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
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