Components
The DRI OpenGL support consists of several pieces:
- The Direct Rendering Manager (DRM) is a combination of at least two kernel modules, one of core DRM code and others providing APIs to userland to access different classes of video hardware.
- The userland driver module contains an OpenGL driver that typically prepares buffers of commands to be sent to the hardware by the DRM and interacts with the windowing system for synchronization of access to the hardware.
- Additional code provides access to the interface provided by the driver module. In X this is the libdri.so support module and a DRI-enabled DDX (2D driver). In the framebuffer implementation this is MiniGLX, which initializes the DRM and provides some X APIs to the userland driver despite the lack of an X Server.
Read more about this topic: Direct Rendering Infrastructure
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