OpenGL Transform Feedback For LLVMpipe
Written by Michael Larabel in Mesa on 5 December 2012 at 01:49 PM EST. 5 Comments
An initial patch for review has been published by David Airlie that implements OpenGL Transform Feedback support for the LLVMpipe driver.

The LLVMpipe Gallium3D software-based driver hasn't reached OpenGL 3.0 compliance yet but it's slowly getting there. LLVMpipe is now in the process of picking up EXT_transform_feedback support.

OpenGL Transform Feedback adds in the capability of altering the rendering pipeline to allow for primitives processed by Vertex/Geometry Shaders to be written to buffer objects. By writing it to buffer objects, the post-transform render state of an object can be saved so that it can be re-submitted multiple times.

Transform Feedback was added to the core OpenGL specification in OpenGL 3.0 and it remains as of the latest OpenGL 4.3 specification with EXT_transform_feedback. Many of the other open-source Mesa/Gallium3D drivers have had GL3 transform feedback support for several months.

David mentioned when publishing the initial patch that the LLVMpipe EXT_transform_feedback support is currently passing 115 of 130 Piglit tests.
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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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