1 The code in this directory is the old mga_vid driver for Linux kernels
2 prior to 2.6. It does _not_ compile for version 2.6.x.
4 For Linux kernel 2.6.x please get the newest version of the 2.6 port from
5 http://attila.kinali.ch/mga/
8 mga_vid - MGA G200/G400 YUV Overlay kernel module
11 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>, Oct 1999
14 Fredrik Vraalsen <vraalsen@cs.uiuc.edu>
15 Alan Cox <alan@lxorguk.ukuu.org.uk>
19 This code messes with your video card and your X server. It will probably
20 lock up your box, format your hard drive, and cause your brand new G400
21 MAX to spout 6 inch flames. You have been warned.
25 What does this code do?
27 mga_vid is a kernel module that utilitizes the Matrox G200/G400/G550
28 video scaler/overlay unit to perform YUV->RGB colorspace conversion
29 and arbitrary video scaling.
31 mga_vid is also a monster hack.
33 How does mga_vid work?
35 This kernel module sets up the BES (backend scaler) with appropriate
36 values based on parameters supplied via ioctl. It also maps a chunk of
37 video memory into userspace via mmap. This memory is stolen from X
38 (which may decide to write to it later). The application can then write
39 image data directly to the framebuffer (if it knows the right padding,
43 How do I know if mga_vid works on my system?
45 There is a test application called mga_vid_test. This test code should
46 draw some nice 256x256 images for you if all is working well.