mirror of
https://github.com/mpv-player/mpv
synced 2024-10-30 04:46:41 +01:00
41 lines
1.3 KiB
Plaintext
41 lines
1.3 KiB
Plaintext
|
|
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.
|