Around 12 o'clock on Sep 19, Jon Smirl wrote: > This is going to require some more thought. Mode setting needs two > things, a description of the mode timings and a location of the scan > out buffer. With multiple heads you can't just assume that the buffer > starts at zero. There also the problem of the buffer increasing in > size and needing to be moved since it won't fit where it is. > > Keith, how should this work for X?
I just need to know where the frame buffer lives; it can move or change pitch at any time. I can even deal with the frame buffer moving without warning if necessary. What I can't handle is off-screen memory suddenly disappearing on me; I need to be able to pull any off-screen data back to main memory before things get shuffled around. This, of course, is related rather strongly with any memory management system, for which I'd like to have applications allocate main-memory space for any off-screen resources so that the kernel can pull things off the video card without needing cooperation from the X server at switch time. -keith
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