The code in this directory is the old mga_vid driver for Linux kernels prior to 2.6. It does _not_ compile for version 2.6.x. For Linux kernel 2.6.x please get the newest version of the 2.6 port from http://attila.kinali.ch/mga/ mga_vid - MGA G200/G400 YUV Overlay kernel module Author: Aaron Holtzman , Oct 1999 Contributions by: Fredrik Vraalsen Alan Cox WARNING ----- WARNING This code messes with your video card and your X server. It will probably lock up your box, format your hard drive, and cause your brand new G400 MAX to spout 6 inch flames. You have been warned. WARNING ----- WARNING What does this code do? mga_vid is a kernel module that utilitizes the Matrox G200/G400/G550 video scaler/overlay unit to perform YUV->RGB colorspace conversion and arbitrary video scaling. mga_vid is also a monster hack. How does mga_vid work? This kernel module sets up the BES (backend scaler) with appropriate values based on parameters supplied via ioctl. It also maps a chunk of video memory into userspace via mmap. This memory is stolen from X (which may decide to write to it later). The application can then write image data directly to the framebuffer (if it knows the right padding, etc). How do I know if mga_vid works on my system? There is a test application called mga_vid_test. This test code should draw some nice 256x256 images for you if all is working well.