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cs linux: graphics stack
add group theory. Rename application to docs vault.
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‎cs/linux/graphics.tex

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includeheadfoot
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\setcounter{secnumdepth}{0} % Disable section numbering
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\begin{filecontents}{linux-graphics-stack.bib}
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@misc{navlgs,
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author = {{Pengutronix}},
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title = {{ELCE 2022: Navigating the Linux Graphics Stack}},
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year = {2022},
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howpublished = {\url{https://youtu.be/WaF7mVhnhtE}},
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note = {Accessed: 2024-12-25}
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}
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\end{filecontents}
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\addbibresource{linux-graphics-stack.bib}
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\begin{document}
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\section{Linux Graphics Stack}
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\cite{navlgs}
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\subsection{Some Acronyms}
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\begin{verbatim}
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ls /sys/class/drm/card0-HDMI-A-1
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\end{verbatim}
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\begin{verbatim}
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ls /sys/kernel/debug/dri/0
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\end{verbatim}
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\begin{verbatim}
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echo 0x1ff > /sys/module/drm/parameters/debug
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\end{verbatim}
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\begin{itemize}
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\item Wayland
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\item DRI - Direct Rendering Infrastructure
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\item DRM - Direct Rendering Manager
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\item KMS - Kernel Mode Settings
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\item FB - Frame Buffer
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\item EGL
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\item OpenGL
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\end{itemize}
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\subsection{Topics}
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\begin{itemize}
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\item Pixel buffer onto display
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\item Draw pixel into a pixel buffer
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\item Compose multiple pixel buffers
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\end{itemize}
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\subsection{Display - Acronyms}
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\begin{itemize}
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\item DRI - Direct Rendering Infrastructure
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A framework in the X Window System that enables direct access to
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graphics hardware, allowing applications to perform rendering without
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the overhead of inter-process communication.
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\item DRM - Direct Rendering Manager
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A subsystem of the Linux kernel responsible for managing graphics
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processing units (GPUs), providing an API for user-space programs to
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perform operations like configuring display modes and rendering
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graphics.
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\item KMS - Kernel Mode Settings
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A component of the Direct Rendering Manager (DRM) that moves
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responsibility for display mode setting (such as resolution and color
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depth) from user space to the kernel, improving system stability and
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reducing flickering during mode changes.
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\item FB - Frame Buffer
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A portion of RAM containing a bitmap that drives a video display; in
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Linux, the framebuffer device provides a simple interface to graphics
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hardware, allowing applications to write directly to the display
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buffer.
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\end{itemize}
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\subsection{Display Stack}
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\subsection{Kernel Debugging}
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\begin{verbatim}
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ls /sys/class/drm/card0-HDMI-A-1
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\end{verbatim}
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\begin{verbatim}
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ls /sys/kernel/debug/dri/0
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\end{verbatim}
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\begin{verbatim}
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echo 0x1ff > /sys/module/drm/parameters/debug
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\end{verbatim}
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\subsection{GPU - Acronyms}
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\begin{itemize}
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\item OpenGL - Open Graphics Library
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A cross-platform API for rendering 2D and 3D vector graphics,
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facilitating hardware-accelerated rendering by interfacing with the GPU.
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\item GLSL - OpenGL Shading Language
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A high-level shading language with C-like syntax, enabling developers to
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write shaders for programmable stages of the graphics pipeline, such as
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vertex and fragment shaders
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\item EGL - Native Platform Graphics Interface API
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Provides an interface between OpenGL and the native windowing system
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for managing rendering surfaces.
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\end{itemize}
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In the Direct Rendering Manager (DRM) framework, only one application can hold
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the DRM master status at a time, granting it exclusive control over display
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resources.
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Traditional toolkits and applications often lack direct support for Kernel Mode
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Setting (KMS), making it challenging for multiple applications to manage display
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outputs concurrently.
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To address this limitation, a window compositor, such as Wayland, is employed.
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The compositor acts as the sole DRM master, managing access to display resources
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and facilitating the coordination of multiple applications' rendering requests.
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This architecture enables a more efficient and secure management of graphical
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resources, allowing applications to render content without requiring direct
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control over the display hardware.
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\newpage
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\printbibliography
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\end{document}

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