Understand DRM driver internals by writing a minimal virtual DRM driver (as a kernel module).
Execute drmModeSetCrtc to force the hardware to scan out from your memory buffer. Core C Implementation Save the following source code as kms_flip.c :
This set of projects guides you from basic framebuffer manipulation to understanding DRM (Direct Rendering Manager), KMS (Kernel Mode Setting), and GPU acceleration. Each project includes a clear goal, key concepts, and expected outcomes.
: Controllers that read data out of scan-out memory and feed it to encoders. Hands On Projects For The Linux Graphics Subsystem
Create a window on the screen using raw X11 calls (Xlib or XCB) without using GTK or Qt. Why: This teaches you the absolute basics of how the X Window System protocol works regarding drawing primitives and event handling.
In this project, we'll contribute to the Linux graphics community by fixing a bug or adding a new feature to an open-source graphics driver. This project will help you understand how to contribute to the Linux graphics community and work with other developers.
The component responsible for configuring screen resolutions, color depths, and refresh rates. It handles the hardware pipeline from memory to the physical screen. Understand DRM driver internals by writing a minimal
: OpenGL is cross‑platform and has a gentle learning curve. Start with the classic "Hello Triangle" example to understand shaders, buffers, and the rendering pipeline. The interactive tutorial LearnOpenGL provides an excellent modern OpenGL tutorial for Linux systems using GLFW and GLAD. Build up to textured objects, lighting, and simple user interaction. Using the framebuffer objects (FBOs) allows you to render to textures that can be passed to a compositor.
: Inside your output frame event, clear the screen, iterate through active XDG surfaces, and call wlr_render_texture() to composite client windows onto the screen canvas. Key Takeaway
The user-space library translating standard APIs like OpenGL and Vulkan into hardware-specific token streams for DRM drivers. Project 1: Low-Level Framebuffer Pixel Manipulation Each project includes a clear goal, key concepts,
The Linux graphics subsystem is a sophisticated, layered system where applications generate pixels that eventually light up the screen via the Direct Rendering Manager (DRM) and Kernel Mode Setting (KMS). While this stack—spanning userspace APIs, user-mode drivers, and the kernel's DRM/KMS—may initially appear complex, hands-on projects are the most effective way to understand how these layers interconnect. This guide provides a structured pathway from simple framebuffer experiments to building a custom Wayland compositor, designed for developers, students, and enthusiasts seeking to master the graphics landscape.
Draw pixels, lines, and simple shapes directly on the Linux framebuffer device ( /dev/fb0 ).
Query the DRM resources to find an active Connector (the physical port) and an available CRTC (the display controller scan-out engine).
Contributing to the Linux graphics community is a great way to give back to the community and improve your skills.
: Understanding the PCI configuration space , video memory address regions, and how the kernel scans out a frame buffer to the hardware. 2. Implementing a Minimal Wayland Compositor
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