Friday afternoon patch series there is the 275k lines of code for wiring up the next-generation AMD Van Gogh APU support under Linux.

    Earlier this week there were the Mesa patches for AMD Dimgrey Cavefish and Van Gogh while today the kernel-side portion for Van Gogh was sent out for the AMDGPU kernel driver.

  • AMD Van Gogh APUs Spotted In Linux Patch, Features DDR5, Navi 2 iGPU

    AMD submitted the 45 Linux kernel patches, which weigh in at 275,000 lines of code, to enable Linux support for the coming APUs. The patches also reveal that Van Gogh comes with Video Core Next 3.0, which supports AV1 decode. In the past, Phoronix has found patches indicating VCN 3.0 (video encode) is native to the Navi 2 graphics engine.

    Pairing the Navi 2 / RDNA 2 graphics engine with DDR5/LPDDR5 could unlock quite a bit of graphical horsepower, as integrated graphics engines tend to respond well to increased memory throughput. Van Gogh is also predicted to come with Zen 2 cores, and it will certainly be interesting to see what kind of impact the improved memory throughput has on the Zen 2 architecture.

  • Roman Gilg: Universal means to specific ends

    Today new beta versions for all KWinFT projects – that are KWinFT, Wrapland, Disman and KDisplay – were released. With that we are on target for the full release which is aligned with Plasma 5.20 on October 13.

    Big changes will unquestionable come to Disman, a previously stifled library for display management, which now learns to stand on its own feet providing universal means for the configuration of displays with different windowing systems and Wayland compositors.

    But also for the compositor KWinFT a very specific yet important feature got implemented and a multitude of stability fixes and code refactors were accomplished.

    In the following we will do a deep dive into reasons and results of this recent efforts.

  • Mike Blumenkrantz: Engage Thrusters

    Briefly, zink copies the framebuffer state, there’s a number of conditions under which a new pipeline object is needed, which all result in ctx->gfx_pipeline_state.hash = 0;. Other than this, there’s sample count check for sample changes so that the shader can be modified if necessary, and then there’s the setup for creating the Vulkan framebuffer object as well as the renderpass object in get_framebuffer().

    Eagle-eyed readers will immediately spot the problem here, which is, aside from the fact that there’s not actually any reason to be setting up the framebuffer or renderpass here, how zink is also flushing the current batch if a renderpass is active.

    The change I made here was to remove everything related to Vulkan from here, and move it to zink_begin_render_pass(), which is the function that the driver uses to begin a renderpass for a given batch.

KWinFT Projects Hit Beta Ahead Of Stable Releases Aligned...

  • KWinFT Projects Hit Beta Ahead Of Stable Releases Aligned With KDE Plasma 5.20

    KWinFT as a fork of KDE's KWin focused on better Wayland support and other modernization efforts is approaching its first stable release next month around the same time as KDE Plasma 5.20.

    While KWinFT started out as a fork of just KWin, it expanded earlier this year to also including Wrapland and Disman as other libraries to help this KDE display/presentation modernization effort. All of these KWinFT projects on Friday saw their first beta release. This also happens to come just days after the recent Disman presentation at XDC2020.

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