How to write a Driver for a Video card
I want to write a driver for ATI (Radeon) video card (I have an ATI Radeon 9600) but I don't know what information I need and how other video card drivers (nvidia, vga) are implemented.
Are you using video card bios or are you directly sending data to the memory of the video card ?
Do you know a good source of information to write this kind of driver ? I saw the ATI web but can't find anything else than binary drivers for other OS.