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Diffstat (limited to 'drivers/README')
| -rw-r--r-- | drivers/README | 40 |
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diff --git a/drivers/README b/drivers/README new file mode 100644 index 0000000000..bea354f489 --- /dev/null +++ b/drivers/README @@ -0,0 +1,40 @@ + +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. |