Utah GLX
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Utah GLX was a project aimed at creating a fully free and open-source basic hardware-accelerated 3D renderer using the OpenGL rendering API on Linux kernel-based operating systems. Utah GLX predates Direct Rendering Infrastructure, which is what is used as of 2014.

John Carmack worked on Utah GLX.[1]
History
- 2D drivers inside of the X server
- Indirect rendering over GLX, using Utah GLX
- Finally all access goes through the Direct Rendering Manager.
- In Linux kernel 3.12 render nodes were merged and the KMS driver was split off. Wayland implements direct rendering over EGL/GBM.