OpenGL 4.5 Compat Being Worked On For RadeonSI, Helping Out No Man's Sky & Others
Written by Michael Larabel in Radeon on 4 July 2018 at 05:43 AM EDT. 9 Comments
RADEON --
What does Valve's Linux GPU driver developer Timothy Arceri do now that he took the RadeonSI Gallium3D driver up to OpenGL 4.4 in its compatibility profile mode? Work on OpenGL 4.5 compatibility profile support, of course.

While the recent effort from taking the OpenGL compatibility profile mode in RadeonSI from OpenGL 3.1 to OpenGL 4.4 means a great deal of more games/applications are now working with this open-source Radeon GCN OpenGL driver, Arceri is working on OpenGL 4.5 support for this context that allows deprecated OpenGL features to still be mixed in with newer versions of OpenGL.

Hitting the OpenGL 4.5 compatibility profile support isn't going to be a trivial task as there are some big enablers left like getting OpenGL Direct State Access (DSA) working in this mode. Arceri already commented that seeing that support is unlikely before the Mesa 18.2 branching in late July.

But for a temporary measure at least, he sent out a patch loosely enabling it when forcing the OpenGL 4.5 compatibility mode. With the patch and setting the MESA_GL_VERSION_OVERRIDE=4.5COMPAT environment variable is good enough to make some software happy.

One game helped out by this override is using the game No Man's Sky under Wine, but others are also apparently helped based on the aforelinked mailing list post.

Mesa 18.2 is expected to be branching around 20 July while the official release of this quarterly feature update will likely be around mid-August.

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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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