Raspberry Pi 4's Vulkan Driver and More
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Alejandro Piñeiro: v3dv status update 2020-07-01
Input attachment is one of the main sub-features for Vulkan multipass, and we’ve gained support since the announcement. On Vulkan the support for multipass is more tightly supported by the API. Renderpasses can have multiple subpasses. These can have dependencies between each other, and each subpass define a subset of “attachments”. One attachment that is easy to understand is the color attachment: This is where a given subpass writes a given color. Another, input attachment, is an attachment that was updated in a previous subpass (for example, it was the color attachment on such previous subpass), and you get as a input on following subpasses. From the shader POV, you interact with it as a texture, with some restrictions. One important restriction is that you can only read the input attachment at the current pixel location. The main reason for this restriction is because on tile-based GPUs (like rpi4) all primitives are batched on tiles and fragment processing is rendered one tile at a time. In general, if you can live with those restrictions, Vulkan multipass and input attachment will provide better performance than traditional multipass solutions.
If you are interested in reading more details on this, you can check out ARM’s very nice presentation “Vulkan Multipass mobile deferred done right”, or Sascha Willems’ post “Vulkan input attachments and sub passes”. The latter also includes information about how to use them and code snippets of one of his demos. For reference, this is how the input attachment demos looks on the rpi4...
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Raspberry Pi 4's Vulkan Driver Is Now More Usable - Supporting More Features
The "V3DV" Vulkan driver being developed by Igalia under contract with the Raspberry Pi Foundation has offered a status update on this official driver for the Raspberry Pi 4.
The V3DV effort is the modern, official Vulkan driver for the Raspberry Pi 4 and not to be confused with the third-party Vulkan driver for pre-RPi4 hardware or the former Raspberry Pi 4 Vulkan effort. This is the new driver being developed and what ultimately will be the official driver option moving forward.
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