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Another OpenGL 4 Feature For Mesa Is Published

Mesa

Published on 31 March 2013 12:49 PM EDT
Written by Michael Larabel in Mesa
1 Comment

Earlier this morning I wrote about Chris Forbes committing texture storage multi-sample support to mainline Mesa and the Intel DRI driver. This OpenGL 4.x extension is now accompanied by a new "RFC" patch-set for providing Mesa support for another GL4 feature.

Chris Forbes' newly-published patches on Sunday morning are for ARB_texture_gather, a feature mandated by OpenGL 4.0 and previously not tackled within the Mesa/Gallium3D world.

As explained by the registry specification, "This extension provides 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."

Forbes explains at the beginning of his new patch-set on the mailing list, "This series implements ARB_texture_gather in core mesa, and the driver side for Gen7 i965. Not quite baked -- green/blue/alpha texture swizzles with VS don't work yet. Everything else works, though (R/0/1 swizzles in VS; all swizzles in FS; textureGather and textureGatherOffset). The first two patches are pretty much what Maxence sent out, but tidied up so they work; the third patch of that original series (st + softpipe) is dropped for now, but shouldn't be hard to reinclude."

About The Author
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 and or contacted via .
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