16-bit Support Being Worked On For Intel ANV, Gallium3D TGSI
Written by Michael Larabel in Mesa on 24 August 2017 at 02:12 PM EDT. 1 Comment
MESA --
16-bit "half-float" support is a popular topic among Mesa developers in recent days.

Marek Olšák of AMD has proposed adding TGSI 16-bit support, with TGSI being the intermediate representation (IR) used by Gallium3D. That's evolved into a lengthy discussion by upstream developers for supporting 16-bit floats and integers within TGSI. No patches yet, but that will probably be coming soon.

Meanwhile, Alejandro Piñeiro of Igalia has pushed his latest patches for supporting Vulkan's 16-bit extensions in the Intel ANV driver. Those extensions are VK_KHR_16bit_storage for Vulkan and the associated SPV_KHR_16bit_storage extension in SPIR-V. These extensions will work with Intel Broadwell "Gen 8" graphics hardware and newer. The Intel ANV 16-bit support comes in at 47 patches at just over one thousand new lines of code.

VK_KHR_16bit_storage was introduced this summer with Vulkan 1.0.54 and this half-float push is partially driven by lessening memory bandwidth requirements if not needing 32-bit or 64-bit precision/range.
About The Author
Author picture

Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

Related Mesa News
Popular News