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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 xserver. 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 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 approriate 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 frame buffer (if it knows the right padding, etc).
How do I know if mga_vid works on my system?
There are test applications called mga_vid_test_g400 and mga_vid_test_g200.
Use the appropriate one for your card. This test code should draw some
nice 256x256 images for you if all is working well.
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