Transform Feedback, OpenGL 3.0 Ready For RadeonSI
Written by Michael Larabel in AMD on 3 September 2013 at 08:52 PM EDT. 9 Comments
The AMD "RadeonSI" Gallium3D driver for Radeon HD 7000/8000 series hardware support by the open-source Linux graphics driver is about to support OpenGL 3.0. While the hardware is capable of OpenGL 4.4, the open-source RadeonSI driver has only advertised OpenGL 2.1 compliance.

Preventing the RadeonSI driver from advertising OpenGL 3.0 (or greater) like the R600, Intel, and Nouveau drivers has been its lack of transform feedback support. As described via the OpenGL.org Wiki, "Transform Feedback is the process of capturing Primitives generated by the Vertex Processing step(s), recording data from those primitives into Buffer Objects. This allows one to preserve the post-transform rendering state of an object and resubmit this data multiple times."

Marek Olšák submitted a set of 11 patches to the Mesa-dev list on Tuesday that implements transform feedback for RadeonSI and also enables OpenGL 3.0 support, since it was the last remaining feature.

These 11 patches also depend though on a Radeon GPU LLVM patch, which will end up being released with LLVM 3.4 likely by the end of the year. So if you'll want GL3+ support on RadeonSI, you're going to either need to be pulling the LLVM development tree for the latest support or wait until 2014.
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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.

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