R600 Gallium3D Expands On Stream-Out By Default
Written by Michael Larabel in AMD on 19 June 2012 at 03:12 PM EDT. 6 Comments
The R600 Gallium3D driver is beginning to enable Stream-Out support by default for a greater selection of the Radeon graphics processors.

Since this past weekend in Mesa Git master, which will eventually become Mesa 8.1, R600 Stream-Out is on by default for R7XX GPUs. This is for the Radeon HD 4000 series and it also requires DRM 2.17, which basically comes down to running the very latest Linux kernel (3.5).

For the Evergreen (Radeon HD 5000 series) and R600 (Radeon HD 2000/3000 series) the Stream-Out support has been enabled by default already. Just missing from action now is the Radeon HD 6000 series with the Northern Islands and Cayman GPUs, then of course the Radeon HD 7000 series support too whenever that new driver is finally into shape. The HD 6000 series support can be toggled easily at this time via the R600_STREAMOUT environment variable.

Stream-Out support has been available in the the Radeon DRM driver for months but all of the issues are only now being worked out. Gallium3D has had Stream Out support for since last year. Stream-Out is what enables OpenGL transform feedback support. Stream-Out provides support for storing primitives in a buffer with the data being output directly from a Geometry/Vertex Shader before the rasterization stage

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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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