Mesa Finally Lands GL4 ARB Texture Gather Support
Written by Michael Larabel in Mesa on 2 October 2013 at 03:57 PM EDT. 3 Comments
With a series of commits today, Mesa finally has support for the ARB_texture_gather extension as is needed for OpenGL 4.0 compliance.

Mesa patches for ARB_texture_gather have been floating around on Mesa development channels for many months, but only today was the full support committed to Mesa master. ARB_texture_gather is a requirement of OpenGL 4.0 compliance and is described by the OpenGL.org registry as "a new set of texture functions (textureGather) to the shading language that determine 2x2 footprint that are used for linear filtering in a texture lookup, and return a vector consisting of the first component from each of the four texels in the footprint."

The ARB_texture_gather support affects various areas of Mesa and spanned several commits including changes for GLSL, core Mesa, and the individual drivers. ARB_texture_gather in Mesa today only is supported by the Intel i965 DRI driver and for there only found with Ivy Bridge and Haswell processors. Support for the other drivers (namely Radeon and Nouveau) will come in due time.
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Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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