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Transform Feedback, OpenGL 3.0 Ready For RadeonSI

AMD

Published on 03 September 2013 08:52 PM EDT
Written by Michael Larabel in AMD
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.

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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