--- Linus Torvalds <[EMAIL PROTECTED]> wrote: > > On Wed, 26 Feb 2003, Sven Luther wrote: > > > > Yes, and you have to divide the fb memory in two, one for each > head, or > > something such, and each head will have its separate offscreen > memory > > manager, possibly using different screen strides. > > Side note: I know that what people are mostly talking about is having > two > separate displays with different contents, but please, if you're > thinking > about this, try to make the solution generic enough that you can have > two > separate displays with the _same_ backing store content at different > resolutions and different pointers. > > Yeah, not all chips support this, but many do (and probably all that > support multiview support this subset), and it's invaluable for > having > laptops that have small LCD's. In particular, it should be possible > to > have the pointer associated with the LCD, and scroll around on the > LCD > while the CRT output (ie usually a projector) shows the whole picture > (obviously without scrolling or without any pointer). > > Right now, as far as I can tell, XFree86 can not do this sanely. You > can > have two separate X servers for the different outputs, or you can > have the > exact _same_ output on both CRT controllers, but you can't make the > two > displays look like "separate windows into the same area". > > And it really sounds like the DRI dual-head is not that conceptually > different from this. The only issue is whether you share the frame > buffer > or not. > > So you have several cases: > - shared framebuffer, shared CRT control > - shared framebuffer, but separate CRT control (and "mouse focus" or > > whatnot) > - separate framebuffers, and separate CRT control (and "mouse > focus") > > Is this what you call "mirrored viewports"? > > Linus >
I think we are all talking about the same thing. What you described above might be covered by the "zoomed" mode (you could zoom in or out), which is kind of a subset of the mirrored mode. In that case the second crtc would be a viewport into the same framebuffer, only with a different resolution. I agree that Xfree doesn't really have a good interface for this at the moment. it tends to be too entity specific. Alex __________________________________________________ Do you Yahoo!? Yahoo! Tax Center - forms, calculators, tips, more http://taxes.yahoo.com/ ------------------------------------------------------- This SF.net email is sponsored by: Scholarships for Techies! Can't afford IT training? All 2003 ictp students receive scholarships. Get hands-on training in Microsoft, Cisco, Sun, Linux/UNIX, and more. www.ictp.com/training/sourceforge.asp _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
