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Adding secondary command buffers to PanVk

Submitted by Roy Schestowitz on Wednesday 15th of June 2022 09:09:18 PM Filed under
Development
Graphics/Benchmarks
Linux

For those who don't know yet, Panfrost is the open source OpenGL driver for the ARM Mali Midgard, Bifrost (and soon Valhall) GPU series. This driver is in a pretty good state already (see the conformance status here). On the other hand, we have PanVk, the open source Vulkan driver), and as can be guessed from the PAN_I_WANT_A_BROKEN_VULKAN_DRIVER=1 environment variable that is needed to have it loaded properly, it is still in its early days.

My internship, which started in December 2021 and wrapped up recently, was about getting PanVk closer to conformancy by implementing one of the core Vulkan features: support for secondary command buffers.

But before we dive into implementation details, let's take a step back to explain what command buffers are, why Vulkan introduced this concept, and what makes secondary command buffers different from the primary counterpart.
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