Add libinput to read mouse events and move a rectangle around the screen. Congratulations, you just wrote a micro-compositor.
I hope this helps! Let me know if you'd like me to expand on any of these sections.
: Read the pixels out of GPU memory back into a system RAM array using glReadPixels() , then serialize the raw data into a PNG or JPEG file on disk. Hands On Projects For The Linux Graphics Subsystem
Open a file descriptor pointing to a primary DRM node, typically located at /dev/dri/card0 .
On a Debian or Ubuntu-based system, install the development headers and libraries: Add libinput to read mouse events and move
These projects are designed to help you get hands-on with the core kernel interfaces. They require a Linux environment with root access.
This project bypasses X11, Wayland, and all high-level UI toolkits. You will write a C program that opens the DRM device, configures a display mode, allocates a dumb framebuffer, and draws pixels directly to the screen. Step 1: Open the DRM Device and Acquire Master Privileges Let me know if you'd like me to
Wayland compositors (Gnome's Mutter, KDE's KWin) are massive. This strips them to the bone.
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
: Memory allocations inside the GPU that can be mapped to user space for simple, unaccelerated 2D rendering. Step-by-Step Implementation