R600g AMD Evergreen Geometry Shaders Proposed
Written by Michael Larabel in AMD on 30 January 2014 at 12:09 AM EST. 76 Comments
AMD
David Airlie at Red Hat has proposed OpenGL Geometry Shaders support for the R600g driver, but right now it only supports the Radeon HD 5000 "Evergreen" GPUs and newer.

While RadeonSI Gallium3D has OpenGL 3.3 support in mainline Mesa Git, the R600g driver that supports from Radeon HD 2000 through HD 6000 series GPUs does not. R600g right now officially only supports OpenGL 3.1 but there's been out-of-tree work towards OpenGL 3.3 compliance with this older open-source AMD Linux driver.

As the first work to hopefully be merged soon, David Airlie has proposed the R600g Geometry Shaders support. OpenGL GS is a requirement for supporting OpenGL 3.2 and is one of the major blockers in the path to OpenGL 3.3 support.

David wrote on the Mesa mailing list, "This series adds support for geometry shaders to r600g for evergreen and later GPUs. I don't think r600/r700 support is that hard, but I haven't had time to look at it at all, and I expect possible erratum. This passes most of the piglit tests on my BARTS board and doesn't hang the GPU anymore than normal piglit does."

Implementing Geometry Shaders for the Radeon HD 5000 amd 6000 series is spread across 25 patches to Mesa. The patches can be found via this Mesa-dev mailing list thread.
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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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