Utah GLX was a project aimed at creating a fully free and open-source basic hardware-accelerated 3D rendering 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 D. Carmack worked on Utah GLX.
2D drivers inside of the X server
Indirect rendering over GLX, using Utah GLX
Finally all access goes through the Direct Rendering Manager
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