Hands On Projects For The Linux Graphics Subsystem __exclusive__ -

gcc compositor.c -o tiny_compositor $(pkg-config --cflags --libs wlroots wayland-server) ./tiny_compositor Use code with caution.

libwayland-dev , libwlroots-dev (v0.16+), libxkbcommon , meson .

// Create dumb buffer (width, height, bpp) struct drm_mode_create_dumb dumb = .width = 640, .height = 480, .bpp = 32; drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &dumb); // Map it, fill with colors (e.g., red/blue gradient) // Add framebuffer: drmModeAddFB(fd, ...) // Set CRTC: drmModeSetCrtc(fd, crtc->crtc_id, fb_id, 0, 0, &conn->connector_id, 1, &conn->modes[0]); Hands On Projects For The Linux Graphics Subsystem

: Develop a tool to access and dump the PCI configuration space of your video card. This is essential for understanding how the kernel identifies and initializes graphics hardware.

: The kernel subsystem responsible for interfacing with GPUs, setting display resolutions (modeset), and managing framebuffers. gcc compositor

#define _POSIX_C_SOURCE 200112L #include #include #include #include #include #include struct tiny_server struct wl_display *wl_display; struct wlr_backend *backend; struct wlr_renderer *renderer; struct wlr_allocator *allocator; ; int main(int argc, char *argv[]) wlr_log_init(WLR_DEBUG, NULL); struct tiny_server server; // Create the display server server.wl_display = wl_display_create(); if (!server.wl_display) wlr_log(WLR_ERROR, "Unable to create Wayland display"); return 1; // Automatically detect the correct backend (DRM, X11, or Wayland nested) server.backend = wlr_backend_autocreate(server.wl_display, NULL); if (!server.backend) wlr_log(WLR_ERROR, "Unable to create wlroots backend"); return 1; Use code with caution. 2. Wiring Up the Engine

: Offers structured training materials and slides on the organization of the Linux graphics stack, covering both kernel and user-space. Foundational Concepts for Projects This is essential for understanding how the kernel

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.

Simulate a monitor unplug/replug and manually reinitialize the display pipeline using only sysfs and debugfs.

Focus on how different layers of the Linux graphics stack (Mesa, Wayland, X11) communicate.