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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 <aholtzma@ess.engr.uvic.ca>, Oct 1999
Contributions by:
Fredrik Vraalsen <vraalsen@cs.uiuc.edu>
Alan Cox <alan@lxorguk.ukuu.org.uk>
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.
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