Linux Graphics News
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Vulkan 1.0.54 Lands In Mesa For Intel ANV, Some RADV Extensions
It's fabulous to see how promptly the Mesa Vulkan drivers are receiving support for new extensions.
Vulkan 1.0.54 was released on Thursday. This updated promoted the external memory and semaphores extensions from experimental to stable. They also added new extensions for 16-bit storage, dedicated allocation, storage buffer storage class, variable pointers, new memory requirements query, and external fences for external memory.
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Difficulties and Success Stories
This hints to a fundamental issue with our approach of using the Present extension in Xwayland. The extension was written with hardware in mind. It assumes a flip happens directly on a screen. There is no intermediate link like a Wayland compositor and if a flip has happened the old buffer is not on the screen anymore. Why do we still try to leverage the Present extension support in Xwayland then? There are two important features of a Wayland compositor we want to have with Xwayland: A tear-free experience for the user and the ability to output a buffer rendered by a direct rendering client on a hardware plane without any copies in between. Every frame is perfect should also remain valid when using some legacy application and that we want no unnecessary copies is simply a question of performance improvements. This is especially important for many of the more demanding games out there, which won’t be Wayland native in the short term and some of them maybe never. Both features need the the full Present extension support in the Xwayland DDX. Without it a direct rendering application would still use the Present extension but only with its fallback code path of copying the Pixmap’s content. And for a tear-free experience we would at least need to sync these copies to the frame events sent by the Wayland compositor or better directly allow multiple buffers, otherwise we would limit our frame rate. In both cases this means again to increase the Present extension support.
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It Looks Like Intel Could Begin Pushing Graphics Tech More Seriously
It's been a while now since last seeing some major graphics advancements on Intel CPUs. With Skylake/Kabylake we are on "Gen 9" graphics, Kabylake-Refresh / Coffeelake is still Gen9 graphics, Broadwell was on Gen8, Haswell on Gen7.5, and IvyBridge on Gen 7. But with upcoming launches past Kabylake-Refresh/Coffeelake, it looks like we'll be stamping out Gen 10, Gen 11, and Gen 12.
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