In computing, the Direct Rendering Infrastructure (DRI) is an interface and a free software implementation used in the X Window System to securely allow user applications to access the video hardware without requiring data to be passed through the X server. Its primary application is to provide hardware acceleration for the Mesa implementation of OpenGL. Without DRI, programs have to use the CPU while rendering (indirect rendering), which degrades overall performance. DRI has also been adapted to provide OpenGL acceleration on a framebuffer console without an X Server running.
Read more about Direct Rendering Infrastructure: History, Components, Drivers, DRI2
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