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Utah GLX was a project aimed at creating a fullyfree and open-source basic hardware-accelerated3D renderer using theOpenGLrendering API onLinux kernel-based operating systems. Utah GLX predatesDirect Rendering Infrastructure, which is what is used as of 2014.

John Carmack worked on Utah GLX.^[1]

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  2D drivers inside of theX server
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  Indirect rendering overGLX, usingUtah GLX
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  EarlyDirect Rendering Infrastructure
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  Finally all access goes through theDirect Rendering Manager.
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  In Linux kernel 3.12render nodes were merged and theKMS driver was split off.Wayland implements direct rendering overEGL/GBM.

• Utah-GLX Homepage
• Historical view at OpenGL and Direct3D

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