Bind your dumb buffer allocation to a DRM framebuffer ID using drmModeAddFB .
Write a Bash script that triggers a GPU memory dump using devmem2 to read the GPU's MMIO region and extract the framebuffer address.
Understand how the kernel identifies and communicates with graphics hardware. Hands On Projects For The Linux Graphics Subsystem
: Create an off-screen pixel buffer surface using eglCreatePbufferSurface() . This lets you render to memory without requiring an open display window.
Locate specific coordinates using the formula: Bind your dumb buffer allocation to a DRM
Map the file descriptor of /dev/fb0 into memory. This links a pointer in your C program directly to the video card's display memory.
// Conceptual initialization flow for headless EGL EGLDisplay egl_dpy = eglGetPlatformDisplay(EGL_PLATFORM_SURFACELESS_MESA, EGL_DEFAULT_DISPLAY, NULL); eglInitialize(egl_dpy, &major, &minor); EGLint ctx_attribs[] = EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE ; EGLContext egl_ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, ctx_attribs); eglMakeCurrent(egl_dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, egl_ctx); Use code with caution. Key Takeaway : Create an off-screen pixel buffer surface using
Implement a simple, software-rendered Vulkan driver for the virtio-gpu device using the open-source Lavapipe as a base, but modified to submit actual command buffers to a virtual ring.