GL_EXT_semaphore Being Prepped For Mesa, Used By SteamVR
Written by Michael Larabel in Mesa on 2 November 2017 at 05:17 AM EDT. 2 Comments
Andres Rodriguez of Valve has posted a set of 17 patches for implementing the OpenGL GL_EXT_semaphore extension within Mesa and wired through for RadeonSI.

GL_EXT_semaphore is part of the OpenGL memory object support that was introduced as an extension this year for porting these semaphores / memory objects concepts from Vulkan back to OpenGL. Semaphores are synchronization primitives and the GL semaphores map to the semantics of Vulkan semaphores.

Valve is using the EXT_semaphore extension by their SteamVR client to synchronize access to shared surfaces between Vulkan and OpenGL.

The set of 17 patches and thousand new lines of code to be added to Mesa can be found via Mesa-dev.

Meanwhile, NVIDIA's Linux driver has already supported OpenGL memory objects and semaphores since back in June.
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Michael Larabel is the principal author of 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 automated benchmarking software. He can be followed via Twitter or contacted via

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