EXA pixmap alignments.
eta at lclark.edu
Mon Sep 26 12:20:54 PDT 2005
On Mon, 2005-09-26 at 09:55 +0200, Thomas Hellstrom wrote:
> EXADriverPtr->card.pixmapOffsetAlign = ?
> EXADriverPtr->card.pixmapPitchAlign = ?
> Is there a chance to have the above parameters defined also for system
> to frame-buffer transfers?
> For example Unichrome / Unichrome Pro currently requires both to be 16
> for PCI DMA to work, and as briefly discussed on the dri-devel list,
> system / frame-buffer bounce buffers to fix alignments may be very
I'm not quite clear on what you're asking about -- you said something
about dst_addr%4 == src_addr%4. EXA doesn't have anything to help you
with that -- it can only ensure that the offset in card space is aligned
to a multiple of some number, and/or the pitch of the pixmap is aligned
to some number. However, simply having the on-card offset aligned to 16
and then doing a fixup on the system memory buffer (if necessary, which
it usually wouldn't be, I bet) after copying out seems reasonable to me.
Eric Anholt eta at lclark.edu
http://people.freebsd.org/~anholt/ anholt at FreeBSD.org
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