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Sandy Bridge Gets Layered Rendering, Fixes Longtime Regression

Intel

Published on 29 May 2014 05:19 PM EDT
Written by Michael Larabel in Intel
7 Comments

While improvements to Intel's open-source Linux graphics driver that explicitly target Sandy Bridge hardware is rare these days with the Intel OTC crew being busy with Broadwell, Haswell, and Bay Trail, there is an SNB improvement to report this afternoon. A patch-set has emerged for Sandy Bridge to implement layered rendering and in the process it takes care of a long-time OpenGL performance regression.

Jordan Justen of Intel published sixteen patches of "Gen6" render surface state changes to allow layered rendering to work for Sandy Bridge. These patches also fix 10 Piglit tests plus FreeDesktop.org Bug 56127, a report that was opened in late 2012. Back in October of 2012 a regression of the Unigine Sanctuary performance being reduced by 98% and Nexuiz was reported. The issue was bisected and back in 2013 it was attributed that Jordan's layered rendering work should fix the problem.

Jordan's patches for this Sandy Bridge improvement are now under a "request for comments" on the Mesa mailing list. Hopefully this work will be merged for Mesa 10.3 when released in about three months time.

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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